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jshint.js 1.2 MB

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  1. /*! 2.13.2 */
  2. var JSHINT;
  3. if (typeof window === 'undefined') window = {};
  4. (function () {
  5. var require;
  6. require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
  7. var identifierStartTable = [];
  8. for (var i = 0; i < 128; i++) {
  9. identifierStartTable[i] =
  10. i === 36 || // $
  11. i >= 65 && i <= 90 || // A-Z
  12. i === 95 || // _
  13. i >= 97 && i <= 122; // a-z
  14. }
  15. var identifierPartTable = [];
  16. for (var i = 0; i < 128; i++) {
  17. identifierPartTable[i] =
  18. identifierStartTable[i] || // $, _, A-Z, a-z
  19. i >= 48 && i <= 57; // 0-9
  20. }
  21. module.exports = {
  22. asciiIdentifierStartTable: identifierStartTable,
  23. asciiIdentifierPartTable: identifierPartTable
  24. };
  25. },{}],2:[function(require,module,exports){
  26. module.exports = 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  27. },{}],3:[function(require,module,exports){
  28. var str = 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  29. var arr = str.split(',').map(function(code) {
  30. return parseInt(code, 10);
  31. });
  32. module.exports = arr;
  33. },{}],4:[function(require,module,exports){
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  35. var arr = str.split(',').map(function(code) {
  36. return parseInt(code, 10);
  37. });
  38. module.exports = arr;
  39. },{}],5:[function(require,module,exports){
  40. // http://wiki.commonjs.org/wiki/Unit_Testing/1.0
  41. //
  42. // THIS IS NOT TESTED NOR LIKELY TO WORK OUTSIDE V8!
  43. //
  44. // Originally from narwhal.js (http://narwhaljs.org)
  45. // Copyright (c) 2009 Thomas Robinson <280north.com>
  46. //
  47. // Permission is hereby granted, free of charge, to any person obtaining a copy
  48. // of this software and associated documentation files (the 'Software'), to
  49. // deal in the Software without restriction, including without limitation the
  50. // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  51. // sell copies of the Software, and to permit persons to whom the Software is
  52. // furnished to do so, subject to the following conditions:
  53. //
  54. // The above copyright notice and this permission notice shall be included in
  55. // all copies or substantial portions of the Software.
  56. //
  57. // THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  58. // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  59. // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  60. // AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  61. // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  62. // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  63. // when used in node, this will actually load the util module we depend on
  64. // versus loading the builtin util module as happens otherwise
  65. // this is a bug in node module loading as far as I am concerned
  66. var util = require('util/');
  67. var pSlice = Array.prototype.slice;
  68. var hasOwn = Object.prototype.hasOwnProperty;
  69. // 1. The assert module provides functions that throw
  70. // AssertionError's when particular conditions are not met. The
  71. // assert module must conform to the following interface.
  72. var assert = module.exports = ok;
  73. // 2. The AssertionError is defined in assert.
  74. // new assert.AssertionError({ message: message,
  75. // actual: actual,
  76. // expected: expected })
  77. assert.AssertionError = function AssertionError(options) {
  78. this.name = 'AssertionError';
  79. this.actual = options.actual;
  80. this.expected = options.expected;
  81. this.operator = options.operator;
  82. if (options.message) {
  83. this.message = options.message;
  84. this.generatedMessage = false;
  85. } else {
  86. this.message = getMessage(this);
  87. this.generatedMessage = true;
  88. }
  89. var stackStartFunction = options.stackStartFunction || fail;
  90. if (Error.captureStackTrace) {
  91. Error.captureStackTrace(this, stackStartFunction);
  92. }
  93. else {
  94. // non v8 browsers so we can have a stacktrace
  95. var err = new Error();
  96. if (err.stack) {
  97. var out = err.stack;
  98. // try to strip useless frames
  99. var fn_name = stackStartFunction.name;
  100. var idx = out.indexOf('\n' + fn_name);
  101. if (idx >= 0) {
  102. // once we have located the function frame
  103. // we need to strip out everything before it (and its line)
  104. var next_line = out.indexOf('\n', idx + 1);
  105. out = out.substring(next_line + 1);
  106. }
  107. this.stack = out;
  108. }
  109. }
  110. };
  111. // assert.AssertionError instanceof Error
  112. util.inherits(assert.AssertionError, Error);
  113. function replacer(key, value) {
  114. if (util.isUndefined(value)) {
  115. return '' + value;
  116. }
  117. if (util.isNumber(value) && !isFinite(value)) {
  118. return value.toString();
  119. }
  120. if (util.isFunction(value) || util.isRegExp(value)) {
  121. return value.toString();
  122. }
  123. return value;
  124. }
  125. function truncate(s, n) {
  126. if (util.isString(s)) {
  127. return s.length < n ? s : s.slice(0, n);
  128. } else {
  129. return s;
  130. }
  131. }
  132. function getMessage(self) {
  133. return truncate(JSON.stringify(self.actual, replacer), 128) + ' ' +
  134. self.operator + ' ' +
  135. truncate(JSON.stringify(self.expected, replacer), 128);
  136. }
  137. // At present only the three keys mentioned above are used and
  138. // understood by the spec. Implementations or sub modules can pass
  139. // other keys to the AssertionError's constructor - they will be
  140. // ignored.
  141. // 3. All of the following functions must throw an AssertionError
  142. // when a corresponding condition is not met, with a message that
  143. // may be undefined if not provided. All assertion methods provide
  144. // both the actual and expected values to the assertion error for
  145. // display purposes.
  146. function fail(actual, expected, message, operator, stackStartFunction) {
  147. throw new assert.AssertionError({
  148. message: message,
  149. actual: actual,
  150. expected: expected,
  151. operator: operator,
  152. stackStartFunction: stackStartFunction
  153. });
  154. }
  155. // EXTENSION! allows for well behaved errors defined elsewhere.
  156. assert.fail = fail;
  157. // 4. Pure assertion tests whether a value is truthy, as determined
  158. // by !!guard.
  159. // assert.ok(guard, message_opt);
  160. // This statement is equivalent to assert.equal(true, !!guard,
  161. // message_opt);. To test strictly for the value true, use
  162. // assert.strictEqual(true, guard, message_opt);.
  163. function ok(value, message) {
  164. if (!value) fail(value, true, message, '==', assert.ok);
  165. }
  166. assert.ok = ok;
  167. // 5. The equality assertion tests shallow, coercive equality with
  168. // ==.
  169. // assert.equal(actual, expected, message_opt);
  170. assert.equal = function equal(actual, expected, message) {
  171. if (actual != expected) fail(actual, expected, message, '==', assert.equal);
  172. };
  173. // 6. The non-equality assertion tests for whether two objects are not equal
  174. // with != assert.notEqual(actual, expected, message_opt);
  175. assert.notEqual = function notEqual(actual, expected, message) {
  176. if (actual == expected) {
  177. fail(actual, expected, message, '!=', assert.notEqual);
  178. }
  179. };
  180. // 7. The equivalence assertion tests a deep equality relation.
  181. // assert.deepEqual(actual, expected, message_opt);
  182. assert.deepEqual = function deepEqual(actual, expected, message) {
  183. if (!_deepEqual(actual, expected)) {
  184. fail(actual, expected, message, 'deepEqual', assert.deepEqual);
  185. }
  186. };
  187. function _deepEqual(actual, expected) {
  188. // 7.1. All identical values are equivalent, as determined by ===.
  189. if (actual === expected) {
  190. return true;
  191. } else if (util.isBuffer(actual) && util.isBuffer(expected)) {
  192. if (actual.length != expected.length) return false;
  193. for (var i = 0; i < actual.length; i++) {
  194. if (actual[i] !== expected[i]) return false;
  195. }
  196. return true;
  197. // 7.2. If the expected value is a Date object, the actual value is
  198. // equivalent if it is also a Date object that refers to the same time.
  199. } else if (util.isDate(actual) && util.isDate(expected)) {
  200. return actual.getTime() === expected.getTime();
  201. // 7.3 If the expected value is a RegExp object, the actual value is
  202. // equivalent if it is also a RegExp object with the same source and
  203. // properties (`global`, `multiline`, `lastIndex`, `ignoreCase`).
  204. } else if (util.isRegExp(actual) && util.isRegExp(expected)) {
  205. return actual.source === expected.source &&
  206. actual.global === expected.global &&
  207. actual.multiline === expected.multiline &&
  208. actual.lastIndex === expected.lastIndex &&
  209. actual.ignoreCase === expected.ignoreCase;
  210. // 7.4. Other pairs that do not both pass typeof value == 'object',
  211. // equivalence is determined by ==.
  212. } else if (!util.isObject(actual) && !util.isObject(expected)) {
  213. return actual == expected;
  214. // 7.5 For all other Object pairs, including Array objects, equivalence is
  215. // determined by having the same number of owned properties (as verified
  216. // with Object.prototype.hasOwnProperty.call), the same set of keys
  217. // (although not necessarily the same order), equivalent values for every
  218. // corresponding key, and an identical 'prototype' property. Note: this
  219. // accounts for both named and indexed properties on Arrays.
  220. } else {
  221. return objEquiv(actual, expected);
  222. }
  223. }
  224. function isArguments(object) {
  225. return Object.prototype.toString.call(object) == '[object Arguments]';
  226. }
  227. function objEquiv(a, b) {
  228. if (util.isNullOrUndefined(a) || util.isNullOrUndefined(b))
  229. return false;
  230. // an identical 'prototype' property.
  231. if (a.prototype !== b.prototype) return false;
  232. // if one is a primitive, the other must be same
  233. if (util.isPrimitive(a) || util.isPrimitive(b)) {
  234. return a === b;
  235. }
  236. var aIsArgs = isArguments(a),
  237. bIsArgs = isArguments(b);
  238. if ((aIsArgs && !bIsArgs) || (!aIsArgs && bIsArgs))
  239. return false;
  240. if (aIsArgs) {
  241. a = pSlice.call(a);
  242. b = pSlice.call(b);
  243. return _deepEqual(a, b);
  244. }
  245. var ka = objectKeys(a),
  246. kb = objectKeys(b),
  247. key, i;
  248. // having the same number of owned properties (keys incorporates
  249. // hasOwnProperty)
  250. if (ka.length != kb.length)
  251. return false;
  252. //the same set of keys (although not necessarily the same order),
  253. ka.sort();
  254. kb.sort();
  255. //~~~cheap key test
  256. for (i = ka.length - 1; i >= 0; i--) {
  257. if (ka[i] != kb[i])
  258. return false;
  259. }
  260. //equivalent values for every corresponding key, and
  261. //~~~possibly expensive deep test
  262. for (i = ka.length - 1; i >= 0; i--) {
  263. key = ka[i];
  264. if (!_deepEqual(a[key], b[key])) return false;
  265. }
  266. return true;
  267. }
  268. // 8. The non-equivalence assertion tests for any deep inequality.
  269. // assert.notDeepEqual(actual, expected, message_opt);
  270. assert.notDeepEqual = function notDeepEqual(actual, expected, message) {
  271. if (_deepEqual(actual, expected)) {
  272. fail(actual, expected, message, 'notDeepEqual', assert.notDeepEqual);
  273. }
  274. };
  275. // 9. The strict equality assertion tests strict equality, as determined by ===.
  276. // assert.strictEqual(actual, expected, message_opt);
  277. assert.strictEqual = function strictEqual(actual, expected, message) {
  278. if (actual !== expected) {
  279. fail(actual, expected, message, '===', assert.strictEqual);
  280. }
  281. };
  282. // 10. The strict non-equality assertion tests for strict inequality, as
  283. // determined by !==. assert.notStrictEqual(actual, expected, message_opt);
  284. assert.notStrictEqual = function notStrictEqual(actual, expected, message) {
  285. if (actual === expected) {
  286. fail(actual, expected, message, '!==', assert.notStrictEqual);
  287. }
  288. };
  289. function expectedException(actual, expected) {
  290. if (!actual || !expected) {
  291. return false;
  292. }
  293. if (Object.prototype.toString.call(expected) == '[object RegExp]') {
  294. return expected.test(actual);
  295. } else if (actual instanceof expected) {
  296. return true;
  297. } else if (expected.call({}, actual) === true) {
  298. return true;
  299. }
  300. return false;
  301. }
  302. function _throws(shouldThrow, block, expected, message) {
  303. var actual;
  304. if (util.isString(expected)) {
  305. message = expected;
  306. expected = null;
  307. }
  308. try {
  309. block();
  310. } catch (e) {
  311. actual = e;
  312. }
  313. message = (expected && expected.name ? ' (' + expected.name + ').' : '.') +
  314. (message ? ' ' + message : '.');
  315. if (shouldThrow && !actual) {
  316. fail(actual, expected, 'Missing expected exception' + message);
  317. }
  318. if (!shouldThrow && expectedException(actual, expected)) {
  319. fail(actual, expected, 'Got unwanted exception' + message);
  320. }
  321. if ((shouldThrow && actual && expected &&
  322. !expectedException(actual, expected)) || (!shouldThrow && actual)) {
  323. throw actual;
  324. }
  325. }
  326. // 11. Expected to throw an error:
  327. // assert.throws(block, Error_opt, message_opt);
  328. assert.throws = function(block, /*optional*/error, /*optional*/message) {
  329. _throws.apply(this, [true].concat(pSlice.call(arguments)));
  330. };
  331. // EXTENSION! This is annoying to write outside this module.
  332. assert.doesNotThrow = function(block, /*optional*/message) {
  333. _throws.apply(this, [false].concat(pSlice.call(arguments)));
  334. };
  335. assert.ifError = function(err) { if (err) {throw err;}};
  336. var objectKeys = Object.keys || function (obj) {
  337. var keys = [];
  338. for (var key in obj) {
  339. if (hasOwn.call(obj, key)) keys.push(key);
  340. }
  341. return keys;
  342. };
  343. },{"util/":8}],6:[function(require,module,exports){
  344. if (typeof Object.create === 'function') {
  345. // implementation from standard node.js 'util' module
  346. module.exports = function inherits(ctor, superCtor) {
  347. ctor.super_ = superCtor
  348. ctor.prototype = Object.create(superCtor.prototype, {
  349. constructor: {
  350. value: ctor,
  351. enumerable: false,
  352. writable: true,
  353. configurable: true
  354. }
  355. });
  356. };
  357. } else {
  358. // old school shim for old browsers
  359. module.exports = function inherits(ctor, superCtor) {
  360. ctor.super_ = superCtor
  361. var TempCtor = function () {}
  362. TempCtor.prototype = superCtor.prototype
  363. ctor.prototype = new TempCtor()
  364. ctor.prototype.constructor = ctor
  365. }
  366. }
  367. },{}],7:[function(require,module,exports){
  368. module.exports = function isBuffer(arg) {
  369. return arg && typeof arg === 'object'
  370. && typeof arg.copy === 'function'
  371. && typeof arg.fill === 'function'
  372. && typeof arg.readUInt8 === 'function';
  373. }
  374. },{}],8:[function(require,module,exports){
  375. (function (process,global){
  376. // Copyright Joyent, Inc. and other Node contributors.
  377. //
  378. // Permission is hereby granted, free of charge, to any person obtaining a
  379. // copy of this software and associated documentation files (the
  380. // "Software"), to deal in the Software without restriction, including
  381. // without limitation the rights to use, copy, modify, merge, publish,
  382. // distribute, sublicense, and/or sell copies of the Software, and to permit
  383. // persons to whom the Software is furnished to do so, subject to the
  384. // following conditions:
  385. //
  386. // The above copyright notice and this permission notice shall be included
  387. // in all copies or substantial portions of the Software.
  388. //
  389. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  390. // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  391. // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  392. // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  393. // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  394. // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  395. // USE OR OTHER DEALINGS IN THE SOFTWARE.
  396. var formatRegExp = /%[sdj%]/g;
  397. exports.format = function(f) {
  398. if (!isString(f)) {
  399. var objects = [];
  400. for (var i = 0; i < arguments.length; i++) {
  401. objects.push(inspect(arguments[i]));
  402. }
  403. return objects.join(' ');
  404. }
  405. var i = 1;
  406. var args = arguments;
  407. var len = args.length;
  408. var str = String(f).replace(formatRegExp, function(x) {
  409. if (x === '%%') return '%';
  410. if (i >= len) return x;
  411. switch (x) {
  412. case '%s': return String(args[i++]);
  413. case '%d': return Number(args[i++]);
  414. case '%j':
  415. try {
  416. return JSON.stringify(args[i++]);
  417. } catch (_) {
  418. return '[Circular]';
  419. }
  420. default:
  421. return x;
  422. }
  423. });
  424. for (var x = args[i]; i < len; x = args[++i]) {
  425. if (isNull(x) || !isObject(x)) {
  426. str += ' ' + x;
  427. } else {
  428. str += ' ' + inspect(x);
  429. }
  430. }
  431. return str;
  432. };
  433. // Mark that a method should not be used.
  434. // Returns a modified function which warns once by default.
  435. // If --no-deprecation is set, then it is a no-op.
  436. exports.deprecate = function(fn, msg) {
  437. // Allow for deprecating things in the process of starting up.
  438. if (isUndefined(global.process)) {
  439. return function() {
  440. return exports.deprecate(fn, msg).apply(this, arguments);
  441. };
  442. }
  443. if (process.noDeprecation === true) {
  444. return fn;
  445. }
  446. var warned = false;
  447. function deprecated() {
  448. if (!warned) {
  449. if (process.throwDeprecation) {
  450. throw new Error(msg);
  451. } else if (process.traceDeprecation) {
  452. console.trace(msg);
  453. } else {
  454. console.error(msg);
  455. }
  456. warned = true;
  457. }
  458. return fn.apply(this, arguments);
  459. }
  460. return deprecated;
  461. };
  462. var debugs = {};
  463. var debugEnviron;
  464. exports.debuglog = function(set) {
  465. if (isUndefined(debugEnviron))
  466. debugEnviron = process.env.NODE_DEBUG || '';
  467. set = set.toUpperCase();
  468. if (!debugs[set]) {
  469. if (new RegExp('\\b' + set + '\\b', 'i').test(debugEnviron)) {
  470. var pid = process.pid;
  471. debugs[set] = function() {
  472. var msg = exports.format.apply(exports, arguments);
  473. console.error('%s %d: %s', set, pid, msg);
  474. };
  475. } else {
  476. debugs[set] = function() {};
  477. }
  478. }
  479. return debugs[set];
  480. };
  481. /**
  482. * Echos the value of a value. Trys to print the value out
  483. * in the best way possible given the different types.
  484. *
  485. * @param {Object} obj The object to print out.
  486. * @param {Object} opts Optional options object that alters the output.
  487. */
  488. /* legacy: obj, showHidden, depth, colors*/
  489. function inspect(obj, opts) {
  490. // default options
  491. var ctx = {
  492. seen: [],
  493. stylize: stylizeNoColor
  494. };
  495. // legacy...
  496. if (arguments.length >= 3) ctx.depth = arguments[2];
  497. if (arguments.length >= 4) ctx.colors = arguments[3];
  498. if (isBoolean(opts)) {
  499. // legacy...
  500. ctx.showHidden = opts;
  501. } else if (opts) {
  502. // got an "options" object
  503. exports._extend(ctx, opts);
  504. }
  505. // set default options
  506. if (isUndefined(ctx.showHidden)) ctx.showHidden = false;
  507. if (isUndefined(ctx.depth)) ctx.depth = 2;
  508. if (isUndefined(ctx.colors)) ctx.colors = false;
  509. if (isUndefined(ctx.customInspect)) ctx.customInspect = true;
  510. if (ctx.colors) ctx.stylize = stylizeWithColor;
  511. return formatValue(ctx, obj, ctx.depth);
  512. }
  513. exports.inspect = inspect;
  514. // http://en.wikipedia.org/wiki/ANSI_escape_code#graphics
  515. inspect.colors = {
  516. 'bold' : [1, 22],
  517. 'italic' : [3, 23],
  518. 'underline' : [4, 24],
  519. 'inverse' : [7, 27],
  520. 'white' : [37, 39],
  521. 'grey' : [90, 39],
  522. 'black' : [30, 39],
  523. 'blue' : [34, 39],
  524. 'cyan' : [36, 39],
  525. 'green' : [32, 39],
  526. 'magenta' : [35, 39],
  527. 'red' : [31, 39],
  528. 'yellow' : [33, 39]
  529. };
  530. // Don't use 'blue' not visible on cmd.exe
  531. inspect.styles = {
  532. 'special': 'cyan',
  533. 'number': 'yellow',
  534. 'boolean': 'yellow',
  535. 'undefined': 'grey',
  536. 'null': 'bold',
  537. 'string': 'green',
  538. 'date': 'magenta',
  539. // "name": intentionally not styling
  540. 'regexp': 'red'
  541. };
  542. function stylizeWithColor(str, styleType) {
  543. var style = inspect.styles[styleType];
  544. if (style) {
  545. return '\u001b[' + inspect.colors[style][0] + 'm' + str +
  546. '\u001b[' + inspect.colors[style][1] + 'm';
  547. } else {
  548. return str;
  549. }
  550. }
  551. function stylizeNoColor(str, styleType) {
  552. return str;
  553. }
  554. function arrayToHash(array) {
  555. var hash = {};
  556. array.forEach(function(val, idx) {
  557. hash[val] = true;
  558. });
  559. return hash;
  560. }
  561. function formatValue(ctx, value, recurseTimes) {
  562. // Provide a hook for user-specified inspect functions.
  563. // Check that value is an object with an inspect function on it
  564. if (ctx.customInspect &&
  565. value &&
  566. isFunction(value.inspect) &&
  567. // Filter out the util module, it's inspect function is special
  568. value.inspect !== exports.inspect &&
  569. // Also filter out any prototype objects using the circular check.
  570. !(value.constructor && value.constructor.prototype === value)) {
  571. var ret = value.inspect(recurseTimes, ctx);
  572. if (!isString(ret)) {
  573. ret = formatValue(ctx, ret, recurseTimes);
  574. }
  575. return ret;
  576. }
  577. // Primitive types cannot have properties
  578. var primitive = formatPrimitive(ctx, value);
  579. if (primitive) {
  580. return primitive;
  581. }
  582. // Look up the keys of the object.
  583. var keys = Object.keys(value);
  584. var visibleKeys = arrayToHash(keys);
  585. if (ctx.showHidden) {
  586. keys = Object.getOwnPropertyNames(value);
  587. }
  588. // IE doesn't make error fields non-enumerable
  589. // http://msdn.microsoft.com/en-us/library/ie/dww52sbt(v=vs.94).aspx
  590. if (isError(value)
  591. && (keys.indexOf('message') >= 0 || keys.indexOf('description') >= 0)) {
  592. return formatError(value);
  593. }
  594. // Some type of object without properties can be shortcutted.
  595. if (keys.length === 0) {
  596. if (isFunction(value)) {
  597. var name = value.name ? ': ' + value.name : '';
  598. return ctx.stylize('[Function' + name + ']', 'special');
  599. }
  600. if (isRegExp(value)) {
  601. return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
  602. }
  603. if (isDate(value)) {
  604. return ctx.stylize(Date.prototype.toString.call(value), 'date');
  605. }
  606. if (isError(value)) {
  607. return formatError(value);
  608. }
  609. }
  610. var base = '', array = false, braces = ['{', '}'];
  611. // Make Array say that they are Array
  612. if (isArray(value)) {
  613. array = true;
  614. braces = ['[', ']'];
  615. }
  616. // Make functions say that they are functions
  617. if (isFunction(value)) {
  618. var n = value.name ? ': ' + value.name : '';
  619. base = ' [Function' + n + ']';
  620. }
  621. // Make RegExps say that they are RegExps
  622. if (isRegExp(value)) {
  623. base = ' ' + RegExp.prototype.toString.call(value);
  624. }
  625. // Make dates with properties first say the date
  626. if (isDate(value)) {
  627. base = ' ' + Date.prototype.toUTCString.call(value);
  628. }
  629. // Make error with message first say the error
  630. if (isError(value)) {
  631. base = ' ' + formatError(value);
  632. }
  633. if (keys.length === 0 && (!array || value.length == 0)) {
  634. return braces[0] + base + braces[1];
  635. }
  636. if (recurseTimes < 0) {
  637. if (isRegExp(value)) {
  638. return ctx.stylize(RegExp.prototype.toString.call(value), 'regexp');
  639. } else {
  640. return ctx.stylize('[Object]', 'special');
  641. }
  642. }
  643. ctx.seen.push(value);
  644. var output;
  645. if (array) {
  646. output = formatArray(ctx, value, recurseTimes, visibleKeys, keys);
  647. } else {
  648. output = keys.map(function(key) {
  649. return formatProperty(ctx, value, recurseTimes, visibleKeys, key, array);
  650. });
  651. }
  652. ctx.seen.pop();
  653. return reduceToSingleString(output, base, braces);
  654. }
  655. function formatPrimitive(ctx, value) {
  656. if (isUndefined(value))
  657. return ctx.stylize('undefined', 'undefined');
  658. if (isString(value)) {
  659. var simple = '\'' + JSON.stringify(value).replace(/^"|"$/g, '')
  660. .replace(/'/g, "\\'")
  661. .replace(/\\"/g, '"') + '\'';
  662. return ctx.stylize(simple, 'string');
  663. }
  664. if (isNumber(value))
  665. return ctx.stylize('' + value, 'number');
  666. if (isBoolean(value))
  667. return ctx.stylize('' + value, 'boolean');
  668. // For some reason typeof null is "object", so special case here.
  669. if (isNull(value))
  670. return ctx.stylize('null', 'null');
  671. }
  672. function formatError(value) {
  673. return '[' + Error.prototype.toString.call(value) + ']';
  674. }
  675. function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
  676. var output = [];
  677. for (var i = 0, l = value.length; i < l; ++i) {
  678. if (hasOwnProperty(value, String(i))) {
  679. output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
  680. String(i), true));
  681. } else {
  682. output.push('');
  683. }
  684. }
  685. keys.forEach(function(key) {
  686. if (!key.match(/^\d+$/)) {
  687. output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
  688. key, true));
  689. }
  690. });
  691. return output;
  692. }
  693. function formatProperty(ctx, value, recurseTimes, visibleKeys, key, array) {
  694. var name, str, desc;
  695. desc = Object.getOwnPropertyDescriptor(value, key) || { value: value[key] };
  696. if (desc.get) {
  697. if (desc.set) {
  698. str = ctx.stylize('[Getter/Setter]', 'special');
  699. } else {
  700. str = ctx.stylize('[Getter]', 'special');
  701. }
  702. } else {
  703. if (desc.set) {
  704. str = ctx.stylize('[Setter]', 'special');
  705. }
  706. }
  707. if (!hasOwnProperty(visibleKeys, key)) {
  708. name = '[' + key + ']';
  709. }
  710. if (!str) {
  711. if (ctx.seen.indexOf(desc.value) < 0) {
  712. if (isNull(recurseTimes)) {
  713. str = formatValue(ctx, desc.value, null);
  714. } else {
  715. str = formatValue(ctx, desc.value, recurseTimes - 1);
  716. }
  717. if (str.indexOf('\n') > -1) {
  718. if (array) {
  719. str = str.split('\n').map(function(line) {
  720. return ' ' + line;
  721. }).join('\n').substr(2);
  722. } else {
  723. str = '\n' + str.split('\n').map(function(line) {
  724. return ' ' + line;
  725. }).join('\n');
  726. }
  727. }
  728. } else {
  729. str = ctx.stylize('[Circular]', 'special');
  730. }
  731. }
  732. if (isUndefined(name)) {
  733. if (array && key.match(/^\d+$/)) {
  734. return str;
  735. }
  736. name = JSON.stringify('' + key);
  737. if (name.match(/^"([a-zA-Z_][a-zA-Z_0-9]*)"$/)) {
  738. name = name.substr(1, name.length - 2);
  739. name = ctx.stylize(name, 'name');
  740. } else {
  741. name = name.replace(/'/g, "\\'")
  742. .replace(/\\"/g, '"')
  743. .replace(/(^"|"$)/g, "'");
  744. name = ctx.stylize(name, 'string');
  745. }
  746. }
  747. return name + ': ' + str;
  748. }
  749. function reduceToSingleString(output, base, braces) {
  750. var numLinesEst = 0;
  751. var length = output.reduce(function(prev, cur) {
  752. numLinesEst++;
  753. if (cur.indexOf('\n') >= 0) numLinesEst++;
  754. return prev + cur.replace(/\u001b\[\d\d?m/g, '').length + 1;
  755. }, 0);
  756. if (length > 60) {
  757. return braces[0] +
  758. (base === '' ? '' : base + '\n ') +
  759. ' ' +
  760. output.join(',\n ') +
  761. ' ' +
  762. braces[1];
  763. }
  764. return braces[0] + base + ' ' + output.join(', ') + ' ' + braces[1];
  765. }
  766. // NOTE: These type checking functions intentionally don't use `instanceof`
  767. // because it is fragile and can be easily faked with `Object.create()`.
  768. function isArray(ar) {
  769. return Array.isArray(ar);
  770. }
  771. exports.isArray = isArray;
  772. function isBoolean(arg) {
  773. return typeof arg === 'boolean';
  774. }
  775. exports.isBoolean = isBoolean;
  776. function isNull(arg) {
  777. return arg === null;
  778. }
  779. exports.isNull = isNull;
  780. function isNullOrUndefined(arg) {
  781. return arg == null;
  782. }
  783. exports.isNullOrUndefined = isNullOrUndefined;
  784. function isNumber(arg) {
  785. return typeof arg === 'number';
  786. }
  787. exports.isNumber = isNumber;
  788. function isString(arg) {
  789. return typeof arg === 'string';
  790. }
  791. exports.isString = isString;
  792. function isSymbol(arg) {
  793. return typeof arg === 'symbol';
  794. }
  795. exports.isSymbol = isSymbol;
  796. function isUndefined(arg) {
  797. return arg === void 0;
  798. }
  799. exports.isUndefined = isUndefined;
  800. function isRegExp(re) {
  801. return isObject(re) && objectToString(re) === '[object RegExp]';
  802. }
  803. exports.isRegExp = isRegExp;
  804. function isObject(arg) {
  805. return typeof arg === 'object' && arg !== null;
  806. }
  807. exports.isObject = isObject;
  808. function isDate(d) {
  809. return isObject(d) && objectToString(d) === '[object Date]';
  810. }
  811. exports.isDate = isDate;
  812. function isError(e) {
  813. return isObject(e) &&
  814. (objectToString(e) === '[object Error]' || e instanceof Error);
  815. }
  816. exports.isError = isError;
  817. function isFunction(arg) {
  818. return typeof arg === 'function';
  819. }
  820. exports.isFunction = isFunction;
  821. function isPrimitive(arg) {
  822. return arg === null ||
  823. typeof arg === 'boolean' ||
  824. typeof arg === 'number' ||
  825. typeof arg === 'string' ||
  826. typeof arg === 'symbol' || // ES6 symbol
  827. typeof arg === 'undefined';
  828. }
  829. exports.isPrimitive = isPrimitive;
  830. exports.isBuffer = require('./support/isBuffer');
  831. function objectToString(o) {
  832. return Object.prototype.toString.call(o);
  833. }
  834. function pad(n) {
  835. return n < 10 ? '0' + n.toString(10) : n.toString(10);
  836. }
  837. var months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
  838. 'Oct', 'Nov', 'Dec'];
  839. // 26 Feb 16:19:34
  840. function timestamp() {
  841. var d = new Date();
  842. var time = [pad(d.getHours()),
  843. pad(d.getMinutes()),
  844. pad(d.getSeconds())].join(':');
  845. return [d.getDate(), months[d.getMonth()], time].join(' ');
  846. }
  847. // log is just a thin wrapper to console.log that prepends a timestamp
  848. exports.log = function() {
  849. console.log('%s - %s', timestamp(), exports.format.apply(exports, arguments));
  850. };
  851. /**
  852. * Inherit the prototype methods from one constructor into another.
  853. *
  854. * The Function.prototype.inherits from lang.js rewritten as a standalone
  855. * function (not on Function.prototype). NOTE: If this file is to be loaded
  856. * during bootstrapping this function needs to be rewritten using some native
  857. * functions as prototype setup using normal JavaScript does not work as
  858. * expected during bootstrapping (see mirror.js in r114903).
  859. *
  860. * @param {function} ctor Constructor function which needs to inherit the
  861. * prototype.
  862. * @param {function} superCtor Constructor function to inherit prototype from.
  863. */
  864. exports.inherits = require('inherits');
  865. exports._extend = function(origin, add) {
  866. // Don't do anything if add isn't an object
  867. if (!add || !isObject(add)) return origin;
  868. var keys = Object.keys(add);
  869. var i = keys.length;
  870. while (i--) {
  871. origin[keys[i]] = add[keys[i]];
  872. }
  873. return origin;
  874. };
  875. function hasOwnProperty(obj, prop) {
  876. return Object.prototype.hasOwnProperty.call(obj, prop);
  877. }
  878. }).call(this,require('_process'),typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  879. },{"./support/isBuffer":7,"_process":13,"inherits":6}],9:[function(require,module,exports){
  880. (function (global){
  881. /*global window, global*/
  882. var util = require("util")
  883. var assert = require("assert")
  884. var now = require("date-now")
  885. var slice = Array.prototype.slice
  886. var console
  887. var times = {}
  888. if (typeof global !== "undefined" && global.console) {
  889. console = global.console
  890. } else if (typeof window !== "undefined" && window.console) {
  891. console = window.console
  892. } else {
  893. console = {}
  894. }
  895. var functions = [
  896. [log, "log"],
  897. [info, "info"],
  898. [warn, "warn"],
  899. [error, "error"],
  900. [time, "time"],
  901. [timeEnd, "timeEnd"],
  902. [trace, "trace"],
  903. [dir, "dir"],
  904. [consoleAssert, "assert"]
  905. ]
  906. for (var i = 0; i < functions.length; i++) {
  907. var tuple = functions[i]
  908. var f = tuple[0]
  909. var name = tuple[1]
  910. if (!console[name]) {
  911. console[name] = f
  912. }
  913. }
  914. module.exports = console
  915. function log() {}
  916. function info() {
  917. console.log.apply(console, arguments)
  918. }
  919. function warn() {
  920. console.log.apply(console, arguments)
  921. }
  922. function error() {
  923. console.warn.apply(console, arguments)
  924. }
  925. function time(label) {
  926. times[label] = now()
  927. }
  928. function timeEnd(label) {
  929. var time = times[label]
  930. if (!time) {
  931. throw new Error("No such label: " + label)
  932. }
  933. var duration = now() - time
  934. console.log(label + ": " + duration + "ms")
  935. }
  936. function trace() {
  937. var err = new Error()
  938. err.name = "Trace"
  939. err.message = util.format.apply(null, arguments)
  940. console.error(err.stack)
  941. }
  942. function dir(object) {
  943. console.log(util.inspect(object) + "\n")
  944. }
  945. function consoleAssert(expression) {
  946. if (!expression) {
  947. var arr = slice.call(arguments, 1)
  948. assert.ok(false, util.format.apply(null, arr))
  949. }
  950. }
  951. }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  952. },{"assert":5,"date-now":10,"util":16}],10:[function(require,module,exports){
  953. module.exports = now
  954. function now() {
  955. return new Date().getTime()
  956. }
  957. },{}],11:[function(require,module,exports){
  958. // Copyright Joyent, Inc. and other Node contributors.
  959. //
  960. // Permission is hereby granted, free of charge, to any person obtaining a
  961. // copy of this software and associated documentation files (the
  962. // "Software"), to deal in the Software without restriction, including
  963. // without limitation the rights to use, copy, modify, merge, publish,
  964. // distribute, sublicense, and/or sell copies of the Software, and to permit
  965. // persons to whom the Software is furnished to do so, subject to the
  966. // following conditions:
  967. //
  968. // The above copyright notice and this permission notice shall be included
  969. // in all copies or substantial portions of the Software.
  970. //
  971. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  972. // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  973. // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
  974. // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
  975. // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  976. // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  977. // USE OR OTHER DEALINGS IN THE SOFTWARE.
  978. function EventEmitter() {
  979. this._events = this._events || {};
  980. this._maxListeners = this._maxListeners || undefined;
  981. }
  982. module.exports = EventEmitter;
  983. // Backwards-compat with node 0.10.x
  984. EventEmitter.EventEmitter = EventEmitter;
  985. EventEmitter.prototype._events = undefined;
  986. EventEmitter.prototype._maxListeners = undefined;
  987. // By default EventEmitters will print a warning if more than 10 listeners are
  988. // added to it. This is a useful default which helps finding memory leaks.
  989. EventEmitter.defaultMaxListeners = 10;
  990. // Obviously not all Emitters should be limited to 10. This function allows
  991. // that to be increased. Set to zero for unlimited.
  992. EventEmitter.prototype.setMaxListeners = function(n) {
  993. if (!isNumber(n) || n < 0 || isNaN(n))
  994. throw TypeError('n must be a positive number');
  995. this._maxListeners = n;
  996. return this;
  997. };
  998. EventEmitter.prototype.emit = function(type) {
  999. var er, handler, len, args, i, listeners;
  1000. if (!this._events)
  1001. this._events = {};
  1002. // If there is no 'error' event listener then throw.
  1003. if (type === 'error') {
  1004. if (!this._events.error ||
  1005. (isObject(this._events.error) && !this._events.error.length)) {
  1006. er = arguments[1];
  1007. if (er instanceof Error) {
  1008. throw er; // Unhandled 'error' event
  1009. }
  1010. throw TypeError('Uncaught, unspecified "error" event.');
  1011. }
  1012. }
  1013. handler = this._events[type];
  1014. if (isUndefined(handler))
  1015. return false;
  1016. if (isFunction(handler)) {
  1017. switch (arguments.length) {
  1018. // fast cases
  1019. case 1:
  1020. handler.call(this);
  1021. break;
  1022. case 2:
  1023. handler.call(this, arguments[1]);
  1024. break;
  1025. case 3:
  1026. handler.call(this, arguments[1], arguments[2]);
  1027. break;
  1028. // slower
  1029. default:
  1030. len = arguments.length;
  1031. args = new Array(len - 1);
  1032. for (i = 1; i < len; i++)
  1033. args[i - 1] = arguments[i];
  1034. handler.apply(this, args);
  1035. }
  1036. } else if (isObject(handler)) {
  1037. len = arguments.length;
  1038. args = new Array(len - 1);
  1039. for (i = 1; i < len; i++)
  1040. args[i - 1] = arguments[i];
  1041. listeners = handler.slice();
  1042. len = listeners.length;
  1043. for (i = 0; i < len; i++)
  1044. listeners[i].apply(this, args);
  1045. }
  1046. return true;
  1047. };
  1048. EventEmitter.prototype.addListener = function(type, listener) {
  1049. var m;
  1050. if (!isFunction(listener))
  1051. throw TypeError('listener must be a function');
  1052. if (!this._events)
  1053. this._events = {};
  1054. // To avoid recursion in the case that type === "newListener"! Before
  1055. // adding it to the listeners, first emit "newListener".
  1056. if (this._events.newListener)
  1057. this.emit('newListener', type,
  1058. isFunction(listener.listener) ?
  1059. listener.listener : listener);
  1060. if (!this._events[type])
  1061. // Optimize the case of one listener. Don't need the extra array object.
  1062. this._events[type] = listener;
  1063. else if (isObject(this._events[type]))
  1064. // If we've already got an array, just append.
  1065. this._events[type].push(listener);
  1066. else
  1067. // Adding the second element, need to change to array.
  1068. this._events[type] = [this._events[type], listener];
  1069. // Check for listener leak
  1070. if (isObject(this._events[type]) && !this._events[type].warned) {
  1071. var m;
  1072. if (!isUndefined(this._maxListeners)) {
  1073. m = this._maxListeners;
  1074. } else {
  1075. m = EventEmitter.defaultMaxListeners;
  1076. }
  1077. if (m && m > 0 && this._events[type].length > m) {
  1078. this._events[type].warned = true;
  1079. console.error('(node) warning: possible EventEmitter memory ' +
  1080. 'leak detected. %d listeners added. ' +
  1081. 'Use emitter.setMaxListeners() to increase limit.',
  1082. this._events[type].length);
  1083. if (typeof console.trace === 'function') {
  1084. // not supported in IE 10
  1085. console.trace();
  1086. }
  1087. }
  1088. }
  1089. return this;
  1090. };
  1091. EventEmitter.prototype.on = EventEmitter.prototype.addListener;
  1092. EventEmitter.prototype.once = function(type, listener) {
  1093. if (!isFunction(listener))
  1094. throw TypeError('listener must be a function');
  1095. var fired = false;
  1096. function g() {
  1097. this.removeListener(type, g);
  1098. if (!fired) {
  1099. fired = true;
  1100. listener.apply(this, arguments);
  1101. }
  1102. }
  1103. g.listener = listener;
  1104. this.on(type, g);
  1105. return this;
  1106. };
  1107. // emits a 'removeListener' event iff the listener was removed
  1108. EventEmitter.prototype.removeListener = function(type, listener) {
  1109. var list, position, length, i;
  1110. if (!isFunction(listener))
  1111. throw TypeError('listener must be a function');
  1112. if (!this._events || !this._events[type])
  1113. return this;
  1114. list = this._events[type];
  1115. length = list.length;
  1116. position = -1;
  1117. if (list === listener ||
  1118. (isFunction(list.listener) && list.listener === listener)) {
  1119. delete this._events[type];
  1120. if (this._events.removeListener)
  1121. this.emit('removeListener', type, listener);
  1122. } else if (isObject(list)) {
  1123. for (i = length; i-- > 0;) {
  1124. if (list[i] === listener ||
  1125. (list[i].listener && list[i].listener === listener)) {
  1126. position = i;
  1127. break;
  1128. }
  1129. }
  1130. if (position < 0)
  1131. return this;
  1132. if (list.length === 1) {
  1133. list.length = 0;
  1134. delete this._events[type];
  1135. } else {
  1136. list.splice(position, 1);
  1137. }
  1138. if (this._events.removeListener)
  1139. this.emit('removeListener', type, listener);
  1140. }
  1141. return this;
  1142. };
  1143. EventEmitter.prototype.removeAllListeners = function(type) {
  1144. var key, listeners;
  1145. if (!this._events)
  1146. return this;
  1147. // not listening for removeListener, no need to emit
  1148. if (!this._events.removeListener) {
  1149. if (arguments.length === 0)
  1150. this._events = {};
  1151. else if (this._events[type])
  1152. delete this._events[type];
  1153. return this;
  1154. }
  1155. // emit removeListener for all listeners on all events
  1156. if (arguments.length === 0) {
  1157. for (key in this._events) {
  1158. if (key === 'removeListener') continue;
  1159. this.removeAllListeners(key);
  1160. }
  1161. this.removeAllListeners('removeListener');
  1162. this._events = {};
  1163. return this;
  1164. }
  1165. listeners = this._events[type];
  1166. if (isFunction(listeners)) {
  1167. this.removeListener(type, listeners);
  1168. } else {
  1169. // LIFO order
  1170. while (listeners.length)
  1171. this.removeListener(type, listeners[listeners.length - 1]);
  1172. }
  1173. delete this._events[type];
  1174. return this;
  1175. };
  1176. EventEmitter.prototype.listeners = function(type) {
  1177. var ret;
  1178. if (!this._events || !this._events[type])
  1179. ret = [];
  1180. else if (isFunction(this._events[type]))
  1181. ret = [this._events[type]];
  1182. else
  1183. ret = this._events[type].slice();
  1184. return ret;
  1185. };
  1186. EventEmitter.listenerCount = function(emitter, type) {
  1187. var ret;
  1188. if (!emitter._events || !emitter._events[type])
  1189. ret = 0;
  1190. else if (isFunction(emitter._events[type]))
  1191. ret = 1;
  1192. else
  1193. ret = emitter._events[type].length;
  1194. return ret;
  1195. };
  1196. function isFunction(arg) {
  1197. return typeof arg === 'function';
  1198. }
  1199. function isNumber(arg) {
  1200. return typeof arg === 'number';
  1201. }
  1202. function isObject(arg) {
  1203. return typeof arg === 'object' && arg !== null;
  1204. }
  1205. function isUndefined(arg) {
  1206. return arg === void 0;
  1207. }
  1208. },{}],12:[function(require,module,exports){
  1209. (function (global){
  1210. /**
  1211. * @license
  1212. * Lodash <https://lodash.com/>
  1213. * Copyright OpenJS Foundation and other contributors <https://openjsf.org/>
  1214. * Released under MIT license <https://lodash.com/license>
  1215. * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
  1216. * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
  1217. */
  1218. ;(function() {
  1219. /** Used as a safe reference for `undefined` in pre-ES5 environments. */
  1220. var undefined;
  1221. /** Used as the semantic version number. */
  1222. var VERSION = '4.17.20';
  1223. /** Used as the size to enable large array optimizations. */
  1224. var LARGE_ARRAY_SIZE = 200;
  1225. /** Error message constants. */
  1226. var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
  1227. FUNC_ERROR_TEXT = 'Expected a function';
  1228. /** Used to stand-in for `undefined` hash values. */
  1229. var HASH_UNDEFINED = '__lodash_hash_undefined__';
  1230. /** Used as the maximum memoize cache size. */
  1231. var MAX_MEMOIZE_SIZE = 500;
  1232. /** Used as the internal argument placeholder. */
  1233. var PLACEHOLDER = '__lodash_placeholder__';
  1234. /** Used to compose bitmasks for cloning. */
  1235. var CLONE_DEEP_FLAG = 1,
  1236. CLONE_FLAT_FLAG = 2,
  1237. CLONE_SYMBOLS_FLAG = 4;
  1238. /** Used to compose bitmasks for value comparisons. */
  1239. var COMPARE_PARTIAL_FLAG = 1,
  1240. COMPARE_UNORDERED_FLAG = 2;
  1241. /** Used to compose bitmasks for function metadata. */
  1242. var WRAP_BIND_FLAG = 1,
  1243. WRAP_BIND_KEY_FLAG = 2,
  1244. WRAP_CURRY_BOUND_FLAG = 4,
  1245. WRAP_CURRY_FLAG = 8,
  1246. WRAP_CURRY_RIGHT_FLAG = 16,
  1247. WRAP_PARTIAL_FLAG = 32,
  1248. WRAP_PARTIAL_RIGHT_FLAG = 64,
  1249. WRAP_ARY_FLAG = 128,
  1250. WRAP_REARG_FLAG = 256,
  1251. WRAP_FLIP_FLAG = 512;
  1252. /** Used as default options for `_.truncate`. */
  1253. var DEFAULT_TRUNC_LENGTH = 30,
  1254. DEFAULT_TRUNC_OMISSION = '...';
  1255. /** Used to detect hot functions by number of calls within a span of milliseconds. */
  1256. var HOT_COUNT = 800,
  1257. HOT_SPAN = 16;
  1258. /** Used to indicate the type of lazy iteratees. */
  1259. var LAZY_FILTER_FLAG = 1,
  1260. LAZY_MAP_FLAG = 2,
  1261. LAZY_WHILE_FLAG = 3;
  1262. /** Used as references for various `Number` constants. */
  1263. var INFINITY = 1 / 0,
  1264. MAX_SAFE_INTEGER = 9007199254740991,
  1265. MAX_INTEGER = 1.7976931348623157e+308,
  1266. NAN = 0 / 0;
  1267. /** Used as references for the maximum length and index of an array. */
  1268. var MAX_ARRAY_LENGTH = 4294967295,
  1269. MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
  1270. HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;
  1271. /** Used to associate wrap methods with their bit flags. */
  1272. var wrapFlags = [
  1273. ['ary', WRAP_ARY_FLAG],
  1274. ['bind', WRAP_BIND_FLAG],
  1275. ['bindKey', WRAP_BIND_KEY_FLAG],
  1276. ['curry', WRAP_CURRY_FLAG],
  1277. ['curryRight', WRAP_CURRY_RIGHT_FLAG],
  1278. ['flip', WRAP_FLIP_FLAG],
  1279. ['partial', WRAP_PARTIAL_FLAG],
  1280. ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],
  1281. ['rearg', WRAP_REARG_FLAG]
  1282. ];
  1283. /** `Object#toString` result references. */
  1284. var argsTag = '[object Arguments]',
  1285. arrayTag = '[object Array]',
  1286. asyncTag = '[object AsyncFunction]',
  1287. boolTag = '[object Boolean]',
  1288. dateTag = '[object Date]',
  1289. domExcTag = '[object DOMException]',
  1290. errorTag = '[object Error]',
  1291. funcTag = '[object Function]',
  1292. genTag = '[object GeneratorFunction]',
  1293. mapTag = '[object Map]',
  1294. numberTag = '[object Number]',
  1295. nullTag = '[object Null]',
  1296. objectTag = '[object Object]',
  1297. promiseTag = '[object Promise]',
  1298. proxyTag = '[object Proxy]',
  1299. regexpTag = '[object RegExp]',
  1300. setTag = '[object Set]',
  1301. stringTag = '[object String]',
  1302. symbolTag = '[object Symbol]',
  1303. undefinedTag = '[object Undefined]',
  1304. weakMapTag = '[object WeakMap]',
  1305. weakSetTag = '[object WeakSet]';
  1306. var arrayBufferTag = '[object ArrayBuffer]',
  1307. dataViewTag = '[object DataView]',
  1308. float32Tag = '[object Float32Array]',
  1309. float64Tag = '[object Float64Array]',
  1310. int8Tag = '[object Int8Array]',
  1311. int16Tag = '[object Int16Array]',
  1312. int32Tag = '[object Int32Array]',
  1313. uint8Tag = '[object Uint8Array]',
  1314. uint8ClampedTag = '[object Uint8ClampedArray]',
  1315. uint16Tag = '[object Uint16Array]',
  1316. uint32Tag = '[object Uint32Array]';
  1317. /** Used to match empty string literals in compiled template source. */
  1318. var reEmptyStringLeading = /\b__p \+= '';/g,
  1319. reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
  1320. reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
  1321. /** Used to match HTML entities and HTML characters. */
  1322. var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
  1323. reUnescapedHtml = /[&<>"']/g,
  1324. reHasEscapedHtml = RegExp(reEscapedHtml.source),
  1325. reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
  1326. /** Used to match template delimiters. */
  1327. var reEscape = /<%-([\s\S]+?)%>/g,
  1328. reEvaluate = /<%([\s\S]+?)%>/g,
  1329. reInterpolate = /<%=([\s\S]+?)%>/g;
  1330. /** Used to match property names within property paths. */
  1331. var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
  1332. reIsPlainProp = /^\w*$/,
  1333. rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
  1334. /**
  1335. * Used to match `RegExp`
  1336. * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
  1337. */
  1338. var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
  1339. reHasRegExpChar = RegExp(reRegExpChar.source);
  1340. /** Used to match leading and trailing whitespace. */
  1341. var reTrim = /^\s+|\s+$/g,
  1342. reTrimStart = /^\s+/,
  1343. reTrimEnd = /\s+$/;
  1344. /** Used to match wrap detail comments. */
  1345. var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
  1346. reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
  1347. reSplitDetails = /,? & /;
  1348. /** Used to match words composed of alphanumeric characters. */
  1349. var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;
  1350. /** Used to match backslashes in property paths. */
  1351. var reEscapeChar = /\\(\\)?/g;
  1352. /**
  1353. * Used to match
  1354. * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
  1355. */
  1356. var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
  1357. /** Used to match `RegExp` flags from their coerced string values. */
  1358. var reFlags = /\w*$/;
  1359. /** Used to detect bad signed hexadecimal string values. */
  1360. var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
  1361. /** Used to detect binary string values. */
  1362. var reIsBinary = /^0b[01]+$/i;
  1363. /** Used to detect host constructors (Safari). */
  1364. var reIsHostCtor = /^\[object .+?Constructor\]$/;
  1365. /** Used to detect octal string values. */
  1366. var reIsOctal = /^0o[0-7]+$/i;
  1367. /** Used to detect unsigned integer values. */
  1368. var reIsUint = /^(?:0|[1-9]\d*)$/;
  1369. /** Used to match Latin Unicode letters (excluding mathematical operators). */
  1370. var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;
  1371. /** Used to ensure capturing order of template delimiters. */
  1372. var reNoMatch = /($^)/;
  1373. /** Used to match unescaped characters in compiled string literals. */
  1374. var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
  1375. /** Used to compose unicode character classes. */
  1376. var rsAstralRange = '\\ud800-\\udfff',
  1377. rsComboMarksRange = '\\u0300-\\u036f',
  1378. reComboHalfMarksRange = '\\ufe20-\\ufe2f',
  1379. rsComboSymbolsRange = '\\u20d0-\\u20ff',
  1380. rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
  1381. rsDingbatRange = '\\u2700-\\u27bf',
  1382. rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
  1383. rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
  1384. rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
  1385. rsPunctuationRange = '\\u2000-\\u206f',
  1386. rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
  1387. rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
  1388. rsVarRange = '\\ufe0e\\ufe0f',
  1389. rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;
  1390. /** Used to compose unicode capture groups. */
  1391. var rsApos = "['\u2019]",
  1392. rsAstral = '[' + rsAstralRange + ']',
  1393. rsBreak = '[' + rsBreakRange + ']',
  1394. rsCombo = '[' + rsComboRange + ']',
  1395. rsDigits = '\\d+',
  1396. rsDingbat = '[' + rsDingbatRange + ']',
  1397. rsLower = '[' + rsLowerRange + ']',
  1398. rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
  1399. rsFitz = '\\ud83c[\\udffb-\\udfff]',
  1400. rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
  1401. rsNonAstral = '[^' + rsAstralRange + ']',
  1402. rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
  1403. rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
  1404. rsUpper = '[' + rsUpperRange + ']',
  1405. rsZWJ = '\\u200d';
  1406. /** Used to compose unicode regexes. */
  1407. var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
  1408. rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
  1409. rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
  1410. rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
  1411. reOptMod = rsModifier + '?',
  1412. rsOptVar = '[' + rsVarRange + ']?',
  1413. rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
  1414. rsOrdLower = '\\d*(?:1st|2nd|3rd|(?![123])\\dth)(?=\\b|[A-Z_])',
  1415. rsOrdUpper = '\\d*(?:1ST|2ND|3RD|(?![123])\\dTH)(?=\\b|[a-z_])',
  1416. rsSeq = rsOptVar + reOptMod + rsOptJoin,
  1417. rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,
  1418. rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
  1419. /** Used to match apostrophes. */
  1420. var reApos = RegExp(rsApos, 'g');
  1421. /**
  1422. * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
  1423. * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
  1424. */
  1425. var reComboMark = RegExp(rsCombo, 'g');
  1426. /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
  1427. var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
  1428. /** Used to match complex or compound words. */
  1429. var reUnicodeWord = RegExp([
  1430. rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
  1431. rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
  1432. rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
  1433. rsUpper + '+' + rsOptContrUpper,
  1434. rsOrdUpper,
  1435. rsOrdLower,
  1436. rsDigits,
  1437. rsEmoji
  1438. ].join('|'), 'g');
  1439. /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
  1440. var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');
  1441. /** Used to detect strings that need a more robust regexp to match words. */
  1442. var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;
  1443. /** Used to assign default `context` object properties. */
  1444. var contextProps = [
  1445. 'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
  1446. 'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
  1447. 'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
  1448. 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
  1449. '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
  1450. ];
  1451. /** Used to make template sourceURLs easier to identify. */
  1452. var templateCounter = -1;
  1453. /** Used to identify `toStringTag` values of typed arrays. */
  1454. var typedArrayTags = {};
  1455. typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
  1456. typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
  1457. typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
  1458. typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
  1459. typedArrayTags[uint32Tag] = true;
  1460. typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
  1461. typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
  1462. typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
  1463. typedArrayTags[errorTag] = typedArrayTags[funcTag] =
  1464. typedArrayTags[mapTag] = typedArrayTags[numberTag] =
  1465. typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
  1466. typedArrayTags[setTag] = typedArrayTags[stringTag] =
  1467. typedArrayTags[weakMapTag] = false;
  1468. /** Used to identify `toStringTag` values supported by `_.clone`. */
  1469. var cloneableTags = {};
  1470. cloneableTags[argsTag] = cloneableTags[arrayTag] =
  1471. cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
  1472. cloneableTags[boolTag] = cloneableTags[dateTag] =
  1473. cloneableTags[float32Tag] = cloneableTags[float64Tag] =
  1474. cloneableTags[int8Tag] = cloneableTags[int16Tag] =
  1475. cloneableTags[int32Tag] = cloneableTags[mapTag] =
  1476. cloneableTags[numberTag] = cloneableTags[objectTag] =
  1477. cloneableTags[regexpTag] = cloneableTags[setTag] =
  1478. cloneableTags[stringTag] = cloneableTags[symbolTag] =
  1479. cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
  1480. cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
  1481. cloneableTags[errorTag] = cloneableTags[funcTag] =
  1482. cloneableTags[weakMapTag] = false;
  1483. /** Used to map Latin Unicode letters to basic Latin letters. */
  1484. var deburredLetters = {
  1485. // Latin-1 Supplement block.
  1486. '\xc0': 'A', '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
  1487. '\xe0': 'a', '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
  1488. '\xc7': 'C', '\xe7': 'c',
  1489. '\xd0': 'D', '\xf0': 'd',
  1490. '\xc8': 'E', '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
  1491. '\xe8': 'e', '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
  1492. '\xcc': 'I', '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
  1493. '\xec': 'i', '\xed': 'i', '\xee': 'i', '\xef': 'i',
  1494. '\xd1': 'N', '\xf1': 'n',
  1495. '\xd2': 'O', '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
  1496. '\xf2': 'o', '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
  1497. '\xd9': 'U', '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
  1498. '\xf9': 'u', '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
  1499. '\xdd': 'Y', '\xfd': 'y', '\xff': 'y',
  1500. '\xc6': 'Ae', '\xe6': 'ae',
  1501. '\xde': 'Th', '\xfe': 'th',
  1502. '\xdf': 'ss',
  1503. // Latin Extended-A block.
  1504. '\u0100': 'A', '\u0102': 'A', '\u0104': 'A',
  1505. '\u0101': 'a', '\u0103': 'a', '\u0105': 'a',
  1506. '\u0106': 'C', '\u0108': 'C', '\u010a': 'C', '\u010c': 'C',
  1507. '\u0107': 'c', '\u0109': 'c', '\u010b': 'c', '\u010d': 'c',
  1508. '\u010e': 'D', '\u0110': 'D', '\u010f': 'd', '\u0111': 'd',
  1509. '\u0112': 'E', '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E',
  1510. '\u0113': 'e', '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e',
  1511. '\u011c': 'G', '\u011e': 'G', '\u0120': 'G', '\u0122': 'G',
  1512. '\u011d': 'g', '\u011f': 'g', '\u0121': 'g', '\u0123': 'g',
  1513. '\u0124': 'H', '\u0126': 'H', '\u0125': 'h', '\u0127': 'h',
  1514. '\u0128': 'I', '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I',
  1515. '\u0129': 'i', '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i',
  1516. '\u0134': 'J', '\u0135': 'j',
  1517. '\u0136': 'K', '\u0137': 'k', '\u0138': 'k',
  1518. '\u0139': 'L', '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L',
  1519. '\u013a': 'l', '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l',
  1520. '\u0143': 'N', '\u0145': 'N', '\u0147': 'N', '\u014a': 'N',
  1521. '\u0144': 'n', '\u0146': 'n', '\u0148': 'n', '\u014b': 'n',
  1522. '\u014c': 'O', '\u014e': 'O', '\u0150': 'O',
  1523. '\u014d': 'o', '\u014f': 'o', '\u0151': 'o',
  1524. '\u0154': 'R', '\u0156': 'R', '\u0158': 'R',
  1525. '\u0155': 'r', '\u0157': 'r', '\u0159': 'r',
  1526. '\u015a': 'S', '\u015c': 'S', '\u015e': 'S', '\u0160': 'S',
  1527. '\u015b': 's', '\u015d': 's', '\u015f': 's', '\u0161': 's',
  1528. '\u0162': 'T', '\u0164': 'T', '\u0166': 'T',
  1529. '\u0163': 't', '\u0165': 't', '\u0167': 't',
  1530. '\u0168': 'U', '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U',
  1531. '\u0169': 'u', '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u',
  1532. '\u0174': 'W', '\u0175': 'w',
  1533. '\u0176': 'Y', '\u0177': 'y', '\u0178': 'Y',
  1534. '\u0179': 'Z', '\u017b': 'Z', '\u017d': 'Z',
  1535. '\u017a': 'z', '\u017c': 'z', '\u017e': 'z',
  1536. '\u0132': 'IJ', '\u0133': 'ij',
  1537. '\u0152': 'Oe', '\u0153': 'oe',
  1538. '\u0149': "'n", '\u017f': 's'
  1539. };
  1540. /** Used to map characters to HTML entities. */
  1541. var htmlEscapes = {
  1542. '&': '&amp;',
  1543. '<': '&lt;',
  1544. '>': '&gt;',
  1545. '"': '&quot;',
  1546. "'": '&#39;'
  1547. };
  1548. /** Used to map HTML entities to characters. */
  1549. var htmlUnescapes = {
  1550. '&amp;': '&',
  1551. '&lt;': '<',
  1552. '&gt;': '>',
  1553. '&quot;': '"',
  1554. '&#39;': "'"
  1555. };
  1556. /** Used to escape characters for inclusion in compiled string literals. */
  1557. var stringEscapes = {
  1558. '\\': '\\',
  1559. "'": "'",
  1560. '\n': 'n',
  1561. '\r': 'r',
  1562. '\u2028': 'u2028',
  1563. '\u2029': 'u2029'
  1564. };
  1565. /** Built-in method references without a dependency on `root`. */
  1566. var freeParseFloat = parseFloat,
  1567. freeParseInt = parseInt;
  1568. /** Detect free variable `global` from Node.js. */
  1569. var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
  1570. /** Detect free variable `self`. */
  1571. var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
  1572. /** Used as a reference to the global object. */
  1573. var root = freeGlobal || freeSelf || Function('return this')();
  1574. /** Detect free variable `exports`. */
  1575. var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
  1576. /** Detect free variable `module`. */
  1577. var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
  1578. /** Detect the popular CommonJS extension `module.exports`. */
  1579. var moduleExports = freeModule && freeModule.exports === freeExports;
  1580. /** Detect free variable `process` from Node.js. */
  1581. var freeProcess = moduleExports && freeGlobal.process;
  1582. /** Used to access faster Node.js helpers. */
  1583. var nodeUtil = (function() {
  1584. try {
  1585. // Use `util.types` for Node.js 10+.
  1586. var types = freeModule && freeModule.require && freeModule.require('util').types;
  1587. if (types) {
  1588. return types;
  1589. }
  1590. // Legacy `process.binding('util')` for Node.js < 10.
  1591. return freeProcess && freeProcess.binding && freeProcess.binding('util');
  1592. } catch (e) {}
  1593. }());
  1594. /* Node.js helper references. */
  1595. var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,
  1596. nodeIsDate = nodeUtil && nodeUtil.isDate,
  1597. nodeIsMap = nodeUtil && nodeUtil.isMap,
  1598. nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,
  1599. nodeIsSet = nodeUtil && nodeUtil.isSet,
  1600. nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;
  1601. /*--------------------------------------------------------------------------*/
  1602. /**
  1603. * A faster alternative to `Function#apply`, this function invokes `func`
  1604. * with the `this` binding of `thisArg` and the arguments of `args`.
  1605. *
  1606. * @private
  1607. * @param {Function} func The function to invoke.
  1608. * @param {*} thisArg The `this` binding of `func`.
  1609. * @param {Array} args The arguments to invoke `func` with.
  1610. * @returns {*} Returns the result of `func`.
  1611. */
  1612. function apply(func, thisArg, args) {
  1613. switch (args.length) {
  1614. case 0: return func.call(thisArg);
  1615. case 1: return func.call(thisArg, args[0]);
  1616. case 2: return func.call(thisArg, args[0], args[1]);
  1617. case 3: return func.call(thisArg, args[0], args[1], args[2]);
  1618. }
  1619. return func.apply(thisArg, args);
  1620. }
  1621. /**
  1622. * A specialized version of `baseAggregator` for arrays.
  1623. *
  1624. * @private
  1625. * @param {Array} [array] The array to iterate over.
  1626. * @param {Function} setter The function to set `accumulator` values.
  1627. * @param {Function} iteratee The iteratee to transform keys.
  1628. * @param {Object} accumulator The initial aggregated object.
  1629. * @returns {Function} Returns `accumulator`.
  1630. */
  1631. function arrayAggregator(array, setter, iteratee, accumulator) {
  1632. var index = -1,
  1633. length = array == null ? 0 : array.length;
  1634. while (++index < length) {
  1635. var value = array[index];
  1636. setter(accumulator, value, iteratee(value), array);
  1637. }
  1638. return accumulator;
  1639. }
  1640. /**
  1641. * A specialized version of `_.forEach` for arrays without support for
  1642. * iteratee shorthands.
  1643. *
  1644. * @private
  1645. * @param {Array} [array] The array to iterate over.
  1646. * @param {Function} iteratee The function invoked per iteration.
  1647. * @returns {Array} Returns `array`.
  1648. */
  1649. function arrayEach(array, iteratee) {
  1650. var index = -1,
  1651. length = array == null ? 0 : array.length;
  1652. while (++index < length) {
  1653. if (iteratee(array[index], index, array) === false) {
  1654. break;
  1655. }
  1656. }
  1657. return array;
  1658. }
  1659. /**
  1660. * A specialized version of `_.forEachRight` for arrays without support for
  1661. * iteratee shorthands.
  1662. *
  1663. * @private
  1664. * @param {Array} [array] The array to iterate over.
  1665. * @param {Function} iteratee The function invoked per iteration.
  1666. * @returns {Array} Returns `array`.
  1667. */
  1668. function arrayEachRight(array, iteratee) {
  1669. var length = array == null ? 0 : array.length;
  1670. while (length--) {
  1671. if (iteratee(array[length], length, array) === false) {
  1672. break;
  1673. }
  1674. }
  1675. return array;
  1676. }
  1677. /**
  1678. * A specialized version of `_.every` for arrays without support for
  1679. * iteratee shorthands.
  1680. *
  1681. * @private
  1682. * @param {Array} [array] The array to iterate over.
  1683. * @param {Function} predicate The function invoked per iteration.
  1684. * @returns {boolean} Returns `true` if all elements pass the predicate check,
  1685. * else `false`.
  1686. */
  1687. function arrayEvery(array, predicate) {
  1688. var index = -1,
  1689. length = array == null ? 0 : array.length;
  1690. while (++index < length) {
  1691. if (!predicate(array[index], index, array)) {
  1692. return false;
  1693. }
  1694. }
  1695. return true;
  1696. }
  1697. /**
  1698. * A specialized version of `_.filter` for arrays without support for
  1699. * iteratee shorthands.
  1700. *
  1701. * @private
  1702. * @param {Array} [array] The array to iterate over.
  1703. * @param {Function} predicate The function invoked per iteration.
  1704. * @returns {Array} Returns the new filtered array.
  1705. */
  1706. function arrayFilter(array, predicate) {
  1707. var index = -1,
  1708. length = array == null ? 0 : array.length,
  1709. resIndex = 0,
  1710. result = [];
  1711. while (++index < length) {
  1712. var value = array[index];
  1713. if (predicate(value, index, array)) {
  1714. result[resIndex++] = value;
  1715. }
  1716. }
  1717. return result;
  1718. }
  1719. /**
  1720. * A specialized version of `_.includes` for arrays without support for
  1721. * specifying an index to search from.
  1722. *
  1723. * @private
  1724. * @param {Array} [array] The array to inspect.
  1725. * @param {*} target The value to search for.
  1726. * @returns {boolean} Returns `true` if `target` is found, else `false`.
  1727. */
  1728. function arrayIncludes(array, value) {
  1729. var length = array == null ? 0 : array.length;
  1730. return !!length && baseIndexOf(array, value, 0) > -1;
  1731. }
  1732. /**
  1733. * This function is like `arrayIncludes` except that it accepts a comparator.
  1734. *
  1735. * @private
  1736. * @param {Array} [array] The array to inspect.
  1737. * @param {*} target The value to search for.
  1738. * @param {Function} comparator The comparator invoked per element.
  1739. * @returns {boolean} Returns `true` if `target` is found, else `false`.
  1740. */
  1741. function arrayIncludesWith(array, value, comparator) {
  1742. var index = -1,
  1743. length = array == null ? 0 : array.length;
  1744. while (++index < length) {
  1745. if (comparator(value, array[index])) {
  1746. return true;
  1747. }
  1748. }
  1749. return false;
  1750. }
  1751. /**
  1752. * A specialized version of `_.map` for arrays without support for iteratee
  1753. * shorthands.
  1754. *
  1755. * @private
  1756. * @param {Array} [array] The array to iterate over.
  1757. * @param {Function} iteratee The function invoked per iteration.
  1758. * @returns {Array} Returns the new mapped array.
  1759. */
  1760. function arrayMap(array, iteratee) {
  1761. var index = -1,
  1762. length = array == null ? 0 : array.length,
  1763. result = Array(length);
  1764. while (++index < length) {
  1765. result[index] = iteratee(array[index], index, array);
  1766. }
  1767. return result;
  1768. }
  1769. /**
  1770. * Appends the elements of `values` to `array`.
  1771. *
  1772. * @private
  1773. * @param {Array} array The array to modify.
  1774. * @param {Array} values The values to append.
  1775. * @returns {Array} Returns `array`.
  1776. */
  1777. function arrayPush(array, values) {
  1778. var index = -1,
  1779. length = values.length,
  1780. offset = array.length;
  1781. while (++index < length) {
  1782. array[offset + index] = values[index];
  1783. }
  1784. return array;
  1785. }
  1786. /**
  1787. * A specialized version of `_.reduce` for arrays without support for
  1788. * iteratee shorthands.
  1789. *
  1790. * @private
  1791. * @param {Array} [array] The array to iterate over.
  1792. * @param {Function} iteratee The function invoked per iteration.
  1793. * @param {*} [accumulator] The initial value.
  1794. * @param {boolean} [initAccum] Specify using the first element of `array` as
  1795. * the initial value.
  1796. * @returns {*} Returns the accumulated value.
  1797. */
  1798. function arrayReduce(array, iteratee, accumulator, initAccum) {
  1799. var index = -1,
  1800. length = array == null ? 0 : array.length;
  1801. if (initAccum && length) {
  1802. accumulator = array[++index];
  1803. }
  1804. while (++index < length) {
  1805. accumulator = iteratee(accumulator, array[index], index, array);
  1806. }
  1807. return accumulator;
  1808. }
  1809. /**
  1810. * A specialized version of `_.reduceRight` for arrays without support for
  1811. * iteratee shorthands.
  1812. *
  1813. * @private
  1814. * @param {Array} [array] The array to iterate over.
  1815. * @param {Function} iteratee The function invoked per iteration.
  1816. * @param {*} [accumulator] The initial value.
  1817. * @param {boolean} [initAccum] Specify using the last element of `array` as
  1818. * the initial value.
  1819. * @returns {*} Returns the accumulated value.
  1820. */
  1821. function arrayReduceRight(array, iteratee, accumulator, initAccum) {
  1822. var length = array == null ? 0 : array.length;
  1823. if (initAccum && length) {
  1824. accumulator = array[--length];
  1825. }
  1826. while (length--) {
  1827. accumulator = iteratee(accumulator, array[length], length, array);
  1828. }
  1829. return accumulator;
  1830. }
  1831. /**
  1832. * A specialized version of `_.some` for arrays without support for iteratee
  1833. * shorthands.
  1834. *
  1835. * @private
  1836. * @param {Array} [array] The array to iterate over.
  1837. * @param {Function} predicate The function invoked per iteration.
  1838. * @returns {boolean} Returns `true` if any element passes the predicate check,
  1839. * else `false`.
  1840. */
  1841. function arraySome(array, predicate) {
  1842. var index = -1,
  1843. length = array == null ? 0 : array.length;
  1844. while (++index < length) {
  1845. if (predicate(array[index], index, array)) {
  1846. return true;
  1847. }
  1848. }
  1849. return false;
  1850. }
  1851. /**
  1852. * Gets the size of an ASCII `string`.
  1853. *
  1854. * @private
  1855. * @param {string} string The string inspect.
  1856. * @returns {number} Returns the string size.
  1857. */
  1858. var asciiSize = baseProperty('length');
  1859. /**
  1860. * Converts an ASCII `string` to an array.
  1861. *
  1862. * @private
  1863. * @param {string} string The string to convert.
  1864. * @returns {Array} Returns the converted array.
  1865. */
  1866. function asciiToArray(string) {
  1867. return string.split('');
  1868. }
  1869. /**
  1870. * Splits an ASCII `string` into an array of its words.
  1871. *
  1872. * @private
  1873. * @param {string} The string to inspect.
  1874. * @returns {Array} Returns the words of `string`.
  1875. */
  1876. function asciiWords(string) {
  1877. return string.match(reAsciiWord) || [];
  1878. }
  1879. /**
  1880. * The base implementation of methods like `_.findKey` and `_.findLastKey`,
  1881. * without support for iteratee shorthands, which iterates over `collection`
  1882. * using `eachFunc`.
  1883. *
  1884. * @private
  1885. * @param {Array|Object} collection The collection to inspect.
  1886. * @param {Function} predicate The function invoked per iteration.
  1887. * @param {Function} eachFunc The function to iterate over `collection`.
  1888. * @returns {*} Returns the found element or its key, else `undefined`.
  1889. */
  1890. function baseFindKey(collection, predicate, eachFunc) {
  1891. var result;
  1892. eachFunc(collection, function(value, key, collection) {
  1893. if (predicate(value, key, collection)) {
  1894. result = key;
  1895. return false;
  1896. }
  1897. });
  1898. return result;
  1899. }
  1900. /**
  1901. * The base implementation of `_.findIndex` and `_.findLastIndex` without
  1902. * support for iteratee shorthands.
  1903. *
  1904. * @private
  1905. * @param {Array} array The array to inspect.
  1906. * @param {Function} predicate The function invoked per iteration.
  1907. * @param {number} fromIndex The index to search from.
  1908. * @param {boolean} [fromRight] Specify iterating from right to left.
  1909. * @returns {number} Returns the index of the matched value, else `-1`.
  1910. */
  1911. function baseFindIndex(array, predicate, fromIndex, fromRight) {
  1912. var length = array.length,
  1913. index = fromIndex + (fromRight ? 1 : -1);
  1914. while ((fromRight ? index-- : ++index < length)) {
  1915. if (predicate(array[index], index, array)) {
  1916. return index;
  1917. }
  1918. }
  1919. return -1;
  1920. }
  1921. /**
  1922. * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
  1923. *
  1924. * @private
  1925. * @param {Array} array The array to inspect.
  1926. * @param {*} value The value to search for.
  1927. * @param {number} fromIndex The index to search from.
  1928. * @returns {number} Returns the index of the matched value, else `-1`.
  1929. */
  1930. function baseIndexOf(array, value, fromIndex) {
  1931. return value === value
  1932. ? strictIndexOf(array, value, fromIndex)
  1933. : baseFindIndex(array, baseIsNaN, fromIndex);
  1934. }
  1935. /**
  1936. * This function is like `baseIndexOf` except that it accepts a comparator.
  1937. *
  1938. * @private
  1939. * @param {Array} array The array to inspect.
  1940. * @param {*} value The value to search for.
  1941. * @param {number} fromIndex The index to search from.
  1942. * @param {Function} comparator The comparator invoked per element.
  1943. * @returns {number} Returns the index of the matched value, else `-1`.
  1944. */
  1945. function baseIndexOfWith(array, value, fromIndex, comparator) {
  1946. var index = fromIndex - 1,
  1947. length = array.length;
  1948. while (++index < length) {
  1949. if (comparator(array[index], value)) {
  1950. return index;
  1951. }
  1952. }
  1953. return -1;
  1954. }
  1955. /**
  1956. * The base implementation of `_.isNaN` without support for number objects.
  1957. *
  1958. * @private
  1959. * @param {*} value The value to check.
  1960. * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
  1961. */
  1962. function baseIsNaN(value) {
  1963. return value !== value;
  1964. }
  1965. /**
  1966. * The base implementation of `_.mean` and `_.meanBy` without support for
  1967. * iteratee shorthands.
  1968. *
  1969. * @private
  1970. * @param {Array} array The array to iterate over.
  1971. * @param {Function} iteratee The function invoked per iteration.
  1972. * @returns {number} Returns the mean.
  1973. */
  1974. function baseMean(array, iteratee) {
  1975. var length = array == null ? 0 : array.length;
  1976. return length ? (baseSum(array, iteratee) / length) : NAN;
  1977. }
  1978. /**
  1979. * The base implementation of `_.property` without support for deep paths.
  1980. *
  1981. * @private
  1982. * @param {string} key The key of the property to get.
  1983. * @returns {Function} Returns the new accessor function.
  1984. */
  1985. function baseProperty(key) {
  1986. return function(object) {
  1987. return object == null ? undefined : object[key];
  1988. };
  1989. }
  1990. /**
  1991. * The base implementation of `_.propertyOf` without support for deep paths.
  1992. *
  1993. * @private
  1994. * @param {Object} object The object to query.
  1995. * @returns {Function} Returns the new accessor function.
  1996. */
  1997. function basePropertyOf(object) {
  1998. return function(key) {
  1999. return object == null ? undefined : object[key];
  2000. };
  2001. }
  2002. /**
  2003. * The base implementation of `_.reduce` and `_.reduceRight`, without support
  2004. * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
  2005. *
  2006. * @private
  2007. * @param {Array|Object} collection The collection to iterate over.
  2008. * @param {Function} iteratee The function invoked per iteration.
  2009. * @param {*} accumulator The initial value.
  2010. * @param {boolean} initAccum Specify using the first or last element of
  2011. * `collection` as the initial value.
  2012. * @param {Function} eachFunc The function to iterate over `collection`.
  2013. * @returns {*} Returns the accumulated value.
  2014. */
  2015. function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
  2016. eachFunc(collection, function(value, index, collection) {
  2017. accumulator = initAccum
  2018. ? (initAccum = false, value)
  2019. : iteratee(accumulator, value, index, collection);
  2020. });
  2021. return accumulator;
  2022. }
  2023. /**
  2024. * The base implementation of `_.sortBy` which uses `comparer` to define the
  2025. * sort order of `array` and replaces criteria objects with their corresponding
  2026. * values.
  2027. *
  2028. * @private
  2029. * @param {Array} array The array to sort.
  2030. * @param {Function} comparer The function to define sort order.
  2031. * @returns {Array} Returns `array`.
  2032. */
  2033. function baseSortBy(array, comparer) {
  2034. var length = array.length;
  2035. array.sort(comparer);
  2036. while (length--) {
  2037. array[length] = array[length].value;
  2038. }
  2039. return array;
  2040. }
  2041. /**
  2042. * The base implementation of `_.sum` and `_.sumBy` without support for
  2043. * iteratee shorthands.
  2044. *
  2045. * @private
  2046. * @param {Array} array The array to iterate over.
  2047. * @param {Function} iteratee The function invoked per iteration.
  2048. * @returns {number} Returns the sum.
  2049. */
  2050. function baseSum(array, iteratee) {
  2051. var result,
  2052. index = -1,
  2053. length = array.length;
  2054. while (++index < length) {
  2055. var current = iteratee(array[index]);
  2056. if (current !== undefined) {
  2057. result = result === undefined ? current : (result + current);
  2058. }
  2059. }
  2060. return result;
  2061. }
  2062. /**
  2063. * The base implementation of `_.times` without support for iteratee shorthands
  2064. * or max array length checks.
  2065. *
  2066. * @private
  2067. * @param {number} n The number of times to invoke `iteratee`.
  2068. * @param {Function} iteratee The function invoked per iteration.
  2069. * @returns {Array} Returns the array of results.
  2070. */
  2071. function baseTimes(n, iteratee) {
  2072. var index = -1,
  2073. result = Array(n);
  2074. while (++index < n) {
  2075. result[index] = iteratee(index);
  2076. }
  2077. return result;
  2078. }
  2079. /**
  2080. * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
  2081. * of key-value pairs for `object` corresponding to the property names of `props`.
  2082. *
  2083. * @private
  2084. * @param {Object} object The object to query.
  2085. * @param {Array} props The property names to get values for.
  2086. * @returns {Object} Returns the key-value pairs.
  2087. */
  2088. function baseToPairs(object, props) {
  2089. return arrayMap(props, function(key) {
  2090. return [key, object[key]];
  2091. });
  2092. }
  2093. /**
  2094. * The base implementation of `_.unary` without support for storing metadata.
  2095. *
  2096. * @private
  2097. * @param {Function} func The function to cap arguments for.
  2098. * @returns {Function} Returns the new capped function.
  2099. */
  2100. function baseUnary(func) {
  2101. return function(value) {
  2102. return func(value);
  2103. };
  2104. }
  2105. /**
  2106. * The base implementation of `_.values` and `_.valuesIn` which creates an
  2107. * array of `object` property values corresponding to the property names
  2108. * of `props`.
  2109. *
  2110. * @private
  2111. * @param {Object} object The object to query.
  2112. * @param {Array} props The property names to get values for.
  2113. * @returns {Object} Returns the array of property values.
  2114. */
  2115. function baseValues(object, props) {
  2116. return arrayMap(props, function(key) {
  2117. return object[key];
  2118. });
  2119. }
  2120. /**
  2121. * Checks if a `cache` value for `key` exists.
  2122. *
  2123. * @private
  2124. * @param {Object} cache The cache to query.
  2125. * @param {string} key The key of the entry to check.
  2126. * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  2127. */
  2128. function cacheHas(cache, key) {
  2129. return cache.has(key);
  2130. }
  2131. /**
  2132. * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
  2133. * that is not found in the character symbols.
  2134. *
  2135. * @private
  2136. * @param {Array} strSymbols The string symbols to inspect.
  2137. * @param {Array} chrSymbols The character symbols to find.
  2138. * @returns {number} Returns the index of the first unmatched string symbol.
  2139. */
  2140. function charsStartIndex(strSymbols, chrSymbols) {
  2141. var index = -1,
  2142. length = strSymbols.length;
  2143. while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
  2144. return index;
  2145. }
  2146. /**
  2147. * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
  2148. * that is not found in the character symbols.
  2149. *
  2150. * @private
  2151. * @param {Array} strSymbols The string symbols to inspect.
  2152. * @param {Array} chrSymbols The character symbols to find.
  2153. * @returns {number} Returns the index of the last unmatched string symbol.
  2154. */
  2155. function charsEndIndex(strSymbols, chrSymbols) {
  2156. var index = strSymbols.length;
  2157. while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
  2158. return index;
  2159. }
  2160. /**
  2161. * Gets the number of `placeholder` occurrences in `array`.
  2162. *
  2163. * @private
  2164. * @param {Array} array The array to inspect.
  2165. * @param {*} placeholder The placeholder to search for.
  2166. * @returns {number} Returns the placeholder count.
  2167. */
  2168. function countHolders(array, placeholder) {
  2169. var length = array.length,
  2170. result = 0;
  2171. while (length--) {
  2172. if (array[length] === placeholder) {
  2173. ++result;
  2174. }
  2175. }
  2176. return result;
  2177. }
  2178. /**
  2179. * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
  2180. * letters to basic Latin letters.
  2181. *
  2182. * @private
  2183. * @param {string} letter The matched letter to deburr.
  2184. * @returns {string} Returns the deburred letter.
  2185. */
  2186. var deburrLetter = basePropertyOf(deburredLetters);
  2187. /**
  2188. * Used by `_.escape` to convert characters to HTML entities.
  2189. *
  2190. * @private
  2191. * @param {string} chr The matched character to escape.
  2192. * @returns {string} Returns the escaped character.
  2193. */
  2194. var escapeHtmlChar = basePropertyOf(htmlEscapes);
  2195. /**
  2196. * Used by `_.template` to escape characters for inclusion in compiled string literals.
  2197. *
  2198. * @private
  2199. * @param {string} chr The matched character to escape.
  2200. * @returns {string} Returns the escaped character.
  2201. */
  2202. function escapeStringChar(chr) {
  2203. return '\\' + stringEscapes[chr];
  2204. }
  2205. /**
  2206. * Gets the value at `key` of `object`.
  2207. *
  2208. * @private
  2209. * @param {Object} [object] The object to query.
  2210. * @param {string} key The key of the property to get.
  2211. * @returns {*} Returns the property value.
  2212. */
  2213. function getValue(object, key) {
  2214. return object == null ? undefined : object[key];
  2215. }
  2216. /**
  2217. * Checks if `string` contains Unicode symbols.
  2218. *
  2219. * @private
  2220. * @param {string} string The string to inspect.
  2221. * @returns {boolean} Returns `true` if a symbol is found, else `false`.
  2222. */
  2223. function hasUnicode(string) {
  2224. return reHasUnicode.test(string);
  2225. }
  2226. /**
  2227. * Checks if `string` contains a word composed of Unicode symbols.
  2228. *
  2229. * @private
  2230. * @param {string} string The string to inspect.
  2231. * @returns {boolean} Returns `true` if a word is found, else `false`.
  2232. */
  2233. function hasUnicodeWord(string) {
  2234. return reHasUnicodeWord.test(string);
  2235. }
  2236. /**
  2237. * Converts `iterator` to an array.
  2238. *
  2239. * @private
  2240. * @param {Object} iterator The iterator to convert.
  2241. * @returns {Array} Returns the converted array.
  2242. */
  2243. function iteratorToArray(iterator) {
  2244. var data,
  2245. result = [];
  2246. while (!(data = iterator.next()).done) {
  2247. result.push(data.value);
  2248. }
  2249. return result;
  2250. }
  2251. /**
  2252. * Converts `map` to its key-value pairs.
  2253. *
  2254. * @private
  2255. * @param {Object} map The map to convert.
  2256. * @returns {Array} Returns the key-value pairs.
  2257. */
  2258. function mapToArray(map) {
  2259. var index = -1,
  2260. result = Array(map.size);
  2261. map.forEach(function(value, key) {
  2262. result[++index] = [key, value];
  2263. });
  2264. return result;
  2265. }
  2266. /**
  2267. * Creates a unary function that invokes `func` with its argument transformed.
  2268. *
  2269. * @private
  2270. * @param {Function} func The function to wrap.
  2271. * @param {Function} transform The argument transform.
  2272. * @returns {Function} Returns the new function.
  2273. */
  2274. function overArg(func, transform) {
  2275. return function(arg) {
  2276. return func(transform(arg));
  2277. };
  2278. }
  2279. /**
  2280. * Replaces all `placeholder` elements in `array` with an internal placeholder
  2281. * and returns an array of their indexes.
  2282. *
  2283. * @private
  2284. * @param {Array} array The array to modify.
  2285. * @param {*} placeholder The placeholder to replace.
  2286. * @returns {Array} Returns the new array of placeholder indexes.
  2287. */
  2288. function replaceHolders(array, placeholder) {
  2289. var index = -1,
  2290. length = array.length,
  2291. resIndex = 0,
  2292. result = [];
  2293. while (++index < length) {
  2294. var value = array[index];
  2295. if (value === placeholder || value === PLACEHOLDER) {
  2296. array[index] = PLACEHOLDER;
  2297. result[resIndex++] = index;
  2298. }
  2299. }
  2300. return result;
  2301. }
  2302. /**
  2303. * Converts `set` to an array of its values.
  2304. *
  2305. * @private
  2306. * @param {Object} set The set to convert.
  2307. * @returns {Array} Returns the values.
  2308. */
  2309. function setToArray(set) {
  2310. var index = -1,
  2311. result = Array(set.size);
  2312. set.forEach(function(value) {
  2313. result[++index] = value;
  2314. });
  2315. return result;
  2316. }
  2317. /**
  2318. * Converts `set` to its value-value pairs.
  2319. *
  2320. * @private
  2321. * @param {Object} set The set to convert.
  2322. * @returns {Array} Returns the value-value pairs.
  2323. */
  2324. function setToPairs(set) {
  2325. var index = -1,
  2326. result = Array(set.size);
  2327. set.forEach(function(value) {
  2328. result[++index] = [value, value];
  2329. });
  2330. return result;
  2331. }
  2332. /**
  2333. * A specialized version of `_.indexOf` which performs strict equality
  2334. * comparisons of values, i.e. `===`.
  2335. *
  2336. * @private
  2337. * @param {Array} array The array to inspect.
  2338. * @param {*} value The value to search for.
  2339. * @param {number} fromIndex The index to search from.
  2340. * @returns {number} Returns the index of the matched value, else `-1`.
  2341. */
  2342. function strictIndexOf(array, value, fromIndex) {
  2343. var index = fromIndex - 1,
  2344. length = array.length;
  2345. while (++index < length) {
  2346. if (array[index] === value) {
  2347. return index;
  2348. }
  2349. }
  2350. return -1;
  2351. }
  2352. /**
  2353. * A specialized version of `_.lastIndexOf` which performs strict equality
  2354. * comparisons of values, i.e. `===`.
  2355. *
  2356. * @private
  2357. * @param {Array} array The array to inspect.
  2358. * @param {*} value The value to search for.
  2359. * @param {number} fromIndex The index to search from.
  2360. * @returns {number} Returns the index of the matched value, else `-1`.
  2361. */
  2362. function strictLastIndexOf(array, value, fromIndex) {
  2363. var index = fromIndex + 1;
  2364. while (index--) {
  2365. if (array[index] === value) {
  2366. return index;
  2367. }
  2368. }
  2369. return index;
  2370. }
  2371. /**
  2372. * Gets the number of symbols in `string`.
  2373. *
  2374. * @private
  2375. * @param {string} string The string to inspect.
  2376. * @returns {number} Returns the string size.
  2377. */
  2378. function stringSize(string) {
  2379. return hasUnicode(string)
  2380. ? unicodeSize(string)
  2381. : asciiSize(string);
  2382. }
  2383. /**
  2384. * Converts `string` to an array.
  2385. *
  2386. * @private
  2387. * @param {string} string The string to convert.
  2388. * @returns {Array} Returns the converted array.
  2389. */
  2390. function stringToArray(string) {
  2391. return hasUnicode(string)
  2392. ? unicodeToArray(string)
  2393. : asciiToArray(string);
  2394. }
  2395. /**
  2396. * Used by `_.unescape` to convert HTML entities to characters.
  2397. *
  2398. * @private
  2399. * @param {string} chr The matched character to unescape.
  2400. * @returns {string} Returns the unescaped character.
  2401. */
  2402. var unescapeHtmlChar = basePropertyOf(htmlUnescapes);
  2403. /**
  2404. * Gets the size of a Unicode `string`.
  2405. *
  2406. * @private
  2407. * @param {string} string The string inspect.
  2408. * @returns {number} Returns the string size.
  2409. */
  2410. function unicodeSize(string) {
  2411. var result = reUnicode.lastIndex = 0;
  2412. while (reUnicode.test(string)) {
  2413. ++result;
  2414. }
  2415. return result;
  2416. }
  2417. /**
  2418. * Converts a Unicode `string` to an array.
  2419. *
  2420. * @private
  2421. * @param {string} string The string to convert.
  2422. * @returns {Array} Returns the converted array.
  2423. */
  2424. function unicodeToArray(string) {
  2425. return string.match(reUnicode) || [];
  2426. }
  2427. /**
  2428. * Splits a Unicode `string` into an array of its words.
  2429. *
  2430. * @private
  2431. * @param {string} The string to inspect.
  2432. * @returns {Array} Returns the words of `string`.
  2433. */
  2434. function unicodeWords(string) {
  2435. return string.match(reUnicodeWord) || [];
  2436. }
  2437. /*--------------------------------------------------------------------------*/
  2438. /**
  2439. * Create a new pristine `lodash` function using the `context` object.
  2440. *
  2441. * @static
  2442. * @memberOf _
  2443. * @since 1.1.0
  2444. * @category Util
  2445. * @param {Object} [context=root] The context object.
  2446. * @returns {Function} Returns a new `lodash` function.
  2447. * @example
  2448. *
  2449. * _.mixin({ 'foo': _.constant('foo') });
  2450. *
  2451. * var lodash = _.runInContext();
  2452. * lodash.mixin({ 'bar': lodash.constant('bar') });
  2453. *
  2454. * _.isFunction(_.foo);
  2455. * // => true
  2456. * _.isFunction(_.bar);
  2457. * // => false
  2458. *
  2459. * lodash.isFunction(lodash.foo);
  2460. * // => false
  2461. * lodash.isFunction(lodash.bar);
  2462. * // => true
  2463. *
  2464. * // Create a suped-up `defer` in Node.js.
  2465. * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
  2466. */
  2467. var runInContext = (function runInContext(context) {
  2468. context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));
  2469. /** Built-in constructor references. */
  2470. var Array = context.Array,
  2471. Date = context.Date,
  2472. Error = context.Error,
  2473. Function = context.Function,
  2474. Math = context.Math,
  2475. Object = context.Object,
  2476. RegExp = context.RegExp,
  2477. String = context.String,
  2478. TypeError = context.TypeError;
  2479. /** Used for built-in method references. */
  2480. var arrayProto = Array.prototype,
  2481. funcProto = Function.prototype,
  2482. objectProto = Object.prototype;
  2483. /** Used to detect overreaching core-js shims. */
  2484. var coreJsData = context['__core-js_shared__'];
  2485. /** Used to resolve the decompiled source of functions. */
  2486. var funcToString = funcProto.toString;
  2487. /** Used to check objects for own properties. */
  2488. var hasOwnProperty = objectProto.hasOwnProperty;
  2489. /** Used to generate unique IDs. */
  2490. var idCounter = 0;
  2491. /** Used to detect methods masquerading as native. */
  2492. var maskSrcKey = (function() {
  2493. var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
  2494. return uid ? ('Symbol(src)_1.' + uid) : '';
  2495. }());
  2496. /**
  2497. * Used to resolve the
  2498. * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
  2499. * of values.
  2500. */
  2501. var nativeObjectToString = objectProto.toString;
  2502. /** Used to infer the `Object` constructor. */
  2503. var objectCtorString = funcToString.call(Object);
  2504. /** Used to restore the original `_` reference in `_.noConflict`. */
  2505. var oldDash = root._;
  2506. /** Used to detect if a method is native. */
  2507. var reIsNative = RegExp('^' +
  2508. funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
  2509. .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
  2510. );
  2511. /** Built-in value references. */
  2512. var Buffer = moduleExports ? context.Buffer : undefined,
  2513. Symbol = context.Symbol,
  2514. Uint8Array = context.Uint8Array,
  2515. allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
  2516. getPrototype = overArg(Object.getPrototypeOf, Object),
  2517. objectCreate = Object.create,
  2518. propertyIsEnumerable = objectProto.propertyIsEnumerable,
  2519. splice = arrayProto.splice,
  2520. spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
  2521. symIterator = Symbol ? Symbol.iterator : undefined,
  2522. symToStringTag = Symbol ? Symbol.toStringTag : undefined;
  2523. var defineProperty = (function() {
  2524. try {
  2525. var func = getNative(Object, 'defineProperty');
  2526. func({}, '', {});
  2527. return func;
  2528. } catch (e) {}
  2529. }());
  2530. /** Mocked built-ins. */
  2531. var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
  2532. ctxNow = Date && Date.now !== root.Date.now && Date.now,
  2533. ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;
  2534. /* Built-in method references for those with the same name as other `lodash` methods. */
  2535. var nativeCeil = Math.ceil,
  2536. nativeFloor = Math.floor,
  2537. nativeGetSymbols = Object.getOwnPropertySymbols,
  2538. nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
  2539. nativeIsFinite = context.isFinite,
  2540. nativeJoin = arrayProto.join,
  2541. nativeKeys = overArg(Object.keys, Object),
  2542. nativeMax = Math.max,
  2543. nativeMin = Math.min,
  2544. nativeNow = Date.now,
  2545. nativeParseInt = context.parseInt,
  2546. nativeRandom = Math.random,
  2547. nativeReverse = arrayProto.reverse;
  2548. /* Built-in method references that are verified to be native. */
  2549. var DataView = getNative(context, 'DataView'),
  2550. Map = getNative(context, 'Map'),
  2551. Promise = getNative(context, 'Promise'),
  2552. Set = getNative(context, 'Set'),
  2553. WeakMap = getNative(context, 'WeakMap'),
  2554. nativeCreate = getNative(Object, 'create');
  2555. /** Used to store function metadata. */
  2556. var metaMap = WeakMap && new WeakMap;
  2557. /** Used to lookup unminified function names. */
  2558. var realNames = {};
  2559. /** Used to detect maps, sets, and weakmaps. */
  2560. var dataViewCtorString = toSource(DataView),
  2561. mapCtorString = toSource(Map),
  2562. promiseCtorString = toSource(Promise),
  2563. setCtorString = toSource(Set),
  2564. weakMapCtorString = toSource(WeakMap);
  2565. /** Used to convert symbols to primitives and strings. */
  2566. var symbolProto = Symbol ? Symbol.prototype : undefined,
  2567. symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
  2568. symbolToString = symbolProto ? symbolProto.toString : undefined;
  2569. /*------------------------------------------------------------------------*/
  2570. /**
  2571. * Creates a `lodash` object which wraps `value` to enable implicit method
  2572. * chain sequences. Methods that operate on and return arrays, collections,
  2573. * and functions can be chained together. Methods that retrieve a single value
  2574. * or may return a primitive value will automatically end the chain sequence
  2575. * and return the unwrapped value. Otherwise, the value must be unwrapped
  2576. * with `_#value`.
  2577. *
  2578. * Explicit chain sequences, which must be unwrapped with `_#value`, may be
  2579. * enabled using `_.chain`.
  2580. *
  2581. * The execution of chained methods is lazy, that is, it's deferred until
  2582. * `_#value` is implicitly or explicitly called.
  2583. *
  2584. * Lazy evaluation allows several methods to support shortcut fusion.
  2585. * Shortcut fusion is an optimization to merge iteratee calls; this avoids
  2586. * the creation of intermediate arrays and can greatly reduce the number of
  2587. * iteratee executions. Sections of a chain sequence qualify for shortcut
  2588. * fusion if the section is applied to an array and iteratees accept only
  2589. * one argument. The heuristic for whether a section qualifies for shortcut
  2590. * fusion is subject to change.
  2591. *
  2592. * Chaining is supported in custom builds as long as the `_#value` method is
  2593. * directly or indirectly included in the build.
  2594. *
  2595. * In addition to lodash methods, wrappers have `Array` and `String` methods.
  2596. *
  2597. * The wrapper `Array` methods are:
  2598. * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
  2599. *
  2600. * The wrapper `String` methods are:
  2601. * `replace` and `split`
  2602. *
  2603. * The wrapper methods that support shortcut fusion are:
  2604. * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
  2605. * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
  2606. * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
  2607. *
  2608. * The chainable wrapper methods are:
  2609. * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
  2610. * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
  2611. * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
  2612. * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
  2613. * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
  2614. * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
  2615. * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
  2616. * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
  2617. * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
  2618. * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
  2619. * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
  2620. * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
  2621. * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
  2622. * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
  2623. * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
  2624. * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
  2625. * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
  2626. * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
  2627. * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
  2628. * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
  2629. * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
  2630. * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
  2631. * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
  2632. * `zipObject`, `zipObjectDeep`, and `zipWith`
  2633. *
  2634. * The wrapper methods that are **not** chainable by default are:
  2635. * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
  2636. * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
  2637. * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
  2638. * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
  2639. * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
  2640. * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
  2641. * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
  2642. * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
  2643. * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
  2644. * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
  2645. * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
  2646. * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
  2647. * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
  2648. * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
  2649. * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
  2650. * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
  2651. * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
  2652. * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
  2653. * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
  2654. * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
  2655. * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
  2656. * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
  2657. * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
  2658. * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
  2659. * `upperFirst`, `value`, and `words`
  2660. *
  2661. * @name _
  2662. * @constructor
  2663. * @category Seq
  2664. * @param {*} value The value to wrap in a `lodash` instance.
  2665. * @returns {Object} Returns the new `lodash` wrapper instance.
  2666. * @example
  2667. *
  2668. * function square(n) {
  2669. * return n * n;
  2670. * }
  2671. *
  2672. * var wrapped = _([1, 2, 3]);
  2673. *
  2674. * // Returns an unwrapped value.
  2675. * wrapped.reduce(_.add);
  2676. * // => 6
  2677. *
  2678. * // Returns a wrapped value.
  2679. * var squares = wrapped.map(square);
  2680. *
  2681. * _.isArray(squares);
  2682. * // => false
  2683. *
  2684. * _.isArray(squares.value());
  2685. * // => true
  2686. */
  2687. function lodash(value) {
  2688. if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
  2689. if (value instanceof LodashWrapper) {
  2690. return value;
  2691. }
  2692. if (hasOwnProperty.call(value, '__wrapped__')) {
  2693. return wrapperClone(value);
  2694. }
  2695. }
  2696. return new LodashWrapper(value);
  2697. }
  2698. /**
  2699. * The base implementation of `_.create` without support for assigning
  2700. * properties to the created object.
  2701. *
  2702. * @private
  2703. * @param {Object} proto The object to inherit from.
  2704. * @returns {Object} Returns the new object.
  2705. */
  2706. var baseCreate = (function() {
  2707. function object() {}
  2708. return function(proto) {
  2709. if (!isObject(proto)) {
  2710. return {};
  2711. }
  2712. if (objectCreate) {
  2713. return objectCreate(proto);
  2714. }
  2715. object.prototype = proto;
  2716. var result = new object;
  2717. object.prototype = undefined;
  2718. return result;
  2719. };
  2720. }());
  2721. /**
  2722. * The function whose prototype chain sequence wrappers inherit from.
  2723. *
  2724. * @private
  2725. */
  2726. function baseLodash() {
  2727. // No operation performed.
  2728. }
  2729. /**
  2730. * The base constructor for creating `lodash` wrapper objects.
  2731. *
  2732. * @private
  2733. * @param {*} value The value to wrap.
  2734. * @param {boolean} [chainAll] Enable explicit method chain sequences.
  2735. */
  2736. function LodashWrapper(value, chainAll) {
  2737. this.__wrapped__ = value;
  2738. this.__actions__ = [];
  2739. this.__chain__ = !!chainAll;
  2740. this.__index__ = 0;
  2741. this.__values__ = undefined;
  2742. }
  2743. /**
  2744. * By default, the template delimiters used by lodash are like those in
  2745. * embedded Ruby (ERB) as well as ES2015 template strings. Change the
  2746. * following template settings to use alternative delimiters.
  2747. *
  2748. * @static
  2749. * @memberOf _
  2750. * @type {Object}
  2751. */
  2752. lodash.templateSettings = {
  2753. /**
  2754. * Used to detect `data` property values to be HTML-escaped.
  2755. *
  2756. * @memberOf _.templateSettings
  2757. * @type {RegExp}
  2758. */
  2759. 'escape': reEscape,
  2760. /**
  2761. * Used to detect code to be evaluated.
  2762. *
  2763. * @memberOf _.templateSettings
  2764. * @type {RegExp}
  2765. */
  2766. 'evaluate': reEvaluate,
  2767. /**
  2768. * Used to detect `data` property values to inject.
  2769. *
  2770. * @memberOf _.templateSettings
  2771. * @type {RegExp}
  2772. */
  2773. 'interpolate': reInterpolate,
  2774. /**
  2775. * Used to reference the data object in the template text.
  2776. *
  2777. * @memberOf _.templateSettings
  2778. * @type {string}
  2779. */
  2780. 'variable': '',
  2781. /**
  2782. * Used to import variables into the compiled template.
  2783. *
  2784. * @memberOf _.templateSettings
  2785. * @type {Object}
  2786. */
  2787. 'imports': {
  2788. /**
  2789. * A reference to the `lodash` function.
  2790. *
  2791. * @memberOf _.templateSettings.imports
  2792. * @type {Function}
  2793. */
  2794. '_': lodash
  2795. }
  2796. };
  2797. // Ensure wrappers are instances of `baseLodash`.
  2798. lodash.prototype = baseLodash.prototype;
  2799. lodash.prototype.constructor = lodash;
  2800. LodashWrapper.prototype = baseCreate(baseLodash.prototype);
  2801. LodashWrapper.prototype.constructor = LodashWrapper;
  2802. /*------------------------------------------------------------------------*/
  2803. /**
  2804. * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
  2805. *
  2806. * @private
  2807. * @constructor
  2808. * @param {*} value The value to wrap.
  2809. */
  2810. function LazyWrapper(value) {
  2811. this.__wrapped__ = value;
  2812. this.__actions__ = [];
  2813. this.__dir__ = 1;
  2814. this.__filtered__ = false;
  2815. this.__iteratees__ = [];
  2816. this.__takeCount__ = MAX_ARRAY_LENGTH;
  2817. this.__views__ = [];
  2818. }
  2819. /**
  2820. * Creates a clone of the lazy wrapper object.
  2821. *
  2822. * @private
  2823. * @name clone
  2824. * @memberOf LazyWrapper
  2825. * @returns {Object} Returns the cloned `LazyWrapper` object.
  2826. */
  2827. function lazyClone() {
  2828. var result = new LazyWrapper(this.__wrapped__);
  2829. result.__actions__ = copyArray(this.__actions__);
  2830. result.__dir__ = this.__dir__;
  2831. result.__filtered__ = this.__filtered__;
  2832. result.__iteratees__ = copyArray(this.__iteratees__);
  2833. result.__takeCount__ = this.__takeCount__;
  2834. result.__views__ = copyArray(this.__views__);
  2835. return result;
  2836. }
  2837. /**
  2838. * Reverses the direction of lazy iteration.
  2839. *
  2840. * @private
  2841. * @name reverse
  2842. * @memberOf LazyWrapper
  2843. * @returns {Object} Returns the new reversed `LazyWrapper` object.
  2844. */
  2845. function lazyReverse() {
  2846. if (this.__filtered__) {
  2847. var result = new LazyWrapper(this);
  2848. result.__dir__ = -1;
  2849. result.__filtered__ = true;
  2850. } else {
  2851. result = this.clone();
  2852. result.__dir__ *= -1;
  2853. }
  2854. return result;
  2855. }
  2856. /**
  2857. * Extracts the unwrapped value from its lazy wrapper.
  2858. *
  2859. * @private
  2860. * @name value
  2861. * @memberOf LazyWrapper
  2862. * @returns {*} Returns the unwrapped value.
  2863. */
  2864. function lazyValue() {
  2865. var array = this.__wrapped__.value(),
  2866. dir = this.__dir__,
  2867. isArr = isArray(array),
  2868. isRight = dir < 0,
  2869. arrLength = isArr ? array.length : 0,
  2870. view = getView(0, arrLength, this.__views__),
  2871. start = view.start,
  2872. end = view.end,
  2873. length = end - start,
  2874. index = isRight ? end : (start - 1),
  2875. iteratees = this.__iteratees__,
  2876. iterLength = iteratees.length,
  2877. resIndex = 0,
  2878. takeCount = nativeMin(length, this.__takeCount__);
  2879. if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
  2880. return baseWrapperValue(array, this.__actions__);
  2881. }
  2882. var result = [];
  2883. outer:
  2884. while (length-- && resIndex < takeCount) {
  2885. index += dir;
  2886. var iterIndex = -1,
  2887. value = array[index];
  2888. while (++iterIndex < iterLength) {
  2889. var data = iteratees[iterIndex],
  2890. iteratee = data.iteratee,
  2891. type = data.type,
  2892. computed = iteratee(value);
  2893. if (type == LAZY_MAP_FLAG) {
  2894. value = computed;
  2895. } else if (!computed) {
  2896. if (type == LAZY_FILTER_FLAG) {
  2897. continue outer;
  2898. } else {
  2899. break outer;
  2900. }
  2901. }
  2902. }
  2903. result[resIndex++] = value;
  2904. }
  2905. return result;
  2906. }
  2907. // Ensure `LazyWrapper` is an instance of `baseLodash`.
  2908. LazyWrapper.prototype = baseCreate(baseLodash.prototype);
  2909. LazyWrapper.prototype.constructor = LazyWrapper;
  2910. /*------------------------------------------------------------------------*/
  2911. /**
  2912. * Creates a hash object.
  2913. *
  2914. * @private
  2915. * @constructor
  2916. * @param {Array} [entries] The key-value pairs to cache.
  2917. */
  2918. function Hash(entries) {
  2919. var index = -1,
  2920. length = entries == null ? 0 : entries.length;
  2921. this.clear();
  2922. while (++index < length) {
  2923. var entry = entries[index];
  2924. this.set(entry[0], entry[1]);
  2925. }
  2926. }
  2927. /**
  2928. * Removes all key-value entries from the hash.
  2929. *
  2930. * @private
  2931. * @name clear
  2932. * @memberOf Hash
  2933. */
  2934. function hashClear() {
  2935. this.__data__ = nativeCreate ? nativeCreate(null) : {};
  2936. this.size = 0;
  2937. }
  2938. /**
  2939. * Removes `key` and its value from the hash.
  2940. *
  2941. * @private
  2942. * @name delete
  2943. * @memberOf Hash
  2944. * @param {Object} hash The hash to modify.
  2945. * @param {string} key The key of the value to remove.
  2946. * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  2947. */
  2948. function hashDelete(key) {
  2949. var result = this.has(key) && delete this.__data__[key];
  2950. this.size -= result ? 1 : 0;
  2951. return result;
  2952. }
  2953. /**
  2954. * Gets the hash value for `key`.
  2955. *
  2956. * @private
  2957. * @name get
  2958. * @memberOf Hash
  2959. * @param {string} key The key of the value to get.
  2960. * @returns {*} Returns the entry value.
  2961. */
  2962. function hashGet(key) {
  2963. var data = this.__data__;
  2964. if (nativeCreate) {
  2965. var result = data[key];
  2966. return result === HASH_UNDEFINED ? undefined : result;
  2967. }
  2968. return hasOwnProperty.call(data, key) ? data[key] : undefined;
  2969. }
  2970. /**
  2971. * Checks if a hash value for `key` exists.
  2972. *
  2973. * @private
  2974. * @name has
  2975. * @memberOf Hash
  2976. * @param {string} key The key of the entry to check.
  2977. * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  2978. */
  2979. function hashHas(key) {
  2980. var data = this.__data__;
  2981. return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
  2982. }
  2983. /**
  2984. * Sets the hash `key` to `value`.
  2985. *
  2986. * @private
  2987. * @name set
  2988. * @memberOf Hash
  2989. * @param {string} key The key of the value to set.
  2990. * @param {*} value The value to set.
  2991. * @returns {Object} Returns the hash instance.
  2992. */
  2993. function hashSet(key, value) {
  2994. var data = this.__data__;
  2995. this.size += this.has(key) ? 0 : 1;
  2996. data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
  2997. return this;
  2998. }
  2999. // Add methods to `Hash`.
  3000. Hash.prototype.clear = hashClear;
  3001. Hash.prototype['delete'] = hashDelete;
  3002. Hash.prototype.get = hashGet;
  3003. Hash.prototype.has = hashHas;
  3004. Hash.prototype.set = hashSet;
  3005. /*------------------------------------------------------------------------*/
  3006. /**
  3007. * Creates an list cache object.
  3008. *
  3009. * @private
  3010. * @constructor
  3011. * @param {Array} [entries] The key-value pairs to cache.
  3012. */
  3013. function ListCache(entries) {
  3014. var index = -1,
  3015. length = entries == null ? 0 : entries.length;
  3016. this.clear();
  3017. while (++index < length) {
  3018. var entry = entries[index];
  3019. this.set(entry[0], entry[1]);
  3020. }
  3021. }
  3022. /**
  3023. * Removes all key-value entries from the list cache.
  3024. *
  3025. * @private
  3026. * @name clear
  3027. * @memberOf ListCache
  3028. */
  3029. function listCacheClear() {
  3030. this.__data__ = [];
  3031. this.size = 0;
  3032. }
  3033. /**
  3034. * Removes `key` and its value from the list cache.
  3035. *
  3036. * @private
  3037. * @name delete
  3038. * @memberOf ListCache
  3039. * @param {string} key The key of the value to remove.
  3040. * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  3041. */
  3042. function listCacheDelete(key) {
  3043. var data = this.__data__,
  3044. index = assocIndexOf(data, key);
  3045. if (index < 0) {
  3046. return false;
  3047. }
  3048. var lastIndex = data.length - 1;
  3049. if (index == lastIndex) {
  3050. data.pop();
  3051. } else {
  3052. splice.call(data, index, 1);
  3053. }
  3054. --this.size;
  3055. return true;
  3056. }
  3057. /**
  3058. * Gets the list cache value for `key`.
  3059. *
  3060. * @private
  3061. * @name get
  3062. * @memberOf ListCache
  3063. * @param {string} key The key of the value to get.
  3064. * @returns {*} Returns the entry value.
  3065. */
  3066. function listCacheGet(key) {
  3067. var data = this.__data__,
  3068. index = assocIndexOf(data, key);
  3069. return index < 0 ? undefined : data[index][1];
  3070. }
  3071. /**
  3072. * Checks if a list cache value for `key` exists.
  3073. *
  3074. * @private
  3075. * @name has
  3076. * @memberOf ListCache
  3077. * @param {string} key The key of the entry to check.
  3078. * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  3079. */
  3080. function listCacheHas(key) {
  3081. return assocIndexOf(this.__data__, key) > -1;
  3082. }
  3083. /**
  3084. * Sets the list cache `key` to `value`.
  3085. *
  3086. * @private
  3087. * @name set
  3088. * @memberOf ListCache
  3089. * @param {string} key The key of the value to set.
  3090. * @param {*} value The value to set.
  3091. * @returns {Object} Returns the list cache instance.
  3092. */
  3093. function listCacheSet(key, value) {
  3094. var data = this.__data__,
  3095. index = assocIndexOf(data, key);
  3096. if (index < 0) {
  3097. ++this.size;
  3098. data.push([key, value]);
  3099. } else {
  3100. data[index][1] = value;
  3101. }
  3102. return this;
  3103. }
  3104. // Add methods to `ListCache`.
  3105. ListCache.prototype.clear = listCacheClear;
  3106. ListCache.prototype['delete'] = listCacheDelete;
  3107. ListCache.prototype.get = listCacheGet;
  3108. ListCache.prototype.has = listCacheHas;
  3109. ListCache.prototype.set = listCacheSet;
  3110. /*------------------------------------------------------------------------*/
  3111. /**
  3112. * Creates a map cache object to store key-value pairs.
  3113. *
  3114. * @private
  3115. * @constructor
  3116. * @param {Array} [entries] The key-value pairs to cache.
  3117. */
  3118. function MapCache(entries) {
  3119. var index = -1,
  3120. length = entries == null ? 0 : entries.length;
  3121. this.clear();
  3122. while (++index < length) {
  3123. var entry = entries[index];
  3124. this.set(entry[0], entry[1]);
  3125. }
  3126. }
  3127. /**
  3128. * Removes all key-value entries from the map.
  3129. *
  3130. * @private
  3131. * @name clear
  3132. * @memberOf MapCache
  3133. */
  3134. function mapCacheClear() {
  3135. this.size = 0;
  3136. this.__data__ = {
  3137. 'hash': new Hash,
  3138. 'map': new (Map || ListCache),
  3139. 'string': new Hash
  3140. };
  3141. }
  3142. /**
  3143. * Removes `key` and its value from the map.
  3144. *
  3145. * @private
  3146. * @name delete
  3147. * @memberOf MapCache
  3148. * @param {string} key The key of the value to remove.
  3149. * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  3150. */
  3151. function mapCacheDelete(key) {
  3152. var result = getMapData(this, key)['delete'](key);
  3153. this.size -= result ? 1 : 0;
  3154. return result;
  3155. }
  3156. /**
  3157. * Gets the map value for `key`.
  3158. *
  3159. * @private
  3160. * @name get
  3161. * @memberOf MapCache
  3162. * @param {string} key The key of the value to get.
  3163. * @returns {*} Returns the entry value.
  3164. */
  3165. function mapCacheGet(key) {
  3166. return getMapData(this, key).get(key);
  3167. }
  3168. /**
  3169. * Checks if a map value for `key` exists.
  3170. *
  3171. * @private
  3172. * @name has
  3173. * @memberOf MapCache
  3174. * @param {string} key The key of the entry to check.
  3175. * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  3176. */
  3177. function mapCacheHas(key) {
  3178. return getMapData(this, key).has(key);
  3179. }
  3180. /**
  3181. * Sets the map `key` to `value`.
  3182. *
  3183. * @private
  3184. * @name set
  3185. * @memberOf MapCache
  3186. * @param {string} key The key of the value to set.
  3187. * @param {*} value The value to set.
  3188. * @returns {Object} Returns the map cache instance.
  3189. */
  3190. function mapCacheSet(key, value) {
  3191. var data = getMapData(this, key),
  3192. size = data.size;
  3193. data.set(key, value);
  3194. this.size += data.size == size ? 0 : 1;
  3195. return this;
  3196. }
  3197. // Add methods to `MapCache`.
  3198. MapCache.prototype.clear = mapCacheClear;
  3199. MapCache.prototype['delete'] = mapCacheDelete;
  3200. MapCache.prototype.get = mapCacheGet;
  3201. MapCache.prototype.has = mapCacheHas;
  3202. MapCache.prototype.set = mapCacheSet;
  3203. /*------------------------------------------------------------------------*/
  3204. /**
  3205. *
  3206. * Creates an array cache object to store unique values.
  3207. *
  3208. * @private
  3209. * @constructor
  3210. * @param {Array} [values] The values to cache.
  3211. */
  3212. function SetCache(values) {
  3213. var index = -1,
  3214. length = values == null ? 0 : values.length;
  3215. this.__data__ = new MapCache;
  3216. while (++index < length) {
  3217. this.add(values[index]);
  3218. }
  3219. }
  3220. /**
  3221. * Adds `value` to the array cache.
  3222. *
  3223. * @private
  3224. * @name add
  3225. * @memberOf SetCache
  3226. * @alias push
  3227. * @param {*} value The value to cache.
  3228. * @returns {Object} Returns the cache instance.
  3229. */
  3230. function setCacheAdd(value) {
  3231. this.__data__.set(value, HASH_UNDEFINED);
  3232. return this;
  3233. }
  3234. /**
  3235. * Checks if `value` is in the array cache.
  3236. *
  3237. * @private
  3238. * @name has
  3239. * @memberOf SetCache
  3240. * @param {*} value The value to search for.
  3241. * @returns {number} Returns `true` if `value` is found, else `false`.
  3242. */
  3243. function setCacheHas(value) {
  3244. return this.__data__.has(value);
  3245. }
  3246. // Add methods to `SetCache`.
  3247. SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
  3248. SetCache.prototype.has = setCacheHas;
  3249. /*------------------------------------------------------------------------*/
  3250. /**
  3251. * Creates a stack cache object to store key-value pairs.
  3252. *
  3253. * @private
  3254. * @constructor
  3255. * @param {Array} [entries] The key-value pairs to cache.
  3256. */
  3257. function Stack(entries) {
  3258. var data = this.__data__ = new ListCache(entries);
  3259. this.size = data.size;
  3260. }
  3261. /**
  3262. * Removes all key-value entries from the stack.
  3263. *
  3264. * @private
  3265. * @name clear
  3266. * @memberOf Stack
  3267. */
  3268. function stackClear() {
  3269. this.__data__ = new ListCache;
  3270. this.size = 0;
  3271. }
  3272. /**
  3273. * Removes `key` and its value from the stack.
  3274. *
  3275. * @private
  3276. * @name delete
  3277. * @memberOf Stack
  3278. * @param {string} key The key of the value to remove.
  3279. * @returns {boolean} Returns `true` if the entry was removed, else `false`.
  3280. */
  3281. function stackDelete(key) {
  3282. var data = this.__data__,
  3283. result = data['delete'](key);
  3284. this.size = data.size;
  3285. return result;
  3286. }
  3287. /**
  3288. * Gets the stack value for `key`.
  3289. *
  3290. * @private
  3291. * @name get
  3292. * @memberOf Stack
  3293. * @param {string} key The key of the value to get.
  3294. * @returns {*} Returns the entry value.
  3295. */
  3296. function stackGet(key) {
  3297. return this.__data__.get(key);
  3298. }
  3299. /**
  3300. * Checks if a stack value for `key` exists.
  3301. *
  3302. * @private
  3303. * @name has
  3304. * @memberOf Stack
  3305. * @param {string} key The key of the entry to check.
  3306. * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
  3307. */
  3308. function stackHas(key) {
  3309. return this.__data__.has(key);
  3310. }
  3311. /**
  3312. * Sets the stack `key` to `value`.
  3313. *
  3314. * @private
  3315. * @name set
  3316. * @memberOf Stack
  3317. * @param {string} key The key of the value to set.
  3318. * @param {*} value The value to set.
  3319. * @returns {Object} Returns the stack cache instance.
  3320. */
  3321. function stackSet(key, value) {
  3322. var data = this.__data__;
  3323. if (data instanceof ListCache) {
  3324. var pairs = data.__data__;
  3325. if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
  3326. pairs.push([key, value]);
  3327. this.size = ++data.size;
  3328. return this;
  3329. }
  3330. data = this.__data__ = new MapCache(pairs);
  3331. }
  3332. data.set(key, value);
  3333. this.size = data.size;
  3334. return this;
  3335. }
  3336. // Add methods to `Stack`.
  3337. Stack.prototype.clear = stackClear;
  3338. Stack.prototype['delete'] = stackDelete;
  3339. Stack.prototype.get = stackGet;
  3340. Stack.prototype.has = stackHas;
  3341. Stack.prototype.set = stackSet;
  3342. /*------------------------------------------------------------------------*/
  3343. /**
  3344. * Creates an array of the enumerable property names of the array-like `value`.
  3345. *
  3346. * @private
  3347. * @param {*} value The value to query.
  3348. * @param {boolean} inherited Specify returning inherited property names.
  3349. * @returns {Array} Returns the array of property names.
  3350. */
  3351. function arrayLikeKeys(value, inherited) {
  3352. var isArr = isArray(value),
  3353. isArg = !isArr && isArguments(value),
  3354. isBuff = !isArr && !isArg && isBuffer(value),
  3355. isType = !isArr && !isArg && !isBuff && isTypedArray(value),
  3356. skipIndexes = isArr || isArg || isBuff || isType,
  3357. result = skipIndexes ? baseTimes(value.length, String) : [],
  3358. length = result.length;
  3359. for (var key in value) {
  3360. if ((inherited || hasOwnProperty.call(value, key)) &&
  3361. !(skipIndexes && (
  3362. // Safari 9 has enumerable `arguments.length` in strict mode.
  3363. key == 'length' ||
  3364. // Node.js 0.10 has enumerable non-index properties on buffers.
  3365. (isBuff && (key == 'offset' || key == 'parent')) ||
  3366. // PhantomJS 2 has enumerable non-index properties on typed arrays.
  3367. (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
  3368. // Skip index properties.
  3369. isIndex(key, length)
  3370. ))) {
  3371. result.push(key);
  3372. }
  3373. }
  3374. return result;
  3375. }
  3376. /**
  3377. * A specialized version of `_.sample` for arrays.
  3378. *
  3379. * @private
  3380. * @param {Array} array The array to sample.
  3381. * @returns {*} Returns the random element.
  3382. */
  3383. function arraySample(array) {
  3384. var length = array.length;
  3385. return length ? array[baseRandom(0, length - 1)] : undefined;
  3386. }
  3387. /**
  3388. * A specialized version of `_.sampleSize` for arrays.
  3389. *
  3390. * @private
  3391. * @param {Array} array The array to sample.
  3392. * @param {number} n The number of elements to sample.
  3393. * @returns {Array} Returns the random elements.
  3394. */
  3395. function arraySampleSize(array, n) {
  3396. return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
  3397. }
  3398. /**
  3399. * A specialized version of `_.shuffle` for arrays.
  3400. *
  3401. * @private
  3402. * @param {Array} array The array to shuffle.
  3403. * @returns {Array} Returns the new shuffled array.
  3404. */
  3405. function arrayShuffle(array) {
  3406. return shuffleSelf(copyArray(array));
  3407. }
  3408. /**
  3409. * This function is like `assignValue` except that it doesn't assign
  3410. * `undefined` values.
  3411. *
  3412. * @private
  3413. * @param {Object} object The object to modify.
  3414. * @param {string} key The key of the property to assign.
  3415. * @param {*} value The value to assign.
  3416. */
  3417. function assignMergeValue(object, key, value) {
  3418. if ((value !== undefined && !eq(object[key], value)) ||
  3419. (value === undefined && !(key in object))) {
  3420. baseAssignValue(object, key, value);
  3421. }
  3422. }
  3423. /**
  3424. * Assigns `value` to `key` of `object` if the existing value is not equivalent
  3425. * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  3426. * for equality comparisons.
  3427. *
  3428. * @private
  3429. * @param {Object} object The object to modify.
  3430. * @param {string} key The key of the property to assign.
  3431. * @param {*} value The value to assign.
  3432. */
  3433. function assignValue(object, key, value) {
  3434. var objValue = object[key];
  3435. if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
  3436. (value === undefined && !(key in object))) {
  3437. baseAssignValue(object, key, value);
  3438. }
  3439. }
  3440. /**
  3441. * Gets the index at which the `key` is found in `array` of key-value pairs.
  3442. *
  3443. * @private
  3444. * @param {Array} array The array to inspect.
  3445. * @param {*} key The key to search for.
  3446. * @returns {number} Returns the index of the matched value, else `-1`.
  3447. */
  3448. function assocIndexOf(array, key) {
  3449. var length = array.length;
  3450. while (length--) {
  3451. if (eq(array[length][0], key)) {
  3452. return length;
  3453. }
  3454. }
  3455. return -1;
  3456. }
  3457. /**
  3458. * Aggregates elements of `collection` on `accumulator` with keys transformed
  3459. * by `iteratee` and values set by `setter`.
  3460. *
  3461. * @private
  3462. * @param {Array|Object} collection The collection to iterate over.
  3463. * @param {Function} setter The function to set `accumulator` values.
  3464. * @param {Function} iteratee The iteratee to transform keys.
  3465. * @param {Object} accumulator The initial aggregated object.
  3466. * @returns {Function} Returns `accumulator`.
  3467. */
  3468. function baseAggregator(collection, setter, iteratee, accumulator) {
  3469. baseEach(collection, function(value, key, collection) {
  3470. setter(accumulator, value, iteratee(value), collection);
  3471. });
  3472. return accumulator;
  3473. }
  3474. /**
  3475. * The base implementation of `_.assign` without support for multiple sources
  3476. * or `customizer` functions.
  3477. *
  3478. * @private
  3479. * @param {Object} object The destination object.
  3480. * @param {Object} source The source object.
  3481. * @returns {Object} Returns `object`.
  3482. */
  3483. function baseAssign(object, source) {
  3484. return object && copyObject(source, keys(source), object);
  3485. }
  3486. /**
  3487. * The base implementation of `_.assignIn` without support for multiple sources
  3488. * or `customizer` functions.
  3489. *
  3490. * @private
  3491. * @param {Object} object The destination object.
  3492. * @param {Object} source The source object.
  3493. * @returns {Object} Returns `object`.
  3494. */
  3495. function baseAssignIn(object, source) {
  3496. return object && copyObject(source, keysIn(source), object);
  3497. }
  3498. /**
  3499. * The base implementation of `assignValue` and `assignMergeValue` without
  3500. * value checks.
  3501. *
  3502. * @private
  3503. * @param {Object} object The object to modify.
  3504. * @param {string} key The key of the property to assign.
  3505. * @param {*} value The value to assign.
  3506. */
  3507. function baseAssignValue(object, key, value) {
  3508. if (key == '__proto__' && defineProperty) {
  3509. defineProperty(object, key, {
  3510. 'configurable': true,
  3511. 'enumerable': true,
  3512. 'value': value,
  3513. 'writable': true
  3514. });
  3515. } else {
  3516. object[key] = value;
  3517. }
  3518. }
  3519. /**
  3520. * The base implementation of `_.at` without support for individual paths.
  3521. *
  3522. * @private
  3523. * @param {Object} object The object to iterate over.
  3524. * @param {string[]} paths The property paths to pick.
  3525. * @returns {Array} Returns the picked elements.
  3526. */
  3527. function baseAt(object, paths) {
  3528. var index = -1,
  3529. length = paths.length,
  3530. result = Array(length),
  3531. skip = object == null;
  3532. while (++index < length) {
  3533. result[index] = skip ? undefined : get(object, paths[index]);
  3534. }
  3535. return result;
  3536. }
  3537. /**
  3538. * The base implementation of `_.clamp` which doesn't coerce arguments.
  3539. *
  3540. * @private
  3541. * @param {number} number The number to clamp.
  3542. * @param {number} [lower] The lower bound.
  3543. * @param {number} upper The upper bound.
  3544. * @returns {number} Returns the clamped number.
  3545. */
  3546. function baseClamp(number, lower, upper) {
  3547. if (number === number) {
  3548. if (upper !== undefined) {
  3549. number = number <= upper ? number : upper;
  3550. }
  3551. if (lower !== undefined) {
  3552. number = number >= lower ? number : lower;
  3553. }
  3554. }
  3555. return number;
  3556. }
  3557. /**
  3558. * The base implementation of `_.clone` and `_.cloneDeep` which tracks
  3559. * traversed objects.
  3560. *
  3561. * @private
  3562. * @param {*} value The value to clone.
  3563. * @param {boolean} bitmask The bitmask flags.
  3564. * 1 - Deep clone
  3565. * 2 - Flatten inherited properties
  3566. * 4 - Clone symbols
  3567. * @param {Function} [customizer] The function to customize cloning.
  3568. * @param {string} [key] The key of `value`.
  3569. * @param {Object} [object] The parent object of `value`.
  3570. * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
  3571. * @returns {*} Returns the cloned value.
  3572. */
  3573. function baseClone(value, bitmask, customizer, key, object, stack) {
  3574. var result,
  3575. isDeep = bitmask & CLONE_DEEP_FLAG,
  3576. isFlat = bitmask & CLONE_FLAT_FLAG,
  3577. isFull = bitmask & CLONE_SYMBOLS_FLAG;
  3578. if (customizer) {
  3579. result = object ? customizer(value, key, object, stack) : customizer(value);
  3580. }
  3581. if (result !== undefined) {
  3582. return result;
  3583. }
  3584. if (!isObject(value)) {
  3585. return value;
  3586. }
  3587. var isArr = isArray(value);
  3588. if (isArr) {
  3589. result = initCloneArray(value);
  3590. if (!isDeep) {
  3591. return copyArray(value, result);
  3592. }
  3593. } else {
  3594. var tag = getTag(value),
  3595. isFunc = tag == funcTag || tag == genTag;
  3596. if (isBuffer(value)) {
  3597. return cloneBuffer(value, isDeep);
  3598. }
  3599. if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
  3600. result = (isFlat || isFunc) ? {} : initCloneObject(value);
  3601. if (!isDeep) {
  3602. return isFlat
  3603. ? copySymbolsIn(value, baseAssignIn(result, value))
  3604. : copySymbols(value, baseAssign(result, value));
  3605. }
  3606. } else {
  3607. if (!cloneableTags[tag]) {
  3608. return object ? value : {};
  3609. }
  3610. result = initCloneByTag(value, tag, isDeep);
  3611. }
  3612. }
  3613. // Check for circular references and return its corresponding clone.
  3614. stack || (stack = new Stack);
  3615. var stacked = stack.get(value);
  3616. if (stacked) {
  3617. return stacked;
  3618. }
  3619. stack.set(value, result);
  3620. if (isSet(value)) {
  3621. value.forEach(function(subValue) {
  3622. result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));
  3623. });
  3624. } else if (isMap(value)) {
  3625. value.forEach(function(subValue, key) {
  3626. result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));
  3627. });
  3628. }
  3629. var keysFunc = isFull
  3630. ? (isFlat ? getAllKeysIn : getAllKeys)
  3631. : (isFlat ? keysIn : keys);
  3632. var props = isArr ? undefined : keysFunc(value);
  3633. arrayEach(props || value, function(subValue, key) {
  3634. if (props) {
  3635. key = subValue;
  3636. subValue = value[key];
  3637. }
  3638. // Recursively populate clone (susceptible to call stack limits).
  3639. assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
  3640. });
  3641. return result;
  3642. }
  3643. /**
  3644. * The base implementation of `_.conforms` which doesn't clone `source`.
  3645. *
  3646. * @private
  3647. * @param {Object} source The object of property predicates to conform to.
  3648. * @returns {Function} Returns the new spec function.
  3649. */
  3650. function baseConforms(source) {
  3651. var props = keys(source);
  3652. return function(object) {
  3653. return baseConformsTo(object, source, props);
  3654. };
  3655. }
  3656. /**
  3657. * The base implementation of `_.conformsTo` which accepts `props` to check.
  3658. *
  3659. * @private
  3660. * @param {Object} object The object to inspect.
  3661. * @param {Object} source The object of property predicates to conform to.
  3662. * @returns {boolean} Returns `true` if `object` conforms, else `false`.
  3663. */
  3664. function baseConformsTo(object, source, props) {
  3665. var length = props.length;
  3666. if (object == null) {
  3667. return !length;
  3668. }
  3669. object = Object(object);
  3670. while (length--) {
  3671. var key = props[length],
  3672. predicate = source[key],
  3673. value = object[key];
  3674. if ((value === undefined && !(key in object)) || !predicate(value)) {
  3675. return false;
  3676. }
  3677. }
  3678. return true;
  3679. }
  3680. /**
  3681. * The base implementation of `_.delay` and `_.defer` which accepts `args`
  3682. * to provide to `func`.
  3683. *
  3684. * @private
  3685. * @param {Function} func The function to delay.
  3686. * @param {number} wait The number of milliseconds to delay invocation.
  3687. * @param {Array} args The arguments to provide to `func`.
  3688. * @returns {number|Object} Returns the timer id or timeout object.
  3689. */
  3690. function baseDelay(func, wait, args) {
  3691. if (typeof func != 'function') {
  3692. throw new TypeError(FUNC_ERROR_TEXT);
  3693. }
  3694. return setTimeout(function() { func.apply(undefined, args); }, wait);
  3695. }
  3696. /**
  3697. * The base implementation of methods like `_.difference` without support
  3698. * for excluding multiple arrays or iteratee shorthands.
  3699. *
  3700. * @private
  3701. * @param {Array} array The array to inspect.
  3702. * @param {Array} values The values to exclude.
  3703. * @param {Function} [iteratee] The iteratee invoked per element.
  3704. * @param {Function} [comparator] The comparator invoked per element.
  3705. * @returns {Array} Returns the new array of filtered values.
  3706. */
  3707. function baseDifference(array, values, iteratee, comparator) {
  3708. var index = -1,
  3709. includes = arrayIncludes,
  3710. isCommon = true,
  3711. length = array.length,
  3712. result = [],
  3713. valuesLength = values.length;
  3714. if (!length) {
  3715. return result;
  3716. }
  3717. if (iteratee) {
  3718. values = arrayMap(values, baseUnary(iteratee));
  3719. }
  3720. if (comparator) {
  3721. includes = arrayIncludesWith;
  3722. isCommon = false;
  3723. }
  3724. else if (values.length >= LARGE_ARRAY_SIZE) {
  3725. includes = cacheHas;
  3726. isCommon = false;
  3727. values = new SetCache(values);
  3728. }
  3729. outer:
  3730. while (++index < length) {
  3731. var value = array[index],
  3732. computed = iteratee == null ? value : iteratee(value);
  3733. value = (comparator || value !== 0) ? value : 0;
  3734. if (isCommon && computed === computed) {
  3735. var valuesIndex = valuesLength;
  3736. while (valuesIndex--) {
  3737. if (values[valuesIndex] === computed) {
  3738. continue outer;
  3739. }
  3740. }
  3741. result.push(value);
  3742. }
  3743. else if (!includes(values, computed, comparator)) {
  3744. result.push(value);
  3745. }
  3746. }
  3747. return result;
  3748. }
  3749. /**
  3750. * The base implementation of `_.forEach` without support for iteratee shorthands.
  3751. *
  3752. * @private
  3753. * @param {Array|Object} collection The collection to iterate over.
  3754. * @param {Function} iteratee The function invoked per iteration.
  3755. * @returns {Array|Object} Returns `collection`.
  3756. */
  3757. var baseEach = createBaseEach(baseForOwn);
  3758. /**
  3759. * The base implementation of `_.forEachRight` without support for iteratee shorthands.
  3760. *
  3761. * @private
  3762. * @param {Array|Object} collection The collection to iterate over.
  3763. * @param {Function} iteratee The function invoked per iteration.
  3764. * @returns {Array|Object} Returns `collection`.
  3765. */
  3766. var baseEachRight = createBaseEach(baseForOwnRight, true);
  3767. /**
  3768. * The base implementation of `_.every` without support for iteratee shorthands.
  3769. *
  3770. * @private
  3771. * @param {Array|Object} collection The collection to iterate over.
  3772. * @param {Function} predicate The function invoked per iteration.
  3773. * @returns {boolean} Returns `true` if all elements pass the predicate check,
  3774. * else `false`
  3775. */
  3776. function baseEvery(collection, predicate) {
  3777. var result = true;
  3778. baseEach(collection, function(value, index, collection) {
  3779. result = !!predicate(value, index, collection);
  3780. return result;
  3781. });
  3782. return result;
  3783. }
  3784. /**
  3785. * The base implementation of methods like `_.max` and `_.min` which accepts a
  3786. * `comparator` to determine the extremum value.
  3787. *
  3788. * @private
  3789. * @param {Array} array The array to iterate over.
  3790. * @param {Function} iteratee The iteratee invoked per iteration.
  3791. * @param {Function} comparator The comparator used to compare values.
  3792. * @returns {*} Returns the extremum value.
  3793. */
  3794. function baseExtremum(array, iteratee, comparator) {
  3795. var index = -1,
  3796. length = array.length;
  3797. while (++index < length) {
  3798. var value = array[index],
  3799. current = iteratee(value);
  3800. if (current != null && (computed === undefined
  3801. ? (current === current && !isSymbol(current))
  3802. : comparator(current, computed)
  3803. )) {
  3804. var computed = current,
  3805. result = value;
  3806. }
  3807. }
  3808. return result;
  3809. }
  3810. /**
  3811. * The base implementation of `_.fill` without an iteratee call guard.
  3812. *
  3813. * @private
  3814. * @param {Array} array The array to fill.
  3815. * @param {*} value The value to fill `array` with.
  3816. * @param {number} [start=0] The start position.
  3817. * @param {number} [end=array.length] The end position.
  3818. * @returns {Array} Returns `array`.
  3819. */
  3820. function baseFill(array, value, start, end) {
  3821. var length = array.length;
  3822. start = toInteger(start);
  3823. if (start < 0) {
  3824. start = -start > length ? 0 : (length + start);
  3825. }
  3826. end = (end === undefined || end > length) ? length : toInteger(end);
  3827. if (end < 0) {
  3828. end += length;
  3829. }
  3830. end = start > end ? 0 : toLength(end);
  3831. while (start < end) {
  3832. array[start++] = value;
  3833. }
  3834. return array;
  3835. }
  3836. /**
  3837. * The base implementation of `_.filter` without support for iteratee shorthands.
  3838. *
  3839. * @private
  3840. * @param {Array|Object} collection The collection to iterate over.
  3841. * @param {Function} predicate The function invoked per iteration.
  3842. * @returns {Array} Returns the new filtered array.
  3843. */
  3844. function baseFilter(collection, predicate) {
  3845. var result = [];
  3846. baseEach(collection, function(value, index, collection) {
  3847. if (predicate(value, index, collection)) {
  3848. result.push(value);
  3849. }
  3850. });
  3851. return result;
  3852. }
  3853. /**
  3854. * The base implementation of `_.flatten` with support for restricting flattening.
  3855. *
  3856. * @private
  3857. * @param {Array} array The array to flatten.
  3858. * @param {number} depth The maximum recursion depth.
  3859. * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
  3860. * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
  3861. * @param {Array} [result=[]] The initial result value.
  3862. * @returns {Array} Returns the new flattened array.
  3863. */
  3864. function baseFlatten(array, depth, predicate, isStrict, result) {
  3865. var index = -1,
  3866. length = array.length;
  3867. predicate || (predicate = isFlattenable);
  3868. result || (result = []);
  3869. while (++index < length) {
  3870. var value = array[index];
  3871. if (depth > 0 && predicate(value)) {
  3872. if (depth > 1) {
  3873. // Recursively flatten arrays (susceptible to call stack limits).
  3874. baseFlatten(value, depth - 1, predicate, isStrict, result);
  3875. } else {
  3876. arrayPush(result, value);
  3877. }
  3878. } else if (!isStrict) {
  3879. result[result.length] = value;
  3880. }
  3881. }
  3882. return result;
  3883. }
  3884. /**
  3885. * The base implementation of `baseForOwn` which iterates over `object`
  3886. * properties returned by `keysFunc` and invokes `iteratee` for each property.
  3887. * Iteratee functions may exit iteration early by explicitly returning `false`.
  3888. *
  3889. * @private
  3890. * @param {Object} object The object to iterate over.
  3891. * @param {Function} iteratee The function invoked per iteration.
  3892. * @param {Function} keysFunc The function to get the keys of `object`.
  3893. * @returns {Object} Returns `object`.
  3894. */
  3895. var baseFor = createBaseFor();
  3896. /**
  3897. * This function is like `baseFor` except that it iterates over properties
  3898. * in the opposite order.
  3899. *
  3900. * @private
  3901. * @param {Object} object The object to iterate over.
  3902. * @param {Function} iteratee The function invoked per iteration.
  3903. * @param {Function} keysFunc The function to get the keys of `object`.
  3904. * @returns {Object} Returns `object`.
  3905. */
  3906. var baseForRight = createBaseFor(true);
  3907. /**
  3908. * The base implementation of `_.forOwn` without support for iteratee shorthands.
  3909. *
  3910. * @private
  3911. * @param {Object} object The object to iterate over.
  3912. * @param {Function} iteratee The function invoked per iteration.
  3913. * @returns {Object} Returns `object`.
  3914. */
  3915. function baseForOwn(object, iteratee) {
  3916. return object && baseFor(object, iteratee, keys);
  3917. }
  3918. /**
  3919. * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
  3920. *
  3921. * @private
  3922. * @param {Object} object The object to iterate over.
  3923. * @param {Function} iteratee The function invoked per iteration.
  3924. * @returns {Object} Returns `object`.
  3925. */
  3926. function baseForOwnRight(object, iteratee) {
  3927. return object && baseForRight(object, iteratee, keys);
  3928. }
  3929. /**
  3930. * The base implementation of `_.functions` which creates an array of
  3931. * `object` function property names filtered from `props`.
  3932. *
  3933. * @private
  3934. * @param {Object} object The object to inspect.
  3935. * @param {Array} props The property names to filter.
  3936. * @returns {Array} Returns the function names.
  3937. */
  3938. function baseFunctions(object, props) {
  3939. return arrayFilter(props, function(key) {
  3940. return isFunction(object[key]);
  3941. });
  3942. }
  3943. /**
  3944. * The base implementation of `_.get` without support for default values.
  3945. *
  3946. * @private
  3947. * @param {Object} object The object to query.
  3948. * @param {Array|string} path The path of the property to get.
  3949. * @returns {*} Returns the resolved value.
  3950. */
  3951. function baseGet(object, path) {
  3952. path = castPath(path, object);
  3953. var index = 0,
  3954. length = path.length;
  3955. while (object != null && index < length) {
  3956. object = object[toKey(path[index++])];
  3957. }
  3958. return (index && index == length) ? object : undefined;
  3959. }
  3960. /**
  3961. * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
  3962. * `keysFunc` and `symbolsFunc` to get the enumerable property names and
  3963. * symbols of `object`.
  3964. *
  3965. * @private
  3966. * @param {Object} object The object to query.
  3967. * @param {Function} keysFunc The function to get the keys of `object`.
  3968. * @param {Function} symbolsFunc The function to get the symbols of `object`.
  3969. * @returns {Array} Returns the array of property names and symbols.
  3970. */
  3971. function baseGetAllKeys(object, keysFunc, symbolsFunc) {
  3972. var result = keysFunc(object);
  3973. return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
  3974. }
  3975. /**
  3976. * The base implementation of `getTag` without fallbacks for buggy environments.
  3977. *
  3978. * @private
  3979. * @param {*} value The value to query.
  3980. * @returns {string} Returns the `toStringTag`.
  3981. */
  3982. function baseGetTag(value) {
  3983. if (value == null) {
  3984. return value === undefined ? undefinedTag : nullTag;
  3985. }
  3986. return (symToStringTag && symToStringTag in Object(value))
  3987. ? getRawTag(value)
  3988. : objectToString(value);
  3989. }
  3990. /**
  3991. * The base implementation of `_.gt` which doesn't coerce arguments.
  3992. *
  3993. * @private
  3994. * @param {*} value The value to compare.
  3995. * @param {*} other The other value to compare.
  3996. * @returns {boolean} Returns `true` if `value` is greater than `other`,
  3997. * else `false`.
  3998. */
  3999. function baseGt(value, other) {
  4000. return value > other;
  4001. }
  4002. /**
  4003. * The base implementation of `_.has` without support for deep paths.
  4004. *
  4005. * @private
  4006. * @param {Object} [object] The object to query.
  4007. * @param {Array|string} key The key to check.
  4008. * @returns {boolean} Returns `true` if `key` exists, else `false`.
  4009. */
  4010. function baseHas(object, key) {
  4011. return object != null && hasOwnProperty.call(object, key);
  4012. }
  4013. /**
  4014. * The base implementation of `_.hasIn` without support for deep paths.
  4015. *
  4016. * @private
  4017. * @param {Object} [object] The object to query.
  4018. * @param {Array|string} key The key to check.
  4019. * @returns {boolean} Returns `true` if `key` exists, else `false`.
  4020. */
  4021. function baseHasIn(object, key) {
  4022. return object != null && key in Object(object);
  4023. }
  4024. /**
  4025. * The base implementation of `_.inRange` which doesn't coerce arguments.
  4026. *
  4027. * @private
  4028. * @param {number} number The number to check.
  4029. * @param {number} start The start of the range.
  4030. * @param {number} end The end of the range.
  4031. * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
  4032. */
  4033. function baseInRange(number, start, end) {
  4034. return number >= nativeMin(start, end) && number < nativeMax(start, end);
  4035. }
  4036. /**
  4037. * The base implementation of methods like `_.intersection`, without support
  4038. * for iteratee shorthands, that accepts an array of arrays to inspect.
  4039. *
  4040. * @private
  4041. * @param {Array} arrays The arrays to inspect.
  4042. * @param {Function} [iteratee] The iteratee invoked per element.
  4043. * @param {Function} [comparator] The comparator invoked per element.
  4044. * @returns {Array} Returns the new array of shared values.
  4045. */
  4046. function baseIntersection(arrays, iteratee, comparator) {
  4047. var includes = comparator ? arrayIncludesWith : arrayIncludes,
  4048. length = arrays[0].length,
  4049. othLength = arrays.length,
  4050. othIndex = othLength,
  4051. caches = Array(othLength),
  4052. maxLength = Infinity,
  4053. result = [];
  4054. while (othIndex--) {
  4055. var array = arrays[othIndex];
  4056. if (othIndex && iteratee) {
  4057. array = arrayMap(array, baseUnary(iteratee));
  4058. }
  4059. maxLength = nativeMin(array.length, maxLength);
  4060. caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
  4061. ? new SetCache(othIndex && array)
  4062. : undefined;
  4063. }
  4064. array = arrays[0];
  4065. var index = -1,
  4066. seen = caches[0];
  4067. outer:
  4068. while (++index < length && result.length < maxLength) {
  4069. var value = array[index],
  4070. computed = iteratee ? iteratee(value) : value;
  4071. value = (comparator || value !== 0) ? value : 0;
  4072. if (!(seen
  4073. ? cacheHas(seen, computed)
  4074. : includes(result, computed, comparator)
  4075. )) {
  4076. othIndex = othLength;
  4077. while (--othIndex) {
  4078. var cache = caches[othIndex];
  4079. if (!(cache
  4080. ? cacheHas(cache, computed)
  4081. : includes(arrays[othIndex], computed, comparator))
  4082. ) {
  4083. continue outer;
  4084. }
  4085. }
  4086. if (seen) {
  4087. seen.push(computed);
  4088. }
  4089. result.push(value);
  4090. }
  4091. }
  4092. return result;
  4093. }
  4094. /**
  4095. * The base implementation of `_.invert` and `_.invertBy` which inverts
  4096. * `object` with values transformed by `iteratee` and set by `setter`.
  4097. *
  4098. * @private
  4099. * @param {Object} object The object to iterate over.
  4100. * @param {Function} setter The function to set `accumulator` values.
  4101. * @param {Function} iteratee The iteratee to transform values.
  4102. * @param {Object} accumulator The initial inverted object.
  4103. * @returns {Function} Returns `accumulator`.
  4104. */
  4105. function baseInverter(object, setter, iteratee, accumulator) {
  4106. baseForOwn(object, function(value, key, object) {
  4107. setter(accumulator, iteratee(value), key, object);
  4108. });
  4109. return accumulator;
  4110. }
  4111. /**
  4112. * The base implementation of `_.invoke` without support for individual
  4113. * method arguments.
  4114. *
  4115. * @private
  4116. * @param {Object} object The object to query.
  4117. * @param {Array|string} path The path of the method to invoke.
  4118. * @param {Array} args The arguments to invoke the method with.
  4119. * @returns {*} Returns the result of the invoked method.
  4120. */
  4121. function baseInvoke(object, path, args) {
  4122. path = castPath(path, object);
  4123. object = parent(object, path);
  4124. var func = object == null ? object : object[toKey(last(path))];
  4125. return func == null ? undefined : apply(func, object, args);
  4126. }
  4127. /**
  4128. * The base implementation of `_.isArguments`.
  4129. *
  4130. * @private
  4131. * @param {*} value The value to check.
  4132. * @returns {boolean} Returns `true` if `value` is an `arguments` object,
  4133. */
  4134. function baseIsArguments(value) {
  4135. return isObjectLike(value) && baseGetTag(value) == argsTag;
  4136. }
  4137. /**
  4138. * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
  4139. *
  4140. * @private
  4141. * @param {*} value The value to check.
  4142. * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
  4143. */
  4144. function baseIsArrayBuffer(value) {
  4145. return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
  4146. }
  4147. /**
  4148. * The base implementation of `_.isDate` without Node.js optimizations.
  4149. *
  4150. * @private
  4151. * @param {*} value The value to check.
  4152. * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
  4153. */
  4154. function baseIsDate(value) {
  4155. return isObjectLike(value) && baseGetTag(value) == dateTag;
  4156. }
  4157. /**
  4158. * The base implementation of `_.isEqual` which supports partial comparisons
  4159. * and tracks traversed objects.
  4160. *
  4161. * @private
  4162. * @param {*} value The value to compare.
  4163. * @param {*} other The other value to compare.
  4164. * @param {boolean} bitmask The bitmask flags.
  4165. * 1 - Unordered comparison
  4166. * 2 - Partial comparison
  4167. * @param {Function} [customizer] The function to customize comparisons.
  4168. * @param {Object} [stack] Tracks traversed `value` and `other` objects.
  4169. * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
  4170. */
  4171. function baseIsEqual(value, other, bitmask, customizer, stack) {
  4172. if (value === other) {
  4173. return true;
  4174. }
  4175. if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
  4176. return value !== value && other !== other;
  4177. }
  4178. return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
  4179. }
  4180. /**
  4181. * A specialized version of `baseIsEqual` for arrays and objects which performs
  4182. * deep comparisons and tracks traversed objects enabling objects with circular
  4183. * references to be compared.
  4184. *
  4185. * @private
  4186. * @param {Object} object The object to compare.
  4187. * @param {Object} other The other object to compare.
  4188. * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
  4189. * @param {Function} customizer The function to customize comparisons.
  4190. * @param {Function} equalFunc The function to determine equivalents of values.
  4191. * @param {Object} [stack] Tracks traversed `object` and `other` objects.
  4192. * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
  4193. */
  4194. function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
  4195. var objIsArr = isArray(object),
  4196. othIsArr = isArray(other),
  4197. objTag = objIsArr ? arrayTag : getTag(object),
  4198. othTag = othIsArr ? arrayTag : getTag(other);
  4199. objTag = objTag == argsTag ? objectTag : objTag;
  4200. othTag = othTag == argsTag ? objectTag : othTag;
  4201. var objIsObj = objTag == objectTag,
  4202. othIsObj = othTag == objectTag,
  4203. isSameTag = objTag == othTag;
  4204. if (isSameTag && isBuffer(object)) {
  4205. if (!isBuffer(other)) {
  4206. return false;
  4207. }
  4208. objIsArr = true;
  4209. objIsObj = false;
  4210. }
  4211. if (isSameTag && !objIsObj) {
  4212. stack || (stack = new Stack);
  4213. return (objIsArr || isTypedArray(object))
  4214. ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
  4215. : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
  4216. }
  4217. if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
  4218. var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
  4219. othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
  4220. if (objIsWrapped || othIsWrapped) {
  4221. var objUnwrapped = objIsWrapped ? object.value() : object,
  4222. othUnwrapped = othIsWrapped ? other.value() : other;
  4223. stack || (stack = new Stack);
  4224. return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
  4225. }
  4226. }
  4227. if (!isSameTag) {
  4228. return false;
  4229. }
  4230. stack || (stack = new Stack);
  4231. return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
  4232. }
  4233. /**
  4234. * The base implementation of `_.isMap` without Node.js optimizations.
  4235. *
  4236. * @private
  4237. * @param {*} value The value to check.
  4238. * @returns {boolean} Returns `true` if `value` is a map, else `false`.
  4239. */
  4240. function baseIsMap(value) {
  4241. return isObjectLike(value) && getTag(value) == mapTag;
  4242. }
  4243. /**
  4244. * The base implementation of `_.isMatch` without support for iteratee shorthands.
  4245. *
  4246. * @private
  4247. * @param {Object} object The object to inspect.
  4248. * @param {Object} source The object of property values to match.
  4249. * @param {Array} matchData The property names, values, and compare flags to match.
  4250. * @param {Function} [customizer] The function to customize comparisons.
  4251. * @returns {boolean} Returns `true` if `object` is a match, else `false`.
  4252. */
  4253. function baseIsMatch(object, source, matchData, customizer) {
  4254. var index = matchData.length,
  4255. length = index,
  4256. noCustomizer = !customizer;
  4257. if (object == null) {
  4258. return !length;
  4259. }
  4260. object = Object(object);
  4261. while (index--) {
  4262. var data = matchData[index];
  4263. if ((noCustomizer && data[2])
  4264. ? data[1] !== object[data[0]]
  4265. : !(data[0] in object)
  4266. ) {
  4267. return false;
  4268. }
  4269. }
  4270. while (++index < length) {
  4271. data = matchData[index];
  4272. var key = data[0],
  4273. objValue = object[key],
  4274. srcValue = data[1];
  4275. if (noCustomizer && data[2]) {
  4276. if (objValue === undefined && !(key in object)) {
  4277. return false;
  4278. }
  4279. } else {
  4280. var stack = new Stack;
  4281. if (customizer) {
  4282. var result = customizer(objValue, srcValue, key, object, source, stack);
  4283. }
  4284. if (!(result === undefined
  4285. ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
  4286. : result
  4287. )) {
  4288. return false;
  4289. }
  4290. }
  4291. }
  4292. return true;
  4293. }
  4294. /**
  4295. * The base implementation of `_.isNative` without bad shim checks.
  4296. *
  4297. * @private
  4298. * @param {*} value The value to check.
  4299. * @returns {boolean} Returns `true` if `value` is a native function,
  4300. * else `false`.
  4301. */
  4302. function baseIsNative(value) {
  4303. if (!isObject(value) || isMasked(value)) {
  4304. return false;
  4305. }
  4306. var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
  4307. return pattern.test(toSource(value));
  4308. }
  4309. /**
  4310. * The base implementation of `_.isRegExp` without Node.js optimizations.
  4311. *
  4312. * @private
  4313. * @param {*} value The value to check.
  4314. * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
  4315. */
  4316. function baseIsRegExp(value) {
  4317. return isObjectLike(value) && baseGetTag(value) == regexpTag;
  4318. }
  4319. /**
  4320. * The base implementation of `_.isSet` without Node.js optimizations.
  4321. *
  4322. * @private
  4323. * @param {*} value The value to check.
  4324. * @returns {boolean} Returns `true` if `value` is a set, else `false`.
  4325. */
  4326. function baseIsSet(value) {
  4327. return isObjectLike(value) && getTag(value) == setTag;
  4328. }
  4329. /**
  4330. * The base implementation of `_.isTypedArray` without Node.js optimizations.
  4331. *
  4332. * @private
  4333. * @param {*} value The value to check.
  4334. * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
  4335. */
  4336. function baseIsTypedArray(value) {
  4337. return isObjectLike(value) &&
  4338. isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
  4339. }
  4340. /**
  4341. * The base implementation of `_.iteratee`.
  4342. *
  4343. * @private
  4344. * @param {*} [value=_.identity] The value to convert to an iteratee.
  4345. * @returns {Function} Returns the iteratee.
  4346. */
  4347. function baseIteratee(value) {
  4348. // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.
  4349. // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
  4350. if (typeof value == 'function') {
  4351. return value;
  4352. }
  4353. if (value == null) {
  4354. return identity;
  4355. }
  4356. if (typeof value == 'object') {
  4357. return isArray(value)
  4358. ? baseMatchesProperty(value[0], value[1])
  4359. : baseMatches(value);
  4360. }
  4361. return property(value);
  4362. }
  4363. /**
  4364. * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
  4365. *
  4366. * @private
  4367. * @param {Object} object The object to query.
  4368. * @returns {Array} Returns the array of property names.
  4369. */
  4370. function baseKeys(object) {
  4371. if (!isPrototype(object)) {
  4372. return nativeKeys(object);
  4373. }
  4374. var result = [];
  4375. for (var key in Object(object)) {
  4376. if (hasOwnProperty.call(object, key) && key != 'constructor') {
  4377. result.push(key);
  4378. }
  4379. }
  4380. return result;
  4381. }
  4382. /**
  4383. * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
  4384. *
  4385. * @private
  4386. * @param {Object} object The object to query.
  4387. * @returns {Array} Returns the array of property names.
  4388. */
  4389. function baseKeysIn(object) {
  4390. if (!isObject(object)) {
  4391. return nativeKeysIn(object);
  4392. }
  4393. var isProto = isPrototype(object),
  4394. result = [];
  4395. for (var key in object) {
  4396. if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
  4397. result.push(key);
  4398. }
  4399. }
  4400. return result;
  4401. }
  4402. /**
  4403. * The base implementation of `_.lt` which doesn't coerce arguments.
  4404. *
  4405. * @private
  4406. * @param {*} value The value to compare.
  4407. * @param {*} other The other value to compare.
  4408. * @returns {boolean} Returns `true` if `value` is less than `other`,
  4409. * else `false`.
  4410. */
  4411. function baseLt(value, other) {
  4412. return value < other;
  4413. }
  4414. /**
  4415. * The base implementation of `_.map` without support for iteratee shorthands.
  4416. *
  4417. * @private
  4418. * @param {Array|Object} collection The collection to iterate over.
  4419. * @param {Function} iteratee The function invoked per iteration.
  4420. * @returns {Array} Returns the new mapped array.
  4421. */
  4422. function baseMap(collection, iteratee) {
  4423. var index = -1,
  4424. result = isArrayLike(collection) ? Array(collection.length) : [];
  4425. baseEach(collection, function(value, key, collection) {
  4426. result[++index] = iteratee(value, key, collection);
  4427. });
  4428. return result;
  4429. }
  4430. /**
  4431. * The base implementation of `_.matches` which doesn't clone `source`.
  4432. *
  4433. * @private
  4434. * @param {Object} source The object of property values to match.
  4435. * @returns {Function} Returns the new spec function.
  4436. */
  4437. function baseMatches(source) {
  4438. var matchData = getMatchData(source);
  4439. if (matchData.length == 1 && matchData[0][2]) {
  4440. return matchesStrictComparable(matchData[0][0], matchData[0][1]);
  4441. }
  4442. return function(object) {
  4443. return object === source || baseIsMatch(object, source, matchData);
  4444. };
  4445. }
  4446. /**
  4447. * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.
  4448. *
  4449. * @private
  4450. * @param {string} path The path of the property to get.
  4451. * @param {*} srcValue The value to match.
  4452. * @returns {Function} Returns the new spec function.
  4453. */
  4454. function baseMatchesProperty(path, srcValue) {
  4455. if (isKey(path) && isStrictComparable(srcValue)) {
  4456. return matchesStrictComparable(toKey(path), srcValue);
  4457. }
  4458. return function(object) {
  4459. var objValue = get(object, path);
  4460. return (objValue === undefined && objValue === srcValue)
  4461. ? hasIn(object, path)
  4462. : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
  4463. };
  4464. }
  4465. /**
  4466. * The base implementation of `_.merge` without support for multiple sources.
  4467. *
  4468. * @private
  4469. * @param {Object} object The destination object.
  4470. * @param {Object} source The source object.
  4471. * @param {number} srcIndex The index of `source`.
  4472. * @param {Function} [customizer] The function to customize merged values.
  4473. * @param {Object} [stack] Tracks traversed source values and their merged
  4474. * counterparts.
  4475. */
  4476. function baseMerge(object, source, srcIndex, customizer, stack) {
  4477. if (object === source) {
  4478. return;
  4479. }
  4480. baseFor(source, function(srcValue, key) {
  4481. stack || (stack = new Stack);
  4482. if (isObject(srcValue)) {
  4483. baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
  4484. }
  4485. else {
  4486. var newValue = customizer
  4487. ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)
  4488. : undefined;
  4489. if (newValue === undefined) {
  4490. newValue = srcValue;
  4491. }
  4492. assignMergeValue(object, key, newValue);
  4493. }
  4494. }, keysIn);
  4495. }
  4496. /**
  4497. * A specialized version of `baseMerge` for arrays and objects which performs
  4498. * deep merges and tracks traversed objects enabling objects with circular
  4499. * references to be merged.
  4500. *
  4501. * @private
  4502. * @param {Object} object The destination object.
  4503. * @param {Object} source The source object.
  4504. * @param {string} key The key of the value to merge.
  4505. * @param {number} srcIndex The index of `source`.
  4506. * @param {Function} mergeFunc The function to merge values.
  4507. * @param {Function} [customizer] The function to customize assigned values.
  4508. * @param {Object} [stack] Tracks traversed source values and their merged
  4509. * counterparts.
  4510. */
  4511. function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
  4512. var objValue = safeGet(object, key),
  4513. srcValue = safeGet(source, key),
  4514. stacked = stack.get(srcValue);
  4515. if (stacked) {
  4516. assignMergeValue(object, key, stacked);
  4517. return;
  4518. }
  4519. var newValue = customizer
  4520. ? customizer(objValue, srcValue, (key + ''), object, source, stack)
  4521. : undefined;
  4522. var isCommon = newValue === undefined;
  4523. if (isCommon) {
  4524. var isArr = isArray(srcValue),
  4525. isBuff = !isArr && isBuffer(srcValue),
  4526. isTyped = !isArr && !isBuff && isTypedArray(srcValue);
  4527. newValue = srcValue;
  4528. if (isArr || isBuff || isTyped) {
  4529. if (isArray(objValue)) {
  4530. newValue = objValue;
  4531. }
  4532. else if (isArrayLikeObject(objValue)) {
  4533. newValue = copyArray(objValue);
  4534. }
  4535. else if (isBuff) {
  4536. isCommon = false;
  4537. newValue = cloneBuffer(srcValue, true);
  4538. }
  4539. else if (isTyped) {
  4540. isCommon = false;
  4541. newValue = cloneTypedArray(srcValue, true);
  4542. }
  4543. else {
  4544. newValue = [];
  4545. }
  4546. }
  4547. else if (isPlainObject(srcValue) || isArguments(srcValue)) {
  4548. newValue = objValue;
  4549. if (isArguments(objValue)) {
  4550. newValue = toPlainObject(objValue);
  4551. }
  4552. else if (!isObject(objValue) || isFunction(objValue)) {
  4553. newValue = initCloneObject(srcValue);
  4554. }
  4555. }
  4556. else {
  4557. isCommon = false;
  4558. }
  4559. }
  4560. if (isCommon) {
  4561. // Recursively merge objects and arrays (susceptible to call stack limits).
  4562. stack.set(srcValue, newValue);
  4563. mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
  4564. stack['delete'](srcValue);
  4565. }
  4566. assignMergeValue(object, key, newValue);
  4567. }
  4568. /**
  4569. * The base implementation of `_.nth` which doesn't coerce arguments.
  4570. *
  4571. * @private
  4572. * @param {Array} array The array to query.
  4573. * @param {number} n The index of the element to return.
  4574. * @returns {*} Returns the nth element of `array`.
  4575. */
  4576. function baseNth(array, n) {
  4577. var length = array.length;
  4578. if (!length) {
  4579. return;
  4580. }
  4581. n += n < 0 ? length : 0;
  4582. return isIndex(n, length) ? array[n] : undefined;
  4583. }
  4584. /**
  4585. * The base implementation of `_.orderBy` without param guards.
  4586. *
  4587. * @private
  4588. * @param {Array|Object} collection The collection to iterate over.
  4589. * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
  4590. * @param {string[]} orders The sort orders of `iteratees`.
  4591. * @returns {Array} Returns the new sorted array.
  4592. */
  4593. function baseOrderBy(collection, iteratees, orders) {
  4594. if (iteratees.length) {
  4595. iteratees = arrayMap(iteratees, function(iteratee) {
  4596. if (isArray(iteratee)) {
  4597. return function(value) {
  4598. return baseGet(value, iteratee.length === 1 ? iteratee[0] : iteratee);
  4599. }
  4600. }
  4601. return iteratee;
  4602. });
  4603. } else {
  4604. iteratees = [identity];
  4605. }
  4606. var index = -1;
  4607. iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
  4608. var result = baseMap(collection, function(value, key, collection) {
  4609. var criteria = arrayMap(iteratees, function(iteratee) {
  4610. return iteratee(value);
  4611. });
  4612. return { 'criteria': criteria, 'index': ++index, 'value': value };
  4613. });
  4614. return baseSortBy(result, function(object, other) {
  4615. return compareMultiple(object, other, orders);
  4616. });
  4617. }
  4618. /**
  4619. * The base implementation of `_.pick` without support for individual
  4620. * property identifiers.
  4621. *
  4622. * @private
  4623. * @param {Object} object The source object.
  4624. * @param {string[]} paths The property paths to pick.
  4625. * @returns {Object} Returns the new object.
  4626. */
  4627. function basePick(object, paths) {
  4628. return basePickBy(object, paths, function(value, path) {
  4629. return hasIn(object, path);
  4630. });
  4631. }
  4632. /**
  4633. * The base implementation of `_.pickBy` without support for iteratee shorthands.
  4634. *
  4635. * @private
  4636. * @param {Object} object The source object.
  4637. * @param {string[]} paths The property paths to pick.
  4638. * @param {Function} predicate The function invoked per property.
  4639. * @returns {Object} Returns the new object.
  4640. */
  4641. function basePickBy(object, paths, predicate) {
  4642. var index = -1,
  4643. length = paths.length,
  4644. result = {};
  4645. while (++index < length) {
  4646. var path = paths[index],
  4647. value = baseGet(object, path);
  4648. if (predicate(value, path)) {
  4649. baseSet(result, castPath(path, object), value);
  4650. }
  4651. }
  4652. return result;
  4653. }
  4654. /**
  4655. * A specialized version of `baseProperty` which supports deep paths.
  4656. *
  4657. * @private
  4658. * @param {Array|string} path The path of the property to get.
  4659. * @returns {Function} Returns the new accessor function.
  4660. */
  4661. function basePropertyDeep(path) {
  4662. return function(object) {
  4663. return baseGet(object, path);
  4664. };
  4665. }
  4666. /**
  4667. * The base implementation of `_.pullAllBy` without support for iteratee
  4668. * shorthands.
  4669. *
  4670. * @private
  4671. * @param {Array} array The array to modify.
  4672. * @param {Array} values The values to remove.
  4673. * @param {Function} [iteratee] The iteratee invoked per element.
  4674. * @param {Function} [comparator] The comparator invoked per element.
  4675. * @returns {Array} Returns `array`.
  4676. */
  4677. function basePullAll(array, values, iteratee, comparator) {
  4678. var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
  4679. index = -1,
  4680. length = values.length,
  4681. seen = array;
  4682. if (array === values) {
  4683. values = copyArray(values);
  4684. }
  4685. if (iteratee) {
  4686. seen = arrayMap(array, baseUnary(iteratee));
  4687. }
  4688. while (++index < length) {
  4689. var fromIndex = 0,
  4690. value = values[index],
  4691. computed = iteratee ? iteratee(value) : value;
  4692. while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
  4693. if (seen !== array) {
  4694. splice.call(seen, fromIndex, 1);
  4695. }
  4696. splice.call(array, fromIndex, 1);
  4697. }
  4698. }
  4699. return array;
  4700. }
  4701. /**
  4702. * The base implementation of `_.pullAt` without support for individual
  4703. * indexes or capturing the removed elements.
  4704. *
  4705. * @private
  4706. * @param {Array} array The array to modify.
  4707. * @param {number[]} indexes The indexes of elements to remove.
  4708. * @returns {Array} Returns `array`.
  4709. */
  4710. function basePullAt(array, indexes) {
  4711. var length = array ? indexes.length : 0,
  4712. lastIndex = length - 1;
  4713. while (length--) {
  4714. var index = indexes[length];
  4715. if (length == lastIndex || index !== previous) {
  4716. var previous = index;
  4717. if (isIndex(index)) {
  4718. splice.call(array, index, 1);
  4719. } else {
  4720. baseUnset(array, index);
  4721. }
  4722. }
  4723. }
  4724. return array;
  4725. }
  4726. /**
  4727. * The base implementation of `_.random` without support for returning
  4728. * floating-point numbers.
  4729. *
  4730. * @private
  4731. * @param {number} lower The lower bound.
  4732. * @param {number} upper The upper bound.
  4733. * @returns {number} Returns the random number.
  4734. */
  4735. function baseRandom(lower, upper) {
  4736. return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
  4737. }
  4738. /**
  4739. * The base implementation of `_.range` and `_.rangeRight` which doesn't
  4740. * coerce arguments.
  4741. *
  4742. * @private
  4743. * @param {number} start The start of the range.
  4744. * @param {number} end The end of the range.
  4745. * @param {number} step The value to increment or decrement by.
  4746. * @param {boolean} [fromRight] Specify iterating from right to left.
  4747. * @returns {Array} Returns the range of numbers.
  4748. */
  4749. function baseRange(start, end, step, fromRight) {
  4750. var index = -1,
  4751. length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
  4752. result = Array(length);
  4753. while (length--) {
  4754. result[fromRight ? length : ++index] = start;
  4755. start += step;
  4756. }
  4757. return result;
  4758. }
  4759. /**
  4760. * The base implementation of `_.repeat` which doesn't coerce arguments.
  4761. *
  4762. * @private
  4763. * @param {string} string The string to repeat.
  4764. * @param {number} n The number of times to repeat the string.
  4765. * @returns {string} Returns the repeated string.
  4766. */
  4767. function baseRepeat(string, n) {
  4768. var result = '';
  4769. if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
  4770. return result;
  4771. }
  4772. // Leverage the exponentiation by squaring algorithm for a faster repeat.
  4773. // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
  4774. do {
  4775. if (n % 2) {
  4776. result += string;
  4777. }
  4778. n = nativeFloor(n / 2);
  4779. if (n) {
  4780. string += string;
  4781. }
  4782. } while (n);
  4783. return result;
  4784. }
  4785. /**
  4786. * The base implementation of `_.rest` which doesn't validate or coerce arguments.
  4787. *
  4788. * @private
  4789. * @param {Function} func The function to apply a rest parameter to.
  4790. * @param {number} [start=func.length-1] The start position of the rest parameter.
  4791. * @returns {Function} Returns the new function.
  4792. */
  4793. function baseRest(func, start) {
  4794. return setToString(overRest(func, start, identity), func + '');
  4795. }
  4796. /**
  4797. * The base implementation of `_.sample`.
  4798. *
  4799. * @private
  4800. * @param {Array|Object} collection The collection to sample.
  4801. * @returns {*} Returns the random element.
  4802. */
  4803. function baseSample(collection) {
  4804. return arraySample(values(collection));
  4805. }
  4806. /**
  4807. * The base implementation of `_.sampleSize` without param guards.
  4808. *
  4809. * @private
  4810. * @param {Array|Object} collection The collection to sample.
  4811. * @param {number} n The number of elements to sample.
  4812. * @returns {Array} Returns the random elements.
  4813. */
  4814. function baseSampleSize(collection, n) {
  4815. var array = values(collection);
  4816. return shuffleSelf(array, baseClamp(n, 0, array.length));
  4817. }
  4818. /**
  4819. * The base implementation of `_.set`.
  4820. *
  4821. * @private
  4822. * @param {Object} object The object to modify.
  4823. * @param {Array|string} path The path of the property to set.
  4824. * @param {*} value The value to set.
  4825. * @param {Function} [customizer] The function to customize path creation.
  4826. * @returns {Object} Returns `object`.
  4827. */
  4828. function baseSet(object, path, value, customizer) {
  4829. if (!isObject(object)) {
  4830. return object;
  4831. }
  4832. path = castPath(path, object);
  4833. var index = -1,
  4834. length = path.length,
  4835. lastIndex = length - 1,
  4836. nested = object;
  4837. while (nested != null && ++index < length) {
  4838. var key = toKey(path[index]),
  4839. newValue = value;
  4840. if (key === '__proto__' || key === 'constructor' || key === 'prototype') {
  4841. return object;
  4842. }
  4843. if (index != lastIndex) {
  4844. var objValue = nested[key];
  4845. newValue = customizer ? customizer(objValue, key, nested) : undefined;
  4846. if (newValue === undefined) {
  4847. newValue = isObject(objValue)
  4848. ? objValue
  4849. : (isIndex(path[index + 1]) ? [] : {});
  4850. }
  4851. }
  4852. assignValue(nested, key, newValue);
  4853. nested = nested[key];
  4854. }
  4855. return object;
  4856. }
  4857. /**
  4858. * The base implementation of `setData` without support for hot loop shorting.
  4859. *
  4860. * @private
  4861. * @param {Function} func The function to associate metadata with.
  4862. * @param {*} data The metadata.
  4863. * @returns {Function} Returns `func`.
  4864. */
  4865. var baseSetData = !metaMap ? identity : function(func, data) {
  4866. metaMap.set(func, data);
  4867. return func;
  4868. };
  4869. /**
  4870. * The base implementation of `setToString` without support for hot loop shorting.
  4871. *
  4872. * @private
  4873. * @param {Function} func The function to modify.
  4874. * @param {Function} string The `toString` result.
  4875. * @returns {Function} Returns `func`.
  4876. */
  4877. var baseSetToString = !defineProperty ? identity : function(func, string) {
  4878. return defineProperty(func, 'toString', {
  4879. 'configurable': true,
  4880. 'enumerable': false,
  4881. 'value': constant(string),
  4882. 'writable': true
  4883. });
  4884. };
  4885. /**
  4886. * The base implementation of `_.shuffle`.
  4887. *
  4888. * @private
  4889. * @param {Array|Object} collection The collection to shuffle.
  4890. * @returns {Array} Returns the new shuffled array.
  4891. */
  4892. function baseShuffle(collection) {
  4893. return shuffleSelf(values(collection));
  4894. }
  4895. /**
  4896. * The base implementation of `_.slice` without an iteratee call guard.
  4897. *
  4898. * @private
  4899. * @param {Array} array The array to slice.
  4900. * @param {number} [start=0] The start position.
  4901. * @param {number} [end=array.length] The end position.
  4902. * @returns {Array} Returns the slice of `array`.
  4903. */
  4904. function baseSlice(array, start, end) {
  4905. var index = -1,
  4906. length = array.length;
  4907. if (start < 0) {
  4908. start = -start > length ? 0 : (length + start);
  4909. }
  4910. end = end > length ? length : end;
  4911. if (end < 0) {
  4912. end += length;
  4913. }
  4914. length = start > end ? 0 : ((end - start) >>> 0);
  4915. start >>>= 0;
  4916. var result = Array(length);
  4917. while (++index < length) {
  4918. result[index] = array[index + start];
  4919. }
  4920. return result;
  4921. }
  4922. /**
  4923. * The base implementation of `_.some` without support for iteratee shorthands.
  4924. *
  4925. * @private
  4926. * @param {Array|Object} collection The collection to iterate over.
  4927. * @param {Function} predicate The function invoked per iteration.
  4928. * @returns {boolean} Returns `true` if any element passes the predicate check,
  4929. * else `false`.
  4930. */
  4931. function baseSome(collection, predicate) {
  4932. var result;
  4933. baseEach(collection, function(value, index, collection) {
  4934. result = predicate(value, index, collection);
  4935. return !result;
  4936. });
  4937. return !!result;
  4938. }
  4939. /**
  4940. * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which
  4941. * performs a binary search of `array` to determine the index at which `value`
  4942. * should be inserted into `array` in order to maintain its sort order.
  4943. *
  4944. * @private
  4945. * @param {Array} array The sorted array to inspect.
  4946. * @param {*} value The value to evaluate.
  4947. * @param {boolean} [retHighest] Specify returning the highest qualified index.
  4948. * @returns {number} Returns the index at which `value` should be inserted
  4949. * into `array`.
  4950. */
  4951. function baseSortedIndex(array, value, retHighest) {
  4952. var low = 0,
  4953. high = array == null ? low : array.length;
  4954. if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
  4955. while (low < high) {
  4956. var mid = (low + high) >>> 1,
  4957. computed = array[mid];
  4958. if (computed !== null && !isSymbol(computed) &&
  4959. (retHighest ? (computed <= value) : (computed < value))) {
  4960. low = mid + 1;
  4961. } else {
  4962. high = mid;
  4963. }
  4964. }
  4965. return high;
  4966. }
  4967. return baseSortedIndexBy(array, value, identity, retHighest);
  4968. }
  4969. /**
  4970. * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
  4971. * which invokes `iteratee` for `value` and each element of `array` to compute
  4972. * their sort ranking. The iteratee is invoked with one argument; (value).
  4973. *
  4974. * @private
  4975. * @param {Array} array The sorted array to inspect.
  4976. * @param {*} value The value to evaluate.
  4977. * @param {Function} iteratee The iteratee invoked per element.
  4978. * @param {boolean} [retHighest] Specify returning the highest qualified index.
  4979. * @returns {number} Returns the index at which `value` should be inserted
  4980. * into `array`.
  4981. */
  4982. function baseSortedIndexBy(array, value, iteratee, retHighest) {
  4983. var low = 0,
  4984. high = array == null ? 0 : array.length;
  4985. if (high === 0) {
  4986. return 0;
  4987. }
  4988. value = iteratee(value);
  4989. var valIsNaN = value !== value,
  4990. valIsNull = value === null,
  4991. valIsSymbol = isSymbol(value),
  4992. valIsUndefined = value === undefined;
  4993. while (low < high) {
  4994. var mid = nativeFloor((low + high) / 2),
  4995. computed = iteratee(array[mid]),
  4996. othIsDefined = computed !== undefined,
  4997. othIsNull = computed === null,
  4998. othIsReflexive = computed === computed,
  4999. othIsSymbol = isSymbol(computed);
  5000. if (valIsNaN) {
  5001. var setLow = retHighest || othIsReflexive;
  5002. } else if (valIsUndefined) {
  5003. setLow = othIsReflexive && (retHighest || othIsDefined);
  5004. } else if (valIsNull) {
  5005. setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
  5006. } else if (valIsSymbol) {
  5007. setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
  5008. } else if (othIsNull || othIsSymbol) {
  5009. setLow = false;
  5010. } else {
  5011. setLow = retHighest ? (computed <= value) : (computed < value);
  5012. }
  5013. if (setLow) {
  5014. low = mid + 1;
  5015. } else {
  5016. high = mid;
  5017. }
  5018. }
  5019. return nativeMin(high, MAX_ARRAY_INDEX);
  5020. }
  5021. /**
  5022. * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
  5023. * support for iteratee shorthands.
  5024. *
  5025. * @private
  5026. * @param {Array} array The array to inspect.
  5027. * @param {Function} [iteratee] The iteratee invoked per element.
  5028. * @returns {Array} Returns the new duplicate free array.
  5029. */
  5030. function baseSortedUniq(array, iteratee) {
  5031. var index = -1,
  5032. length = array.length,
  5033. resIndex = 0,
  5034. result = [];
  5035. while (++index < length) {
  5036. var value = array[index],
  5037. computed = iteratee ? iteratee(value) : value;
  5038. if (!index || !eq(computed, seen)) {
  5039. var seen = computed;
  5040. result[resIndex++] = value === 0 ? 0 : value;
  5041. }
  5042. }
  5043. return result;
  5044. }
  5045. /**
  5046. * The base implementation of `_.toNumber` which doesn't ensure correct
  5047. * conversions of binary, hexadecimal, or octal string values.
  5048. *
  5049. * @private
  5050. * @param {*} value The value to process.
  5051. * @returns {number} Returns the number.
  5052. */
  5053. function baseToNumber(value) {
  5054. if (typeof value == 'number') {
  5055. return value;
  5056. }
  5057. if (isSymbol(value)) {
  5058. return NAN;
  5059. }
  5060. return +value;
  5061. }
  5062. /**
  5063. * The base implementation of `_.toString` which doesn't convert nullish
  5064. * values to empty strings.
  5065. *
  5066. * @private
  5067. * @param {*} value The value to process.
  5068. * @returns {string} Returns the string.
  5069. */
  5070. function baseToString(value) {
  5071. // Exit early for strings to avoid a performance hit in some environments.
  5072. if (typeof value == 'string') {
  5073. return value;
  5074. }
  5075. if (isArray(value)) {
  5076. // Recursively convert values (susceptible to call stack limits).
  5077. return arrayMap(value, baseToString) + '';
  5078. }
  5079. if (isSymbol(value)) {
  5080. return symbolToString ? symbolToString.call(value) : '';
  5081. }
  5082. var result = (value + '');
  5083. return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
  5084. }
  5085. /**
  5086. * The base implementation of `_.uniqBy` without support for iteratee shorthands.
  5087. *
  5088. * @private
  5089. * @param {Array} array The array to inspect.
  5090. * @param {Function} [iteratee] The iteratee invoked per element.
  5091. * @param {Function} [comparator] The comparator invoked per element.
  5092. * @returns {Array} Returns the new duplicate free array.
  5093. */
  5094. function baseUniq(array, iteratee, comparator) {
  5095. var index = -1,
  5096. includes = arrayIncludes,
  5097. length = array.length,
  5098. isCommon = true,
  5099. result = [],
  5100. seen = result;
  5101. if (comparator) {
  5102. isCommon = false;
  5103. includes = arrayIncludesWith;
  5104. }
  5105. else if (length >= LARGE_ARRAY_SIZE) {
  5106. var set = iteratee ? null : createSet(array);
  5107. if (set) {
  5108. return setToArray(set);
  5109. }
  5110. isCommon = false;
  5111. includes = cacheHas;
  5112. seen = new SetCache;
  5113. }
  5114. else {
  5115. seen = iteratee ? [] : result;
  5116. }
  5117. outer:
  5118. while (++index < length) {
  5119. var value = array[index],
  5120. computed = iteratee ? iteratee(value) : value;
  5121. value = (comparator || value !== 0) ? value : 0;
  5122. if (isCommon && computed === computed) {
  5123. var seenIndex = seen.length;
  5124. while (seenIndex--) {
  5125. if (seen[seenIndex] === computed) {
  5126. continue outer;
  5127. }
  5128. }
  5129. if (iteratee) {
  5130. seen.push(computed);
  5131. }
  5132. result.push(value);
  5133. }
  5134. else if (!includes(seen, computed, comparator)) {
  5135. if (seen !== result) {
  5136. seen.push(computed);
  5137. }
  5138. result.push(value);
  5139. }
  5140. }
  5141. return result;
  5142. }
  5143. /**
  5144. * The base implementation of `_.unset`.
  5145. *
  5146. * @private
  5147. * @param {Object} object The object to modify.
  5148. * @param {Array|string} path The property path to unset.
  5149. * @returns {boolean} Returns `true` if the property is deleted, else `false`.
  5150. */
  5151. function baseUnset(object, path) {
  5152. path = castPath(path, object);
  5153. object = parent(object, path);
  5154. return object == null || delete object[toKey(last(path))];
  5155. }
  5156. /**
  5157. * The base implementation of `_.update`.
  5158. *
  5159. * @private
  5160. * @param {Object} object The object to modify.
  5161. * @param {Array|string} path The path of the property to update.
  5162. * @param {Function} updater The function to produce the updated value.
  5163. * @param {Function} [customizer] The function to customize path creation.
  5164. * @returns {Object} Returns `object`.
  5165. */
  5166. function baseUpdate(object, path, updater, customizer) {
  5167. return baseSet(object, path, updater(baseGet(object, path)), customizer);
  5168. }
  5169. /**
  5170. * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
  5171. * without support for iteratee shorthands.
  5172. *
  5173. * @private
  5174. * @param {Array} array The array to query.
  5175. * @param {Function} predicate The function invoked per iteration.
  5176. * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
  5177. * @param {boolean} [fromRight] Specify iterating from right to left.
  5178. * @returns {Array} Returns the slice of `array`.
  5179. */
  5180. function baseWhile(array, predicate, isDrop, fromRight) {
  5181. var length = array.length,
  5182. index = fromRight ? length : -1;
  5183. while ((fromRight ? index-- : ++index < length) &&
  5184. predicate(array[index], index, array)) {}
  5185. return isDrop
  5186. ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
  5187. : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
  5188. }
  5189. /**
  5190. * The base implementation of `wrapperValue` which returns the result of
  5191. * performing a sequence of actions on the unwrapped `value`, where each
  5192. * successive action is supplied the return value of the previous.
  5193. *
  5194. * @private
  5195. * @param {*} value The unwrapped value.
  5196. * @param {Array} actions Actions to perform to resolve the unwrapped value.
  5197. * @returns {*} Returns the resolved value.
  5198. */
  5199. function baseWrapperValue(value, actions) {
  5200. var result = value;
  5201. if (result instanceof LazyWrapper) {
  5202. result = result.value();
  5203. }
  5204. return arrayReduce(actions, function(result, action) {
  5205. return action.func.apply(action.thisArg, arrayPush([result], action.args));
  5206. }, result);
  5207. }
  5208. /**
  5209. * The base implementation of methods like `_.xor`, without support for
  5210. * iteratee shorthands, that accepts an array of arrays to inspect.
  5211. *
  5212. * @private
  5213. * @param {Array} arrays The arrays to inspect.
  5214. * @param {Function} [iteratee] The iteratee invoked per element.
  5215. * @param {Function} [comparator] The comparator invoked per element.
  5216. * @returns {Array} Returns the new array of values.
  5217. */
  5218. function baseXor(arrays, iteratee, comparator) {
  5219. var length = arrays.length;
  5220. if (length < 2) {
  5221. return length ? baseUniq(arrays[0]) : [];
  5222. }
  5223. var index = -1,
  5224. result = Array(length);
  5225. while (++index < length) {
  5226. var array = arrays[index],
  5227. othIndex = -1;
  5228. while (++othIndex < length) {
  5229. if (othIndex != index) {
  5230. result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
  5231. }
  5232. }
  5233. }
  5234. return baseUniq(baseFlatten(result, 1), iteratee, comparator);
  5235. }
  5236. /**
  5237. * This base implementation of `_.zipObject` which assigns values using `assignFunc`.
  5238. *
  5239. * @private
  5240. * @param {Array} props The property identifiers.
  5241. * @param {Array} values The property values.
  5242. * @param {Function} assignFunc The function to assign values.
  5243. * @returns {Object} Returns the new object.
  5244. */
  5245. function baseZipObject(props, values, assignFunc) {
  5246. var index = -1,
  5247. length = props.length,
  5248. valsLength = values.length,
  5249. result = {};
  5250. while (++index < length) {
  5251. var value = index < valsLength ? values[index] : undefined;
  5252. assignFunc(result, props[index], value);
  5253. }
  5254. return result;
  5255. }
  5256. /**
  5257. * Casts `value` to an empty array if it's not an array like object.
  5258. *
  5259. * @private
  5260. * @param {*} value The value to inspect.
  5261. * @returns {Array|Object} Returns the cast array-like object.
  5262. */
  5263. function castArrayLikeObject(value) {
  5264. return isArrayLikeObject(value) ? value : [];
  5265. }
  5266. /**
  5267. * Casts `value` to `identity` if it's not a function.
  5268. *
  5269. * @private
  5270. * @param {*} value The value to inspect.
  5271. * @returns {Function} Returns cast function.
  5272. */
  5273. function castFunction(value) {
  5274. return typeof value == 'function' ? value : identity;
  5275. }
  5276. /**
  5277. * Casts `value` to a path array if it's not one.
  5278. *
  5279. * @private
  5280. * @param {*} value The value to inspect.
  5281. * @param {Object} [object] The object to query keys on.
  5282. * @returns {Array} Returns the cast property path array.
  5283. */
  5284. function castPath(value, object) {
  5285. if (isArray(value)) {
  5286. return value;
  5287. }
  5288. return isKey(value, object) ? [value] : stringToPath(toString(value));
  5289. }
  5290. /**
  5291. * A `baseRest` alias which can be replaced with `identity` by module
  5292. * replacement plugins.
  5293. *
  5294. * @private
  5295. * @type {Function}
  5296. * @param {Function} func The function to apply a rest parameter to.
  5297. * @returns {Function} Returns the new function.
  5298. */
  5299. var castRest = baseRest;
  5300. /**
  5301. * Casts `array` to a slice if it's needed.
  5302. *
  5303. * @private
  5304. * @param {Array} array The array to inspect.
  5305. * @param {number} start The start position.
  5306. * @param {number} [end=array.length] The end position.
  5307. * @returns {Array} Returns the cast slice.
  5308. */
  5309. function castSlice(array, start, end) {
  5310. var length = array.length;
  5311. end = end === undefined ? length : end;
  5312. return (!start && end >= length) ? array : baseSlice(array, start, end);
  5313. }
  5314. /**
  5315. * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
  5316. *
  5317. * @private
  5318. * @param {number|Object} id The timer id or timeout object of the timer to clear.
  5319. */
  5320. var clearTimeout = ctxClearTimeout || function(id) {
  5321. return root.clearTimeout(id);
  5322. };
  5323. /**
  5324. * Creates a clone of `buffer`.
  5325. *
  5326. * @private
  5327. * @param {Buffer} buffer The buffer to clone.
  5328. * @param {boolean} [isDeep] Specify a deep clone.
  5329. * @returns {Buffer} Returns the cloned buffer.
  5330. */
  5331. function cloneBuffer(buffer, isDeep) {
  5332. if (isDeep) {
  5333. return buffer.slice();
  5334. }
  5335. var length = buffer.length,
  5336. result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);
  5337. buffer.copy(result);
  5338. return result;
  5339. }
  5340. /**
  5341. * Creates a clone of `arrayBuffer`.
  5342. *
  5343. * @private
  5344. * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
  5345. * @returns {ArrayBuffer} Returns the cloned array buffer.
  5346. */
  5347. function cloneArrayBuffer(arrayBuffer) {
  5348. var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
  5349. new Uint8Array(result).set(new Uint8Array(arrayBuffer));
  5350. return result;
  5351. }
  5352. /**
  5353. * Creates a clone of `dataView`.
  5354. *
  5355. * @private
  5356. * @param {Object} dataView The data view to clone.
  5357. * @param {boolean} [isDeep] Specify a deep clone.
  5358. * @returns {Object} Returns the cloned data view.
  5359. */
  5360. function cloneDataView(dataView, isDeep) {
  5361. var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
  5362. return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
  5363. }
  5364. /**
  5365. * Creates a clone of `regexp`.
  5366. *
  5367. * @private
  5368. * @param {Object} regexp The regexp to clone.
  5369. * @returns {Object} Returns the cloned regexp.
  5370. */
  5371. function cloneRegExp(regexp) {
  5372. var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
  5373. result.lastIndex = regexp.lastIndex;
  5374. return result;
  5375. }
  5376. /**
  5377. * Creates a clone of the `symbol` object.
  5378. *
  5379. * @private
  5380. * @param {Object} symbol The symbol object to clone.
  5381. * @returns {Object} Returns the cloned symbol object.
  5382. */
  5383. function cloneSymbol(symbol) {
  5384. return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
  5385. }
  5386. /**
  5387. * Creates a clone of `typedArray`.
  5388. *
  5389. * @private
  5390. * @param {Object} typedArray The typed array to clone.
  5391. * @param {boolean} [isDeep] Specify a deep clone.
  5392. * @returns {Object} Returns the cloned typed array.
  5393. */
  5394. function cloneTypedArray(typedArray, isDeep) {
  5395. var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
  5396. return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
  5397. }
  5398. /**
  5399. * Compares values to sort them in ascending order.
  5400. *
  5401. * @private
  5402. * @param {*} value The value to compare.
  5403. * @param {*} other The other value to compare.
  5404. * @returns {number} Returns the sort order indicator for `value`.
  5405. */
  5406. function compareAscending(value, other) {
  5407. if (value !== other) {
  5408. var valIsDefined = value !== undefined,
  5409. valIsNull = value === null,
  5410. valIsReflexive = value === value,
  5411. valIsSymbol = isSymbol(value);
  5412. var othIsDefined = other !== undefined,
  5413. othIsNull = other === null,
  5414. othIsReflexive = other === other,
  5415. othIsSymbol = isSymbol(other);
  5416. if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||
  5417. (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||
  5418. (valIsNull && othIsDefined && othIsReflexive) ||
  5419. (!valIsDefined && othIsReflexive) ||
  5420. !valIsReflexive) {
  5421. return 1;
  5422. }
  5423. if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||
  5424. (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||
  5425. (othIsNull && valIsDefined && valIsReflexive) ||
  5426. (!othIsDefined && valIsReflexive) ||
  5427. !othIsReflexive) {
  5428. return -1;
  5429. }
  5430. }
  5431. return 0;
  5432. }
  5433. /**
  5434. * Used by `_.orderBy` to compare multiple properties of a value to another
  5435. * and stable sort them.
  5436. *
  5437. * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
  5438. * specify an order of "desc" for descending or "asc" for ascending sort order
  5439. * of corresponding values.
  5440. *
  5441. * @private
  5442. * @param {Object} object The object to compare.
  5443. * @param {Object} other The other object to compare.
  5444. * @param {boolean[]|string[]} orders The order to sort by for each property.
  5445. * @returns {number} Returns the sort order indicator for `object`.
  5446. */
  5447. function compareMultiple(object, other, orders) {
  5448. var index = -1,
  5449. objCriteria = object.criteria,
  5450. othCriteria = other.criteria,
  5451. length = objCriteria.length,
  5452. ordersLength = orders.length;
  5453. while (++index < length) {
  5454. var result = compareAscending(objCriteria[index], othCriteria[index]);
  5455. if (result) {
  5456. if (index >= ordersLength) {
  5457. return result;
  5458. }
  5459. var order = orders[index];
  5460. return result * (order == 'desc' ? -1 : 1);
  5461. }
  5462. }
  5463. // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
  5464. // that causes it, under certain circumstances, to provide the same value for
  5465. // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
  5466. // for more details.
  5467. //
  5468. // This also ensures a stable sort in V8 and other engines.
  5469. // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
  5470. return object.index - other.index;
  5471. }
  5472. /**
  5473. * Creates an array that is the composition of partially applied arguments,
  5474. * placeholders, and provided arguments into a single array of arguments.
  5475. *
  5476. * @private
  5477. * @param {Array} args The provided arguments.
  5478. * @param {Array} partials The arguments to prepend to those provided.
  5479. * @param {Array} holders The `partials` placeholder indexes.
  5480. * @params {boolean} [isCurried] Specify composing for a curried function.
  5481. * @returns {Array} Returns the new array of composed arguments.
  5482. */
  5483. function composeArgs(args, partials, holders, isCurried) {
  5484. var argsIndex = -1,
  5485. argsLength = args.length,
  5486. holdersLength = holders.length,
  5487. leftIndex = -1,
  5488. leftLength = partials.length,
  5489. rangeLength = nativeMax(argsLength - holdersLength, 0),
  5490. result = Array(leftLength + rangeLength),
  5491. isUncurried = !isCurried;
  5492. while (++leftIndex < leftLength) {
  5493. result[leftIndex] = partials[leftIndex];
  5494. }
  5495. while (++argsIndex < holdersLength) {
  5496. if (isUncurried || argsIndex < argsLength) {
  5497. result[holders[argsIndex]] = args[argsIndex];
  5498. }
  5499. }
  5500. while (rangeLength--) {
  5501. result[leftIndex++] = args[argsIndex++];
  5502. }
  5503. return result;
  5504. }
  5505. /**
  5506. * This function is like `composeArgs` except that the arguments composition
  5507. * is tailored for `_.partialRight`.
  5508. *
  5509. * @private
  5510. * @param {Array} args The provided arguments.
  5511. * @param {Array} partials The arguments to append to those provided.
  5512. * @param {Array} holders The `partials` placeholder indexes.
  5513. * @params {boolean} [isCurried] Specify composing for a curried function.
  5514. * @returns {Array} Returns the new array of composed arguments.
  5515. */
  5516. function composeArgsRight(args, partials, holders, isCurried) {
  5517. var argsIndex = -1,
  5518. argsLength = args.length,
  5519. holdersIndex = -1,
  5520. holdersLength = holders.length,
  5521. rightIndex = -1,
  5522. rightLength = partials.length,
  5523. rangeLength = nativeMax(argsLength - holdersLength, 0),
  5524. result = Array(rangeLength + rightLength),
  5525. isUncurried = !isCurried;
  5526. while (++argsIndex < rangeLength) {
  5527. result[argsIndex] = args[argsIndex];
  5528. }
  5529. var offset = argsIndex;
  5530. while (++rightIndex < rightLength) {
  5531. result[offset + rightIndex] = partials[rightIndex];
  5532. }
  5533. while (++holdersIndex < holdersLength) {
  5534. if (isUncurried || argsIndex < argsLength) {
  5535. result[offset + holders[holdersIndex]] = args[argsIndex++];
  5536. }
  5537. }
  5538. return result;
  5539. }
  5540. /**
  5541. * Copies the values of `source` to `array`.
  5542. *
  5543. * @private
  5544. * @param {Array} source The array to copy values from.
  5545. * @param {Array} [array=[]] The array to copy values to.
  5546. * @returns {Array} Returns `array`.
  5547. */
  5548. function copyArray(source, array) {
  5549. var index = -1,
  5550. length = source.length;
  5551. array || (array = Array(length));
  5552. while (++index < length) {
  5553. array[index] = source[index];
  5554. }
  5555. return array;
  5556. }
  5557. /**
  5558. * Copies properties of `source` to `object`.
  5559. *
  5560. * @private
  5561. * @param {Object} source The object to copy properties from.
  5562. * @param {Array} props The property identifiers to copy.
  5563. * @param {Object} [object={}] The object to copy properties to.
  5564. * @param {Function} [customizer] The function to customize copied values.
  5565. * @returns {Object} Returns `object`.
  5566. */
  5567. function copyObject(source, props, object, customizer) {
  5568. var isNew = !object;
  5569. object || (object = {});
  5570. var index = -1,
  5571. length = props.length;
  5572. while (++index < length) {
  5573. var key = props[index];
  5574. var newValue = customizer
  5575. ? customizer(object[key], source[key], key, object, source)
  5576. : undefined;
  5577. if (newValue === undefined) {
  5578. newValue = source[key];
  5579. }
  5580. if (isNew) {
  5581. baseAssignValue(object, key, newValue);
  5582. } else {
  5583. assignValue(object, key, newValue);
  5584. }
  5585. }
  5586. return object;
  5587. }
  5588. /**
  5589. * Copies own symbols of `source` to `object`.
  5590. *
  5591. * @private
  5592. * @param {Object} source The object to copy symbols from.
  5593. * @param {Object} [object={}] The object to copy symbols to.
  5594. * @returns {Object} Returns `object`.
  5595. */
  5596. function copySymbols(source, object) {
  5597. return copyObject(source, getSymbols(source), object);
  5598. }
  5599. /**
  5600. * Copies own and inherited symbols of `source` to `object`.
  5601. *
  5602. * @private
  5603. * @param {Object} source The object to copy symbols from.
  5604. * @param {Object} [object={}] The object to copy symbols to.
  5605. * @returns {Object} Returns `object`.
  5606. */
  5607. function copySymbolsIn(source, object) {
  5608. return copyObject(source, getSymbolsIn(source), object);
  5609. }
  5610. /**
  5611. * Creates a function like `_.groupBy`.
  5612. *
  5613. * @private
  5614. * @param {Function} setter The function to set accumulator values.
  5615. * @param {Function} [initializer] The accumulator object initializer.
  5616. * @returns {Function} Returns the new aggregator function.
  5617. */
  5618. function createAggregator(setter, initializer) {
  5619. return function(collection, iteratee) {
  5620. var func = isArray(collection) ? arrayAggregator : baseAggregator,
  5621. accumulator = initializer ? initializer() : {};
  5622. return func(collection, setter, getIteratee(iteratee, 2), accumulator);
  5623. };
  5624. }
  5625. /**
  5626. * Creates a function like `_.assign`.
  5627. *
  5628. * @private
  5629. * @param {Function} assigner The function to assign values.
  5630. * @returns {Function} Returns the new assigner function.
  5631. */
  5632. function createAssigner(assigner) {
  5633. return baseRest(function(object, sources) {
  5634. var index = -1,
  5635. length = sources.length,
  5636. customizer = length > 1 ? sources[length - 1] : undefined,
  5637. guard = length > 2 ? sources[2] : undefined;
  5638. customizer = (assigner.length > 3 && typeof customizer == 'function')
  5639. ? (length--, customizer)
  5640. : undefined;
  5641. if (guard && isIterateeCall(sources[0], sources[1], guard)) {
  5642. customizer = length < 3 ? undefined : customizer;
  5643. length = 1;
  5644. }
  5645. object = Object(object);
  5646. while (++index < length) {
  5647. var source = sources[index];
  5648. if (source) {
  5649. assigner(object, source, index, customizer);
  5650. }
  5651. }
  5652. return object;
  5653. });
  5654. }
  5655. /**
  5656. * Creates a `baseEach` or `baseEachRight` function.
  5657. *
  5658. * @private
  5659. * @param {Function} eachFunc The function to iterate over a collection.
  5660. * @param {boolean} [fromRight] Specify iterating from right to left.
  5661. * @returns {Function} Returns the new base function.
  5662. */
  5663. function createBaseEach(eachFunc, fromRight) {
  5664. return function(collection, iteratee) {
  5665. if (collection == null) {
  5666. return collection;
  5667. }
  5668. if (!isArrayLike(collection)) {
  5669. return eachFunc(collection, iteratee);
  5670. }
  5671. var length = collection.length,
  5672. index = fromRight ? length : -1,
  5673. iterable = Object(collection);
  5674. while ((fromRight ? index-- : ++index < length)) {
  5675. if (iteratee(iterable[index], index, iterable) === false) {
  5676. break;
  5677. }
  5678. }
  5679. return collection;
  5680. };
  5681. }
  5682. /**
  5683. * Creates a base function for methods like `_.forIn` and `_.forOwn`.
  5684. *
  5685. * @private
  5686. * @param {boolean} [fromRight] Specify iterating from right to left.
  5687. * @returns {Function} Returns the new base function.
  5688. */
  5689. function createBaseFor(fromRight) {
  5690. return function(object, iteratee, keysFunc) {
  5691. var index = -1,
  5692. iterable = Object(object),
  5693. props = keysFunc(object),
  5694. length = props.length;
  5695. while (length--) {
  5696. var key = props[fromRight ? length : ++index];
  5697. if (iteratee(iterable[key], key, iterable) === false) {
  5698. break;
  5699. }
  5700. }
  5701. return object;
  5702. };
  5703. }
  5704. /**
  5705. * Creates a function that wraps `func` to invoke it with the optional `this`
  5706. * binding of `thisArg`.
  5707. *
  5708. * @private
  5709. * @param {Function} func The function to wrap.
  5710. * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  5711. * @param {*} [thisArg] The `this` binding of `func`.
  5712. * @returns {Function} Returns the new wrapped function.
  5713. */
  5714. function createBind(func, bitmask, thisArg) {
  5715. var isBind = bitmask & WRAP_BIND_FLAG,
  5716. Ctor = createCtor(func);
  5717. function wrapper() {
  5718. var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
  5719. return fn.apply(isBind ? thisArg : this, arguments);
  5720. }
  5721. return wrapper;
  5722. }
  5723. /**
  5724. * Creates a function like `_.lowerFirst`.
  5725. *
  5726. * @private
  5727. * @param {string} methodName The name of the `String` case method to use.
  5728. * @returns {Function} Returns the new case function.
  5729. */
  5730. function createCaseFirst(methodName) {
  5731. return function(string) {
  5732. string = toString(string);
  5733. var strSymbols = hasUnicode(string)
  5734. ? stringToArray(string)
  5735. : undefined;
  5736. var chr = strSymbols
  5737. ? strSymbols[0]
  5738. : string.charAt(0);
  5739. var trailing = strSymbols
  5740. ? castSlice(strSymbols, 1).join('')
  5741. : string.slice(1);
  5742. return chr[methodName]() + trailing;
  5743. };
  5744. }
  5745. /**
  5746. * Creates a function like `_.camelCase`.
  5747. *
  5748. * @private
  5749. * @param {Function} callback The function to combine each word.
  5750. * @returns {Function} Returns the new compounder function.
  5751. */
  5752. function createCompounder(callback) {
  5753. return function(string) {
  5754. return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
  5755. };
  5756. }
  5757. /**
  5758. * Creates a function that produces an instance of `Ctor` regardless of
  5759. * whether it was invoked as part of a `new` expression or by `call` or `apply`.
  5760. *
  5761. * @private
  5762. * @param {Function} Ctor The constructor to wrap.
  5763. * @returns {Function} Returns the new wrapped function.
  5764. */
  5765. function createCtor(Ctor) {
  5766. return function() {
  5767. // Use a `switch` statement to work with class constructors. See
  5768. // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
  5769. // for more details.
  5770. var args = arguments;
  5771. switch (args.length) {
  5772. case 0: return new Ctor;
  5773. case 1: return new Ctor(args[0]);
  5774. case 2: return new Ctor(args[0], args[1]);
  5775. case 3: return new Ctor(args[0], args[1], args[2]);
  5776. case 4: return new Ctor(args[0], args[1], args[2], args[3]);
  5777. case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
  5778. case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
  5779. case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
  5780. }
  5781. var thisBinding = baseCreate(Ctor.prototype),
  5782. result = Ctor.apply(thisBinding, args);
  5783. // Mimic the constructor's `return` behavior.
  5784. // See https://es5.github.io/#x13.2.2 for more details.
  5785. return isObject(result) ? result : thisBinding;
  5786. };
  5787. }
  5788. /**
  5789. * Creates a function that wraps `func` to enable currying.
  5790. *
  5791. * @private
  5792. * @param {Function} func The function to wrap.
  5793. * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  5794. * @param {number} arity The arity of `func`.
  5795. * @returns {Function} Returns the new wrapped function.
  5796. */
  5797. function createCurry(func, bitmask, arity) {
  5798. var Ctor = createCtor(func);
  5799. function wrapper() {
  5800. var length = arguments.length,
  5801. args = Array(length),
  5802. index = length,
  5803. placeholder = getHolder(wrapper);
  5804. while (index--) {
  5805. args[index] = arguments[index];
  5806. }
  5807. var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)
  5808. ? []
  5809. : replaceHolders(args, placeholder);
  5810. length -= holders.length;
  5811. if (length < arity) {
  5812. return createRecurry(
  5813. func, bitmask, createHybrid, wrapper.placeholder, undefined,
  5814. args, holders, undefined, undefined, arity - length);
  5815. }
  5816. var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
  5817. return apply(fn, this, args);
  5818. }
  5819. return wrapper;
  5820. }
  5821. /**
  5822. * Creates a `_.find` or `_.findLast` function.
  5823. *
  5824. * @private
  5825. * @param {Function} findIndexFunc The function to find the collection index.
  5826. * @returns {Function} Returns the new find function.
  5827. */
  5828. function createFind(findIndexFunc) {
  5829. return function(collection, predicate, fromIndex) {
  5830. var iterable = Object(collection);
  5831. if (!isArrayLike(collection)) {
  5832. var iteratee = getIteratee(predicate, 3);
  5833. collection = keys(collection);
  5834. predicate = function(key) { return iteratee(iterable[key], key, iterable); };
  5835. }
  5836. var index = findIndexFunc(collection, predicate, fromIndex);
  5837. return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
  5838. };
  5839. }
  5840. /**
  5841. * Creates a `_.flow` or `_.flowRight` function.
  5842. *
  5843. * @private
  5844. * @param {boolean} [fromRight] Specify iterating from right to left.
  5845. * @returns {Function} Returns the new flow function.
  5846. */
  5847. function createFlow(fromRight) {
  5848. return flatRest(function(funcs) {
  5849. var length = funcs.length,
  5850. index = length,
  5851. prereq = LodashWrapper.prototype.thru;
  5852. if (fromRight) {
  5853. funcs.reverse();
  5854. }
  5855. while (index--) {
  5856. var func = funcs[index];
  5857. if (typeof func != 'function') {
  5858. throw new TypeError(FUNC_ERROR_TEXT);
  5859. }
  5860. if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
  5861. var wrapper = new LodashWrapper([], true);
  5862. }
  5863. }
  5864. index = wrapper ? index : length;
  5865. while (++index < length) {
  5866. func = funcs[index];
  5867. var funcName = getFuncName(func),
  5868. data = funcName == 'wrapper' ? getData(func) : undefined;
  5869. if (data && isLaziable(data[0]) &&
  5870. data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
  5871. !data[4].length && data[9] == 1
  5872. ) {
  5873. wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
  5874. } else {
  5875. wrapper = (func.length == 1 && isLaziable(func))
  5876. ? wrapper[funcName]()
  5877. : wrapper.thru(func);
  5878. }
  5879. }
  5880. return function() {
  5881. var args = arguments,
  5882. value = args[0];
  5883. if (wrapper && args.length == 1 && isArray(value)) {
  5884. return wrapper.plant(value).value();
  5885. }
  5886. var index = 0,
  5887. result = length ? funcs[index].apply(this, args) : value;
  5888. while (++index < length) {
  5889. result = funcs[index].call(this, result);
  5890. }
  5891. return result;
  5892. };
  5893. });
  5894. }
  5895. /**
  5896. * Creates a function that wraps `func` to invoke it with optional `this`
  5897. * binding of `thisArg`, partial application, and currying.
  5898. *
  5899. * @private
  5900. * @param {Function|string} func The function or method name to wrap.
  5901. * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  5902. * @param {*} [thisArg] The `this` binding of `func`.
  5903. * @param {Array} [partials] The arguments to prepend to those provided to
  5904. * the new function.
  5905. * @param {Array} [holders] The `partials` placeholder indexes.
  5906. * @param {Array} [partialsRight] The arguments to append to those provided
  5907. * to the new function.
  5908. * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
  5909. * @param {Array} [argPos] The argument positions of the new function.
  5910. * @param {number} [ary] The arity cap of `func`.
  5911. * @param {number} [arity] The arity of `func`.
  5912. * @returns {Function} Returns the new wrapped function.
  5913. */
  5914. function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
  5915. var isAry = bitmask & WRAP_ARY_FLAG,
  5916. isBind = bitmask & WRAP_BIND_FLAG,
  5917. isBindKey = bitmask & WRAP_BIND_KEY_FLAG,
  5918. isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
  5919. isFlip = bitmask & WRAP_FLIP_FLAG,
  5920. Ctor = isBindKey ? undefined : createCtor(func);
  5921. function wrapper() {
  5922. var length = arguments.length,
  5923. args = Array(length),
  5924. index = length;
  5925. while (index--) {
  5926. args[index] = arguments[index];
  5927. }
  5928. if (isCurried) {
  5929. var placeholder = getHolder(wrapper),
  5930. holdersCount = countHolders(args, placeholder);
  5931. }
  5932. if (partials) {
  5933. args = composeArgs(args, partials, holders, isCurried);
  5934. }
  5935. if (partialsRight) {
  5936. args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
  5937. }
  5938. length -= holdersCount;
  5939. if (isCurried && length < arity) {
  5940. var newHolders = replaceHolders(args, placeholder);
  5941. return createRecurry(
  5942. func, bitmask, createHybrid, wrapper.placeholder, thisArg,
  5943. args, newHolders, argPos, ary, arity - length
  5944. );
  5945. }
  5946. var thisBinding = isBind ? thisArg : this,
  5947. fn = isBindKey ? thisBinding[func] : func;
  5948. length = args.length;
  5949. if (argPos) {
  5950. args = reorder(args, argPos);
  5951. } else if (isFlip && length > 1) {
  5952. args.reverse();
  5953. }
  5954. if (isAry && ary < length) {
  5955. args.length = ary;
  5956. }
  5957. if (this && this !== root && this instanceof wrapper) {
  5958. fn = Ctor || createCtor(fn);
  5959. }
  5960. return fn.apply(thisBinding, args);
  5961. }
  5962. return wrapper;
  5963. }
  5964. /**
  5965. * Creates a function like `_.invertBy`.
  5966. *
  5967. * @private
  5968. * @param {Function} setter The function to set accumulator values.
  5969. * @param {Function} toIteratee The function to resolve iteratees.
  5970. * @returns {Function} Returns the new inverter function.
  5971. */
  5972. function createInverter(setter, toIteratee) {
  5973. return function(object, iteratee) {
  5974. return baseInverter(object, setter, toIteratee(iteratee), {});
  5975. };
  5976. }
  5977. /**
  5978. * Creates a function that performs a mathematical operation on two values.
  5979. *
  5980. * @private
  5981. * @param {Function} operator The function to perform the operation.
  5982. * @param {number} [defaultValue] The value used for `undefined` arguments.
  5983. * @returns {Function} Returns the new mathematical operation function.
  5984. */
  5985. function createMathOperation(operator, defaultValue) {
  5986. return function(value, other) {
  5987. var result;
  5988. if (value === undefined && other === undefined) {
  5989. return defaultValue;
  5990. }
  5991. if (value !== undefined) {
  5992. result = value;
  5993. }
  5994. if (other !== undefined) {
  5995. if (result === undefined) {
  5996. return other;
  5997. }
  5998. if (typeof value == 'string' || typeof other == 'string') {
  5999. value = baseToString(value);
  6000. other = baseToString(other);
  6001. } else {
  6002. value = baseToNumber(value);
  6003. other = baseToNumber(other);
  6004. }
  6005. result = operator(value, other);
  6006. }
  6007. return result;
  6008. };
  6009. }
  6010. /**
  6011. * Creates a function like `_.over`.
  6012. *
  6013. * @private
  6014. * @param {Function} arrayFunc The function to iterate over iteratees.
  6015. * @returns {Function} Returns the new over function.
  6016. */
  6017. function createOver(arrayFunc) {
  6018. return flatRest(function(iteratees) {
  6019. iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
  6020. return baseRest(function(args) {
  6021. var thisArg = this;
  6022. return arrayFunc(iteratees, function(iteratee) {
  6023. return apply(iteratee, thisArg, args);
  6024. });
  6025. });
  6026. });
  6027. }
  6028. /**
  6029. * Creates the padding for `string` based on `length`. The `chars` string
  6030. * is truncated if the number of characters exceeds `length`.
  6031. *
  6032. * @private
  6033. * @param {number} length The padding length.
  6034. * @param {string} [chars=' '] The string used as padding.
  6035. * @returns {string} Returns the padding for `string`.
  6036. */
  6037. function createPadding(length, chars) {
  6038. chars = chars === undefined ? ' ' : baseToString(chars);
  6039. var charsLength = chars.length;
  6040. if (charsLength < 2) {
  6041. return charsLength ? baseRepeat(chars, length) : chars;
  6042. }
  6043. var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
  6044. return hasUnicode(chars)
  6045. ? castSlice(stringToArray(result), 0, length).join('')
  6046. : result.slice(0, length);
  6047. }
  6048. /**
  6049. * Creates a function that wraps `func` to invoke it with the `this` binding
  6050. * of `thisArg` and `partials` prepended to the arguments it receives.
  6051. *
  6052. * @private
  6053. * @param {Function} func The function to wrap.
  6054. * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  6055. * @param {*} thisArg The `this` binding of `func`.
  6056. * @param {Array} partials The arguments to prepend to those provided to
  6057. * the new function.
  6058. * @returns {Function} Returns the new wrapped function.
  6059. */
  6060. function createPartial(func, bitmask, thisArg, partials) {
  6061. var isBind = bitmask & WRAP_BIND_FLAG,
  6062. Ctor = createCtor(func);
  6063. function wrapper() {
  6064. var argsIndex = -1,
  6065. argsLength = arguments.length,
  6066. leftIndex = -1,
  6067. leftLength = partials.length,
  6068. args = Array(leftLength + argsLength),
  6069. fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
  6070. while (++leftIndex < leftLength) {
  6071. args[leftIndex] = partials[leftIndex];
  6072. }
  6073. while (argsLength--) {
  6074. args[leftIndex++] = arguments[++argsIndex];
  6075. }
  6076. return apply(fn, isBind ? thisArg : this, args);
  6077. }
  6078. return wrapper;
  6079. }
  6080. /**
  6081. * Creates a `_.range` or `_.rangeRight` function.
  6082. *
  6083. * @private
  6084. * @param {boolean} [fromRight] Specify iterating from right to left.
  6085. * @returns {Function} Returns the new range function.
  6086. */
  6087. function createRange(fromRight) {
  6088. return function(start, end, step) {
  6089. if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
  6090. end = step = undefined;
  6091. }
  6092. // Ensure the sign of `-0` is preserved.
  6093. start = toFinite(start);
  6094. if (end === undefined) {
  6095. end = start;
  6096. start = 0;
  6097. } else {
  6098. end = toFinite(end);
  6099. }
  6100. step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
  6101. return baseRange(start, end, step, fromRight);
  6102. };
  6103. }
  6104. /**
  6105. * Creates a function that performs a relational operation on two values.
  6106. *
  6107. * @private
  6108. * @param {Function} operator The function to perform the operation.
  6109. * @returns {Function} Returns the new relational operation function.
  6110. */
  6111. function createRelationalOperation(operator) {
  6112. return function(value, other) {
  6113. if (!(typeof value == 'string' && typeof other == 'string')) {
  6114. value = toNumber(value);
  6115. other = toNumber(other);
  6116. }
  6117. return operator(value, other);
  6118. };
  6119. }
  6120. /**
  6121. * Creates a function that wraps `func` to continue currying.
  6122. *
  6123. * @private
  6124. * @param {Function} func The function to wrap.
  6125. * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  6126. * @param {Function} wrapFunc The function to create the `func` wrapper.
  6127. * @param {*} placeholder The placeholder value.
  6128. * @param {*} [thisArg] The `this` binding of `func`.
  6129. * @param {Array} [partials] The arguments to prepend to those provided to
  6130. * the new function.
  6131. * @param {Array} [holders] The `partials` placeholder indexes.
  6132. * @param {Array} [argPos] The argument positions of the new function.
  6133. * @param {number} [ary] The arity cap of `func`.
  6134. * @param {number} [arity] The arity of `func`.
  6135. * @returns {Function} Returns the new wrapped function.
  6136. */
  6137. function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
  6138. var isCurry = bitmask & WRAP_CURRY_FLAG,
  6139. newHolders = isCurry ? holders : undefined,
  6140. newHoldersRight = isCurry ? undefined : holders,
  6141. newPartials = isCurry ? partials : undefined,
  6142. newPartialsRight = isCurry ? undefined : partials;
  6143. bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
  6144. bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);
  6145. if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {
  6146. bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
  6147. }
  6148. var newData = [
  6149. func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
  6150. newHoldersRight, argPos, ary, arity
  6151. ];
  6152. var result = wrapFunc.apply(undefined, newData);
  6153. if (isLaziable(func)) {
  6154. setData(result, newData);
  6155. }
  6156. result.placeholder = placeholder;
  6157. return setWrapToString(result, func, bitmask);
  6158. }
  6159. /**
  6160. * Creates a function like `_.round`.
  6161. *
  6162. * @private
  6163. * @param {string} methodName The name of the `Math` method to use when rounding.
  6164. * @returns {Function} Returns the new round function.
  6165. */
  6166. function createRound(methodName) {
  6167. var func = Math[methodName];
  6168. return function(number, precision) {
  6169. number = toNumber(number);
  6170. precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
  6171. if (precision && nativeIsFinite(number)) {
  6172. // Shift with exponential notation to avoid floating-point issues.
  6173. // See [MDN](https://mdn.io/round#Examples) for more details.
  6174. var pair = (toString(number) + 'e').split('e'),
  6175. value = func(pair[0] + 'e' + (+pair[1] + precision));
  6176. pair = (toString(value) + 'e').split('e');
  6177. return +(pair[0] + 'e' + (+pair[1] - precision));
  6178. }
  6179. return func(number);
  6180. };
  6181. }
  6182. /**
  6183. * Creates a set object of `values`.
  6184. *
  6185. * @private
  6186. * @param {Array} values The values to add to the set.
  6187. * @returns {Object} Returns the new set.
  6188. */
  6189. var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
  6190. return new Set(values);
  6191. };
  6192. /**
  6193. * Creates a `_.toPairs` or `_.toPairsIn` function.
  6194. *
  6195. * @private
  6196. * @param {Function} keysFunc The function to get the keys of a given object.
  6197. * @returns {Function} Returns the new pairs function.
  6198. */
  6199. function createToPairs(keysFunc) {
  6200. return function(object) {
  6201. var tag = getTag(object);
  6202. if (tag == mapTag) {
  6203. return mapToArray(object);
  6204. }
  6205. if (tag == setTag) {
  6206. return setToPairs(object);
  6207. }
  6208. return baseToPairs(object, keysFunc(object));
  6209. };
  6210. }
  6211. /**
  6212. * Creates a function that either curries or invokes `func` with optional
  6213. * `this` binding and partially applied arguments.
  6214. *
  6215. * @private
  6216. * @param {Function|string} func The function or method name to wrap.
  6217. * @param {number} bitmask The bitmask flags.
  6218. * 1 - `_.bind`
  6219. * 2 - `_.bindKey`
  6220. * 4 - `_.curry` or `_.curryRight` of a bound function
  6221. * 8 - `_.curry`
  6222. * 16 - `_.curryRight`
  6223. * 32 - `_.partial`
  6224. * 64 - `_.partialRight`
  6225. * 128 - `_.rearg`
  6226. * 256 - `_.ary`
  6227. * 512 - `_.flip`
  6228. * @param {*} [thisArg] The `this` binding of `func`.
  6229. * @param {Array} [partials] The arguments to be partially applied.
  6230. * @param {Array} [holders] The `partials` placeholder indexes.
  6231. * @param {Array} [argPos] The argument positions of the new function.
  6232. * @param {number} [ary] The arity cap of `func`.
  6233. * @param {number} [arity] The arity of `func`.
  6234. * @returns {Function} Returns the new wrapped function.
  6235. */
  6236. function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
  6237. var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
  6238. if (!isBindKey && typeof func != 'function') {
  6239. throw new TypeError(FUNC_ERROR_TEXT);
  6240. }
  6241. var length = partials ? partials.length : 0;
  6242. if (!length) {
  6243. bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
  6244. partials = holders = undefined;
  6245. }
  6246. ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
  6247. arity = arity === undefined ? arity : toInteger(arity);
  6248. length -= holders ? holders.length : 0;
  6249. if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
  6250. var partialsRight = partials,
  6251. holdersRight = holders;
  6252. partials = holders = undefined;
  6253. }
  6254. var data = isBindKey ? undefined : getData(func);
  6255. var newData = [
  6256. func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
  6257. argPos, ary, arity
  6258. ];
  6259. if (data) {
  6260. mergeData(newData, data);
  6261. }
  6262. func = newData[0];
  6263. bitmask = newData[1];
  6264. thisArg = newData[2];
  6265. partials = newData[3];
  6266. holders = newData[4];
  6267. arity = newData[9] = newData[9] === undefined
  6268. ? (isBindKey ? 0 : func.length)
  6269. : nativeMax(newData[9] - length, 0);
  6270. if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
  6271. bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
  6272. }
  6273. if (!bitmask || bitmask == WRAP_BIND_FLAG) {
  6274. var result = createBind(func, bitmask, thisArg);
  6275. } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
  6276. result = createCurry(func, bitmask, arity);
  6277. } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
  6278. result = createPartial(func, bitmask, thisArg, partials);
  6279. } else {
  6280. result = createHybrid.apply(undefined, newData);
  6281. }
  6282. var setter = data ? baseSetData : setData;
  6283. return setWrapToString(setter(result, newData), func, bitmask);
  6284. }
  6285. /**
  6286. * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
  6287. * of source objects to the destination object for all destination properties
  6288. * that resolve to `undefined`.
  6289. *
  6290. * @private
  6291. * @param {*} objValue The destination value.
  6292. * @param {*} srcValue The source value.
  6293. * @param {string} key The key of the property to assign.
  6294. * @param {Object} object The parent object of `objValue`.
  6295. * @returns {*} Returns the value to assign.
  6296. */
  6297. function customDefaultsAssignIn(objValue, srcValue, key, object) {
  6298. if (objValue === undefined ||
  6299. (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
  6300. return srcValue;
  6301. }
  6302. return objValue;
  6303. }
  6304. /**
  6305. * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
  6306. * objects into destination objects that are passed thru.
  6307. *
  6308. * @private
  6309. * @param {*} objValue The destination value.
  6310. * @param {*} srcValue The source value.
  6311. * @param {string} key The key of the property to merge.
  6312. * @param {Object} object The parent object of `objValue`.
  6313. * @param {Object} source The parent object of `srcValue`.
  6314. * @param {Object} [stack] Tracks traversed source values and their merged
  6315. * counterparts.
  6316. * @returns {*} Returns the value to assign.
  6317. */
  6318. function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
  6319. if (isObject(objValue) && isObject(srcValue)) {
  6320. // Recursively merge objects and arrays (susceptible to call stack limits).
  6321. stack.set(srcValue, objValue);
  6322. baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
  6323. stack['delete'](srcValue);
  6324. }
  6325. return objValue;
  6326. }
  6327. /**
  6328. * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
  6329. * objects.
  6330. *
  6331. * @private
  6332. * @param {*} value The value to inspect.
  6333. * @param {string} key The key of the property to inspect.
  6334. * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
  6335. */
  6336. function customOmitClone(value) {
  6337. return isPlainObject(value) ? undefined : value;
  6338. }
  6339. /**
  6340. * A specialized version of `baseIsEqualDeep` for arrays with support for
  6341. * partial deep comparisons.
  6342. *
  6343. * @private
  6344. * @param {Array} array The array to compare.
  6345. * @param {Array} other The other array to compare.
  6346. * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
  6347. * @param {Function} customizer The function to customize comparisons.
  6348. * @param {Function} equalFunc The function to determine equivalents of values.
  6349. * @param {Object} stack Tracks traversed `array` and `other` objects.
  6350. * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
  6351. */
  6352. function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
  6353. var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
  6354. arrLength = array.length,
  6355. othLength = other.length;
  6356. if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
  6357. return false;
  6358. }
  6359. // Check that cyclic values are equal.
  6360. var arrStacked = stack.get(array);
  6361. var othStacked = stack.get(other);
  6362. if (arrStacked && othStacked) {
  6363. return arrStacked == other && othStacked == array;
  6364. }
  6365. var index = -1,
  6366. result = true,
  6367. seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;
  6368. stack.set(array, other);
  6369. stack.set(other, array);
  6370. // Ignore non-index properties.
  6371. while (++index < arrLength) {
  6372. var arrValue = array[index],
  6373. othValue = other[index];
  6374. if (customizer) {
  6375. var compared = isPartial
  6376. ? customizer(othValue, arrValue, index, other, array, stack)
  6377. : customizer(arrValue, othValue, index, array, other, stack);
  6378. }
  6379. if (compared !== undefined) {
  6380. if (compared) {
  6381. continue;
  6382. }
  6383. result = false;
  6384. break;
  6385. }
  6386. // Recursively compare arrays (susceptible to call stack limits).
  6387. if (seen) {
  6388. if (!arraySome(other, function(othValue, othIndex) {
  6389. if (!cacheHas(seen, othIndex) &&
  6390. (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
  6391. return seen.push(othIndex);
  6392. }
  6393. })) {
  6394. result = false;
  6395. break;
  6396. }
  6397. } else if (!(
  6398. arrValue === othValue ||
  6399. equalFunc(arrValue, othValue, bitmask, customizer, stack)
  6400. )) {
  6401. result = false;
  6402. break;
  6403. }
  6404. }
  6405. stack['delete'](array);
  6406. stack['delete'](other);
  6407. return result;
  6408. }
  6409. /**
  6410. * A specialized version of `baseIsEqualDeep` for comparing objects of
  6411. * the same `toStringTag`.
  6412. *
  6413. * **Note:** This function only supports comparing values with tags of
  6414. * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
  6415. *
  6416. * @private
  6417. * @param {Object} object The object to compare.
  6418. * @param {Object} other The other object to compare.
  6419. * @param {string} tag The `toStringTag` of the objects to compare.
  6420. * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
  6421. * @param {Function} customizer The function to customize comparisons.
  6422. * @param {Function} equalFunc The function to determine equivalents of values.
  6423. * @param {Object} stack Tracks traversed `object` and `other` objects.
  6424. * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
  6425. */
  6426. function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
  6427. switch (tag) {
  6428. case dataViewTag:
  6429. if ((object.byteLength != other.byteLength) ||
  6430. (object.byteOffset != other.byteOffset)) {
  6431. return false;
  6432. }
  6433. object = object.buffer;
  6434. other = other.buffer;
  6435. case arrayBufferTag:
  6436. if ((object.byteLength != other.byteLength) ||
  6437. !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
  6438. return false;
  6439. }
  6440. return true;
  6441. case boolTag:
  6442. case dateTag:
  6443. case numberTag:
  6444. // Coerce booleans to `1` or `0` and dates to milliseconds.
  6445. // Invalid dates are coerced to `NaN`.
  6446. return eq(+object, +other);
  6447. case errorTag:
  6448. return object.name == other.name && object.message == other.message;
  6449. case regexpTag:
  6450. case stringTag:
  6451. // Coerce regexes to strings and treat strings, primitives and objects,
  6452. // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
  6453. // for more details.
  6454. return object == (other + '');
  6455. case mapTag:
  6456. var convert = mapToArray;
  6457. case setTag:
  6458. var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
  6459. convert || (convert = setToArray);
  6460. if (object.size != other.size && !isPartial) {
  6461. return false;
  6462. }
  6463. // Assume cyclic values are equal.
  6464. var stacked = stack.get(object);
  6465. if (stacked) {
  6466. return stacked == other;
  6467. }
  6468. bitmask |= COMPARE_UNORDERED_FLAG;
  6469. // Recursively compare objects (susceptible to call stack limits).
  6470. stack.set(object, other);
  6471. var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
  6472. stack['delete'](object);
  6473. return result;
  6474. case symbolTag:
  6475. if (symbolValueOf) {
  6476. return symbolValueOf.call(object) == symbolValueOf.call(other);
  6477. }
  6478. }
  6479. return false;
  6480. }
  6481. /**
  6482. * A specialized version of `baseIsEqualDeep` for objects with support for
  6483. * partial deep comparisons.
  6484. *
  6485. * @private
  6486. * @param {Object} object The object to compare.
  6487. * @param {Object} other The other object to compare.
  6488. * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
  6489. * @param {Function} customizer The function to customize comparisons.
  6490. * @param {Function} equalFunc The function to determine equivalents of values.
  6491. * @param {Object} stack Tracks traversed `object` and `other` objects.
  6492. * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
  6493. */
  6494. function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
  6495. var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
  6496. objProps = getAllKeys(object),
  6497. objLength = objProps.length,
  6498. othProps = getAllKeys(other),
  6499. othLength = othProps.length;
  6500. if (objLength != othLength && !isPartial) {
  6501. return false;
  6502. }
  6503. var index = objLength;
  6504. while (index--) {
  6505. var key = objProps[index];
  6506. if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
  6507. return false;
  6508. }
  6509. }
  6510. // Check that cyclic values are equal.
  6511. var objStacked = stack.get(object);
  6512. var othStacked = stack.get(other);
  6513. if (objStacked && othStacked) {
  6514. return objStacked == other && othStacked == object;
  6515. }
  6516. var result = true;
  6517. stack.set(object, other);
  6518. stack.set(other, object);
  6519. var skipCtor = isPartial;
  6520. while (++index < objLength) {
  6521. key = objProps[index];
  6522. var objValue = object[key],
  6523. othValue = other[key];
  6524. if (customizer) {
  6525. var compared = isPartial
  6526. ? customizer(othValue, objValue, key, other, object, stack)
  6527. : customizer(objValue, othValue, key, object, other, stack);
  6528. }
  6529. // Recursively compare objects (susceptible to call stack limits).
  6530. if (!(compared === undefined
  6531. ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
  6532. : compared
  6533. )) {
  6534. result = false;
  6535. break;
  6536. }
  6537. skipCtor || (skipCtor = key == 'constructor');
  6538. }
  6539. if (result && !skipCtor) {
  6540. var objCtor = object.constructor,
  6541. othCtor = other.constructor;
  6542. // Non `Object` object instances with different constructors are not equal.
  6543. if (objCtor != othCtor &&
  6544. ('constructor' in object && 'constructor' in other) &&
  6545. !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
  6546. typeof othCtor == 'function' && othCtor instanceof othCtor)) {
  6547. result = false;
  6548. }
  6549. }
  6550. stack['delete'](object);
  6551. stack['delete'](other);
  6552. return result;
  6553. }
  6554. /**
  6555. * A specialized version of `baseRest` which flattens the rest array.
  6556. *
  6557. * @private
  6558. * @param {Function} func The function to apply a rest parameter to.
  6559. * @returns {Function} Returns the new function.
  6560. */
  6561. function flatRest(func) {
  6562. return setToString(overRest(func, undefined, flatten), func + '');
  6563. }
  6564. /**
  6565. * Creates an array of own enumerable property names and symbols of `object`.
  6566. *
  6567. * @private
  6568. * @param {Object} object The object to query.
  6569. * @returns {Array} Returns the array of property names and symbols.
  6570. */
  6571. function getAllKeys(object) {
  6572. return baseGetAllKeys(object, keys, getSymbols);
  6573. }
  6574. /**
  6575. * Creates an array of own and inherited enumerable property names and
  6576. * symbols of `object`.
  6577. *
  6578. * @private
  6579. * @param {Object} object The object to query.
  6580. * @returns {Array} Returns the array of property names and symbols.
  6581. */
  6582. function getAllKeysIn(object) {
  6583. return baseGetAllKeys(object, keysIn, getSymbolsIn);
  6584. }
  6585. /**
  6586. * Gets metadata for `func`.
  6587. *
  6588. * @private
  6589. * @param {Function} func The function to query.
  6590. * @returns {*} Returns the metadata for `func`.
  6591. */
  6592. var getData = !metaMap ? noop : function(func) {
  6593. return metaMap.get(func);
  6594. };
  6595. /**
  6596. * Gets the name of `func`.
  6597. *
  6598. * @private
  6599. * @param {Function} func The function to query.
  6600. * @returns {string} Returns the function name.
  6601. */
  6602. function getFuncName(func) {
  6603. var result = (func.name + ''),
  6604. array = realNames[result],
  6605. length = hasOwnProperty.call(realNames, result) ? array.length : 0;
  6606. while (length--) {
  6607. var data = array[length],
  6608. otherFunc = data.func;
  6609. if (otherFunc == null || otherFunc == func) {
  6610. return data.name;
  6611. }
  6612. }
  6613. return result;
  6614. }
  6615. /**
  6616. * Gets the argument placeholder value for `func`.
  6617. *
  6618. * @private
  6619. * @param {Function} func The function to inspect.
  6620. * @returns {*} Returns the placeholder value.
  6621. */
  6622. function getHolder(func) {
  6623. var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;
  6624. return object.placeholder;
  6625. }
  6626. /**
  6627. * Gets the appropriate "iteratee" function. If `_.iteratee` is customized,
  6628. * this function returns the custom method, otherwise it returns `baseIteratee`.
  6629. * If arguments are provided, the chosen function is invoked with them and
  6630. * its result is returned.
  6631. *
  6632. * @private
  6633. * @param {*} [value] The value to convert to an iteratee.
  6634. * @param {number} [arity] The arity of the created iteratee.
  6635. * @returns {Function} Returns the chosen function or its result.
  6636. */
  6637. function getIteratee() {
  6638. var result = lodash.iteratee || iteratee;
  6639. result = result === iteratee ? baseIteratee : result;
  6640. return arguments.length ? result(arguments[0], arguments[1]) : result;
  6641. }
  6642. /**
  6643. * Gets the data for `map`.
  6644. *
  6645. * @private
  6646. * @param {Object} map The map to query.
  6647. * @param {string} key The reference key.
  6648. * @returns {*} Returns the map data.
  6649. */
  6650. function getMapData(map, key) {
  6651. var data = map.__data__;
  6652. return isKeyable(key)
  6653. ? data[typeof key == 'string' ? 'string' : 'hash']
  6654. : data.map;
  6655. }
  6656. /**
  6657. * Gets the property names, values, and compare flags of `object`.
  6658. *
  6659. * @private
  6660. * @param {Object} object The object to query.
  6661. * @returns {Array} Returns the match data of `object`.
  6662. */
  6663. function getMatchData(object) {
  6664. var result = keys(object),
  6665. length = result.length;
  6666. while (length--) {
  6667. var key = result[length],
  6668. value = object[key];
  6669. result[length] = [key, value, isStrictComparable(value)];
  6670. }
  6671. return result;
  6672. }
  6673. /**
  6674. * Gets the native function at `key` of `object`.
  6675. *
  6676. * @private
  6677. * @param {Object} object The object to query.
  6678. * @param {string} key The key of the method to get.
  6679. * @returns {*} Returns the function if it's native, else `undefined`.
  6680. */
  6681. function getNative(object, key) {
  6682. var value = getValue(object, key);
  6683. return baseIsNative(value) ? value : undefined;
  6684. }
  6685. /**
  6686. * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
  6687. *
  6688. * @private
  6689. * @param {*} value The value to query.
  6690. * @returns {string} Returns the raw `toStringTag`.
  6691. */
  6692. function getRawTag(value) {
  6693. var isOwn = hasOwnProperty.call(value, symToStringTag),
  6694. tag = value[symToStringTag];
  6695. try {
  6696. value[symToStringTag] = undefined;
  6697. var unmasked = true;
  6698. } catch (e) {}
  6699. var result = nativeObjectToString.call(value);
  6700. if (unmasked) {
  6701. if (isOwn) {
  6702. value[symToStringTag] = tag;
  6703. } else {
  6704. delete value[symToStringTag];
  6705. }
  6706. }
  6707. return result;
  6708. }
  6709. /**
  6710. * Creates an array of the own enumerable symbols of `object`.
  6711. *
  6712. * @private
  6713. * @param {Object} object The object to query.
  6714. * @returns {Array} Returns the array of symbols.
  6715. */
  6716. var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
  6717. if (object == null) {
  6718. return [];
  6719. }
  6720. object = Object(object);
  6721. return arrayFilter(nativeGetSymbols(object), function(symbol) {
  6722. return propertyIsEnumerable.call(object, symbol);
  6723. });
  6724. };
  6725. /**
  6726. * Creates an array of the own and inherited enumerable symbols of `object`.
  6727. *
  6728. * @private
  6729. * @param {Object} object The object to query.
  6730. * @returns {Array} Returns the array of symbols.
  6731. */
  6732. var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
  6733. var result = [];
  6734. while (object) {
  6735. arrayPush(result, getSymbols(object));
  6736. object = getPrototype(object);
  6737. }
  6738. return result;
  6739. };
  6740. /**
  6741. * Gets the `toStringTag` of `value`.
  6742. *
  6743. * @private
  6744. * @param {*} value The value to query.
  6745. * @returns {string} Returns the `toStringTag`.
  6746. */
  6747. var getTag = baseGetTag;
  6748. // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
  6749. if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
  6750. (Map && getTag(new Map) != mapTag) ||
  6751. (Promise && getTag(Promise.resolve()) != promiseTag) ||
  6752. (Set && getTag(new Set) != setTag) ||
  6753. (WeakMap && getTag(new WeakMap) != weakMapTag)) {
  6754. getTag = function(value) {
  6755. var result = baseGetTag(value),
  6756. Ctor = result == objectTag ? value.constructor : undefined,
  6757. ctorString = Ctor ? toSource(Ctor) : '';
  6758. if (ctorString) {
  6759. switch (ctorString) {
  6760. case dataViewCtorString: return dataViewTag;
  6761. case mapCtorString: return mapTag;
  6762. case promiseCtorString: return promiseTag;
  6763. case setCtorString: return setTag;
  6764. case weakMapCtorString: return weakMapTag;
  6765. }
  6766. }
  6767. return result;
  6768. };
  6769. }
  6770. /**
  6771. * Gets the view, applying any `transforms` to the `start` and `end` positions.
  6772. *
  6773. * @private
  6774. * @param {number} start The start of the view.
  6775. * @param {number} end The end of the view.
  6776. * @param {Array} transforms The transformations to apply to the view.
  6777. * @returns {Object} Returns an object containing the `start` and `end`
  6778. * positions of the view.
  6779. */
  6780. function getView(start, end, transforms) {
  6781. var index = -1,
  6782. length = transforms.length;
  6783. while (++index < length) {
  6784. var data = transforms[index],
  6785. size = data.size;
  6786. switch (data.type) {
  6787. case 'drop': start += size; break;
  6788. case 'dropRight': end -= size; break;
  6789. case 'take': end = nativeMin(end, start + size); break;
  6790. case 'takeRight': start = nativeMax(start, end - size); break;
  6791. }
  6792. }
  6793. return { 'start': start, 'end': end };
  6794. }
  6795. /**
  6796. * Extracts wrapper details from the `source` body comment.
  6797. *
  6798. * @private
  6799. * @param {string} source The source to inspect.
  6800. * @returns {Array} Returns the wrapper details.
  6801. */
  6802. function getWrapDetails(source) {
  6803. var match = source.match(reWrapDetails);
  6804. return match ? match[1].split(reSplitDetails) : [];
  6805. }
  6806. /**
  6807. * Checks if `path` exists on `object`.
  6808. *
  6809. * @private
  6810. * @param {Object} object The object to query.
  6811. * @param {Array|string} path The path to check.
  6812. * @param {Function} hasFunc The function to check properties.
  6813. * @returns {boolean} Returns `true` if `path` exists, else `false`.
  6814. */
  6815. function hasPath(object, path, hasFunc) {
  6816. path = castPath(path, object);
  6817. var index = -1,
  6818. length = path.length,
  6819. result = false;
  6820. while (++index < length) {
  6821. var key = toKey(path[index]);
  6822. if (!(result = object != null && hasFunc(object, key))) {
  6823. break;
  6824. }
  6825. object = object[key];
  6826. }
  6827. if (result || ++index != length) {
  6828. return result;
  6829. }
  6830. length = object == null ? 0 : object.length;
  6831. return !!length && isLength(length) && isIndex(key, length) &&
  6832. (isArray(object) || isArguments(object));
  6833. }
  6834. /**
  6835. * Initializes an array clone.
  6836. *
  6837. * @private
  6838. * @param {Array} array The array to clone.
  6839. * @returns {Array} Returns the initialized clone.
  6840. */
  6841. function initCloneArray(array) {
  6842. var length = array.length,
  6843. result = new array.constructor(length);
  6844. // Add properties assigned by `RegExp#exec`.
  6845. if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
  6846. result.index = array.index;
  6847. result.input = array.input;
  6848. }
  6849. return result;
  6850. }
  6851. /**
  6852. * Initializes an object clone.
  6853. *
  6854. * @private
  6855. * @param {Object} object The object to clone.
  6856. * @returns {Object} Returns the initialized clone.
  6857. */
  6858. function initCloneObject(object) {
  6859. return (typeof object.constructor == 'function' && !isPrototype(object))
  6860. ? baseCreate(getPrototype(object))
  6861. : {};
  6862. }
  6863. /**
  6864. * Initializes an object clone based on its `toStringTag`.
  6865. *
  6866. * **Note:** This function only supports cloning values with tags of
  6867. * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.
  6868. *
  6869. * @private
  6870. * @param {Object} object The object to clone.
  6871. * @param {string} tag The `toStringTag` of the object to clone.
  6872. * @param {boolean} [isDeep] Specify a deep clone.
  6873. * @returns {Object} Returns the initialized clone.
  6874. */
  6875. function initCloneByTag(object, tag, isDeep) {
  6876. var Ctor = object.constructor;
  6877. switch (tag) {
  6878. case arrayBufferTag:
  6879. return cloneArrayBuffer(object);
  6880. case boolTag:
  6881. case dateTag:
  6882. return new Ctor(+object);
  6883. case dataViewTag:
  6884. return cloneDataView(object, isDeep);
  6885. case float32Tag: case float64Tag:
  6886. case int8Tag: case int16Tag: case int32Tag:
  6887. case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
  6888. return cloneTypedArray(object, isDeep);
  6889. case mapTag:
  6890. return new Ctor;
  6891. case numberTag:
  6892. case stringTag:
  6893. return new Ctor(object);
  6894. case regexpTag:
  6895. return cloneRegExp(object);
  6896. case setTag:
  6897. return new Ctor;
  6898. case symbolTag:
  6899. return cloneSymbol(object);
  6900. }
  6901. }
  6902. /**
  6903. * Inserts wrapper `details` in a comment at the top of the `source` body.
  6904. *
  6905. * @private
  6906. * @param {string} source The source to modify.
  6907. * @returns {Array} details The details to insert.
  6908. * @returns {string} Returns the modified source.
  6909. */
  6910. function insertWrapDetails(source, details) {
  6911. var length = details.length;
  6912. if (!length) {
  6913. return source;
  6914. }
  6915. var lastIndex = length - 1;
  6916. details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
  6917. details = details.join(length > 2 ? ', ' : ' ');
  6918. return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
  6919. }
  6920. /**
  6921. * Checks if `value` is a flattenable `arguments` object or array.
  6922. *
  6923. * @private
  6924. * @param {*} value The value to check.
  6925. * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
  6926. */
  6927. function isFlattenable(value) {
  6928. return isArray(value) || isArguments(value) ||
  6929. !!(spreadableSymbol && value && value[spreadableSymbol]);
  6930. }
  6931. /**
  6932. * Checks if `value` is a valid array-like index.
  6933. *
  6934. * @private
  6935. * @param {*} value The value to check.
  6936. * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
  6937. * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
  6938. */
  6939. function isIndex(value, length) {
  6940. var type = typeof value;
  6941. length = length == null ? MAX_SAFE_INTEGER : length;
  6942. return !!length &&
  6943. (type == 'number' ||
  6944. (type != 'symbol' && reIsUint.test(value))) &&
  6945. (value > -1 && value % 1 == 0 && value < length);
  6946. }
  6947. /**
  6948. * Checks if the given arguments are from an iteratee call.
  6949. *
  6950. * @private
  6951. * @param {*} value The potential iteratee value argument.
  6952. * @param {*} index The potential iteratee index or key argument.
  6953. * @param {*} object The potential iteratee object argument.
  6954. * @returns {boolean} Returns `true` if the arguments are from an iteratee call,
  6955. * else `false`.
  6956. */
  6957. function isIterateeCall(value, index, object) {
  6958. if (!isObject(object)) {
  6959. return false;
  6960. }
  6961. var type = typeof index;
  6962. if (type == 'number'
  6963. ? (isArrayLike(object) && isIndex(index, object.length))
  6964. : (type == 'string' && index in object)
  6965. ) {
  6966. return eq(object[index], value);
  6967. }
  6968. return false;
  6969. }
  6970. /**
  6971. * Checks if `value` is a property name and not a property path.
  6972. *
  6973. * @private
  6974. * @param {*} value The value to check.
  6975. * @param {Object} [object] The object to query keys on.
  6976. * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
  6977. */
  6978. function isKey(value, object) {
  6979. if (isArray(value)) {
  6980. return false;
  6981. }
  6982. var type = typeof value;
  6983. if (type == 'number' || type == 'symbol' || type == 'boolean' ||
  6984. value == null || isSymbol(value)) {
  6985. return true;
  6986. }
  6987. return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
  6988. (object != null && value in Object(object));
  6989. }
  6990. /**
  6991. * Checks if `value` is suitable for use as unique object key.
  6992. *
  6993. * @private
  6994. * @param {*} value The value to check.
  6995. * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
  6996. */
  6997. function isKeyable(value) {
  6998. var type = typeof value;
  6999. return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
  7000. ? (value !== '__proto__')
  7001. : (value === null);
  7002. }
  7003. /**
  7004. * Checks if `func` has a lazy counterpart.
  7005. *
  7006. * @private
  7007. * @param {Function} func The function to check.
  7008. * @returns {boolean} Returns `true` if `func` has a lazy counterpart,
  7009. * else `false`.
  7010. */
  7011. function isLaziable(func) {
  7012. var funcName = getFuncName(func),
  7013. other = lodash[funcName];
  7014. if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
  7015. return false;
  7016. }
  7017. if (func === other) {
  7018. return true;
  7019. }
  7020. var data = getData(other);
  7021. return !!data && func === data[0];
  7022. }
  7023. /**
  7024. * Checks if `func` has its source masked.
  7025. *
  7026. * @private
  7027. * @param {Function} func The function to check.
  7028. * @returns {boolean} Returns `true` if `func` is masked, else `false`.
  7029. */
  7030. function isMasked(func) {
  7031. return !!maskSrcKey && (maskSrcKey in func);
  7032. }
  7033. /**
  7034. * Checks if `func` is capable of being masked.
  7035. *
  7036. * @private
  7037. * @param {*} value The value to check.
  7038. * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
  7039. */
  7040. var isMaskable = coreJsData ? isFunction : stubFalse;
  7041. /**
  7042. * Checks if `value` is likely a prototype object.
  7043. *
  7044. * @private
  7045. * @param {*} value The value to check.
  7046. * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
  7047. */
  7048. function isPrototype(value) {
  7049. var Ctor = value && value.constructor,
  7050. proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;
  7051. return value === proto;
  7052. }
  7053. /**
  7054. * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
  7055. *
  7056. * @private
  7057. * @param {*} value The value to check.
  7058. * @returns {boolean} Returns `true` if `value` if suitable for strict
  7059. * equality comparisons, else `false`.
  7060. */
  7061. function isStrictComparable(value) {
  7062. return value === value && !isObject(value);
  7063. }
  7064. /**
  7065. * A specialized version of `matchesProperty` for source values suitable
  7066. * for strict equality comparisons, i.e. `===`.
  7067. *
  7068. * @private
  7069. * @param {string} key The key of the property to get.
  7070. * @param {*} srcValue The value to match.
  7071. * @returns {Function} Returns the new spec function.
  7072. */
  7073. function matchesStrictComparable(key, srcValue) {
  7074. return function(object) {
  7075. if (object == null) {
  7076. return false;
  7077. }
  7078. return object[key] === srcValue &&
  7079. (srcValue !== undefined || (key in Object(object)));
  7080. };
  7081. }
  7082. /**
  7083. * A specialized version of `_.memoize` which clears the memoized function's
  7084. * cache when it exceeds `MAX_MEMOIZE_SIZE`.
  7085. *
  7086. * @private
  7087. * @param {Function} func The function to have its output memoized.
  7088. * @returns {Function} Returns the new memoized function.
  7089. */
  7090. function memoizeCapped(func) {
  7091. var result = memoize(func, function(key) {
  7092. if (cache.size === MAX_MEMOIZE_SIZE) {
  7093. cache.clear();
  7094. }
  7095. return key;
  7096. });
  7097. var cache = result.cache;
  7098. return result;
  7099. }
  7100. /**
  7101. * Merges the function metadata of `source` into `data`.
  7102. *
  7103. * Merging metadata reduces the number of wrappers used to invoke a function.
  7104. * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
  7105. * may be applied regardless of execution order. Methods like `_.ary` and
  7106. * `_.rearg` modify function arguments, making the order in which they are
  7107. * executed important, preventing the merging of metadata. However, we make
  7108. * an exception for a safe combined case where curried functions have `_.ary`
  7109. * and or `_.rearg` applied.
  7110. *
  7111. * @private
  7112. * @param {Array} data The destination metadata.
  7113. * @param {Array} source The source metadata.
  7114. * @returns {Array} Returns `data`.
  7115. */
  7116. function mergeData(data, source) {
  7117. var bitmask = data[1],
  7118. srcBitmask = source[1],
  7119. newBitmask = bitmask | srcBitmask,
  7120. isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);
  7121. var isCombo =
  7122. ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
  7123. ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
  7124. ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));
  7125. // Exit early if metadata can't be merged.
  7126. if (!(isCommon || isCombo)) {
  7127. return data;
  7128. }
  7129. // Use source `thisArg` if available.
  7130. if (srcBitmask & WRAP_BIND_FLAG) {
  7131. data[2] = source[2];
  7132. // Set when currying a bound function.
  7133. newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
  7134. }
  7135. // Compose partial arguments.
  7136. var value = source[3];
  7137. if (value) {
  7138. var partials = data[3];
  7139. data[3] = partials ? composeArgs(partials, value, source[4]) : value;
  7140. data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
  7141. }
  7142. // Compose partial right arguments.
  7143. value = source[5];
  7144. if (value) {
  7145. partials = data[5];
  7146. data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
  7147. data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
  7148. }
  7149. // Use source `argPos` if available.
  7150. value = source[7];
  7151. if (value) {
  7152. data[7] = value;
  7153. }
  7154. // Use source `ary` if it's smaller.
  7155. if (srcBitmask & WRAP_ARY_FLAG) {
  7156. data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
  7157. }
  7158. // Use source `arity` if one is not provided.
  7159. if (data[9] == null) {
  7160. data[9] = source[9];
  7161. }
  7162. // Use source `func` and merge bitmasks.
  7163. data[0] = source[0];
  7164. data[1] = newBitmask;
  7165. return data;
  7166. }
  7167. /**
  7168. * This function is like
  7169. * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
  7170. * except that it includes inherited enumerable properties.
  7171. *
  7172. * @private
  7173. * @param {Object} object The object to query.
  7174. * @returns {Array} Returns the array of property names.
  7175. */
  7176. function nativeKeysIn(object) {
  7177. var result = [];
  7178. if (object != null) {
  7179. for (var key in Object(object)) {
  7180. result.push(key);
  7181. }
  7182. }
  7183. return result;
  7184. }
  7185. /**
  7186. * Converts `value` to a string using `Object.prototype.toString`.
  7187. *
  7188. * @private
  7189. * @param {*} value The value to convert.
  7190. * @returns {string} Returns the converted string.
  7191. */
  7192. function objectToString(value) {
  7193. return nativeObjectToString.call(value);
  7194. }
  7195. /**
  7196. * A specialized version of `baseRest` which transforms the rest array.
  7197. *
  7198. * @private
  7199. * @param {Function} func The function to apply a rest parameter to.
  7200. * @param {number} [start=func.length-1] The start position of the rest parameter.
  7201. * @param {Function} transform The rest array transform.
  7202. * @returns {Function} Returns the new function.
  7203. */
  7204. function overRest(func, start, transform) {
  7205. start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
  7206. return function() {
  7207. var args = arguments,
  7208. index = -1,
  7209. length = nativeMax(args.length - start, 0),
  7210. array = Array(length);
  7211. while (++index < length) {
  7212. array[index] = args[start + index];
  7213. }
  7214. index = -1;
  7215. var otherArgs = Array(start + 1);
  7216. while (++index < start) {
  7217. otherArgs[index] = args[index];
  7218. }
  7219. otherArgs[start] = transform(array);
  7220. return apply(func, this, otherArgs);
  7221. };
  7222. }
  7223. /**
  7224. * Gets the parent value at `path` of `object`.
  7225. *
  7226. * @private
  7227. * @param {Object} object The object to query.
  7228. * @param {Array} path The path to get the parent value of.
  7229. * @returns {*} Returns the parent value.
  7230. */
  7231. function parent(object, path) {
  7232. return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));
  7233. }
  7234. /**
  7235. * Reorder `array` according to the specified indexes where the element at
  7236. * the first index is assigned as the first element, the element at
  7237. * the second index is assigned as the second element, and so on.
  7238. *
  7239. * @private
  7240. * @param {Array} array The array to reorder.
  7241. * @param {Array} indexes The arranged array indexes.
  7242. * @returns {Array} Returns `array`.
  7243. */
  7244. function reorder(array, indexes) {
  7245. var arrLength = array.length,
  7246. length = nativeMin(indexes.length, arrLength),
  7247. oldArray = copyArray(array);
  7248. while (length--) {
  7249. var index = indexes[length];
  7250. array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
  7251. }
  7252. return array;
  7253. }
  7254. /**
  7255. * Gets the value at `key`, unless `key` is "__proto__" or "constructor".
  7256. *
  7257. * @private
  7258. * @param {Object} object The object to query.
  7259. * @param {string} key The key of the property to get.
  7260. * @returns {*} Returns the property value.
  7261. */
  7262. function safeGet(object, key) {
  7263. if (key === 'constructor' && typeof object[key] === 'function') {
  7264. return;
  7265. }
  7266. if (key == '__proto__') {
  7267. return;
  7268. }
  7269. return object[key];
  7270. }
  7271. /**
  7272. * Sets metadata for `func`.
  7273. *
  7274. * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
  7275. * period of time, it will trip its breaker and transition to an identity
  7276. * function to avoid garbage collection pauses in V8. See
  7277. * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
  7278. * for more details.
  7279. *
  7280. * @private
  7281. * @param {Function} func The function to associate metadata with.
  7282. * @param {*} data The metadata.
  7283. * @returns {Function} Returns `func`.
  7284. */
  7285. var setData = shortOut(baseSetData);
  7286. /**
  7287. * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
  7288. *
  7289. * @private
  7290. * @param {Function} func The function to delay.
  7291. * @param {number} wait The number of milliseconds to delay invocation.
  7292. * @returns {number|Object} Returns the timer id or timeout object.
  7293. */
  7294. var setTimeout = ctxSetTimeout || function(func, wait) {
  7295. return root.setTimeout(func, wait);
  7296. };
  7297. /**
  7298. * Sets the `toString` method of `func` to return `string`.
  7299. *
  7300. * @private
  7301. * @param {Function} func The function to modify.
  7302. * @param {Function} string The `toString` result.
  7303. * @returns {Function} Returns `func`.
  7304. */
  7305. var setToString = shortOut(baseSetToString);
  7306. /**
  7307. * Sets the `toString` method of `wrapper` to mimic the source of `reference`
  7308. * with wrapper details in a comment at the top of the source body.
  7309. *
  7310. * @private
  7311. * @param {Function} wrapper The function to modify.
  7312. * @param {Function} reference The reference function.
  7313. * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  7314. * @returns {Function} Returns `wrapper`.
  7315. */
  7316. function setWrapToString(wrapper, reference, bitmask) {
  7317. var source = (reference + '');
  7318. return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
  7319. }
  7320. /**
  7321. * Creates a function that'll short out and invoke `identity` instead
  7322. * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
  7323. * milliseconds.
  7324. *
  7325. * @private
  7326. * @param {Function} func The function to restrict.
  7327. * @returns {Function} Returns the new shortable function.
  7328. */
  7329. function shortOut(func) {
  7330. var count = 0,
  7331. lastCalled = 0;
  7332. return function() {
  7333. var stamp = nativeNow(),
  7334. remaining = HOT_SPAN - (stamp - lastCalled);
  7335. lastCalled = stamp;
  7336. if (remaining > 0) {
  7337. if (++count >= HOT_COUNT) {
  7338. return arguments[0];
  7339. }
  7340. } else {
  7341. count = 0;
  7342. }
  7343. return func.apply(undefined, arguments);
  7344. };
  7345. }
  7346. /**
  7347. * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
  7348. *
  7349. * @private
  7350. * @param {Array} array The array to shuffle.
  7351. * @param {number} [size=array.length] The size of `array`.
  7352. * @returns {Array} Returns `array`.
  7353. */
  7354. function shuffleSelf(array, size) {
  7355. var index = -1,
  7356. length = array.length,
  7357. lastIndex = length - 1;
  7358. size = size === undefined ? length : size;
  7359. while (++index < size) {
  7360. var rand = baseRandom(index, lastIndex),
  7361. value = array[rand];
  7362. array[rand] = array[index];
  7363. array[index] = value;
  7364. }
  7365. array.length = size;
  7366. return array;
  7367. }
  7368. /**
  7369. * Converts `string` to a property path array.
  7370. *
  7371. * @private
  7372. * @param {string} string The string to convert.
  7373. * @returns {Array} Returns the property path array.
  7374. */
  7375. var stringToPath = memoizeCapped(function(string) {
  7376. var result = [];
  7377. if (string.charCodeAt(0) === 46 /* . */) {
  7378. result.push('');
  7379. }
  7380. string.replace(rePropName, function(match, number, quote, subString) {
  7381. result.push(quote ? subString.replace(reEscapeChar, '$1') : (number || match));
  7382. });
  7383. return result;
  7384. });
  7385. /**
  7386. * Converts `value` to a string key if it's not a string or symbol.
  7387. *
  7388. * @private
  7389. * @param {*} value The value to inspect.
  7390. * @returns {string|symbol} Returns the key.
  7391. */
  7392. function toKey(value) {
  7393. if (typeof value == 'string' || isSymbol(value)) {
  7394. return value;
  7395. }
  7396. var result = (value + '');
  7397. return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
  7398. }
  7399. /**
  7400. * Converts `func` to its source code.
  7401. *
  7402. * @private
  7403. * @param {Function} func The function to convert.
  7404. * @returns {string} Returns the source code.
  7405. */
  7406. function toSource(func) {
  7407. if (func != null) {
  7408. try {
  7409. return funcToString.call(func);
  7410. } catch (e) {}
  7411. try {
  7412. return (func + '');
  7413. } catch (e) {}
  7414. }
  7415. return '';
  7416. }
  7417. /**
  7418. * Updates wrapper `details` based on `bitmask` flags.
  7419. *
  7420. * @private
  7421. * @returns {Array} details The details to modify.
  7422. * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
  7423. * @returns {Array} Returns `details`.
  7424. */
  7425. function updateWrapDetails(details, bitmask) {
  7426. arrayEach(wrapFlags, function(pair) {
  7427. var value = '_.' + pair[0];
  7428. if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
  7429. details.push(value);
  7430. }
  7431. });
  7432. return details.sort();
  7433. }
  7434. /**
  7435. * Creates a clone of `wrapper`.
  7436. *
  7437. * @private
  7438. * @param {Object} wrapper The wrapper to clone.
  7439. * @returns {Object} Returns the cloned wrapper.
  7440. */
  7441. function wrapperClone(wrapper) {
  7442. if (wrapper instanceof LazyWrapper) {
  7443. return wrapper.clone();
  7444. }
  7445. var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
  7446. result.__actions__ = copyArray(wrapper.__actions__);
  7447. result.__index__ = wrapper.__index__;
  7448. result.__values__ = wrapper.__values__;
  7449. return result;
  7450. }
  7451. /*------------------------------------------------------------------------*/
  7452. /**
  7453. * Creates an array of elements split into groups the length of `size`.
  7454. * If `array` can't be split evenly, the final chunk will be the remaining
  7455. * elements.
  7456. *
  7457. * @static
  7458. * @memberOf _
  7459. * @since 3.0.0
  7460. * @category Array
  7461. * @param {Array} array The array to process.
  7462. * @param {number} [size=1] The length of each chunk
  7463. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  7464. * @returns {Array} Returns the new array of chunks.
  7465. * @example
  7466. *
  7467. * _.chunk(['a', 'b', 'c', 'd'], 2);
  7468. * // => [['a', 'b'], ['c', 'd']]
  7469. *
  7470. * _.chunk(['a', 'b', 'c', 'd'], 3);
  7471. * // => [['a', 'b', 'c'], ['d']]
  7472. */
  7473. function chunk(array, size, guard) {
  7474. if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
  7475. size = 1;
  7476. } else {
  7477. size = nativeMax(toInteger(size), 0);
  7478. }
  7479. var length = array == null ? 0 : array.length;
  7480. if (!length || size < 1) {
  7481. return [];
  7482. }
  7483. var index = 0,
  7484. resIndex = 0,
  7485. result = Array(nativeCeil(length / size));
  7486. while (index < length) {
  7487. result[resIndex++] = baseSlice(array, index, (index += size));
  7488. }
  7489. return result;
  7490. }
  7491. /**
  7492. * Creates an array with all falsey values removed. The values `false`, `null`,
  7493. * `0`, `""`, `undefined`, and `NaN` are falsey.
  7494. *
  7495. * @static
  7496. * @memberOf _
  7497. * @since 0.1.0
  7498. * @category Array
  7499. * @param {Array} array The array to compact.
  7500. * @returns {Array} Returns the new array of filtered values.
  7501. * @example
  7502. *
  7503. * _.compact([0, 1, false, 2, '', 3]);
  7504. * // => [1, 2, 3]
  7505. */
  7506. function compact(array) {
  7507. var index = -1,
  7508. length = array == null ? 0 : array.length,
  7509. resIndex = 0,
  7510. result = [];
  7511. while (++index < length) {
  7512. var value = array[index];
  7513. if (value) {
  7514. result[resIndex++] = value;
  7515. }
  7516. }
  7517. return result;
  7518. }
  7519. /**
  7520. * Creates a new array concatenating `array` with any additional arrays
  7521. * and/or values.
  7522. *
  7523. * @static
  7524. * @memberOf _
  7525. * @since 4.0.0
  7526. * @category Array
  7527. * @param {Array} array The array to concatenate.
  7528. * @param {...*} [values] The values to concatenate.
  7529. * @returns {Array} Returns the new concatenated array.
  7530. * @example
  7531. *
  7532. * var array = [1];
  7533. * var other = _.concat(array, 2, [3], [[4]]);
  7534. *
  7535. * console.log(other);
  7536. * // => [1, 2, 3, [4]]
  7537. *
  7538. * console.log(array);
  7539. * // => [1]
  7540. */
  7541. function concat() {
  7542. var length = arguments.length;
  7543. if (!length) {
  7544. return [];
  7545. }
  7546. var args = Array(length - 1),
  7547. array = arguments[0],
  7548. index = length;
  7549. while (index--) {
  7550. args[index - 1] = arguments[index];
  7551. }
  7552. return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
  7553. }
  7554. /**
  7555. * Creates an array of `array` values not included in the other given arrays
  7556. * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  7557. * for equality comparisons. The order and references of result values are
  7558. * determined by the first array.
  7559. *
  7560. * **Note:** Unlike `_.pullAll`, this method returns a new array.
  7561. *
  7562. * @static
  7563. * @memberOf _
  7564. * @since 0.1.0
  7565. * @category Array
  7566. * @param {Array} array The array to inspect.
  7567. * @param {...Array} [values] The values to exclude.
  7568. * @returns {Array} Returns the new array of filtered values.
  7569. * @see _.without, _.xor
  7570. * @example
  7571. *
  7572. * _.difference([2, 1], [2, 3]);
  7573. * // => [1]
  7574. */
  7575. var difference = baseRest(function(array, values) {
  7576. return isArrayLikeObject(array)
  7577. ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
  7578. : [];
  7579. });
  7580. /**
  7581. * This method is like `_.difference` except that it accepts `iteratee` which
  7582. * is invoked for each element of `array` and `values` to generate the criterion
  7583. * by which they're compared. The order and references of result values are
  7584. * determined by the first array. The iteratee is invoked with one argument:
  7585. * (value).
  7586. *
  7587. * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
  7588. *
  7589. * @static
  7590. * @memberOf _
  7591. * @since 4.0.0
  7592. * @category Array
  7593. * @param {Array} array The array to inspect.
  7594. * @param {...Array} [values] The values to exclude.
  7595. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  7596. * @returns {Array} Returns the new array of filtered values.
  7597. * @example
  7598. *
  7599. * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
  7600. * // => [1.2]
  7601. *
  7602. * // The `_.property` iteratee shorthand.
  7603. * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
  7604. * // => [{ 'x': 2 }]
  7605. */
  7606. var differenceBy = baseRest(function(array, values) {
  7607. var iteratee = last(values);
  7608. if (isArrayLikeObject(iteratee)) {
  7609. iteratee = undefined;
  7610. }
  7611. return isArrayLikeObject(array)
  7612. ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
  7613. : [];
  7614. });
  7615. /**
  7616. * This method is like `_.difference` except that it accepts `comparator`
  7617. * which is invoked to compare elements of `array` to `values`. The order and
  7618. * references of result values are determined by the first array. The comparator
  7619. * is invoked with two arguments: (arrVal, othVal).
  7620. *
  7621. * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
  7622. *
  7623. * @static
  7624. * @memberOf _
  7625. * @since 4.0.0
  7626. * @category Array
  7627. * @param {Array} array The array to inspect.
  7628. * @param {...Array} [values] The values to exclude.
  7629. * @param {Function} [comparator] The comparator invoked per element.
  7630. * @returns {Array} Returns the new array of filtered values.
  7631. * @example
  7632. *
  7633. * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
  7634. *
  7635. * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
  7636. * // => [{ 'x': 2, 'y': 1 }]
  7637. */
  7638. var differenceWith = baseRest(function(array, values) {
  7639. var comparator = last(values);
  7640. if (isArrayLikeObject(comparator)) {
  7641. comparator = undefined;
  7642. }
  7643. return isArrayLikeObject(array)
  7644. ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
  7645. : [];
  7646. });
  7647. /**
  7648. * Creates a slice of `array` with `n` elements dropped from the beginning.
  7649. *
  7650. * @static
  7651. * @memberOf _
  7652. * @since 0.5.0
  7653. * @category Array
  7654. * @param {Array} array The array to query.
  7655. * @param {number} [n=1] The number of elements to drop.
  7656. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  7657. * @returns {Array} Returns the slice of `array`.
  7658. * @example
  7659. *
  7660. * _.drop([1, 2, 3]);
  7661. * // => [2, 3]
  7662. *
  7663. * _.drop([1, 2, 3], 2);
  7664. * // => [3]
  7665. *
  7666. * _.drop([1, 2, 3], 5);
  7667. * // => []
  7668. *
  7669. * _.drop([1, 2, 3], 0);
  7670. * // => [1, 2, 3]
  7671. */
  7672. function drop(array, n, guard) {
  7673. var length = array == null ? 0 : array.length;
  7674. if (!length) {
  7675. return [];
  7676. }
  7677. n = (guard || n === undefined) ? 1 : toInteger(n);
  7678. return baseSlice(array, n < 0 ? 0 : n, length);
  7679. }
  7680. /**
  7681. * Creates a slice of `array` with `n` elements dropped from the end.
  7682. *
  7683. * @static
  7684. * @memberOf _
  7685. * @since 3.0.0
  7686. * @category Array
  7687. * @param {Array} array The array to query.
  7688. * @param {number} [n=1] The number of elements to drop.
  7689. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  7690. * @returns {Array} Returns the slice of `array`.
  7691. * @example
  7692. *
  7693. * _.dropRight([1, 2, 3]);
  7694. * // => [1, 2]
  7695. *
  7696. * _.dropRight([1, 2, 3], 2);
  7697. * // => [1]
  7698. *
  7699. * _.dropRight([1, 2, 3], 5);
  7700. * // => []
  7701. *
  7702. * _.dropRight([1, 2, 3], 0);
  7703. * // => [1, 2, 3]
  7704. */
  7705. function dropRight(array, n, guard) {
  7706. var length = array == null ? 0 : array.length;
  7707. if (!length) {
  7708. return [];
  7709. }
  7710. n = (guard || n === undefined) ? 1 : toInteger(n);
  7711. n = length - n;
  7712. return baseSlice(array, 0, n < 0 ? 0 : n);
  7713. }
  7714. /**
  7715. * Creates a slice of `array` excluding elements dropped from the end.
  7716. * Elements are dropped until `predicate` returns falsey. The predicate is
  7717. * invoked with three arguments: (value, index, array).
  7718. *
  7719. * @static
  7720. * @memberOf _
  7721. * @since 3.0.0
  7722. * @category Array
  7723. * @param {Array} array The array to query.
  7724. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  7725. * @returns {Array} Returns the slice of `array`.
  7726. * @example
  7727. *
  7728. * var users = [
  7729. * { 'user': 'barney', 'active': true },
  7730. * { 'user': 'fred', 'active': false },
  7731. * { 'user': 'pebbles', 'active': false }
  7732. * ];
  7733. *
  7734. * _.dropRightWhile(users, function(o) { return !o.active; });
  7735. * // => objects for ['barney']
  7736. *
  7737. * // The `_.matches` iteratee shorthand.
  7738. * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
  7739. * // => objects for ['barney', 'fred']
  7740. *
  7741. * // The `_.matchesProperty` iteratee shorthand.
  7742. * _.dropRightWhile(users, ['active', false]);
  7743. * // => objects for ['barney']
  7744. *
  7745. * // The `_.property` iteratee shorthand.
  7746. * _.dropRightWhile(users, 'active');
  7747. * // => objects for ['barney', 'fred', 'pebbles']
  7748. */
  7749. function dropRightWhile(array, predicate) {
  7750. return (array && array.length)
  7751. ? baseWhile(array, getIteratee(predicate, 3), true, true)
  7752. : [];
  7753. }
  7754. /**
  7755. * Creates a slice of `array` excluding elements dropped from the beginning.
  7756. * Elements are dropped until `predicate` returns falsey. The predicate is
  7757. * invoked with three arguments: (value, index, array).
  7758. *
  7759. * @static
  7760. * @memberOf _
  7761. * @since 3.0.0
  7762. * @category Array
  7763. * @param {Array} array The array to query.
  7764. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  7765. * @returns {Array} Returns the slice of `array`.
  7766. * @example
  7767. *
  7768. * var users = [
  7769. * { 'user': 'barney', 'active': false },
  7770. * { 'user': 'fred', 'active': false },
  7771. * { 'user': 'pebbles', 'active': true }
  7772. * ];
  7773. *
  7774. * _.dropWhile(users, function(o) { return !o.active; });
  7775. * // => objects for ['pebbles']
  7776. *
  7777. * // The `_.matches` iteratee shorthand.
  7778. * _.dropWhile(users, { 'user': 'barney', 'active': false });
  7779. * // => objects for ['fred', 'pebbles']
  7780. *
  7781. * // The `_.matchesProperty` iteratee shorthand.
  7782. * _.dropWhile(users, ['active', false]);
  7783. * // => objects for ['pebbles']
  7784. *
  7785. * // The `_.property` iteratee shorthand.
  7786. * _.dropWhile(users, 'active');
  7787. * // => objects for ['barney', 'fred', 'pebbles']
  7788. */
  7789. function dropWhile(array, predicate) {
  7790. return (array && array.length)
  7791. ? baseWhile(array, getIteratee(predicate, 3), true)
  7792. : [];
  7793. }
  7794. /**
  7795. * Fills elements of `array` with `value` from `start` up to, but not
  7796. * including, `end`.
  7797. *
  7798. * **Note:** This method mutates `array`.
  7799. *
  7800. * @static
  7801. * @memberOf _
  7802. * @since 3.2.0
  7803. * @category Array
  7804. * @param {Array} array The array to fill.
  7805. * @param {*} value The value to fill `array` with.
  7806. * @param {number} [start=0] The start position.
  7807. * @param {number} [end=array.length] The end position.
  7808. * @returns {Array} Returns `array`.
  7809. * @example
  7810. *
  7811. * var array = [1, 2, 3];
  7812. *
  7813. * _.fill(array, 'a');
  7814. * console.log(array);
  7815. * // => ['a', 'a', 'a']
  7816. *
  7817. * _.fill(Array(3), 2);
  7818. * // => [2, 2, 2]
  7819. *
  7820. * _.fill([4, 6, 8, 10], '*', 1, 3);
  7821. * // => [4, '*', '*', 10]
  7822. */
  7823. function fill(array, value, start, end) {
  7824. var length = array == null ? 0 : array.length;
  7825. if (!length) {
  7826. return [];
  7827. }
  7828. if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
  7829. start = 0;
  7830. end = length;
  7831. }
  7832. return baseFill(array, value, start, end);
  7833. }
  7834. /**
  7835. * This method is like `_.find` except that it returns the index of the first
  7836. * element `predicate` returns truthy for instead of the element itself.
  7837. *
  7838. * @static
  7839. * @memberOf _
  7840. * @since 1.1.0
  7841. * @category Array
  7842. * @param {Array} array The array to inspect.
  7843. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  7844. * @param {number} [fromIndex=0] The index to search from.
  7845. * @returns {number} Returns the index of the found element, else `-1`.
  7846. * @example
  7847. *
  7848. * var users = [
  7849. * { 'user': 'barney', 'active': false },
  7850. * { 'user': 'fred', 'active': false },
  7851. * { 'user': 'pebbles', 'active': true }
  7852. * ];
  7853. *
  7854. * _.findIndex(users, function(o) { return o.user == 'barney'; });
  7855. * // => 0
  7856. *
  7857. * // The `_.matches` iteratee shorthand.
  7858. * _.findIndex(users, { 'user': 'fred', 'active': false });
  7859. * // => 1
  7860. *
  7861. * // The `_.matchesProperty` iteratee shorthand.
  7862. * _.findIndex(users, ['active', false]);
  7863. * // => 0
  7864. *
  7865. * // The `_.property` iteratee shorthand.
  7866. * _.findIndex(users, 'active');
  7867. * // => 2
  7868. */
  7869. function findIndex(array, predicate, fromIndex) {
  7870. var length = array == null ? 0 : array.length;
  7871. if (!length) {
  7872. return -1;
  7873. }
  7874. var index = fromIndex == null ? 0 : toInteger(fromIndex);
  7875. if (index < 0) {
  7876. index = nativeMax(length + index, 0);
  7877. }
  7878. return baseFindIndex(array, getIteratee(predicate, 3), index);
  7879. }
  7880. /**
  7881. * This method is like `_.findIndex` except that it iterates over elements
  7882. * of `collection` from right to left.
  7883. *
  7884. * @static
  7885. * @memberOf _
  7886. * @since 2.0.0
  7887. * @category Array
  7888. * @param {Array} array The array to inspect.
  7889. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  7890. * @param {number} [fromIndex=array.length-1] The index to search from.
  7891. * @returns {number} Returns the index of the found element, else `-1`.
  7892. * @example
  7893. *
  7894. * var users = [
  7895. * { 'user': 'barney', 'active': true },
  7896. * { 'user': 'fred', 'active': false },
  7897. * { 'user': 'pebbles', 'active': false }
  7898. * ];
  7899. *
  7900. * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
  7901. * // => 2
  7902. *
  7903. * // The `_.matches` iteratee shorthand.
  7904. * _.findLastIndex(users, { 'user': 'barney', 'active': true });
  7905. * // => 0
  7906. *
  7907. * // The `_.matchesProperty` iteratee shorthand.
  7908. * _.findLastIndex(users, ['active', false]);
  7909. * // => 2
  7910. *
  7911. * // The `_.property` iteratee shorthand.
  7912. * _.findLastIndex(users, 'active');
  7913. * // => 0
  7914. */
  7915. function findLastIndex(array, predicate, fromIndex) {
  7916. var length = array == null ? 0 : array.length;
  7917. if (!length) {
  7918. return -1;
  7919. }
  7920. var index = length - 1;
  7921. if (fromIndex !== undefined) {
  7922. index = toInteger(fromIndex);
  7923. index = fromIndex < 0
  7924. ? nativeMax(length + index, 0)
  7925. : nativeMin(index, length - 1);
  7926. }
  7927. return baseFindIndex(array, getIteratee(predicate, 3), index, true);
  7928. }
  7929. /**
  7930. * Flattens `array` a single level deep.
  7931. *
  7932. * @static
  7933. * @memberOf _
  7934. * @since 0.1.0
  7935. * @category Array
  7936. * @param {Array} array The array to flatten.
  7937. * @returns {Array} Returns the new flattened array.
  7938. * @example
  7939. *
  7940. * _.flatten([1, [2, [3, [4]], 5]]);
  7941. * // => [1, 2, [3, [4]], 5]
  7942. */
  7943. function flatten(array) {
  7944. var length = array == null ? 0 : array.length;
  7945. return length ? baseFlatten(array, 1) : [];
  7946. }
  7947. /**
  7948. * Recursively flattens `array`.
  7949. *
  7950. * @static
  7951. * @memberOf _
  7952. * @since 3.0.0
  7953. * @category Array
  7954. * @param {Array} array The array to flatten.
  7955. * @returns {Array} Returns the new flattened array.
  7956. * @example
  7957. *
  7958. * _.flattenDeep([1, [2, [3, [4]], 5]]);
  7959. * // => [1, 2, 3, 4, 5]
  7960. */
  7961. function flattenDeep(array) {
  7962. var length = array == null ? 0 : array.length;
  7963. return length ? baseFlatten(array, INFINITY) : [];
  7964. }
  7965. /**
  7966. * Recursively flatten `array` up to `depth` times.
  7967. *
  7968. * @static
  7969. * @memberOf _
  7970. * @since 4.4.0
  7971. * @category Array
  7972. * @param {Array} array The array to flatten.
  7973. * @param {number} [depth=1] The maximum recursion depth.
  7974. * @returns {Array} Returns the new flattened array.
  7975. * @example
  7976. *
  7977. * var array = [1, [2, [3, [4]], 5]];
  7978. *
  7979. * _.flattenDepth(array, 1);
  7980. * // => [1, 2, [3, [4]], 5]
  7981. *
  7982. * _.flattenDepth(array, 2);
  7983. * // => [1, 2, 3, [4], 5]
  7984. */
  7985. function flattenDepth(array, depth) {
  7986. var length = array == null ? 0 : array.length;
  7987. if (!length) {
  7988. return [];
  7989. }
  7990. depth = depth === undefined ? 1 : toInteger(depth);
  7991. return baseFlatten(array, depth);
  7992. }
  7993. /**
  7994. * The inverse of `_.toPairs`; this method returns an object composed
  7995. * from key-value `pairs`.
  7996. *
  7997. * @static
  7998. * @memberOf _
  7999. * @since 4.0.0
  8000. * @category Array
  8001. * @param {Array} pairs The key-value pairs.
  8002. * @returns {Object} Returns the new object.
  8003. * @example
  8004. *
  8005. * _.fromPairs([['a', 1], ['b', 2]]);
  8006. * // => { 'a': 1, 'b': 2 }
  8007. */
  8008. function fromPairs(pairs) {
  8009. var index = -1,
  8010. length = pairs == null ? 0 : pairs.length,
  8011. result = {};
  8012. while (++index < length) {
  8013. var pair = pairs[index];
  8014. result[pair[0]] = pair[1];
  8015. }
  8016. return result;
  8017. }
  8018. /**
  8019. * Gets the first element of `array`.
  8020. *
  8021. * @static
  8022. * @memberOf _
  8023. * @since 0.1.0
  8024. * @alias first
  8025. * @category Array
  8026. * @param {Array} array The array to query.
  8027. * @returns {*} Returns the first element of `array`.
  8028. * @example
  8029. *
  8030. * _.head([1, 2, 3]);
  8031. * // => 1
  8032. *
  8033. * _.head([]);
  8034. * // => undefined
  8035. */
  8036. function head(array) {
  8037. return (array && array.length) ? array[0] : undefined;
  8038. }
  8039. /**
  8040. * Gets the index at which the first occurrence of `value` is found in `array`
  8041. * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  8042. * for equality comparisons. If `fromIndex` is negative, it's used as the
  8043. * offset from the end of `array`.
  8044. *
  8045. * @static
  8046. * @memberOf _
  8047. * @since 0.1.0
  8048. * @category Array
  8049. * @param {Array} array The array to inspect.
  8050. * @param {*} value The value to search for.
  8051. * @param {number} [fromIndex=0] The index to search from.
  8052. * @returns {number} Returns the index of the matched value, else `-1`.
  8053. * @example
  8054. *
  8055. * _.indexOf([1, 2, 1, 2], 2);
  8056. * // => 1
  8057. *
  8058. * // Search from the `fromIndex`.
  8059. * _.indexOf([1, 2, 1, 2], 2, 2);
  8060. * // => 3
  8061. */
  8062. function indexOf(array, value, fromIndex) {
  8063. var length = array == null ? 0 : array.length;
  8064. if (!length) {
  8065. return -1;
  8066. }
  8067. var index = fromIndex == null ? 0 : toInteger(fromIndex);
  8068. if (index < 0) {
  8069. index = nativeMax(length + index, 0);
  8070. }
  8071. return baseIndexOf(array, value, index);
  8072. }
  8073. /**
  8074. * Gets all but the last element of `array`.
  8075. *
  8076. * @static
  8077. * @memberOf _
  8078. * @since 0.1.0
  8079. * @category Array
  8080. * @param {Array} array The array to query.
  8081. * @returns {Array} Returns the slice of `array`.
  8082. * @example
  8083. *
  8084. * _.initial([1, 2, 3]);
  8085. * // => [1, 2]
  8086. */
  8087. function initial(array) {
  8088. var length = array == null ? 0 : array.length;
  8089. return length ? baseSlice(array, 0, -1) : [];
  8090. }
  8091. /**
  8092. * Creates an array of unique values that are included in all given arrays
  8093. * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  8094. * for equality comparisons. The order and references of result values are
  8095. * determined by the first array.
  8096. *
  8097. * @static
  8098. * @memberOf _
  8099. * @since 0.1.0
  8100. * @category Array
  8101. * @param {...Array} [arrays] The arrays to inspect.
  8102. * @returns {Array} Returns the new array of intersecting values.
  8103. * @example
  8104. *
  8105. * _.intersection([2, 1], [2, 3]);
  8106. * // => [2]
  8107. */
  8108. var intersection = baseRest(function(arrays) {
  8109. var mapped = arrayMap(arrays, castArrayLikeObject);
  8110. return (mapped.length && mapped[0] === arrays[0])
  8111. ? baseIntersection(mapped)
  8112. : [];
  8113. });
  8114. /**
  8115. * This method is like `_.intersection` except that it accepts `iteratee`
  8116. * which is invoked for each element of each `arrays` to generate the criterion
  8117. * by which they're compared. The order and references of result values are
  8118. * determined by the first array. The iteratee is invoked with one argument:
  8119. * (value).
  8120. *
  8121. * @static
  8122. * @memberOf _
  8123. * @since 4.0.0
  8124. * @category Array
  8125. * @param {...Array} [arrays] The arrays to inspect.
  8126. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  8127. * @returns {Array} Returns the new array of intersecting values.
  8128. * @example
  8129. *
  8130. * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
  8131. * // => [2.1]
  8132. *
  8133. * // The `_.property` iteratee shorthand.
  8134. * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
  8135. * // => [{ 'x': 1 }]
  8136. */
  8137. var intersectionBy = baseRest(function(arrays) {
  8138. var iteratee = last(arrays),
  8139. mapped = arrayMap(arrays, castArrayLikeObject);
  8140. if (iteratee === last(mapped)) {
  8141. iteratee = undefined;
  8142. } else {
  8143. mapped.pop();
  8144. }
  8145. return (mapped.length && mapped[0] === arrays[0])
  8146. ? baseIntersection(mapped, getIteratee(iteratee, 2))
  8147. : [];
  8148. });
  8149. /**
  8150. * This method is like `_.intersection` except that it accepts `comparator`
  8151. * which is invoked to compare elements of `arrays`. The order and references
  8152. * of result values are determined by the first array. The comparator is
  8153. * invoked with two arguments: (arrVal, othVal).
  8154. *
  8155. * @static
  8156. * @memberOf _
  8157. * @since 4.0.0
  8158. * @category Array
  8159. * @param {...Array} [arrays] The arrays to inspect.
  8160. * @param {Function} [comparator] The comparator invoked per element.
  8161. * @returns {Array} Returns the new array of intersecting values.
  8162. * @example
  8163. *
  8164. * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
  8165. * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
  8166. *
  8167. * _.intersectionWith(objects, others, _.isEqual);
  8168. * // => [{ 'x': 1, 'y': 2 }]
  8169. */
  8170. var intersectionWith = baseRest(function(arrays) {
  8171. var comparator = last(arrays),
  8172. mapped = arrayMap(arrays, castArrayLikeObject);
  8173. comparator = typeof comparator == 'function' ? comparator : undefined;
  8174. if (comparator) {
  8175. mapped.pop();
  8176. }
  8177. return (mapped.length && mapped[0] === arrays[0])
  8178. ? baseIntersection(mapped, undefined, comparator)
  8179. : [];
  8180. });
  8181. /**
  8182. * Converts all elements in `array` into a string separated by `separator`.
  8183. *
  8184. * @static
  8185. * @memberOf _
  8186. * @since 4.0.0
  8187. * @category Array
  8188. * @param {Array} array The array to convert.
  8189. * @param {string} [separator=','] The element separator.
  8190. * @returns {string} Returns the joined string.
  8191. * @example
  8192. *
  8193. * _.join(['a', 'b', 'c'], '~');
  8194. * // => 'a~b~c'
  8195. */
  8196. function join(array, separator) {
  8197. return array == null ? '' : nativeJoin.call(array, separator);
  8198. }
  8199. /**
  8200. * Gets the last element of `array`.
  8201. *
  8202. * @static
  8203. * @memberOf _
  8204. * @since 0.1.0
  8205. * @category Array
  8206. * @param {Array} array The array to query.
  8207. * @returns {*} Returns the last element of `array`.
  8208. * @example
  8209. *
  8210. * _.last([1, 2, 3]);
  8211. * // => 3
  8212. */
  8213. function last(array) {
  8214. var length = array == null ? 0 : array.length;
  8215. return length ? array[length - 1] : undefined;
  8216. }
  8217. /**
  8218. * This method is like `_.indexOf` except that it iterates over elements of
  8219. * `array` from right to left.
  8220. *
  8221. * @static
  8222. * @memberOf _
  8223. * @since 0.1.0
  8224. * @category Array
  8225. * @param {Array} array The array to inspect.
  8226. * @param {*} value The value to search for.
  8227. * @param {number} [fromIndex=array.length-1] The index to search from.
  8228. * @returns {number} Returns the index of the matched value, else `-1`.
  8229. * @example
  8230. *
  8231. * _.lastIndexOf([1, 2, 1, 2], 2);
  8232. * // => 3
  8233. *
  8234. * // Search from the `fromIndex`.
  8235. * _.lastIndexOf([1, 2, 1, 2], 2, 2);
  8236. * // => 1
  8237. */
  8238. function lastIndexOf(array, value, fromIndex) {
  8239. var length = array == null ? 0 : array.length;
  8240. if (!length) {
  8241. return -1;
  8242. }
  8243. var index = length;
  8244. if (fromIndex !== undefined) {
  8245. index = toInteger(fromIndex);
  8246. index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
  8247. }
  8248. return value === value
  8249. ? strictLastIndexOf(array, value, index)
  8250. : baseFindIndex(array, baseIsNaN, index, true);
  8251. }
  8252. /**
  8253. * Gets the element at index `n` of `array`. If `n` is negative, the nth
  8254. * element from the end is returned.
  8255. *
  8256. * @static
  8257. * @memberOf _
  8258. * @since 4.11.0
  8259. * @category Array
  8260. * @param {Array} array The array to query.
  8261. * @param {number} [n=0] The index of the element to return.
  8262. * @returns {*} Returns the nth element of `array`.
  8263. * @example
  8264. *
  8265. * var array = ['a', 'b', 'c', 'd'];
  8266. *
  8267. * _.nth(array, 1);
  8268. * // => 'b'
  8269. *
  8270. * _.nth(array, -2);
  8271. * // => 'c';
  8272. */
  8273. function nth(array, n) {
  8274. return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;
  8275. }
  8276. /**
  8277. * Removes all given values from `array` using
  8278. * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  8279. * for equality comparisons.
  8280. *
  8281. * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
  8282. * to remove elements from an array by predicate.
  8283. *
  8284. * @static
  8285. * @memberOf _
  8286. * @since 2.0.0
  8287. * @category Array
  8288. * @param {Array} array The array to modify.
  8289. * @param {...*} [values] The values to remove.
  8290. * @returns {Array} Returns `array`.
  8291. * @example
  8292. *
  8293. * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
  8294. *
  8295. * _.pull(array, 'a', 'c');
  8296. * console.log(array);
  8297. * // => ['b', 'b']
  8298. */
  8299. var pull = baseRest(pullAll);
  8300. /**
  8301. * This method is like `_.pull` except that it accepts an array of values to remove.
  8302. *
  8303. * **Note:** Unlike `_.difference`, this method mutates `array`.
  8304. *
  8305. * @static
  8306. * @memberOf _
  8307. * @since 4.0.0
  8308. * @category Array
  8309. * @param {Array} array The array to modify.
  8310. * @param {Array} values The values to remove.
  8311. * @returns {Array} Returns `array`.
  8312. * @example
  8313. *
  8314. * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
  8315. *
  8316. * _.pullAll(array, ['a', 'c']);
  8317. * console.log(array);
  8318. * // => ['b', 'b']
  8319. */
  8320. function pullAll(array, values) {
  8321. return (array && array.length && values && values.length)
  8322. ? basePullAll(array, values)
  8323. : array;
  8324. }
  8325. /**
  8326. * This method is like `_.pullAll` except that it accepts `iteratee` which is
  8327. * invoked for each element of `array` and `values` to generate the criterion
  8328. * by which they're compared. The iteratee is invoked with one argument: (value).
  8329. *
  8330. * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
  8331. *
  8332. * @static
  8333. * @memberOf _
  8334. * @since 4.0.0
  8335. * @category Array
  8336. * @param {Array} array The array to modify.
  8337. * @param {Array} values The values to remove.
  8338. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  8339. * @returns {Array} Returns `array`.
  8340. * @example
  8341. *
  8342. * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
  8343. *
  8344. * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
  8345. * console.log(array);
  8346. * // => [{ 'x': 2 }]
  8347. */
  8348. function pullAllBy(array, values, iteratee) {
  8349. return (array && array.length && values && values.length)
  8350. ? basePullAll(array, values, getIteratee(iteratee, 2))
  8351. : array;
  8352. }
  8353. /**
  8354. * This method is like `_.pullAll` except that it accepts `comparator` which
  8355. * is invoked to compare elements of `array` to `values`. The comparator is
  8356. * invoked with two arguments: (arrVal, othVal).
  8357. *
  8358. * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
  8359. *
  8360. * @static
  8361. * @memberOf _
  8362. * @since 4.6.0
  8363. * @category Array
  8364. * @param {Array} array The array to modify.
  8365. * @param {Array} values The values to remove.
  8366. * @param {Function} [comparator] The comparator invoked per element.
  8367. * @returns {Array} Returns `array`.
  8368. * @example
  8369. *
  8370. * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
  8371. *
  8372. * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
  8373. * console.log(array);
  8374. * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
  8375. */
  8376. function pullAllWith(array, values, comparator) {
  8377. return (array && array.length && values && values.length)
  8378. ? basePullAll(array, values, undefined, comparator)
  8379. : array;
  8380. }
  8381. /**
  8382. * Removes elements from `array` corresponding to `indexes` and returns an
  8383. * array of removed elements.
  8384. *
  8385. * **Note:** Unlike `_.at`, this method mutates `array`.
  8386. *
  8387. * @static
  8388. * @memberOf _
  8389. * @since 3.0.0
  8390. * @category Array
  8391. * @param {Array} array The array to modify.
  8392. * @param {...(number|number[])} [indexes] The indexes of elements to remove.
  8393. * @returns {Array} Returns the new array of removed elements.
  8394. * @example
  8395. *
  8396. * var array = ['a', 'b', 'c', 'd'];
  8397. * var pulled = _.pullAt(array, [1, 3]);
  8398. *
  8399. * console.log(array);
  8400. * // => ['a', 'c']
  8401. *
  8402. * console.log(pulled);
  8403. * // => ['b', 'd']
  8404. */
  8405. var pullAt = flatRest(function(array, indexes) {
  8406. var length = array == null ? 0 : array.length,
  8407. result = baseAt(array, indexes);
  8408. basePullAt(array, arrayMap(indexes, function(index) {
  8409. return isIndex(index, length) ? +index : index;
  8410. }).sort(compareAscending));
  8411. return result;
  8412. });
  8413. /**
  8414. * Removes all elements from `array` that `predicate` returns truthy for
  8415. * and returns an array of the removed elements. The predicate is invoked
  8416. * with three arguments: (value, index, array).
  8417. *
  8418. * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
  8419. * to pull elements from an array by value.
  8420. *
  8421. * @static
  8422. * @memberOf _
  8423. * @since 2.0.0
  8424. * @category Array
  8425. * @param {Array} array The array to modify.
  8426. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  8427. * @returns {Array} Returns the new array of removed elements.
  8428. * @example
  8429. *
  8430. * var array = [1, 2, 3, 4];
  8431. * var evens = _.remove(array, function(n) {
  8432. * return n % 2 == 0;
  8433. * });
  8434. *
  8435. * console.log(array);
  8436. * // => [1, 3]
  8437. *
  8438. * console.log(evens);
  8439. * // => [2, 4]
  8440. */
  8441. function remove(array, predicate) {
  8442. var result = [];
  8443. if (!(array && array.length)) {
  8444. return result;
  8445. }
  8446. var index = -1,
  8447. indexes = [],
  8448. length = array.length;
  8449. predicate = getIteratee(predicate, 3);
  8450. while (++index < length) {
  8451. var value = array[index];
  8452. if (predicate(value, index, array)) {
  8453. result.push(value);
  8454. indexes.push(index);
  8455. }
  8456. }
  8457. basePullAt(array, indexes);
  8458. return result;
  8459. }
  8460. /**
  8461. * Reverses `array` so that the first element becomes the last, the second
  8462. * element becomes the second to last, and so on.
  8463. *
  8464. * **Note:** This method mutates `array` and is based on
  8465. * [`Array#reverse`](https://mdn.io/Array/reverse).
  8466. *
  8467. * @static
  8468. * @memberOf _
  8469. * @since 4.0.0
  8470. * @category Array
  8471. * @param {Array} array The array to modify.
  8472. * @returns {Array} Returns `array`.
  8473. * @example
  8474. *
  8475. * var array = [1, 2, 3];
  8476. *
  8477. * _.reverse(array);
  8478. * // => [3, 2, 1]
  8479. *
  8480. * console.log(array);
  8481. * // => [3, 2, 1]
  8482. */
  8483. function reverse(array) {
  8484. return array == null ? array : nativeReverse.call(array);
  8485. }
  8486. /**
  8487. * Creates a slice of `array` from `start` up to, but not including, `end`.
  8488. *
  8489. * **Note:** This method is used instead of
  8490. * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
  8491. * returned.
  8492. *
  8493. * @static
  8494. * @memberOf _
  8495. * @since 3.0.0
  8496. * @category Array
  8497. * @param {Array} array The array to slice.
  8498. * @param {number} [start=0] The start position.
  8499. * @param {number} [end=array.length] The end position.
  8500. * @returns {Array} Returns the slice of `array`.
  8501. */
  8502. function slice(array, start, end) {
  8503. var length = array == null ? 0 : array.length;
  8504. if (!length) {
  8505. return [];
  8506. }
  8507. if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
  8508. start = 0;
  8509. end = length;
  8510. }
  8511. else {
  8512. start = start == null ? 0 : toInteger(start);
  8513. end = end === undefined ? length : toInteger(end);
  8514. }
  8515. return baseSlice(array, start, end);
  8516. }
  8517. /**
  8518. * Uses a binary search to determine the lowest index at which `value`
  8519. * should be inserted into `array` in order to maintain its sort order.
  8520. *
  8521. * @static
  8522. * @memberOf _
  8523. * @since 0.1.0
  8524. * @category Array
  8525. * @param {Array} array The sorted array to inspect.
  8526. * @param {*} value The value to evaluate.
  8527. * @returns {number} Returns the index at which `value` should be inserted
  8528. * into `array`.
  8529. * @example
  8530. *
  8531. * _.sortedIndex([30, 50], 40);
  8532. * // => 1
  8533. */
  8534. function sortedIndex(array, value) {
  8535. return baseSortedIndex(array, value);
  8536. }
  8537. /**
  8538. * This method is like `_.sortedIndex` except that it accepts `iteratee`
  8539. * which is invoked for `value` and each element of `array` to compute their
  8540. * sort ranking. The iteratee is invoked with one argument: (value).
  8541. *
  8542. * @static
  8543. * @memberOf _
  8544. * @since 4.0.0
  8545. * @category Array
  8546. * @param {Array} array The sorted array to inspect.
  8547. * @param {*} value The value to evaluate.
  8548. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  8549. * @returns {number} Returns the index at which `value` should be inserted
  8550. * into `array`.
  8551. * @example
  8552. *
  8553. * var objects = [{ 'x': 4 }, { 'x': 5 }];
  8554. *
  8555. * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
  8556. * // => 0
  8557. *
  8558. * // The `_.property` iteratee shorthand.
  8559. * _.sortedIndexBy(objects, { 'x': 4 }, 'x');
  8560. * // => 0
  8561. */
  8562. function sortedIndexBy(array, value, iteratee) {
  8563. return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
  8564. }
  8565. /**
  8566. * This method is like `_.indexOf` except that it performs a binary
  8567. * search on a sorted `array`.
  8568. *
  8569. * @static
  8570. * @memberOf _
  8571. * @since 4.0.0
  8572. * @category Array
  8573. * @param {Array} array The array to inspect.
  8574. * @param {*} value The value to search for.
  8575. * @returns {number} Returns the index of the matched value, else `-1`.
  8576. * @example
  8577. *
  8578. * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
  8579. * // => 1
  8580. */
  8581. function sortedIndexOf(array, value) {
  8582. var length = array == null ? 0 : array.length;
  8583. if (length) {
  8584. var index = baseSortedIndex(array, value);
  8585. if (index < length && eq(array[index], value)) {
  8586. return index;
  8587. }
  8588. }
  8589. return -1;
  8590. }
  8591. /**
  8592. * This method is like `_.sortedIndex` except that it returns the highest
  8593. * index at which `value` should be inserted into `array` in order to
  8594. * maintain its sort order.
  8595. *
  8596. * @static
  8597. * @memberOf _
  8598. * @since 3.0.0
  8599. * @category Array
  8600. * @param {Array} array The sorted array to inspect.
  8601. * @param {*} value The value to evaluate.
  8602. * @returns {number} Returns the index at which `value` should be inserted
  8603. * into `array`.
  8604. * @example
  8605. *
  8606. * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
  8607. * // => 4
  8608. */
  8609. function sortedLastIndex(array, value) {
  8610. return baseSortedIndex(array, value, true);
  8611. }
  8612. /**
  8613. * This method is like `_.sortedLastIndex` except that it accepts `iteratee`
  8614. * which is invoked for `value` and each element of `array` to compute their
  8615. * sort ranking. The iteratee is invoked with one argument: (value).
  8616. *
  8617. * @static
  8618. * @memberOf _
  8619. * @since 4.0.0
  8620. * @category Array
  8621. * @param {Array} array The sorted array to inspect.
  8622. * @param {*} value The value to evaluate.
  8623. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  8624. * @returns {number} Returns the index at which `value` should be inserted
  8625. * into `array`.
  8626. * @example
  8627. *
  8628. * var objects = [{ 'x': 4 }, { 'x': 5 }];
  8629. *
  8630. * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
  8631. * // => 1
  8632. *
  8633. * // The `_.property` iteratee shorthand.
  8634. * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
  8635. * // => 1
  8636. */
  8637. function sortedLastIndexBy(array, value, iteratee) {
  8638. return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
  8639. }
  8640. /**
  8641. * This method is like `_.lastIndexOf` except that it performs a binary
  8642. * search on a sorted `array`.
  8643. *
  8644. * @static
  8645. * @memberOf _
  8646. * @since 4.0.0
  8647. * @category Array
  8648. * @param {Array} array The array to inspect.
  8649. * @param {*} value The value to search for.
  8650. * @returns {number} Returns the index of the matched value, else `-1`.
  8651. * @example
  8652. *
  8653. * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
  8654. * // => 3
  8655. */
  8656. function sortedLastIndexOf(array, value) {
  8657. var length = array == null ? 0 : array.length;
  8658. if (length) {
  8659. var index = baseSortedIndex(array, value, true) - 1;
  8660. if (eq(array[index], value)) {
  8661. return index;
  8662. }
  8663. }
  8664. return -1;
  8665. }
  8666. /**
  8667. * This method is like `_.uniq` except that it's designed and optimized
  8668. * for sorted arrays.
  8669. *
  8670. * @static
  8671. * @memberOf _
  8672. * @since 4.0.0
  8673. * @category Array
  8674. * @param {Array} array The array to inspect.
  8675. * @returns {Array} Returns the new duplicate free array.
  8676. * @example
  8677. *
  8678. * _.sortedUniq([1, 1, 2]);
  8679. * // => [1, 2]
  8680. */
  8681. function sortedUniq(array) {
  8682. return (array && array.length)
  8683. ? baseSortedUniq(array)
  8684. : [];
  8685. }
  8686. /**
  8687. * This method is like `_.uniqBy` except that it's designed and optimized
  8688. * for sorted arrays.
  8689. *
  8690. * @static
  8691. * @memberOf _
  8692. * @since 4.0.0
  8693. * @category Array
  8694. * @param {Array} array The array to inspect.
  8695. * @param {Function} [iteratee] The iteratee invoked per element.
  8696. * @returns {Array} Returns the new duplicate free array.
  8697. * @example
  8698. *
  8699. * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
  8700. * // => [1.1, 2.3]
  8701. */
  8702. function sortedUniqBy(array, iteratee) {
  8703. return (array && array.length)
  8704. ? baseSortedUniq(array, getIteratee(iteratee, 2))
  8705. : [];
  8706. }
  8707. /**
  8708. * Gets all but the first element of `array`.
  8709. *
  8710. * @static
  8711. * @memberOf _
  8712. * @since 4.0.0
  8713. * @category Array
  8714. * @param {Array} array The array to query.
  8715. * @returns {Array} Returns the slice of `array`.
  8716. * @example
  8717. *
  8718. * _.tail([1, 2, 3]);
  8719. * // => [2, 3]
  8720. */
  8721. function tail(array) {
  8722. var length = array == null ? 0 : array.length;
  8723. return length ? baseSlice(array, 1, length) : [];
  8724. }
  8725. /**
  8726. * Creates a slice of `array` with `n` elements taken from the beginning.
  8727. *
  8728. * @static
  8729. * @memberOf _
  8730. * @since 0.1.0
  8731. * @category Array
  8732. * @param {Array} array The array to query.
  8733. * @param {number} [n=1] The number of elements to take.
  8734. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  8735. * @returns {Array} Returns the slice of `array`.
  8736. * @example
  8737. *
  8738. * _.take([1, 2, 3]);
  8739. * // => [1]
  8740. *
  8741. * _.take([1, 2, 3], 2);
  8742. * // => [1, 2]
  8743. *
  8744. * _.take([1, 2, 3], 5);
  8745. * // => [1, 2, 3]
  8746. *
  8747. * _.take([1, 2, 3], 0);
  8748. * // => []
  8749. */
  8750. function take(array, n, guard) {
  8751. if (!(array && array.length)) {
  8752. return [];
  8753. }
  8754. n = (guard || n === undefined) ? 1 : toInteger(n);
  8755. return baseSlice(array, 0, n < 0 ? 0 : n);
  8756. }
  8757. /**
  8758. * Creates a slice of `array` with `n` elements taken from the end.
  8759. *
  8760. * @static
  8761. * @memberOf _
  8762. * @since 3.0.0
  8763. * @category Array
  8764. * @param {Array} array The array to query.
  8765. * @param {number} [n=1] The number of elements to take.
  8766. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  8767. * @returns {Array} Returns the slice of `array`.
  8768. * @example
  8769. *
  8770. * _.takeRight([1, 2, 3]);
  8771. * // => [3]
  8772. *
  8773. * _.takeRight([1, 2, 3], 2);
  8774. * // => [2, 3]
  8775. *
  8776. * _.takeRight([1, 2, 3], 5);
  8777. * // => [1, 2, 3]
  8778. *
  8779. * _.takeRight([1, 2, 3], 0);
  8780. * // => []
  8781. */
  8782. function takeRight(array, n, guard) {
  8783. var length = array == null ? 0 : array.length;
  8784. if (!length) {
  8785. return [];
  8786. }
  8787. n = (guard || n === undefined) ? 1 : toInteger(n);
  8788. n = length - n;
  8789. return baseSlice(array, n < 0 ? 0 : n, length);
  8790. }
  8791. /**
  8792. * Creates a slice of `array` with elements taken from the end. Elements are
  8793. * taken until `predicate` returns falsey. The predicate is invoked with
  8794. * three arguments: (value, index, array).
  8795. *
  8796. * @static
  8797. * @memberOf _
  8798. * @since 3.0.0
  8799. * @category Array
  8800. * @param {Array} array The array to query.
  8801. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  8802. * @returns {Array} Returns the slice of `array`.
  8803. * @example
  8804. *
  8805. * var users = [
  8806. * { 'user': 'barney', 'active': true },
  8807. * { 'user': 'fred', 'active': false },
  8808. * { 'user': 'pebbles', 'active': false }
  8809. * ];
  8810. *
  8811. * _.takeRightWhile(users, function(o) { return !o.active; });
  8812. * // => objects for ['fred', 'pebbles']
  8813. *
  8814. * // The `_.matches` iteratee shorthand.
  8815. * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
  8816. * // => objects for ['pebbles']
  8817. *
  8818. * // The `_.matchesProperty` iteratee shorthand.
  8819. * _.takeRightWhile(users, ['active', false]);
  8820. * // => objects for ['fred', 'pebbles']
  8821. *
  8822. * // The `_.property` iteratee shorthand.
  8823. * _.takeRightWhile(users, 'active');
  8824. * // => []
  8825. */
  8826. function takeRightWhile(array, predicate) {
  8827. return (array && array.length)
  8828. ? baseWhile(array, getIteratee(predicate, 3), false, true)
  8829. : [];
  8830. }
  8831. /**
  8832. * Creates a slice of `array` with elements taken from the beginning. Elements
  8833. * are taken until `predicate` returns falsey. The predicate is invoked with
  8834. * three arguments: (value, index, array).
  8835. *
  8836. * @static
  8837. * @memberOf _
  8838. * @since 3.0.0
  8839. * @category Array
  8840. * @param {Array} array The array to query.
  8841. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  8842. * @returns {Array} Returns the slice of `array`.
  8843. * @example
  8844. *
  8845. * var users = [
  8846. * { 'user': 'barney', 'active': false },
  8847. * { 'user': 'fred', 'active': false },
  8848. * { 'user': 'pebbles', 'active': true }
  8849. * ];
  8850. *
  8851. * _.takeWhile(users, function(o) { return !o.active; });
  8852. * // => objects for ['barney', 'fred']
  8853. *
  8854. * // The `_.matches` iteratee shorthand.
  8855. * _.takeWhile(users, { 'user': 'barney', 'active': false });
  8856. * // => objects for ['barney']
  8857. *
  8858. * // The `_.matchesProperty` iteratee shorthand.
  8859. * _.takeWhile(users, ['active', false]);
  8860. * // => objects for ['barney', 'fred']
  8861. *
  8862. * // The `_.property` iteratee shorthand.
  8863. * _.takeWhile(users, 'active');
  8864. * // => []
  8865. */
  8866. function takeWhile(array, predicate) {
  8867. return (array && array.length)
  8868. ? baseWhile(array, getIteratee(predicate, 3))
  8869. : [];
  8870. }
  8871. /**
  8872. * Creates an array of unique values, in order, from all given arrays using
  8873. * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  8874. * for equality comparisons.
  8875. *
  8876. * @static
  8877. * @memberOf _
  8878. * @since 0.1.0
  8879. * @category Array
  8880. * @param {...Array} [arrays] The arrays to inspect.
  8881. * @returns {Array} Returns the new array of combined values.
  8882. * @example
  8883. *
  8884. * _.union([2], [1, 2]);
  8885. * // => [2, 1]
  8886. */
  8887. var union = baseRest(function(arrays) {
  8888. return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
  8889. });
  8890. /**
  8891. * This method is like `_.union` except that it accepts `iteratee` which is
  8892. * invoked for each element of each `arrays` to generate the criterion by
  8893. * which uniqueness is computed. Result values are chosen from the first
  8894. * array in which the value occurs. The iteratee is invoked with one argument:
  8895. * (value).
  8896. *
  8897. * @static
  8898. * @memberOf _
  8899. * @since 4.0.0
  8900. * @category Array
  8901. * @param {...Array} [arrays] The arrays to inspect.
  8902. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  8903. * @returns {Array} Returns the new array of combined values.
  8904. * @example
  8905. *
  8906. * _.unionBy([2.1], [1.2, 2.3], Math.floor);
  8907. * // => [2.1, 1.2]
  8908. *
  8909. * // The `_.property` iteratee shorthand.
  8910. * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
  8911. * // => [{ 'x': 1 }, { 'x': 2 }]
  8912. */
  8913. var unionBy = baseRest(function(arrays) {
  8914. var iteratee = last(arrays);
  8915. if (isArrayLikeObject(iteratee)) {
  8916. iteratee = undefined;
  8917. }
  8918. return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
  8919. });
  8920. /**
  8921. * This method is like `_.union` except that it accepts `comparator` which
  8922. * is invoked to compare elements of `arrays`. Result values are chosen from
  8923. * the first array in which the value occurs. The comparator is invoked
  8924. * with two arguments: (arrVal, othVal).
  8925. *
  8926. * @static
  8927. * @memberOf _
  8928. * @since 4.0.0
  8929. * @category Array
  8930. * @param {...Array} [arrays] The arrays to inspect.
  8931. * @param {Function} [comparator] The comparator invoked per element.
  8932. * @returns {Array} Returns the new array of combined values.
  8933. * @example
  8934. *
  8935. * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
  8936. * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
  8937. *
  8938. * _.unionWith(objects, others, _.isEqual);
  8939. * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
  8940. */
  8941. var unionWith = baseRest(function(arrays) {
  8942. var comparator = last(arrays);
  8943. comparator = typeof comparator == 'function' ? comparator : undefined;
  8944. return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
  8945. });
  8946. /**
  8947. * Creates a duplicate-free version of an array, using
  8948. * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  8949. * for equality comparisons, in which only the first occurrence of each element
  8950. * is kept. The order of result values is determined by the order they occur
  8951. * in the array.
  8952. *
  8953. * @static
  8954. * @memberOf _
  8955. * @since 0.1.0
  8956. * @category Array
  8957. * @param {Array} array The array to inspect.
  8958. * @returns {Array} Returns the new duplicate free array.
  8959. * @example
  8960. *
  8961. * _.uniq([2, 1, 2]);
  8962. * // => [2, 1]
  8963. */
  8964. function uniq(array) {
  8965. return (array && array.length) ? baseUniq(array) : [];
  8966. }
  8967. /**
  8968. * This method is like `_.uniq` except that it accepts `iteratee` which is
  8969. * invoked for each element in `array` to generate the criterion by which
  8970. * uniqueness is computed. The order of result values is determined by the
  8971. * order they occur in the array. The iteratee is invoked with one argument:
  8972. * (value).
  8973. *
  8974. * @static
  8975. * @memberOf _
  8976. * @since 4.0.0
  8977. * @category Array
  8978. * @param {Array} array The array to inspect.
  8979. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  8980. * @returns {Array} Returns the new duplicate free array.
  8981. * @example
  8982. *
  8983. * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
  8984. * // => [2.1, 1.2]
  8985. *
  8986. * // The `_.property` iteratee shorthand.
  8987. * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
  8988. * // => [{ 'x': 1 }, { 'x': 2 }]
  8989. */
  8990. function uniqBy(array, iteratee) {
  8991. return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
  8992. }
  8993. /**
  8994. * This method is like `_.uniq` except that it accepts `comparator` which
  8995. * is invoked to compare elements of `array`. The order of result values is
  8996. * determined by the order they occur in the array.The comparator is invoked
  8997. * with two arguments: (arrVal, othVal).
  8998. *
  8999. * @static
  9000. * @memberOf _
  9001. * @since 4.0.0
  9002. * @category Array
  9003. * @param {Array} array The array to inspect.
  9004. * @param {Function} [comparator] The comparator invoked per element.
  9005. * @returns {Array} Returns the new duplicate free array.
  9006. * @example
  9007. *
  9008. * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
  9009. *
  9010. * _.uniqWith(objects, _.isEqual);
  9011. * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
  9012. */
  9013. function uniqWith(array, comparator) {
  9014. comparator = typeof comparator == 'function' ? comparator : undefined;
  9015. return (array && array.length) ? baseUniq(array, undefined, comparator) : [];
  9016. }
  9017. /**
  9018. * This method is like `_.zip` except that it accepts an array of grouped
  9019. * elements and creates an array regrouping the elements to their pre-zip
  9020. * configuration.
  9021. *
  9022. * @static
  9023. * @memberOf _
  9024. * @since 1.2.0
  9025. * @category Array
  9026. * @param {Array} array The array of grouped elements to process.
  9027. * @returns {Array} Returns the new array of regrouped elements.
  9028. * @example
  9029. *
  9030. * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
  9031. * // => [['a', 1, true], ['b', 2, false]]
  9032. *
  9033. * _.unzip(zipped);
  9034. * // => [['a', 'b'], [1, 2], [true, false]]
  9035. */
  9036. function unzip(array) {
  9037. if (!(array && array.length)) {
  9038. return [];
  9039. }
  9040. var length = 0;
  9041. array = arrayFilter(array, function(group) {
  9042. if (isArrayLikeObject(group)) {
  9043. length = nativeMax(group.length, length);
  9044. return true;
  9045. }
  9046. });
  9047. return baseTimes(length, function(index) {
  9048. return arrayMap(array, baseProperty(index));
  9049. });
  9050. }
  9051. /**
  9052. * This method is like `_.unzip` except that it accepts `iteratee` to specify
  9053. * how regrouped values should be combined. The iteratee is invoked with the
  9054. * elements of each group: (...group).
  9055. *
  9056. * @static
  9057. * @memberOf _
  9058. * @since 3.8.0
  9059. * @category Array
  9060. * @param {Array} array The array of grouped elements to process.
  9061. * @param {Function} [iteratee=_.identity] The function to combine
  9062. * regrouped values.
  9063. * @returns {Array} Returns the new array of regrouped elements.
  9064. * @example
  9065. *
  9066. * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
  9067. * // => [[1, 10, 100], [2, 20, 200]]
  9068. *
  9069. * _.unzipWith(zipped, _.add);
  9070. * // => [3, 30, 300]
  9071. */
  9072. function unzipWith(array, iteratee) {
  9073. if (!(array && array.length)) {
  9074. return [];
  9075. }
  9076. var result = unzip(array);
  9077. if (iteratee == null) {
  9078. return result;
  9079. }
  9080. return arrayMap(result, function(group) {
  9081. return apply(iteratee, undefined, group);
  9082. });
  9083. }
  9084. /**
  9085. * Creates an array excluding all given values using
  9086. * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  9087. * for equality comparisons.
  9088. *
  9089. * **Note:** Unlike `_.pull`, this method returns a new array.
  9090. *
  9091. * @static
  9092. * @memberOf _
  9093. * @since 0.1.0
  9094. * @category Array
  9095. * @param {Array} array The array to inspect.
  9096. * @param {...*} [values] The values to exclude.
  9097. * @returns {Array} Returns the new array of filtered values.
  9098. * @see _.difference, _.xor
  9099. * @example
  9100. *
  9101. * _.without([2, 1, 2, 3], 1, 2);
  9102. * // => [3]
  9103. */
  9104. var without = baseRest(function(array, values) {
  9105. return isArrayLikeObject(array)
  9106. ? baseDifference(array, values)
  9107. : [];
  9108. });
  9109. /**
  9110. * Creates an array of unique values that is the
  9111. * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
  9112. * of the given arrays. The order of result values is determined by the order
  9113. * they occur in the arrays.
  9114. *
  9115. * @static
  9116. * @memberOf _
  9117. * @since 2.4.0
  9118. * @category Array
  9119. * @param {...Array} [arrays] The arrays to inspect.
  9120. * @returns {Array} Returns the new array of filtered values.
  9121. * @see _.difference, _.without
  9122. * @example
  9123. *
  9124. * _.xor([2, 1], [2, 3]);
  9125. * // => [1, 3]
  9126. */
  9127. var xor = baseRest(function(arrays) {
  9128. return baseXor(arrayFilter(arrays, isArrayLikeObject));
  9129. });
  9130. /**
  9131. * This method is like `_.xor` except that it accepts `iteratee` which is
  9132. * invoked for each element of each `arrays` to generate the criterion by
  9133. * which by which they're compared. The order of result values is determined
  9134. * by the order they occur in the arrays. The iteratee is invoked with one
  9135. * argument: (value).
  9136. *
  9137. * @static
  9138. * @memberOf _
  9139. * @since 4.0.0
  9140. * @category Array
  9141. * @param {...Array} [arrays] The arrays to inspect.
  9142. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  9143. * @returns {Array} Returns the new array of filtered values.
  9144. * @example
  9145. *
  9146. * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
  9147. * // => [1.2, 3.4]
  9148. *
  9149. * // The `_.property` iteratee shorthand.
  9150. * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
  9151. * // => [{ 'x': 2 }]
  9152. */
  9153. var xorBy = baseRest(function(arrays) {
  9154. var iteratee = last(arrays);
  9155. if (isArrayLikeObject(iteratee)) {
  9156. iteratee = undefined;
  9157. }
  9158. return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
  9159. });
  9160. /**
  9161. * This method is like `_.xor` except that it accepts `comparator` which is
  9162. * invoked to compare elements of `arrays`. The order of result values is
  9163. * determined by the order they occur in the arrays. The comparator is invoked
  9164. * with two arguments: (arrVal, othVal).
  9165. *
  9166. * @static
  9167. * @memberOf _
  9168. * @since 4.0.0
  9169. * @category Array
  9170. * @param {...Array} [arrays] The arrays to inspect.
  9171. * @param {Function} [comparator] The comparator invoked per element.
  9172. * @returns {Array} Returns the new array of filtered values.
  9173. * @example
  9174. *
  9175. * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
  9176. * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
  9177. *
  9178. * _.xorWith(objects, others, _.isEqual);
  9179. * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
  9180. */
  9181. var xorWith = baseRest(function(arrays) {
  9182. var comparator = last(arrays);
  9183. comparator = typeof comparator == 'function' ? comparator : undefined;
  9184. return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
  9185. });
  9186. /**
  9187. * Creates an array of grouped elements, the first of which contains the
  9188. * first elements of the given arrays, the second of which contains the
  9189. * second elements of the given arrays, and so on.
  9190. *
  9191. * @static
  9192. * @memberOf _
  9193. * @since 0.1.0
  9194. * @category Array
  9195. * @param {...Array} [arrays] The arrays to process.
  9196. * @returns {Array} Returns the new array of grouped elements.
  9197. * @example
  9198. *
  9199. * _.zip(['a', 'b'], [1, 2], [true, false]);
  9200. * // => [['a', 1, true], ['b', 2, false]]
  9201. */
  9202. var zip = baseRest(unzip);
  9203. /**
  9204. * This method is like `_.fromPairs` except that it accepts two arrays,
  9205. * one of property identifiers and one of corresponding values.
  9206. *
  9207. * @static
  9208. * @memberOf _
  9209. * @since 0.4.0
  9210. * @category Array
  9211. * @param {Array} [props=[]] The property identifiers.
  9212. * @param {Array} [values=[]] The property values.
  9213. * @returns {Object} Returns the new object.
  9214. * @example
  9215. *
  9216. * _.zipObject(['a', 'b'], [1, 2]);
  9217. * // => { 'a': 1, 'b': 2 }
  9218. */
  9219. function zipObject(props, values) {
  9220. return baseZipObject(props || [], values || [], assignValue);
  9221. }
  9222. /**
  9223. * This method is like `_.zipObject` except that it supports property paths.
  9224. *
  9225. * @static
  9226. * @memberOf _
  9227. * @since 4.1.0
  9228. * @category Array
  9229. * @param {Array} [props=[]] The property identifiers.
  9230. * @param {Array} [values=[]] The property values.
  9231. * @returns {Object} Returns the new object.
  9232. * @example
  9233. *
  9234. * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
  9235. * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
  9236. */
  9237. function zipObjectDeep(props, values) {
  9238. return baseZipObject(props || [], values || [], baseSet);
  9239. }
  9240. /**
  9241. * This method is like `_.zip` except that it accepts `iteratee` to specify
  9242. * how grouped values should be combined. The iteratee is invoked with the
  9243. * elements of each group: (...group).
  9244. *
  9245. * @static
  9246. * @memberOf _
  9247. * @since 3.8.0
  9248. * @category Array
  9249. * @param {...Array} [arrays] The arrays to process.
  9250. * @param {Function} [iteratee=_.identity] The function to combine
  9251. * grouped values.
  9252. * @returns {Array} Returns the new array of grouped elements.
  9253. * @example
  9254. *
  9255. * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
  9256. * return a + b + c;
  9257. * });
  9258. * // => [111, 222]
  9259. */
  9260. var zipWith = baseRest(function(arrays) {
  9261. var length = arrays.length,
  9262. iteratee = length > 1 ? arrays[length - 1] : undefined;
  9263. iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;
  9264. return unzipWith(arrays, iteratee);
  9265. });
  9266. /*------------------------------------------------------------------------*/
  9267. /**
  9268. * Creates a `lodash` wrapper instance that wraps `value` with explicit method
  9269. * chain sequences enabled. The result of such sequences must be unwrapped
  9270. * with `_#value`.
  9271. *
  9272. * @static
  9273. * @memberOf _
  9274. * @since 1.3.0
  9275. * @category Seq
  9276. * @param {*} value The value to wrap.
  9277. * @returns {Object} Returns the new `lodash` wrapper instance.
  9278. * @example
  9279. *
  9280. * var users = [
  9281. * { 'user': 'barney', 'age': 36 },
  9282. * { 'user': 'fred', 'age': 40 },
  9283. * { 'user': 'pebbles', 'age': 1 }
  9284. * ];
  9285. *
  9286. * var youngest = _
  9287. * .chain(users)
  9288. * .sortBy('age')
  9289. * .map(function(o) {
  9290. * return o.user + ' is ' + o.age;
  9291. * })
  9292. * .head()
  9293. * .value();
  9294. * // => 'pebbles is 1'
  9295. */
  9296. function chain(value) {
  9297. var result = lodash(value);
  9298. result.__chain__ = true;
  9299. return result;
  9300. }
  9301. /**
  9302. * This method invokes `interceptor` and returns `value`. The interceptor
  9303. * is invoked with one argument; (value). The purpose of this method is to
  9304. * "tap into" a method chain sequence in order to modify intermediate results.
  9305. *
  9306. * @static
  9307. * @memberOf _
  9308. * @since 0.1.0
  9309. * @category Seq
  9310. * @param {*} value The value to provide to `interceptor`.
  9311. * @param {Function} interceptor The function to invoke.
  9312. * @returns {*} Returns `value`.
  9313. * @example
  9314. *
  9315. * _([1, 2, 3])
  9316. * .tap(function(array) {
  9317. * // Mutate input array.
  9318. * array.pop();
  9319. * })
  9320. * .reverse()
  9321. * .value();
  9322. * // => [2, 1]
  9323. */
  9324. function tap(value, interceptor) {
  9325. interceptor(value);
  9326. return value;
  9327. }
  9328. /**
  9329. * This method is like `_.tap` except that it returns the result of `interceptor`.
  9330. * The purpose of this method is to "pass thru" values replacing intermediate
  9331. * results in a method chain sequence.
  9332. *
  9333. * @static
  9334. * @memberOf _
  9335. * @since 3.0.0
  9336. * @category Seq
  9337. * @param {*} value The value to provide to `interceptor`.
  9338. * @param {Function} interceptor The function to invoke.
  9339. * @returns {*} Returns the result of `interceptor`.
  9340. * @example
  9341. *
  9342. * _(' abc ')
  9343. * .chain()
  9344. * .trim()
  9345. * .thru(function(value) {
  9346. * return [value];
  9347. * })
  9348. * .value();
  9349. * // => ['abc']
  9350. */
  9351. function thru(value, interceptor) {
  9352. return interceptor(value);
  9353. }
  9354. /**
  9355. * This method is the wrapper version of `_.at`.
  9356. *
  9357. * @name at
  9358. * @memberOf _
  9359. * @since 1.0.0
  9360. * @category Seq
  9361. * @param {...(string|string[])} [paths] The property paths to pick.
  9362. * @returns {Object} Returns the new `lodash` wrapper instance.
  9363. * @example
  9364. *
  9365. * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
  9366. *
  9367. * _(object).at(['a[0].b.c', 'a[1]']).value();
  9368. * // => [3, 4]
  9369. */
  9370. var wrapperAt = flatRest(function(paths) {
  9371. var length = paths.length,
  9372. start = length ? paths[0] : 0,
  9373. value = this.__wrapped__,
  9374. interceptor = function(object) { return baseAt(object, paths); };
  9375. if (length > 1 || this.__actions__.length ||
  9376. !(value instanceof LazyWrapper) || !isIndex(start)) {
  9377. return this.thru(interceptor);
  9378. }
  9379. value = value.slice(start, +start + (length ? 1 : 0));
  9380. value.__actions__.push({
  9381. 'func': thru,
  9382. 'args': [interceptor],
  9383. 'thisArg': undefined
  9384. });
  9385. return new LodashWrapper(value, this.__chain__).thru(function(array) {
  9386. if (length && !array.length) {
  9387. array.push(undefined);
  9388. }
  9389. return array;
  9390. });
  9391. });
  9392. /**
  9393. * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
  9394. *
  9395. * @name chain
  9396. * @memberOf _
  9397. * @since 0.1.0
  9398. * @category Seq
  9399. * @returns {Object} Returns the new `lodash` wrapper instance.
  9400. * @example
  9401. *
  9402. * var users = [
  9403. * { 'user': 'barney', 'age': 36 },
  9404. * { 'user': 'fred', 'age': 40 }
  9405. * ];
  9406. *
  9407. * // A sequence without explicit chaining.
  9408. * _(users).head();
  9409. * // => { 'user': 'barney', 'age': 36 }
  9410. *
  9411. * // A sequence with explicit chaining.
  9412. * _(users)
  9413. * .chain()
  9414. * .head()
  9415. * .pick('user')
  9416. * .value();
  9417. * // => { 'user': 'barney' }
  9418. */
  9419. function wrapperChain() {
  9420. return chain(this);
  9421. }
  9422. /**
  9423. * Executes the chain sequence and returns the wrapped result.
  9424. *
  9425. * @name commit
  9426. * @memberOf _
  9427. * @since 3.2.0
  9428. * @category Seq
  9429. * @returns {Object} Returns the new `lodash` wrapper instance.
  9430. * @example
  9431. *
  9432. * var array = [1, 2];
  9433. * var wrapped = _(array).push(3);
  9434. *
  9435. * console.log(array);
  9436. * // => [1, 2]
  9437. *
  9438. * wrapped = wrapped.commit();
  9439. * console.log(array);
  9440. * // => [1, 2, 3]
  9441. *
  9442. * wrapped.last();
  9443. * // => 3
  9444. *
  9445. * console.log(array);
  9446. * // => [1, 2, 3]
  9447. */
  9448. function wrapperCommit() {
  9449. return new LodashWrapper(this.value(), this.__chain__);
  9450. }
  9451. /**
  9452. * Gets the next value on a wrapped object following the
  9453. * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
  9454. *
  9455. * @name next
  9456. * @memberOf _
  9457. * @since 4.0.0
  9458. * @category Seq
  9459. * @returns {Object} Returns the next iterator value.
  9460. * @example
  9461. *
  9462. * var wrapped = _([1, 2]);
  9463. *
  9464. * wrapped.next();
  9465. * // => { 'done': false, 'value': 1 }
  9466. *
  9467. * wrapped.next();
  9468. * // => { 'done': false, 'value': 2 }
  9469. *
  9470. * wrapped.next();
  9471. * // => { 'done': true, 'value': undefined }
  9472. */
  9473. function wrapperNext() {
  9474. if (this.__values__ === undefined) {
  9475. this.__values__ = toArray(this.value());
  9476. }
  9477. var done = this.__index__ >= this.__values__.length,
  9478. value = done ? undefined : this.__values__[this.__index__++];
  9479. return { 'done': done, 'value': value };
  9480. }
  9481. /**
  9482. * Enables the wrapper to be iterable.
  9483. *
  9484. * @name Symbol.iterator
  9485. * @memberOf _
  9486. * @since 4.0.0
  9487. * @category Seq
  9488. * @returns {Object} Returns the wrapper object.
  9489. * @example
  9490. *
  9491. * var wrapped = _([1, 2]);
  9492. *
  9493. * wrapped[Symbol.iterator]() === wrapped;
  9494. * // => true
  9495. *
  9496. * Array.from(wrapped);
  9497. * // => [1, 2]
  9498. */
  9499. function wrapperToIterator() {
  9500. return this;
  9501. }
  9502. /**
  9503. * Creates a clone of the chain sequence planting `value` as the wrapped value.
  9504. *
  9505. * @name plant
  9506. * @memberOf _
  9507. * @since 3.2.0
  9508. * @category Seq
  9509. * @param {*} value The value to plant.
  9510. * @returns {Object} Returns the new `lodash` wrapper instance.
  9511. * @example
  9512. *
  9513. * function square(n) {
  9514. * return n * n;
  9515. * }
  9516. *
  9517. * var wrapped = _([1, 2]).map(square);
  9518. * var other = wrapped.plant([3, 4]);
  9519. *
  9520. * other.value();
  9521. * // => [9, 16]
  9522. *
  9523. * wrapped.value();
  9524. * // => [1, 4]
  9525. */
  9526. function wrapperPlant(value) {
  9527. var result,
  9528. parent = this;
  9529. while (parent instanceof baseLodash) {
  9530. var clone = wrapperClone(parent);
  9531. clone.__index__ = 0;
  9532. clone.__values__ = undefined;
  9533. if (result) {
  9534. previous.__wrapped__ = clone;
  9535. } else {
  9536. result = clone;
  9537. }
  9538. var previous = clone;
  9539. parent = parent.__wrapped__;
  9540. }
  9541. previous.__wrapped__ = value;
  9542. return result;
  9543. }
  9544. /**
  9545. * This method is the wrapper version of `_.reverse`.
  9546. *
  9547. * **Note:** This method mutates the wrapped array.
  9548. *
  9549. * @name reverse
  9550. * @memberOf _
  9551. * @since 0.1.0
  9552. * @category Seq
  9553. * @returns {Object} Returns the new `lodash` wrapper instance.
  9554. * @example
  9555. *
  9556. * var array = [1, 2, 3];
  9557. *
  9558. * _(array).reverse().value()
  9559. * // => [3, 2, 1]
  9560. *
  9561. * console.log(array);
  9562. * // => [3, 2, 1]
  9563. */
  9564. function wrapperReverse() {
  9565. var value = this.__wrapped__;
  9566. if (value instanceof LazyWrapper) {
  9567. var wrapped = value;
  9568. if (this.__actions__.length) {
  9569. wrapped = new LazyWrapper(this);
  9570. }
  9571. wrapped = wrapped.reverse();
  9572. wrapped.__actions__.push({
  9573. 'func': thru,
  9574. 'args': [reverse],
  9575. 'thisArg': undefined
  9576. });
  9577. return new LodashWrapper(wrapped, this.__chain__);
  9578. }
  9579. return this.thru(reverse);
  9580. }
  9581. /**
  9582. * Executes the chain sequence to resolve the unwrapped value.
  9583. *
  9584. * @name value
  9585. * @memberOf _
  9586. * @since 0.1.0
  9587. * @alias toJSON, valueOf
  9588. * @category Seq
  9589. * @returns {*} Returns the resolved unwrapped value.
  9590. * @example
  9591. *
  9592. * _([1, 2, 3]).value();
  9593. * // => [1, 2, 3]
  9594. */
  9595. function wrapperValue() {
  9596. return baseWrapperValue(this.__wrapped__, this.__actions__);
  9597. }
  9598. /*------------------------------------------------------------------------*/
  9599. /**
  9600. * Creates an object composed of keys generated from the results of running
  9601. * each element of `collection` thru `iteratee`. The corresponding value of
  9602. * each key is the number of times the key was returned by `iteratee`. The
  9603. * iteratee is invoked with one argument: (value).
  9604. *
  9605. * @static
  9606. * @memberOf _
  9607. * @since 0.5.0
  9608. * @category Collection
  9609. * @param {Array|Object} collection The collection to iterate over.
  9610. * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
  9611. * @returns {Object} Returns the composed aggregate object.
  9612. * @example
  9613. *
  9614. * _.countBy([6.1, 4.2, 6.3], Math.floor);
  9615. * // => { '4': 1, '6': 2 }
  9616. *
  9617. * // The `_.property` iteratee shorthand.
  9618. * _.countBy(['one', 'two', 'three'], 'length');
  9619. * // => { '3': 2, '5': 1 }
  9620. */
  9621. var countBy = createAggregator(function(result, value, key) {
  9622. if (hasOwnProperty.call(result, key)) {
  9623. ++result[key];
  9624. } else {
  9625. baseAssignValue(result, key, 1);
  9626. }
  9627. });
  9628. /**
  9629. * Checks if `predicate` returns truthy for **all** elements of `collection`.
  9630. * Iteration is stopped once `predicate` returns falsey. The predicate is
  9631. * invoked with three arguments: (value, index|key, collection).
  9632. *
  9633. * **Note:** This method returns `true` for
  9634. * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
  9635. * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
  9636. * elements of empty collections.
  9637. *
  9638. * @static
  9639. * @memberOf _
  9640. * @since 0.1.0
  9641. * @category Collection
  9642. * @param {Array|Object} collection The collection to iterate over.
  9643. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  9644. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  9645. * @returns {boolean} Returns `true` if all elements pass the predicate check,
  9646. * else `false`.
  9647. * @example
  9648. *
  9649. * _.every([true, 1, null, 'yes'], Boolean);
  9650. * // => false
  9651. *
  9652. * var users = [
  9653. * { 'user': 'barney', 'age': 36, 'active': false },
  9654. * { 'user': 'fred', 'age': 40, 'active': false }
  9655. * ];
  9656. *
  9657. * // The `_.matches` iteratee shorthand.
  9658. * _.every(users, { 'user': 'barney', 'active': false });
  9659. * // => false
  9660. *
  9661. * // The `_.matchesProperty` iteratee shorthand.
  9662. * _.every(users, ['active', false]);
  9663. * // => true
  9664. *
  9665. * // The `_.property` iteratee shorthand.
  9666. * _.every(users, 'active');
  9667. * // => false
  9668. */
  9669. function every(collection, predicate, guard) {
  9670. var func = isArray(collection) ? arrayEvery : baseEvery;
  9671. if (guard && isIterateeCall(collection, predicate, guard)) {
  9672. predicate = undefined;
  9673. }
  9674. return func(collection, getIteratee(predicate, 3));
  9675. }
  9676. /**
  9677. * Iterates over elements of `collection`, returning an array of all elements
  9678. * `predicate` returns truthy for. The predicate is invoked with three
  9679. * arguments: (value, index|key, collection).
  9680. *
  9681. * **Note:** Unlike `_.remove`, this method returns a new array.
  9682. *
  9683. * @static
  9684. * @memberOf _
  9685. * @since 0.1.0
  9686. * @category Collection
  9687. * @param {Array|Object} collection The collection to iterate over.
  9688. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  9689. * @returns {Array} Returns the new filtered array.
  9690. * @see _.reject
  9691. * @example
  9692. *
  9693. * var users = [
  9694. * { 'user': 'barney', 'age': 36, 'active': true },
  9695. * { 'user': 'fred', 'age': 40, 'active': false }
  9696. * ];
  9697. *
  9698. * _.filter(users, function(o) { return !o.active; });
  9699. * // => objects for ['fred']
  9700. *
  9701. * // The `_.matches` iteratee shorthand.
  9702. * _.filter(users, { 'age': 36, 'active': true });
  9703. * // => objects for ['barney']
  9704. *
  9705. * // The `_.matchesProperty` iteratee shorthand.
  9706. * _.filter(users, ['active', false]);
  9707. * // => objects for ['fred']
  9708. *
  9709. * // The `_.property` iteratee shorthand.
  9710. * _.filter(users, 'active');
  9711. * // => objects for ['barney']
  9712. *
  9713. * // Combining several predicates using `_.overEvery` or `_.overSome`.
  9714. * _.filter(users, _.overSome([{ 'age': 36 }, ['age', 40]]));
  9715. * // => objects for ['fred', 'barney']
  9716. */
  9717. function filter(collection, predicate) {
  9718. var func = isArray(collection) ? arrayFilter : baseFilter;
  9719. return func(collection, getIteratee(predicate, 3));
  9720. }
  9721. /**
  9722. * Iterates over elements of `collection`, returning the first element
  9723. * `predicate` returns truthy for. The predicate is invoked with three
  9724. * arguments: (value, index|key, collection).
  9725. *
  9726. * @static
  9727. * @memberOf _
  9728. * @since 0.1.0
  9729. * @category Collection
  9730. * @param {Array|Object} collection The collection to inspect.
  9731. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  9732. * @param {number} [fromIndex=0] The index to search from.
  9733. * @returns {*} Returns the matched element, else `undefined`.
  9734. * @example
  9735. *
  9736. * var users = [
  9737. * { 'user': 'barney', 'age': 36, 'active': true },
  9738. * { 'user': 'fred', 'age': 40, 'active': false },
  9739. * { 'user': 'pebbles', 'age': 1, 'active': true }
  9740. * ];
  9741. *
  9742. * _.find(users, function(o) { return o.age < 40; });
  9743. * // => object for 'barney'
  9744. *
  9745. * // The `_.matches` iteratee shorthand.
  9746. * _.find(users, { 'age': 1, 'active': true });
  9747. * // => object for 'pebbles'
  9748. *
  9749. * // The `_.matchesProperty` iteratee shorthand.
  9750. * _.find(users, ['active', false]);
  9751. * // => object for 'fred'
  9752. *
  9753. * // The `_.property` iteratee shorthand.
  9754. * _.find(users, 'active');
  9755. * // => object for 'barney'
  9756. */
  9757. var find = createFind(findIndex);
  9758. /**
  9759. * This method is like `_.find` except that it iterates over elements of
  9760. * `collection` from right to left.
  9761. *
  9762. * @static
  9763. * @memberOf _
  9764. * @since 2.0.0
  9765. * @category Collection
  9766. * @param {Array|Object} collection The collection to inspect.
  9767. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  9768. * @param {number} [fromIndex=collection.length-1] The index to search from.
  9769. * @returns {*} Returns the matched element, else `undefined`.
  9770. * @example
  9771. *
  9772. * _.findLast([1, 2, 3, 4], function(n) {
  9773. * return n % 2 == 1;
  9774. * });
  9775. * // => 3
  9776. */
  9777. var findLast = createFind(findLastIndex);
  9778. /**
  9779. * Creates a flattened array of values by running each element in `collection`
  9780. * thru `iteratee` and flattening the mapped results. The iteratee is invoked
  9781. * with three arguments: (value, index|key, collection).
  9782. *
  9783. * @static
  9784. * @memberOf _
  9785. * @since 4.0.0
  9786. * @category Collection
  9787. * @param {Array|Object} collection The collection to iterate over.
  9788. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  9789. * @returns {Array} Returns the new flattened array.
  9790. * @example
  9791. *
  9792. * function duplicate(n) {
  9793. * return [n, n];
  9794. * }
  9795. *
  9796. * _.flatMap([1, 2], duplicate);
  9797. * // => [1, 1, 2, 2]
  9798. */
  9799. function flatMap(collection, iteratee) {
  9800. return baseFlatten(map(collection, iteratee), 1);
  9801. }
  9802. /**
  9803. * This method is like `_.flatMap` except that it recursively flattens the
  9804. * mapped results.
  9805. *
  9806. * @static
  9807. * @memberOf _
  9808. * @since 4.7.0
  9809. * @category Collection
  9810. * @param {Array|Object} collection The collection to iterate over.
  9811. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  9812. * @returns {Array} Returns the new flattened array.
  9813. * @example
  9814. *
  9815. * function duplicate(n) {
  9816. * return [[[n, n]]];
  9817. * }
  9818. *
  9819. * _.flatMapDeep([1, 2], duplicate);
  9820. * // => [1, 1, 2, 2]
  9821. */
  9822. function flatMapDeep(collection, iteratee) {
  9823. return baseFlatten(map(collection, iteratee), INFINITY);
  9824. }
  9825. /**
  9826. * This method is like `_.flatMap` except that it recursively flattens the
  9827. * mapped results up to `depth` times.
  9828. *
  9829. * @static
  9830. * @memberOf _
  9831. * @since 4.7.0
  9832. * @category Collection
  9833. * @param {Array|Object} collection The collection to iterate over.
  9834. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  9835. * @param {number} [depth=1] The maximum recursion depth.
  9836. * @returns {Array} Returns the new flattened array.
  9837. * @example
  9838. *
  9839. * function duplicate(n) {
  9840. * return [[[n, n]]];
  9841. * }
  9842. *
  9843. * _.flatMapDepth([1, 2], duplicate, 2);
  9844. * // => [[1, 1], [2, 2]]
  9845. */
  9846. function flatMapDepth(collection, iteratee, depth) {
  9847. depth = depth === undefined ? 1 : toInteger(depth);
  9848. return baseFlatten(map(collection, iteratee), depth);
  9849. }
  9850. /**
  9851. * Iterates over elements of `collection` and invokes `iteratee` for each element.
  9852. * The iteratee is invoked with three arguments: (value, index|key, collection).
  9853. * Iteratee functions may exit iteration early by explicitly returning `false`.
  9854. *
  9855. * **Note:** As with other "Collections" methods, objects with a "length"
  9856. * property are iterated like arrays. To avoid this behavior use `_.forIn`
  9857. * or `_.forOwn` for object iteration.
  9858. *
  9859. * @static
  9860. * @memberOf _
  9861. * @since 0.1.0
  9862. * @alias each
  9863. * @category Collection
  9864. * @param {Array|Object} collection The collection to iterate over.
  9865. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  9866. * @returns {Array|Object} Returns `collection`.
  9867. * @see _.forEachRight
  9868. * @example
  9869. *
  9870. * _.forEach([1, 2], function(value) {
  9871. * console.log(value);
  9872. * });
  9873. * // => Logs `1` then `2`.
  9874. *
  9875. * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
  9876. * console.log(key);
  9877. * });
  9878. * // => Logs 'a' then 'b' (iteration order is not guaranteed).
  9879. */
  9880. function forEach(collection, iteratee) {
  9881. var func = isArray(collection) ? arrayEach : baseEach;
  9882. return func(collection, getIteratee(iteratee, 3));
  9883. }
  9884. /**
  9885. * This method is like `_.forEach` except that it iterates over elements of
  9886. * `collection` from right to left.
  9887. *
  9888. * @static
  9889. * @memberOf _
  9890. * @since 2.0.0
  9891. * @alias eachRight
  9892. * @category Collection
  9893. * @param {Array|Object} collection The collection to iterate over.
  9894. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  9895. * @returns {Array|Object} Returns `collection`.
  9896. * @see _.forEach
  9897. * @example
  9898. *
  9899. * _.forEachRight([1, 2], function(value) {
  9900. * console.log(value);
  9901. * });
  9902. * // => Logs `2` then `1`.
  9903. */
  9904. function forEachRight(collection, iteratee) {
  9905. var func = isArray(collection) ? arrayEachRight : baseEachRight;
  9906. return func(collection, getIteratee(iteratee, 3));
  9907. }
  9908. /**
  9909. * Creates an object composed of keys generated from the results of running
  9910. * each element of `collection` thru `iteratee`. The order of grouped values
  9911. * is determined by the order they occur in `collection`. The corresponding
  9912. * value of each key is an array of elements responsible for generating the
  9913. * key. The iteratee is invoked with one argument: (value).
  9914. *
  9915. * @static
  9916. * @memberOf _
  9917. * @since 0.1.0
  9918. * @category Collection
  9919. * @param {Array|Object} collection The collection to iterate over.
  9920. * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
  9921. * @returns {Object} Returns the composed aggregate object.
  9922. * @example
  9923. *
  9924. * _.groupBy([6.1, 4.2, 6.3], Math.floor);
  9925. * // => { '4': [4.2], '6': [6.1, 6.3] }
  9926. *
  9927. * // The `_.property` iteratee shorthand.
  9928. * _.groupBy(['one', 'two', 'three'], 'length');
  9929. * // => { '3': ['one', 'two'], '5': ['three'] }
  9930. */
  9931. var groupBy = createAggregator(function(result, value, key) {
  9932. if (hasOwnProperty.call(result, key)) {
  9933. result[key].push(value);
  9934. } else {
  9935. baseAssignValue(result, key, [value]);
  9936. }
  9937. });
  9938. /**
  9939. * Checks if `value` is in `collection`. If `collection` is a string, it's
  9940. * checked for a substring of `value`, otherwise
  9941. * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  9942. * is used for equality comparisons. If `fromIndex` is negative, it's used as
  9943. * the offset from the end of `collection`.
  9944. *
  9945. * @static
  9946. * @memberOf _
  9947. * @since 0.1.0
  9948. * @category Collection
  9949. * @param {Array|Object|string} collection The collection to inspect.
  9950. * @param {*} value The value to search for.
  9951. * @param {number} [fromIndex=0] The index to search from.
  9952. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
  9953. * @returns {boolean} Returns `true` if `value` is found, else `false`.
  9954. * @example
  9955. *
  9956. * _.includes([1, 2, 3], 1);
  9957. * // => true
  9958. *
  9959. * _.includes([1, 2, 3], 1, 2);
  9960. * // => false
  9961. *
  9962. * _.includes({ 'a': 1, 'b': 2 }, 1);
  9963. * // => true
  9964. *
  9965. * _.includes('abcd', 'bc');
  9966. * // => true
  9967. */
  9968. function includes(collection, value, fromIndex, guard) {
  9969. collection = isArrayLike(collection) ? collection : values(collection);
  9970. fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;
  9971. var length = collection.length;
  9972. if (fromIndex < 0) {
  9973. fromIndex = nativeMax(length + fromIndex, 0);
  9974. }
  9975. return isString(collection)
  9976. ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
  9977. : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
  9978. }
  9979. /**
  9980. * Invokes the method at `path` of each element in `collection`, returning
  9981. * an array of the results of each invoked method. Any additional arguments
  9982. * are provided to each invoked method. If `path` is a function, it's invoked
  9983. * for, and `this` bound to, each element in `collection`.
  9984. *
  9985. * @static
  9986. * @memberOf _
  9987. * @since 4.0.0
  9988. * @category Collection
  9989. * @param {Array|Object} collection The collection to iterate over.
  9990. * @param {Array|Function|string} path The path of the method to invoke or
  9991. * the function invoked per iteration.
  9992. * @param {...*} [args] The arguments to invoke each method with.
  9993. * @returns {Array} Returns the array of results.
  9994. * @example
  9995. *
  9996. * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
  9997. * // => [[1, 5, 7], [1, 2, 3]]
  9998. *
  9999. * _.invokeMap([123, 456], String.prototype.split, '');
  10000. * // => [['1', '2', '3'], ['4', '5', '6']]
  10001. */
  10002. var invokeMap = baseRest(function(collection, path, args) {
  10003. var index = -1,
  10004. isFunc = typeof path == 'function',
  10005. result = isArrayLike(collection) ? Array(collection.length) : [];
  10006. baseEach(collection, function(value) {
  10007. result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
  10008. });
  10009. return result;
  10010. });
  10011. /**
  10012. * Creates an object composed of keys generated from the results of running
  10013. * each element of `collection` thru `iteratee`. The corresponding value of
  10014. * each key is the last element responsible for generating the key. The
  10015. * iteratee is invoked with one argument: (value).
  10016. *
  10017. * @static
  10018. * @memberOf _
  10019. * @since 4.0.0
  10020. * @category Collection
  10021. * @param {Array|Object} collection The collection to iterate over.
  10022. * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
  10023. * @returns {Object} Returns the composed aggregate object.
  10024. * @example
  10025. *
  10026. * var array = [
  10027. * { 'dir': 'left', 'code': 97 },
  10028. * { 'dir': 'right', 'code': 100 }
  10029. * ];
  10030. *
  10031. * _.keyBy(array, function(o) {
  10032. * return String.fromCharCode(o.code);
  10033. * });
  10034. * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
  10035. *
  10036. * _.keyBy(array, 'dir');
  10037. * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
  10038. */
  10039. var keyBy = createAggregator(function(result, value, key) {
  10040. baseAssignValue(result, key, value);
  10041. });
  10042. /**
  10043. * Creates an array of values by running each element in `collection` thru
  10044. * `iteratee`. The iteratee is invoked with three arguments:
  10045. * (value, index|key, collection).
  10046. *
  10047. * Many lodash methods are guarded to work as iteratees for methods like
  10048. * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
  10049. *
  10050. * The guarded methods are:
  10051. * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
  10052. * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
  10053. * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
  10054. * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
  10055. *
  10056. * @static
  10057. * @memberOf _
  10058. * @since 0.1.0
  10059. * @category Collection
  10060. * @param {Array|Object} collection The collection to iterate over.
  10061. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  10062. * @returns {Array} Returns the new mapped array.
  10063. * @example
  10064. *
  10065. * function square(n) {
  10066. * return n * n;
  10067. * }
  10068. *
  10069. * _.map([4, 8], square);
  10070. * // => [16, 64]
  10071. *
  10072. * _.map({ 'a': 4, 'b': 8 }, square);
  10073. * // => [16, 64] (iteration order is not guaranteed)
  10074. *
  10075. * var users = [
  10076. * { 'user': 'barney' },
  10077. * { 'user': 'fred' }
  10078. * ];
  10079. *
  10080. * // The `_.property` iteratee shorthand.
  10081. * _.map(users, 'user');
  10082. * // => ['barney', 'fred']
  10083. */
  10084. function map(collection, iteratee) {
  10085. var func = isArray(collection) ? arrayMap : baseMap;
  10086. return func(collection, getIteratee(iteratee, 3));
  10087. }
  10088. /**
  10089. * This method is like `_.sortBy` except that it allows specifying the sort
  10090. * orders of the iteratees to sort by. If `orders` is unspecified, all values
  10091. * are sorted in ascending order. Otherwise, specify an order of "desc" for
  10092. * descending or "asc" for ascending sort order of corresponding values.
  10093. *
  10094. * @static
  10095. * @memberOf _
  10096. * @since 4.0.0
  10097. * @category Collection
  10098. * @param {Array|Object} collection The collection to iterate over.
  10099. * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
  10100. * The iteratees to sort by.
  10101. * @param {string[]} [orders] The sort orders of `iteratees`.
  10102. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
  10103. * @returns {Array} Returns the new sorted array.
  10104. * @example
  10105. *
  10106. * var users = [
  10107. * { 'user': 'fred', 'age': 48 },
  10108. * { 'user': 'barney', 'age': 34 },
  10109. * { 'user': 'fred', 'age': 40 },
  10110. * { 'user': 'barney', 'age': 36 }
  10111. * ];
  10112. *
  10113. * // Sort by `user` in ascending order and by `age` in descending order.
  10114. * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
  10115. * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
  10116. */
  10117. function orderBy(collection, iteratees, orders, guard) {
  10118. if (collection == null) {
  10119. return [];
  10120. }
  10121. if (!isArray(iteratees)) {
  10122. iteratees = iteratees == null ? [] : [iteratees];
  10123. }
  10124. orders = guard ? undefined : orders;
  10125. if (!isArray(orders)) {
  10126. orders = orders == null ? [] : [orders];
  10127. }
  10128. return baseOrderBy(collection, iteratees, orders);
  10129. }
  10130. /**
  10131. * Creates an array of elements split into two groups, the first of which
  10132. * contains elements `predicate` returns truthy for, the second of which
  10133. * contains elements `predicate` returns falsey for. The predicate is
  10134. * invoked with one argument: (value).
  10135. *
  10136. * @static
  10137. * @memberOf _
  10138. * @since 3.0.0
  10139. * @category Collection
  10140. * @param {Array|Object} collection The collection to iterate over.
  10141. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  10142. * @returns {Array} Returns the array of grouped elements.
  10143. * @example
  10144. *
  10145. * var users = [
  10146. * { 'user': 'barney', 'age': 36, 'active': false },
  10147. * { 'user': 'fred', 'age': 40, 'active': true },
  10148. * { 'user': 'pebbles', 'age': 1, 'active': false }
  10149. * ];
  10150. *
  10151. * _.partition(users, function(o) { return o.active; });
  10152. * // => objects for [['fred'], ['barney', 'pebbles']]
  10153. *
  10154. * // The `_.matches` iteratee shorthand.
  10155. * _.partition(users, { 'age': 1, 'active': false });
  10156. * // => objects for [['pebbles'], ['barney', 'fred']]
  10157. *
  10158. * // The `_.matchesProperty` iteratee shorthand.
  10159. * _.partition(users, ['active', false]);
  10160. * // => objects for [['barney', 'pebbles'], ['fred']]
  10161. *
  10162. * // The `_.property` iteratee shorthand.
  10163. * _.partition(users, 'active');
  10164. * // => objects for [['fred'], ['barney', 'pebbles']]
  10165. */
  10166. var partition = createAggregator(function(result, value, key) {
  10167. result[key ? 0 : 1].push(value);
  10168. }, function() { return [[], []]; });
  10169. /**
  10170. * Reduces `collection` to a value which is the accumulated result of running
  10171. * each element in `collection` thru `iteratee`, where each successive
  10172. * invocation is supplied the return value of the previous. If `accumulator`
  10173. * is not given, the first element of `collection` is used as the initial
  10174. * value. The iteratee is invoked with four arguments:
  10175. * (accumulator, value, index|key, collection).
  10176. *
  10177. * Many lodash methods are guarded to work as iteratees for methods like
  10178. * `_.reduce`, `_.reduceRight`, and `_.transform`.
  10179. *
  10180. * The guarded methods are:
  10181. * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
  10182. * and `sortBy`
  10183. *
  10184. * @static
  10185. * @memberOf _
  10186. * @since 0.1.0
  10187. * @category Collection
  10188. * @param {Array|Object} collection The collection to iterate over.
  10189. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  10190. * @param {*} [accumulator] The initial value.
  10191. * @returns {*} Returns the accumulated value.
  10192. * @see _.reduceRight
  10193. * @example
  10194. *
  10195. * _.reduce([1, 2], function(sum, n) {
  10196. * return sum + n;
  10197. * }, 0);
  10198. * // => 3
  10199. *
  10200. * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
  10201. * (result[value] || (result[value] = [])).push(key);
  10202. * return result;
  10203. * }, {});
  10204. * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
  10205. */
  10206. function reduce(collection, iteratee, accumulator) {
  10207. var func = isArray(collection) ? arrayReduce : baseReduce,
  10208. initAccum = arguments.length < 3;
  10209. return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
  10210. }
  10211. /**
  10212. * This method is like `_.reduce` except that it iterates over elements of
  10213. * `collection` from right to left.
  10214. *
  10215. * @static
  10216. * @memberOf _
  10217. * @since 0.1.0
  10218. * @category Collection
  10219. * @param {Array|Object} collection The collection to iterate over.
  10220. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  10221. * @param {*} [accumulator] The initial value.
  10222. * @returns {*} Returns the accumulated value.
  10223. * @see _.reduce
  10224. * @example
  10225. *
  10226. * var array = [[0, 1], [2, 3], [4, 5]];
  10227. *
  10228. * _.reduceRight(array, function(flattened, other) {
  10229. * return flattened.concat(other);
  10230. * }, []);
  10231. * // => [4, 5, 2, 3, 0, 1]
  10232. */
  10233. function reduceRight(collection, iteratee, accumulator) {
  10234. var func = isArray(collection) ? arrayReduceRight : baseReduce,
  10235. initAccum = arguments.length < 3;
  10236. return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
  10237. }
  10238. /**
  10239. * The opposite of `_.filter`; this method returns the elements of `collection`
  10240. * that `predicate` does **not** return truthy for.
  10241. *
  10242. * @static
  10243. * @memberOf _
  10244. * @since 0.1.0
  10245. * @category Collection
  10246. * @param {Array|Object} collection The collection to iterate over.
  10247. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  10248. * @returns {Array} Returns the new filtered array.
  10249. * @see _.filter
  10250. * @example
  10251. *
  10252. * var users = [
  10253. * { 'user': 'barney', 'age': 36, 'active': false },
  10254. * { 'user': 'fred', 'age': 40, 'active': true }
  10255. * ];
  10256. *
  10257. * _.reject(users, function(o) { return !o.active; });
  10258. * // => objects for ['fred']
  10259. *
  10260. * // The `_.matches` iteratee shorthand.
  10261. * _.reject(users, { 'age': 40, 'active': true });
  10262. * // => objects for ['barney']
  10263. *
  10264. * // The `_.matchesProperty` iteratee shorthand.
  10265. * _.reject(users, ['active', false]);
  10266. * // => objects for ['fred']
  10267. *
  10268. * // The `_.property` iteratee shorthand.
  10269. * _.reject(users, 'active');
  10270. * // => objects for ['barney']
  10271. */
  10272. function reject(collection, predicate) {
  10273. var func = isArray(collection) ? arrayFilter : baseFilter;
  10274. return func(collection, negate(getIteratee(predicate, 3)));
  10275. }
  10276. /**
  10277. * Gets a random element from `collection`.
  10278. *
  10279. * @static
  10280. * @memberOf _
  10281. * @since 2.0.0
  10282. * @category Collection
  10283. * @param {Array|Object} collection The collection to sample.
  10284. * @returns {*} Returns the random element.
  10285. * @example
  10286. *
  10287. * _.sample([1, 2, 3, 4]);
  10288. * // => 2
  10289. */
  10290. function sample(collection) {
  10291. var func = isArray(collection) ? arraySample : baseSample;
  10292. return func(collection);
  10293. }
  10294. /**
  10295. * Gets `n` random elements at unique keys from `collection` up to the
  10296. * size of `collection`.
  10297. *
  10298. * @static
  10299. * @memberOf _
  10300. * @since 4.0.0
  10301. * @category Collection
  10302. * @param {Array|Object} collection The collection to sample.
  10303. * @param {number} [n=1] The number of elements to sample.
  10304. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  10305. * @returns {Array} Returns the random elements.
  10306. * @example
  10307. *
  10308. * _.sampleSize([1, 2, 3], 2);
  10309. * // => [3, 1]
  10310. *
  10311. * _.sampleSize([1, 2, 3], 4);
  10312. * // => [2, 3, 1]
  10313. */
  10314. function sampleSize(collection, n, guard) {
  10315. if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
  10316. n = 1;
  10317. } else {
  10318. n = toInteger(n);
  10319. }
  10320. var func = isArray(collection) ? arraySampleSize : baseSampleSize;
  10321. return func(collection, n);
  10322. }
  10323. /**
  10324. * Creates an array of shuffled values, using a version of the
  10325. * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
  10326. *
  10327. * @static
  10328. * @memberOf _
  10329. * @since 0.1.0
  10330. * @category Collection
  10331. * @param {Array|Object} collection The collection to shuffle.
  10332. * @returns {Array} Returns the new shuffled array.
  10333. * @example
  10334. *
  10335. * _.shuffle([1, 2, 3, 4]);
  10336. * // => [4, 1, 3, 2]
  10337. */
  10338. function shuffle(collection) {
  10339. var func = isArray(collection) ? arrayShuffle : baseShuffle;
  10340. return func(collection);
  10341. }
  10342. /**
  10343. * Gets the size of `collection` by returning its length for array-like
  10344. * values or the number of own enumerable string keyed properties for objects.
  10345. *
  10346. * @static
  10347. * @memberOf _
  10348. * @since 0.1.0
  10349. * @category Collection
  10350. * @param {Array|Object|string} collection The collection to inspect.
  10351. * @returns {number} Returns the collection size.
  10352. * @example
  10353. *
  10354. * _.size([1, 2, 3]);
  10355. * // => 3
  10356. *
  10357. * _.size({ 'a': 1, 'b': 2 });
  10358. * // => 2
  10359. *
  10360. * _.size('pebbles');
  10361. * // => 7
  10362. */
  10363. function size(collection) {
  10364. if (collection == null) {
  10365. return 0;
  10366. }
  10367. if (isArrayLike(collection)) {
  10368. return isString(collection) ? stringSize(collection) : collection.length;
  10369. }
  10370. var tag = getTag(collection);
  10371. if (tag == mapTag || tag == setTag) {
  10372. return collection.size;
  10373. }
  10374. return baseKeys(collection).length;
  10375. }
  10376. /**
  10377. * Checks if `predicate` returns truthy for **any** element of `collection`.
  10378. * Iteration is stopped once `predicate` returns truthy. The predicate is
  10379. * invoked with three arguments: (value, index|key, collection).
  10380. *
  10381. * @static
  10382. * @memberOf _
  10383. * @since 0.1.0
  10384. * @category Collection
  10385. * @param {Array|Object} collection The collection to iterate over.
  10386. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  10387. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  10388. * @returns {boolean} Returns `true` if any element passes the predicate check,
  10389. * else `false`.
  10390. * @example
  10391. *
  10392. * _.some([null, 0, 'yes', false], Boolean);
  10393. * // => true
  10394. *
  10395. * var users = [
  10396. * { 'user': 'barney', 'active': true },
  10397. * { 'user': 'fred', 'active': false }
  10398. * ];
  10399. *
  10400. * // The `_.matches` iteratee shorthand.
  10401. * _.some(users, { 'user': 'barney', 'active': false });
  10402. * // => false
  10403. *
  10404. * // The `_.matchesProperty` iteratee shorthand.
  10405. * _.some(users, ['active', false]);
  10406. * // => true
  10407. *
  10408. * // The `_.property` iteratee shorthand.
  10409. * _.some(users, 'active');
  10410. * // => true
  10411. */
  10412. function some(collection, predicate, guard) {
  10413. var func = isArray(collection) ? arraySome : baseSome;
  10414. if (guard && isIterateeCall(collection, predicate, guard)) {
  10415. predicate = undefined;
  10416. }
  10417. return func(collection, getIteratee(predicate, 3));
  10418. }
  10419. /**
  10420. * Creates an array of elements, sorted in ascending order by the results of
  10421. * running each element in a collection thru each iteratee. This method
  10422. * performs a stable sort, that is, it preserves the original sort order of
  10423. * equal elements. The iteratees are invoked with one argument: (value).
  10424. *
  10425. * @static
  10426. * @memberOf _
  10427. * @since 0.1.0
  10428. * @category Collection
  10429. * @param {Array|Object} collection The collection to iterate over.
  10430. * @param {...(Function|Function[])} [iteratees=[_.identity]]
  10431. * The iteratees to sort by.
  10432. * @returns {Array} Returns the new sorted array.
  10433. * @example
  10434. *
  10435. * var users = [
  10436. * { 'user': 'fred', 'age': 48 },
  10437. * { 'user': 'barney', 'age': 36 },
  10438. * { 'user': 'fred', 'age': 30 },
  10439. * { 'user': 'barney', 'age': 34 }
  10440. * ];
  10441. *
  10442. * _.sortBy(users, [function(o) { return o.user; }]);
  10443. * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 30]]
  10444. *
  10445. * _.sortBy(users, ['user', 'age']);
  10446. * // => objects for [['barney', 34], ['barney', 36], ['fred', 30], ['fred', 48]]
  10447. */
  10448. var sortBy = baseRest(function(collection, iteratees) {
  10449. if (collection == null) {
  10450. return [];
  10451. }
  10452. var length = iteratees.length;
  10453. if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
  10454. iteratees = [];
  10455. } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
  10456. iteratees = [iteratees[0]];
  10457. }
  10458. return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
  10459. });
  10460. /*------------------------------------------------------------------------*/
  10461. /**
  10462. * Gets the timestamp of the number of milliseconds that have elapsed since
  10463. * the Unix epoch (1 January 1970 00:00:00 UTC).
  10464. *
  10465. * @static
  10466. * @memberOf _
  10467. * @since 2.4.0
  10468. * @category Date
  10469. * @returns {number} Returns the timestamp.
  10470. * @example
  10471. *
  10472. * _.defer(function(stamp) {
  10473. * console.log(_.now() - stamp);
  10474. * }, _.now());
  10475. * // => Logs the number of milliseconds it took for the deferred invocation.
  10476. */
  10477. var now = ctxNow || function() {
  10478. return root.Date.now();
  10479. };
  10480. /*------------------------------------------------------------------------*/
  10481. /**
  10482. * The opposite of `_.before`; this method creates a function that invokes
  10483. * `func` once it's called `n` or more times.
  10484. *
  10485. * @static
  10486. * @memberOf _
  10487. * @since 0.1.0
  10488. * @category Function
  10489. * @param {number} n The number of calls before `func` is invoked.
  10490. * @param {Function} func The function to restrict.
  10491. * @returns {Function} Returns the new restricted function.
  10492. * @example
  10493. *
  10494. * var saves = ['profile', 'settings'];
  10495. *
  10496. * var done = _.after(saves.length, function() {
  10497. * console.log('done saving!');
  10498. * });
  10499. *
  10500. * _.forEach(saves, function(type) {
  10501. * asyncSave({ 'type': type, 'complete': done });
  10502. * });
  10503. * // => Logs 'done saving!' after the two async saves have completed.
  10504. */
  10505. function after(n, func) {
  10506. if (typeof func != 'function') {
  10507. throw new TypeError(FUNC_ERROR_TEXT);
  10508. }
  10509. n = toInteger(n);
  10510. return function() {
  10511. if (--n < 1) {
  10512. return func.apply(this, arguments);
  10513. }
  10514. };
  10515. }
  10516. /**
  10517. * Creates a function that invokes `func`, with up to `n` arguments,
  10518. * ignoring any additional arguments.
  10519. *
  10520. * @static
  10521. * @memberOf _
  10522. * @since 3.0.0
  10523. * @category Function
  10524. * @param {Function} func The function to cap arguments for.
  10525. * @param {number} [n=func.length] The arity cap.
  10526. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  10527. * @returns {Function} Returns the new capped function.
  10528. * @example
  10529. *
  10530. * _.map(['6', '8', '10'], _.ary(parseInt, 1));
  10531. * // => [6, 8, 10]
  10532. */
  10533. function ary(func, n, guard) {
  10534. n = guard ? undefined : n;
  10535. n = (func && n == null) ? func.length : n;
  10536. return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
  10537. }
  10538. /**
  10539. * Creates a function that invokes `func`, with the `this` binding and arguments
  10540. * of the created function, while it's called less than `n` times. Subsequent
  10541. * calls to the created function return the result of the last `func` invocation.
  10542. *
  10543. * @static
  10544. * @memberOf _
  10545. * @since 3.0.0
  10546. * @category Function
  10547. * @param {number} n The number of calls at which `func` is no longer invoked.
  10548. * @param {Function} func The function to restrict.
  10549. * @returns {Function} Returns the new restricted function.
  10550. * @example
  10551. *
  10552. * jQuery(element).on('click', _.before(5, addContactToList));
  10553. * // => Allows adding up to 4 contacts to the list.
  10554. */
  10555. function before(n, func) {
  10556. var result;
  10557. if (typeof func != 'function') {
  10558. throw new TypeError(FUNC_ERROR_TEXT);
  10559. }
  10560. n = toInteger(n);
  10561. return function() {
  10562. if (--n > 0) {
  10563. result = func.apply(this, arguments);
  10564. }
  10565. if (n <= 1) {
  10566. func = undefined;
  10567. }
  10568. return result;
  10569. };
  10570. }
  10571. /**
  10572. * Creates a function that invokes `func` with the `this` binding of `thisArg`
  10573. * and `partials` prepended to the arguments it receives.
  10574. *
  10575. * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
  10576. * may be used as a placeholder for partially applied arguments.
  10577. *
  10578. * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
  10579. * property of bound functions.
  10580. *
  10581. * @static
  10582. * @memberOf _
  10583. * @since 0.1.0
  10584. * @category Function
  10585. * @param {Function} func The function to bind.
  10586. * @param {*} thisArg The `this` binding of `func`.
  10587. * @param {...*} [partials] The arguments to be partially applied.
  10588. * @returns {Function} Returns the new bound function.
  10589. * @example
  10590. *
  10591. * function greet(greeting, punctuation) {
  10592. * return greeting + ' ' + this.user + punctuation;
  10593. * }
  10594. *
  10595. * var object = { 'user': 'fred' };
  10596. *
  10597. * var bound = _.bind(greet, object, 'hi');
  10598. * bound('!');
  10599. * // => 'hi fred!'
  10600. *
  10601. * // Bound with placeholders.
  10602. * var bound = _.bind(greet, object, _, '!');
  10603. * bound('hi');
  10604. * // => 'hi fred!'
  10605. */
  10606. var bind = baseRest(function(func, thisArg, partials) {
  10607. var bitmask = WRAP_BIND_FLAG;
  10608. if (partials.length) {
  10609. var holders = replaceHolders(partials, getHolder(bind));
  10610. bitmask |= WRAP_PARTIAL_FLAG;
  10611. }
  10612. return createWrap(func, bitmask, thisArg, partials, holders);
  10613. });
  10614. /**
  10615. * Creates a function that invokes the method at `object[key]` with `partials`
  10616. * prepended to the arguments it receives.
  10617. *
  10618. * This method differs from `_.bind` by allowing bound functions to reference
  10619. * methods that may be redefined or don't yet exist. See
  10620. * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
  10621. * for more details.
  10622. *
  10623. * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
  10624. * builds, may be used as a placeholder for partially applied arguments.
  10625. *
  10626. * @static
  10627. * @memberOf _
  10628. * @since 0.10.0
  10629. * @category Function
  10630. * @param {Object} object The object to invoke the method on.
  10631. * @param {string} key The key of the method.
  10632. * @param {...*} [partials] The arguments to be partially applied.
  10633. * @returns {Function} Returns the new bound function.
  10634. * @example
  10635. *
  10636. * var object = {
  10637. * 'user': 'fred',
  10638. * 'greet': function(greeting, punctuation) {
  10639. * return greeting + ' ' + this.user + punctuation;
  10640. * }
  10641. * };
  10642. *
  10643. * var bound = _.bindKey(object, 'greet', 'hi');
  10644. * bound('!');
  10645. * // => 'hi fred!'
  10646. *
  10647. * object.greet = function(greeting, punctuation) {
  10648. * return greeting + 'ya ' + this.user + punctuation;
  10649. * };
  10650. *
  10651. * bound('!');
  10652. * // => 'hiya fred!'
  10653. *
  10654. * // Bound with placeholders.
  10655. * var bound = _.bindKey(object, 'greet', _, '!');
  10656. * bound('hi');
  10657. * // => 'hiya fred!'
  10658. */
  10659. var bindKey = baseRest(function(object, key, partials) {
  10660. var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
  10661. if (partials.length) {
  10662. var holders = replaceHolders(partials, getHolder(bindKey));
  10663. bitmask |= WRAP_PARTIAL_FLAG;
  10664. }
  10665. return createWrap(key, bitmask, object, partials, holders);
  10666. });
  10667. /**
  10668. * Creates a function that accepts arguments of `func` and either invokes
  10669. * `func` returning its result, if at least `arity` number of arguments have
  10670. * been provided, or returns a function that accepts the remaining `func`
  10671. * arguments, and so on. The arity of `func` may be specified if `func.length`
  10672. * is not sufficient.
  10673. *
  10674. * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
  10675. * may be used as a placeholder for provided arguments.
  10676. *
  10677. * **Note:** This method doesn't set the "length" property of curried functions.
  10678. *
  10679. * @static
  10680. * @memberOf _
  10681. * @since 2.0.0
  10682. * @category Function
  10683. * @param {Function} func The function to curry.
  10684. * @param {number} [arity=func.length] The arity of `func`.
  10685. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  10686. * @returns {Function} Returns the new curried function.
  10687. * @example
  10688. *
  10689. * var abc = function(a, b, c) {
  10690. * return [a, b, c];
  10691. * };
  10692. *
  10693. * var curried = _.curry(abc);
  10694. *
  10695. * curried(1)(2)(3);
  10696. * // => [1, 2, 3]
  10697. *
  10698. * curried(1, 2)(3);
  10699. * // => [1, 2, 3]
  10700. *
  10701. * curried(1, 2, 3);
  10702. * // => [1, 2, 3]
  10703. *
  10704. * // Curried with placeholders.
  10705. * curried(1)(_, 3)(2);
  10706. * // => [1, 2, 3]
  10707. */
  10708. function curry(func, arity, guard) {
  10709. arity = guard ? undefined : arity;
  10710. var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
  10711. result.placeholder = curry.placeholder;
  10712. return result;
  10713. }
  10714. /**
  10715. * This method is like `_.curry` except that arguments are applied to `func`
  10716. * in the manner of `_.partialRight` instead of `_.partial`.
  10717. *
  10718. * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
  10719. * builds, may be used as a placeholder for provided arguments.
  10720. *
  10721. * **Note:** This method doesn't set the "length" property of curried functions.
  10722. *
  10723. * @static
  10724. * @memberOf _
  10725. * @since 3.0.0
  10726. * @category Function
  10727. * @param {Function} func The function to curry.
  10728. * @param {number} [arity=func.length] The arity of `func`.
  10729. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  10730. * @returns {Function} Returns the new curried function.
  10731. * @example
  10732. *
  10733. * var abc = function(a, b, c) {
  10734. * return [a, b, c];
  10735. * };
  10736. *
  10737. * var curried = _.curryRight(abc);
  10738. *
  10739. * curried(3)(2)(1);
  10740. * // => [1, 2, 3]
  10741. *
  10742. * curried(2, 3)(1);
  10743. * // => [1, 2, 3]
  10744. *
  10745. * curried(1, 2, 3);
  10746. * // => [1, 2, 3]
  10747. *
  10748. * // Curried with placeholders.
  10749. * curried(3)(1, _)(2);
  10750. * // => [1, 2, 3]
  10751. */
  10752. function curryRight(func, arity, guard) {
  10753. arity = guard ? undefined : arity;
  10754. var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
  10755. result.placeholder = curryRight.placeholder;
  10756. return result;
  10757. }
  10758. /**
  10759. * Creates a debounced function that delays invoking `func` until after `wait`
  10760. * milliseconds have elapsed since the last time the debounced function was
  10761. * invoked. The debounced function comes with a `cancel` method to cancel
  10762. * delayed `func` invocations and a `flush` method to immediately invoke them.
  10763. * Provide `options` to indicate whether `func` should be invoked on the
  10764. * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
  10765. * with the last arguments provided to the debounced function. Subsequent
  10766. * calls to the debounced function return the result of the last `func`
  10767. * invocation.
  10768. *
  10769. * **Note:** If `leading` and `trailing` options are `true`, `func` is
  10770. * invoked on the trailing edge of the timeout only if the debounced function
  10771. * is invoked more than once during the `wait` timeout.
  10772. *
  10773. * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
  10774. * until to the next tick, similar to `setTimeout` with a timeout of `0`.
  10775. *
  10776. * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
  10777. * for details over the differences between `_.debounce` and `_.throttle`.
  10778. *
  10779. * @static
  10780. * @memberOf _
  10781. * @since 0.1.0
  10782. * @category Function
  10783. * @param {Function} func The function to debounce.
  10784. * @param {number} [wait=0] The number of milliseconds to delay.
  10785. * @param {Object} [options={}] The options object.
  10786. * @param {boolean} [options.leading=false]
  10787. * Specify invoking on the leading edge of the timeout.
  10788. * @param {number} [options.maxWait]
  10789. * The maximum time `func` is allowed to be delayed before it's invoked.
  10790. * @param {boolean} [options.trailing=true]
  10791. * Specify invoking on the trailing edge of the timeout.
  10792. * @returns {Function} Returns the new debounced function.
  10793. * @example
  10794. *
  10795. * // Avoid costly calculations while the window size is in flux.
  10796. * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
  10797. *
  10798. * // Invoke `sendMail` when clicked, debouncing subsequent calls.
  10799. * jQuery(element).on('click', _.debounce(sendMail, 300, {
  10800. * 'leading': true,
  10801. * 'trailing': false
  10802. * }));
  10803. *
  10804. * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
  10805. * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
  10806. * var source = new EventSource('/stream');
  10807. * jQuery(source).on('message', debounced);
  10808. *
  10809. * // Cancel the trailing debounced invocation.
  10810. * jQuery(window).on('popstate', debounced.cancel);
  10811. */
  10812. function debounce(func, wait, options) {
  10813. var lastArgs,
  10814. lastThis,
  10815. maxWait,
  10816. result,
  10817. timerId,
  10818. lastCallTime,
  10819. lastInvokeTime = 0,
  10820. leading = false,
  10821. maxing = false,
  10822. trailing = true;
  10823. if (typeof func != 'function') {
  10824. throw new TypeError(FUNC_ERROR_TEXT);
  10825. }
  10826. wait = toNumber(wait) || 0;
  10827. if (isObject(options)) {
  10828. leading = !!options.leading;
  10829. maxing = 'maxWait' in options;
  10830. maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
  10831. trailing = 'trailing' in options ? !!options.trailing : trailing;
  10832. }
  10833. function invokeFunc(time) {
  10834. var args = lastArgs,
  10835. thisArg = lastThis;
  10836. lastArgs = lastThis = undefined;
  10837. lastInvokeTime = time;
  10838. result = func.apply(thisArg, args);
  10839. return result;
  10840. }
  10841. function leadingEdge(time) {
  10842. // Reset any `maxWait` timer.
  10843. lastInvokeTime = time;
  10844. // Start the timer for the trailing edge.
  10845. timerId = setTimeout(timerExpired, wait);
  10846. // Invoke the leading edge.
  10847. return leading ? invokeFunc(time) : result;
  10848. }
  10849. function remainingWait(time) {
  10850. var timeSinceLastCall = time - lastCallTime,
  10851. timeSinceLastInvoke = time - lastInvokeTime,
  10852. timeWaiting = wait - timeSinceLastCall;
  10853. return maxing
  10854. ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)
  10855. : timeWaiting;
  10856. }
  10857. function shouldInvoke(time) {
  10858. var timeSinceLastCall = time - lastCallTime,
  10859. timeSinceLastInvoke = time - lastInvokeTime;
  10860. // Either this is the first call, activity has stopped and we're at the
  10861. // trailing edge, the system time has gone backwards and we're treating
  10862. // it as the trailing edge, or we've hit the `maxWait` limit.
  10863. return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
  10864. (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
  10865. }
  10866. function timerExpired() {
  10867. var time = now();
  10868. if (shouldInvoke(time)) {
  10869. return trailingEdge(time);
  10870. }
  10871. // Restart the timer.
  10872. timerId = setTimeout(timerExpired, remainingWait(time));
  10873. }
  10874. function trailingEdge(time) {
  10875. timerId = undefined;
  10876. // Only invoke if we have `lastArgs` which means `func` has been
  10877. // debounced at least once.
  10878. if (trailing && lastArgs) {
  10879. return invokeFunc(time);
  10880. }
  10881. lastArgs = lastThis = undefined;
  10882. return result;
  10883. }
  10884. function cancel() {
  10885. if (timerId !== undefined) {
  10886. clearTimeout(timerId);
  10887. }
  10888. lastInvokeTime = 0;
  10889. lastArgs = lastCallTime = lastThis = timerId = undefined;
  10890. }
  10891. function flush() {
  10892. return timerId === undefined ? result : trailingEdge(now());
  10893. }
  10894. function debounced() {
  10895. var time = now(),
  10896. isInvoking = shouldInvoke(time);
  10897. lastArgs = arguments;
  10898. lastThis = this;
  10899. lastCallTime = time;
  10900. if (isInvoking) {
  10901. if (timerId === undefined) {
  10902. return leadingEdge(lastCallTime);
  10903. }
  10904. if (maxing) {
  10905. // Handle invocations in a tight loop.
  10906. clearTimeout(timerId);
  10907. timerId = setTimeout(timerExpired, wait);
  10908. return invokeFunc(lastCallTime);
  10909. }
  10910. }
  10911. if (timerId === undefined) {
  10912. timerId = setTimeout(timerExpired, wait);
  10913. }
  10914. return result;
  10915. }
  10916. debounced.cancel = cancel;
  10917. debounced.flush = flush;
  10918. return debounced;
  10919. }
  10920. /**
  10921. * Defers invoking the `func` until the current call stack has cleared. Any
  10922. * additional arguments are provided to `func` when it's invoked.
  10923. *
  10924. * @static
  10925. * @memberOf _
  10926. * @since 0.1.0
  10927. * @category Function
  10928. * @param {Function} func The function to defer.
  10929. * @param {...*} [args] The arguments to invoke `func` with.
  10930. * @returns {number} Returns the timer id.
  10931. * @example
  10932. *
  10933. * _.defer(function(text) {
  10934. * console.log(text);
  10935. * }, 'deferred');
  10936. * // => Logs 'deferred' after one millisecond.
  10937. */
  10938. var defer = baseRest(function(func, args) {
  10939. return baseDelay(func, 1, args);
  10940. });
  10941. /**
  10942. * Invokes `func` after `wait` milliseconds. Any additional arguments are
  10943. * provided to `func` when it's invoked.
  10944. *
  10945. * @static
  10946. * @memberOf _
  10947. * @since 0.1.0
  10948. * @category Function
  10949. * @param {Function} func The function to delay.
  10950. * @param {number} wait The number of milliseconds to delay invocation.
  10951. * @param {...*} [args] The arguments to invoke `func` with.
  10952. * @returns {number} Returns the timer id.
  10953. * @example
  10954. *
  10955. * _.delay(function(text) {
  10956. * console.log(text);
  10957. * }, 1000, 'later');
  10958. * // => Logs 'later' after one second.
  10959. */
  10960. var delay = baseRest(function(func, wait, args) {
  10961. return baseDelay(func, toNumber(wait) || 0, args);
  10962. });
  10963. /**
  10964. * Creates a function that invokes `func` with arguments reversed.
  10965. *
  10966. * @static
  10967. * @memberOf _
  10968. * @since 4.0.0
  10969. * @category Function
  10970. * @param {Function} func The function to flip arguments for.
  10971. * @returns {Function} Returns the new flipped function.
  10972. * @example
  10973. *
  10974. * var flipped = _.flip(function() {
  10975. * return _.toArray(arguments);
  10976. * });
  10977. *
  10978. * flipped('a', 'b', 'c', 'd');
  10979. * // => ['d', 'c', 'b', 'a']
  10980. */
  10981. function flip(func) {
  10982. return createWrap(func, WRAP_FLIP_FLAG);
  10983. }
  10984. /**
  10985. * Creates a function that memoizes the result of `func`. If `resolver` is
  10986. * provided, it determines the cache key for storing the result based on the
  10987. * arguments provided to the memoized function. By default, the first argument
  10988. * provided to the memoized function is used as the map cache key. The `func`
  10989. * is invoked with the `this` binding of the memoized function.
  10990. *
  10991. * **Note:** The cache is exposed as the `cache` property on the memoized
  10992. * function. Its creation may be customized by replacing the `_.memoize.Cache`
  10993. * constructor with one whose instances implement the
  10994. * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
  10995. * method interface of `clear`, `delete`, `get`, `has`, and `set`.
  10996. *
  10997. * @static
  10998. * @memberOf _
  10999. * @since 0.1.0
  11000. * @category Function
  11001. * @param {Function} func The function to have its output memoized.
  11002. * @param {Function} [resolver] The function to resolve the cache key.
  11003. * @returns {Function} Returns the new memoized function.
  11004. * @example
  11005. *
  11006. * var object = { 'a': 1, 'b': 2 };
  11007. * var other = { 'c': 3, 'd': 4 };
  11008. *
  11009. * var values = _.memoize(_.values);
  11010. * values(object);
  11011. * // => [1, 2]
  11012. *
  11013. * values(other);
  11014. * // => [3, 4]
  11015. *
  11016. * object.a = 2;
  11017. * values(object);
  11018. * // => [1, 2]
  11019. *
  11020. * // Modify the result cache.
  11021. * values.cache.set(object, ['a', 'b']);
  11022. * values(object);
  11023. * // => ['a', 'b']
  11024. *
  11025. * // Replace `_.memoize.Cache`.
  11026. * _.memoize.Cache = WeakMap;
  11027. */
  11028. function memoize(func, resolver) {
  11029. if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
  11030. throw new TypeError(FUNC_ERROR_TEXT);
  11031. }
  11032. var memoized = function() {
  11033. var args = arguments,
  11034. key = resolver ? resolver.apply(this, args) : args[0],
  11035. cache = memoized.cache;
  11036. if (cache.has(key)) {
  11037. return cache.get(key);
  11038. }
  11039. var result = func.apply(this, args);
  11040. memoized.cache = cache.set(key, result) || cache;
  11041. return result;
  11042. };
  11043. memoized.cache = new (memoize.Cache || MapCache);
  11044. return memoized;
  11045. }
  11046. // Expose `MapCache`.
  11047. memoize.Cache = MapCache;
  11048. /**
  11049. * Creates a function that negates the result of the predicate `func`. The
  11050. * `func` predicate is invoked with the `this` binding and arguments of the
  11051. * created function.
  11052. *
  11053. * @static
  11054. * @memberOf _
  11055. * @since 3.0.0
  11056. * @category Function
  11057. * @param {Function} predicate The predicate to negate.
  11058. * @returns {Function} Returns the new negated function.
  11059. * @example
  11060. *
  11061. * function isEven(n) {
  11062. * return n % 2 == 0;
  11063. * }
  11064. *
  11065. * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
  11066. * // => [1, 3, 5]
  11067. */
  11068. function negate(predicate) {
  11069. if (typeof predicate != 'function') {
  11070. throw new TypeError(FUNC_ERROR_TEXT);
  11071. }
  11072. return function() {
  11073. var args = arguments;
  11074. switch (args.length) {
  11075. case 0: return !predicate.call(this);
  11076. case 1: return !predicate.call(this, args[0]);
  11077. case 2: return !predicate.call(this, args[0], args[1]);
  11078. case 3: return !predicate.call(this, args[0], args[1], args[2]);
  11079. }
  11080. return !predicate.apply(this, args);
  11081. };
  11082. }
  11083. /**
  11084. * Creates a function that is restricted to invoking `func` once. Repeat calls
  11085. * to the function return the value of the first invocation. The `func` is
  11086. * invoked with the `this` binding and arguments of the created function.
  11087. *
  11088. * @static
  11089. * @memberOf _
  11090. * @since 0.1.0
  11091. * @category Function
  11092. * @param {Function} func The function to restrict.
  11093. * @returns {Function} Returns the new restricted function.
  11094. * @example
  11095. *
  11096. * var initialize = _.once(createApplication);
  11097. * initialize();
  11098. * initialize();
  11099. * // => `createApplication` is invoked once
  11100. */
  11101. function once(func) {
  11102. return before(2, func);
  11103. }
  11104. /**
  11105. * Creates a function that invokes `func` with its arguments transformed.
  11106. *
  11107. * @static
  11108. * @since 4.0.0
  11109. * @memberOf _
  11110. * @category Function
  11111. * @param {Function} func The function to wrap.
  11112. * @param {...(Function|Function[])} [transforms=[_.identity]]
  11113. * The argument transforms.
  11114. * @returns {Function} Returns the new function.
  11115. * @example
  11116. *
  11117. * function doubled(n) {
  11118. * return n * 2;
  11119. * }
  11120. *
  11121. * function square(n) {
  11122. * return n * n;
  11123. * }
  11124. *
  11125. * var func = _.overArgs(function(x, y) {
  11126. * return [x, y];
  11127. * }, [square, doubled]);
  11128. *
  11129. * func(9, 3);
  11130. * // => [81, 6]
  11131. *
  11132. * func(10, 5);
  11133. * // => [100, 10]
  11134. */
  11135. var overArgs = castRest(function(func, transforms) {
  11136. transforms = (transforms.length == 1 && isArray(transforms[0]))
  11137. ? arrayMap(transforms[0], baseUnary(getIteratee()))
  11138. : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));
  11139. var funcsLength = transforms.length;
  11140. return baseRest(function(args) {
  11141. var index = -1,
  11142. length = nativeMin(args.length, funcsLength);
  11143. while (++index < length) {
  11144. args[index] = transforms[index].call(this, args[index]);
  11145. }
  11146. return apply(func, this, args);
  11147. });
  11148. });
  11149. /**
  11150. * Creates a function that invokes `func` with `partials` prepended to the
  11151. * arguments it receives. This method is like `_.bind` except it does **not**
  11152. * alter the `this` binding.
  11153. *
  11154. * The `_.partial.placeholder` value, which defaults to `_` in monolithic
  11155. * builds, may be used as a placeholder for partially applied arguments.
  11156. *
  11157. * **Note:** This method doesn't set the "length" property of partially
  11158. * applied functions.
  11159. *
  11160. * @static
  11161. * @memberOf _
  11162. * @since 0.2.0
  11163. * @category Function
  11164. * @param {Function} func The function to partially apply arguments to.
  11165. * @param {...*} [partials] The arguments to be partially applied.
  11166. * @returns {Function} Returns the new partially applied function.
  11167. * @example
  11168. *
  11169. * function greet(greeting, name) {
  11170. * return greeting + ' ' + name;
  11171. * }
  11172. *
  11173. * var sayHelloTo = _.partial(greet, 'hello');
  11174. * sayHelloTo('fred');
  11175. * // => 'hello fred'
  11176. *
  11177. * // Partially applied with placeholders.
  11178. * var greetFred = _.partial(greet, _, 'fred');
  11179. * greetFred('hi');
  11180. * // => 'hi fred'
  11181. */
  11182. var partial = baseRest(function(func, partials) {
  11183. var holders = replaceHolders(partials, getHolder(partial));
  11184. return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
  11185. });
  11186. /**
  11187. * This method is like `_.partial` except that partially applied arguments
  11188. * are appended to the arguments it receives.
  11189. *
  11190. * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
  11191. * builds, may be used as a placeholder for partially applied arguments.
  11192. *
  11193. * **Note:** This method doesn't set the "length" property of partially
  11194. * applied functions.
  11195. *
  11196. * @static
  11197. * @memberOf _
  11198. * @since 1.0.0
  11199. * @category Function
  11200. * @param {Function} func The function to partially apply arguments to.
  11201. * @param {...*} [partials] The arguments to be partially applied.
  11202. * @returns {Function} Returns the new partially applied function.
  11203. * @example
  11204. *
  11205. * function greet(greeting, name) {
  11206. * return greeting + ' ' + name;
  11207. * }
  11208. *
  11209. * var greetFred = _.partialRight(greet, 'fred');
  11210. * greetFred('hi');
  11211. * // => 'hi fred'
  11212. *
  11213. * // Partially applied with placeholders.
  11214. * var sayHelloTo = _.partialRight(greet, 'hello', _);
  11215. * sayHelloTo('fred');
  11216. * // => 'hello fred'
  11217. */
  11218. var partialRight = baseRest(function(func, partials) {
  11219. var holders = replaceHolders(partials, getHolder(partialRight));
  11220. return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
  11221. });
  11222. /**
  11223. * Creates a function that invokes `func` with arguments arranged according
  11224. * to the specified `indexes` where the argument value at the first index is
  11225. * provided as the first argument, the argument value at the second index is
  11226. * provided as the second argument, and so on.
  11227. *
  11228. * @static
  11229. * @memberOf _
  11230. * @since 3.0.0
  11231. * @category Function
  11232. * @param {Function} func The function to rearrange arguments for.
  11233. * @param {...(number|number[])} indexes The arranged argument indexes.
  11234. * @returns {Function} Returns the new function.
  11235. * @example
  11236. *
  11237. * var rearged = _.rearg(function(a, b, c) {
  11238. * return [a, b, c];
  11239. * }, [2, 0, 1]);
  11240. *
  11241. * rearged('b', 'c', 'a')
  11242. * // => ['a', 'b', 'c']
  11243. */
  11244. var rearg = flatRest(function(func, indexes) {
  11245. return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
  11246. });
  11247. /**
  11248. * Creates a function that invokes `func` with the `this` binding of the
  11249. * created function and arguments from `start` and beyond provided as
  11250. * an array.
  11251. *
  11252. * **Note:** This method is based on the
  11253. * [rest parameter](https://mdn.io/rest_parameters).
  11254. *
  11255. * @static
  11256. * @memberOf _
  11257. * @since 4.0.0
  11258. * @category Function
  11259. * @param {Function} func The function to apply a rest parameter to.
  11260. * @param {number} [start=func.length-1] The start position of the rest parameter.
  11261. * @returns {Function} Returns the new function.
  11262. * @example
  11263. *
  11264. * var say = _.rest(function(what, names) {
  11265. * return what + ' ' + _.initial(names).join(', ') +
  11266. * (_.size(names) > 1 ? ', & ' : '') + _.last(names);
  11267. * });
  11268. *
  11269. * say('hello', 'fred', 'barney', 'pebbles');
  11270. * // => 'hello fred, barney, & pebbles'
  11271. */
  11272. function rest(func, start) {
  11273. if (typeof func != 'function') {
  11274. throw new TypeError(FUNC_ERROR_TEXT);
  11275. }
  11276. start = start === undefined ? start : toInteger(start);
  11277. return baseRest(func, start);
  11278. }
  11279. /**
  11280. * Creates a function that invokes `func` with the `this` binding of the
  11281. * create function and an array of arguments much like
  11282. * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
  11283. *
  11284. * **Note:** This method is based on the
  11285. * [spread operator](https://mdn.io/spread_operator).
  11286. *
  11287. * @static
  11288. * @memberOf _
  11289. * @since 3.2.0
  11290. * @category Function
  11291. * @param {Function} func The function to spread arguments over.
  11292. * @param {number} [start=0] The start position of the spread.
  11293. * @returns {Function} Returns the new function.
  11294. * @example
  11295. *
  11296. * var say = _.spread(function(who, what) {
  11297. * return who + ' says ' + what;
  11298. * });
  11299. *
  11300. * say(['fred', 'hello']);
  11301. * // => 'fred says hello'
  11302. *
  11303. * var numbers = Promise.all([
  11304. * Promise.resolve(40),
  11305. * Promise.resolve(36)
  11306. * ]);
  11307. *
  11308. * numbers.then(_.spread(function(x, y) {
  11309. * return x + y;
  11310. * }));
  11311. * // => a Promise of 76
  11312. */
  11313. function spread(func, start) {
  11314. if (typeof func != 'function') {
  11315. throw new TypeError(FUNC_ERROR_TEXT);
  11316. }
  11317. start = start == null ? 0 : nativeMax(toInteger(start), 0);
  11318. return baseRest(function(args) {
  11319. var array = args[start],
  11320. otherArgs = castSlice(args, 0, start);
  11321. if (array) {
  11322. arrayPush(otherArgs, array);
  11323. }
  11324. return apply(func, this, otherArgs);
  11325. });
  11326. }
  11327. /**
  11328. * Creates a throttled function that only invokes `func` at most once per
  11329. * every `wait` milliseconds. The throttled function comes with a `cancel`
  11330. * method to cancel delayed `func` invocations and a `flush` method to
  11331. * immediately invoke them. Provide `options` to indicate whether `func`
  11332. * should be invoked on the leading and/or trailing edge of the `wait`
  11333. * timeout. The `func` is invoked with the last arguments provided to the
  11334. * throttled function. Subsequent calls to the throttled function return the
  11335. * result of the last `func` invocation.
  11336. *
  11337. * **Note:** If `leading` and `trailing` options are `true`, `func` is
  11338. * invoked on the trailing edge of the timeout only if the throttled function
  11339. * is invoked more than once during the `wait` timeout.
  11340. *
  11341. * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
  11342. * until to the next tick, similar to `setTimeout` with a timeout of `0`.
  11343. *
  11344. * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
  11345. * for details over the differences between `_.throttle` and `_.debounce`.
  11346. *
  11347. * @static
  11348. * @memberOf _
  11349. * @since 0.1.0
  11350. * @category Function
  11351. * @param {Function} func The function to throttle.
  11352. * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
  11353. * @param {Object} [options={}] The options object.
  11354. * @param {boolean} [options.leading=true]
  11355. * Specify invoking on the leading edge of the timeout.
  11356. * @param {boolean} [options.trailing=true]
  11357. * Specify invoking on the trailing edge of the timeout.
  11358. * @returns {Function} Returns the new throttled function.
  11359. * @example
  11360. *
  11361. * // Avoid excessively updating the position while scrolling.
  11362. * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
  11363. *
  11364. * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
  11365. * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
  11366. * jQuery(element).on('click', throttled);
  11367. *
  11368. * // Cancel the trailing throttled invocation.
  11369. * jQuery(window).on('popstate', throttled.cancel);
  11370. */
  11371. function throttle(func, wait, options) {
  11372. var leading = true,
  11373. trailing = true;
  11374. if (typeof func != 'function') {
  11375. throw new TypeError(FUNC_ERROR_TEXT);
  11376. }
  11377. if (isObject(options)) {
  11378. leading = 'leading' in options ? !!options.leading : leading;
  11379. trailing = 'trailing' in options ? !!options.trailing : trailing;
  11380. }
  11381. return debounce(func, wait, {
  11382. 'leading': leading,
  11383. 'maxWait': wait,
  11384. 'trailing': trailing
  11385. });
  11386. }
  11387. /**
  11388. * Creates a function that accepts up to one argument, ignoring any
  11389. * additional arguments.
  11390. *
  11391. * @static
  11392. * @memberOf _
  11393. * @since 4.0.0
  11394. * @category Function
  11395. * @param {Function} func The function to cap arguments for.
  11396. * @returns {Function} Returns the new capped function.
  11397. * @example
  11398. *
  11399. * _.map(['6', '8', '10'], _.unary(parseInt));
  11400. * // => [6, 8, 10]
  11401. */
  11402. function unary(func) {
  11403. return ary(func, 1);
  11404. }
  11405. /**
  11406. * Creates a function that provides `value` to `wrapper` as its first
  11407. * argument. Any additional arguments provided to the function are appended
  11408. * to those provided to the `wrapper`. The wrapper is invoked with the `this`
  11409. * binding of the created function.
  11410. *
  11411. * @static
  11412. * @memberOf _
  11413. * @since 0.1.0
  11414. * @category Function
  11415. * @param {*} value The value to wrap.
  11416. * @param {Function} [wrapper=identity] The wrapper function.
  11417. * @returns {Function} Returns the new function.
  11418. * @example
  11419. *
  11420. * var p = _.wrap(_.escape, function(func, text) {
  11421. * return '<p>' + func(text) + '</p>';
  11422. * });
  11423. *
  11424. * p('fred, barney, & pebbles');
  11425. * // => '<p>fred, barney, &amp; pebbles</p>'
  11426. */
  11427. function wrap(value, wrapper) {
  11428. return partial(castFunction(wrapper), value);
  11429. }
  11430. /*------------------------------------------------------------------------*/
  11431. /**
  11432. * Casts `value` as an array if it's not one.
  11433. *
  11434. * @static
  11435. * @memberOf _
  11436. * @since 4.4.0
  11437. * @category Lang
  11438. * @param {*} value The value to inspect.
  11439. * @returns {Array} Returns the cast array.
  11440. * @example
  11441. *
  11442. * _.castArray(1);
  11443. * // => [1]
  11444. *
  11445. * _.castArray({ 'a': 1 });
  11446. * // => [{ 'a': 1 }]
  11447. *
  11448. * _.castArray('abc');
  11449. * // => ['abc']
  11450. *
  11451. * _.castArray(null);
  11452. * // => [null]
  11453. *
  11454. * _.castArray(undefined);
  11455. * // => [undefined]
  11456. *
  11457. * _.castArray();
  11458. * // => []
  11459. *
  11460. * var array = [1, 2, 3];
  11461. * console.log(_.castArray(array) === array);
  11462. * // => true
  11463. */
  11464. function castArray() {
  11465. if (!arguments.length) {
  11466. return [];
  11467. }
  11468. var value = arguments[0];
  11469. return isArray(value) ? value : [value];
  11470. }
  11471. /**
  11472. * Creates a shallow clone of `value`.
  11473. *
  11474. * **Note:** This method is loosely based on the
  11475. * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
  11476. * and supports cloning arrays, array buffers, booleans, date objects, maps,
  11477. * numbers, `Object` objects, regexes, sets, strings, symbols, and typed
  11478. * arrays. The own enumerable properties of `arguments` objects are cloned
  11479. * as plain objects. An empty object is returned for uncloneable values such
  11480. * as error objects, functions, DOM nodes, and WeakMaps.
  11481. *
  11482. * @static
  11483. * @memberOf _
  11484. * @since 0.1.0
  11485. * @category Lang
  11486. * @param {*} value The value to clone.
  11487. * @returns {*} Returns the cloned value.
  11488. * @see _.cloneDeep
  11489. * @example
  11490. *
  11491. * var objects = [{ 'a': 1 }, { 'b': 2 }];
  11492. *
  11493. * var shallow = _.clone(objects);
  11494. * console.log(shallow[0] === objects[0]);
  11495. * // => true
  11496. */
  11497. function clone(value) {
  11498. return baseClone(value, CLONE_SYMBOLS_FLAG);
  11499. }
  11500. /**
  11501. * This method is like `_.clone` except that it accepts `customizer` which
  11502. * is invoked to produce the cloned value. If `customizer` returns `undefined`,
  11503. * cloning is handled by the method instead. The `customizer` is invoked with
  11504. * up to four arguments; (value [, index|key, object, stack]).
  11505. *
  11506. * @static
  11507. * @memberOf _
  11508. * @since 4.0.0
  11509. * @category Lang
  11510. * @param {*} value The value to clone.
  11511. * @param {Function} [customizer] The function to customize cloning.
  11512. * @returns {*} Returns the cloned value.
  11513. * @see _.cloneDeepWith
  11514. * @example
  11515. *
  11516. * function customizer(value) {
  11517. * if (_.isElement(value)) {
  11518. * return value.cloneNode(false);
  11519. * }
  11520. * }
  11521. *
  11522. * var el = _.cloneWith(document.body, customizer);
  11523. *
  11524. * console.log(el === document.body);
  11525. * // => false
  11526. * console.log(el.nodeName);
  11527. * // => 'BODY'
  11528. * console.log(el.childNodes.length);
  11529. * // => 0
  11530. */
  11531. function cloneWith(value, customizer) {
  11532. customizer = typeof customizer == 'function' ? customizer : undefined;
  11533. return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);
  11534. }
  11535. /**
  11536. * This method is like `_.clone` except that it recursively clones `value`.
  11537. *
  11538. * @static
  11539. * @memberOf _
  11540. * @since 1.0.0
  11541. * @category Lang
  11542. * @param {*} value The value to recursively clone.
  11543. * @returns {*} Returns the deep cloned value.
  11544. * @see _.clone
  11545. * @example
  11546. *
  11547. * var objects = [{ 'a': 1 }, { 'b': 2 }];
  11548. *
  11549. * var deep = _.cloneDeep(objects);
  11550. * console.log(deep[0] === objects[0]);
  11551. * // => false
  11552. */
  11553. function cloneDeep(value) {
  11554. return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);
  11555. }
  11556. /**
  11557. * This method is like `_.cloneWith` except that it recursively clones `value`.
  11558. *
  11559. * @static
  11560. * @memberOf _
  11561. * @since 4.0.0
  11562. * @category Lang
  11563. * @param {*} value The value to recursively clone.
  11564. * @param {Function} [customizer] The function to customize cloning.
  11565. * @returns {*} Returns the deep cloned value.
  11566. * @see _.cloneWith
  11567. * @example
  11568. *
  11569. * function customizer(value) {
  11570. * if (_.isElement(value)) {
  11571. * return value.cloneNode(true);
  11572. * }
  11573. * }
  11574. *
  11575. * var el = _.cloneDeepWith(document.body, customizer);
  11576. *
  11577. * console.log(el === document.body);
  11578. * // => false
  11579. * console.log(el.nodeName);
  11580. * // => 'BODY'
  11581. * console.log(el.childNodes.length);
  11582. * // => 20
  11583. */
  11584. function cloneDeepWith(value, customizer) {
  11585. customizer = typeof customizer == 'function' ? customizer : undefined;
  11586. return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);
  11587. }
  11588. /**
  11589. * Checks if `object` conforms to `source` by invoking the predicate
  11590. * properties of `source` with the corresponding property values of `object`.
  11591. *
  11592. * **Note:** This method is equivalent to `_.conforms` when `source` is
  11593. * partially applied.
  11594. *
  11595. * @static
  11596. * @memberOf _
  11597. * @since 4.14.0
  11598. * @category Lang
  11599. * @param {Object} object The object to inspect.
  11600. * @param {Object} source The object of property predicates to conform to.
  11601. * @returns {boolean} Returns `true` if `object` conforms, else `false`.
  11602. * @example
  11603. *
  11604. * var object = { 'a': 1, 'b': 2 };
  11605. *
  11606. * _.conformsTo(object, { 'b': function(n) { return n > 1; } });
  11607. * // => true
  11608. *
  11609. * _.conformsTo(object, { 'b': function(n) { return n > 2; } });
  11610. * // => false
  11611. */
  11612. function conformsTo(object, source) {
  11613. return source == null || baseConformsTo(object, source, keys(source));
  11614. }
  11615. /**
  11616. * Performs a
  11617. * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
  11618. * comparison between two values to determine if they are equivalent.
  11619. *
  11620. * @static
  11621. * @memberOf _
  11622. * @since 4.0.0
  11623. * @category Lang
  11624. * @param {*} value The value to compare.
  11625. * @param {*} other The other value to compare.
  11626. * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
  11627. * @example
  11628. *
  11629. * var object = { 'a': 1 };
  11630. * var other = { 'a': 1 };
  11631. *
  11632. * _.eq(object, object);
  11633. * // => true
  11634. *
  11635. * _.eq(object, other);
  11636. * // => false
  11637. *
  11638. * _.eq('a', 'a');
  11639. * // => true
  11640. *
  11641. * _.eq('a', Object('a'));
  11642. * // => false
  11643. *
  11644. * _.eq(NaN, NaN);
  11645. * // => true
  11646. */
  11647. function eq(value, other) {
  11648. return value === other || (value !== value && other !== other);
  11649. }
  11650. /**
  11651. * Checks if `value` is greater than `other`.
  11652. *
  11653. * @static
  11654. * @memberOf _
  11655. * @since 3.9.0
  11656. * @category Lang
  11657. * @param {*} value The value to compare.
  11658. * @param {*} other The other value to compare.
  11659. * @returns {boolean} Returns `true` if `value` is greater than `other`,
  11660. * else `false`.
  11661. * @see _.lt
  11662. * @example
  11663. *
  11664. * _.gt(3, 1);
  11665. * // => true
  11666. *
  11667. * _.gt(3, 3);
  11668. * // => false
  11669. *
  11670. * _.gt(1, 3);
  11671. * // => false
  11672. */
  11673. var gt = createRelationalOperation(baseGt);
  11674. /**
  11675. * Checks if `value` is greater than or equal to `other`.
  11676. *
  11677. * @static
  11678. * @memberOf _
  11679. * @since 3.9.0
  11680. * @category Lang
  11681. * @param {*} value The value to compare.
  11682. * @param {*} other The other value to compare.
  11683. * @returns {boolean} Returns `true` if `value` is greater than or equal to
  11684. * `other`, else `false`.
  11685. * @see _.lte
  11686. * @example
  11687. *
  11688. * _.gte(3, 1);
  11689. * // => true
  11690. *
  11691. * _.gte(3, 3);
  11692. * // => true
  11693. *
  11694. * _.gte(1, 3);
  11695. * // => false
  11696. */
  11697. var gte = createRelationalOperation(function(value, other) {
  11698. return value >= other;
  11699. });
  11700. /**
  11701. * Checks if `value` is likely an `arguments` object.
  11702. *
  11703. * @static
  11704. * @memberOf _
  11705. * @since 0.1.0
  11706. * @category Lang
  11707. * @param {*} value The value to check.
  11708. * @returns {boolean} Returns `true` if `value` is an `arguments` object,
  11709. * else `false`.
  11710. * @example
  11711. *
  11712. * _.isArguments(function() { return arguments; }());
  11713. * // => true
  11714. *
  11715. * _.isArguments([1, 2, 3]);
  11716. * // => false
  11717. */
  11718. var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
  11719. return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
  11720. !propertyIsEnumerable.call(value, 'callee');
  11721. };
  11722. /**
  11723. * Checks if `value` is classified as an `Array` object.
  11724. *
  11725. * @static
  11726. * @memberOf _
  11727. * @since 0.1.0
  11728. * @category Lang
  11729. * @param {*} value The value to check.
  11730. * @returns {boolean} Returns `true` if `value` is an array, else `false`.
  11731. * @example
  11732. *
  11733. * _.isArray([1, 2, 3]);
  11734. * // => true
  11735. *
  11736. * _.isArray(document.body.children);
  11737. * // => false
  11738. *
  11739. * _.isArray('abc');
  11740. * // => false
  11741. *
  11742. * _.isArray(_.noop);
  11743. * // => false
  11744. */
  11745. var isArray = Array.isArray;
  11746. /**
  11747. * Checks if `value` is classified as an `ArrayBuffer` object.
  11748. *
  11749. * @static
  11750. * @memberOf _
  11751. * @since 4.3.0
  11752. * @category Lang
  11753. * @param {*} value The value to check.
  11754. * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
  11755. * @example
  11756. *
  11757. * _.isArrayBuffer(new ArrayBuffer(2));
  11758. * // => true
  11759. *
  11760. * _.isArrayBuffer(new Array(2));
  11761. * // => false
  11762. */
  11763. var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;
  11764. /**
  11765. * Checks if `value` is array-like. A value is considered array-like if it's
  11766. * not a function and has a `value.length` that's an integer greater than or
  11767. * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
  11768. *
  11769. * @static
  11770. * @memberOf _
  11771. * @since 4.0.0
  11772. * @category Lang
  11773. * @param {*} value The value to check.
  11774. * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
  11775. * @example
  11776. *
  11777. * _.isArrayLike([1, 2, 3]);
  11778. * // => true
  11779. *
  11780. * _.isArrayLike(document.body.children);
  11781. * // => true
  11782. *
  11783. * _.isArrayLike('abc');
  11784. * // => true
  11785. *
  11786. * _.isArrayLike(_.noop);
  11787. * // => false
  11788. */
  11789. function isArrayLike(value) {
  11790. return value != null && isLength(value.length) && !isFunction(value);
  11791. }
  11792. /**
  11793. * This method is like `_.isArrayLike` except that it also checks if `value`
  11794. * is an object.
  11795. *
  11796. * @static
  11797. * @memberOf _
  11798. * @since 4.0.0
  11799. * @category Lang
  11800. * @param {*} value The value to check.
  11801. * @returns {boolean} Returns `true` if `value` is an array-like object,
  11802. * else `false`.
  11803. * @example
  11804. *
  11805. * _.isArrayLikeObject([1, 2, 3]);
  11806. * // => true
  11807. *
  11808. * _.isArrayLikeObject(document.body.children);
  11809. * // => true
  11810. *
  11811. * _.isArrayLikeObject('abc');
  11812. * // => false
  11813. *
  11814. * _.isArrayLikeObject(_.noop);
  11815. * // => false
  11816. */
  11817. function isArrayLikeObject(value) {
  11818. return isObjectLike(value) && isArrayLike(value);
  11819. }
  11820. /**
  11821. * Checks if `value` is classified as a boolean primitive or object.
  11822. *
  11823. * @static
  11824. * @memberOf _
  11825. * @since 0.1.0
  11826. * @category Lang
  11827. * @param {*} value The value to check.
  11828. * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
  11829. * @example
  11830. *
  11831. * _.isBoolean(false);
  11832. * // => true
  11833. *
  11834. * _.isBoolean(null);
  11835. * // => false
  11836. */
  11837. function isBoolean(value) {
  11838. return value === true || value === false ||
  11839. (isObjectLike(value) && baseGetTag(value) == boolTag);
  11840. }
  11841. /**
  11842. * Checks if `value` is a buffer.
  11843. *
  11844. * @static
  11845. * @memberOf _
  11846. * @since 4.3.0
  11847. * @category Lang
  11848. * @param {*} value The value to check.
  11849. * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
  11850. * @example
  11851. *
  11852. * _.isBuffer(new Buffer(2));
  11853. * // => true
  11854. *
  11855. * _.isBuffer(new Uint8Array(2));
  11856. * // => false
  11857. */
  11858. var isBuffer = nativeIsBuffer || stubFalse;
  11859. /**
  11860. * Checks if `value` is classified as a `Date` object.
  11861. *
  11862. * @static
  11863. * @memberOf _
  11864. * @since 0.1.0
  11865. * @category Lang
  11866. * @param {*} value The value to check.
  11867. * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
  11868. * @example
  11869. *
  11870. * _.isDate(new Date);
  11871. * // => true
  11872. *
  11873. * _.isDate('Mon April 23 2012');
  11874. * // => false
  11875. */
  11876. var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;
  11877. /**
  11878. * Checks if `value` is likely a DOM element.
  11879. *
  11880. * @static
  11881. * @memberOf _
  11882. * @since 0.1.0
  11883. * @category Lang
  11884. * @param {*} value The value to check.
  11885. * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
  11886. * @example
  11887. *
  11888. * _.isElement(document.body);
  11889. * // => true
  11890. *
  11891. * _.isElement('<body>');
  11892. * // => false
  11893. */
  11894. function isElement(value) {
  11895. return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);
  11896. }
  11897. /**
  11898. * Checks if `value` is an empty object, collection, map, or set.
  11899. *
  11900. * Objects are considered empty if they have no own enumerable string keyed
  11901. * properties.
  11902. *
  11903. * Array-like values such as `arguments` objects, arrays, buffers, strings, or
  11904. * jQuery-like collections are considered empty if they have a `length` of `0`.
  11905. * Similarly, maps and sets are considered empty if they have a `size` of `0`.
  11906. *
  11907. * @static
  11908. * @memberOf _
  11909. * @since 0.1.0
  11910. * @category Lang
  11911. * @param {*} value The value to check.
  11912. * @returns {boolean} Returns `true` if `value` is empty, else `false`.
  11913. * @example
  11914. *
  11915. * _.isEmpty(null);
  11916. * // => true
  11917. *
  11918. * _.isEmpty(true);
  11919. * // => true
  11920. *
  11921. * _.isEmpty(1);
  11922. * // => true
  11923. *
  11924. * _.isEmpty([1, 2, 3]);
  11925. * // => false
  11926. *
  11927. * _.isEmpty({ 'a': 1 });
  11928. * // => false
  11929. */
  11930. function isEmpty(value) {
  11931. if (value == null) {
  11932. return true;
  11933. }
  11934. if (isArrayLike(value) &&
  11935. (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
  11936. isBuffer(value) || isTypedArray(value) || isArguments(value))) {
  11937. return !value.length;
  11938. }
  11939. var tag = getTag(value);
  11940. if (tag == mapTag || tag == setTag) {
  11941. return !value.size;
  11942. }
  11943. if (isPrototype(value)) {
  11944. return !baseKeys(value).length;
  11945. }
  11946. for (var key in value) {
  11947. if (hasOwnProperty.call(value, key)) {
  11948. return false;
  11949. }
  11950. }
  11951. return true;
  11952. }
  11953. /**
  11954. * Performs a deep comparison between two values to determine if they are
  11955. * equivalent.
  11956. *
  11957. * **Note:** This method supports comparing arrays, array buffers, booleans,
  11958. * date objects, error objects, maps, numbers, `Object` objects, regexes,
  11959. * sets, strings, symbols, and typed arrays. `Object` objects are compared
  11960. * by their own, not inherited, enumerable properties. Functions and DOM
  11961. * nodes are compared by strict equality, i.e. `===`.
  11962. *
  11963. * @static
  11964. * @memberOf _
  11965. * @since 0.1.0
  11966. * @category Lang
  11967. * @param {*} value The value to compare.
  11968. * @param {*} other The other value to compare.
  11969. * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
  11970. * @example
  11971. *
  11972. * var object = { 'a': 1 };
  11973. * var other = { 'a': 1 };
  11974. *
  11975. * _.isEqual(object, other);
  11976. * // => true
  11977. *
  11978. * object === other;
  11979. * // => false
  11980. */
  11981. function isEqual(value, other) {
  11982. return baseIsEqual(value, other);
  11983. }
  11984. /**
  11985. * This method is like `_.isEqual` except that it accepts `customizer` which
  11986. * is invoked to compare values. If `customizer` returns `undefined`, comparisons
  11987. * are handled by the method instead. The `customizer` is invoked with up to
  11988. * six arguments: (objValue, othValue [, index|key, object, other, stack]).
  11989. *
  11990. * @static
  11991. * @memberOf _
  11992. * @since 4.0.0
  11993. * @category Lang
  11994. * @param {*} value The value to compare.
  11995. * @param {*} other The other value to compare.
  11996. * @param {Function} [customizer] The function to customize comparisons.
  11997. * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
  11998. * @example
  11999. *
  12000. * function isGreeting(value) {
  12001. * return /^h(?:i|ello)$/.test(value);
  12002. * }
  12003. *
  12004. * function customizer(objValue, othValue) {
  12005. * if (isGreeting(objValue) && isGreeting(othValue)) {
  12006. * return true;
  12007. * }
  12008. * }
  12009. *
  12010. * var array = ['hello', 'goodbye'];
  12011. * var other = ['hi', 'goodbye'];
  12012. *
  12013. * _.isEqualWith(array, other, customizer);
  12014. * // => true
  12015. */
  12016. function isEqualWith(value, other, customizer) {
  12017. customizer = typeof customizer == 'function' ? customizer : undefined;
  12018. var result = customizer ? customizer(value, other) : undefined;
  12019. return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
  12020. }
  12021. /**
  12022. * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
  12023. * `SyntaxError`, `TypeError`, or `URIError` object.
  12024. *
  12025. * @static
  12026. * @memberOf _
  12027. * @since 3.0.0
  12028. * @category Lang
  12029. * @param {*} value The value to check.
  12030. * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
  12031. * @example
  12032. *
  12033. * _.isError(new Error);
  12034. * // => true
  12035. *
  12036. * _.isError(Error);
  12037. * // => false
  12038. */
  12039. function isError(value) {
  12040. if (!isObjectLike(value)) {
  12041. return false;
  12042. }
  12043. var tag = baseGetTag(value);
  12044. return tag == errorTag || tag == domExcTag ||
  12045. (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));
  12046. }
  12047. /**
  12048. * Checks if `value` is a finite primitive number.
  12049. *
  12050. * **Note:** This method is based on
  12051. * [`Number.isFinite`](https://mdn.io/Number/isFinite).
  12052. *
  12053. * @static
  12054. * @memberOf _
  12055. * @since 0.1.0
  12056. * @category Lang
  12057. * @param {*} value The value to check.
  12058. * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
  12059. * @example
  12060. *
  12061. * _.isFinite(3);
  12062. * // => true
  12063. *
  12064. * _.isFinite(Number.MIN_VALUE);
  12065. * // => true
  12066. *
  12067. * _.isFinite(Infinity);
  12068. * // => false
  12069. *
  12070. * _.isFinite('3');
  12071. * // => false
  12072. */
  12073. function isFinite(value) {
  12074. return typeof value == 'number' && nativeIsFinite(value);
  12075. }
  12076. /**
  12077. * Checks if `value` is classified as a `Function` object.
  12078. *
  12079. * @static
  12080. * @memberOf _
  12081. * @since 0.1.0
  12082. * @category Lang
  12083. * @param {*} value The value to check.
  12084. * @returns {boolean} Returns `true` if `value` is a function, else `false`.
  12085. * @example
  12086. *
  12087. * _.isFunction(_);
  12088. * // => true
  12089. *
  12090. * _.isFunction(/abc/);
  12091. * // => false
  12092. */
  12093. function isFunction(value) {
  12094. if (!isObject(value)) {
  12095. return false;
  12096. }
  12097. // The use of `Object#toString` avoids issues with the `typeof` operator
  12098. // in Safari 9 which returns 'object' for typed arrays and other constructors.
  12099. var tag = baseGetTag(value);
  12100. return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
  12101. }
  12102. /**
  12103. * Checks if `value` is an integer.
  12104. *
  12105. * **Note:** This method is based on
  12106. * [`Number.isInteger`](https://mdn.io/Number/isInteger).
  12107. *
  12108. * @static
  12109. * @memberOf _
  12110. * @since 4.0.0
  12111. * @category Lang
  12112. * @param {*} value The value to check.
  12113. * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
  12114. * @example
  12115. *
  12116. * _.isInteger(3);
  12117. * // => true
  12118. *
  12119. * _.isInteger(Number.MIN_VALUE);
  12120. * // => false
  12121. *
  12122. * _.isInteger(Infinity);
  12123. * // => false
  12124. *
  12125. * _.isInteger('3');
  12126. * // => false
  12127. */
  12128. function isInteger(value) {
  12129. return typeof value == 'number' && value == toInteger(value);
  12130. }
  12131. /**
  12132. * Checks if `value` is a valid array-like length.
  12133. *
  12134. * **Note:** This method is loosely based on
  12135. * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
  12136. *
  12137. * @static
  12138. * @memberOf _
  12139. * @since 4.0.0
  12140. * @category Lang
  12141. * @param {*} value The value to check.
  12142. * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
  12143. * @example
  12144. *
  12145. * _.isLength(3);
  12146. * // => true
  12147. *
  12148. * _.isLength(Number.MIN_VALUE);
  12149. * // => false
  12150. *
  12151. * _.isLength(Infinity);
  12152. * // => false
  12153. *
  12154. * _.isLength('3');
  12155. * // => false
  12156. */
  12157. function isLength(value) {
  12158. return typeof value == 'number' &&
  12159. value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
  12160. }
  12161. /**
  12162. * Checks if `value` is the
  12163. * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
  12164. * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
  12165. *
  12166. * @static
  12167. * @memberOf _
  12168. * @since 0.1.0
  12169. * @category Lang
  12170. * @param {*} value The value to check.
  12171. * @returns {boolean} Returns `true` if `value` is an object, else `false`.
  12172. * @example
  12173. *
  12174. * _.isObject({});
  12175. * // => true
  12176. *
  12177. * _.isObject([1, 2, 3]);
  12178. * // => true
  12179. *
  12180. * _.isObject(_.noop);
  12181. * // => true
  12182. *
  12183. * _.isObject(null);
  12184. * // => false
  12185. */
  12186. function isObject(value) {
  12187. var type = typeof value;
  12188. return value != null && (type == 'object' || type == 'function');
  12189. }
  12190. /**
  12191. * Checks if `value` is object-like. A value is object-like if it's not `null`
  12192. * and has a `typeof` result of "object".
  12193. *
  12194. * @static
  12195. * @memberOf _
  12196. * @since 4.0.0
  12197. * @category Lang
  12198. * @param {*} value The value to check.
  12199. * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
  12200. * @example
  12201. *
  12202. * _.isObjectLike({});
  12203. * // => true
  12204. *
  12205. * _.isObjectLike([1, 2, 3]);
  12206. * // => true
  12207. *
  12208. * _.isObjectLike(_.noop);
  12209. * // => false
  12210. *
  12211. * _.isObjectLike(null);
  12212. * // => false
  12213. */
  12214. function isObjectLike(value) {
  12215. return value != null && typeof value == 'object';
  12216. }
  12217. /**
  12218. * Checks if `value` is classified as a `Map` object.
  12219. *
  12220. * @static
  12221. * @memberOf _
  12222. * @since 4.3.0
  12223. * @category Lang
  12224. * @param {*} value The value to check.
  12225. * @returns {boolean} Returns `true` if `value` is a map, else `false`.
  12226. * @example
  12227. *
  12228. * _.isMap(new Map);
  12229. * // => true
  12230. *
  12231. * _.isMap(new WeakMap);
  12232. * // => false
  12233. */
  12234. var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;
  12235. /**
  12236. * Performs a partial deep comparison between `object` and `source` to
  12237. * determine if `object` contains equivalent property values.
  12238. *
  12239. * **Note:** This method is equivalent to `_.matches` when `source` is
  12240. * partially applied.
  12241. *
  12242. * Partial comparisons will match empty array and empty object `source`
  12243. * values against any array or object value, respectively. See `_.isEqual`
  12244. * for a list of supported value comparisons.
  12245. *
  12246. * @static
  12247. * @memberOf _
  12248. * @since 3.0.0
  12249. * @category Lang
  12250. * @param {Object} object The object to inspect.
  12251. * @param {Object} source The object of property values to match.
  12252. * @returns {boolean} Returns `true` if `object` is a match, else `false`.
  12253. * @example
  12254. *
  12255. * var object = { 'a': 1, 'b': 2 };
  12256. *
  12257. * _.isMatch(object, { 'b': 2 });
  12258. * // => true
  12259. *
  12260. * _.isMatch(object, { 'b': 1 });
  12261. * // => false
  12262. */
  12263. function isMatch(object, source) {
  12264. return object === source || baseIsMatch(object, source, getMatchData(source));
  12265. }
  12266. /**
  12267. * This method is like `_.isMatch` except that it accepts `customizer` which
  12268. * is invoked to compare values. If `customizer` returns `undefined`, comparisons
  12269. * are handled by the method instead. The `customizer` is invoked with five
  12270. * arguments: (objValue, srcValue, index|key, object, source).
  12271. *
  12272. * @static
  12273. * @memberOf _
  12274. * @since 4.0.0
  12275. * @category Lang
  12276. * @param {Object} object The object to inspect.
  12277. * @param {Object} source The object of property values to match.
  12278. * @param {Function} [customizer] The function to customize comparisons.
  12279. * @returns {boolean} Returns `true` if `object` is a match, else `false`.
  12280. * @example
  12281. *
  12282. * function isGreeting(value) {
  12283. * return /^h(?:i|ello)$/.test(value);
  12284. * }
  12285. *
  12286. * function customizer(objValue, srcValue) {
  12287. * if (isGreeting(objValue) && isGreeting(srcValue)) {
  12288. * return true;
  12289. * }
  12290. * }
  12291. *
  12292. * var object = { 'greeting': 'hello' };
  12293. * var source = { 'greeting': 'hi' };
  12294. *
  12295. * _.isMatchWith(object, source, customizer);
  12296. * // => true
  12297. */
  12298. function isMatchWith(object, source, customizer) {
  12299. customizer = typeof customizer == 'function' ? customizer : undefined;
  12300. return baseIsMatch(object, source, getMatchData(source), customizer);
  12301. }
  12302. /**
  12303. * Checks if `value` is `NaN`.
  12304. *
  12305. * **Note:** This method is based on
  12306. * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
  12307. * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
  12308. * `undefined` and other non-number values.
  12309. *
  12310. * @static
  12311. * @memberOf _
  12312. * @since 0.1.0
  12313. * @category Lang
  12314. * @param {*} value The value to check.
  12315. * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
  12316. * @example
  12317. *
  12318. * _.isNaN(NaN);
  12319. * // => true
  12320. *
  12321. * _.isNaN(new Number(NaN));
  12322. * // => true
  12323. *
  12324. * isNaN(undefined);
  12325. * // => true
  12326. *
  12327. * _.isNaN(undefined);
  12328. * // => false
  12329. */
  12330. function isNaN(value) {
  12331. // An `NaN` primitive is the only value that is not equal to itself.
  12332. // Perform the `toStringTag` check first to avoid errors with some
  12333. // ActiveX objects in IE.
  12334. return isNumber(value) && value != +value;
  12335. }
  12336. /**
  12337. * Checks if `value` is a pristine native function.
  12338. *
  12339. * **Note:** This method can't reliably detect native functions in the presence
  12340. * of the core-js package because core-js circumvents this kind of detection.
  12341. * Despite multiple requests, the core-js maintainer has made it clear: any
  12342. * attempt to fix the detection will be obstructed. As a result, we're left
  12343. * with little choice but to throw an error. Unfortunately, this also affects
  12344. * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
  12345. * which rely on core-js.
  12346. *
  12347. * @static
  12348. * @memberOf _
  12349. * @since 3.0.0
  12350. * @category Lang
  12351. * @param {*} value The value to check.
  12352. * @returns {boolean} Returns `true` if `value` is a native function,
  12353. * else `false`.
  12354. * @example
  12355. *
  12356. * _.isNative(Array.prototype.push);
  12357. * // => true
  12358. *
  12359. * _.isNative(_);
  12360. * // => false
  12361. */
  12362. function isNative(value) {
  12363. if (isMaskable(value)) {
  12364. throw new Error(CORE_ERROR_TEXT);
  12365. }
  12366. return baseIsNative(value);
  12367. }
  12368. /**
  12369. * Checks if `value` is `null`.
  12370. *
  12371. * @static
  12372. * @memberOf _
  12373. * @since 0.1.0
  12374. * @category Lang
  12375. * @param {*} value The value to check.
  12376. * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
  12377. * @example
  12378. *
  12379. * _.isNull(null);
  12380. * // => true
  12381. *
  12382. * _.isNull(void 0);
  12383. * // => false
  12384. */
  12385. function isNull(value) {
  12386. return value === null;
  12387. }
  12388. /**
  12389. * Checks if `value` is `null` or `undefined`.
  12390. *
  12391. * @static
  12392. * @memberOf _
  12393. * @since 4.0.0
  12394. * @category Lang
  12395. * @param {*} value The value to check.
  12396. * @returns {boolean} Returns `true` if `value` is nullish, else `false`.
  12397. * @example
  12398. *
  12399. * _.isNil(null);
  12400. * // => true
  12401. *
  12402. * _.isNil(void 0);
  12403. * // => true
  12404. *
  12405. * _.isNil(NaN);
  12406. * // => false
  12407. */
  12408. function isNil(value) {
  12409. return value == null;
  12410. }
  12411. /**
  12412. * Checks if `value` is classified as a `Number` primitive or object.
  12413. *
  12414. * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
  12415. * classified as numbers, use the `_.isFinite` method.
  12416. *
  12417. * @static
  12418. * @memberOf _
  12419. * @since 0.1.0
  12420. * @category Lang
  12421. * @param {*} value The value to check.
  12422. * @returns {boolean} Returns `true` if `value` is a number, else `false`.
  12423. * @example
  12424. *
  12425. * _.isNumber(3);
  12426. * // => true
  12427. *
  12428. * _.isNumber(Number.MIN_VALUE);
  12429. * // => true
  12430. *
  12431. * _.isNumber(Infinity);
  12432. * // => true
  12433. *
  12434. * _.isNumber('3');
  12435. * // => false
  12436. */
  12437. function isNumber(value) {
  12438. return typeof value == 'number' ||
  12439. (isObjectLike(value) && baseGetTag(value) == numberTag);
  12440. }
  12441. /**
  12442. * Checks if `value` is a plain object, that is, an object created by the
  12443. * `Object` constructor or one with a `[[Prototype]]` of `null`.
  12444. *
  12445. * @static
  12446. * @memberOf _
  12447. * @since 0.8.0
  12448. * @category Lang
  12449. * @param {*} value The value to check.
  12450. * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
  12451. * @example
  12452. *
  12453. * function Foo() {
  12454. * this.a = 1;
  12455. * }
  12456. *
  12457. * _.isPlainObject(new Foo);
  12458. * // => false
  12459. *
  12460. * _.isPlainObject([1, 2, 3]);
  12461. * // => false
  12462. *
  12463. * _.isPlainObject({ 'x': 0, 'y': 0 });
  12464. * // => true
  12465. *
  12466. * _.isPlainObject(Object.create(null));
  12467. * // => true
  12468. */
  12469. function isPlainObject(value) {
  12470. if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
  12471. return false;
  12472. }
  12473. var proto = getPrototype(value);
  12474. if (proto === null) {
  12475. return true;
  12476. }
  12477. var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
  12478. return typeof Ctor == 'function' && Ctor instanceof Ctor &&
  12479. funcToString.call(Ctor) == objectCtorString;
  12480. }
  12481. /**
  12482. * Checks if `value` is classified as a `RegExp` object.
  12483. *
  12484. * @static
  12485. * @memberOf _
  12486. * @since 0.1.0
  12487. * @category Lang
  12488. * @param {*} value The value to check.
  12489. * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
  12490. * @example
  12491. *
  12492. * _.isRegExp(/abc/);
  12493. * // => true
  12494. *
  12495. * _.isRegExp('/abc/');
  12496. * // => false
  12497. */
  12498. var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;
  12499. /**
  12500. * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
  12501. * double precision number which isn't the result of a rounded unsafe integer.
  12502. *
  12503. * **Note:** This method is based on
  12504. * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
  12505. *
  12506. * @static
  12507. * @memberOf _
  12508. * @since 4.0.0
  12509. * @category Lang
  12510. * @param {*} value The value to check.
  12511. * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
  12512. * @example
  12513. *
  12514. * _.isSafeInteger(3);
  12515. * // => true
  12516. *
  12517. * _.isSafeInteger(Number.MIN_VALUE);
  12518. * // => false
  12519. *
  12520. * _.isSafeInteger(Infinity);
  12521. * // => false
  12522. *
  12523. * _.isSafeInteger('3');
  12524. * // => false
  12525. */
  12526. function isSafeInteger(value) {
  12527. return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
  12528. }
  12529. /**
  12530. * Checks if `value` is classified as a `Set` object.
  12531. *
  12532. * @static
  12533. * @memberOf _
  12534. * @since 4.3.0
  12535. * @category Lang
  12536. * @param {*} value The value to check.
  12537. * @returns {boolean} Returns `true` if `value` is a set, else `false`.
  12538. * @example
  12539. *
  12540. * _.isSet(new Set);
  12541. * // => true
  12542. *
  12543. * _.isSet(new WeakSet);
  12544. * // => false
  12545. */
  12546. var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;
  12547. /**
  12548. * Checks if `value` is classified as a `String` primitive or object.
  12549. *
  12550. * @static
  12551. * @since 0.1.0
  12552. * @memberOf _
  12553. * @category Lang
  12554. * @param {*} value The value to check.
  12555. * @returns {boolean} Returns `true` if `value` is a string, else `false`.
  12556. * @example
  12557. *
  12558. * _.isString('abc');
  12559. * // => true
  12560. *
  12561. * _.isString(1);
  12562. * // => false
  12563. */
  12564. function isString(value) {
  12565. return typeof value == 'string' ||
  12566. (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
  12567. }
  12568. /**
  12569. * Checks if `value` is classified as a `Symbol` primitive or object.
  12570. *
  12571. * @static
  12572. * @memberOf _
  12573. * @since 4.0.0
  12574. * @category Lang
  12575. * @param {*} value The value to check.
  12576. * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
  12577. * @example
  12578. *
  12579. * _.isSymbol(Symbol.iterator);
  12580. * // => true
  12581. *
  12582. * _.isSymbol('abc');
  12583. * // => false
  12584. */
  12585. function isSymbol(value) {
  12586. return typeof value == 'symbol' ||
  12587. (isObjectLike(value) && baseGetTag(value) == symbolTag);
  12588. }
  12589. /**
  12590. * Checks if `value` is classified as a typed array.
  12591. *
  12592. * @static
  12593. * @memberOf _
  12594. * @since 3.0.0
  12595. * @category Lang
  12596. * @param {*} value The value to check.
  12597. * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
  12598. * @example
  12599. *
  12600. * _.isTypedArray(new Uint8Array);
  12601. * // => true
  12602. *
  12603. * _.isTypedArray([]);
  12604. * // => false
  12605. */
  12606. var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;
  12607. /**
  12608. * Checks if `value` is `undefined`.
  12609. *
  12610. * @static
  12611. * @since 0.1.0
  12612. * @memberOf _
  12613. * @category Lang
  12614. * @param {*} value The value to check.
  12615. * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
  12616. * @example
  12617. *
  12618. * _.isUndefined(void 0);
  12619. * // => true
  12620. *
  12621. * _.isUndefined(null);
  12622. * // => false
  12623. */
  12624. function isUndefined(value) {
  12625. return value === undefined;
  12626. }
  12627. /**
  12628. * Checks if `value` is classified as a `WeakMap` object.
  12629. *
  12630. * @static
  12631. * @memberOf _
  12632. * @since 4.3.0
  12633. * @category Lang
  12634. * @param {*} value The value to check.
  12635. * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.
  12636. * @example
  12637. *
  12638. * _.isWeakMap(new WeakMap);
  12639. * // => true
  12640. *
  12641. * _.isWeakMap(new Map);
  12642. * // => false
  12643. */
  12644. function isWeakMap(value) {
  12645. return isObjectLike(value) && getTag(value) == weakMapTag;
  12646. }
  12647. /**
  12648. * Checks if `value` is classified as a `WeakSet` object.
  12649. *
  12650. * @static
  12651. * @memberOf _
  12652. * @since 4.3.0
  12653. * @category Lang
  12654. * @param {*} value The value to check.
  12655. * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.
  12656. * @example
  12657. *
  12658. * _.isWeakSet(new WeakSet);
  12659. * // => true
  12660. *
  12661. * _.isWeakSet(new Set);
  12662. * // => false
  12663. */
  12664. function isWeakSet(value) {
  12665. return isObjectLike(value) && baseGetTag(value) == weakSetTag;
  12666. }
  12667. /**
  12668. * Checks if `value` is less than `other`.
  12669. *
  12670. * @static
  12671. * @memberOf _
  12672. * @since 3.9.0
  12673. * @category Lang
  12674. * @param {*} value The value to compare.
  12675. * @param {*} other The other value to compare.
  12676. * @returns {boolean} Returns `true` if `value` is less than `other`,
  12677. * else `false`.
  12678. * @see _.gt
  12679. * @example
  12680. *
  12681. * _.lt(1, 3);
  12682. * // => true
  12683. *
  12684. * _.lt(3, 3);
  12685. * // => false
  12686. *
  12687. * _.lt(3, 1);
  12688. * // => false
  12689. */
  12690. var lt = createRelationalOperation(baseLt);
  12691. /**
  12692. * Checks if `value` is less than or equal to `other`.
  12693. *
  12694. * @static
  12695. * @memberOf _
  12696. * @since 3.9.0
  12697. * @category Lang
  12698. * @param {*} value The value to compare.
  12699. * @param {*} other The other value to compare.
  12700. * @returns {boolean} Returns `true` if `value` is less than or equal to
  12701. * `other`, else `false`.
  12702. * @see _.gte
  12703. * @example
  12704. *
  12705. * _.lte(1, 3);
  12706. * // => true
  12707. *
  12708. * _.lte(3, 3);
  12709. * // => true
  12710. *
  12711. * _.lte(3, 1);
  12712. * // => false
  12713. */
  12714. var lte = createRelationalOperation(function(value, other) {
  12715. return value <= other;
  12716. });
  12717. /**
  12718. * Converts `value` to an array.
  12719. *
  12720. * @static
  12721. * @since 0.1.0
  12722. * @memberOf _
  12723. * @category Lang
  12724. * @param {*} value The value to convert.
  12725. * @returns {Array} Returns the converted array.
  12726. * @example
  12727. *
  12728. * _.toArray({ 'a': 1, 'b': 2 });
  12729. * // => [1, 2]
  12730. *
  12731. * _.toArray('abc');
  12732. * // => ['a', 'b', 'c']
  12733. *
  12734. * _.toArray(1);
  12735. * // => []
  12736. *
  12737. * _.toArray(null);
  12738. * // => []
  12739. */
  12740. function toArray(value) {
  12741. if (!value) {
  12742. return [];
  12743. }
  12744. if (isArrayLike(value)) {
  12745. return isString(value) ? stringToArray(value) : copyArray(value);
  12746. }
  12747. if (symIterator && value[symIterator]) {
  12748. return iteratorToArray(value[symIterator]());
  12749. }
  12750. var tag = getTag(value),
  12751. func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);
  12752. return func(value);
  12753. }
  12754. /**
  12755. * Converts `value` to a finite number.
  12756. *
  12757. * @static
  12758. * @memberOf _
  12759. * @since 4.12.0
  12760. * @category Lang
  12761. * @param {*} value The value to convert.
  12762. * @returns {number} Returns the converted number.
  12763. * @example
  12764. *
  12765. * _.toFinite(3.2);
  12766. * // => 3.2
  12767. *
  12768. * _.toFinite(Number.MIN_VALUE);
  12769. * // => 5e-324
  12770. *
  12771. * _.toFinite(Infinity);
  12772. * // => 1.7976931348623157e+308
  12773. *
  12774. * _.toFinite('3.2');
  12775. * // => 3.2
  12776. */
  12777. function toFinite(value) {
  12778. if (!value) {
  12779. return value === 0 ? value : 0;
  12780. }
  12781. value = toNumber(value);
  12782. if (value === INFINITY || value === -INFINITY) {
  12783. var sign = (value < 0 ? -1 : 1);
  12784. return sign * MAX_INTEGER;
  12785. }
  12786. return value === value ? value : 0;
  12787. }
  12788. /**
  12789. * Converts `value` to an integer.
  12790. *
  12791. * **Note:** This method is loosely based on
  12792. * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
  12793. *
  12794. * @static
  12795. * @memberOf _
  12796. * @since 4.0.0
  12797. * @category Lang
  12798. * @param {*} value The value to convert.
  12799. * @returns {number} Returns the converted integer.
  12800. * @example
  12801. *
  12802. * _.toInteger(3.2);
  12803. * // => 3
  12804. *
  12805. * _.toInteger(Number.MIN_VALUE);
  12806. * // => 0
  12807. *
  12808. * _.toInteger(Infinity);
  12809. * // => 1.7976931348623157e+308
  12810. *
  12811. * _.toInteger('3.2');
  12812. * // => 3
  12813. */
  12814. function toInteger(value) {
  12815. var result = toFinite(value),
  12816. remainder = result % 1;
  12817. return result === result ? (remainder ? result - remainder : result) : 0;
  12818. }
  12819. /**
  12820. * Converts `value` to an integer suitable for use as the length of an
  12821. * array-like object.
  12822. *
  12823. * **Note:** This method is based on
  12824. * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
  12825. *
  12826. * @static
  12827. * @memberOf _
  12828. * @since 4.0.0
  12829. * @category Lang
  12830. * @param {*} value The value to convert.
  12831. * @returns {number} Returns the converted integer.
  12832. * @example
  12833. *
  12834. * _.toLength(3.2);
  12835. * // => 3
  12836. *
  12837. * _.toLength(Number.MIN_VALUE);
  12838. * // => 0
  12839. *
  12840. * _.toLength(Infinity);
  12841. * // => 4294967295
  12842. *
  12843. * _.toLength('3.2');
  12844. * // => 3
  12845. */
  12846. function toLength(value) {
  12847. return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
  12848. }
  12849. /**
  12850. * Converts `value` to a number.
  12851. *
  12852. * @static
  12853. * @memberOf _
  12854. * @since 4.0.0
  12855. * @category Lang
  12856. * @param {*} value The value to process.
  12857. * @returns {number} Returns the number.
  12858. * @example
  12859. *
  12860. * _.toNumber(3.2);
  12861. * // => 3.2
  12862. *
  12863. * _.toNumber(Number.MIN_VALUE);
  12864. * // => 5e-324
  12865. *
  12866. * _.toNumber(Infinity);
  12867. * // => Infinity
  12868. *
  12869. * _.toNumber('3.2');
  12870. * // => 3.2
  12871. */
  12872. function toNumber(value) {
  12873. if (typeof value == 'number') {
  12874. return value;
  12875. }
  12876. if (isSymbol(value)) {
  12877. return NAN;
  12878. }
  12879. if (isObject(value)) {
  12880. var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
  12881. value = isObject(other) ? (other + '') : other;
  12882. }
  12883. if (typeof value != 'string') {
  12884. return value === 0 ? value : +value;
  12885. }
  12886. value = value.replace(reTrim, '');
  12887. var isBinary = reIsBinary.test(value);
  12888. return (isBinary || reIsOctal.test(value))
  12889. ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
  12890. : (reIsBadHex.test(value) ? NAN : +value);
  12891. }
  12892. /**
  12893. * Converts `value` to a plain object flattening inherited enumerable string
  12894. * keyed properties of `value` to own properties of the plain object.
  12895. *
  12896. * @static
  12897. * @memberOf _
  12898. * @since 3.0.0
  12899. * @category Lang
  12900. * @param {*} value The value to convert.
  12901. * @returns {Object} Returns the converted plain object.
  12902. * @example
  12903. *
  12904. * function Foo() {
  12905. * this.b = 2;
  12906. * }
  12907. *
  12908. * Foo.prototype.c = 3;
  12909. *
  12910. * _.assign({ 'a': 1 }, new Foo);
  12911. * // => { 'a': 1, 'b': 2 }
  12912. *
  12913. * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
  12914. * // => { 'a': 1, 'b': 2, 'c': 3 }
  12915. */
  12916. function toPlainObject(value) {
  12917. return copyObject(value, keysIn(value));
  12918. }
  12919. /**
  12920. * Converts `value` to a safe integer. A safe integer can be compared and
  12921. * represented correctly.
  12922. *
  12923. * @static
  12924. * @memberOf _
  12925. * @since 4.0.0
  12926. * @category Lang
  12927. * @param {*} value The value to convert.
  12928. * @returns {number} Returns the converted integer.
  12929. * @example
  12930. *
  12931. * _.toSafeInteger(3.2);
  12932. * // => 3
  12933. *
  12934. * _.toSafeInteger(Number.MIN_VALUE);
  12935. * // => 0
  12936. *
  12937. * _.toSafeInteger(Infinity);
  12938. * // => 9007199254740991
  12939. *
  12940. * _.toSafeInteger('3.2');
  12941. * // => 3
  12942. */
  12943. function toSafeInteger(value) {
  12944. return value
  12945. ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
  12946. : (value === 0 ? value : 0);
  12947. }
  12948. /**
  12949. * Converts `value` to a string. An empty string is returned for `null`
  12950. * and `undefined` values. The sign of `-0` is preserved.
  12951. *
  12952. * @static
  12953. * @memberOf _
  12954. * @since 4.0.0
  12955. * @category Lang
  12956. * @param {*} value The value to convert.
  12957. * @returns {string} Returns the converted string.
  12958. * @example
  12959. *
  12960. * _.toString(null);
  12961. * // => ''
  12962. *
  12963. * _.toString(-0);
  12964. * // => '-0'
  12965. *
  12966. * _.toString([1, 2, 3]);
  12967. * // => '1,2,3'
  12968. */
  12969. function toString(value) {
  12970. return value == null ? '' : baseToString(value);
  12971. }
  12972. /*------------------------------------------------------------------------*/
  12973. /**
  12974. * Assigns own enumerable string keyed properties of source objects to the
  12975. * destination object. Source objects are applied from left to right.
  12976. * Subsequent sources overwrite property assignments of previous sources.
  12977. *
  12978. * **Note:** This method mutates `object` and is loosely based on
  12979. * [`Object.assign`](https://mdn.io/Object/assign).
  12980. *
  12981. * @static
  12982. * @memberOf _
  12983. * @since 0.10.0
  12984. * @category Object
  12985. * @param {Object} object The destination object.
  12986. * @param {...Object} [sources] The source objects.
  12987. * @returns {Object} Returns `object`.
  12988. * @see _.assignIn
  12989. * @example
  12990. *
  12991. * function Foo() {
  12992. * this.a = 1;
  12993. * }
  12994. *
  12995. * function Bar() {
  12996. * this.c = 3;
  12997. * }
  12998. *
  12999. * Foo.prototype.b = 2;
  13000. * Bar.prototype.d = 4;
  13001. *
  13002. * _.assign({ 'a': 0 }, new Foo, new Bar);
  13003. * // => { 'a': 1, 'c': 3 }
  13004. */
  13005. var assign = createAssigner(function(object, source) {
  13006. if (isPrototype(source) || isArrayLike(source)) {
  13007. copyObject(source, keys(source), object);
  13008. return;
  13009. }
  13010. for (var key in source) {
  13011. if (hasOwnProperty.call(source, key)) {
  13012. assignValue(object, key, source[key]);
  13013. }
  13014. }
  13015. });
  13016. /**
  13017. * This method is like `_.assign` except that it iterates over own and
  13018. * inherited source properties.
  13019. *
  13020. * **Note:** This method mutates `object`.
  13021. *
  13022. * @static
  13023. * @memberOf _
  13024. * @since 4.0.0
  13025. * @alias extend
  13026. * @category Object
  13027. * @param {Object} object The destination object.
  13028. * @param {...Object} [sources] The source objects.
  13029. * @returns {Object} Returns `object`.
  13030. * @see _.assign
  13031. * @example
  13032. *
  13033. * function Foo() {
  13034. * this.a = 1;
  13035. * }
  13036. *
  13037. * function Bar() {
  13038. * this.c = 3;
  13039. * }
  13040. *
  13041. * Foo.prototype.b = 2;
  13042. * Bar.prototype.d = 4;
  13043. *
  13044. * _.assignIn({ 'a': 0 }, new Foo, new Bar);
  13045. * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
  13046. */
  13047. var assignIn = createAssigner(function(object, source) {
  13048. copyObject(source, keysIn(source), object);
  13049. });
  13050. /**
  13051. * This method is like `_.assignIn` except that it accepts `customizer`
  13052. * which is invoked to produce the assigned values. If `customizer` returns
  13053. * `undefined`, assignment is handled by the method instead. The `customizer`
  13054. * is invoked with five arguments: (objValue, srcValue, key, object, source).
  13055. *
  13056. * **Note:** This method mutates `object`.
  13057. *
  13058. * @static
  13059. * @memberOf _
  13060. * @since 4.0.0
  13061. * @alias extendWith
  13062. * @category Object
  13063. * @param {Object} object The destination object.
  13064. * @param {...Object} sources The source objects.
  13065. * @param {Function} [customizer] The function to customize assigned values.
  13066. * @returns {Object} Returns `object`.
  13067. * @see _.assignWith
  13068. * @example
  13069. *
  13070. * function customizer(objValue, srcValue) {
  13071. * return _.isUndefined(objValue) ? srcValue : objValue;
  13072. * }
  13073. *
  13074. * var defaults = _.partialRight(_.assignInWith, customizer);
  13075. *
  13076. * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
  13077. * // => { 'a': 1, 'b': 2 }
  13078. */
  13079. var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
  13080. copyObject(source, keysIn(source), object, customizer);
  13081. });
  13082. /**
  13083. * This method is like `_.assign` except that it accepts `customizer`
  13084. * which is invoked to produce the assigned values. If `customizer` returns
  13085. * `undefined`, assignment is handled by the method instead. The `customizer`
  13086. * is invoked with five arguments: (objValue, srcValue, key, object, source).
  13087. *
  13088. * **Note:** This method mutates `object`.
  13089. *
  13090. * @static
  13091. * @memberOf _
  13092. * @since 4.0.0
  13093. * @category Object
  13094. * @param {Object} object The destination object.
  13095. * @param {...Object} sources The source objects.
  13096. * @param {Function} [customizer] The function to customize assigned values.
  13097. * @returns {Object} Returns `object`.
  13098. * @see _.assignInWith
  13099. * @example
  13100. *
  13101. * function customizer(objValue, srcValue) {
  13102. * return _.isUndefined(objValue) ? srcValue : objValue;
  13103. * }
  13104. *
  13105. * var defaults = _.partialRight(_.assignWith, customizer);
  13106. *
  13107. * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
  13108. * // => { 'a': 1, 'b': 2 }
  13109. */
  13110. var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
  13111. copyObject(source, keys(source), object, customizer);
  13112. });
  13113. /**
  13114. * Creates an array of values corresponding to `paths` of `object`.
  13115. *
  13116. * @static
  13117. * @memberOf _
  13118. * @since 1.0.0
  13119. * @category Object
  13120. * @param {Object} object The object to iterate over.
  13121. * @param {...(string|string[])} [paths] The property paths to pick.
  13122. * @returns {Array} Returns the picked values.
  13123. * @example
  13124. *
  13125. * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
  13126. *
  13127. * _.at(object, ['a[0].b.c', 'a[1]']);
  13128. * // => [3, 4]
  13129. */
  13130. var at = flatRest(baseAt);
  13131. /**
  13132. * Creates an object that inherits from the `prototype` object. If a
  13133. * `properties` object is given, its own enumerable string keyed properties
  13134. * are assigned to the created object.
  13135. *
  13136. * @static
  13137. * @memberOf _
  13138. * @since 2.3.0
  13139. * @category Object
  13140. * @param {Object} prototype The object to inherit from.
  13141. * @param {Object} [properties] The properties to assign to the object.
  13142. * @returns {Object} Returns the new object.
  13143. * @example
  13144. *
  13145. * function Shape() {
  13146. * this.x = 0;
  13147. * this.y = 0;
  13148. * }
  13149. *
  13150. * function Circle() {
  13151. * Shape.call(this);
  13152. * }
  13153. *
  13154. * Circle.prototype = _.create(Shape.prototype, {
  13155. * 'constructor': Circle
  13156. * });
  13157. *
  13158. * var circle = new Circle;
  13159. * circle instanceof Circle;
  13160. * // => true
  13161. *
  13162. * circle instanceof Shape;
  13163. * // => true
  13164. */
  13165. function create(prototype, properties) {
  13166. var result = baseCreate(prototype);
  13167. return properties == null ? result : baseAssign(result, properties);
  13168. }
  13169. /**
  13170. * Assigns own and inherited enumerable string keyed properties of source
  13171. * objects to the destination object for all destination properties that
  13172. * resolve to `undefined`. Source objects are applied from left to right.
  13173. * Once a property is set, additional values of the same property are ignored.
  13174. *
  13175. * **Note:** This method mutates `object`.
  13176. *
  13177. * @static
  13178. * @since 0.1.0
  13179. * @memberOf _
  13180. * @category Object
  13181. * @param {Object} object The destination object.
  13182. * @param {...Object} [sources] The source objects.
  13183. * @returns {Object} Returns `object`.
  13184. * @see _.defaultsDeep
  13185. * @example
  13186. *
  13187. * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
  13188. * // => { 'a': 1, 'b': 2 }
  13189. */
  13190. var defaults = baseRest(function(object, sources) {
  13191. object = Object(object);
  13192. var index = -1;
  13193. var length = sources.length;
  13194. var guard = length > 2 ? sources[2] : undefined;
  13195. if (guard && isIterateeCall(sources[0], sources[1], guard)) {
  13196. length = 1;
  13197. }
  13198. while (++index < length) {
  13199. var source = sources[index];
  13200. var props = keysIn(source);
  13201. var propsIndex = -1;
  13202. var propsLength = props.length;
  13203. while (++propsIndex < propsLength) {
  13204. var key = props[propsIndex];
  13205. var value = object[key];
  13206. if (value === undefined ||
  13207. (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) {
  13208. object[key] = source[key];
  13209. }
  13210. }
  13211. }
  13212. return object;
  13213. });
  13214. /**
  13215. * This method is like `_.defaults` except that it recursively assigns
  13216. * default properties.
  13217. *
  13218. * **Note:** This method mutates `object`.
  13219. *
  13220. * @static
  13221. * @memberOf _
  13222. * @since 3.10.0
  13223. * @category Object
  13224. * @param {Object} object The destination object.
  13225. * @param {...Object} [sources] The source objects.
  13226. * @returns {Object} Returns `object`.
  13227. * @see _.defaults
  13228. * @example
  13229. *
  13230. * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
  13231. * // => { 'a': { 'b': 2, 'c': 3 } }
  13232. */
  13233. var defaultsDeep = baseRest(function(args) {
  13234. args.push(undefined, customDefaultsMerge);
  13235. return apply(mergeWith, undefined, args);
  13236. });
  13237. /**
  13238. * This method is like `_.find` except that it returns the key of the first
  13239. * element `predicate` returns truthy for instead of the element itself.
  13240. *
  13241. * @static
  13242. * @memberOf _
  13243. * @since 1.1.0
  13244. * @category Object
  13245. * @param {Object} object The object to inspect.
  13246. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  13247. * @returns {string|undefined} Returns the key of the matched element,
  13248. * else `undefined`.
  13249. * @example
  13250. *
  13251. * var users = {
  13252. * 'barney': { 'age': 36, 'active': true },
  13253. * 'fred': { 'age': 40, 'active': false },
  13254. * 'pebbles': { 'age': 1, 'active': true }
  13255. * };
  13256. *
  13257. * _.findKey(users, function(o) { return o.age < 40; });
  13258. * // => 'barney' (iteration order is not guaranteed)
  13259. *
  13260. * // The `_.matches` iteratee shorthand.
  13261. * _.findKey(users, { 'age': 1, 'active': true });
  13262. * // => 'pebbles'
  13263. *
  13264. * // The `_.matchesProperty` iteratee shorthand.
  13265. * _.findKey(users, ['active', false]);
  13266. * // => 'fred'
  13267. *
  13268. * // The `_.property` iteratee shorthand.
  13269. * _.findKey(users, 'active');
  13270. * // => 'barney'
  13271. */
  13272. function findKey(object, predicate) {
  13273. return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);
  13274. }
  13275. /**
  13276. * This method is like `_.findKey` except that it iterates over elements of
  13277. * a collection in the opposite order.
  13278. *
  13279. * @static
  13280. * @memberOf _
  13281. * @since 2.0.0
  13282. * @category Object
  13283. * @param {Object} object The object to inspect.
  13284. * @param {Function} [predicate=_.identity] The function invoked per iteration.
  13285. * @returns {string|undefined} Returns the key of the matched element,
  13286. * else `undefined`.
  13287. * @example
  13288. *
  13289. * var users = {
  13290. * 'barney': { 'age': 36, 'active': true },
  13291. * 'fred': { 'age': 40, 'active': false },
  13292. * 'pebbles': { 'age': 1, 'active': true }
  13293. * };
  13294. *
  13295. * _.findLastKey(users, function(o) { return o.age < 40; });
  13296. * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
  13297. *
  13298. * // The `_.matches` iteratee shorthand.
  13299. * _.findLastKey(users, { 'age': 36, 'active': true });
  13300. * // => 'barney'
  13301. *
  13302. * // The `_.matchesProperty` iteratee shorthand.
  13303. * _.findLastKey(users, ['active', false]);
  13304. * // => 'fred'
  13305. *
  13306. * // The `_.property` iteratee shorthand.
  13307. * _.findLastKey(users, 'active');
  13308. * // => 'pebbles'
  13309. */
  13310. function findLastKey(object, predicate) {
  13311. return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);
  13312. }
  13313. /**
  13314. * Iterates over own and inherited enumerable string keyed properties of an
  13315. * object and invokes `iteratee` for each property. The iteratee is invoked
  13316. * with three arguments: (value, key, object). Iteratee functions may exit
  13317. * iteration early by explicitly returning `false`.
  13318. *
  13319. * @static
  13320. * @memberOf _
  13321. * @since 0.3.0
  13322. * @category Object
  13323. * @param {Object} object The object to iterate over.
  13324. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  13325. * @returns {Object} Returns `object`.
  13326. * @see _.forInRight
  13327. * @example
  13328. *
  13329. * function Foo() {
  13330. * this.a = 1;
  13331. * this.b = 2;
  13332. * }
  13333. *
  13334. * Foo.prototype.c = 3;
  13335. *
  13336. * _.forIn(new Foo, function(value, key) {
  13337. * console.log(key);
  13338. * });
  13339. * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
  13340. */
  13341. function forIn(object, iteratee) {
  13342. return object == null
  13343. ? object
  13344. : baseFor(object, getIteratee(iteratee, 3), keysIn);
  13345. }
  13346. /**
  13347. * This method is like `_.forIn` except that it iterates over properties of
  13348. * `object` in the opposite order.
  13349. *
  13350. * @static
  13351. * @memberOf _
  13352. * @since 2.0.0
  13353. * @category Object
  13354. * @param {Object} object The object to iterate over.
  13355. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  13356. * @returns {Object} Returns `object`.
  13357. * @see _.forIn
  13358. * @example
  13359. *
  13360. * function Foo() {
  13361. * this.a = 1;
  13362. * this.b = 2;
  13363. * }
  13364. *
  13365. * Foo.prototype.c = 3;
  13366. *
  13367. * _.forInRight(new Foo, function(value, key) {
  13368. * console.log(key);
  13369. * });
  13370. * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.
  13371. */
  13372. function forInRight(object, iteratee) {
  13373. return object == null
  13374. ? object
  13375. : baseForRight(object, getIteratee(iteratee, 3), keysIn);
  13376. }
  13377. /**
  13378. * Iterates over own enumerable string keyed properties of an object and
  13379. * invokes `iteratee` for each property. The iteratee is invoked with three
  13380. * arguments: (value, key, object). Iteratee functions may exit iteration
  13381. * early by explicitly returning `false`.
  13382. *
  13383. * @static
  13384. * @memberOf _
  13385. * @since 0.3.0
  13386. * @category Object
  13387. * @param {Object} object The object to iterate over.
  13388. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  13389. * @returns {Object} Returns `object`.
  13390. * @see _.forOwnRight
  13391. * @example
  13392. *
  13393. * function Foo() {
  13394. * this.a = 1;
  13395. * this.b = 2;
  13396. * }
  13397. *
  13398. * Foo.prototype.c = 3;
  13399. *
  13400. * _.forOwn(new Foo, function(value, key) {
  13401. * console.log(key);
  13402. * });
  13403. * // => Logs 'a' then 'b' (iteration order is not guaranteed).
  13404. */
  13405. function forOwn(object, iteratee) {
  13406. return object && baseForOwn(object, getIteratee(iteratee, 3));
  13407. }
  13408. /**
  13409. * This method is like `_.forOwn` except that it iterates over properties of
  13410. * `object` in the opposite order.
  13411. *
  13412. * @static
  13413. * @memberOf _
  13414. * @since 2.0.0
  13415. * @category Object
  13416. * @param {Object} object The object to iterate over.
  13417. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  13418. * @returns {Object} Returns `object`.
  13419. * @see _.forOwn
  13420. * @example
  13421. *
  13422. * function Foo() {
  13423. * this.a = 1;
  13424. * this.b = 2;
  13425. * }
  13426. *
  13427. * Foo.prototype.c = 3;
  13428. *
  13429. * _.forOwnRight(new Foo, function(value, key) {
  13430. * console.log(key);
  13431. * });
  13432. * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.
  13433. */
  13434. function forOwnRight(object, iteratee) {
  13435. return object && baseForOwnRight(object, getIteratee(iteratee, 3));
  13436. }
  13437. /**
  13438. * Creates an array of function property names from own enumerable properties
  13439. * of `object`.
  13440. *
  13441. * @static
  13442. * @since 0.1.0
  13443. * @memberOf _
  13444. * @category Object
  13445. * @param {Object} object The object to inspect.
  13446. * @returns {Array} Returns the function names.
  13447. * @see _.functionsIn
  13448. * @example
  13449. *
  13450. * function Foo() {
  13451. * this.a = _.constant('a');
  13452. * this.b = _.constant('b');
  13453. * }
  13454. *
  13455. * Foo.prototype.c = _.constant('c');
  13456. *
  13457. * _.functions(new Foo);
  13458. * // => ['a', 'b']
  13459. */
  13460. function functions(object) {
  13461. return object == null ? [] : baseFunctions(object, keys(object));
  13462. }
  13463. /**
  13464. * Creates an array of function property names from own and inherited
  13465. * enumerable properties of `object`.
  13466. *
  13467. * @static
  13468. * @memberOf _
  13469. * @since 4.0.0
  13470. * @category Object
  13471. * @param {Object} object The object to inspect.
  13472. * @returns {Array} Returns the function names.
  13473. * @see _.functions
  13474. * @example
  13475. *
  13476. * function Foo() {
  13477. * this.a = _.constant('a');
  13478. * this.b = _.constant('b');
  13479. * }
  13480. *
  13481. * Foo.prototype.c = _.constant('c');
  13482. *
  13483. * _.functionsIn(new Foo);
  13484. * // => ['a', 'b', 'c']
  13485. */
  13486. function functionsIn(object) {
  13487. return object == null ? [] : baseFunctions(object, keysIn(object));
  13488. }
  13489. /**
  13490. * Gets the value at `path` of `object`. If the resolved value is
  13491. * `undefined`, the `defaultValue` is returned in its place.
  13492. *
  13493. * @static
  13494. * @memberOf _
  13495. * @since 3.7.0
  13496. * @category Object
  13497. * @param {Object} object The object to query.
  13498. * @param {Array|string} path The path of the property to get.
  13499. * @param {*} [defaultValue] The value returned for `undefined` resolved values.
  13500. * @returns {*} Returns the resolved value.
  13501. * @example
  13502. *
  13503. * var object = { 'a': [{ 'b': { 'c': 3 } }] };
  13504. *
  13505. * _.get(object, 'a[0].b.c');
  13506. * // => 3
  13507. *
  13508. * _.get(object, ['a', '0', 'b', 'c']);
  13509. * // => 3
  13510. *
  13511. * _.get(object, 'a.b.c', 'default');
  13512. * // => 'default'
  13513. */
  13514. function get(object, path, defaultValue) {
  13515. var result = object == null ? undefined : baseGet(object, path);
  13516. return result === undefined ? defaultValue : result;
  13517. }
  13518. /**
  13519. * Checks if `path` is a direct property of `object`.
  13520. *
  13521. * @static
  13522. * @since 0.1.0
  13523. * @memberOf _
  13524. * @category Object
  13525. * @param {Object} object The object to query.
  13526. * @param {Array|string} path The path to check.
  13527. * @returns {boolean} Returns `true` if `path` exists, else `false`.
  13528. * @example
  13529. *
  13530. * var object = { 'a': { 'b': 2 } };
  13531. * var other = _.create({ 'a': _.create({ 'b': 2 }) });
  13532. *
  13533. * _.has(object, 'a');
  13534. * // => true
  13535. *
  13536. * _.has(object, 'a.b');
  13537. * // => true
  13538. *
  13539. * _.has(object, ['a', 'b']);
  13540. * // => true
  13541. *
  13542. * _.has(other, 'a');
  13543. * // => false
  13544. */
  13545. function has(object, path) {
  13546. return object != null && hasPath(object, path, baseHas);
  13547. }
  13548. /**
  13549. * Checks if `path` is a direct or inherited property of `object`.
  13550. *
  13551. * @static
  13552. * @memberOf _
  13553. * @since 4.0.0
  13554. * @category Object
  13555. * @param {Object} object The object to query.
  13556. * @param {Array|string} path The path to check.
  13557. * @returns {boolean} Returns `true` if `path` exists, else `false`.
  13558. * @example
  13559. *
  13560. * var object = _.create({ 'a': _.create({ 'b': 2 }) });
  13561. *
  13562. * _.hasIn(object, 'a');
  13563. * // => true
  13564. *
  13565. * _.hasIn(object, 'a.b');
  13566. * // => true
  13567. *
  13568. * _.hasIn(object, ['a', 'b']);
  13569. * // => true
  13570. *
  13571. * _.hasIn(object, 'b');
  13572. * // => false
  13573. */
  13574. function hasIn(object, path) {
  13575. return object != null && hasPath(object, path, baseHasIn);
  13576. }
  13577. /**
  13578. * Creates an object composed of the inverted keys and values of `object`.
  13579. * If `object` contains duplicate values, subsequent values overwrite
  13580. * property assignments of previous values.
  13581. *
  13582. * @static
  13583. * @memberOf _
  13584. * @since 0.7.0
  13585. * @category Object
  13586. * @param {Object} object The object to invert.
  13587. * @returns {Object} Returns the new inverted object.
  13588. * @example
  13589. *
  13590. * var object = { 'a': 1, 'b': 2, 'c': 1 };
  13591. *
  13592. * _.invert(object);
  13593. * // => { '1': 'c', '2': 'b' }
  13594. */
  13595. var invert = createInverter(function(result, value, key) {
  13596. if (value != null &&
  13597. typeof value.toString != 'function') {
  13598. value = nativeObjectToString.call(value);
  13599. }
  13600. result[value] = key;
  13601. }, constant(identity));
  13602. /**
  13603. * This method is like `_.invert` except that the inverted object is generated
  13604. * from the results of running each element of `object` thru `iteratee`. The
  13605. * corresponding inverted value of each inverted key is an array of keys
  13606. * responsible for generating the inverted value. The iteratee is invoked
  13607. * with one argument: (value).
  13608. *
  13609. * @static
  13610. * @memberOf _
  13611. * @since 4.1.0
  13612. * @category Object
  13613. * @param {Object} object The object to invert.
  13614. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  13615. * @returns {Object} Returns the new inverted object.
  13616. * @example
  13617. *
  13618. * var object = { 'a': 1, 'b': 2, 'c': 1 };
  13619. *
  13620. * _.invertBy(object);
  13621. * // => { '1': ['a', 'c'], '2': ['b'] }
  13622. *
  13623. * _.invertBy(object, function(value) {
  13624. * return 'group' + value;
  13625. * });
  13626. * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
  13627. */
  13628. var invertBy = createInverter(function(result, value, key) {
  13629. if (value != null &&
  13630. typeof value.toString != 'function') {
  13631. value = nativeObjectToString.call(value);
  13632. }
  13633. if (hasOwnProperty.call(result, value)) {
  13634. result[value].push(key);
  13635. } else {
  13636. result[value] = [key];
  13637. }
  13638. }, getIteratee);
  13639. /**
  13640. * Invokes the method at `path` of `object`.
  13641. *
  13642. * @static
  13643. * @memberOf _
  13644. * @since 4.0.0
  13645. * @category Object
  13646. * @param {Object} object The object to query.
  13647. * @param {Array|string} path The path of the method to invoke.
  13648. * @param {...*} [args] The arguments to invoke the method with.
  13649. * @returns {*} Returns the result of the invoked method.
  13650. * @example
  13651. *
  13652. * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };
  13653. *
  13654. * _.invoke(object, 'a[0].b.c.slice', 1, 3);
  13655. * // => [2, 3]
  13656. */
  13657. var invoke = baseRest(baseInvoke);
  13658. /**
  13659. * Creates an array of the own enumerable property names of `object`.
  13660. *
  13661. * **Note:** Non-object values are coerced to objects. See the
  13662. * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
  13663. * for more details.
  13664. *
  13665. * @static
  13666. * @since 0.1.0
  13667. * @memberOf _
  13668. * @category Object
  13669. * @param {Object} object The object to query.
  13670. * @returns {Array} Returns the array of property names.
  13671. * @example
  13672. *
  13673. * function Foo() {
  13674. * this.a = 1;
  13675. * this.b = 2;
  13676. * }
  13677. *
  13678. * Foo.prototype.c = 3;
  13679. *
  13680. * _.keys(new Foo);
  13681. * // => ['a', 'b'] (iteration order is not guaranteed)
  13682. *
  13683. * _.keys('hi');
  13684. * // => ['0', '1']
  13685. */
  13686. function keys(object) {
  13687. return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
  13688. }
  13689. /**
  13690. * Creates an array of the own and inherited enumerable property names of `object`.
  13691. *
  13692. * **Note:** Non-object values are coerced to objects.
  13693. *
  13694. * @static
  13695. * @memberOf _
  13696. * @since 3.0.0
  13697. * @category Object
  13698. * @param {Object} object The object to query.
  13699. * @returns {Array} Returns the array of property names.
  13700. * @example
  13701. *
  13702. * function Foo() {
  13703. * this.a = 1;
  13704. * this.b = 2;
  13705. * }
  13706. *
  13707. * Foo.prototype.c = 3;
  13708. *
  13709. * _.keysIn(new Foo);
  13710. * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
  13711. */
  13712. function keysIn(object) {
  13713. return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
  13714. }
  13715. /**
  13716. * The opposite of `_.mapValues`; this method creates an object with the
  13717. * same values as `object` and keys generated by running each own enumerable
  13718. * string keyed property of `object` thru `iteratee`. The iteratee is invoked
  13719. * with three arguments: (value, key, object).
  13720. *
  13721. * @static
  13722. * @memberOf _
  13723. * @since 3.8.0
  13724. * @category Object
  13725. * @param {Object} object The object to iterate over.
  13726. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  13727. * @returns {Object} Returns the new mapped object.
  13728. * @see _.mapValues
  13729. * @example
  13730. *
  13731. * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
  13732. * return key + value;
  13733. * });
  13734. * // => { 'a1': 1, 'b2': 2 }
  13735. */
  13736. function mapKeys(object, iteratee) {
  13737. var result = {};
  13738. iteratee = getIteratee(iteratee, 3);
  13739. baseForOwn(object, function(value, key, object) {
  13740. baseAssignValue(result, iteratee(value, key, object), value);
  13741. });
  13742. return result;
  13743. }
  13744. /**
  13745. * Creates an object with the same keys as `object` and values generated
  13746. * by running each own enumerable string keyed property of `object` thru
  13747. * `iteratee`. The iteratee is invoked with three arguments:
  13748. * (value, key, object).
  13749. *
  13750. * @static
  13751. * @memberOf _
  13752. * @since 2.4.0
  13753. * @category Object
  13754. * @param {Object} object The object to iterate over.
  13755. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  13756. * @returns {Object} Returns the new mapped object.
  13757. * @see _.mapKeys
  13758. * @example
  13759. *
  13760. * var users = {
  13761. * 'fred': { 'user': 'fred', 'age': 40 },
  13762. * 'pebbles': { 'user': 'pebbles', 'age': 1 }
  13763. * };
  13764. *
  13765. * _.mapValues(users, function(o) { return o.age; });
  13766. * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
  13767. *
  13768. * // The `_.property` iteratee shorthand.
  13769. * _.mapValues(users, 'age');
  13770. * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
  13771. */
  13772. function mapValues(object, iteratee) {
  13773. var result = {};
  13774. iteratee = getIteratee(iteratee, 3);
  13775. baseForOwn(object, function(value, key, object) {
  13776. baseAssignValue(result, key, iteratee(value, key, object));
  13777. });
  13778. return result;
  13779. }
  13780. /**
  13781. * This method is like `_.assign` except that it recursively merges own and
  13782. * inherited enumerable string keyed properties of source objects into the
  13783. * destination object. Source properties that resolve to `undefined` are
  13784. * skipped if a destination value exists. Array and plain object properties
  13785. * are merged recursively. Other objects and value types are overridden by
  13786. * assignment. Source objects are applied from left to right. Subsequent
  13787. * sources overwrite property assignments of previous sources.
  13788. *
  13789. * **Note:** This method mutates `object`.
  13790. *
  13791. * @static
  13792. * @memberOf _
  13793. * @since 0.5.0
  13794. * @category Object
  13795. * @param {Object} object The destination object.
  13796. * @param {...Object} [sources] The source objects.
  13797. * @returns {Object} Returns `object`.
  13798. * @example
  13799. *
  13800. * var object = {
  13801. * 'a': [{ 'b': 2 }, { 'd': 4 }]
  13802. * };
  13803. *
  13804. * var other = {
  13805. * 'a': [{ 'c': 3 }, { 'e': 5 }]
  13806. * };
  13807. *
  13808. * _.merge(object, other);
  13809. * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }
  13810. */
  13811. var merge = createAssigner(function(object, source, srcIndex) {
  13812. baseMerge(object, source, srcIndex);
  13813. });
  13814. /**
  13815. * This method is like `_.merge` except that it accepts `customizer` which
  13816. * is invoked to produce the merged values of the destination and source
  13817. * properties. If `customizer` returns `undefined`, merging is handled by the
  13818. * method instead. The `customizer` is invoked with six arguments:
  13819. * (objValue, srcValue, key, object, source, stack).
  13820. *
  13821. * **Note:** This method mutates `object`.
  13822. *
  13823. * @static
  13824. * @memberOf _
  13825. * @since 4.0.0
  13826. * @category Object
  13827. * @param {Object} object The destination object.
  13828. * @param {...Object} sources The source objects.
  13829. * @param {Function} customizer The function to customize assigned values.
  13830. * @returns {Object} Returns `object`.
  13831. * @example
  13832. *
  13833. * function customizer(objValue, srcValue) {
  13834. * if (_.isArray(objValue)) {
  13835. * return objValue.concat(srcValue);
  13836. * }
  13837. * }
  13838. *
  13839. * var object = { 'a': [1], 'b': [2] };
  13840. * var other = { 'a': [3], 'b': [4] };
  13841. *
  13842. * _.mergeWith(object, other, customizer);
  13843. * // => { 'a': [1, 3], 'b': [2, 4] }
  13844. */
  13845. var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
  13846. baseMerge(object, source, srcIndex, customizer);
  13847. });
  13848. /**
  13849. * The opposite of `_.pick`; this method creates an object composed of the
  13850. * own and inherited enumerable property paths of `object` that are not omitted.
  13851. *
  13852. * **Note:** This method is considerably slower than `_.pick`.
  13853. *
  13854. * @static
  13855. * @since 0.1.0
  13856. * @memberOf _
  13857. * @category Object
  13858. * @param {Object} object The source object.
  13859. * @param {...(string|string[])} [paths] The property paths to omit.
  13860. * @returns {Object} Returns the new object.
  13861. * @example
  13862. *
  13863. * var object = { 'a': 1, 'b': '2', 'c': 3 };
  13864. *
  13865. * _.omit(object, ['a', 'c']);
  13866. * // => { 'b': '2' }
  13867. */
  13868. var omit = flatRest(function(object, paths) {
  13869. var result = {};
  13870. if (object == null) {
  13871. return result;
  13872. }
  13873. var isDeep = false;
  13874. paths = arrayMap(paths, function(path) {
  13875. path = castPath(path, object);
  13876. isDeep || (isDeep = path.length > 1);
  13877. return path;
  13878. });
  13879. copyObject(object, getAllKeysIn(object), result);
  13880. if (isDeep) {
  13881. result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
  13882. }
  13883. var length = paths.length;
  13884. while (length--) {
  13885. baseUnset(result, paths[length]);
  13886. }
  13887. return result;
  13888. });
  13889. /**
  13890. * The opposite of `_.pickBy`; this method creates an object composed of
  13891. * the own and inherited enumerable string keyed properties of `object` that
  13892. * `predicate` doesn't return truthy for. The predicate is invoked with two
  13893. * arguments: (value, key).
  13894. *
  13895. * @static
  13896. * @memberOf _
  13897. * @since 4.0.0
  13898. * @category Object
  13899. * @param {Object} object The source object.
  13900. * @param {Function} [predicate=_.identity] The function invoked per property.
  13901. * @returns {Object} Returns the new object.
  13902. * @example
  13903. *
  13904. * var object = { 'a': 1, 'b': '2', 'c': 3 };
  13905. *
  13906. * _.omitBy(object, _.isNumber);
  13907. * // => { 'b': '2' }
  13908. */
  13909. function omitBy(object, predicate) {
  13910. return pickBy(object, negate(getIteratee(predicate)));
  13911. }
  13912. /**
  13913. * Creates an object composed of the picked `object` properties.
  13914. *
  13915. * @static
  13916. * @since 0.1.0
  13917. * @memberOf _
  13918. * @category Object
  13919. * @param {Object} object The source object.
  13920. * @param {...(string|string[])} [paths] The property paths to pick.
  13921. * @returns {Object} Returns the new object.
  13922. * @example
  13923. *
  13924. * var object = { 'a': 1, 'b': '2', 'c': 3 };
  13925. *
  13926. * _.pick(object, ['a', 'c']);
  13927. * // => { 'a': 1, 'c': 3 }
  13928. */
  13929. var pick = flatRest(function(object, paths) {
  13930. return object == null ? {} : basePick(object, paths);
  13931. });
  13932. /**
  13933. * Creates an object composed of the `object` properties `predicate` returns
  13934. * truthy for. The predicate is invoked with two arguments: (value, key).
  13935. *
  13936. * @static
  13937. * @memberOf _
  13938. * @since 4.0.0
  13939. * @category Object
  13940. * @param {Object} object The source object.
  13941. * @param {Function} [predicate=_.identity] The function invoked per property.
  13942. * @returns {Object} Returns the new object.
  13943. * @example
  13944. *
  13945. * var object = { 'a': 1, 'b': '2', 'c': 3 };
  13946. *
  13947. * _.pickBy(object, _.isNumber);
  13948. * // => { 'a': 1, 'c': 3 }
  13949. */
  13950. function pickBy(object, predicate) {
  13951. if (object == null) {
  13952. return {};
  13953. }
  13954. var props = arrayMap(getAllKeysIn(object), function(prop) {
  13955. return [prop];
  13956. });
  13957. predicate = getIteratee(predicate);
  13958. return basePickBy(object, props, function(value, path) {
  13959. return predicate(value, path[0]);
  13960. });
  13961. }
  13962. /**
  13963. * This method is like `_.get` except that if the resolved value is a
  13964. * function it's invoked with the `this` binding of its parent object and
  13965. * its result is returned.
  13966. *
  13967. * @static
  13968. * @since 0.1.0
  13969. * @memberOf _
  13970. * @category Object
  13971. * @param {Object} object The object to query.
  13972. * @param {Array|string} path The path of the property to resolve.
  13973. * @param {*} [defaultValue] The value returned for `undefined` resolved values.
  13974. * @returns {*} Returns the resolved value.
  13975. * @example
  13976. *
  13977. * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
  13978. *
  13979. * _.result(object, 'a[0].b.c1');
  13980. * // => 3
  13981. *
  13982. * _.result(object, 'a[0].b.c2');
  13983. * // => 4
  13984. *
  13985. * _.result(object, 'a[0].b.c3', 'default');
  13986. * // => 'default'
  13987. *
  13988. * _.result(object, 'a[0].b.c3', _.constant('default'));
  13989. * // => 'default'
  13990. */
  13991. function result(object, path, defaultValue) {
  13992. path = castPath(path, object);
  13993. var index = -1,
  13994. length = path.length;
  13995. // Ensure the loop is entered when path is empty.
  13996. if (!length) {
  13997. length = 1;
  13998. object = undefined;
  13999. }
  14000. while (++index < length) {
  14001. var value = object == null ? undefined : object[toKey(path[index])];
  14002. if (value === undefined) {
  14003. index = length;
  14004. value = defaultValue;
  14005. }
  14006. object = isFunction(value) ? value.call(object) : value;
  14007. }
  14008. return object;
  14009. }
  14010. /**
  14011. * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,
  14012. * it's created. Arrays are created for missing index properties while objects
  14013. * are created for all other missing properties. Use `_.setWith` to customize
  14014. * `path` creation.
  14015. *
  14016. * **Note:** This method mutates `object`.
  14017. *
  14018. * @static
  14019. * @memberOf _
  14020. * @since 3.7.0
  14021. * @category Object
  14022. * @param {Object} object The object to modify.
  14023. * @param {Array|string} path The path of the property to set.
  14024. * @param {*} value The value to set.
  14025. * @returns {Object} Returns `object`.
  14026. * @example
  14027. *
  14028. * var object = { 'a': [{ 'b': { 'c': 3 } }] };
  14029. *
  14030. * _.set(object, 'a[0].b.c', 4);
  14031. * console.log(object.a[0].b.c);
  14032. * // => 4
  14033. *
  14034. * _.set(object, ['x', '0', 'y', 'z'], 5);
  14035. * console.log(object.x[0].y.z);
  14036. * // => 5
  14037. */
  14038. function set(object, path, value) {
  14039. return object == null ? object : baseSet(object, path, value);
  14040. }
  14041. /**
  14042. * This method is like `_.set` except that it accepts `customizer` which is
  14043. * invoked to produce the objects of `path`. If `customizer` returns `undefined`
  14044. * path creation is handled by the method instead. The `customizer` is invoked
  14045. * with three arguments: (nsValue, key, nsObject).
  14046. *
  14047. * **Note:** This method mutates `object`.
  14048. *
  14049. * @static
  14050. * @memberOf _
  14051. * @since 4.0.0
  14052. * @category Object
  14053. * @param {Object} object The object to modify.
  14054. * @param {Array|string} path The path of the property to set.
  14055. * @param {*} value The value to set.
  14056. * @param {Function} [customizer] The function to customize assigned values.
  14057. * @returns {Object} Returns `object`.
  14058. * @example
  14059. *
  14060. * var object = {};
  14061. *
  14062. * _.setWith(object, '[0][1]', 'a', Object);
  14063. * // => { '0': { '1': 'a' } }
  14064. */
  14065. function setWith(object, path, value, customizer) {
  14066. customizer = typeof customizer == 'function' ? customizer : undefined;
  14067. return object == null ? object : baseSet(object, path, value, customizer);
  14068. }
  14069. /**
  14070. * Creates an array of own enumerable string keyed-value pairs for `object`
  14071. * which can be consumed by `_.fromPairs`. If `object` is a map or set, its
  14072. * entries are returned.
  14073. *
  14074. * @static
  14075. * @memberOf _
  14076. * @since 4.0.0
  14077. * @alias entries
  14078. * @category Object
  14079. * @param {Object} object The object to query.
  14080. * @returns {Array} Returns the key-value pairs.
  14081. * @example
  14082. *
  14083. * function Foo() {
  14084. * this.a = 1;
  14085. * this.b = 2;
  14086. * }
  14087. *
  14088. * Foo.prototype.c = 3;
  14089. *
  14090. * _.toPairs(new Foo);
  14091. * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
  14092. */
  14093. var toPairs = createToPairs(keys);
  14094. /**
  14095. * Creates an array of own and inherited enumerable string keyed-value pairs
  14096. * for `object` which can be consumed by `_.fromPairs`. If `object` is a map
  14097. * or set, its entries are returned.
  14098. *
  14099. * @static
  14100. * @memberOf _
  14101. * @since 4.0.0
  14102. * @alias entriesIn
  14103. * @category Object
  14104. * @param {Object} object The object to query.
  14105. * @returns {Array} Returns the key-value pairs.
  14106. * @example
  14107. *
  14108. * function Foo() {
  14109. * this.a = 1;
  14110. * this.b = 2;
  14111. * }
  14112. *
  14113. * Foo.prototype.c = 3;
  14114. *
  14115. * _.toPairsIn(new Foo);
  14116. * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)
  14117. */
  14118. var toPairsIn = createToPairs(keysIn);
  14119. /**
  14120. * An alternative to `_.reduce`; this method transforms `object` to a new
  14121. * `accumulator` object which is the result of running each of its own
  14122. * enumerable string keyed properties thru `iteratee`, with each invocation
  14123. * potentially mutating the `accumulator` object. If `accumulator` is not
  14124. * provided, a new object with the same `[[Prototype]]` will be used. The
  14125. * iteratee is invoked with four arguments: (accumulator, value, key, object).
  14126. * Iteratee functions may exit iteration early by explicitly returning `false`.
  14127. *
  14128. * @static
  14129. * @memberOf _
  14130. * @since 1.3.0
  14131. * @category Object
  14132. * @param {Object} object The object to iterate over.
  14133. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  14134. * @param {*} [accumulator] The custom accumulator value.
  14135. * @returns {*} Returns the accumulated value.
  14136. * @example
  14137. *
  14138. * _.transform([2, 3, 4], function(result, n) {
  14139. * result.push(n *= n);
  14140. * return n % 2 == 0;
  14141. * }, []);
  14142. * // => [4, 9]
  14143. *
  14144. * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
  14145. * (result[value] || (result[value] = [])).push(key);
  14146. * }, {});
  14147. * // => { '1': ['a', 'c'], '2': ['b'] }
  14148. */
  14149. function transform(object, iteratee, accumulator) {
  14150. var isArr = isArray(object),
  14151. isArrLike = isArr || isBuffer(object) || isTypedArray(object);
  14152. iteratee = getIteratee(iteratee, 4);
  14153. if (accumulator == null) {
  14154. var Ctor = object && object.constructor;
  14155. if (isArrLike) {
  14156. accumulator = isArr ? new Ctor : [];
  14157. }
  14158. else if (isObject(object)) {
  14159. accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
  14160. }
  14161. else {
  14162. accumulator = {};
  14163. }
  14164. }
  14165. (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
  14166. return iteratee(accumulator, value, index, object);
  14167. });
  14168. return accumulator;
  14169. }
  14170. /**
  14171. * Removes the property at `path` of `object`.
  14172. *
  14173. * **Note:** This method mutates `object`.
  14174. *
  14175. * @static
  14176. * @memberOf _
  14177. * @since 4.0.0
  14178. * @category Object
  14179. * @param {Object} object The object to modify.
  14180. * @param {Array|string} path The path of the property to unset.
  14181. * @returns {boolean} Returns `true` if the property is deleted, else `false`.
  14182. * @example
  14183. *
  14184. * var object = { 'a': [{ 'b': { 'c': 7 } }] };
  14185. * _.unset(object, 'a[0].b.c');
  14186. * // => true
  14187. *
  14188. * console.log(object);
  14189. * // => { 'a': [{ 'b': {} }] };
  14190. *
  14191. * _.unset(object, ['a', '0', 'b', 'c']);
  14192. * // => true
  14193. *
  14194. * console.log(object);
  14195. * // => { 'a': [{ 'b': {} }] };
  14196. */
  14197. function unset(object, path) {
  14198. return object == null ? true : baseUnset(object, path);
  14199. }
  14200. /**
  14201. * This method is like `_.set` except that accepts `updater` to produce the
  14202. * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
  14203. * is invoked with one argument: (value).
  14204. *
  14205. * **Note:** This method mutates `object`.
  14206. *
  14207. * @static
  14208. * @memberOf _
  14209. * @since 4.6.0
  14210. * @category Object
  14211. * @param {Object} object The object to modify.
  14212. * @param {Array|string} path The path of the property to set.
  14213. * @param {Function} updater The function to produce the updated value.
  14214. * @returns {Object} Returns `object`.
  14215. * @example
  14216. *
  14217. * var object = { 'a': [{ 'b': { 'c': 3 } }] };
  14218. *
  14219. * _.update(object, 'a[0].b.c', function(n) { return n * n; });
  14220. * console.log(object.a[0].b.c);
  14221. * // => 9
  14222. *
  14223. * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
  14224. * console.log(object.x[0].y.z);
  14225. * // => 0
  14226. */
  14227. function update(object, path, updater) {
  14228. return object == null ? object : baseUpdate(object, path, castFunction(updater));
  14229. }
  14230. /**
  14231. * This method is like `_.update` except that it accepts `customizer` which is
  14232. * invoked to produce the objects of `path`. If `customizer` returns `undefined`
  14233. * path creation is handled by the method instead. The `customizer` is invoked
  14234. * with three arguments: (nsValue, key, nsObject).
  14235. *
  14236. * **Note:** This method mutates `object`.
  14237. *
  14238. * @static
  14239. * @memberOf _
  14240. * @since 4.6.0
  14241. * @category Object
  14242. * @param {Object} object The object to modify.
  14243. * @param {Array|string} path The path of the property to set.
  14244. * @param {Function} updater The function to produce the updated value.
  14245. * @param {Function} [customizer] The function to customize assigned values.
  14246. * @returns {Object} Returns `object`.
  14247. * @example
  14248. *
  14249. * var object = {};
  14250. *
  14251. * _.updateWith(object, '[0][1]', _.constant('a'), Object);
  14252. * // => { '0': { '1': 'a' } }
  14253. */
  14254. function updateWith(object, path, updater, customizer) {
  14255. customizer = typeof customizer == 'function' ? customizer : undefined;
  14256. return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);
  14257. }
  14258. /**
  14259. * Creates an array of the own enumerable string keyed property values of `object`.
  14260. *
  14261. * **Note:** Non-object values are coerced to objects.
  14262. *
  14263. * @static
  14264. * @since 0.1.0
  14265. * @memberOf _
  14266. * @category Object
  14267. * @param {Object} object The object to query.
  14268. * @returns {Array} Returns the array of property values.
  14269. * @example
  14270. *
  14271. * function Foo() {
  14272. * this.a = 1;
  14273. * this.b = 2;
  14274. * }
  14275. *
  14276. * Foo.prototype.c = 3;
  14277. *
  14278. * _.values(new Foo);
  14279. * // => [1, 2] (iteration order is not guaranteed)
  14280. *
  14281. * _.values('hi');
  14282. * // => ['h', 'i']
  14283. */
  14284. function values(object) {
  14285. return object == null ? [] : baseValues(object, keys(object));
  14286. }
  14287. /**
  14288. * Creates an array of the own and inherited enumerable string keyed property
  14289. * values of `object`.
  14290. *
  14291. * **Note:** Non-object values are coerced to objects.
  14292. *
  14293. * @static
  14294. * @memberOf _
  14295. * @since 3.0.0
  14296. * @category Object
  14297. * @param {Object} object The object to query.
  14298. * @returns {Array} Returns the array of property values.
  14299. * @example
  14300. *
  14301. * function Foo() {
  14302. * this.a = 1;
  14303. * this.b = 2;
  14304. * }
  14305. *
  14306. * Foo.prototype.c = 3;
  14307. *
  14308. * _.valuesIn(new Foo);
  14309. * // => [1, 2, 3] (iteration order is not guaranteed)
  14310. */
  14311. function valuesIn(object) {
  14312. return object == null ? [] : baseValues(object, keysIn(object));
  14313. }
  14314. /*------------------------------------------------------------------------*/
  14315. /**
  14316. * Clamps `number` within the inclusive `lower` and `upper` bounds.
  14317. *
  14318. * @static
  14319. * @memberOf _
  14320. * @since 4.0.0
  14321. * @category Number
  14322. * @param {number} number The number to clamp.
  14323. * @param {number} [lower] The lower bound.
  14324. * @param {number} upper The upper bound.
  14325. * @returns {number} Returns the clamped number.
  14326. * @example
  14327. *
  14328. * _.clamp(-10, -5, 5);
  14329. * // => -5
  14330. *
  14331. * _.clamp(10, -5, 5);
  14332. * // => 5
  14333. */
  14334. function clamp(number, lower, upper) {
  14335. if (upper === undefined) {
  14336. upper = lower;
  14337. lower = undefined;
  14338. }
  14339. if (upper !== undefined) {
  14340. upper = toNumber(upper);
  14341. upper = upper === upper ? upper : 0;
  14342. }
  14343. if (lower !== undefined) {
  14344. lower = toNumber(lower);
  14345. lower = lower === lower ? lower : 0;
  14346. }
  14347. return baseClamp(toNumber(number), lower, upper);
  14348. }
  14349. /**
  14350. * Checks if `n` is between `start` and up to, but not including, `end`. If
  14351. * `end` is not specified, it's set to `start` with `start` then set to `0`.
  14352. * If `start` is greater than `end` the params are swapped to support
  14353. * negative ranges.
  14354. *
  14355. * @static
  14356. * @memberOf _
  14357. * @since 3.3.0
  14358. * @category Number
  14359. * @param {number} number The number to check.
  14360. * @param {number} [start=0] The start of the range.
  14361. * @param {number} end The end of the range.
  14362. * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
  14363. * @see _.range, _.rangeRight
  14364. * @example
  14365. *
  14366. * _.inRange(3, 2, 4);
  14367. * // => true
  14368. *
  14369. * _.inRange(4, 8);
  14370. * // => true
  14371. *
  14372. * _.inRange(4, 2);
  14373. * // => false
  14374. *
  14375. * _.inRange(2, 2);
  14376. * // => false
  14377. *
  14378. * _.inRange(1.2, 2);
  14379. * // => true
  14380. *
  14381. * _.inRange(5.2, 4);
  14382. * // => false
  14383. *
  14384. * _.inRange(-3, -2, -6);
  14385. * // => true
  14386. */
  14387. function inRange(number, start, end) {
  14388. start = toFinite(start);
  14389. if (end === undefined) {
  14390. end = start;
  14391. start = 0;
  14392. } else {
  14393. end = toFinite(end);
  14394. }
  14395. number = toNumber(number);
  14396. return baseInRange(number, start, end);
  14397. }
  14398. /**
  14399. * Produces a random number between the inclusive `lower` and `upper` bounds.
  14400. * If only one argument is provided a number between `0` and the given number
  14401. * is returned. If `floating` is `true`, or either `lower` or `upper` are
  14402. * floats, a floating-point number is returned instead of an integer.
  14403. *
  14404. * **Note:** JavaScript follows the IEEE-754 standard for resolving
  14405. * floating-point values which can produce unexpected results.
  14406. *
  14407. * @static
  14408. * @memberOf _
  14409. * @since 0.7.0
  14410. * @category Number
  14411. * @param {number} [lower=0] The lower bound.
  14412. * @param {number} [upper=1] The upper bound.
  14413. * @param {boolean} [floating] Specify returning a floating-point number.
  14414. * @returns {number} Returns the random number.
  14415. * @example
  14416. *
  14417. * _.random(0, 5);
  14418. * // => an integer between 0 and 5
  14419. *
  14420. * _.random(5);
  14421. * // => also an integer between 0 and 5
  14422. *
  14423. * _.random(5, true);
  14424. * // => a floating-point number between 0 and 5
  14425. *
  14426. * _.random(1.2, 5.2);
  14427. * // => a floating-point number between 1.2 and 5.2
  14428. */
  14429. function random(lower, upper, floating) {
  14430. if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
  14431. upper = floating = undefined;
  14432. }
  14433. if (floating === undefined) {
  14434. if (typeof upper == 'boolean') {
  14435. floating = upper;
  14436. upper = undefined;
  14437. }
  14438. else if (typeof lower == 'boolean') {
  14439. floating = lower;
  14440. lower = undefined;
  14441. }
  14442. }
  14443. if (lower === undefined && upper === undefined) {
  14444. lower = 0;
  14445. upper = 1;
  14446. }
  14447. else {
  14448. lower = toFinite(lower);
  14449. if (upper === undefined) {
  14450. upper = lower;
  14451. lower = 0;
  14452. } else {
  14453. upper = toFinite(upper);
  14454. }
  14455. }
  14456. if (lower > upper) {
  14457. var temp = lower;
  14458. lower = upper;
  14459. upper = temp;
  14460. }
  14461. if (floating || lower % 1 || upper % 1) {
  14462. var rand = nativeRandom();
  14463. return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
  14464. }
  14465. return baseRandom(lower, upper);
  14466. }
  14467. /*------------------------------------------------------------------------*/
  14468. /**
  14469. * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
  14470. *
  14471. * @static
  14472. * @memberOf _
  14473. * @since 3.0.0
  14474. * @category String
  14475. * @param {string} [string=''] The string to convert.
  14476. * @returns {string} Returns the camel cased string.
  14477. * @example
  14478. *
  14479. * _.camelCase('Foo Bar');
  14480. * // => 'fooBar'
  14481. *
  14482. * _.camelCase('--foo-bar--');
  14483. * // => 'fooBar'
  14484. *
  14485. * _.camelCase('__FOO_BAR__');
  14486. * // => 'fooBar'
  14487. */
  14488. var camelCase = createCompounder(function(result, word, index) {
  14489. word = word.toLowerCase();
  14490. return result + (index ? capitalize(word) : word);
  14491. });
  14492. /**
  14493. * Converts the first character of `string` to upper case and the remaining
  14494. * to lower case.
  14495. *
  14496. * @static
  14497. * @memberOf _
  14498. * @since 3.0.0
  14499. * @category String
  14500. * @param {string} [string=''] The string to capitalize.
  14501. * @returns {string} Returns the capitalized string.
  14502. * @example
  14503. *
  14504. * _.capitalize('FRED');
  14505. * // => 'Fred'
  14506. */
  14507. function capitalize(string) {
  14508. return upperFirst(toString(string).toLowerCase());
  14509. }
  14510. /**
  14511. * Deburrs `string` by converting
  14512. * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
  14513. * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)
  14514. * letters to basic Latin letters and removing
  14515. * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
  14516. *
  14517. * @static
  14518. * @memberOf _
  14519. * @since 3.0.0
  14520. * @category String
  14521. * @param {string} [string=''] The string to deburr.
  14522. * @returns {string} Returns the deburred string.
  14523. * @example
  14524. *
  14525. * _.deburr('déjà vu');
  14526. * // => 'deja vu'
  14527. */
  14528. function deburr(string) {
  14529. string = toString(string);
  14530. return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');
  14531. }
  14532. /**
  14533. * Checks if `string` ends with the given target string.
  14534. *
  14535. * @static
  14536. * @memberOf _
  14537. * @since 3.0.0
  14538. * @category String
  14539. * @param {string} [string=''] The string to inspect.
  14540. * @param {string} [target] The string to search for.
  14541. * @param {number} [position=string.length] The position to search up to.
  14542. * @returns {boolean} Returns `true` if `string` ends with `target`,
  14543. * else `false`.
  14544. * @example
  14545. *
  14546. * _.endsWith('abc', 'c');
  14547. * // => true
  14548. *
  14549. * _.endsWith('abc', 'b');
  14550. * // => false
  14551. *
  14552. * _.endsWith('abc', 'b', 2);
  14553. * // => true
  14554. */
  14555. function endsWith(string, target, position) {
  14556. string = toString(string);
  14557. target = baseToString(target);
  14558. var length = string.length;
  14559. position = position === undefined
  14560. ? length
  14561. : baseClamp(toInteger(position), 0, length);
  14562. var end = position;
  14563. position -= target.length;
  14564. return position >= 0 && string.slice(position, end) == target;
  14565. }
  14566. /**
  14567. * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
  14568. * corresponding HTML entities.
  14569. *
  14570. * **Note:** No other characters are escaped. To escape additional
  14571. * characters use a third-party library like [_he_](https://mths.be/he).
  14572. *
  14573. * Though the ">" character is escaped for symmetry, characters like
  14574. * ">" and "/" don't need escaping in HTML and have no special meaning
  14575. * unless they're part of a tag or unquoted attribute value. See
  14576. * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
  14577. * (under "semi-related fun fact") for more details.
  14578. *
  14579. * When working with HTML you should always
  14580. * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
  14581. * XSS vectors.
  14582. *
  14583. * @static
  14584. * @since 0.1.0
  14585. * @memberOf _
  14586. * @category String
  14587. * @param {string} [string=''] The string to escape.
  14588. * @returns {string} Returns the escaped string.
  14589. * @example
  14590. *
  14591. * _.escape('fred, barney, & pebbles');
  14592. * // => 'fred, barney, &amp; pebbles'
  14593. */
  14594. function escape(string) {
  14595. string = toString(string);
  14596. return (string && reHasUnescapedHtml.test(string))
  14597. ? string.replace(reUnescapedHtml, escapeHtmlChar)
  14598. : string;
  14599. }
  14600. /**
  14601. * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
  14602. * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
  14603. *
  14604. * @static
  14605. * @memberOf _
  14606. * @since 3.0.0
  14607. * @category String
  14608. * @param {string} [string=''] The string to escape.
  14609. * @returns {string} Returns the escaped string.
  14610. * @example
  14611. *
  14612. * _.escapeRegExp('[lodash](https://lodash.com/)');
  14613. * // => '\[lodash\]\(https://lodash\.com/\)'
  14614. */
  14615. function escapeRegExp(string) {
  14616. string = toString(string);
  14617. return (string && reHasRegExpChar.test(string))
  14618. ? string.replace(reRegExpChar, '\\$&')
  14619. : string;
  14620. }
  14621. /**
  14622. * Converts `string` to
  14623. * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
  14624. *
  14625. * @static
  14626. * @memberOf _
  14627. * @since 3.0.0
  14628. * @category String
  14629. * @param {string} [string=''] The string to convert.
  14630. * @returns {string} Returns the kebab cased string.
  14631. * @example
  14632. *
  14633. * _.kebabCase('Foo Bar');
  14634. * // => 'foo-bar'
  14635. *
  14636. * _.kebabCase('fooBar');
  14637. * // => 'foo-bar'
  14638. *
  14639. * _.kebabCase('__FOO_BAR__');
  14640. * // => 'foo-bar'
  14641. */
  14642. var kebabCase = createCompounder(function(result, word, index) {
  14643. return result + (index ? '-' : '') + word.toLowerCase();
  14644. });
  14645. /**
  14646. * Converts `string`, as space separated words, to lower case.
  14647. *
  14648. * @static
  14649. * @memberOf _
  14650. * @since 4.0.0
  14651. * @category String
  14652. * @param {string} [string=''] The string to convert.
  14653. * @returns {string} Returns the lower cased string.
  14654. * @example
  14655. *
  14656. * _.lowerCase('--Foo-Bar--');
  14657. * // => 'foo bar'
  14658. *
  14659. * _.lowerCase('fooBar');
  14660. * // => 'foo bar'
  14661. *
  14662. * _.lowerCase('__FOO_BAR__');
  14663. * // => 'foo bar'
  14664. */
  14665. var lowerCase = createCompounder(function(result, word, index) {
  14666. return result + (index ? ' ' : '') + word.toLowerCase();
  14667. });
  14668. /**
  14669. * Converts the first character of `string` to lower case.
  14670. *
  14671. * @static
  14672. * @memberOf _
  14673. * @since 4.0.0
  14674. * @category String
  14675. * @param {string} [string=''] The string to convert.
  14676. * @returns {string} Returns the converted string.
  14677. * @example
  14678. *
  14679. * _.lowerFirst('Fred');
  14680. * // => 'fred'
  14681. *
  14682. * _.lowerFirst('FRED');
  14683. * // => 'fRED'
  14684. */
  14685. var lowerFirst = createCaseFirst('toLowerCase');
  14686. /**
  14687. * Pads `string` on the left and right sides if it's shorter than `length`.
  14688. * Padding characters are truncated if they can't be evenly divided by `length`.
  14689. *
  14690. * @static
  14691. * @memberOf _
  14692. * @since 3.0.0
  14693. * @category String
  14694. * @param {string} [string=''] The string to pad.
  14695. * @param {number} [length=0] The padding length.
  14696. * @param {string} [chars=' '] The string used as padding.
  14697. * @returns {string} Returns the padded string.
  14698. * @example
  14699. *
  14700. * _.pad('abc', 8);
  14701. * // => ' abc '
  14702. *
  14703. * _.pad('abc', 8, '_-');
  14704. * // => '_-abc_-_'
  14705. *
  14706. * _.pad('abc', 3);
  14707. * // => 'abc'
  14708. */
  14709. function pad(string, length, chars) {
  14710. string = toString(string);
  14711. length = toInteger(length);
  14712. var strLength = length ? stringSize(string) : 0;
  14713. if (!length || strLength >= length) {
  14714. return string;
  14715. }
  14716. var mid = (length - strLength) / 2;
  14717. return (
  14718. createPadding(nativeFloor(mid), chars) +
  14719. string +
  14720. createPadding(nativeCeil(mid), chars)
  14721. );
  14722. }
  14723. /**
  14724. * Pads `string` on the right side if it's shorter than `length`. Padding
  14725. * characters are truncated if they exceed `length`.
  14726. *
  14727. * @static
  14728. * @memberOf _
  14729. * @since 4.0.0
  14730. * @category String
  14731. * @param {string} [string=''] The string to pad.
  14732. * @param {number} [length=0] The padding length.
  14733. * @param {string} [chars=' '] The string used as padding.
  14734. * @returns {string} Returns the padded string.
  14735. * @example
  14736. *
  14737. * _.padEnd('abc', 6);
  14738. * // => 'abc '
  14739. *
  14740. * _.padEnd('abc', 6, '_-');
  14741. * // => 'abc_-_'
  14742. *
  14743. * _.padEnd('abc', 3);
  14744. * // => 'abc'
  14745. */
  14746. function padEnd(string, length, chars) {
  14747. string = toString(string);
  14748. length = toInteger(length);
  14749. var strLength = length ? stringSize(string) : 0;
  14750. return (length && strLength < length)
  14751. ? (string + createPadding(length - strLength, chars))
  14752. : string;
  14753. }
  14754. /**
  14755. * Pads `string` on the left side if it's shorter than `length`. Padding
  14756. * characters are truncated if they exceed `length`.
  14757. *
  14758. * @static
  14759. * @memberOf _
  14760. * @since 4.0.0
  14761. * @category String
  14762. * @param {string} [string=''] The string to pad.
  14763. * @param {number} [length=0] The padding length.
  14764. * @param {string} [chars=' '] The string used as padding.
  14765. * @returns {string} Returns the padded string.
  14766. * @example
  14767. *
  14768. * _.padStart('abc', 6);
  14769. * // => ' abc'
  14770. *
  14771. * _.padStart('abc', 6, '_-');
  14772. * // => '_-_abc'
  14773. *
  14774. * _.padStart('abc', 3);
  14775. * // => 'abc'
  14776. */
  14777. function padStart(string, length, chars) {
  14778. string = toString(string);
  14779. length = toInteger(length);
  14780. var strLength = length ? stringSize(string) : 0;
  14781. return (length && strLength < length)
  14782. ? (createPadding(length - strLength, chars) + string)
  14783. : string;
  14784. }
  14785. /**
  14786. * Converts `string` to an integer of the specified radix. If `radix` is
  14787. * `undefined` or `0`, a `radix` of `10` is used unless `value` is a
  14788. * hexadecimal, in which case a `radix` of `16` is used.
  14789. *
  14790. * **Note:** This method aligns with the
  14791. * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
  14792. *
  14793. * @static
  14794. * @memberOf _
  14795. * @since 1.1.0
  14796. * @category String
  14797. * @param {string} string The string to convert.
  14798. * @param {number} [radix=10] The radix to interpret `value` by.
  14799. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  14800. * @returns {number} Returns the converted integer.
  14801. * @example
  14802. *
  14803. * _.parseInt('08');
  14804. * // => 8
  14805. *
  14806. * _.map(['6', '08', '10'], _.parseInt);
  14807. * // => [6, 8, 10]
  14808. */
  14809. function parseInt(string, radix, guard) {
  14810. if (guard || radix == null) {
  14811. radix = 0;
  14812. } else if (radix) {
  14813. radix = +radix;
  14814. }
  14815. return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
  14816. }
  14817. /**
  14818. * Repeats the given string `n` times.
  14819. *
  14820. * @static
  14821. * @memberOf _
  14822. * @since 3.0.0
  14823. * @category String
  14824. * @param {string} [string=''] The string to repeat.
  14825. * @param {number} [n=1] The number of times to repeat the string.
  14826. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  14827. * @returns {string} Returns the repeated string.
  14828. * @example
  14829. *
  14830. * _.repeat('*', 3);
  14831. * // => '***'
  14832. *
  14833. * _.repeat('abc', 2);
  14834. * // => 'abcabc'
  14835. *
  14836. * _.repeat('abc', 0);
  14837. * // => ''
  14838. */
  14839. function repeat(string, n, guard) {
  14840. if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {
  14841. n = 1;
  14842. } else {
  14843. n = toInteger(n);
  14844. }
  14845. return baseRepeat(toString(string), n);
  14846. }
  14847. /**
  14848. * Replaces matches for `pattern` in `string` with `replacement`.
  14849. *
  14850. * **Note:** This method is based on
  14851. * [`String#replace`](https://mdn.io/String/replace).
  14852. *
  14853. * @static
  14854. * @memberOf _
  14855. * @since 4.0.0
  14856. * @category String
  14857. * @param {string} [string=''] The string to modify.
  14858. * @param {RegExp|string} pattern The pattern to replace.
  14859. * @param {Function|string} replacement The match replacement.
  14860. * @returns {string} Returns the modified string.
  14861. * @example
  14862. *
  14863. * _.replace('Hi Fred', 'Fred', 'Barney');
  14864. * // => 'Hi Barney'
  14865. */
  14866. function replace() {
  14867. var args = arguments,
  14868. string = toString(args[0]);
  14869. return args.length < 3 ? string : string.replace(args[1], args[2]);
  14870. }
  14871. /**
  14872. * Converts `string` to
  14873. * [snake case](https://en.wikipedia.org/wiki/Snake_case).
  14874. *
  14875. * @static
  14876. * @memberOf _
  14877. * @since 3.0.0
  14878. * @category String
  14879. * @param {string} [string=''] The string to convert.
  14880. * @returns {string} Returns the snake cased string.
  14881. * @example
  14882. *
  14883. * _.snakeCase('Foo Bar');
  14884. * // => 'foo_bar'
  14885. *
  14886. * _.snakeCase('fooBar');
  14887. * // => 'foo_bar'
  14888. *
  14889. * _.snakeCase('--FOO-BAR--');
  14890. * // => 'foo_bar'
  14891. */
  14892. var snakeCase = createCompounder(function(result, word, index) {
  14893. return result + (index ? '_' : '') + word.toLowerCase();
  14894. });
  14895. /**
  14896. * Splits `string` by `separator`.
  14897. *
  14898. * **Note:** This method is based on
  14899. * [`String#split`](https://mdn.io/String/split).
  14900. *
  14901. * @static
  14902. * @memberOf _
  14903. * @since 4.0.0
  14904. * @category String
  14905. * @param {string} [string=''] The string to split.
  14906. * @param {RegExp|string} separator The separator pattern to split by.
  14907. * @param {number} [limit] The length to truncate results to.
  14908. * @returns {Array} Returns the string segments.
  14909. * @example
  14910. *
  14911. * _.split('a-b-c', '-', 2);
  14912. * // => ['a', 'b']
  14913. */
  14914. function split(string, separator, limit) {
  14915. if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {
  14916. separator = limit = undefined;
  14917. }
  14918. limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;
  14919. if (!limit) {
  14920. return [];
  14921. }
  14922. string = toString(string);
  14923. if (string && (
  14924. typeof separator == 'string' ||
  14925. (separator != null && !isRegExp(separator))
  14926. )) {
  14927. separator = baseToString(separator);
  14928. if (!separator && hasUnicode(string)) {
  14929. return castSlice(stringToArray(string), 0, limit);
  14930. }
  14931. }
  14932. return string.split(separator, limit);
  14933. }
  14934. /**
  14935. * Converts `string` to
  14936. * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
  14937. *
  14938. * @static
  14939. * @memberOf _
  14940. * @since 3.1.0
  14941. * @category String
  14942. * @param {string} [string=''] The string to convert.
  14943. * @returns {string} Returns the start cased string.
  14944. * @example
  14945. *
  14946. * _.startCase('--foo-bar--');
  14947. * // => 'Foo Bar'
  14948. *
  14949. * _.startCase('fooBar');
  14950. * // => 'Foo Bar'
  14951. *
  14952. * _.startCase('__FOO_BAR__');
  14953. * // => 'FOO BAR'
  14954. */
  14955. var startCase = createCompounder(function(result, word, index) {
  14956. return result + (index ? ' ' : '') + upperFirst(word);
  14957. });
  14958. /**
  14959. * Checks if `string` starts with the given target string.
  14960. *
  14961. * @static
  14962. * @memberOf _
  14963. * @since 3.0.0
  14964. * @category String
  14965. * @param {string} [string=''] The string to inspect.
  14966. * @param {string} [target] The string to search for.
  14967. * @param {number} [position=0] The position to search from.
  14968. * @returns {boolean} Returns `true` if `string` starts with `target`,
  14969. * else `false`.
  14970. * @example
  14971. *
  14972. * _.startsWith('abc', 'a');
  14973. * // => true
  14974. *
  14975. * _.startsWith('abc', 'b');
  14976. * // => false
  14977. *
  14978. * _.startsWith('abc', 'b', 1);
  14979. * // => true
  14980. */
  14981. function startsWith(string, target, position) {
  14982. string = toString(string);
  14983. position = position == null
  14984. ? 0
  14985. : baseClamp(toInteger(position), 0, string.length);
  14986. target = baseToString(target);
  14987. return string.slice(position, position + target.length) == target;
  14988. }
  14989. /**
  14990. * Creates a compiled template function that can interpolate data properties
  14991. * in "interpolate" delimiters, HTML-escape interpolated data properties in
  14992. * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
  14993. * properties may be accessed as free variables in the template. If a setting
  14994. * object is given, it takes precedence over `_.templateSettings` values.
  14995. *
  14996. * **Note:** In the development build `_.template` utilizes
  14997. * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
  14998. * for easier debugging.
  14999. *
  15000. * For more information on precompiling templates see
  15001. * [lodash's custom builds documentation](https://lodash.com/custom-builds).
  15002. *
  15003. * For more information on Chrome extension sandboxes see
  15004. * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
  15005. *
  15006. * @static
  15007. * @since 0.1.0
  15008. * @memberOf _
  15009. * @category String
  15010. * @param {string} [string=''] The template string.
  15011. * @param {Object} [options={}] The options object.
  15012. * @param {RegExp} [options.escape=_.templateSettings.escape]
  15013. * The HTML "escape" delimiter.
  15014. * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]
  15015. * The "evaluate" delimiter.
  15016. * @param {Object} [options.imports=_.templateSettings.imports]
  15017. * An object to import into the template as free variables.
  15018. * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]
  15019. * The "interpolate" delimiter.
  15020. * @param {string} [options.sourceURL='lodash.templateSources[n]']
  15021. * The sourceURL of the compiled template.
  15022. * @param {string} [options.variable='obj']
  15023. * The data object variable name.
  15024. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  15025. * @returns {Function} Returns the compiled template function.
  15026. * @example
  15027. *
  15028. * // Use the "interpolate" delimiter to create a compiled template.
  15029. * var compiled = _.template('hello <%= user %>!');
  15030. * compiled({ 'user': 'fred' });
  15031. * // => 'hello fred!'
  15032. *
  15033. * // Use the HTML "escape" delimiter to escape data property values.
  15034. * var compiled = _.template('<b><%- value %></b>');
  15035. * compiled({ 'value': '<script>' });
  15036. * // => '<b>&lt;script&gt;</b>'
  15037. *
  15038. * // Use the "evaluate" delimiter to execute JavaScript and generate HTML.
  15039. * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
  15040. * compiled({ 'users': ['fred', 'barney'] });
  15041. * // => '<li>fred</li><li>barney</li>'
  15042. *
  15043. * // Use the internal `print` function in "evaluate" delimiters.
  15044. * var compiled = _.template('<% print("hello " + user); %>!');
  15045. * compiled({ 'user': 'barney' });
  15046. * // => 'hello barney!'
  15047. *
  15048. * // Use the ES template literal delimiter as an "interpolate" delimiter.
  15049. * // Disable support by replacing the "interpolate" delimiter.
  15050. * var compiled = _.template('hello ${ user }!');
  15051. * compiled({ 'user': 'pebbles' });
  15052. * // => 'hello pebbles!'
  15053. *
  15054. * // Use backslashes to treat delimiters as plain text.
  15055. * var compiled = _.template('<%= "\\<%- value %\\>" %>');
  15056. * compiled({ 'value': 'ignored' });
  15057. * // => '<%- value %>'
  15058. *
  15059. * // Use the `imports` option to import `jQuery` as `jq`.
  15060. * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
  15061. * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
  15062. * compiled({ 'users': ['fred', 'barney'] });
  15063. * // => '<li>fred</li><li>barney</li>'
  15064. *
  15065. * // Use the `sourceURL` option to specify a custom sourceURL for the template.
  15066. * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
  15067. * compiled(data);
  15068. * // => Find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector.
  15069. *
  15070. * // Use the `variable` option to ensure a with-statement isn't used in the compiled template.
  15071. * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
  15072. * compiled.source;
  15073. * // => function(data) {
  15074. * // var __t, __p = '';
  15075. * // __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
  15076. * // return __p;
  15077. * // }
  15078. *
  15079. * // Use custom template delimiters.
  15080. * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
  15081. * var compiled = _.template('hello {{ user }}!');
  15082. * compiled({ 'user': 'mustache' });
  15083. * // => 'hello mustache!'
  15084. *
  15085. * // Use the `source` property to inline compiled templates for meaningful
  15086. * // line numbers in error messages and stack traces.
  15087. * fs.writeFileSync(path.join(process.cwd(), 'jst.js'), '\
  15088. * var JST = {\
  15089. * "main": ' + _.template(mainText).source + '\
  15090. * };\
  15091. * ');
  15092. */
  15093. function template(string, options, guard) {
  15094. // Based on John Resig's `tmpl` implementation
  15095. // (http://ejohn.org/blog/javascript-micro-templating/)
  15096. // and Laura Doktorova's doT.js (https://github.com/olado/doT).
  15097. var settings = lodash.templateSettings;
  15098. if (guard && isIterateeCall(string, options, guard)) {
  15099. options = undefined;
  15100. }
  15101. string = toString(string);
  15102. options = assignInWith({}, options, settings, customDefaultsAssignIn);
  15103. var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn),
  15104. importsKeys = keys(imports),
  15105. importsValues = baseValues(imports, importsKeys);
  15106. var isEscaping,
  15107. isEvaluating,
  15108. index = 0,
  15109. interpolate = options.interpolate || reNoMatch,
  15110. source = "__p += '";
  15111. // Compile the regexp to match each delimiter.
  15112. var reDelimiters = RegExp(
  15113. (options.escape || reNoMatch).source + '|' +
  15114. interpolate.source + '|' +
  15115. (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
  15116. (options.evaluate || reNoMatch).source + '|$'
  15117. , 'g');
  15118. // Use a sourceURL for easier debugging.
  15119. // The sourceURL gets injected into the source that's eval-ed, so be careful
  15120. // to normalize all kinds of whitespace, so e.g. newlines (and unicode versions of it) can't sneak in
  15121. // and escape the comment, thus injecting code that gets evaled.
  15122. var sourceURL = '//# sourceURL=' +
  15123. (hasOwnProperty.call(options, 'sourceURL')
  15124. ? (options.sourceURL + '').replace(/\s/g, ' ')
  15125. : ('lodash.templateSources[' + (++templateCounter) + ']')
  15126. ) + '\n';
  15127. string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
  15128. interpolateValue || (interpolateValue = esTemplateValue);
  15129. // Escape characters that can't be included in string literals.
  15130. source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);
  15131. // Replace delimiters with snippets.
  15132. if (escapeValue) {
  15133. isEscaping = true;
  15134. source += "' +\n__e(" + escapeValue + ") +\n'";
  15135. }
  15136. if (evaluateValue) {
  15137. isEvaluating = true;
  15138. source += "';\n" + evaluateValue + ";\n__p += '";
  15139. }
  15140. if (interpolateValue) {
  15141. source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
  15142. }
  15143. index = offset + match.length;
  15144. // The JS engine embedded in Adobe products needs `match` returned in
  15145. // order to produce the correct `offset` value.
  15146. return match;
  15147. });
  15148. source += "';\n";
  15149. // If `variable` is not specified wrap a with-statement around the generated
  15150. // code to add the data object to the top of the scope chain.
  15151. var variable = hasOwnProperty.call(options, 'variable') && options.variable;
  15152. if (!variable) {
  15153. source = 'with (obj) {\n' + source + '\n}\n';
  15154. }
  15155. // Cleanup code by stripping empty strings.
  15156. source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
  15157. .replace(reEmptyStringMiddle, '$1')
  15158. .replace(reEmptyStringTrailing, '$1;');
  15159. // Frame code as the function body.
  15160. source = 'function(' + (variable || 'obj') + ') {\n' +
  15161. (variable
  15162. ? ''
  15163. : 'obj || (obj = {});\n'
  15164. ) +
  15165. "var __t, __p = ''" +
  15166. (isEscaping
  15167. ? ', __e = _.escape'
  15168. : ''
  15169. ) +
  15170. (isEvaluating
  15171. ? ', __j = Array.prototype.join;\n' +
  15172. "function print() { __p += __j.call(arguments, '') }\n"
  15173. : ';\n'
  15174. ) +
  15175. source +
  15176. 'return __p\n}';
  15177. var result = attempt(function() {
  15178. return Function(importsKeys, sourceURL + 'return ' + source)
  15179. .apply(undefined, importsValues);
  15180. });
  15181. // Provide the compiled function's source by its `toString` method or
  15182. // the `source` property as a convenience for inlining compiled templates.
  15183. result.source = source;
  15184. if (isError(result)) {
  15185. throw result;
  15186. }
  15187. return result;
  15188. }
  15189. /**
  15190. * Converts `string`, as a whole, to lower case just like
  15191. * [String#toLowerCase](https://mdn.io/toLowerCase).
  15192. *
  15193. * @static
  15194. * @memberOf _
  15195. * @since 4.0.0
  15196. * @category String
  15197. * @param {string} [string=''] The string to convert.
  15198. * @returns {string} Returns the lower cased string.
  15199. * @example
  15200. *
  15201. * _.toLower('--Foo-Bar--');
  15202. * // => '--foo-bar--'
  15203. *
  15204. * _.toLower('fooBar');
  15205. * // => 'foobar'
  15206. *
  15207. * _.toLower('__FOO_BAR__');
  15208. * // => '__foo_bar__'
  15209. */
  15210. function toLower(value) {
  15211. return toString(value).toLowerCase();
  15212. }
  15213. /**
  15214. * Converts `string`, as a whole, to upper case just like
  15215. * [String#toUpperCase](https://mdn.io/toUpperCase).
  15216. *
  15217. * @static
  15218. * @memberOf _
  15219. * @since 4.0.0
  15220. * @category String
  15221. * @param {string} [string=''] The string to convert.
  15222. * @returns {string} Returns the upper cased string.
  15223. * @example
  15224. *
  15225. * _.toUpper('--foo-bar--');
  15226. * // => '--FOO-BAR--'
  15227. *
  15228. * _.toUpper('fooBar');
  15229. * // => 'FOOBAR'
  15230. *
  15231. * _.toUpper('__foo_bar__');
  15232. * // => '__FOO_BAR__'
  15233. */
  15234. function toUpper(value) {
  15235. return toString(value).toUpperCase();
  15236. }
  15237. /**
  15238. * Removes leading and trailing whitespace or specified characters from `string`.
  15239. *
  15240. * @static
  15241. * @memberOf _
  15242. * @since 3.0.0
  15243. * @category String
  15244. * @param {string} [string=''] The string to trim.
  15245. * @param {string} [chars=whitespace] The characters to trim.
  15246. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  15247. * @returns {string} Returns the trimmed string.
  15248. * @example
  15249. *
  15250. * _.trim(' abc ');
  15251. * // => 'abc'
  15252. *
  15253. * _.trim('-_-abc-_-', '_-');
  15254. * // => 'abc'
  15255. *
  15256. * _.map([' foo ', ' bar '], _.trim);
  15257. * // => ['foo', 'bar']
  15258. */
  15259. function trim(string, chars, guard) {
  15260. string = toString(string);
  15261. if (string && (guard || chars === undefined)) {
  15262. return string.replace(reTrim, '');
  15263. }
  15264. if (!string || !(chars = baseToString(chars))) {
  15265. return string;
  15266. }
  15267. var strSymbols = stringToArray(string),
  15268. chrSymbols = stringToArray(chars),
  15269. start = charsStartIndex(strSymbols, chrSymbols),
  15270. end = charsEndIndex(strSymbols, chrSymbols) + 1;
  15271. return castSlice(strSymbols, start, end).join('');
  15272. }
  15273. /**
  15274. * Removes trailing whitespace or specified characters from `string`.
  15275. *
  15276. * @static
  15277. * @memberOf _
  15278. * @since 4.0.0
  15279. * @category String
  15280. * @param {string} [string=''] The string to trim.
  15281. * @param {string} [chars=whitespace] The characters to trim.
  15282. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  15283. * @returns {string} Returns the trimmed string.
  15284. * @example
  15285. *
  15286. * _.trimEnd(' abc ');
  15287. * // => ' abc'
  15288. *
  15289. * _.trimEnd('-_-abc-_-', '_-');
  15290. * // => '-_-abc'
  15291. */
  15292. function trimEnd(string, chars, guard) {
  15293. string = toString(string);
  15294. if (string && (guard || chars === undefined)) {
  15295. return string.replace(reTrimEnd, '');
  15296. }
  15297. if (!string || !(chars = baseToString(chars))) {
  15298. return string;
  15299. }
  15300. var strSymbols = stringToArray(string),
  15301. end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;
  15302. return castSlice(strSymbols, 0, end).join('');
  15303. }
  15304. /**
  15305. * Removes leading whitespace or specified characters from `string`.
  15306. *
  15307. * @static
  15308. * @memberOf _
  15309. * @since 4.0.0
  15310. * @category String
  15311. * @param {string} [string=''] The string to trim.
  15312. * @param {string} [chars=whitespace] The characters to trim.
  15313. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  15314. * @returns {string} Returns the trimmed string.
  15315. * @example
  15316. *
  15317. * _.trimStart(' abc ');
  15318. * // => 'abc '
  15319. *
  15320. * _.trimStart('-_-abc-_-', '_-');
  15321. * // => 'abc-_-'
  15322. */
  15323. function trimStart(string, chars, guard) {
  15324. string = toString(string);
  15325. if (string && (guard || chars === undefined)) {
  15326. return string.replace(reTrimStart, '');
  15327. }
  15328. if (!string || !(chars = baseToString(chars))) {
  15329. return string;
  15330. }
  15331. var strSymbols = stringToArray(string),
  15332. start = charsStartIndex(strSymbols, stringToArray(chars));
  15333. return castSlice(strSymbols, start).join('');
  15334. }
  15335. /**
  15336. * Truncates `string` if it's longer than the given maximum string length.
  15337. * The last characters of the truncated string are replaced with the omission
  15338. * string which defaults to "...".
  15339. *
  15340. * @static
  15341. * @memberOf _
  15342. * @since 4.0.0
  15343. * @category String
  15344. * @param {string} [string=''] The string to truncate.
  15345. * @param {Object} [options={}] The options object.
  15346. * @param {number} [options.length=30] The maximum string length.
  15347. * @param {string} [options.omission='...'] The string to indicate text is omitted.
  15348. * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
  15349. * @returns {string} Returns the truncated string.
  15350. * @example
  15351. *
  15352. * _.truncate('hi-diddly-ho there, neighborino');
  15353. * // => 'hi-diddly-ho there, neighbo...'
  15354. *
  15355. * _.truncate('hi-diddly-ho there, neighborino', {
  15356. * 'length': 24,
  15357. * 'separator': ' '
  15358. * });
  15359. * // => 'hi-diddly-ho there,...'
  15360. *
  15361. * _.truncate('hi-diddly-ho there, neighborino', {
  15362. * 'length': 24,
  15363. * 'separator': /,? +/
  15364. * });
  15365. * // => 'hi-diddly-ho there...'
  15366. *
  15367. * _.truncate('hi-diddly-ho there, neighborino', {
  15368. * 'omission': ' [...]'
  15369. * });
  15370. * // => 'hi-diddly-ho there, neig [...]'
  15371. */
  15372. function truncate(string, options) {
  15373. var length = DEFAULT_TRUNC_LENGTH,
  15374. omission = DEFAULT_TRUNC_OMISSION;
  15375. if (isObject(options)) {
  15376. var separator = 'separator' in options ? options.separator : separator;
  15377. length = 'length' in options ? toInteger(options.length) : length;
  15378. omission = 'omission' in options ? baseToString(options.omission) : omission;
  15379. }
  15380. string = toString(string);
  15381. var strLength = string.length;
  15382. if (hasUnicode(string)) {
  15383. var strSymbols = stringToArray(string);
  15384. strLength = strSymbols.length;
  15385. }
  15386. if (length >= strLength) {
  15387. return string;
  15388. }
  15389. var end = length - stringSize(omission);
  15390. if (end < 1) {
  15391. return omission;
  15392. }
  15393. var result = strSymbols
  15394. ? castSlice(strSymbols, 0, end).join('')
  15395. : string.slice(0, end);
  15396. if (separator === undefined) {
  15397. return result + omission;
  15398. }
  15399. if (strSymbols) {
  15400. end += (result.length - end);
  15401. }
  15402. if (isRegExp(separator)) {
  15403. if (string.slice(end).search(separator)) {
  15404. var match,
  15405. substring = result;
  15406. if (!separator.global) {
  15407. separator = RegExp(separator.source, toString(reFlags.exec(separator)) + 'g');
  15408. }
  15409. separator.lastIndex = 0;
  15410. while ((match = separator.exec(substring))) {
  15411. var newEnd = match.index;
  15412. }
  15413. result = result.slice(0, newEnd === undefined ? end : newEnd);
  15414. }
  15415. } else if (string.indexOf(baseToString(separator), end) != end) {
  15416. var index = result.lastIndexOf(separator);
  15417. if (index > -1) {
  15418. result = result.slice(0, index);
  15419. }
  15420. }
  15421. return result + omission;
  15422. }
  15423. /**
  15424. * The inverse of `_.escape`; this method converts the HTML entities
  15425. * `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#39;` in `string` to
  15426. * their corresponding characters.
  15427. *
  15428. * **Note:** No other HTML entities are unescaped. To unescape additional
  15429. * HTML entities use a third-party library like [_he_](https://mths.be/he).
  15430. *
  15431. * @static
  15432. * @memberOf _
  15433. * @since 0.6.0
  15434. * @category String
  15435. * @param {string} [string=''] The string to unescape.
  15436. * @returns {string} Returns the unescaped string.
  15437. * @example
  15438. *
  15439. * _.unescape('fred, barney, &amp; pebbles');
  15440. * // => 'fred, barney, & pebbles'
  15441. */
  15442. function unescape(string) {
  15443. string = toString(string);
  15444. return (string && reHasEscapedHtml.test(string))
  15445. ? string.replace(reEscapedHtml, unescapeHtmlChar)
  15446. : string;
  15447. }
  15448. /**
  15449. * Converts `string`, as space separated words, to upper case.
  15450. *
  15451. * @static
  15452. * @memberOf _
  15453. * @since 4.0.0
  15454. * @category String
  15455. * @param {string} [string=''] The string to convert.
  15456. * @returns {string} Returns the upper cased string.
  15457. * @example
  15458. *
  15459. * _.upperCase('--foo-bar');
  15460. * // => 'FOO BAR'
  15461. *
  15462. * _.upperCase('fooBar');
  15463. * // => 'FOO BAR'
  15464. *
  15465. * _.upperCase('__foo_bar__');
  15466. * // => 'FOO BAR'
  15467. */
  15468. var upperCase = createCompounder(function(result, word, index) {
  15469. return result + (index ? ' ' : '') + word.toUpperCase();
  15470. });
  15471. /**
  15472. * Converts the first character of `string` to upper case.
  15473. *
  15474. * @static
  15475. * @memberOf _
  15476. * @since 4.0.0
  15477. * @category String
  15478. * @param {string} [string=''] The string to convert.
  15479. * @returns {string} Returns the converted string.
  15480. * @example
  15481. *
  15482. * _.upperFirst('fred');
  15483. * // => 'Fred'
  15484. *
  15485. * _.upperFirst('FRED');
  15486. * // => 'FRED'
  15487. */
  15488. var upperFirst = createCaseFirst('toUpperCase');
  15489. /**
  15490. * Splits `string` into an array of its words.
  15491. *
  15492. * @static
  15493. * @memberOf _
  15494. * @since 3.0.0
  15495. * @category String
  15496. * @param {string} [string=''] The string to inspect.
  15497. * @param {RegExp|string} [pattern] The pattern to match words.
  15498. * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
  15499. * @returns {Array} Returns the words of `string`.
  15500. * @example
  15501. *
  15502. * _.words('fred, barney, & pebbles');
  15503. * // => ['fred', 'barney', 'pebbles']
  15504. *
  15505. * _.words('fred, barney, & pebbles', /[^, ]+/g);
  15506. * // => ['fred', 'barney', '&', 'pebbles']
  15507. */
  15508. function words(string, pattern, guard) {
  15509. string = toString(string);
  15510. pattern = guard ? undefined : pattern;
  15511. if (pattern === undefined) {
  15512. return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);
  15513. }
  15514. return string.match(pattern) || [];
  15515. }
  15516. /*------------------------------------------------------------------------*/
  15517. /**
  15518. * Attempts to invoke `func`, returning either the result or the caught error
  15519. * object. Any additional arguments are provided to `func` when it's invoked.
  15520. *
  15521. * @static
  15522. * @memberOf _
  15523. * @since 3.0.0
  15524. * @category Util
  15525. * @param {Function} func The function to attempt.
  15526. * @param {...*} [args] The arguments to invoke `func` with.
  15527. * @returns {*} Returns the `func` result or error object.
  15528. * @example
  15529. *
  15530. * // Avoid throwing errors for invalid selectors.
  15531. * var elements = _.attempt(function(selector) {
  15532. * return document.querySelectorAll(selector);
  15533. * }, '>_>');
  15534. *
  15535. * if (_.isError(elements)) {
  15536. * elements = [];
  15537. * }
  15538. */
  15539. var attempt = baseRest(function(func, args) {
  15540. try {
  15541. return apply(func, undefined, args);
  15542. } catch (e) {
  15543. return isError(e) ? e : new Error(e);
  15544. }
  15545. });
  15546. /**
  15547. * Binds methods of an object to the object itself, overwriting the existing
  15548. * method.
  15549. *
  15550. * **Note:** This method doesn't set the "length" property of bound functions.
  15551. *
  15552. * @static
  15553. * @since 0.1.0
  15554. * @memberOf _
  15555. * @category Util
  15556. * @param {Object} object The object to bind and assign the bound methods to.
  15557. * @param {...(string|string[])} methodNames The object method names to bind.
  15558. * @returns {Object} Returns `object`.
  15559. * @example
  15560. *
  15561. * var view = {
  15562. * 'label': 'docs',
  15563. * 'click': function() {
  15564. * console.log('clicked ' + this.label);
  15565. * }
  15566. * };
  15567. *
  15568. * _.bindAll(view, ['click']);
  15569. * jQuery(element).on('click', view.click);
  15570. * // => Logs 'clicked docs' when clicked.
  15571. */
  15572. var bindAll = flatRest(function(object, methodNames) {
  15573. arrayEach(methodNames, function(key) {
  15574. key = toKey(key);
  15575. baseAssignValue(object, key, bind(object[key], object));
  15576. });
  15577. return object;
  15578. });
  15579. /**
  15580. * Creates a function that iterates over `pairs` and invokes the corresponding
  15581. * function of the first predicate to return truthy. The predicate-function
  15582. * pairs are invoked with the `this` binding and arguments of the created
  15583. * function.
  15584. *
  15585. * @static
  15586. * @memberOf _
  15587. * @since 4.0.0
  15588. * @category Util
  15589. * @param {Array} pairs The predicate-function pairs.
  15590. * @returns {Function} Returns the new composite function.
  15591. * @example
  15592. *
  15593. * var func = _.cond([
  15594. * [_.matches({ 'a': 1 }), _.constant('matches A')],
  15595. * [_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
  15596. * [_.stubTrue, _.constant('no match')]
  15597. * ]);
  15598. *
  15599. * func({ 'a': 1, 'b': 2 });
  15600. * // => 'matches A'
  15601. *
  15602. * func({ 'a': 0, 'b': 1 });
  15603. * // => 'matches B'
  15604. *
  15605. * func({ 'a': '1', 'b': '2' });
  15606. * // => 'no match'
  15607. */
  15608. function cond(pairs) {
  15609. var length = pairs == null ? 0 : pairs.length,
  15610. toIteratee = getIteratee();
  15611. pairs = !length ? [] : arrayMap(pairs, function(pair) {
  15612. if (typeof pair[1] != 'function') {
  15613. throw new TypeError(FUNC_ERROR_TEXT);
  15614. }
  15615. return [toIteratee(pair[0]), pair[1]];
  15616. });
  15617. return baseRest(function(args) {
  15618. var index = -1;
  15619. while (++index < length) {
  15620. var pair = pairs[index];
  15621. if (apply(pair[0], this, args)) {
  15622. return apply(pair[1], this, args);
  15623. }
  15624. }
  15625. });
  15626. }
  15627. /**
  15628. * Creates a function that invokes the predicate properties of `source` with
  15629. * the corresponding property values of a given object, returning `true` if
  15630. * all predicates return truthy, else `false`.
  15631. *
  15632. * **Note:** The created function is equivalent to `_.conformsTo` with
  15633. * `source` partially applied.
  15634. *
  15635. * @static
  15636. * @memberOf _
  15637. * @since 4.0.0
  15638. * @category Util
  15639. * @param {Object} source The object of property predicates to conform to.
  15640. * @returns {Function} Returns the new spec function.
  15641. * @example
  15642. *
  15643. * var objects = [
  15644. * { 'a': 2, 'b': 1 },
  15645. * { 'a': 1, 'b': 2 }
  15646. * ];
  15647. *
  15648. * _.filter(objects, _.conforms({ 'b': function(n) { return n > 1; } }));
  15649. * // => [{ 'a': 1, 'b': 2 }]
  15650. */
  15651. function conforms(source) {
  15652. return baseConforms(baseClone(source, CLONE_DEEP_FLAG));
  15653. }
  15654. /**
  15655. * Creates a function that returns `value`.
  15656. *
  15657. * @static
  15658. * @memberOf _
  15659. * @since 2.4.0
  15660. * @category Util
  15661. * @param {*} value The value to return from the new function.
  15662. * @returns {Function} Returns the new constant function.
  15663. * @example
  15664. *
  15665. * var objects = _.times(2, _.constant({ 'a': 1 }));
  15666. *
  15667. * console.log(objects);
  15668. * // => [{ 'a': 1 }, { 'a': 1 }]
  15669. *
  15670. * console.log(objects[0] === objects[1]);
  15671. * // => true
  15672. */
  15673. function constant(value) {
  15674. return function() {
  15675. return value;
  15676. };
  15677. }
  15678. /**
  15679. * Checks `value` to determine whether a default value should be returned in
  15680. * its place. The `defaultValue` is returned if `value` is `NaN`, `null`,
  15681. * or `undefined`.
  15682. *
  15683. * @static
  15684. * @memberOf _
  15685. * @since 4.14.0
  15686. * @category Util
  15687. * @param {*} value The value to check.
  15688. * @param {*} defaultValue The default value.
  15689. * @returns {*} Returns the resolved value.
  15690. * @example
  15691. *
  15692. * _.defaultTo(1, 10);
  15693. * // => 1
  15694. *
  15695. * _.defaultTo(undefined, 10);
  15696. * // => 10
  15697. */
  15698. function defaultTo(value, defaultValue) {
  15699. return (value == null || value !== value) ? defaultValue : value;
  15700. }
  15701. /**
  15702. * Creates a function that returns the result of invoking the given functions
  15703. * with the `this` binding of the created function, where each successive
  15704. * invocation is supplied the return value of the previous.
  15705. *
  15706. * @static
  15707. * @memberOf _
  15708. * @since 3.0.0
  15709. * @category Util
  15710. * @param {...(Function|Function[])} [funcs] The functions to invoke.
  15711. * @returns {Function} Returns the new composite function.
  15712. * @see _.flowRight
  15713. * @example
  15714. *
  15715. * function square(n) {
  15716. * return n * n;
  15717. * }
  15718. *
  15719. * var addSquare = _.flow([_.add, square]);
  15720. * addSquare(1, 2);
  15721. * // => 9
  15722. */
  15723. var flow = createFlow();
  15724. /**
  15725. * This method is like `_.flow` except that it creates a function that
  15726. * invokes the given functions from right to left.
  15727. *
  15728. * @static
  15729. * @since 3.0.0
  15730. * @memberOf _
  15731. * @category Util
  15732. * @param {...(Function|Function[])} [funcs] The functions to invoke.
  15733. * @returns {Function} Returns the new composite function.
  15734. * @see _.flow
  15735. * @example
  15736. *
  15737. * function square(n) {
  15738. * return n * n;
  15739. * }
  15740. *
  15741. * var addSquare = _.flowRight([square, _.add]);
  15742. * addSquare(1, 2);
  15743. * // => 9
  15744. */
  15745. var flowRight = createFlow(true);
  15746. /**
  15747. * This method returns the first argument it receives.
  15748. *
  15749. * @static
  15750. * @since 0.1.0
  15751. * @memberOf _
  15752. * @category Util
  15753. * @param {*} value Any value.
  15754. * @returns {*} Returns `value`.
  15755. * @example
  15756. *
  15757. * var object = { 'a': 1 };
  15758. *
  15759. * console.log(_.identity(object) === object);
  15760. * // => true
  15761. */
  15762. function identity(value) {
  15763. return value;
  15764. }
  15765. /**
  15766. * Creates a function that invokes `func` with the arguments of the created
  15767. * function. If `func` is a property name, the created function returns the
  15768. * property value for a given element. If `func` is an array or object, the
  15769. * created function returns `true` for elements that contain the equivalent
  15770. * source properties, otherwise it returns `false`.
  15771. *
  15772. * @static
  15773. * @since 4.0.0
  15774. * @memberOf _
  15775. * @category Util
  15776. * @param {*} [func=_.identity] The value to convert to a callback.
  15777. * @returns {Function} Returns the callback.
  15778. * @example
  15779. *
  15780. * var users = [
  15781. * { 'user': 'barney', 'age': 36, 'active': true },
  15782. * { 'user': 'fred', 'age': 40, 'active': false }
  15783. * ];
  15784. *
  15785. * // The `_.matches` iteratee shorthand.
  15786. * _.filter(users, _.iteratee({ 'user': 'barney', 'active': true }));
  15787. * // => [{ 'user': 'barney', 'age': 36, 'active': true }]
  15788. *
  15789. * // The `_.matchesProperty` iteratee shorthand.
  15790. * _.filter(users, _.iteratee(['user', 'fred']));
  15791. * // => [{ 'user': 'fred', 'age': 40 }]
  15792. *
  15793. * // The `_.property` iteratee shorthand.
  15794. * _.map(users, _.iteratee('user'));
  15795. * // => ['barney', 'fred']
  15796. *
  15797. * // Create custom iteratee shorthands.
  15798. * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
  15799. * return !_.isRegExp(func) ? iteratee(func) : function(string) {
  15800. * return func.test(string);
  15801. * };
  15802. * });
  15803. *
  15804. * _.filter(['abc', 'def'], /ef/);
  15805. * // => ['def']
  15806. */
  15807. function iteratee(func) {
  15808. return baseIteratee(typeof func == 'function' ? func : baseClone(func, CLONE_DEEP_FLAG));
  15809. }
  15810. /**
  15811. * Creates a function that performs a partial deep comparison between a given
  15812. * object and `source`, returning `true` if the given object has equivalent
  15813. * property values, else `false`.
  15814. *
  15815. * **Note:** The created function is equivalent to `_.isMatch` with `source`
  15816. * partially applied.
  15817. *
  15818. * Partial comparisons will match empty array and empty object `source`
  15819. * values against any array or object value, respectively. See `_.isEqual`
  15820. * for a list of supported value comparisons.
  15821. *
  15822. * **Note:** Multiple values can be checked by combining several matchers
  15823. * using `_.overSome`
  15824. *
  15825. * @static
  15826. * @memberOf _
  15827. * @since 3.0.0
  15828. * @category Util
  15829. * @param {Object} source The object of property values to match.
  15830. * @returns {Function} Returns the new spec function.
  15831. * @example
  15832. *
  15833. * var objects = [
  15834. * { 'a': 1, 'b': 2, 'c': 3 },
  15835. * { 'a': 4, 'b': 5, 'c': 6 }
  15836. * ];
  15837. *
  15838. * _.filter(objects, _.matches({ 'a': 4, 'c': 6 }));
  15839. * // => [{ 'a': 4, 'b': 5, 'c': 6 }]
  15840. *
  15841. * // Checking for several possible values
  15842. * _.filter(objects, _.overSome([_.matches({ 'a': 1 }), _.matches({ 'a': 4 })]));
  15843. * // => [{ 'a': 1, 'b': 2, 'c': 3 }, { 'a': 4, 'b': 5, 'c': 6 }]
  15844. */
  15845. function matches(source) {
  15846. return baseMatches(baseClone(source, CLONE_DEEP_FLAG));
  15847. }
  15848. /**
  15849. * Creates a function that performs a partial deep comparison between the
  15850. * value at `path` of a given object to `srcValue`, returning `true` if the
  15851. * object value is equivalent, else `false`.
  15852. *
  15853. * **Note:** Partial comparisons will match empty array and empty object
  15854. * `srcValue` values against any array or object value, respectively. See
  15855. * `_.isEqual` for a list of supported value comparisons.
  15856. *
  15857. * **Note:** Multiple values can be checked by combining several matchers
  15858. * using `_.overSome`
  15859. *
  15860. * @static
  15861. * @memberOf _
  15862. * @since 3.2.0
  15863. * @category Util
  15864. * @param {Array|string} path The path of the property to get.
  15865. * @param {*} srcValue The value to match.
  15866. * @returns {Function} Returns the new spec function.
  15867. * @example
  15868. *
  15869. * var objects = [
  15870. * { 'a': 1, 'b': 2, 'c': 3 },
  15871. * { 'a': 4, 'b': 5, 'c': 6 }
  15872. * ];
  15873. *
  15874. * _.find(objects, _.matchesProperty('a', 4));
  15875. * // => { 'a': 4, 'b': 5, 'c': 6 }
  15876. *
  15877. * // Checking for several possible values
  15878. * _.filter(objects, _.overSome([_.matchesProperty('a', 1), _.matchesProperty('a', 4)]));
  15879. * // => [{ 'a': 1, 'b': 2, 'c': 3 }, { 'a': 4, 'b': 5, 'c': 6 }]
  15880. */
  15881. function matchesProperty(path, srcValue) {
  15882. return baseMatchesProperty(path, baseClone(srcValue, CLONE_DEEP_FLAG));
  15883. }
  15884. /**
  15885. * Creates a function that invokes the method at `path` of a given object.
  15886. * Any additional arguments are provided to the invoked method.
  15887. *
  15888. * @static
  15889. * @memberOf _
  15890. * @since 3.7.0
  15891. * @category Util
  15892. * @param {Array|string} path The path of the method to invoke.
  15893. * @param {...*} [args] The arguments to invoke the method with.
  15894. * @returns {Function} Returns the new invoker function.
  15895. * @example
  15896. *
  15897. * var objects = [
  15898. * { 'a': { 'b': _.constant(2) } },
  15899. * { 'a': { 'b': _.constant(1) } }
  15900. * ];
  15901. *
  15902. * _.map(objects, _.method('a.b'));
  15903. * // => [2, 1]
  15904. *
  15905. * _.map(objects, _.method(['a', 'b']));
  15906. * // => [2, 1]
  15907. */
  15908. var method = baseRest(function(path, args) {
  15909. return function(object) {
  15910. return baseInvoke(object, path, args);
  15911. };
  15912. });
  15913. /**
  15914. * The opposite of `_.method`; this method creates a function that invokes
  15915. * the method at a given path of `object`. Any additional arguments are
  15916. * provided to the invoked method.
  15917. *
  15918. * @static
  15919. * @memberOf _
  15920. * @since 3.7.0
  15921. * @category Util
  15922. * @param {Object} object The object to query.
  15923. * @param {...*} [args] The arguments to invoke the method with.
  15924. * @returns {Function} Returns the new invoker function.
  15925. * @example
  15926. *
  15927. * var array = _.times(3, _.constant),
  15928. * object = { 'a': array, 'b': array, 'c': array };
  15929. *
  15930. * _.map(['a[2]', 'c[0]'], _.methodOf(object));
  15931. * // => [2, 0]
  15932. *
  15933. * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
  15934. * // => [2, 0]
  15935. */
  15936. var methodOf = baseRest(function(object, args) {
  15937. return function(path) {
  15938. return baseInvoke(object, path, args);
  15939. };
  15940. });
  15941. /**
  15942. * Adds all own enumerable string keyed function properties of a source
  15943. * object to the destination object. If `object` is a function, then methods
  15944. * are added to its prototype as well.
  15945. *
  15946. * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
  15947. * avoid conflicts caused by modifying the original.
  15948. *
  15949. * @static
  15950. * @since 0.1.0
  15951. * @memberOf _
  15952. * @category Util
  15953. * @param {Function|Object} [object=lodash] The destination object.
  15954. * @param {Object} source The object of functions to add.
  15955. * @param {Object} [options={}] The options object.
  15956. * @param {boolean} [options.chain=true] Specify whether mixins are chainable.
  15957. * @returns {Function|Object} Returns `object`.
  15958. * @example
  15959. *
  15960. * function vowels(string) {
  15961. * return _.filter(string, function(v) {
  15962. * return /[aeiou]/i.test(v);
  15963. * });
  15964. * }
  15965. *
  15966. * _.mixin({ 'vowels': vowels });
  15967. * _.vowels('fred');
  15968. * // => ['e']
  15969. *
  15970. * _('fred').vowels().value();
  15971. * // => ['e']
  15972. *
  15973. * _.mixin({ 'vowels': vowels }, { 'chain': false });
  15974. * _('fred').vowels();
  15975. * // => ['e']
  15976. */
  15977. function mixin(object, source, options) {
  15978. var props = keys(source),
  15979. methodNames = baseFunctions(source, props);
  15980. if (options == null &&
  15981. !(isObject(source) && (methodNames.length || !props.length))) {
  15982. options = source;
  15983. source = object;
  15984. object = this;
  15985. methodNames = baseFunctions(source, keys(source));
  15986. }
  15987. var chain = !(isObject(options) && 'chain' in options) || !!options.chain,
  15988. isFunc = isFunction(object);
  15989. arrayEach(methodNames, function(methodName) {
  15990. var func = source[methodName];
  15991. object[methodName] = func;
  15992. if (isFunc) {
  15993. object.prototype[methodName] = function() {
  15994. var chainAll = this.__chain__;
  15995. if (chain || chainAll) {
  15996. var result = object(this.__wrapped__),
  15997. actions = result.__actions__ = copyArray(this.__actions__);
  15998. actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
  15999. result.__chain__ = chainAll;
  16000. return result;
  16001. }
  16002. return func.apply(object, arrayPush([this.value()], arguments));
  16003. };
  16004. }
  16005. });
  16006. return object;
  16007. }
  16008. /**
  16009. * Reverts the `_` variable to its previous value and returns a reference to
  16010. * the `lodash` function.
  16011. *
  16012. * @static
  16013. * @since 0.1.0
  16014. * @memberOf _
  16015. * @category Util
  16016. * @returns {Function} Returns the `lodash` function.
  16017. * @example
  16018. *
  16019. * var lodash = _.noConflict();
  16020. */
  16021. function noConflict() {
  16022. if (root._ === this) {
  16023. root._ = oldDash;
  16024. }
  16025. return this;
  16026. }
  16027. /**
  16028. * This method returns `undefined`.
  16029. *
  16030. * @static
  16031. * @memberOf _
  16032. * @since 2.3.0
  16033. * @category Util
  16034. * @example
  16035. *
  16036. * _.times(2, _.noop);
  16037. * // => [undefined, undefined]
  16038. */
  16039. function noop() {
  16040. // No operation performed.
  16041. }
  16042. /**
  16043. * Creates a function that gets the argument at index `n`. If `n` is negative,
  16044. * the nth argument from the end is returned.
  16045. *
  16046. * @static
  16047. * @memberOf _
  16048. * @since 4.0.0
  16049. * @category Util
  16050. * @param {number} [n=0] The index of the argument to return.
  16051. * @returns {Function} Returns the new pass-thru function.
  16052. * @example
  16053. *
  16054. * var func = _.nthArg(1);
  16055. * func('a', 'b', 'c', 'd');
  16056. * // => 'b'
  16057. *
  16058. * var func = _.nthArg(-2);
  16059. * func('a', 'b', 'c', 'd');
  16060. * // => 'c'
  16061. */
  16062. function nthArg(n) {
  16063. n = toInteger(n);
  16064. return baseRest(function(args) {
  16065. return baseNth(args, n);
  16066. });
  16067. }
  16068. /**
  16069. * Creates a function that invokes `iteratees` with the arguments it receives
  16070. * and returns their results.
  16071. *
  16072. * @static
  16073. * @memberOf _
  16074. * @since 4.0.0
  16075. * @category Util
  16076. * @param {...(Function|Function[])} [iteratees=[_.identity]]
  16077. * The iteratees to invoke.
  16078. * @returns {Function} Returns the new function.
  16079. * @example
  16080. *
  16081. * var func = _.over([Math.max, Math.min]);
  16082. *
  16083. * func(1, 2, 3, 4);
  16084. * // => [4, 1]
  16085. */
  16086. var over = createOver(arrayMap);
  16087. /**
  16088. * Creates a function that checks if **all** of the `predicates` return
  16089. * truthy when invoked with the arguments it receives.
  16090. *
  16091. * Following shorthands are possible for providing predicates.
  16092. * Pass an `Object` and it will be used as an parameter for `_.matches` to create the predicate.
  16093. * Pass an `Array` of parameters for `_.matchesProperty` and the predicate will be created using them.
  16094. *
  16095. * @static
  16096. * @memberOf _
  16097. * @since 4.0.0
  16098. * @category Util
  16099. * @param {...(Function|Function[])} [predicates=[_.identity]]
  16100. * The predicates to check.
  16101. * @returns {Function} Returns the new function.
  16102. * @example
  16103. *
  16104. * var func = _.overEvery([Boolean, isFinite]);
  16105. *
  16106. * func('1');
  16107. * // => true
  16108. *
  16109. * func(null);
  16110. * // => false
  16111. *
  16112. * func(NaN);
  16113. * // => false
  16114. */
  16115. var overEvery = createOver(arrayEvery);
  16116. /**
  16117. * Creates a function that checks if **any** of the `predicates` return
  16118. * truthy when invoked with the arguments it receives.
  16119. *
  16120. * Following shorthands are possible for providing predicates.
  16121. * Pass an `Object` and it will be used as an parameter for `_.matches` to create the predicate.
  16122. * Pass an `Array` of parameters for `_.matchesProperty` and the predicate will be created using them.
  16123. *
  16124. * @static
  16125. * @memberOf _
  16126. * @since 4.0.0
  16127. * @category Util
  16128. * @param {...(Function|Function[])} [predicates=[_.identity]]
  16129. * The predicates to check.
  16130. * @returns {Function} Returns the new function.
  16131. * @example
  16132. *
  16133. * var func = _.overSome([Boolean, isFinite]);
  16134. *
  16135. * func('1');
  16136. * // => true
  16137. *
  16138. * func(null);
  16139. * // => true
  16140. *
  16141. * func(NaN);
  16142. * // => false
  16143. *
  16144. * var matchesFunc = _.overSome([{ 'a': 1 }, { 'a': 2 }])
  16145. * var matchesPropertyFunc = _.overSome([['a', 1], ['a', 2]])
  16146. */
  16147. var overSome = createOver(arraySome);
  16148. /**
  16149. * Creates a function that returns the value at `path` of a given object.
  16150. *
  16151. * @static
  16152. * @memberOf _
  16153. * @since 2.4.0
  16154. * @category Util
  16155. * @param {Array|string} path The path of the property to get.
  16156. * @returns {Function} Returns the new accessor function.
  16157. * @example
  16158. *
  16159. * var objects = [
  16160. * { 'a': { 'b': 2 } },
  16161. * { 'a': { 'b': 1 } }
  16162. * ];
  16163. *
  16164. * _.map(objects, _.property('a.b'));
  16165. * // => [2, 1]
  16166. *
  16167. * _.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b');
  16168. * // => [1, 2]
  16169. */
  16170. function property(path) {
  16171. return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path);
  16172. }
  16173. /**
  16174. * The opposite of `_.property`; this method creates a function that returns
  16175. * the value at a given path of `object`.
  16176. *
  16177. * @static
  16178. * @memberOf _
  16179. * @since 3.0.0
  16180. * @category Util
  16181. * @param {Object} object The object to query.
  16182. * @returns {Function} Returns the new accessor function.
  16183. * @example
  16184. *
  16185. * var array = [0, 1, 2],
  16186. * object = { 'a': array, 'b': array, 'c': array };
  16187. *
  16188. * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
  16189. * // => [2, 0]
  16190. *
  16191. * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
  16192. * // => [2, 0]
  16193. */
  16194. function propertyOf(object) {
  16195. return function(path) {
  16196. return object == null ? undefined : baseGet(object, path);
  16197. };
  16198. }
  16199. /**
  16200. * Creates an array of numbers (positive and/or negative) progressing from
  16201. * `start` up to, but not including, `end`. A step of `-1` is used if a negative
  16202. * `start` is specified without an `end` or `step`. If `end` is not specified,
  16203. * it's set to `start` with `start` then set to `0`.
  16204. *
  16205. * **Note:** JavaScript follows the IEEE-754 standard for resolving
  16206. * floating-point values which can produce unexpected results.
  16207. *
  16208. * @static
  16209. * @since 0.1.0
  16210. * @memberOf _
  16211. * @category Util
  16212. * @param {number} [start=0] The start of the range.
  16213. * @param {number} end The end of the range.
  16214. * @param {number} [step=1] The value to increment or decrement by.
  16215. * @returns {Array} Returns the range of numbers.
  16216. * @see _.inRange, _.rangeRight
  16217. * @example
  16218. *
  16219. * _.range(4);
  16220. * // => [0, 1, 2, 3]
  16221. *
  16222. * _.range(-4);
  16223. * // => [0, -1, -2, -3]
  16224. *
  16225. * _.range(1, 5);
  16226. * // => [1, 2, 3, 4]
  16227. *
  16228. * _.range(0, 20, 5);
  16229. * // => [0, 5, 10, 15]
  16230. *
  16231. * _.range(0, -4, -1);
  16232. * // => [0, -1, -2, -3]
  16233. *
  16234. * _.range(1, 4, 0);
  16235. * // => [1, 1, 1]
  16236. *
  16237. * _.range(0);
  16238. * // => []
  16239. */
  16240. var range = createRange();
  16241. /**
  16242. * This method is like `_.range` except that it populates values in
  16243. * descending order.
  16244. *
  16245. * @static
  16246. * @memberOf _
  16247. * @since 4.0.0
  16248. * @category Util
  16249. * @param {number} [start=0] The start of the range.
  16250. * @param {number} end The end of the range.
  16251. * @param {number} [step=1] The value to increment or decrement by.
  16252. * @returns {Array} Returns the range of numbers.
  16253. * @see _.inRange, _.range
  16254. * @example
  16255. *
  16256. * _.rangeRight(4);
  16257. * // => [3, 2, 1, 0]
  16258. *
  16259. * _.rangeRight(-4);
  16260. * // => [-3, -2, -1, 0]
  16261. *
  16262. * _.rangeRight(1, 5);
  16263. * // => [4, 3, 2, 1]
  16264. *
  16265. * _.rangeRight(0, 20, 5);
  16266. * // => [15, 10, 5, 0]
  16267. *
  16268. * _.rangeRight(0, -4, -1);
  16269. * // => [-3, -2, -1, 0]
  16270. *
  16271. * _.rangeRight(1, 4, 0);
  16272. * // => [1, 1, 1]
  16273. *
  16274. * _.rangeRight(0);
  16275. * // => []
  16276. */
  16277. var rangeRight = createRange(true);
  16278. /**
  16279. * This method returns a new empty array.
  16280. *
  16281. * @static
  16282. * @memberOf _
  16283. * @since 4.13.0
  16284. * @category Util
  16285. * @returns {Array} Returns the new empty array.
  16286. * @example
  16287. *
  16288. * var arrays = _.times(2, _.stubArray);
  16289. *
  16290. * console.log(arrays);
  16291. * // => [[], []]
  16292. *
  16293. * console.log(arrays[0] === arrays[1]);
  16294. * // => false
  16295. */
  16296. function stubArray() {
  16297. return [];
  16298. }
  16299. /**
  16300. * This method returns `false`.
  16301. *
  16302. * @static
  16303. * @memberOf _
  16304. * @since 4.13.0
  16305. * @category Util
  16306. * @returns {boolean} Returns `false`.
  16307. * @example
  16308. *
  16309. * _.times(2, _.stubFalse);
  16310. * // => [false, false]
  16311. */
  16312. function stubFalse() {
  16313. return false;
  16314. }
  16315. /**
  16316. * This method returns a new empty object.
  16317. *
  16318. * @static
  16319. * @memberOf _
  16320. * @since 4.13.0
  16321. * @category Util
  16322. * @returns {Object} Returns the new empty object.
  16323. * @example
  16324. *
  16325. * var objects = _.times(2, _.stubObject);
  16326. *
  16327. * console.log(objects);
  16328. * // => [{}, {}]
  16329. *
  16330. * console.log(objects[0] === objects[1]);
  16331. * // => false
  16332. */
  16333. function stubObject() {
  16334. return {};
  16335. }
  16336. /**
  16337. * This method returns an empty string.
  16338. *
  16339. * @static
  16340. * @memberOf _
  16341. * @since 4.13.0
  16342. * @category Util
  16343. * @returns {string} Returns the empty string.
  16344. * @example
  16345. *
  16346. * _.times(2, _.stubString);
  16347. * // => ['', '']
  16348. */
  16349. function stubString() {
  16350. return '';
  16351. }
  16352. /**
  16353. * This method returns `true`.
  16354. *
  16355. * @static
  16356. * @memberOf _
  16357. * @since 4.13.0
  16358. * @category Util
  16359. * @returns {boolean} Returns `true`.
  16360. * @example
  16361. *
  16362. * _.times(2, _.stubTrue);
  16363. * // => [true, true]
  16364. */
  16365. function stubTrue() {
  16366. return true;
  16367. }
  16368. /**
  16369. * Invokes the iteratee `n` times, returning an array of the results of
  16370. * each invocation. The iteratee is invoked with one argument; (index).
  16371. *
  16372. * @static
  16373. * @since 0.1.0
  16374. * @memberOf _
  16375. * @category Util
  16376. * @param {number} n The number of times to invoke `iteratee`.
  16377. * @param {Function} [iteratee=_.identity] The function invoked per iteration.
  16378. * @returns {Array} Returns the array of results.
  16379. * @example
  16380. *
  16381. * _.times(3, String);
  16382. * // => ['0', '1', '2']
  16383. *
  16384. * _.times(4, _.constant(0));
  16385. * // => [0, 0, 0, 0]
  16386. */
  16387. function times(n, iteratee) {
  16388. n = toInteger(n);
  16389. if (n < 1 || n > MAX_SAFE_INTEGER) {
  16390. return [];
  16391. }
  16392. var index = MAX_ARRAY_LENGTH,
  16393. length = nativeMin(n, MAX_ARRAY_LENGTH);
  16394. iteratee = getIteratee(iteratee);
  16395. n -= MAX_ARRAY_LENGTH;
  16396. var result = baseTimes(length, iteratee);
  16397. while (++index < n) {
  16398. iteratee(index);
  16399. }
  16400. return result;
  16401. }
  16402. /**
  16403. * Converts `value` to a property path array.
  16404. *
  16405. * @static
  16406. * @memberOf _
  16407. * @since 4.0.0
  16408. * @category Util
  16409. * @param {*} value The value to convert.
  16410. * @returns {Array} Returns the new property path array.
  16411. * @example
  16412. *
  16413. * _.toPath('a.b.c');
  16414. * // => ['a', 'b', 'c']
  16415. *
  16416. * _.toPath('a[0].b.c');
  16417. * // => ['a', '0', 'b', 'c']
  16418. */
  16419. function toPath(value) {
  16420. if (isArray(value)) {
  16421. return arrayMap(value, toKey);
  16422. }
  16423. return isSymbol(value) ? [value] : copyArray(stringToPath(toString(value)));
  16424. }
  16425. /**
  16426. * Generates a unique ID. If `prefix` is given, the ID is appended to it.
  16427. *
  16428. * @static
  16429. * @since 0.1.0
  16430. * @memberOf _
  16431. * @category Util
  16432. * @param {string} [prefix=''] The value to prefix the ID with.
  16433. * @returns {string} Returns the unique ID.
  16434. * @example
  16435. *
  16436. * _.uniqueId('contact_');
  16437. * // => 'contact_104'
  16438. *
  16439. * _.uniqueId();
  16440. * // => '105'
  16441. */
  16442. function uniqueId(prefix) {
  16443. var id = ++idCounter;
  16444. return toString(prefix) + id;
  16445. }
  16446. /*------------------------------------------------------------------------*/
  16447. /**
  16448. * Adds two numbers.
  16449. *
  16450. * @static
  16451. * @memberOf _
  16452. * @since 3.4.0
  16453. * @category Math
  16454. * @param {number} augend The first number in an addition.
  16455. * @param {number} addend The second number in an addition.
  16456. * @returns {number} Returns the total.
  16457. * @example
  16458. *
  16459. * _.add(6, 4);
  16460. * // => 10
  16461. */
  16462. var add = createMathOperation(function(augend, addend) {
  16463. return augend + addend;
  16464. }, 0);
  16465. /**
  16466. * Computes `number` rounded up to `precision`.
  16467. *
  16468. * @static
  16469. * @memberOf _
  16470. * @since 3.10.0
  16471. * @category Math
  16472. * @param {number} number The number to round up.
  16473. * @param {number} [precision=0] The precision to round up to.
  16474. * @returns {number} Returns the rounded up number.
  16475. * @example
  16476. *
  16477. * _.ceil(4.006);
  16478. * // => 5
  16479. *
  16480. * _.ceil(6.004, 2);
  16481. * // => 6.01
  16482. *
  16483. * _.ceil(6040, -2);
  16484. * // => 6100
  16485. */
  16486. var ceil = createRound('ceil');
  16487. /**
  16488. * Divide two numbers.
  16489. *
  16490. * @static
  16491. * @memberOf _
  16492. * @since 4.7.0
  16493. * @category Math
  16494. * @param {number} dividend The first number in a division.
  16495. * @param {number} divisor The second number in a division.
  16496. * @returns {number} Returns the quotient.
  16497. * @example
  16498. *
  16499. * _.divide(6, 4);
  16500. * // => 1.5
  16501. */
  16502. var divide = createMathOperation(function(dividend, divisor) {
  16503. return dividend / divisor;
  16504. }, 1);
  16505. /**
  16506. * Computes `number` rounded down to `precision`.
  16507. *
  16508. * @static
  16509. * @memberOf _
  16510. * @since 3.10.0
  16511. * @category Math
  16512. * @param {number} number The number to round down.
  16513. * @param {number} [precision=0] The precision to round down to.
  16514. * @returns {number} Returns the rounded down number.
  16515. * @example
  16516. *
  16517. * _.floor(4.006);
  16518. * // => 4
  16519. *
  16520. * _.floor(0.046, 2);
  16521. * // => 0.04
  16522. *
  16523. * _.floor(4060, -2);
  16524. * // => 4000
  16525. */
  16526. var floor = createRound('floor');
  16527. /**
  16528. * Computes the maximum value of `array`. If `array` is empty or falsey,
  16529. * `undefined` is returned.
  16530. *
  16531. * @static
  16532. * @since 0.1.0
  16533. * @memberOf _
  16534. * @category Math
  16535. * @param {Array} array The array to iterate over.
  16536. * @returns {*} Returns the maximum value.
  16537. * @example
  16538. *
  16539. * _.max([4, 2, 8, 6]);
  16540. * // => 8
  16541. *
  16542. * _.max([]);
  16543. * // => undefined
  16544. */
  16545. function max(array) {
  16546. return (array && array.length)
  16547. ? baseExtremum(array, identity, baseGt)
  16548. : undefined;
  16549. }
  16550. /**
  16551. * This method is like `_.max` except that it accepts `iteratee` which is
  16552. * invoked for each element in `array` to generate the criterion by which
  16553. * the value is ranked. The iteratee is invoked with one argument: (value).
  16554. *
  16555. * @static
  16556. * @memberOf _
  16557. * @since 4.0.0
  16558. * @category Math
  16559. * @param {Array} array The array to iterate over.
  16560. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  16561. * @returns {*} Returns the maximum value.
  16562. * @example
  16563. *
  16564. * var objects = [{ 'n': 1 }, { 'n': 2 }];
  16565. *
  16566. * _.maxBy(objects, function(o) { return o.n; });
  16567. * // => { 'n': 2 }
  16568. *
  16569. * // The `_.property` iteratee shorthand.
  16570. * _.maxBy(objects, 'n');
  16571. * // => { 'n': 2 }
  16572. */
  16573. function maxBy(array, iteratee) {
  16574. return (array && array.length)
  16575. ? baseExtremum(array, getIteratee(iteratee, 2), baseGt)
  16576. : undefined;
  16577. }
  16578. /**
  16579. * Computes the mean of the values in `array`.
  16580. *
  16581. * @static
  16582. * @memberOf _
  16583. * @since 4.0.0
  16584. * @category Math
  16585. * @param {Array} array The array to iterate over.
  16586. * @returns {number} Returns the mean.
  16587. * @example
  16588. *
  16589. * _.mean([4, 2, 8, 6]);
  16590. * // => 5
  16591. */
  16592. function mean(array) {
  16593. return baseMean(array, identity);
  16594. }
  16595. /**
  16596. * This method is like `_.mean` except that it accepts `iteratee` which is
  16597. * invoked for each element in `array` to generate the value to be averaged.
  16598. * The iteratee is invoked with one argument: (value).
  16599. *
  16600. * @static
  16601. * @memberOf _
  16602. * @since 4.7.0
  16603. * @category Math
  16604. * @param {Array} array The array to iterate over.
  16605. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  16606. * @returns {number} Returns the mean.
  16607. * @example
  16608. *
  16609. * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
  16610. *
  16611. * _.meanBy(objects, function(o) { return o.n; });
  16612. * // => 5
  16613. *
  16614. * // The `_.property` iteratee shorthand.
  16615. * _.meanBy(objects, 'n');
  16616. * // => 5
  16617. */
  16618. function meanBy(array, iteratee) {
  16619. return baseMean(array, getIteratee(iteratee, 2));
  16620. }
  16621. /**
  16622. * Computes the minimum value of `array`. If `array` is empty or falsey,
  16623. * `undefined` is returned.
  16624. *
  16625. * @static
  16626. * @since 0.1.0
  16627. * @memberOf _
  16628. * @category Math
  16629. * @param {Array} array The array to iterate over.
  16630. * @returns {*} Returns the minimum value.
  16631. * @example
  16632. *
  16633. * _.min([4, 2, 8, 6]);
  16634. * // => 2
  16635. *
  16636. * _.min([]);
  16637. * // => undefined
  16638. */
  16639. function min(array) {
  16640. return (array && array.length)
  16641. ? baseExtremum(array, identity, baseLt)
  16642. : undefined;
  16643. }
  16644. /**
  16645. * This method is like `_.min` except that it accepts `iteratee` which is
  16646. * invoked for each element in `array` to generate the criterion by which
  16647. * the value is ranked. The iteratee is invoked with one argument: (value).
  16648. *
  16649. * @static
  16650. * @memberOf _
  16651. * @since 4.0.0
  16652. * @category Math
  16653. * @param {Array} array The array to iterate over.
  16654. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  16655. * @returns {*} Returns the minimum value.
  16656. * @example
  16657. *
  16658. * var objects = [{ 'n': 1 }, { 'n': 2 }];
  16659. *
  16660. * _.minBy(objects, function(o) { return o.n; });
  16661. * // => { 'n': 1 }
  16662. *
  16663. * // The `_.property` iteratee shorthand.
  16664. * _.minBy(objects, 'n');
  16665. * // => { 'n': 1 }
  16666. */
  16667. function minBy(array, iteratee) {
  16668. return (array && array.length)
  16669. ? baseExtremum(array, getIteratee(iteratee, 2), baseLt)
  16670. : undefined;
  16671. }
  16672. /**
  16673. * Multiply two numbers.
  16674. *
  16675. * @static
  16676. * @memberOf _
  16677. * @since 4.7.0
  16678. * @category Math
  16679. * @param {number} multiplier The first number in a multiplication.
  16680. * @param {number} multiplicand The second number in a multiplication.
  16681. * @returns {number} Returns the product.
  16682. * @example
  16683. *
  16684. * _.multiply(6, 4);
  16685. * // => 24
  16686. */
  16687. var multiply = createMathOperation(function(multiplier, multiplicand) {
  16688. return multiplier * multiplicand;
  16689. }, 1);
  16690. /**
  16691. * Computes `number` rounded to `precision`.
  16692. *
  16693. * @static
  16694. * @memberOf _
  16695. * @since 3.10.0
  16696. * @category Math
  16697. * @param {number} number The number to round.
  16698. * @param {number} [precision=0] The precision to round to.
  16699. * @returns {number} Returns the rounded number.
  16700. * @example
  16701. *
  16702. * _.round(4.006);
  16703. * // => 4
  16704. *
  16705. * _.round(4.006, 2);
  16706. * // => 4.01
  16707. *
  16708. * _.round(4060, -2);
  16709. * // => 4100
  16710. */
  16711. var round = createRound('round');
  16712. /**
  16713. * Subtract two numbers.
  16714. *
  16715. * @static
  16716. * @memberOf _
  16717. * @since 4.0.0
  16718. * @category Math
  16719. * @param {number} minuend The first number in a subtraction.
  16720. * @param {number} subtrahend The second number in a subtraction.
  16721. * @returns {number} Returns the difference.
  16722. * @example
  16723. *
  16724. * _.subtract(6, 4);
  16725. * // => 2
  16726. */
  16727. var subtract = createMathOperation(function(minuend, subtrahend) {
  16728. return minuend - subtrahend;
  16729. }, 0);
  16730. /**
  16731. * Computes the sum of the values in `array`.
  16732. *
  16733. * @static
  16734. * @memberOf _
  16735. * @since 3.4.0
  16736. * @category Math
  16737. * @param {Array} array The array to iterate over.
  16738. * @returns {number} Returns the sum.
  16739. * @example
  16740. *
  16741. * _.sum([4, 2, 8, 6]);
  16742. * // => 20
  16743. */
  16744. function sum(array) {
  16745. return (array && array.length)
  16746. ? baseSum(array, identity)
  16747. : 0;
  16748. }
  16749. /**
  16750. * This method is like `_.sum` except that it accepts `iteratee` which is
  16751. * invoked for each element in `array` to generate the value to be summed.
  16752. * The iteratee is invoked with one argument: (value).
  16753. *
  16754. * @static
  16755. * @memberOf _
  16756. * @since 4.0.0
  16757. * @category Math
  16758. * @param {Array} array The array to iterate over.
  16759. * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
  16760. * @returns {number} Returns the sum.
  16761. * @example
  16762. *
  16763. * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
  16764. *
  16765. * _.sumBy(objects, function(o) { return o.n; });
  16766. * // => 20
  16767. *
  16768. * // The `_.property` iteratee shorthand.
  16769. * _.sumBy(objects, 'n');
  16770. * // => 20
  16771. */
  16772. function sumBy(array, iteratee) {
  16773. return (array && array.length)
  16774. ? baseSum(array, getIteratee(iteratee, 2))
  16775. : 0;
  16776. }
  16777. /*------------------------------------------------------------------------*/
  16778. // Add methods that return wrapped values in chain sequences.
  16779. lodash.after = after;
  16780. lodash.ary = ary;
  16781. lodash.assign = assign;
  16782. lodash.assignIn = assignIn;
  16783. lodash.assignInWith = assignInWith;
  16784. lodash.assignWith = assignWith;
  16785. lodash.at = at;
  16786. lodash.before = before;
  16787. lodash.bind = bind;
  16788. lodash.bindAll = bindAll;
  16789. lodash.bindKey = bindKey;
  16790. lodash.castArray = castArray;
  16791. lodash.chain = chain;
  16792. lodash.chunk = chunk;
  16793. lodash.compact = compact;
  16794. lodash.concat = concat;
  16795. lodash.cond = cond;
  16796. lodash.conforms = conforms;
  16797. lodash.constant = constant;
  16798. lodash.countBy = countBy;
  16799. lodash.create = create;
  16800. lodash.curry = curry;
  16801. lodash.curryRight = curryRight;
  16802. lodash.debounce = debounce;
  16803. lodash.defaults = defaults;
  16804. lodash.defaultsDeep = defaultsDeep;
  16805. lodash.defer = defer;
  16806. lodash.delay = delay;
  16807. lodash.difference = difference;
  16808. lodash.differenceBy = differenceBy;
  16809. lodash.differenceWith = differenceWith;
  16810. lodash.drop = drop;
  16811. lodash.dropRight = dropRight;
  16812. lodash.dropRightWhile = dropRightWhile;
  16813. lodash.dropWhile = dropWhile;
  16814. lodash.fill = fill;
  16815. lodash.filter = filter;
  16816. lodash.flatMap = flatMap;
  16817. lodash.flatMapDeep = flatMapDeep;
  16818. lodash.flatMapDepth = flatMapDepth;
  16819. lodash.flatten = flatten;
  16820. lodash.flattenDeep = flattenDeep;
  16821. lodash.flattenDepth = flattenDepth;
  16822. lodash.flip = flip;
  16823. lodash.flow = flow;
  16824. lodash.flowRight = flowRight;
  16825. lodash.fromPairs = fromPairs;
  16826. lodash.functions = functions;
  16827. lodash.functionsIn = functionsIn;
  16828. lodash.groupBy = groupBy;
  16829. lodash.initial = initial;
  16830. lodash.intersection = intersection;
  16831. lodash.intersectionBy = intersectionBy;
  16832. lodash.intersectionWith = intersectionWith;
  16833. lodash.invert = invert;
  16834. lodash.invertBy = invertBy;
  16835. lodash.invokeMap = invokeMap;
  16836. lodash.iteratee = iteratee;
  16837. lodash.keyBy = keyBy;
  16838. lodash.keys = keys;
  16839. lodash.keysIn = keysIn;
  16840. lodash.map = map;
  16841. lodash.mapKeys = mapKeys;
  16842. lodash.mapValues = mapValues;
  16843. lodash.matches = matches;
  16844. lodash.matchesProperty = matchesProperty;
  16845. lodash.memoize = memoize;
  16846. lodash.merge = merge;
  16847. lodash.mergeWith = mergeWith;
  16848. lodash.method = method;
  16849. lodash.methodOf = methodOf;
  16850. lodash.mixin = mixin;
  16851. lodash.negate = negate;
  16852. lodash.nthArg = nthArg;
  16853. lodash.omit = omit;
  16854. lodash.omitBy = omitBy;
  16855. lodash.once = once;
  16856. lodash.orderBy = orderBy;
  16857. lodash.over = over;
  16858. lodash.overArgs = overArgs;
  16859. lodash.overEvery = overEvery;
  16860. lodash.overSome = overSome;
  16861. lodash.partial = partial;
  16862. lodash.partialRight = partialRight;
  16863. lodash.partition = partition;
  16864. lodash.pick = pick;
  16865. lodash.pickBy = pickBy;
  16866. lodash.property = property;
  16867. lodash.propertyOf = propertyOf;
  16868. lodash.pull = pull;
  16869. lodash.pullAll = pullAll;
  16870. lodash.pullAllBy = pullAllBy;
  16871. lodash.pullAllWith = pullAllWith;
  16872. lodash.pullAt = pullAt;
  16873. lodash.range = range;
  16874. lodash.rangeRight = rangeRight;
  16875. lodash.rearg = rearg;
  16876. lodash.reject = reject;
  16877. lodash.remove = remove;
  16878. lodash.rest = rest;
  16879. lodash.reverse = reverse;
  16880. lodash.sampleSize = sampleSize;
  16881. lodash.set = set;
  16882. lodash.setWith = setWith;
  16883. lodash.shuffle = shuffle;
  16884. lodash.slice = slice;
  16885. lodash.sortBy = sortBy;
  16886. lodash.sortedUniq = sortedUniq;
  16887. lodash.sortedUniqBy = sortedUniqBy;
  16888. lodash.split = split;
  16889. lodash.spread = spread;
  16890. lodash.tail = tail;
  16891. lodash.take = take;
  16892. lodash.takeRight = takeRight;
  16893. lodash.takeRightWhile = takeRightWhile;
  16894. lodash.takeWhile = takeWhile;
  16895. lodash.tap = tap;
  16896. lodash.throttle = throttle;
  16897. lodash.thru = thru;
  16898. lodash.toArray = toArray;
  16899. lodash.toPairs = toPairs;
  16900. lodash.toPairsIn = toPairsIn;
  16901. lodash.toPath = toPath;
  16902. lodash.toPlainObject = toPlainObject;
  16903. lodash.transform = transform;
  16904. lodash.unary = unary;
  16905. lodash.union = union;
  16906. lodash.unionBy = unionBy;
  16907. lodash.unionWith = unionWith;
  16908. lodash.uniq = uniq;
  16909. lodash.uniqBy = uniqBy;
  16910. lodash.uniqWith = uniqWith;
  16911. lodash.unset = unset;
  16912. lodash.unzip = unzip;
  16913. lodash.unzipWith = unzipWith;
  16914. lodash.update = update;
  16915. lodash.updateWith = updateWith;
  16916. lodash.values = values;
  16917. lodash.valuesIn = valuesIn;
  16918. lodash.without = without;
  16919. lodash.words = words;
  16920. lodash.wrap = wrap;
  16921. lodash.xor = xor;
  16922. lodash.xorBy = xorBy;
  16923. lodash.xorWith = xorWith;
  16924. lodash.zip = zip;
  16925. lodash.zipObject = zipObject;
  16926. lodash.zipObjectDeep = zipObjectDeep;
  16927. lodash.zipWith = zipWith;
  16928. // Add aliases.
  16929. lodash.entries = toPairs;
  16930. lodash.entriesIn = toPairsIn;
  16931. lodash.extend = assignIn;
  16932. lodash.extendWith = assignInWith;
  16933. // Add methods to `lodash.prototype`.
  16934. mixin(lodash, lodash);
  16935. /*------------------------------------------------------------------------*/
  16936. // Add methods that return unwrapped values in chain sequences.
  16937. lodash.add = add;
  16938. lodash.attempt = attempt;
  16939. lodash.camelCase = camelCase;
  16940. lodash.capitalize = capitalize;
  16941. lodash.ceil = ceil;
  16942. lodash.clamp = clamp;
  16943. lodash.clone = clone;
  16944. lodash.cloneDeep = cloneDeep;
  16945. lodash.cloneDeepWith = cloneDeepWith;
  16946. lodash.cloneWith = cloneWith;
  16947. lodash.conformsTo = conformsTo;
  16948. lodash.deburr = deburr;
  16949. lodash.defaultTo = defaultTo;
  16950. lodash.divide = divide;
  16951. lodash.endsWith = endsWith;
  16952. lodash.eq = eq;
  16953. lodash.escape = escape;
  16954. lodash.escapeRegExp = escapeRegExp;
  16955. lodash.every = every;
  16956. lodash.find = find;
  16957. lodash.findIndex = findIndex;
  16958. lodash.findKey = findKey;
  16959. lodash.findLast = findLast;
  16960. lodash.findLastIndex = findLastIndex;
  16961. lodash.findLastKey = findLastKey;
  16962. lodash.floor = floor;
  16963. lodash.forEach = forEach;
  16964. lodash.forEachRight = forEachRight;
  16965. lodash.forIn = forIn;
  16966. lodash.forInRight = forInRight;
  16967. lodash.forOwn = forOwn;
  16968. lodash.forOwnRight = forOwnRight;
  16969. lodash.get = get;
  16970. lodash.gt = gt;
  16971. lodash.gte = gte;
  16972. lodash.has = has;
  16973. lodash.hasIn = hasIn;
  16974. lodash.head = head;
  16975. lodash.identity = identity;
  16976. lodash.includes = includes;
  16977. lodash.indexOf = indexOf;
  16978. lodash.inRange = inRange;
  16979. lodash.invoke = invoke;
  16980. lodash.isArguments = isArguments;
  16981. lodash.isArray = isArray;
  16982. lodash.isArrayBuffer = isArrayBuffer;
  16983. lodash.isArrayLike = isArrayLike;
  16984. lodash.isArrayLikeObject = isArrayLikeObject;
  16985. lodash.isBoolean = isBoolean;
  16986. lodash.isBuffer = isBuffer;
  16987. lodash.isDate = isDate;
  16988. lodash.isElement = isElement;
  16989. lodash.isEmpty = isEmpty;
  16990. lodash.isEqual = isEqual;
  16991. lodash.isEqualWith = isEqualWith;
  16992. lodash.isError = isError;
  16993. lodash.isFinite = isFinite;
  16994. lodash.isFunction = isFunction;
  16995. lodash.isInteger = isInteger;
  16996. lodash.isLength = isLength;
  16997. lodash.isMap = isMap;
  16998. lodash.isMatch = isMatch;
  16999. lodash.isMatchWith = isMatchWith;
  17000. lodash.isNaN = isNaN;
  17001. lodash.isNative = isNative;
  17002. lodash.isNil = isNil;
  17003. lodash.isNull = isNull;
  17004. lodash.isNumber = isNumber;
  17005. lodash.isObject = isObject;
  17006. lodash.isObjectLike = isObjectLike;
  17007. lodash.isPlainObject = isPlainObject;
  17008. lodash.isRegExp = isRegExp;
  17009. lodash.isSafeInteger = isSafeInteger;
  17010. lodash.isSet = isSet;
  17011. lodash.isString = isString;
  17012. lodash.isSymbol = isSymbol;
  17013. lodash.isTypedArray = isTypedArray;
  17014. lodash.isUndefined = isUndefined;
  17015. lodash.isWeakMap = isWeakMap;
  17016. lodash.isWeakSet = isWeakSet;
  17017. lodash.join = join;
  17018. lodash.kebabCase = kebabCase;
  17019. lodash.last = last;
  17020. lodash.lastIndexOf = lastIndexOf;
  17021. lodash.lowerCase = lowerCase;
  17022. lodash.lowerFirst = lowerFirst;
  17023. lodash.lt = lt;
  17024. lodash.lte = lte;
  17025. lodash.max = max;
  17026. lodash.maxBy = maxBy;
  17027. lodash.mean = mean;
  17028. lodash.meanBy = meanBy;
  17029. lodash.min = min;
  17030. lodash.minBy = minBy;
  17031. lodash.stubArray = stubArray;
  17032. lodash.stubFalse = stubFalse;
  17033. lodash.stubObject = stubObject;
  17034. lodash.stubString = stubString;
  17035. lodash.stubTrue = stubTrue;
  17036. lodash.multiply = multiply;
  17037. lodash.nth = nth;
  17038. lodash.noConflict = noConflict;
  17039. lodash.noop = noop;
  17040. lodash.now = now;
  17041. lodash.pad = pad;
  17042. lodash.padEnd = padEnd;
  17043. lodash.padStart = padStart;
  17044. lodash.parseInt = parseInt;
  17045. lodash.random = random;
  17046. lodash.reduce = reduce;
  17047. lodash.reduceRight = reduceRight;
  17048. lodash.repeat = repeat;
  17049. lodash.replace = replace;
  17050. lodash.result = result;
  17051. lodash.round = round;
  17052. lodash.runInContext = runInContext;
  17053. lodash.sample = sample;
  17054. lodash.size = size;
  17055. lodash.snakeCase = snakeCase;
  17056. lodash.some = some;
  17057. lodash.sortedIndex = sortedIndex;
  17058. lodash.sortedIndexBy = sortedIndexBy;
  17059. lodash.sortedIndexOf = sortedIndexOf;
  17060. lodash.sortedLastIndex = sortedLastIndex;
  17061. lodash.sortedLastIndexBy = sortedLastIndexBy;
  17062. lodash.sortedLastIndexOf = sortedLastIndexOf;
  17063. lodash.startCase = startCase;
  17064. lodash.startsWith = startsWith;
  17065. lodash.subtract = subtract;
  17066. lodash.sum = sum;
  17067. lodash.sumBy = sumBy;
  17068. lodash.template = template;
  17069. lodash.times = times;
  17070. lodash.toFinite = toFinite;
  17071. lodash.toInteger = toInteger;
  17072. lodash.toLength = toLength;
  17073. lodash.toLower = toLower;
  17074. lodash.toNumber = toNumber;
  17075. lodash.toSafeInteger = toSafeInteger;
  17076. lodash.toString = toString;
  17077. lodash.toUpper = toUpper;
  17078. lodash.trim = trim;
  17079. lodash.trimEnd = trimEnd;
  17080. lodash.trimStart = trimStart;
  17081. lodash.truncate = truncate;
  17082. lodash.unescape = unescape;
  17083. lodash.uniqueId = uniqueId;
  17084. lodash.upperCase = upperCase;
  17085. lodash.upperFirst = upperFirst;
  17086. // Add aliases.
  17087. lodash.each = forEach;
  17088. lodash.eachRight = forEachRight;
  17089. lodash.first = head;
  17090. mixin(lodash, (function() {
  17091. var source = {};
  17092. baseForOwn(lodash, function(func, methodName) {
  17093. if (!hasOwnProperty.call(lodash.prototype, methodName)) {
  17094. source[methodName] = func;
  17095. }
  17096. });
  17097. return source;
  17098. }()), { 'chain': false });
  17099. /*------------------------------------------------------------------------*/
  17100. /**
  17101. * The semantic version number.
  17102. *
  17103. * @static
  17104. * @memberOf _
  17105. * @type {string}
  17106. */
  17107. lodash.VERSION = VERSION;
  17108. // Assign default placeholders.
  17109. arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
  17110. lodash[methodName].placeholder = lodash;
  17111. });
  17112. // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
  17113. arrayEach(['drop', 'take'], function(methodName, index) {
  17114. LazyWrapper.prototype[methodName] = function(n) {
  17115. n = n === undefined ? 1 : nativeMax(toInteger(n), 0);
  17116. var result = (this.__filtered__ && !index)
  17117. ? new LazyWrapper(this)
  17118. : this.clone();
  17119. if (result.__filtered__) {
  17120. result.__takeCount__ = nativeMin(n, result.__takeCount__);
  17121. } else {
  17122. result.__views__.push({
  17123. 'size': nativeMin(n, MAX_ARRAY_LENGTH),
  17124. 'type': methodName + (result.__dir__ < 0 ? 'Right' : '')
  17125. });
  17126. }
  17127. return result;
  17128. };
  17129. LazyWrapper.prototype[methodName + 'Right'] = function(n) {
  17130. return this.reverse()[methodName](n).reverse();
  17131. };
  17132. });
  17133. // Add `LazyWrapper` methods that accept an `iteratee` value.
  17134. arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
  17135. var type = index + 1,
  17136. isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG;
  17137. LazyWrapper.prototype[methodName] = function(iteratee) {
  17138. var result = this.clone();
  17139. result.__iteratees__.push({
  17140. 'iteratee': getIteratee(iteratee, 3),
  17141. 'type': type
  17142. });
  17143. result.__filtered__ = result.__filtered__ || isFilter;
  17144. return result;
  17145. };
  17146. });
  17147. // Add `LazyWrapper` methods for `_.head` and `_.last`.
  17148. arrayEach(['head', 'last'], function(methodName, index) {
  17149. var takeName = 'take' + (index ? 'Right' : '');
  17150. LazyWrapper.prototype[methodName] = function() {
  17151. return this[takeName](1).value()[0];
  17152. };
  17153. });
  17154. // Add `LazyWrapper` methods for `_.initial` and `_.tail`.
  17155. arrayEach(['initial', 'tail'], function(methodName, index) {
  17156. var dropName = 'drop' + (index ? '' : 'Right');
  17157. LazyWrapper.prototype[methodName] = function() {
  17158. return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1);
  17159. };
  17160. });
  17161. LazyWrapper.prototype.compact = function() {
  17162. return this.filter(identity);
  17163. };
  17164. LazyWrapper.prototype.find = function(predicate) {
  17165. return this.filter(predicate).head();
  17166. };
  17167. LazyWrapper.prototype.findLast = function(predicate) {
  17168. return this.reverse().find(predicate);
  17169. };
  17170. LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
  17171. if (typeof path == 'function') {
  17172. return new LazyWrapper(this);
  17173. }
  17174. return this.map(function(value) {
  17175. return baseInvoke(value, path, args);
  17176. });
  17177. });
  17178. LazyWrapper.prototype.reject = function(predicate) {
  17179. return this.filter(negate(getIteratee(predicate)));
  17180. };
  17181. LazyWrapper.prototype.slice = function(start, end) {
  17182. start = toInteger(start);
  17183. var result = this;
  17184. if (result.__filtered__ && (start > 0 || end < 0)) {
  17185. return new LazyWrapper(result);
  17186. }
  17187. if (start < 0) {
  17188. result = result.takeRight(-start);
  17189. } else if (start) {
  17190. result = result.drop(start);
  17191. }
  17192. if (end !== undefined) {
  17193. end = toInteger(end);
  17194. result = end < 0 ? result.dropRight(-end) : result.take(end - start);
  17195. }
  17196. return result;
  17197. };
  17198. LazyWrapper.prototype.takeRightWhile = function(predicate) {
  17199. return this.reverse().takeWhile(predicate).reverse();
  17200. };
  17201. LazyWrapper.prototype.toArray = function() {
  17202. return this.take(MAX_ARRAY_LENGTH);
  17203. };
  17204. // Add `LazyWrapper` methods to `lodash.prototype`.
  17205. baseForOwn(LazyWrapper.prototype, function(func, methodName) {
  17206. var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName),
  17207. isTaker = /^(?:head|last)$/.test(methodName),
  17208. lodashFunc = lodash[isTaker ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName],
  17209. retUnwrapped = isTaker || /^find/.test(methodName);
  17210. if (!lodashFunc) {
  17211. return;
  17212. }
  17213. lodash.prototype[methodName] = function() {
  17214. var value = this.__wrapped__,
  17215. args = isTaker ? [1] : arguments,
  17216. isLazy = value instanceof LazyWrapper,
  17217. iteratee = args[0],
  17218. useLazy = isLazy || isArray(value);
  17219. var interceptor = function(value) {
  17220. var result = lodashFunc.apply(lodash, arrayPush([value], args));
  17221. return (isTaker && chainAll) ? result[0] : result;
  17222. };
  17223. if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) {
  17224. // Avoid lazy use if the iteratee has a "length" value other than `1`.
  17225. isLazy = useLazy = false;
  17226. }
  17227. var chainAll = this.__chain__,
  17228. isHybrid = !!this.__actions__.length,
  17229. isUnwrapped = retUnwrapped && !chainAll,
  17230. onlyLazy = isLazy && !isHybrid;
  17231. if (!retUnwrapped && useLazy) {
  17232. value = onlyLazy ? value : new LazyWrapper(this);
  17233. var result = func.apply(value, args);
  17234. result.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
  17235. return new LodashWrapper(result, chainAll);
  17236. }
  17237. if (isUnwrapped && onlyLazy) {
  17238. return func.apply(this, args);
  17239. }
  17240. result = this.thru(interceptor);
  17241. return isUnwrapped ? (isTaker ? result.value()[0] : result.value()) : result;
  17242. };
  17243. });
  17244. // Add `Array` methods to `lodash.prototype`.
  17245. arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
  17246. var func = arrayProto[methodName],
  17247. chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
  17248. retUnwrapped = /^(?:pop|shift)$/.test(methodName);
  17249. lodash.prototype[methodName] = function() {
  17250. var args = arguments;
  17251. if (retUnwrapped && !this.__chain__) {
  17252. var value = this.value();
  17253. return func.apply(isArray(value) ? value : [], args);
  17254. }
  17255. return this[chainName](function(value) {
  17256. return func.apply(isArray(value) ? value : [], args);
  17257. });
  17258. };
  17259. });
  17260. // Map minified method names to their real names.
  17261. baseForOwn(LazyWrapper.prototype, function(func, methodName) {
  17262. var lodashFunc = lodash[methodName];
  17263. if (lodashFunc) {
  17264. var key = lodashFunc.name + '';
  17265. if (!hasOwnProperty.call(realNames, key)) {
  17266. realNames[key] = [];
  17267. }
  17268. realNames[key].push({ 'name': methodName, 'func': lodashFunc });
  17269. }
  17270. });
  17271. realNames[createHybrid(undefined, WRAP_BIND_KEY_FLAG).name] = [{
  17272. 'name': 'wrapper',
  17273. 'func': undefined
  17274. }];
  17275. // Add methods to `LazyWrapper`.
  17276. LazyWrapper.prototype.clone = lazyClone;
  17277. LazyWrapper.prototype.reverse = lazyReverse;
  17278. LazyWrapper.prototype.value = lazyValue;
  17279. // Add chain sequence methods to the `lodash` wrapper.
  17280. lodash.prototype.at = wrapperAt;
  17281. lodash.prototype.chain = wrapperChain;
  17282. lodash.prototype.commit = wrapperCommit;
  17283. lodash.prototype.next = wrapperNext;
  17284. lodash.prototype.plant = wrapperPlant;
  17285. lodash.prototype.reverse = wrapperReverse;
  17286. lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;
  17287. // Add lazy aliases.
  17288. lodash.prototype.first = lodash.prototype.head;
  17289. if (symIterator) {
  17290. lodash.prototype[symIterator] = wrapperToIterator;
  17291. }
  17292. return lodash;
  17293. });
  17294. /*--------------------------------------------------------------------------*/
  17295. // Export lodash.
  17296. var _ = runInContext();
  17297. // Some AMD build optimizers, like r.js, check for condition patterns like:
  17298. if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
  17299. // Expose Lodash on the global object to prevent errors when Lodash is
  17300. // loaded by a script tag in the presence of an AMD loader.
  17301. // See http://requirejs.org/docs/errors.html#mismatch for more details.
  17302. // Use `_.noConflict` to remove Lodash from the global object.
  17303. root._ = _;
  17304. // Define as an anonymous module so, through path mapping, it can be
  17305. // referenced as the "underscore" module.
  17306. define(function() {
  17307. return _;
  17308. });
  17309. }
  17310. // Check for `exports` after `define` in case a build optimizer adds it.
  17311. else if (freeModule) {
  17312. // Export for Node.js.
  17313. (freeModule.exports = _)._ = _;
  17314. // Export for CommonJS support.
  17315. freeExports._ = _;
  17316. }
  17317. else {
  17318. // Export to the global object.
  17319. root._ = _;
  17320. }
  17321. }.call(this));
  17322. }).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
  17323. },{}],13:[function(require,module,exports){
  17324. // shim for using process in browser
  17325. var process = module.exports = {};
  17326. var queue = [];
  17327. var draining = false;
  17328. function drainQueue() {
  17329. if (draining) {
  17330. return;
  17331. }
  17332. draining = true;
  17333. var currentQueue;
  17334. var len = queue.length;
  17335. while(len) {
  17336. currentQueue = queue;
  17337. queue = [];
  17338. var i = -1;
  17339. while (++i < len) {
  17340. currentQueue[i]();
  17341. }
  17342. len = queue.length;
  17343. }
  17344. draining = false;
  17345. }
  17346. process.nextTick = function (fun) {
  17347. queue.push(fun);
  17348. if (!draining) {
  17349. setTimeout(drainQueue, 0);
  17350. }
  17351. };
  17352. process.title = 'browser';
  17353. process.browser = true;
  17354. process.env = {};
  17355. process.argv = [];
  17356. process.version = ''; // empty string to avoid regexp issues
  17357. process.versions = {};
  17358. function noop() {}
  17359. process.on = noop;
  17360. process.addListener = noop;
  17361. process.once = noop;
  17362. process.off = noop;
  17363. process.removeListener = noop;
  17364. process.removeAllListeners = noop;
  17365. process.emit = noop;
  17366. process.binding = function (name) {
  17367. throw new Error('process.binding is not supported');
  17368. };
  17369. // TODO(shtylman)
  17370. process.cwd = function () { return '/' };
  17371. process.chdir = function (dir) {
  17372. throw new Error('process.chdir is not supported');
  17373. };
  17374. process.umask = function() { return 0; };
  17375. },{}],14:[function(require,module,exports){
  17376. arguments[4][6][0].apply(exports,arguments)
  17377. },{"dup":6}],15:[function(require,module,exports){
  17378. arguments[4][7][0].apply(exports,arguments)
  17379. },{"dup":7}],16:[function(require,module,exports){
  17380. arguments[4][8][0].apply(exports,arguments)
  17381. },{"./support/isBuffer":15,"_process":13,"dup":8,"inherits":14}],17:[function(require,module,exports){
  17382. /*
  17383. * Lexical analysis and token construction.
  17384. */
  17385. "use strict";
  17386. var _ = require("lodash");
  17387. var events = require("events");
  17388. var reg = require("./reg.js");
  17389. var state = require("./state.js").state;
  17390. var unicodeData = require("../data/ascii-identifier-data.js");
  17391. var asciiIdentifierStartTable = unicodeData.asciiIdentifierStartTable;
  17392. var asciiIdentifierPartTable = unicodeData.asciiIdentifierPartTable;
  17393. var nonAsciiIdentifierStartTable = require("../data/non-ascii-identifier-start.js");
  17394. var nonAsciiIdentifierPartTable = require("../data/non-ascii-identifier-part-only.js");
  17395. // Loading of this module is deferred as an optimization for ES2015 input
  17396. var es5IdentifierNames;
  17397. // Some of these token types are from JavaScript Parser API
  17398. // while others are specific to JSHint parser.
  17399. // JS Parser API: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API
  17400. var Token = {
  17401. Identifier: 1,
  17402. Punctuator: 2,
  17403. NumericLiteral: 3,
  17404. StringLiteral: 4,
  17405. Comment: 5,
  17406. Keyword: 6,
  17407. RegExp: 9,
  17408. TemplateHead: 10,
  17409. TemplateMiddle: 11,
  17410. TemplateTail: 12,
  17411. NoSubstTemplate: 13
  17412. };
  17413. var Context = {
  17414. Block: 1,
  17415. Template: 2
  17416. };
  17417. function isHex(str) {
  17418. return /^[0-9a-fA-F]+$/.test(str);
  17419. }
  17420. function isHexDigit(str) {
  17421. return str.length === 1 && isHex(str);
  17422. }
  17423. // Object that handles postponed lexing verifications that checks the parsed
  17424. // environment state.
  17425. function asyncTrigger() {
  17426. var _checks = [];
  17427. return {
  17428. push: function(fn) {
  17429. _checks.push(fn);
  17430. },
  17431. check: function() {
  17432. for (var check = 0; check < _checks.length; ++check) {
  17433. _checks[check]();
  17434. }
  17435. _checks.splice(0, _checks.length);
  17436. }
  17437. };
  17438. }
  17439. /*
  17440. * Lexer for JSHint.
  17441. *
  17442. * This object does a char-by-char scan of the provided source code
  17443. * and produces a sequence of tokens.
  17444. *
  17445. * var lex = new Lexer("var i = 0;");
  17446. * lex.start();
  17447. * lex.token(); // returns the next token
  17448. *
  17449. * You have to use the token() method to move the lexer forward
  17450. * but you don't have to use its return value to get tokens. In addition
  17451. * to token() method returning the next token, the Lexer object also
  17452. * emits events.
  17453. *
  17454. * lex.on("Identifier", function(data) {
  17455. * if (data.name.indexOf("_") >= 0) {
  17456. * // Produce a warning.
  17457. * }
  17458. * });
  17459. *
  17460. * Note that the token() method returns tokens in a JSLint-compatible
  17461. * format while the event emitter uses a slightly modified version of
  17462. * Mozilla's JavaScript Parser API. Eventually, we will move away from
  17463. * JSLint format.
  17464. */
  17465. function Lexer(source) {
  17466. var lines = source;
  17467. if (typeof lines === "string") {
  17468. lines = lines
  17469. .replace(/\r\n/g, "\n")
  17470. .replace(/\r/g, "\n")
  17471. .split("\n");
  17472. }
  17473. // If the first line is a shebang (#!), make it a blank and move on.
  17474. // Shebangs are used by Node scripts.
  17475. if (lines[0] && lines[0].substr(0, 2) === "#!") {
  17476. if (lines[0].indexOf("node") !== -1) {
  17477. state.option.node = true;
  17478. }
  17479. lines[0] = "";
  17480. }
  17481. this.emitter = new events.EventEmitter();
  17482. this.source = source;
  17483. this.setLines(lines);
  17484. this.prereg = true;
  17485. this.line = 0;
  17486. this.char = 1;
  17487. this.from = 1;
  17488. this.input = "";
  17489. this.inComment = false;
  17490. this.context = [];
  17491. this.templateStarts = [];
  17492. for (var i = 0; i < state.option.indent; i += 1) {
  17493. state.tab += " ";
  17494. }
  17495. }
  17496. Lexer.prototype = {
  17497. _lines: [],
  17498. inContext: function(ctxType) {
  17499. return this.context.length > 0 && this.context[this.context.length - 1].type === ctxType;
  17500. },
  17501. pushContext: function(ctxType) {
  17502. this.context.push({ type: ctxType });
  17503. },
  17504. popContext: function() {
  17505. return this.context.pop();
  17506. },
  17507. currentContext: function() {
  17508. return this.context.length > 0 && this.context[this.context.length - 1];
  17509. },
  17510. getLines: function() {
  17511. this._lines = state.lines;
  17512. return this._lines;
  17513. },
  17514. setLines: function(val) {
  17515. this._lines = val;
  17516. state.lines = this._lines;
  17517. },
  17518. /*
  17519. * Return the next i character without actually moving the
  17520. * char pointer.
  17521. */
  17522. peek: function(i) {
  17523. return this.input.charAt(i || 0);
  17524. },
  17525. /*
  17526. * Move the char pointer forward i times.
  17527. */
  17528. skip: function(i) {
  17529. i = i || 1;
  17530. this.char += i;
  17531. this.input = this.input.slice(i);
  17532. },
  17533. /*
  17534. * Subscribe to a token event. The API for this method is similar
  17535. * Underscore.js i.e. you can subscribe to multiple events with
  17536. * one call:
  17537. *
  17538. * lex.on("Identifier Number", function(data) {
  17539. * // ...
  17540. * });
  17541. */
  17542. on: function(names, listener) {
  17543. names.split(" ").forEach(function(name) {
  17544. this.emitter.on(name, listener);
  17545. }.bind(this));
  17546. },
  17547. /*
  17548. * Trigger a token event. All arguments will be passed to each
  17549. * listener.
  17550. */
  17551. trigger: function() {
  17552. this.emitter.emit.apply(this.emitter, Array.prototype.slice.call(arguments));
  17553. },
  17554. /*
  17555. * Postpone a token event. the checking condition is set as
  17556. * last parameter, and the trigger function is called in a
  17557. * stored callback. To be later called using the check() function
  17558. * by the parser. This avoids parser's peek() to give the lexer
  17559. * a false context.
  17560. */
  17561. triggerAsync: function(type, args, checks, fn) {
  17562. checks.push(function() {
  17563. if (fn()) {
  17564. this.trigger(type, args);
  17565. }
  17566. }.bind(this));
  17567. },
  17568. /*
  17569. * Extract a punctuator out of the next sequence of characters
  17570. * or return 'null' if its not possible.
  17571. *
  17572. * This method's implementation was heavily influenced by the
  17573. * scanPunctuator function in the Esprima parser's source code.
  17574. */
  17575. scanPunctuator: function() {
  17576. var ch1 = this.peek();
  17577. var ch2, ch3, ch4;
  17578. switch (ch1) {
  17579. // Most common single-character punctuators
  17580. case ".":
  17581. if ((/^[0-9]$/).test(this.peek(1))) {
  17582. return null;
  17583. }
  17584. if (this.peek(1) === "." && this.peek(2) === ".") {
  17585. return {
  17586. type: Token.Punctuator,
  17587. value: "..."
  17588. };
  17589. }
  17590. /* falls through */
  17591. case "(":
  17592. case ")":
  17593. case ";":
  17594. case ",":
  17595. case "[":
  17596. case "]":
  17597. case ":":
  17598. case "~":
  17599. return {
  17600. type: Token.Punctuator,
  17601. value: ch1
  17602. };
  17603. // A block/object opener
  17604. case "{":
  17605. this.pushContext(Context.Block);
  17606. return {
  17607. type: Token.Punctuator,
  17608. value: ch1
  17609. };
  17610. // A block/object closer
  17611. case "}":
  17612. if (this.inContext(Context.Block)) {
  17613. this.popContext();
  17614. }
  17615. return {
  17616. type: Token.Punctuator,
  17617. value: ch1
  17618. };
  17619. // A pound sign (for Node shebangs)
  17620. case "#":
  17621. return {
  17622. type: Token.Punctuator,
  17623. value: ch1
  17624. };
  17625. // We're at the end of input
  17626. case "":
  17627. return null;
  17628. }
  17629. // Peek more characters
  17630. ch2 = this.peek(1);
  17631. ch3 = this.peek(2);
  17632. if (ch1 === "?") {
  17633. // Optional chaining
  17634. if (ch2 === "." && !reg.decimalDigit.test(ch3)) {
  17635. return {
  17636. type: Token.Punctuator,
  17637. value: "?."
  17638. };
  17639. }
  17640. return {
  17641. type: Token.Punctuator,
  17642. value: ch2 === "?" ? "??" : "?"
  17643. };
  17644. }
  17645. ch4 = this.peek(3);
  17646. // 4-character punctuator: >>>=
  17647. if (ch1 === ">" && ch2 === ">" && ch3 === ">" && ch4 === "=") {
  17648. return {
  17649. type: Token.Punctuator,
  17650. value: ">>>="
  17651. };
  17652. }
  17653. // 3-character punctuators: === !== >>> <<= >>=
  17654. if (ch1 === "=" && ch2 === "=" && ch3 === "=") {
  17655. return {
  17656. type: Token.Punctuator,
  17657. value: "==="
  17658. };
  17659. }
  17660. if (ch1 === "!" && ch2 === "=" && ch3 === "=") {
  17661. return {
  17662. type: Token.Punctuator,
  17663. value: "!=="
  17664. };
  17665. }
  17666. if (ch1 === ">" && ch2 === ">" && ch3 === ">") {
  17667. return {
  17668. type: Token.Punctuator,
  17669. value: ">>>"
  17670. };
  17671. }
  17672. if (ch1 === "<" && ch2 === "<" && ch3 === "=") {
  17673. return {
  17674. type: Token.Punctuator,
  17675. value: "<<="
  17676. };
  17677. }
  17678. if (ch1 === ">" && ch2 === ">" && ch3 === "=") {
  17679. return {
  17680. type: Token.Punctuator,
  17681. value: ">>="
  17682. };
  17683. }
  17684. // Fat arrow punctuator
  17685. if (ch1 === "=" && ch2 === ">") {
  17686. return {
  17687. type: Token.Punctuator,
  17688. value: ch1 + ch2
  17689. };
  17690. }
  17691. // 2-character punctuators: ++ -- << >> && || **
  17692. if (ch1 === ch2 && ("+-<>&|*".indexOf(ch1) >= 0)) {
  17693. if (ch1 === "*" && ch3 === "=") {
  17694. return {
  17695. type: Token.Punctuator,
  17696. value: ch1 + ch2 + ch3
  17697. };
  17698. }
  17699. return {
  17700. type: Token.Punctuator,
  17701. value: ch1 + ch2
  17702. };
  17703. }
  17704. // <= >= != += -= *= %= &= |= ^= /=
  17705. if ("<>=!+-*%&|^/".indexOf(ch1) >= 0) {
  17706. if (ch2 === "=") {
  17707. return {
  17708. type: Token.Punctuator,
  17709. value: ch1 + ch2
  17710. };
  17711. }
  17712. return {
  17713. type: Token.Punctuator,
  17714. value: ch1
  17715. };
  17716. }
  17717. return null;
  17718. },
  17719. /*
  17720. * Extract a comment out of the next sequence of characters and/or
  17721. * lines or return 'null' if its not possible. Since comments can
  17722. * span across multiple lines this method has to move the char
  17723. * pointer.
  17724. *
  17725. * In addition to normal JavaScript comments (// and /*) this method
  17726. * also recognizes JSHint- and JSLint-specific comments such as
  17727. * /*jshint, /*jslint, /*globals and so on.
  17728. */
  17729. scanComments: function(checks) {
  17730. var ch1 = this.peek();
  17731. var ch2 = this.peek(1);
  17732. var rest = this.input.substr(2);
  17733. var startLine = this.line;
  17734. var startChar = this.char;
  17735. var self = this;
  17736. // Create a comment token object and make sure it
  17737. // has all the data JSHint needs to work with special
  17738. // comments.
  17739. function commentToken(label, body, opt) {
  17740. var special = [
  17741. "jshint", "jshint.unstable", "jslint", "members", "member", "globals",
  17742. "global", "exported"
  17743. ];
  17744. var isSpecial = false;
  17745. var value = label + body;
  17746. var commentType = "plain";
  17747. opt = opt || {};
  17748. if (opt.isMultiline) {
  17749. value += "*/";
  17750. }
  17751. body = body.replace(/\n/g, " ");
  17752. if (label === "/*" && reg.fallsThrough.test(body)) {
  17753. isSpecial = true;
  17754. commentType = "falls through";
  17755. }
  17756. special.forEach(function(str) {
  17757. if (isSpecial) {
  17758. return;
  17759. }
  17760. // Don't recognize any special comments other than jshint for single-line
  17761. // comments. This introduced many problems with legit comments.
  17762. if (label === "//" && str !== "jshint" && str !== "jshint.unstable") {
  17763. return;
  17764. }
  17765. if (body.charAt(str.length) === " " && body.substr(0, str.length) === str) {
  17766. isSpecial = true;
  17767. label = label + str;
  17768. body = body.substr(str.length);
  17769. }
  17770. if (!isSpecial && body.charAt(0) === " " && body.charAt(str.length + 1) === " " &&
  17771. body.substr(1, str.length) === str) {
  17772. isSpecial = true;
  17773. label = label + " " + str;
  17774. body = body.substr(str.length + 1);
  17775. }
  17776. // To handle rarer case when special word is separated from label by
  17777. // multiple spaces or tabs
  17778. var strIndex = body.indexOf(str);
  17779. if (!isSpecial && strIndex >= 0 && body.charAt(strIndex + str.length) === " ") {
  17780. var isAllWhitespace = body.substr(0, strIndex).trim().length === 0;
  17781. if (isAllWhitespace) {
  17782. isSpecial = true;
  17783. body = body.substr(str.length + strIndex);
  17784. }
  17785. }
  17786. if (!isSpecial) {
  17787. return;
  17788. }
  17789. switch (str) {
  17790. case "member":
  17791. commentType = "members";
  17792. break;
  17793. case "global":
  17794. commentType = "globals";
  17795. break;
  17796. default:
  17797. var options = body.split(":").map(function(v) {
  17798. return v.replace(/^\s+/, "").replace(/\s+$/, "");
  17799. });
  17800. if (options.length === 2) {
  17801. switch (options[0]) {
  17802. case "ignore":
  17803. switch (options[1]) {
  17804. case "start":
  17805. self.ignoringLinterErrors = true;
  17806. isSpecial = false;
  17807. break;
  17808. case "end":
  17809. self.ignoringLinterErrors = false;
  17810. isSpecial = false;
  17811. break;
  17812. }
  17813. }
  17814. }
  17815. commentType = str;
  17816. }
  17817. });
  17818. return {
  17819. type: Token.Comment,
  17820. commentType: commentType,
  17821. value: value,
  17822. body: body,
  17823. isSpecial: isSpecial,
  17824. isMalformed: opt.isMalformed || false
  17825. };
  17826. }
  17827. // End of unbegun comment. Raise an error and skip that input.
  17828. if (ch1 === "*" && ch2 === "/") {
  17829. this.trigger("error", {
  17830. code: "E018",
  17831. line: startLine,
  17832. character: startChar
  17833. });
  17834. this.skip(2);
  17835. return null;
  17836. }
  17837. // Comments must start either with // or /*
  17838. if (ch1 !== "/" || (ch2 !== "*" && ch2 !== "/")) {
  17839. return null;
  17840. }
  17841. // One-line comment
  17842. if (ch2 === "/") {
  17843. this.skip(this.input.length); // Skip to the EOL.
  17844. return commentToken("//", rest);
  17845. }
  17846. var body = "";
  17847. /* Multi-line comment */
  17848. if (ch2 === "*") {
  17849. this.inComment = true;
  17850. this.skip(2);
  17851. while (this.peek() !== "*" || this.peek(1) !== "/") {
  17852. if (this.peek() === "") { // End of Line
  17853. body += "\n";
  17854. // If we hit EOF and our comment is still unclosed,
  17855. // trigger an error and end the comment implicitly.
  17856. if (!this.nextLine(checks)) {
  17857. this.trigger("error", {
  17858. code: "E017",
  17859. line: startLine,
  17860. character: startChar
  17861. });
  17862. this.inComment = false;
  17863. return commentToken("/*", body, {
  17864. isMultiline: true,
  17865. isMalformed: true
  17866. });
  17867. }
  17868. } else {
  17869. body += this.peek();
  17870. this.skip();
  17871. }
  17872. }
  17873. this.skip(2);
  17874. this.inComment = false;
  17875. return commentToken("/*", body, { isMultiline: true });
  17876. }
  17877. },
  17878. /*
  17879. * Extract a keyword out of the next sequence of characters or
  17880. * return 'null' if its not possible.
  17881. */
  17882. scanKeyword: function() {
  17883. var result = /^[a-zA-Z_$][a-zA-Z0-9_$]*/.exec(this.input);
  17884. var keywords = [
  17885. "if", "in", "do", "var", "for", "new",
  17886. "try", "let", "this", "else", "case",
  17887. "void", "with", "enum", "while", "break",
  17888. "catch", "throw", "const", "yield", "class",
  17889. "super", "return", "typeof", "delete",
  17890. "switch", "export", "import", "default",
  17891. "finally", "extends", "function", "continue",
  17892. "debugger", "instanceof", "true", "false", "null", "async", "await"
  17893. ];
  17894. if (result && keywords.indexOf(result[0]) >= 0) {
  17895. return {
  17896. type: Token.Keyword,
  17897. value: result[0]
  17898. };
  17899. }
  17900. return null;
  17901. },
  17902. /*
  17903. * Extract a JavaScript identifier out of the next sequence of
  17904. * characters or return 'null' if its not possible.
  17905. */
  17906. scanIdentifier: function(checks) {
  17907. var id = "";
  17908. var index = 0;
  17909. var char, value;
  17910. function isNonAsciiIdentifierStart(code) {
  17911. return nonAsciiIdentifierStartTable.indexOf(code) > -1;
  17912. }
  17913. function isNonAsciiIdentifierPart(code) {
  17914. return isNonAsciiIdentifierStart(code) || nonAsciiIdentifierPartTable.indexOf(code) > -1;
  17915. }
  17916. var readUnicodeEscapeSequence = function() {
  17917. /*jshint validthis:true */
  17918. index += 1;
  17919. if (this.peek(index) !== "u") {
  17920. return null;
  17921. }
  17922. var sequence = this.peek(index + 1) + this.peek(index + 2) +
  17923. this.peek(index + 3) + this.peek(index + 4);
  17924. var code;
  17925. if (isHex(sequence)) {
  17926. code = parseInt(sequence, 16);
  17927. if (asciiIdentifierPartTable[code] || isNonAsciiIdentifierPart(code)) {
  17928. index += 5;
  17929. return "\\u" + sequence;
  17930. }
  17931. return null;
  17932. }
  17933. return null;
  17934. }.bind(this);
  17935. var getIdentifierStart = function() {
  17936. /*jshint validthis:true */
  17937. var chr = this.peek(index);
  17938. var code = chr.charCodeAt(0);
  17939. if (code === 92) {
  17940. return readUnicodeEscapeSequence();
  17941. }
  17942. if (code < 128) {
  17943. if (asciiIdentifierStartTable[code]) {
  17944. index += 1;
  17945. return chr;
  17946. }
  17947. return null;
  17948. }
  17949. if (isNonAsciiIdentifierStart(code)) {
  17950. index += 1;
  17951. return chr;
  17952. }
  17953. return null;
  17954. }.bind(this);
  17955. var getIdentifierPart = function() {
  17956. /*jshint validthis:true */
  17957. var chr = this.peek(index);
  17958. var code = chr.charCodeAt(0);
  17959. if (code === 92) {
  17960. return readUnicodeEscapeSequence();
  17961. }
  17962. if (code < 128) {
  17963. if (asciiIdentifierPartTable[code]) {
  17964. index += 1;
  17965. return chr;
  17966. }
  17967. return null;
  17968. }
  17969. if (isNonAsciiIdentifierPart(code)) {
  17970. index += 1;
  17971. return chr;
  17972. }
  17973. return null;
  17974. }.bind(this);
  17975. function removeEscapeSequences(id) {
  17976. return id.replace(/\\u([0-9a-fA-F]{4})/g, function(m0, codepoint) {
  17977. return String.fromCharCode(parseInt(codepoint, 16));
  17978. });
  17979. }
  17980. char = getIdentifierStart();
  17981. if (char === null) {
  17982. return null;
  17983. }
  17984. id = char;
  17985. for (;;) {
  17986. char = getIdentifierPart();
  17987. if (char === null) {
  17988. break;
  17989. }
  17990. id += char;
  17991. }
  17992. value = removeEscapeSequences(id);
  17993. if (!state.inES6(true)) {
  17994. es5IdentifierNames = require("../data/es5-identifier-names.js");
  17995. if (!es5IdentifierNames.test(value)) {
  17996. this.triggerAsync(
  17997. "warning",
  17998. {
  17999. code: "W119",
  18000. line: this.line,
  18001. character: this.char,
  18002. data: ["unicode 8", "6"]
  18003. },
  18004. checks,
  18005. function() { return true; }
  18006. );
  18007. }
  18008. }
  18009. return {
  18010. type: Token.Identifier,
  18011. value: value,
  18012. text: id,
  18013. tokenLength: id.length
  18014. };
  18015. },
  18016. /*
  18017. * Extract a numeric literal out of the next sequence of
  18018. * characters or return 'null' if its not possible. This method
  18019. * supports all numeric literals described in section 7.8.3
  18020. * of the EcmaScript 5 specification.
  18021. *
  18022. * This method's implementation was heavily influenced by the
  18023. * scanNumericLiteral function in the Esprima parser's source code.
  18024. */
  18025. scanNumericLiteral: function(checks) {
  18026. var index = 0;
  18027. var value = "";
  18028. var length = this.input.length;
  18029. var char = this.peek(index);
  18030. var isAllowedDigit = isDecimalDigit;
  18031. var base = 10;
  18032. var isLegacy = false;
  18033. var isNonOctal = false;
  18034. function isDecimalDigit(str) {
  18035. return (/^[0-9]$/).test(str);
  18036. }
  18037. function isOctalDigit(str) {
  18038. return (/^[0-7]$/).test(str);
  18039. }
  18040. function isNonOctalDigit(str) {
  18041. return str === "8" || str === "9";
  18042. }
  18043. function isBinaryDigit(str) {
  18044. return (/^[01]$/).test(str);
  18045. }
  18046. function isIdentifierStart(ch) {
  18047. return (ch === "$") || (ch === "_") || (ch === "\\") ||
  18048. (ch >= "a" && ch <= "z") || (ch >= "A" && ch <= "Z");
  18049. }
  18050. // Numbers must start either with a decimal digit or a point.
  18051. if (char !== "." && !isDecimalDigit(char)) {
  18052. return null;
  18053. }
  18054. if (char !== ".") {
  18055. value = this.peek(index);
  18056. index += 1;
  18057. char = this.peek(index);
  18058. if (value === "0") {
  18059. // Base-16 numbers.
  18060. if (char === "x" || char === "X") {
  18061. isAllowedDigit = isHexDigit;
  18062. base = 16;
  18063. index += 1;
  18064. value += char;
  18065. }
  18066. // Base-8 numbers.
  18067. if (char === "o" || char === "O") {
  18068. isAllowedDigit = isOctalDigit;
  18069. base = 8;
  18070. if (!state.inES6(true)) {
  18071. this.triggerAsync(
  18072. "warning",
  18073. {
  18074. code: "W119",
  18075. line: this.line,
  18076. character: this.char,
  18077. data: [ "Octal integer literal", "6" ]
  18078. },
  18079. checks,
  18080. function() { return true; }
  18081. );
  18082. }
  18083. index += 1;
  18084. value += char;
  18085. }
  18086. // Base-2 numbers.
  18087. if (char === "b" || char === "B") {
  18088. isAllowedDigit = isBinaryDigit;
  18089. base = 2;
  18090. if (!state.inES6(true)) {
  18091. this.triggerAsync(
  18092. "warning",
  18093. {
  18094. code: "W119",
  18095. line: this.line,
  18096. character: this.char,
  18097. data: [ "Binary integer literal", "6" ]
  18098. },
  18099. checks,
  18100. function() { return true; }
  18101. );
  18102. }
  18103. index += 1;
  18104. value += char;
  18105. }
  18106. // Legacy base-8 numbers.
  18107. if (isOctalDigit(char)) {
  18108. isAllowedDigit = isOctalDigit;
  18109. base = 8;
  18110. isLegacy = true;
  18111. } else if (isDecimalDigit(char)) {
  18112. isNonOctal = true;
  18113. }
  18114. }
  18115. while (index < length) {
  18116. char = this.peek(index);
  18117. if (isLegacy && isNonOctalDigit(char)) {
  18118. base = 10;
  18119. isLegacy = false;
  18120. isNonOctal = true;
  18121. isAllowedDigit = isDecimalDigit;
  18122. }
  18123. if (!isAllowedDigit(char)) {
  18124. break;
  18125. }
  18126. value += char;
  18127. index += 1;
  18128. }
  18129. var isBigInt = this.peek(index) === 'n';
  18130. if (isAllowedDigit !== isDecimalDigit || isBigInt) {
  18131. if (isBigInt) {
  18132. this.triggerAsync(
  18133. "warning",
  18134. {
  18135. code: "W119",
  18136. line: this.line,
  18137. character: this.char,
  18138. data: [ "BigInt", "11" ]
  18139. },
  18140. checks,
  18141. function() { return !state.inES11(); }
  18142. );
  18143. if (isLegacy || isNonOctal) {
  18144. this.triggerAsync(
  18145. "error",
  18146. {
  18147. code: "E067",
  18148. line: this.line,
  18149. character: this.char,
  18150. data: [value + char]
  18151. },
  18152. checks,
  18153. function() { return true; }
  18154. );
  18155. }
  18156. value += char;
  18157. index += 1;
  18158. } else if (!isLegacy && value.length <= 2) { // 0x
  18159. return {
  18160. type: Token.NumericLiteral,
  18161. value: value,
  18162. isMalformed: true
  18163. };
  18164. }
  18165. if (index < length) {
  18166. char = this.peek(index);
  18167. if (isIdentifierStart(char)) {
  18168. return null;
  18169. }
  18170. }
  18171. return {
  18172. type: Token.NumericLiteral,
  18173. value: value,
  18174. base: base,
  18175. isLegacy: isLegacy,
  18176. isMalformed: false
  18177. };
  18178. }
  18179. }
  18180. // Decimal digits.
  18181. if (char === ".") {
  18182. value += char;
  18183. index += 1;
  18184. while (index < length) {
  18185. char = this.peek(index);
  18186. if (!isDecimalDigit(char)) {
  18187. break;
  18188. }
  18189. value += char;
  18190. index += 1;
  18191. }
  18192. }
  18193. // Exponent part.
  18194. if (char === "e" || char === "E") {
  18195. value += char;
  18196. index += 1;
  18197. char = this.peek(index);
  18198. if (char === "+" || char === "-") {
  18199. value += this.peek(index);
  18200. index += 1;
  18201. }
  18202. char = this.peek(index);
  18203. if (isDecimalDigit(char)) {
  18204. value += char;
  18205. index += 1;
  18206. while (index < length) {
  18207. char = this.peek(index);
  18208. if (!isDecimalDigit(char)) {
  18209. break;
  18210. }
  18211. value += char;
  18212. index += 1;
  18213. }
  18214. } else {
  18215. return null;
  18216. }
  18217. }
  18218. if (index < length) {
  18219. char = this.peek(index);
  18220. if (isIdentifierStart(char)) {
  18221. return null;
  18222. }
  18223. }
  18224. // TODO: Extend this check to other numeric literals
  18225. this.triggerAsync("warning", {
  18226. code: "W045",
  18227. line: this.line,
  18228. character: this.char + value.length,
  18229. data: [ value ]
  18230. }, checks, function() { return !isFinite(value); });
  18231. return {
  18232. type: Token.NumericLiteral,
  18233. value: value,
  18234. base: base,
  18235. isNonOctal: isNonOctal,
  18236. isMalformed: false
  18237. };
  18238. },
  18239. // Assumes previously parsed character was \ (=== '\\') and was not skipped.
  18240. scanEscapeSequence: function(checks) {
  18241. var allowNewLine = false;
  18242. var jump = 1;
  18243. this.skip();
  18244. var char = this.peek();
  18245. switch (char) {
  18246. case "'":
  18247. this.triggerAsync("warning", {
  18248. code: "W114",
  18249. line: this.line,
  18250. character: this.char,
  18251. data: [ "\\'" ]
  18252. }, checks, function() {return state.jsonMode; });
  18253. break;
  18254. case "b":
  18255. char = "\\b";
  18256. break;
  18257. case "f":
  18258. char = "\\f";
  18259. break;
  18260. case "n":
  18261. char = "\\n";
  18262. break;
  18263. case "r":
  18264. char = "\\r";
  18265. break;
  18266. case "t":
  18267. char = "\\t";
  18268. break;
  18269. case "0":
  18270. char = "\\0";
  18271. // Octal literals fail in strict mode.
  18272. // Check if the number is between 00 and 07.
  18273. var n = parseInt(this.peek(1), 10);
  18274. this.triggerAsync("warning", {
  18275. code: "W115",
  18276. line: this.line,
  18277. character: this.char
  18278. }, checks,
  18279. function() { return n >= 0 && n <= 7 && state.isStrict(); });
  18280. break;
  18281. case "1":
  18282. case "2":
  18283. case "3":
  18284. case "4":
  18285. case "5":
  18286. case "6":
  18287. case "7":
  18288. char = "\\" + char;
  18289. this.triggerAsync("warning", {
  18290. code: "W115",
  18291. line: this.line,
  18292. character: this.char
  18293. }, checks,
  18294. function() { return state.isStrict(); });
  18295. break;
  18296. case "u":
  18297. var sequence = this.input.substr(1, 4);
  18298. var code = parseInt(sequence, 16);
  18299. if (!isHex(sequence)) {
  18300. // This condition unequivocally describes a syntax error.
  18301. // TODO: Re-factor as an "error" (not a "warning").
  18302. this.trigger("warning", {
  18303. code: "W052",
  18304. line: this.line,
  18305. character: this.char,
  18306. data: [ "u" + sequence ]
  18307. });
  18308. }
  18309. char = String.fromCharCode(code);
  18310. jump = 5;
  18311. break;
  18312. case "v":
  18313. this.triggerAsync("warning", {
  18314. code: "W114",
  18315. line: this.line,
  18316. character: this.char,
  18317. data: [ "\\v" ]
  18318. }, checks, function() { return state.jsonMode; });
  18319. char = "\v";
  18320. break;
  18321. case "x":
  18322. var x = parseInt(this.input.substr(1, 2), 16);
  18323. this.triggerAsync("warning", {
  18324. code: "W114",
  18325. line: this.line,
  18326. character: this.char,
  18327. data: [ "\\x-" ]
  18328. }, checks, function() { return state.jsonMode; });
  18329. char = String.fromCharCode(x);
  18330. jump = 3;
  18331. break;
  18332. case "\\":
  18333. char = "\\\\";
  18334. break;
  18335. case "/":
  18336. break;
  18337. case "":
  18338. allowNewLine = true;
  18339. char = "";
  18340. break;
  18341. }
  18342. return { char: char, jump: jump, allowNewLine: allowNewLine };
  18343. },
  18344. /*
  18345. * Extract a template literal out of the next sequence of characters
  18346. * and/or lines or return 'null' if its not possible. Since template
  18347. * literals can span across multiple lines, this method has to move
  18348. * the char pointer.
  18349. */
  18350. scanTemplateLiteral: function(checks) {
  18351. var tokenType;
  18352. var value = "";
  18353. var ch;
  18354. var startLine = this.line;
  18355. var startChar = this.char;
  18356. var depth = this.templateStarts.length;
  18357. if (this.peek() === "`") {
  18358. if (!state.inES6(true)) {
  18359. this.triggerAsync(
  18360. "warning",
  18361. {
  18362. code: "W119",
  18363. line: this.line,
  18364. character: this.char,
  18365. data: ["template literal syntax", "6"]
  18366. },
  18367. checks,
  18368. function() { return true; }
  18369. );
  18370. }
  18371. // Template must start with a backtick.
  18372. tokenType = Token.TemplateHead;
  18373. this.templateStarts.push({ line: this.line, char: this.char });
  18374. depth = this.templateStarts.length;
  18375. this.skip(1);
  18376. this.pushContext(Context.Template);
  18377. } else if (this.inContext(Context.Template) && this.peek() === "}") {
  18378. // If we're in a template context, and we have a '}', lex a TemplateMiddle.
  18379. tokenType = Token.TemplateMiddle;
  18380. } else {
  18381. // Go lex something else.
  18382. return null;
  18383. }
  18384. while (this.peek() !== "`") {
  18385. while ((ch = this.peek()) === "") {
  18386. value += "\n";
  18387. if (!this.nextLine(checks)) {
  18388. // Unclosed template literal --- point to the starting "`"
  18389. var startPos = this.templateStarts.pop();
  18390. this.trigger("error", {
  18391. code: "E052",
  18392. line: startPos.line,
  18393. character: startPos.char
  18394. });
  18395. return {
  18396. type: tokenType,
  18397. value: value,
  18398. startLine: startLine,
  18399. startChar: startChar,
  18400. isUnclosed: true,
  18401. depth: depth,
  18402. context: this.popContext()
  18403. };
  18404. }
  18405. }
  18406. if (ch === '$' && this.peek(1) === '{') {
  18407. value += '${';
  18408. this.skip(2);
  18409. return {
  18410. type: tokenType,
  18411. value: value,
  18412. startLine: startLine,
  18413. startChar: startChar,
  18414. isUnclosed: false,
  18415. depth: depth,
  18416. context: this.currentContext()
  18417. };
  18418. } else if (ch === '\\') {
  18419. var escape = this.scanEscapeSequence(checks);
  18420. value += escape.char;
  18421. this.skip(escape.jump);
  18422. } else if (ch !== '`') {
  18423. // Otherwise, append the value and continue.
  18424. value += ch;
  18425. this.skip(1);
  18426. }
  18427. }
  18428. // Final value is either NoSubstTemplate or TemplateTail
  18429. tokenType = tokenType === Token.TemplateHead ? Token.NoSubstTemplate : Token.TemplateTail;
  18430. this.skip(1);
  18431. this.templateStarts.pop();
  18432. return {
  18433. type: tokenType,
  18434. value: value,
  18435. startLine: startLine,
  18436. startChar: startChar,
  18437. isUnclosed: false,
  18438. depth: depth,
  18439. context: this.popContext()
  18440. };
  18441. },
  18442. /*
  18443. * Extract a string out of the next sequence of characters and/or
  18444. * lines or return 'null' if its not possible. Since strings can
  18445. * span across multiple lines this method has to move the char
  18446. * pointer.
  18447. *
  18448. * This method recognizes pseudo-multiline JavaScript strings:
  18449. *
  18450. * var str = "hello\
  18451. * world";
  18452. */
  18453. scanStringLiteral: function(checks) {
  18454. /*jshint loopfunc:true */
  18455. var quote = this.peek();
  18456. // String must start with a quote.
  18457. if (quote !== "\"" && quote !== "'") {
  18458. return null;
  18459. }
  18460. // In JSON strings must always use double quotes.
  18461. this.triggerAsync("warning", {
  18462. code: "W108",
  18463. line: this.line,
  18464. character: this.char // +1?
  18465. }, checks, function() { return state.jsonMode && quote !== "\""; });
  18466. var value = "";
  18467. var startLine = this.line;
  18468. var startChar = this.char;
  18469. var allowNewLine = false;
  18470. this.skip();
  18471. while (this.peek() !== quote) {
  18472. if (this.peek() === "") { // End Of Line
  18473. // If an EOL is not preceded by a backslash, show a warning
  18474. // and proceed like it was a legit multi-line string where
  18475. // author simply forgot to escape the newline symbol.
  18476. //
  18477. // Another approach is to implicitly close a string on EOL
  18478. // but it generates too many false positives.
  18479. if (!allowNewLine) {
  18480. // This condition unequivocally describes a syntax error.
  18481. // TODO: Emit error E029 and remove W112.
  18482. this.trigger("warning", {
  18483. code: "W112",
  18484. line: this.line,
  18485. character: this.char
  18486. });
  18487. } else {
  18488. allowNewLine = false;
  18489. // Otherwise show a warning if multistr option was not set.
  18490. // For JSON, show warning no matter what.
  18491. this.triggerAsync("warning", {
  18492. code: "W043",
  18493. line: this.line,
  18494. character: this.char
  18495. }, checks, function() { return !state.option.multistr; });
  18496. this.triggerAsync("warning", {
  18497. code: "W042",
  18498. line: this.line,
  18499. character: this.char
  18500. }, checks, function() { return state.jsonMode && state.option.multistr; });
  18501. }
  18502. // If we get an EOF inside of an unclosed string, show an
  18503. // error and implicitly close it at the EOF point.
  18504. if (!this.nextLine(checks)) {
  18505. return {
  18506. type: Token.StringLiteral,
  18507. value: value,
  18508. startLine: startLine,
  18509. startChar: startChar,
  18510. isUnclosed: true,
  18511. quote: quote
  18512. };
  18513. }
  18514. } else { // Any character other than End Of Line
  18515. allowNewLine = false;
  18516. var char = this.peek();
  18517. var jump = 1; // A length of a jump, after we're done
  18518. // parsing this character.
  18519. if (char < " ") {
  18520. // Warn about a control character in a string.
  18521. this.triggerAsync(
  18522. "warning",
  18523. {
  18524. code: "W113",
  18525. line: this.line,
  18526. character: this.char,
  18527. data: [ "<non-printable>" ]
  18528. },
  18529. checks,
  18530. function() { return true; }
  18531. );
  18532. }
  18533. // Special treatment for some escaped characters.
  18534. if (char === "\\") {
  18535. var parsed = this.scanEscapeSequence(checks);
  18536. char = parsed.char;
  18537. jump = parsed.jump;
  18538. allowNewLine = parsed.allowNewLine;
  18539. }
  18540. // If char is the empty string, end of the line has been reached. In
  18541. // this case, `this.char` should not be incremented so that warnings
  18542. // and errors reported in the subsequent loop iteration have the
  18543. // correct character column offset.
  18544. if (char !== "") {
  18545. value += char;
  18546. this.skip(jump);
  18547. }
  18548. }
  18549. }
  18550. this.skip();
  18551. return {
  18552. type: Token.StringLiteral,
  18553. value: value,
  18554. startLine: startLine,
  18555. startChar: startChar,
  18556. isUnclosed: false,
  18557. quote: quote
  18558. };
  18559. },
  18560. /*
  18561. * Extract a regular expression out of the next sequence of
  18562. * characters and/or lines or return 'null' if its not possible.
  18563. *
  18564. * This method is platform dependent: it accepts almost any
  18565. * regular expression values but then tries to compile and run
  18566. * them using system's RegExp object. This means that there are
  18567. * rare edge cases where one JavaScript engine complains about
  18568. * your regular expression while others don't.
  18569. */
  18570. scanRegExp: function(checks) {
  18571. var index = 0;
  18572. var length = this.input.length;
  18573. var char = this.peek();
  18574. var value = char;
  18575. var body = "";
  18576. var groupReferences = [];
  18577. var allFlags = "";
  18578. var es5Flags = "";
  18579. var malformed = false;
  18580. var isCharSet = false;
  18581. var isCharSetRange = false;
  18582. var isGroup = false;
  18583. var isQuantifiable = false;
  18584. var hasInvalidQuantifier = false;
  18585. var escapedChars = "";
  18586. var hasUFlag = function() { return allFlags.indexOf("u") > -1; };
  18587. var escapeSequence;
  18588. var groupCount = 0;
  18589. var terminated, malformedDesc;
  18590. var scanRegexpEscapeSequence = function() {
  18591. var next, sequence;
  18592. index += 1;
  18593. char = this.peek(index);
  18594. if (reg.nonzeroDigit.test(char)) {
  18595. sequence = char;
  18596. next = this.peek(index + 1);
  18597. while (reg.nonzeroDigit.test(next) || next === "0") {
  18598. index += 1;
  18599. char = next;
  18600. sequence += char;
  18601. body += char;
  18602. value += char;
  18603. next = this.peek(index + 1);
  18604. }
  18605. groupReferences.push(Number(sequence));
  18606. return sequence;
  18607. }
  18608. escapedChars += char;
  18609. if (char === "u" && this.peek(index + 1) === "{") {
  18610. var x = index + 2;
  18611. sequence = "u{";
  18612. next = this.peek(x);
  18613. while (isHex(next)) {
  18614. sequence += next;
  18615. x += 1;
  18616. next = this.peek(x);
  18617. }
  18618. if (next !== "}") {
  18619. this.triggerAsync(
  18620. "error",
  18621. {
  18622. code: "E016",
  18623. line: this.line,
  18624. character: this.char,
  18625. data: [ "Invalid Unicode escape sequence" ]
  18626. },
  18627. checks,
  18628. hasUFlag
  18629. );
  18630. } else if (sequence.length > 2) {
  18631. sequence += "}";
  18632. body += sequence;
  18633. value += sequence;
  18634. index = x + 1;
  18635. return sequence;
  18636. }
  18637. }
  18638. if (char === "p" || char === "P") {
  18639. var y = index + 2;
  18640. sequence = "";
  18641. next = "";
  18642. if (this.peek(index + 1) === "{") {
  18643. next = this.peek(y);
  18644. while (next && next !== "}") {
  18645. sequence += next;
  18646. y += 1;
  18647. next = this.peek(y);
  18648. }
  18649. }
  18650. // Module loading is intentionally deferred as an optimization for
  18651. // Node.js users who do not use Unicode escape sequences.
  18652. if (!sequence || !require("./validate-unicode-escape-sequence")(sequence)) {
  18653. this.triggerAsync(
  18654. "error",
  18655. {
  18656. code: "E016",
  18657. line: this.line,
  18658. character: this.char,
  18659. data: [ "Invalid Unicode property escape sequence" ]
  18660. },
  18661. checks,
  18662. hasUFlag
  18663. );
  18664. }
  18665. if (sequence) {
  18666. sequence = char + "{" + sequence + "}";
  18667. body += sequence;
  18668. value += sequence;
  18669. index = y + 1;
  18670. if (!state.inES9()) {
  18671. this.triggerAsync(
  18672. "warning",
  18673. {
  18674. code: "W119",
  18675. line: this.line,
  18676. character: this.char,
  18677. data: [ "Unicode property escape", "9" ]
  18678. },
  18679. checks,
  18680. hasUFlag
  18681. );
  18682. }
  18683. return sequence;
  18684. }
  18685. }
  18686. // Unexpected control character
  18687. if (char < " ") {
  18688. malformed = true;
  18689. this.triggerAsync(
  18690. "warning",
  18691. {
  18692. code: "W048",
  18693. line: this.line,
  18694. character: this.char
  18695. },
  18696. checks,
  18697. function() { return true; }
  18698. );
  18699. }
  18700. // Unexpected escaped character
  18701. if (char === "<") {
  18702. malformed = true;
  18703. this.triggerAsync(
  18704. "warning",
  18705. {
  18706. code: "W049",
  18707. line: this.line,
  18708. character: this.char,
  18709. data: [ char ]
  18710. },
  18711. checks,
  18712. function() { return true; }
  18713. );
  18714. } else if (char === "0" && reg.decimalDigit.test(this.peek(index + 1))) {
  18715. this.triggerAsync(
  18716. "error",
  18717. {
  18718. code: "E016",
  18719. line: this.line,
  18720. character: this.char,
  18721. data: [ "Invalid decimal escape sequence" ]
  18722. },
  18723. checks,
  18724. hasUFlag
  18725. );
  18726. }
  18727. index += 1;
  18728. body += char;
  18729. value += char;
  18730. return char;
  18731. }.bind(this);
  18732. var checkQuantifier = function() {
  18733. var lookahead = index;
  18734. var lowerBound = "";
  18735. var upperBound = "";
  18736. var next;
  18737. next = this.peek(lookahead + 1);
  18738. while (reg.decimalDigit.test(next)) {
  18739. lookahead += 1;
  18740. lowerBound += next;
  18741. next = this.peek(lookahead + 1);
  18742. }
  18743. if (!lowerBound) {
  18744. return false;
  18745. }
  18746. if (next === "}") {
  18747. return true;
  18748. }
  18749. if (next !== ",") {
  18750. return false;
  18751. }
  18752. lookahead += 1;
  18753. next = this.peek(lookahead + 1);
  18754. while (reg.decimalDigit.test(next)) {
  18755. lookahead += 1;
  18756. upperBound += next;
  18757. next = this.peek(lookahead + 1);
  18758. }
  18759. if (next !== "}") {
  18760. return false;
  18761. }
  18762. if (upperBound) {
  18763. return Number(lowerBound) <= Number(upperBound);
  18764. }
  18765. return true;
  18766. }.bind(this);
  18767. var translateUFlag = function(body) {
  18768. // The BMP character to use as a replacement for astral symbols when
  18769. // translating an ES6 "u"-flagged pattern to an ES5-compatible
  18770. // approximation.
  18771. // Note: replacing with '\uFFFF' enables false positives in unlikely
  18772. // scenarios. For example, `[\u{1044f}-\u{10440}]` is an invalid pattern
  18773. // that would not be detected by this substitution.
  18774. var astralSubstitute = "\uFFFF";
  18775. return body
  18776. // Replace every Unicode escape sequence with the equivalent BMP
  18777. // character or a constant ASCII code point in the case of astral
  18778. // symbols. (See the above note on `astralSubstitute` for more
  18779. // information.)
  18780. .replace(/\\u\{([0-9a-fA-F]+)\}|\\u([a-fA-F0-9]{4})/g, function($0, $1, $2) {
  18781. var codePoint = parseInt($1 || $2, 16);
  18782. var literal;
  18783. if (codePoint > 0x10FFFF) {
  18784. malformed = true;
  18785. this.trigger("error", {
  18786. code: "E016",
  18787. line: this.line,
  18788. character: this.char,
  18789. data: [ char ]
  18790. });
  18791. return;
  18792. }
  18793. literal = String.fromCharCode(codePoint);
  18794. if (reg.regexpSyntaxChars.test(literal)) {
  18795. return $0;
  18796. }
  18797. if (codePoint <= 0xFFFF) {
  18798. return String.fromCharCode(codePoint);
  18799. }
  18800. return astralSubstitute;
  18801. }.bind(this))
  18802. // Replace each paired surrogate with a single ASCII symbol to avoid
  18803. // throwing on regular expressions that are only valid in combination
  18804. // with the "u" flag.
  18805. .replace(
  18806. /[\uD800-\uDBFF][\uDC00-\uDFFF]/g,
  18807. astralSubstitute
  18808. );
  18809. }.bind(this);
  18810. // Regular expressions must start with '/'
  18811. if (!this.prereg || char !== "/") {
  18812. return null;
  18813. }
  18814. index += 1;
  18815. terminated = false;
  18816. // Try to get everything in between slashes. A couple of
  18817. // cases aside (see scanRegexpEscapeSequence) we don't really
  18818. // care whether the resulting expression is valid or not.
  18819. // We will check that later using the RegExp object.
  18820. while (index < length) {
  18821. // Because an iteration of this loop may terminate in a number of
  18822. // distinct locations, `isCharSetRange` is re-set at the onset of
  18823. // iteration.
  18824. isCharSetRange &= char === "-";
  18825. char = this.peek(index);
  18826. value += char;
  18827. body += char;
  18828. if (isCharSet) {
  18829. if (char === "]") {
  18830. if (this.peek(index - 1) !== "\\" || this.peek(index - 2) === "\\") {
  18831. isCharSet = false;
  18832. }
  18833. } else if (char === "-") {
  18834. isCharSetRange = true;
  18835. }
  18836. }
  18837. if (char === "\\") {
  18838. escapeSequence = scanRegexpEscapeSequence();
  18839. if (isCharSet && (this.peek(index) === "-" || isCharSetRange) &&
  18840. reg.regexpCharClasses.test(escapeSequence)) {
  18841. this.triggerAsync(
  18842. "error",
  18843. {
  18844. code: "E016",
  18845. line: this.line,
  18846. character: this.char,
  18847. data: [ "Character class used in range" ]
  18848. },
  18849. checks,
  18850. hasUFlag
  18851. );
  18852. }
  18853. continue;
  18854. }
  18855. if (isCharSet) {
  18856. index += 1;
  18857. continue;
  18858. }
  18859. if (char === "{" && !hasInvalidQuantifier) {
  18860. hasInvalidQuantifier = !checkQuantifier();
  18861. }
  18862. if (char === "[") {
  18863. isCharSet = true;
  18864. index += 1;
  18865. continue;
  18866. } else if (char === "(") {
  18867. isGroup = true;
  18868. if (this.peek(index + 1) === "?" &&
  18869. (this.peek(index + 2) === "=" || this.peek(index + 2) === "!")) {
  18870. isQuantifiable = true;
  18871. }
  18872. } else if (char === ")") {
  18873. if (isQuantifiable) {
  18874. isQuantifiable = false;
  18875. if (reg.regexpQuantifiers.test(this.peek(index + 1))) {
  18876. this.triggerAsync(
  18877. "error",
  18878. {
  18879. code: "E016",
  18880. line: this.line,
  18881. character: this.char,
  18882. data: [ "Quantified quantifiable" ]
  18883. },
  18884. checks,
  18885. hasUFlag
  18886. );
  18887. }
  18888. } else {
  18889. groupCount += 1;
  18890. }
  18891. isGroup = false;
  18892. } else if (char === "/") {
  18893. body = body.substr(0, body.length - 1);
  18894. terminated = true;
  18895. index += 1;
  18896. break;
  18897. }
  18898. index += 1;
  18899. }
  18900. // A regular expression that was never closed is an
  18901. // error from which we cannot recover.
  18902. if (!terminated) {
  18903. this.trigger("error", {
  18904. code: "E015",
  18905. line: this.line,
  18906. character: this.from
  18907. });
  18908. return void this.trigger("fatal", {
  18909. line: this.line,
  18910. from: this.from
  18911. });
  18912. }
  18913. // Parse flags (if any).
  18914. while (index < length) {
  18915. char = this.peek(index);
  18916. if (!/[gimyus]/.test(char)) {
  18917. break;
  18918. }
  18919. if (char === "y") {
  18920. if (!state.inES6(true)) {
  18921. this.triggerAsync(
  18922. "warning",
  18923. {
  18924. code: "W119",
  18925. line: this.line,
  18926. character: this.char,
  18927. data: [ "Sticky RegExp flag", "6" ]
  18928. },
  18929. checks,
  18930. function() { return true; }
  18931. );
  18932. }
  18933. } else if (char === "u") {
  18934. if (!state.inES6(true)) {
  18935. this.triggerAsync(
  18936. "warning",
  18937. {
  18938. code: "W119",
  18939. line: this.line,
  18940. character: this.char,
  18941. data: [ "Unicode RegExp flag", "6" ]
  18942. },
  18943. checks,
  18944. function() { return true; }
  18945. );
  18946. }
  18947. var hasInvalidEscape = (function(groupReferences, groupCount, escapedChars, reg) {
  18948. var hasInvalidGroup = groupReferences.some(function(groupReference) {
  18949. if (groupReference > groupCount) {
  18950. return true;
  18951. }
  18952. });
  18953. if (hasInvalidGroup) {
  18954. return true;
  18955. }
  18956. return !escapedChars.split("").every(function(escapedChar) {
  18957. return escapedChar === "u" ||
  18958. escapedChar === "/" ||
  18959. escapedChar === "0" ||
  18960. reg.regexpControlEscapes.test(escapedChar) ||
  18961. reg.regexpCharClasses.test(escapedChar) ||
  18962. reg.regexpSyntaxChars.test(escapedChar);
  18963. });
  18964. }(groupReferences, groupCount, escapedChars, reg));
  18965. if (hasInvalidEscape) {
  18966. malformedDesc = "Invalid escape";
  18967. } else if (hasInvalidQuantifier) {
  18968. malformedDesc = "Invalid quantifier";
  18969. }
  18970. body = translateUFlag(body);
  18971. } else if (char === "s") {
  18972. if (!state.inES9()) {
  18973. this.triggerAsync(
  18974. "warning",
  18975. {
  18976. code: "W119",
  18977. line: this.line,
  18978. character: this.char,
  18979. data: [ "DotAll RegExp flag", "9" ]
  18980. },
  18981. checks,
  18982. function() { return true; }
  18983. );
  18984. }
  18985. if (value.indexOf("s") > -1) {
  18986. malformedDesc = "Duplicate RegExp flag";
  18987. }
  18988. } else {
  18989. es5Flags += char;
  18990. }
  18991. if (allFlags.indexOf(char) > -1) {
  18992. malformedDesc = "Duplicate RegExp flag";
  18993. }
  18994. allFlags += char;
  18995. value += char;
  18996. allFlags += char;
  18997. index += 1;
  18998. }
  18999. if (allFlags.indexOf("u") === -1) {
  19000. this.triggerAsync("warning", {
  19001. code: "W147",
  19002. line: this.line,
  19003. character: this.char
  19004. }, checks, function() { return state.option.regexpu; });
  19005. }
  19006. // Check regular expression for correctness.
  19007. try {
  19008. new RegExp(body, es5Flags);
  19009. } catch (err) {
  19010. /**
  19011. * Because JSHint relies on the current engine's RegExp parser to
  19012. * validate RegExp literals, the description (exposed as the "data"
  19013. * property on the error object) is platform dependent.
  19014. */
  19015. malformedDesc = err.message;
  19016. }
  19017. if (malformedDesc) {
  19018. malformed = true;
  19019. this.trigger("error", {
  19020. code: "E016",
  19021. line: this.line,
  19022. character: this.char,
  19023. data: [ malformedDesc ]
  19024. });
  19025. } else if (allFlags.indexOf("s") > -1 && !reg.regexpDot.test(body)) {
  19026. this.trigger("warning", {
  19027. code: "W148",
  19028. line: this.line,
  19029. character: this.char
  19030. });
  19031. }
  19032. return {
  19033. type: Token.RegExp,
  19034. value: value,
  19035. isMalformed: malformed
  19036. };
  19037. },
  19038. /*
  19039. * Scan for any occurrence of non-breaking spaces. Non-breaking spaces
  19040. * can be mistakenly typed on OS X with option-space. Non UTF-8 web
  19041. * pages with non-breaking pages produce syntax errors.
  19042. */
  19043. scanNonBreakingSpaces: function() {
  19044. return state.option.nonbsp ?
  19045. this.input.search(/(\u00A0)/) : -1;
  19046. },
  19047. /*
  19048. * Produce the next raw token or return 'null' if no tokens can be matched.
  19049. * This method skips over all space characters.
  19050. */
  19051. next: function(checks) {
  19052. this.from = this.char;
  19053. // Move to the next non-space character.
  19054. while (reg.whitespace.test(this.peek())) {
  19055. this.from += 1;
  19056. this.skip();
  19057. }
  19058. // Methods that work with multi-line structures and move the
  19059. // character pointer.
  19060. var match = this.scanComments(checks) ||
  19061. this.scanStringLiteral(checks) ||
  19062. this.scanTemplateLiteral(checks);
  19063. if (match) {
  19064. return match;
  19065. }
  19066. // Methods that don't move the character pointer.
  19067. match =
  19068. this.scanRegExp(checks) ||
  19069. this.scanPunctuator() ||
  19070. this.scanKeyword() ||
  19071. this.scanIdentifier(checks) ||
  19072. this.scanNumericLiteral(checks);
  19073. if (match) {
  19074. this.skip(match.tokenLength || match.value.length);
  19075. return match;
  19076. }
  19077. // No token could be matched, give up.
  19078. return null;
  19079. },
  19080. /*
  19081. * Switch to the next line and reset all char pointers. Once
  19082. * switched, this method also checks for other minor warnings.
  19083. */
  19084. nextLine: function(checks) {
  19085. var char;
  19086. if (this.line >= this.getLines().length) {
  19087. return false;
  19088. }
  19089. this.input = this.getLines()[this.line];
  19090. this.line += 1;
  19091. this.char = 1;
  19092. this.from = 1;
  19093. var inputTrimmed = this.input.trim();
  19094. var startsWith = function() {
  19095. return _.some(arguments, function(prefix) {
  19096. return inputTrimmed.indexOf(prefix) === 0;
  19097. });
  19098. };
  19099. var endsWith = function() {
  19100. return _.some(arguments, function(suffix) {
  19101. return inputTrimmed.indexOf(suffix, inputTrimmed.length - suffix.length) !== -1;
  19102. });
  19103. };
  19104. // If we are ignoring linter errors, replace the input with empty string
  19105. // if it doesn't already at least start or end a multi-line comment
  19106. if (this.ignoringLinterErrors === true) {
  19107. if (!startsWith("/*", "//") && !(this.inComment && endsWith("*/"))) {
  19108. this.input = "";
  19109. }
  19110. }
  19111. char = this.scanNonBreakingSpaces();
  19112. if (char >= 0) {
  19113. this.triggerAsync(
  19114. "warning",
  19115. { code: "W125", line: this.line, character: char + 1 },
  19116. checks,
  19117. function() { return true; }
  19118. );
  19119. }
  19120. this.input = this.input.replace(/\t/g, state.tab);
  19121. // If there is a limit on line length, warn when lines get too
  19122. // long.
  19123. if (!this.ignoringLinterErrors && state.option.maxlen &&
  19124. state.option.maxlen < this.input.length) {
  19125. var inComment = this.inComment ||
  19126. startsWith.call(inputTrimmed, "//") ||
  19127. startsWith.call(inputTrimmed, "/*");
  19128. var shouldTriggerError = !inComment || !reg.maxlenException.test(inputTrimmed);
  19129. if (shouldTriggerError) {
  19130. this.triggerAsync(
  19131. "warning",
  19132. { code: "W101", line: this.line, character: this.input.length },
  19133. checks,
  19134. function() { return true; }
  19135. );
  19136. }
  19137. }
  19138. return true;
  19139. },
  19140. /*
  19141. * Produce the next token. This function is called by advance() to get
  19142. * the next token. It returns a token in a JSLint-compatible format.
  19143. */
  19144. token: function() {
  19145. /*jshint loopfunc:true */
  19146. var checks = asyncTrigger();
  19147. var token;
  19148. // Produce a token object.
  19149. var create = function(type, value, isProperty, token) {
  19150. /*jshint validthis:true */
  19151. var obj;
  19152. if (type !== "(endline)" && type !== "(end)") {
  19153. this.prereg = false;
  19154. }
  19155. if (type === "(punctuator)") {
  19156. switch (value) {
  19157. case ".":
  19158. case ")":
  19159. case "~":
  19160. case "#":
  19161. case "]":
  19162. case "}":
  19163. case "++":
  19164. case "--":
  19165. this.prereg = false;
  19166. break;
  19167. default:
  19168. this.prereg = true;
  19169. }
  19170. obj = Object.create(state.syntax[value] || state.syntax["(error)"]);
  19171. }
  19172. if (type === "(identifier)") {
  19173. if (value === "return" || value === "case" || value === "yield" ||
  19174. value === "typeof" || value === "instanceof" || value === "void" ||
  19175. value === "await" || value === "new" || value === "delete" ||
  19176. value === "default" || value === "extends") {
  19177. this.prereg = true;
  19178. }
  19179. if (_.has(state.syntax, value)) {
  19180. obj = Object.create(state.syntax[value] || state.syntax["(error)"]);
  19181. }
  19182. }
  19183. if (type === "(template)" || type === "(template middle)") {
  19184. this.prereg = true;
  19185. }
  19186. if (!obj) {
  19187. obj = Object.create(state.syntax[type]);
  19188. }
  19189. obj.identifier = (type === "(identifier)");
  19190. obj.type = obj.type || type;
  19191. obj.value = value;
  19192. obj.line = this.line;
  19193. obj.character = this.char;
  19194. obj.from = this.from;
  19195. if (obj.identifier && token) obj.raw_text = token.text || token.value;
  19196. if (token && token.startLine && token.startLine !== this.line) {
  19197. obj.startLine = token.startLine;
  19198. }
  19199. if (token && token.context) {
  19200. // Context of current token
  19201. obj.context = token.context;
  19202. }
  19203. if (token && token.depth) {
  19204. // Nested template depth
  19205. obj.depth = token.depth;
  19206. }
  19207. if (token && token.isUnclosed) {
  19208. // Mark token as unclosed string / template literal
  19209. obj.isUnclosed = token.isUnclosed;
  19210. }
  19211. if (isProperty && obj.identifier) {
  19212. obj.isProperty = isProperty;
  19213. }
  19214. obj.check = checks.check;
  19215. return obj;
  19216. }.bind(this);
  19217. for (;;) {
  19218. if (!this.input.length) {
  19219. if (this.nextLine(checks)) {
  19220. return create("(endline)", "");
  19221. }
  19222. if (this.exhausted) {
  19223. return null;
  19224. }
  19225. this.exhausted = true;
  19226. return create("(end)", "");
  19227. }
  19228. token = this.next(checks);
  19229. if (!token) {
  19230. if (this.input.length) {
  19231. // Unexpected character.
  19232. this.trigger("error", {
  19233. code: "E024",
  19234. line: this.line,
  19235. character: this.char,
  19236. data: [ this.peek() ]
  19237. });
  19238. this.input = "";
  19239. }
  19240. continue;
  19241. }
  19242. switch (token.type) {
  19243. case Token.StringLiteral:
  19244. this.triggerAsync("String", {
  19245. line: this.line,
  19246. char: this.char,
  19247. from: this.from,
  19248. startLine: token.startLine,
  19249. startChar: token.startChar,
  19250. value: token.value,
  19251. quote: token.quote
  19252. }, checks, function() { return true; });
  19253. return create("(string)", token.value, null, token);
  19254. case Token.TemplateHead:
  19255. this.trigger("TemplateHead", {
  19256. line: this.line,
  19257. char: this.char,
  19258. from: this.from,
  19259. startLine: token.startLine,
  19260. startChar: token.startChar,
  19261. value: token.value
  19262. });
  19263. return create("(template)", token.value, null, token);
  19264. case Token.TemplateMiddle:
  19265. this.trigger("TemplateMiddle", {
  19266. line: this.line,
  19267. char: this.char,
  19268. from: this.from,
  19269. startLine: token.startLine,
  19270. startChar: token.startChar,
  19271. value: token.value
  19272. });
  19273. return create("(template middle)", token.value, null, token);
  19274. case Token.TemplateTail:
  19275. this.trigger("TemplateTail", {
  19276. line: this.line,
  19277. char: this.char,
  19278. from: this.from,
  19279. startLine: token.startLine,
  19280. startChar: token.startChar,
  19281. value: token.value
  19282. });
  19283. return create("(template tail)", token.value, null, token);
  19284. case Token.NoSubstTemplate:
  19285. this.trigger("NoSubstTemplate", {
  19286. line: this.line,
  19287. char: this.char,
  19288. from: this.from,
  19289. startLine: token.startLine,
  19290. startChar: token.startChar,
  19291. value: token.value
  19292. });
  19293. return create("(no subst template)", token.value, null, token);
  19294. case Token.Identifier:
  19295. this.triggerAsync("Identifier", {
  19296. line: this.line,
  19297. char: this.char,
  19298. from: this.from,
  19299. name: token.value,
  19300. raw_name: token.text,
  19301. isProperty: state.tokens.curr.id === "."
  19302. }, checks, function() { return true; });
  19303. /* falls through */
  19304. case Token.Keyword:
  19305. return create("(identifier)", token.value, state.tokens.curr.id === ".", token);
  19306. case Token.NumericLiteral:
  19307. if (token.isMalformed) {
  19308. this.trigger("error", {
  19309. code: "E067",
  19310. line: this.line,
  19311. character: this.char,
  19312. data: [ token.value ]
  19313. });
  19314. }
  19315. this.triggerAsync("warning", {
  19316. code: "W114",
  19317. line: this.line,
  19318. character: this.char,
  19319. data: [ "0x-" ]
  19320. }, checks, function() { return token.base === 16 && state.jsonMode; });
  19321. this.triggerAsync("warning", {
  19322. code: "W115",
  19323. line: this.line,
  19324. character: this.char
  19325. }, checks, function() {
  19326. return state.isStrict() && token.base === 8 && token.isLegacy;
  19327. });
  19328. this.triggerAsync("error", {
  19329. code: "E068",
  19330. line: this.line,
  19331. character: this.char
  19332. }, checks, function() {
  19333. return state.isStrict() && token.isNonOctal;
  19334. });
  19335. this.trigger("Number", {
  19336. line: this.line,
  19337. char: this.char,
  19338. from: this.from,
  19339. value: token.value,
  19340. base: token.base,
  19341. isMalformed: token.isMalformed
  19342. });
  19343. return create("(number)", token.value);
  19344. case Token.RegExp:
  19345. return create("(regexp)", token.value);
  19346. case Token.Comment:
  19347. if (token.isSpecial) {
  19348. return {
  19349. id: '(comment)',
  19350. value: token.value,
  19351. body: token.body,
  19352. type: token.commentType,
  19353. isSpecial: token.isSpecial,
  19354. line: this.line,
  19355. character: this.char,
  19356. from: this.from
  19357. };
  19358. }
  19359. break;
  19360. default:
  19361. return create("(punctuator)", token.value);
  19362. }
  19363. }
  19364. }
  19365. };
  19366. exports.Lexer = Lexer;
  19367. exports.Context = Context;
  19368. },{"../data/ascii-identifier-data.js":1,"../data/es5-identifier-names.js":2,"../data/non-ascii-identifier-part-only.js":3,"../data/non-ascii-identifier-start.js":4,"./reg.js":22,"./state.js":24,"./validate-unicode-escape-sequence":26,"events":11,"lodash":12}],18:[function(require,module,exports){
  19369. "use strict";
  19370. var _ = require("lodash");
  19371. var errors = {
  19372. // JSHint options
  19373. E001: "Bad {a}option: '{b}'.",
  19374. E002: "Bad option value.",
  19375. // JSHint input
  19376. E003: "Expected a JSON value.",
  19377. E004: "Input is neither a string nor an array of strings.",
  19378. E005: "Input is empty.",
  19379. E006: "Unexpected early end of program.",
  19380. // Strict mode
  19381. E007: "Missing \"use strict\" statement.",
  19382. E008: "Strict violation.",
  19383. E009: "Option 'validthis' can't be used in a global scope.",
  19384. E010: "'with' is not allowed in strict mode.",
  19385. // Constants
  19386. E011: "'{a}' has already been declared.",
  19387. E012: "const '{a}' is initialized to 'undefined'.",
  19388. E013: "Attempting to override '{a}' which is a constant.",
  19389. // Regular expressions
  19390. E014: "A regular expression literal can be confused with '/='.",
  19391. E015: "Unclosed regular expression.",
  19392. E016: "Invalid regular expression.",
  19393. // Tokens
  19394. E017: "Unclosed comment.",
  19395. E018: "Unbegun comment.",
  19396. E019: "Unmatched '{a}'.",
  19397. E020: "Expected '{a}' to match '{b}' from line {c} and instead saw '{d}'.",
  19398. E021: "Expected '{a}' and instead saw '{b}'.",
  19399. E022: "Line breaking error '{a}'.",
  19400. E023: "Missing '{a}'.",
  19401. E024: "Unexpected '{a}'.",
  19402. E025: "Missing ':' on a case clause.",
  19403. E026: "Missing '}' to match '{' from line {a}.",
  19404. E027: "Missing ']' to match '[' from line {a}.",
  19405. E028: "Illegal comma.",
  19406. E029: "Unclosed string.",
  19407. // Everything else
  19408. E030: "Expected an identifier and instead saw '{a}'.",
  19409. E031: "Bad assignment.", // FIXME: Rephrase
  19410. E032: "Expected a small integer or 'false' and instead saw '{a}'.",
  19411. E033: "Expected an operator and instead saw '{a}'.",
  19412. E034: "get/set are ES5 features.",
  19413. E035: "Missing property name.",
  19414. E036: "Expected to see a statement and instead saw a block.",
  19415. E037: null,
  19416. E038: null,
  19417. E039: "Function declarations are not invocable. Wrap the whole function invocation in parens.",
  19418. E040: "Each value should have its own case label.",
  19419. E041: "Unrecoverable syntax error.",
  19420. E042: "Stopping.",
  19421. E043: "Too many errors.",
  19422. E044: null,
  19423. E045: "Invalid for each loop.",
  19424. E046: "Yield expressions may only occur within generator functions.",
  19425. E047: null,
  19426. E048: "{a} declaration not directly within block.",
  19427. E049: "A {a} cannot be named '{b}'.",
  19428. E050: "Mozilla requires the yield expression to be parenthesized here.",
  19429. E051: null,
  19430. E052: "Unclosed template literal.",
  19431. E053: "{a} declarations are only allowed at the top level of module scope.",
  19432. E054: "Class properties must be methods. Expected '(' but instead saw '{a}'.",
  19433. E055: "The '{a}' option cannot be set after any executable code.",
  19434. E056: "'{a}' was used before it was declared, which is illegal for '{b}' variables.",
  19435. E057: "Invalid meta property: '{a}.{b}'.",
  19436. E058: "Missing semicolon.",
  19437. E059: "Incompatible values for the '{a}' and '{b}' linting options.",
  19438. E060: "Non-callable values cannot be used as the second operand to instanceof.",
  19439. E061: "Invalid position for 'yield' expression (consider wrapping in parenthesis).",
  19440. E062: "Rest parameter does not a support default value.",
  19441. E063: "Super property may only be used within method bodies.",
  19442. E064: "Super call may only be used within class method bodies.",
  19443. E065: "Functions defined outside of strict mode with non-simple parameter lists may not " +
  19444. "enable strict mode.",
  19445. E066: "Asynchronous iteration is only available with for-of loops.",
  19446. E067: "Malformed numeric literal: '{a}'.",
  19447. E068: "Decimals with leading zeros are not allowed in strict mode.",
  19448. E069: "Duplicate exported binding: '{a}'.",
  19449. E070: "import.meta may only be used in module code."
  19450. };
  19451. var warnings = {
  19452. W001: "'hasOwnProperty' is a really bad name.",
  19453. W002: "Value of '{a}' may be overwritten in IE 8 and earlier.",
  19454. W003: "'{a}' was used before it was defined.",
  19455. W004: "'{a}' is already defined.",
  19456. W005: "A dot following a number can be confused with a decimal point.",
  19457. W006: "Confusing minuses.",
  19458. W007: "Confusing plusses.",
  19459. W008: "A leading decimal point can be confused with a dot: '{a}'.",
  19460. W009: "The array literal notation [] is preferable.",
  19461. W010: "The object literal notation {} is preferable.",
  19462. W011: null,
  19463. W012: null,
  19464. W013: null,
  19465. W014: "Misleading line break before '{a}'; readers may interpret this as an expression boundary.",
  19466. W015: null,
  19467. W016: "Unexpected use of '{a}'.",
  19468. W017: "Bad operand.",
  19469. W018: "Confusing use of '{a}'.",
  19470. W019: "Use the isNaN function to compare with NaN.",
  19471. W020: "Read only.",
  19472. W021: "Reassignment of '{a}', which is a {b}. " +
  19473. "Use 'var' or 'let' to declare bindings that may change.",
  19474. W022: "Do not assign to the exception parameter.",
  19475. W023: null,
  19476. W024: "Expected an identifier and instead saw '{a}' (a reserved word).",
  19477. W025: "Missing name in function declaration.",
  19478. W026: "Inner functions should be listed at the top of the outer function.",
  19479. W027: "Unreachable '{a}' after '{b}'.",
  19480. W028: "Label '{a}' on {b} statement.",
  19481. W030: "Expected an assignment or function call and instead saw an expression.",
  19482. W031: "Do not use 'new' for side effects.",
  19483. W032: "Unnecessary semicolon.",
  19484. W033: "Missing semicolon.",
  19485. W034: "Unnecessary directive \"{a}\".",
  19486. W035: "Empty block.",
  19487. W036: "Unexpected /*member '{a}'.",
  19488. W037: "'{a}' is a statement label.",
  19489. W038: "'{a}' used out of scope.",
  19490. W039: null,
  19491. W040: "If a strict mode function is executed using function invocation, " +
  19492. "its 'this' value will be undefined.",
  19493. W041: null,
  19494. W042: "Avoid EOL escaping.",
  19495. W043: "Bad escaping of EOL. Use option multistr if needed.",
  19496. W044: "Bad or unnecessary escaping.", /* TODO(caitp): remove W044 */
  19497. W045: "Value described by numeric literal cannot be accurately " +
  19498. "represented with a number value: '{a}'.",
  19499. W046: "Don't use extra leading zeros '{a}'.",
  19500. W047: "A trailing decimal point can be confused with a dot: '{a}'.",
  19501. W048: "Unexpected control character in regular expression.",
  19502. W049: "Unexpected escaped character '{a}' in regular expression.",
  19503. W050: "JavaScript URL.",
  19504. W051: "Variables should not be deleted.",
  19505. W052: "Unexpected '{a}'.",
  19506. W053: "Do not use {a} as a constructor.",
  19507. W054: "The Function constructor is a form of eval.",
  19508. W055: "A constructor name should start with an uppercase letter.",
  19509. W056: "Bad constructor.",
  19510. W057: "Weird construction. Is 'new' necessary?",
  19511. W058: "Missing '()' invoking a constructor.",
  19512. W059: "Avoid arguments.{a}.",
  19513. W060: "document.write can be a form of eval.",
  19514. W061: "eval can be harmful.",
  19515. W062: "Wrap an immediate function invocation in parens " +
  19516. "to assist the reader in understanding that the expression " +
  19517. "is the result of a function, and not the function itself.",
  19518. W063: "Math is not a function.",
  19519. W064: "Missing 'new' prefix when invoking a constructor.",
  19520. W065: "Missing radix parameter.",
  19521. W066: "Implied eval. Consider passing a function instead of a string.",
  19522. W067: "Unorthodox function invocation.",
  19523. W068: "Wrapping non-IIFE function literals in parens is unnecessary.",
  19524. W069: "['{a}'] is better written in dot notation.",
  19525. W070: "Extra comma. (it breaks older versions of IE)",
  19526. W071: "This function has too many statements. ({a})",
  19527. W072: "This function has too many parameters. ({a})",
  19528. W073: "Blocks are nested too deeply. ({a})",
  19529. W074: "This function's cyclomatic complexity is too high. ({a})",
  19530. W075: "Duplicate {a} '{b}'.",
  19531. W076: "Unexpected parameter '{a}' in get {b} function.",
  19532. W077: "Expected a single parameter in set {a} function.",
  19533. W078: "Setter is defined without getter.",
  19534. W079: "Redefinition of '{a}'.",
  19535. W080: "It's not necessary to initialize '{a}' to 'undefined'.",
  19536. W081: null,
  19537. W082: "Function declarations should not be placed in blocks. " +
  19538. "Use a function expression or move the statement to the top of " +
  19539. "the outer function.",
  19540. W083: "Functions declared within loops referencing an outer scoped " +
  19541. "variable may lead to confusing semantics. ({a})",
  19542. W084: "Expected a conditional expression and instead saw an assignment.",
  19543. W085: "Don't use 'with'.",
  19544. W086: "Expected a 'break' statement before '{a}'.",
  19545. W087: "Forgotten 'debugger' statement?",
  19546. W088: "Creating global 'for' variable. Should be 'for (var {a} ...'.",
  19547. W089: "The body of a for in should be wrapped in an if statement to filter " +
  19548. "unwanted properties from the prototype.",
  19549. W090: "'{a}' is not a statement label.",
  19550. W091: null,
  19551. W093: "Did you mean to return a conditional instead of an assignment?",
  19552. W094: "Unexpected comma.",
  19553. W095: "Expected a string and instead saw {a}.",
  19554. W096: "The '{a}' key may produce unexpected results.",
  19555. W097: "Use the function form of \"use strict\".",
  19556. W098: "'{a}' is defined but never used.",
  19557. W099: null,
  19558. W100: null,
  19559. W101: "Line is too long.",
  19560. W102: null,
  19561. W103: "The '{a}' property is deprecated.",
  19562. W104: "'{a}' is available in ES{b} (use 'esversion: {b}') or Mozilla JS extensions (use moz).",
  19563. W105: null,
  19564. W106: "Identifier '{a}' is not in camel case.",
  19565. W107: "Script URL.",
  19566. W108: "Strings must use doublequote.",
  19567. W109: "Strings must use singlequote.",
  19568. W110: "Mixed double and single quotes.",
  19569. W112: "Unclosed string.",
  19570. W113: "Control character in string: {a}.",
  19571. W114: "Avoid {a}.",
  19572. W115: "Octal literals are not allowed in strict mode.",
  19573. W116: "Expected '{a}' and instead saw '{b}'.",
  19574. W117: "'{a}' is not defined.",
  19575. W118: "'{a}' is only available in Mozilla JavaScript extensions (use moz option).",
  19576. W119: "'{a}' is only available in ES{b} (use 'esversion: {b}').",
  19577. W120: "You might be leaking a variable ({a}) here.",
  19578. W121: "Extending prototype of native object: '{a}'.",
  19579. W122: "Invalid typeof value '{a}'",
  19580. W123: "'{a}' is already defined in outer scope.",
  19581. W124: "A generator function should contain at least one yield expression.",
  19582. W125: "This line contains non-breaking spaces: http://jshint.com/docs/options/#nonbsp",
  19583. W126: "Unnecessary grouping operator.",
  19584. W127: "Unexpected use of a comma operator.",
  19585. W128: "Empty array elements require elision=true.",
  19586. W129: "'{a}' is defined in a future version of JavaScript. Use a " +
  19587. "different variable name to avoid migration issues.",
  19588. W130: "Invalid element after rest element.",
  19589. W131: "Invalid parameter after rest parameter.",
  19590. W132: "`var` declarations are forbidden. Use `let` or `const` instead.",
  19591. W133: "Invalid for-{a} loop left-hand-side: {b}.",
  19592. W134: "The '{a}' option is only available when linting ECMAScript {b} code.",
  19593. W135: "{a} may not be supported by non-browser environments.",
  19594. W136: "'{a}' must be in function scope.",
  19595. W137: "Empty destructuring: this is unnecessary and can be removed.",
  19596. W138: "Regular parameters should not come after default parameters.",
  19597. W139: "Function expressions should not be used as the second operand to instanceof.",
  19598. W140: "Missing comma.",
  19599. W141: "Empty {a}: this is unnecessary and can be removed.",
  19600. W142: "Empty {a}: consider replacing with `import '{b}';`.",
  19601. W143: "Assignment to properties of a mapped arguments object may cause " +
  19602. "unexpected changes to formal parameters.",
  19603. W144: "'{a}' is a non-standard language feature. Enable it using the '{b}' unstable option.",
  19604. W145: "Superfluous 'case' clause.",
  19605. W146: "Unnecessary `await` expression.",
  19606. W147: "Regular expressions should include the 'u' flag.",
  19607. W148: "Unnecessary RegExp 's' flag."
  19608. };
  19609. var info = {
  19610. I001: "Comma warnings can be turned off with 'laxcomma'.",
  19611. I002: null,
  19612. I003: "ES5 option is now set per default"
  19613. };
  19614. exports.errors = {};
  19615. exports.warnings = {};
  19616. exports.info = {};
  19617. _.each(errors, function(desc, code) {
  19618. exports.errors[code] = { code: code, desc: desc };
  19619. });
  19620. _.each(warnings, function(desc, code) {
  19621. exports.warnings[code] = { code: code, desc: desc };
  19622. });
  19623. _.each(info, function(desc, code) {
  19624. exports.info[code] = { code: code, desc: desc };
  19625. });
  19626. },{"lodash":12}],19:[function(require,module,exports){
  19627. /**
  19628. * The NameStack class is used to approximate function name inference as
  19629. * introduced by ECMAScript 2015. In that edition, the `name` property of
  19630. * function objects is set according to the function's syntactic form. For
  19631. * certain forms, this value depends on values available to the runtime during
  19632. * execution. For example:
  19633. *
  19634. * var fnName = function() {};
  19635. *
  19636. * In the program code above, the function object's `name` property is set to
  19637. * `"fnName"` during execution.
  19638. *
  19639. * This general "name inference" behavior extends to a number of additional
  19640. * syntactic forms, not all of which can be implemented statically. `NameStack`
  19641. * is a support class representing a "best-effort" attempt to implement the
  19642. * specified behavior in cases where this may be done statically.
  19643. *
  19644. * For more information on this behavior, see the following blog post:
  19645. * https://bocoup.com/blog/whats-in-a-function-name
  19646. */
  19647. "use strict";
  19648. function NameStack() {
  19649. this._stack = [];
  19650. }
  19651. Object.defineProperty(NameStack.prototype, "length", {
  19652. get: function() {
  19653. return this._stack.length;
  19654. }
  19655. });
  19656. /**
  19657. * Create a new entry in the stack. Useful for tracking names across
  19658. * expressions.
  19659. */
  19660. NameStack.prototype.push = function() {
  19661. this._stack.push(null);
  19662. };
  19663. /**
  19664. * Discard the most recently-created name on the stack.
  19665. */
  19666. NameStack.prototype.pop = function() {
  19667. this._stack.pop();
  19668. };
  19669. /**
  19670. * Update the most recent name on the top of the stack.
  19671. *
  19672. * @param {object} token The token to consider as the source for the most
  19673. * recent name.
  19674. */
  19675. NameStack.prototype.set = function(token) {
  19676. this._stack[this.length - 1] = token;
  19677. };
  19678. /**
  19679. * Generate a string representation of the most recent name.
  19680. *
  19681. * @returns {string}
  19682. */
  19683. NameStack.prototype.infer = function() {
  19684. var nameToken = this._stack[this.length - 1];
  19685. var prefix = "";
  19686. var type;
  19687. // During expected operation, the topmost entry on the stack will only
  19688. // reflect the current function's name when the function is declared without
  19689. // the `function` keyword (i.e. for in-line accessor methods). In other
  19690. // cases, the `function` expression itself will introduce an empty entry on
  19691. // the top of the stack, and this should be ignored.
  19692. if (!nameToken || nameToken.type === "class") {
  19693. nameToken = this._stack[this.length - 2];
  19694. }
  19695. if (!nameToken) {
  19696. return "(empty)";
  19697. }
  19698. type = nameToken.type;
  19699. if (type !== "(string)" && type !== "(number)" && type !== "(identifier)" && type !== "default") {
  19700. return "(expression)";
  19701. }
  19702. if (nameToken.accessorType) {
  19703. prefix = nameToken.accessorType + " ";
  19704. }
  19705. return prefix + nameToken.value;
  19706. };
  19707. module.exports = NameStack;
  19708. },{}],20:[function(require,module,exports){
  19709. "use strict";
  19710. // These are the JSHint boolean options.
  19711. exports.bool = {
  19712. enforcing: {
  19713. /**
  19714. * This option prohibits the use of bitwise operators such as `^` (XOR),
  19715. * `|` (OR) and others. Bitwise operators are very rare in JavaScript
  19716. * programs and quite often `&` is simply a mistyped `&&`.
  19717. */
  19718. bitwise : true,
  19719. /**
  19720. *
  19721. * This options prohibits overwriting prototypes of native objects such as
  19722. * `Array`, `Date` and so on.
  19723. *
  19724. * // jshint freeze:true
  19725. * Array.prototype.count = function (value) { return 4; };
  19726. * // -> Warning: Extending prototype of native object: 'Array'.
  19727. */
  19728. freeze : true,
  19729. /**
  19730. * This option allows you to force all variable names to use either
  19731. * camelCase style or UPPER_CASE with underscores.
  19732. *
  19733. * @deprecated JSHint is limiting its scope to issues of code correctness.
  19734. * If you would like to enforce rules relating to code style,
  19735. * check out [the JSCS
  19736. * project](https://github.com/jscs-dev/node-jscs).
  19737. */
  19738. camelcase : true,
  19739. /**
  19740. * This option requires you to always put curly braces around blocks in
  19741. * loops and conditionals. JavaScript allows you to omit curly braces when
  19742. * the block consists of only one statement, for example:
  19743. *
  19744. * while (day)
  19745. * shuffle();
  19746. *
  19747. * However, in some circumstances, it can lead to bugs (you'd think that
  19748. * `sleep()` is a part of the loop while in reality it is not):
  19749. *
  19750. * while (day)
  19751. * shuffle();
  19752. * sleep();
  19753. */
  19754. curly : true,
  19755. /**
  19756. * This options prohibits the use of `==` and `!=` in favor of `===` and
  19757. * `!==`. The former try to coerce values before comparing them which can
  19758. * lead to some unexpected results. The latter don't do any coercion so
  19759. * they are generally safer. If you would like to learn more about type
  19760. * coercion in JavaScript, we recommend [Truth, Equality and
  19761. * JavaScript](http://javascriptweblog.wordpress.com/2011/02/07/truth-equality-and-javascript/)
  19762. * by Angus Croll.
  19763. */
  19764. eqeqeq : true,
  19765. /**
  19766. * This option enables warnings about the use of identifiers which are
  19767. * defined in future versions of JavaScript. Although overwriting them has
  19768. * no effect in contexts where they are not implemented, this practice can
  19769. * cause issues when migrating codebases to newer versions of the language.
  19770. */
  19771. futurehostile: true,
  19772. /**
  19773. * This option tells JSHint that your code needs to adhere to ECMAScript 3
  19774. * specification. Use this option if you need your program to be executable
  19775. * in older browsers—such as Internet Explorer 6/7/8/9—and other legacy
  19776. * JavaScript environments.
  19777. *
  19778. * @deprecated Use `esversion: 3` instead.
  19779. */
  19780. es3 : true,
  19781. /**
  19782. * This option enables syntax first defined in [the ECMAScript 5.1
  19783. * specification](http://es5.github.io/). This includes allowing reserved
  19784. * keywords as object properties.
  19785. *
  19786. * @deprecated Use `esversion: 5` instead.
  19787. */
  19788. es5 : true,
  19789. /**
  19790. * This option requires all `for in` loops to filter object's items. The
  19791. * for in statement allows for looping through the names of all of the
  19792. * properties of an object including those inherited through the prototype
  19793. * chain. This behavior can lead to unexpected items in your object so it
  19794. * is generally safer to always filter inherited properties out as shown in
  19795. * the example:
  19796. *
  19797. * for (key in obj) {
  19798. * if (obj.hasOwnProperty(key)) {
  19799. * // We are sure that obj[key] belongs to the object and was not inherited.
  19800. * }
  19801. * }
  19802. *
  19803. * For more in-depth understanding of `for in` loops in JavaScript, read
  19804. * [Exploring JavaScript for-in
  19805. * loops](http://javascriptweblog.wordpress.com/2011/01/04/exploring-javascript-for-in-loops/)
  19806. * by Angus Croll.
  19807. */
  19808. forin : true,
  19809. /**
  19810. * This option prohibits the use of immediate function invocations without
  19811. * wrapping them in parentheses. Wrapping parentheses assists readers of
  19812. * your code in understanding that the expression is the result of a
  19813. * function, and not the function itself.
  19814. *
  19815. * @deprecated JSHint is limiting its scope to issues of code correctness.
  19816. * If you would like to enforce rules relating to code style,
  19817. * check out [the JSCS
  19818. * project](https://github.com/jscs-dev/node-jscs).
  19819. */
  19820. immed : true,
  19821. /**
  19822. * This option prohibits unnecessary clauses within `switch` statements,
  19823. * e.g.
  19824. *
  19825. * switch (x) {
  19826. * case 1:
  19827. * default:
  19828. * z();
  19829. * }
  19830. *
  19831. * While clauses like these are techincally valid, they do not effect
  19832. * program behavior and may indicate an erroneous refactoring.
  19833. */
  19834. leanswitch : true,
  19835. /**
  19836. * This option requires you to capitalize names of constructor functions.
  19837. * Capitalizing functions that are intended to be used with `new` operator
  19838. * is just a convention that helps programmers to visually distinguish
  19839. * constructor functions from other types of functions to help spot
  19840. * mistakes when using `this`.
  19841. *
  19842. * Not doing so won't break your code in any browsers or environments but
  19843. * it will be a bit harder to figure out—by reading the code—if the
  19844. * function was supposed to be used with or without new. And this is
  19845. * important because when the function that was intended to be used with
  19846. * `new` is used without it, `this` will point to the global object instead
  19847. * of a new object.
  19848. *
  19849. * @deprecated JSHint is limiting its scope to issues of code correctness.
  19850. * If you would like to enforce rules relating to code style,
  19851. * check out [the JSCS
  19852. * project](https://github.com/jscs-dev/node-jscs).
  19853. */
  19854. newcap : true,
  19855. /**
  19856. * This option prohibits the use of `arguments.caller` and
  19857. * `arguments.callee`. Both `.caller` and `.callee` make quite a few
  19858. * optimizations impossible so they were deprecated in future versions of
  19859. * JavaScript. In fact, ECMAScript 5 forbids the use of `arguments.callee`
  19860. * in strict mode.
  19861. */
  19862. noarg : true,
  19863. /**
  19864. * This option prohibits the use of the comma operator. When misused, the
  19865. * comma operator can obscure the value of a statement and promote
  19866. * incorrect code.
  19867. */
  19868. nocomma : true,
  19869. /**
  19870. * This option warns when you have an empty block in your code. JSLint was
  19871. * originally warning for all empty blocks and we simply made it optional.
  19872. * There were no studies reporting that empty blocks in JavaScript break
  19873. * your code in any way.
  19874. *
  19875. * @deprecated JSHint is limiting its scope to issues of code correctness.
  19876. * If you would like to enforce rules relating to code style,
  19877. * check out [the JSCS
  19878. * project](https://github.com/jscs-dev/node-jscs).
  19879. */
  19880. noempty : true,
  19881. /**
  19882. * This option warns about "non-breaking whitespace" characters. These
  19883. * characters can be entered with option-space on Mac computers and have a
  19884. * potential of breaking non-UTF8 web pages.
  19885. */
  19886. nonbsp : true,
  19887. /**
  19888. * This option prohibits the use of constructor functions for side-effects.
  19889. * Some people like to call constructor functions without assigning its
  19890. * result to any variable:
  19891. *
  19892. * new MyConstructor();
  19893. *
  19894. * There is no advantage in this approach over simply calling
  19895. * `MyConstructor` since the object that the operator `new` creates isn't
  19896. * used anywhere so you should generally avoid constructors like this one.
  19897. */
  19898. nonew : true,
  19899. /**
  19900. * Async functions resolve on their return value. In most cases, this makes
  19901. * returning the result of an AwaitExpression (which is itself a Promise
  19902. * instance) unnecessary. For clarity, it's often preferable to return the
  19903. * result of the asynchronous operation directly. The notable exception is
  19904. * within the `try` clause of a TryStatement--for more, see "await vs
  19905. * return vs return await":
  19906. *
  19907. * https://jakearchibald.com/2017/await-vs-return-vs-return-await/
  19908. */
  19909. noreturnawait: true,
  19910. /**
  19911. * This option enables warnings for regular expressions which do not
  19912. * include the "u" flag. The "u" flag extends support for Unicode and also
  19913. * enables more strict parsing rules. JSHint will enforce these rules even
  19914. * if it is executed in a JavaScript engine which does not support the "u"
  19915. * flag.
  19916. */
  19917. regexpu : true,
  19918. /**
  19919. * This option prohibits the use of explicitly undeclared variables. This
  19920. * option is very useful for spotting leaking and mistyped variables.
  19921. *
  19922. * // jshint undef:true
  19923. *
  19924. * function test() {
  19925. * var myVar = 'Hello, World';
  19926. * console.log(myvar); // Oops, typoed here. JSHint with undef will complain
  19927. * }
  19928. *
  19929. * If your variable is defined in another file, you can use the `global`
  19930. * directive to tell JSHint about it.
  19931. */
  19932. undef : true,
  19933. /**
  19934. * This option prohibits the use of the grouping operator when it is not
  19935. * strictly required. Such usage commonly reflects a misunderstanding of
  19936. * unary operators, for example:
  19937. *
  19938. * // jshint singleGroups: true
  19939. *
  19940. * delete(obj.attr); // Warning: Unnecessary grouping operator.
  19941. */
  19942. singleGroups: false,
  19943. /**
  19944. * When set to true, the use of VariableStatements are forbidden.
  19945. * For example:
  19946. *
  19947. * // jshint varstmt: true
  19948. *
  19949. * var a; // Warning: `var` declarations are forbidden. Use `let` or `const` instead.
  19950. */
  19951. varstmt: false,
  19952. /**
  19953. * This option is a short hand for the most strict JSHint configuration as
  19954. * available in JSHint version 2.6.3. It enables all enforcing options and
  19955. * disables all relaxing options that were defined in that release.
  19956. *
  19957. * @deprecated The option cannot be maintained without automatically opting
  19958. * users in to new features. This can lead to unexpected
  19959. * warnings/errors in when upgrading between minor versions of
  19960. * JSHint.
  19961. */
  19962. enforceall : false,
  19963. /**
  19964. * This option warns when a comma is not placed after the last element in an
  19965. * array or object literal. Due to bugs in old versions of IE, trailing
  19966. * commas used to be discouraged, but since ES5 their semantics were
  19967. * standardized. (See
  19968. * [#11.1.4](http://www.ecma-international.org/ecma-262/5.1/#sec-11.1.4) and
  19969. * [#11.1.5](http://www.ecma-international.org/ecma-262/5.1/#sec-11.1.5).)
  19970. * Now, they help to prevent the same [visual
  19971. * ambiguities](http://www.ecma-international.org/ecma-262/5.1/#sec-7.9.2)
  19972. * that the strict usage of semicolons helps prevent.
  19973. *
  19974. * For example, this code might have worked last Tuesday:
  19975. *
  19976. * [
  19977. * b + c
  19978. * ].forEach(print);
  19979. *
  19980. * But if one adds an element to the array and forgets to compensate for the
  19981. * missing comma, no syntax error is thrown, and a linter cannot determine
  19982. * if this was a mistake or an intentional function invocation.
  19983. *
  19984. * [
  19985. * b + c
  19986. * (d + e)
  19987. * ].forEach(print);
  19988. *
  19989. * If one always appends a list item with a comma, this ambiguity cannot
  19990. * occur:
  19991. *
  19992. * [
  19993. * b + c,
  19994. * ].forEach(print);
  19995. *
  19996. * [
  19997. * b + c,
  19998. * (d + e),
  19999. * ].forEach(print);
  20000. */
  20001. trailingcomma: false
  20002. },
  20003. relaxing: {
  20004. /**
  20005. * This option suppresses warnings about missing semicolons. There is a lot
  20006. * of FUD about semicolon spread by quite a few people in the community.
  20007. * The common myths are that semicolons are required all the time (they are
  20008. * not) and that they are unreliable. JavaScript has rules about semicolons
  20009. * which are followed by *all* browsers so it is up to you to decide
  20010. * whether you should or should not use semicolons in your code.
  20011. *
  20012. * For more information about semicolons in JavaScript read [An Open Letter
  20013. * to JavaScript Leaders Regarding
  20014. * Semicolons](http://blog.izs.me/post/2353458699/an-open-letter-to-javascript-leaders-regarding)
  20015. * by Isaac Schlueter and [JavaScript Semicolon
  20016. * Insertion](http://inimino.org/~inimino/blog/javascript_semicolons).
  20017. */
  20018. asi : true,
  20019. /**
  20020. * This option suppresses warnings about multi-line strings. Multi-line
  20021. * strings can be dangerous in JavaScript because all hell breaks loose if
  20022. * you accidentally put a whitespace in between the escape character (`\`)
  20023. * and a new line.
  20024. *
  20025. * Note that even though this option allows correct multi-line strings, it
  20026. * still warns about multi-line strings without escape characters or with
  20027. * anything in between the escape character and a whitespace.
  20028. *
  20029. * // jshint multistr:true
  20030. *
  20031. * var text = "Hello\
  20032. * World"; // All good.
  20033. *
  20034. * text = "Hello
  20035. * World"; // Warning, no escape character.
  20036. *
  20037. * text = "Hello\
  20038. * World"; // Warning, there is a space after \
  20039. *
  20040. * @deprecated JSHint is limiting its scope to issues of code correctness.
  20041. * If you would like to enforce rules relating to code style,
  20042. * check out [the JSCS
  20043. * project](https://github.com/jscs-dev/node-jscs).
  20044. */
  20045. multistr : true,
  20046. /**
  20047. * This option suppresses warnings about the `debugger` statements in your
  20048. * code.
  20049. */
  20050. debug : true,
  20051. /**
  20052. * This option suppresses warnings about the use of assignments in cases
  20053. * where comparisons are expected. More often than not, code like `if (a =
  20054. * 10) {}` is a typo. However, it can be useful in cases like this one:
  20055. *
  20056. * for (var i = 0, person; person = people[i]; i++) {}
  20057. *
  20058. * You can silence this error on a per-use basis by surrounding the assignment
  20059. * with parenthesis, such as:
  20060. *
  20061. * for (var i = 0, person; (person = people[i]); i++) {}
  20062. */
  20063. boss : true,
  20064. /**
  20065. * This option suppresses warnings about the use of `eval`. The use of
  20066. * `eval` is discouraged because it can make your code vulnerable to
  20067. * various injection attacks and it makes it hard for JavaScript
  20068. * interpreter to do certain optimizations.
  20069. */
  20070. evil : true,
  20071. /**
  20072. * This option suppresses warnings about declaring variables inside
  20073. * of control structures while accessing them later from the outside.
  20074. * Even though identifiers declared with `var` have two real scopes—global
  20075. * and function—such practice leads to confusion among people new to
  20076. * the language and hard-to-debug bugs. This is why, by default, JSHint
  20077. * warns about variables that are used outside of their intended scope.
  20078. *
  20079. * function test() {
  20080. * if (true) {
  20081. * var x = 0;
  20082. * }
  20083. *
  20084. * x += 1; // Default: 'x' used out of scope.
  20085. * // No warning when funcscope:true
  20086. * }
  20087. */
  20088. funcscope : true,
  20089. /**
  20090. * This option suppresses warnings about the use of global strict mode.
  20091. * Global strict mode can break third-party widgets so it is not
  20092. * recommended.
  20093. *
  20094. * For more info about strict mode see the `strict` option.
  20095. *
  20096. * @deprecated Use `strict: "global"`.
  20097. */
  20098. globalstrict: true,
  20099. /**
  20100. * This option suppresses warnings about the `__iterator__` property. This
  20101. * property is not supported by all browsers so use it carefully.
  20102. */
  20103. iterator : true,
  20104. /**
  20105. * This option suppresses warnings about invalid `typeof` operator values.
  20106. * This operator has only [a limited set of possible return
  20107. * values](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof).
  20108. * By default, JSHint warns when you compare its result with an invalid
  20109. * value which often can be a typo.
  20110. *
  20111. * // 'fuction' instead of 'function'
  20112. * if (typeof a == "fuction") { // Invalid typeof value 'fuction'
  20113. * // ...
  20114. * }
  20115. *
  20116. * Do not use this option unless you're absolutely sure you don't want
  20117. * these checks.
  20118. */
  20119. notypeof : true,
  20120. /**
  20121. * This option prohibits the use of unary increment and decrement
  20122. * operators. Some people think that `++` and `--` reduces the quality of
  20123. * their coding styles and there are programming languages—such as
  20124. * Python—that go completely without these operators.
  20125. */
  20126. plusplus : true,
  20127. /**
  20128. * This option suppresses warnings about the `__proto__` property.
  20129. */
  20130. proto : true,
  20131. /**
  20132. * This option suppresses warnings about the use of script-targeted
  20133. * URLs—such as `javascript:...`.
  20134. */
  20135. scripturl : true,
  20136. /**
  20137. * This option suppresses warnings about using `[]` notation when it can be
  20138. * expressed in dot notation: `person['name']` vs. `person.name`.
  20139. *
  20140. * @deprecated JSHint is limiting its scope to issues of code correctness.
  20141. * If you would like to enforce rules relating to code style,
  20142. * check out [the JSCS
  20143. * project](https://github.com/jscs-dev/node-jscs).
  20144. */
  20145. sub : true,
  20146. /**
  20147. * This option suppresses warnings about "weird" constructions like
  20148. * `new function () { ... }` and `new Object;`. Such constructions are
  20149. * sometimes used to produce singletons in JavaScript:
  20150. *
  20151. * var singleton = new function() {
  20152. * var privateVar;
  20153. *
  20154. * this.publicMethod = function () {}
  20155. * this.publicMethod2 = function () {}
  20156. * };
  20157. */
  20158. supernew : true,
  20159. /**
  20160. * This option suppresses most of the warnings about possibly unsafe line
  20161. * breakings in your code. It doesn't suppress warnings about comma-first
  20162. * coding style. To suppress those you have to use `laxcomma` (see below).
  20163. *
  20164. * @deprecated JSHint is limiting its scope to issues of code correctness.
  20165. * If you would like to enforce rules relating to code style,
  20166. * check out [the JSCS
  20167. * project](https://github.com/jscs-dev/node-jscs).
  20168. */
  20169. laxbreak : true,
  20170. /**
  20171. * This option suppresses warnings about comma-first coding style:
  20172. *
  20173. * var obj = {
  20174. * name: 'Anton'
  20175. * , handle: 'valueof'
  20176. * , role: 'SW Engineer'
  20177. * };
  20178. *
  20179. * @deprecated JSHint is limiting its scope to issues of code correctness.
  20180. * If you would like to enforce rules relating to code style,
  20181. * check out [the JSCS
  20182. * project](https://github.com/jscs-dev/node-jscs).
  20183. */
  20184. laxcomma : true,
  20185. /**
  20186. * This option suppresses warnings about possible strict violations when
  20187. * the code is running in strict mode and you use `this` in a
  20188. * non-constructor function. You should use this option—in a function scope
  20189. * only—when you are positive that your use of `this` is valid in the
  20190. * strict mode (for example, if you call your function using
  20191. * `Function.call`).
  20192. *
  20193. * **Note:** This option can be used only inside of a function scope.
  20194. * JSHint will fail with an error if you will try to set this option
  20195. * globally.
  20196. */
  20197. validthis : true,
  20198. /**
  20199. * This option suppresses warnings about the use of the `with` statement.
  20200. * The semantics of the `with` statement can cause confusion among
  20201. * developers and accidental definition of global variables.
  20202. *
  20203. * More info:
  20204. *
  20205. * * [with Statement Considered
  20206. * Harmful](http://yuiblog.com/blog/2006/04/11/with-statement-considered-harmful/)
  20207. */
  20208. withstmt : true,
  20209. /**
  20210. * This options tells JSHint that your code uses Mozilla JavaScript
  20211. * extensions. Unless you develop specifically for the Firefox web browser
  20212. * you don't need this option.
  20213. *
  20214. * More info:
  20215. *
  20216. * * [New in JavaScript
  20217. * 1.7](https://developer.mozilla.org/en-US/docs/JavaScript/New_in_JavaScript/1.7)
  20218. */
  20219. moz : true,
  20220. /**
  20221. * This option suppresses warnings about generator functions with no
  20222. * `yield` statement in them.
  20223. */
  20224. noyield : true,
  20225. /**
  20226. * This option suppresses warnings about `== null` comparisons. Such
  20227. * comparisons are often useful when you want to check if a variable is
  20228. * `null` or `undefined`.
  20229. */
  20230. eqnull : true,
  20231. /**
  20232. * This option suppresses warnings about missing semicolons, but only when
  20233. * the semicolon is omitted for the last statement in a one-line block:
  20234. *
  20235. * var name = (function() { return 'Anton' }());
  20236. *
  20237. * This is a very niche use case that is useful only when you use automatic
  20238. * JavaScript code generators.
  20239. */
  20240. lastsemic : true,
  20241. /**
  20242. * This option suppresses warnings about functions inside of loops.
  20243. * Defining functions inside of loops can lead to bugs such as this one:
  20244. *
  20245. * var nums = [];
  20246. *
  20247. * for (var i = 0; i < 10; i++) {
  20248. * nums[i] = function (j) {
  20249. * return i + j;
  20250. * };
  20251. * }
  20252. *
  20253. * nums[0](2); // Prints 12 instead of 2
  20254. *
  20255. * To fix the code above you need to copy the value of `i`:
  20256. *
  20257. * var nums = [];
  20258. *
  20259. * for (var i = 0; i < 10; i++) {
  20260. * (function (i) {
  20261. * nums[i] = function (j) {
  20262. * return i + j;
  20263. * };
  20264. * }(i));
  20265. * }
  20266. */
  20267. loopfunc : true,
  20268. /**
  20269. * This option suppresses warnings about the use of expressions where
  20270. * normally you would expect to see assignments or function calls. Most of
  20271. * the time, such code is a typo. However, it is not forbidden by the spec
  20272. * and that's why this warning is optional.
  20273. */
  20274. expr : true,
  20275. /**
  20276. * This option tells JSHint that your code uses ECMAScript 6 specific
  20277. * syntax. Note that not all browsers implement these features.
  20278. *
  20279. * More info:
  20280. *
  20281. * * [Specification for ECMAScript
  20282. * 6](http://www.ecma-international.org/ecma-262/6.0/index.html)
  20283. *
  20284. * @deprecated Use `esversion: 6` instead.
  20285. */
  20286. esnext : true,
  20287. /**
  20288. * This option tells JSHint that your code uses ES3 array elision elements,
  20289. * or empty elements (for example, `[1, , , 4, , , 7]`).
  20290. */
  20291. elision : true,
  20292. },
  20293. // Third party globals
  20294. environments: {
  20295. /**
  20296. * This option defines globals exposed by the
  20297. * [MooTools](http://mootools.net/) JavaScript framework.
  20298. */
  20299. mootools : true,
  20300. /**
  20301. * This option defines globals exposed by
  20302. * [CouchDB](http://couchdb.apache.org/). CouchDB is a document-oriented
  20303. * database that can be queried and indexed in a MapReduce fashion using
  20304. * JavaScript.
  20305. */
  20306. couch : true,
  20307. /**
  20308. * This option defines globals exposed by [the Jasmine unit testing
  20309. * framework](https://jasmine.github.io/).
  20310. */
  20311. jasmine : true,
  20312. /**
  20313. * This option defines globals exposed by the [jQuery](http://jquery.com/)
  20314. * JavaScript library.
  20315. */
  20316. jquery : true,
  20317. /**
  20318. * This option defines globals available when your code is running inside
  20319. * of the Node runtime environment. [Node.js](http://nodejs.org/) is a
  20320. * server-side JavaScript environment that uses an asynchronous
  20321. * event-driven model. This option also skips some warnings that make sense
  20322. * in the browser environments but don't make sense in Node such as
  20323. * file-level `use strict` pragmas and `console.log` statements.
  20324. */
  20325. node : true,
  20326. /**
  20327. * This option defines globals exposed by [the QUnit unit testing
  20328. * framework](http://qunitjs.com/).
  20329. */
  20330. qunit : true,
  20331. /**
  20332. * This option defines globals available when your code is running inside
  20333. * of the Rhino runtime environment. [Rhino](http://www.mozilla.org/rhino/)
  20334. * is an open-source implementation of JavaScript written entirely in Java.
  20335. */
  20336. rhino : true,
  20337. /**
  20338. * This option defines globals exposed by [the ShellJS
  20339. * library](http://documentup.com/arturadib/shelljs).
  20340. */
  20341. shelljs : true,
  20342. /**
  20343. * This option defines globals exposed by the
  20344. * [Prototype](http://www.prototypejs.org/) JavaScript framework.
  20345. */
  20346. prototypejs : true,
  20347. /**
  20348. * This option defines globals exposed by the [YUI](http://yuilibrary.com/)
  20349. * JavaScript framework.
  20350. */
  20351. yui : true,
  20352. /**
  20353. * This option defines globals exposed by the "BDD" and "TDD" UIs of the
  20354. * [Mocha unit testing framework](http://mochajs.org/).
  20355. */
  20356. mocha : true,
  20357. /**
  20358. * This option informs JSHint that the input code describes an ECMAScript 6
  20359. * module. All module code is interpreted as strict mode code.
  20360. */
  20361. module : true,
  20362. /**
  20363. * This option defines globals available when your code is running as a
  20364. * script for the [Windows Script
  20365. * Host](http://en.wikipedia.org/wiki/Windows_Script_Host).
  20366. */
  20367. wsh : true,
  20368. /**
  20369. * This option defines globals available when your code is running inside
  20370. * of a Web Worker. [Web
  20371. * Workers](https://developer.mozilla.org/en/Using_web_workers) provide a
  20372. * simple means for web content to run scripts in background threads.
  20373. */
  20374. worker : true,
  20375. /**
  20376. * This option defines non-standard but widely adopted globals such as
  20377. * `escape` and `unescape`.
  20378. */
  20379. nonstandard : true,
  20380. /**
  20381. * This option defines globals exposed by modern browsers: all the way from
  20382. * good old `document` and `navigator` to the HTML5 `FileReader` and other
  20383. * new developments in the browser world.
  20384. *
  20385. * **Note:** This option doesn't expose variables like `alert` or
  20386. * `console`. See option `devel` for more information.
  20387. */
  20388. browser : true,
  20389. /**
  20390. * This option defines globals available when using [the Browserify
  20391. * tool](http://browserify.org/) to build a project.
  20392. */
  20393. browserify : true,
  20394. /**
  20395. * This option defines globals that are usually used for logging poor-man's
  20396. * debugging: `console`, `alert`, etc. It is usually a good idea to not
  20397. * ship them in production because, for example, `console.log` breaks in
  20398. * legacy versions of Internet Explorer.
  20399. */
  20400. devel : true,
  20401. /**
  20402. * This option defines globals exposed by the [Dojo
  20403. * Toolkit](http://dojotoolkit.org/).
  20404. */
  20405. dojo : true,
  20406. /**
  20407. * This option defines globals for typed array constructors.
  20408. *
  20409. * More info:
  20410. *
  20411. * * [JavaScript typed
  20412. * arrays](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays)
  20413. */
  20414. typed : true,
  20415. /**
  20416. * This option defines globals available when your core is running inside
  20417. * of the PhantomJS runtime environment. [PhantomJS](http://phantomjs.org/)
  20418. * is a headless WebKit scriptable with a JavaScript API. It has fast and
  20419. * native support for various web standards: DOM handling, CSS selector,
  20420. * JSON, Canvas, and SVG.
  20421. */
  20422. phantom : true
  20423. },
  20424. // Obsolete options
  20425. obsolete: {
  20426. onecase : true, // if one case switch statements should be allowed
  20427. regexp : true, // if the . should not be allowed in regexp literals
  20428. regexdash : true // if unescaped first/last dash (-) inside brackets
  20429. // should be tolerated
  20430. }
  20431. };
  20432. // These are the JSHint options that can take any value
  20433. // (we use this object to detect invalid options)
  20434. exports.val = {
  20435. /**
  20436. * This option lets you set the maximum length of a line.
  20437. *
  20438. * @deprecated JSHint is limiting its scope to issues of code correctness. If
  20439. * you would like to enforce rules relating to code style, check
  20440. * out [the JSCS project](https://github.com/jscs-dev/node-jscs).
  20441. */
  20442. maxlen : false,
  20443. /**
  20444. * This option sets a specific tab width for your code.
  20445. *
  20446. * @deprecated JSHint is limiting its scope to issues of code correctness. If
  20447. * you would like to enforce rules relating to code style, check
  20448. * out [the JSCS project](https://github.com/jscs-dev/node-jscs).
  20449. */
  20450. indent : false,
  20451. /**
  20452. * This options allows you to set the maximum amount of errors JSHint will
  20453. * produce before giving up. Default is 50.
  20454. */
  20455. maxerr : false,
  20456. /**
  20457. * This option allows you to control which variables JSHint considers to be
  20458. * implicitly defined in the environment. Configure it with an array of
  20459. * string values. Prefixing a variable name with a hyphen (-) character will
  20460. * remove that name from the collection of predefined variables.
  20461. *
  20462. * JSHint will consider variables declared in this way to be read-only.
  20463. *
  20464. * This option cannot be specified in-line; it may only be used via the
  20465. * JavaScript API or from an external configuration file.
  20466. */
  20467. predef : false,
  20468. /**
  20469. * This option can be used to specify a white list of global variables that
  20470. * are not formally defined in the source code. This is most useful when
  20471. * combined with the `undef` option in order to suppress warnings for
  20472. * project-specific global variables.
  20473. *
  20474. * Setting an entry to `true` enables reading and writing to that variable.
  20475. * Setting it to `false` will trigger JSHint to consider that variable
  20476. * read-only.
  20477. *
  20478. * See also the "environment" options: a set of options to be used as short
  20479. * hand for enabling global variables defined in common JavaScript
  20480. * environments.
  20481. *
  20482. * To configure `globals` within an individual file, see [Inline
  20483. * Configuration](http://jshint.com/docs/#inline-configuration).
  20484. */
  20485. globals : false,
  20486. /**
  20487. * This option enforces the consistency of quotation marks used throughout
  20488. * your code. It accepts three values: `true` if you don't want to enforce
  20489. * one particular style but want some consistency, `"single"` if you want to
  20490. * allow only single quotes and `"double"` if you want to allow only double
  20491. * quotes.
  20492. *
  20493. * @deprecated JSHint is limiting its scope to issues of code correctness. If
  20494. * you would like to enforce rules relating to code style, check
  20495. * out [the JSCS project](https://github.com/jscs-dev/node-jscs).
  20496. */
  20497. quotmark : false,
  20498. scope : false,
  20499. /**
  20500. * This option lets you set the max number of statements allowed per function:
  20501. *
  20502. * // jshint maxstatements:4
  20503. *
  20504. * function main() {
  20505. * var i = 0;
  20506. * var j = 0;
  20507. *
  20508. * // Function declarations count as one statement. Their bodies
  20509. * // don't get taken into account for the outer function.
  20510. * function inner() {
  20511. * var i2 = 1;
  20512. * var j2 = 1;
  20513. *
  20514. * return i2 + j2;
  20515. * }
  20516. *
  20517. * j = i + j;
  20518. * return j; // JSHint: Too many statements per function. (5)
  20519. * }
  20520. */
  20521. maxstatements: false,
  20522. /**
  20523. * This option lets you control how nested do you want your blocks to be:
  20524. *
  20525. * // jshint maxdepth:2
  20526. *
  20527. * function main(meaning) {
  20528. * var day = true;
  20529. *
  20530. * if (meaning === 42) {
  20531. * while (day) {
  20532. * shuffle();
  20533. *
  20534. * if (tired) { // JSHint: Blocks are nested too deeply (3).
  20535. * sleep();
  20536. * }
  20537. * }
  20538. * }
  20539. * }
  20540. */
  20541. maxdepth : false,
  20542. /**
  20543. * This option lets you set the max number of formal parameters allowed per
  20544. * function:
  20545. *
  20546. * // jshint maxparams:3
  20547. *
  20548. * function login(request, onSuccess) {
  20549. * // ...
  20550. * }
  20551. *
  20552. * // JSHint: Too many parameters per function (4).
  20553. * function logout(request, isManual, whereAmI, onSuccess) {
  20554. * // ...
  20555. * }
  20556. */
  20557. maxparams : false,
  20558. /**
  20559. * This option lets you control cyclomatic complexity throughout your code.
  20560. * Cyclomatic complexity measures the number of linearly independent paths
  20561. * through a program's source code. Read more about [cyclomatic complexity on
  20562. * Wikipedia](http://en.wikipedia.org/wiki/Cyclomatic_complexity).
  20563. */
  20564. maxcomplexity: false,
  20565. /**
  20566. * This option suppresses warnings about variable shadowing i.e. declaring a
  20567. * variable that had been already declared somewhere in the outer scope.
  20568. *
  20569. * - "inner" - check for variables defined in the same scope only
  20570. * - "outer" - check for variables defined in outer scopes as well
  20571. * - false - same as inner
  20572. * - true - allow variable shadowing
  20573. */
  20574. shadow : false,
  20575. /**
  20576. * This option requires the code to run in ECMAScript 5's strict mode.
  20577. * [Strict mode](https://developer.mozilla.org/en/JavaScript/Strict_mode)
  20578. * is a way to opt in to a restricted variant of JavaScript. Strict mode
  20579. * eliminates some JavaScript pitfalls that didn't cause errors by changing
  20580. * them to produce errors. It also fixes mistakes that made it difficult
  20581. * for the JavaScript engines to perform certain optimizations.
  20582. *
  20583. * - "global" - there must be a `"use strict";` directive at global level
  20584. * - "implied" - lint the code as if there is the `"use strict";` directive
  20585. * - false - disable warnings about strict mode
  20586. * - true - there must be a `"use strict";` directive at function level;
  20587. * this is preferable for scripts intended to be loaded in web
  20588. * browsers directly because enabling strict mode globally
  20589. * could adversely effect other scripts running on the same
  20590. * page
  20591. */
  20592. strict : true,
  20593. /**
  20594. * This option warns when you define and never use your variables. It is very
  20595. * useful for general code cleanup, especially when used in addition to
  20596. * `undef`.
  20597. *
  20598. * // jshint unused:true
  20599. *
  20600. * function test(a, b) {
  20601. * var c, d = 2;
  20602. *
  20603. * return a + d;
  20604. * }
  20605. *
  20606. * test(1, 2);
  20607. *
  20608. * // Line 3: 'b' was defined but never used.
  20609. * // Line 4: 'c' was defined but never used.
  20610. *
  20611. * In addition to that, this option will warn you about unused global
  20612. * variables declared via the `global` directive.
  20613. *
  20614. * When set to `true`, unused parameters that are followed by a used
  20615. * parameter will not produce warnings. This option can be set to `vars` to
  20616. * only check for variables, not function parameters, or `strict` to check
  20617. * all variables and parameters.
  20618. */
  20619. unused : true,
  20620. /**
  20621. * This option prohibits the use of a variable before it was defined.
  20622. * JavaScript has function scope only and, in addition to that, all variables
  20623. * are always moved—or hoisted— to the top of the function. This behavior can
  20624. * lead to some very nasty bugs and that's why it is safer to always use
  20625. * variable only after they have been explicitly defined.
  20626. *
  20627. * Setting this option to "nofunc" will allow function declarations to be
  20628. * ignored.
  20629. *
  20630. * For more in-depth understanding of scoping and hoisting in JavaScript,
  20631. * read [JavaScript Scoping and
  20632. * Hoisting](http://www.adequatelygood.com/2010/2/JavaScript-Scoping-and-Hoisting)
  20633. * by Ben Cherry.
  20634. */
  20635. latedef : false,
  20636. ignore : false, // start/end ignoring lines of code, bypassing the lexer
  20637. // start - start ignoring lines, including the current line
  20638. // end - stop ignoring lines, starting on the next line
  20639. // line - ignore warnings / errors for just a single line
  20640. // (this option does not bypass the lexer)
  20641. ignoreDelimiters: false, // array of start/end delimiters used to ignore
  20642. // certain chunks from code
  20643. /**
  20644. * This option is used to specify the ECMAScript version to which the code
  20645. * must adhere. It can assume one of the following values:
  20646. * - `3` - If you need your program to be executable
  20647. * in older browsers—such as Internet Explorer 6/7/8/9—and other legacy
  20648. * JavaScript environments
  20649. * - `5` - To enable syntax first defined in [the ECMAScript 5.1
  20650. * specification](http://www.ecma-international.org/ecma-262/5.1/index.html).
  20651. * This includes allowing reserved keywords as object properties.
  20652. * - `6` - To tell JSHint that your code uses [ECMAScript
  20653. * 6](http://www.ecma-international.org/ecma-262/6.0/index.html) specific
  20654. * syntax. Note that not all browsers implement them.
  20655. * - `7` - To enable language features introduced by [ECMAScript
  20656. * 7](https://www.ecma-international.org/ecma-262/7.0/index.html). Notable
  20657. * additions: the exponentiation operator.
  20658. * - `8` - To enable language features introduced by [ECMAScript
  20659. * 8](https://www.ecma-international.org/ecma-262/8.0/index.html). Notable
  20660. * additions: async functions, shared memory, and atomics
  20661. * - `9` - To enable language features introduced by [ECMAScript
  20662. * 9](https://www.ecma-international.org/ecma-262/9.0/index.html). Notable
  20663. * additions: asynchronous iteration, rest/spread properties, and various
  20664. * RegExp extensions
  20665. * - `10` - To enable language features introduced by [ECMAScript
  20666. * 10](https://www.ecma-international.org/ecma-262/10.0/index.html).
  20667. * Notable additions: optional catch bindings.
  20668. * - `11` - To enable language features introduced by ECMAScript 11. Notable
  20669. * additions: "export * as ns from 'module'", `import.meta`, the nullish
  20670. * coalescing operator, and optional chaining, and dynamic import.
  20671. */
  20672. esversion: 5
  20673. };
  20674. /**
  20675. * Unstable options allow control for parsing and linting of proposed additions
  20676. * to the JavaScript language. Just like the language features they describe,
  20677. * the presence and behavior of these options is volatile; JSHint reserves the
  20678. * right to remove or modify them between major version releases.
  20679. */
  20680. exports.unstable = {
  20681. };
  20682. // These are JSHint boolean options which are shared with JSLint
  20683. // where the definition in JSHint is opposite JSLint
  20684. exports.inverted = {
  20685. bitwise : true,
  20686. forin : true,
  20687. newcap : true,
  20688. plusplus: true,
  20689. regexp : true,
  20690. undef : true,
  20691. // Inverted and renamed, use JSHint name here
  20692. eqeqeq : true,
  20693. strict : true
  20694. };
  20695. exports.validNames = Object.keys(exports.val)
  20696. .concat(Object.keys(exports.bool.relaxing))
  20697. .concat(Object.keys(exports.bool.enforcing))
  20698. .concat(Object.keys(exports.bool.obsolete))
  20699. .concat(Object.keys(exports.bool.environments))
  20700. .concat(["unstable"]);
  20701. exports.unstableNames = Object.keys(exports.unstable);
  20702. // These are JSHint boolean options which are shared with JSLint
  20703. // where the name has been changed but the effect is unchanged
  20704. exports.renamed = {
  20705. eqeq : "eqeqeq",
  20706. windows: "wsh",
  20707. sloppy : "strict"
  20708. };
  20709. exports.removed = {
  20710. nomen: true,
  20711. onevar: true,
  20712. passfail: true,
  20713. white: true,
  20714. gcl: true,
  20715. smarttabs: true,
  20716. trailing: true
  20717. };
  20718. // Add options here which should not be automatically enforced by
  20719. // `enforceall`.
  20720. exports.noenforceall = {
  20721. varstmt: true,
  20722. strict: true,
  20723. regexpu: true
  20724. };
  20725. },{}],21:[function(require,module,exports){
  20726. /**
  20727. * This module defines a set of enum-like values intended for use as bit
  20728. * "flags" during parsing. The ECMAScript grammar defines a number of such
  20729. * "production parameters" to control how certain forms are parsed in context.
  20730. * JSHint implements additional parameters to facilitate detection of lint
  20731. * warnings.
  20732. *
  20733. * An equivalent implementation which described the context in terms of a
  20734. * "lookup table" object would be more idiomatic for a JavaScript project like
  20735. * JSHint. However, because the number of contexts scales with the number of
  20736. * expressions in the input program, this would have non-negligible impact on
  20737. * the process's memory footprint.
  20738. */
  20739. module.exports = {
  20740. /**
  20741. * Enabled when parsing expressions within ES2015 "export" declarations,
  20742. * allowing otherwise-unreferenced bindings to be considered "used".
  20743. */
  20744. export: 1,
  20745. /**
  20746. * Enabled when parsing expressions within the head of `for` statements,
  20747. * allowing to distinguish between `for-in` and "C-style" `for` statements.
  20748. */
  20749. noin: 2,
  20750. /**
  20751. * Enabled when the expression begins the statement, allowing the parser to
  20752. * correctly select between the null denotation ("nud") and first null
  20753. * denotation ("fud") parsing strategy.
  20754. */
  20755. initial: 4,
  20756. preAsync: 8,
  20757. async: 16,
  20758. /**
  20759. * Enabled when any exception thrown by the expression will be caught by a
  20760. * TryStatement.
  20761. */
  20762. tryClause: 32,
  20763. /**
  20764. * Enabled when parsing the body of a generator function.
  20765. */
  20766. yield: 64
  20767. };
  20768. },{}],22:[function(require,module,exports){
  20769. /*
  20770. * Regular expressions. Some of these are stupidly long.
  20771. */
  20772. /*jshint maxlen:1000 */
  20773. "use strict";
  20774. // Unsafe comment or string (ax)
  20775. exports.unsafeString =
  20776. /@cc|<\/?|script|\]\s*\]|<\s*!|&lt/i;
  20777. // Characters in strings that need escaping (nx and nxg)
  20778. exports.needEsc =
  20779. /[\u0000-\u001f&<"\/\\\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/;
  20780. exports.needEscGlobal =
  20781. /[\u0000-\u001f&<"\/\\\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
  20782. // Star slash (lx)
  20783. exports.starSlash = /\*\//;
  20784. // Identifier (ix)
  20785. exports.identifier = /^([a-zA-Z_$][a-zA-Z0-9_$]*)$/;
  20786. // JavaScript URL (jx)
  20787. exports.javascriptURL = /^(?:javascript|jscript|ecmascript|vbscript|livescript)\s*:/i;
  20788. // Catches /* falls through */ comments (ft)
  20789. exports.fallsThrough = /^\s*falls?\sthrough\s*$/;
  20790. // very conservative rule (eg: only one space between the start of the comment and the first character)
  20791. // to relax the maxlen option
  20792. exports.maxlenException = /^(?:(?:\/\/|\/\*|\*) ?)?[^ ]+$/;
  20793. // Node.js releases prior to version 8 include a version of the V8 engine which
  20794. // incorrectly interprets the character class escape `\s`. The following
  20795. // regular expression may be replaced with `/\s/` when JSHint removes support
  20796. // for Node.js versions prior to 8.
  20797. // Source:
  20798. // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp
  20799. exports.whitespace = /[ \f\n\r\t\v\u00a0\u1680\u2000-\u200a\u2028\u2029\u202f\u205f\u3000\ufeff]/;
  20800. exports.nonzeroDigit = /^[1-9]$/;
  20801. exports.decimalDigit = /^[0-9]$/;
  20802. exports.regexpSyntaxChars = /[\^$\\.*+?()[\]{}|]/;
  20803. exports.regexpQuantifiers = /[*+?{]/;
  20804. exports.regexpControlEscapes = /[fnrtv]/;
  20805. exports.regexpCharClasses = /[dDsSwWpP]/;
  20806. // Identifies the "dot" atom in regular expressions
  20807. exports.regexpDot = /(^|[^\\])(\\\\)*\./;
  20808. },{}],23:[function(require,module,exports){
  20809. "use strict";
  20810. /**
  20811. * A note on `__proto__`:
  20812. *
  20813. * This file uses ordinary objects to track identifiers that are observed in
  20814. * the input source code. It creates these objects using `Object.create` so
  20815. * that the tracking objects have no prototype, allowing the `__proto__`
  20816. * property to be used to store a value *without* triggering the invocation of
  20817. * the built-in `Object.prototype.__proto__` accessor method. Some environments
  20818. * (e.g. PhantomJS) do not implement the correct semantics for property
  20819. * enumeration. In those environments, methods like `Object.keys` and Lodash's
  20820. * `values` do not include the property name. This file includes a number of
  20821. * branches which ensure that JSHint behaves consistently in those
  20822. * environments. The branches must be ignored by the test coverage verification
  20823. * system because the workaround is not necessary in the environment where
  20824. * coverage is verified (i.e. Node.js).
  20825. */
  20826. var _ = require("lodash");
  20827. var events = require("events");
  20828. // Used to denote membership in lookup tables (a primitive value such as `true`
  20829. // would be silently rejected for the property name "__proto__" in some
  20830. // environments)
  20831. var marker = {};
  20832. /**
  20833. * A factory function for creating scope managers. A scope manager tracks
  20834. * bindings, detecting when variables are referenced (through "usages").
  20835. *
  20836. * @param {object} state - the global state object (see `state.js`)
  20837. * @param {Array} predefined - a set of binding names for built-in bindings
  20838. * provided by the environment
  20839. * @param {object} exported - a hash for binding names that are intended to be
  20840. * referenced in contexts beyond the current program
  20841. * code
  20842. * @param {object} declared - a hash for binding names that were defined as
  20843. * global bindings via linting configuration
  20844. *
  20845. * @returns {object} - a scope manager
  20846. */
  20847. var scopeManager = function(state, predefined, exported, declared) {
  20848. var _current;
  20849. var _scopeStack = [];
  20850. function _newScope(type) {
  20851. _current = {
  20852. "(bindings)": Object.create(null),
  20853. "(usages)": Object.create(null),
  20854. "(labels)": Object.create(null),
  20855. "(parent)": _current,
  20856. "(type)": type,
  20857. "(params)": (type === "functionparams" || type === "catchparams") ? [] : null
  20858. };
  20859. _scopeStack.push(_current);
  20860. }
  20861. _newScope("global");
  20862. _current["(predefined)"] = predefined;
  20863. var _currentFunctBody = _current; // this is the block after the params = function
  20864. var usedPredefinedAndGlobals = Object.create(null);
  20865. var impliedGlobals = Object.create(null);
  20866. var unuseds = [];
  20867. var esModuleExports = [];
  20868. var emitter = new events.EventEmitter();
  20869. function warning(code, token) {
  20870. emitter.emit("warning", {
  20871. code: code,
  20872. token: token,
  20873. data: _.slice(arguments, 2)
  20874. });
  20875. }
  20876. function error(code, token) {
  20877. emitter.emit("warning", {
  20878. code: code,
  20879. token: token,
  20880. data: _.slice(arguments, 2)
  20881. });
  20882. }
  20883. function _setupUsages(bindingName) {
  20884. if (!_current["(usages)"][bindingName]) {
  20885. _current["(usages)"][bindingName] = {
  20886. "(modified)": [],
  20887. "(reassigned)": [],
  20888. "(tokens)": []
  20889. };
  20890. }
  20891. }
  20892. var _getUnusedOption = function(unused_opt) {
  20893. if (unused_opt === undefined) {
  20894. unused_opt = state.option.unused;
  20895. }
  20896. if (unused_opt === true) {
  20897. unused_opt = "last-param";
  20898. }
  20899. return unused_opt;
  20900. };
  20901. var _warnUnused = function(name, tkn, type, unused_opt) {
  20902. var line = tkn.line;
  20903. var chr = tkn.from;
  20904. var raw_name = tkn.raw_text || name;
  20905. unused_opt = _getUnusedOption(unused_opt);
  20906. var warnable_types = {
  20907. "vars": ["var"],
  20908. "last-param": ["var", "param"],
  20909. "strict": ["var", "param", "last-param"]
  20910. };
  20911. if (unused_opt) {
  20912. if (warnable_types[unused_opt] && warnable_types[unused_opt].indexOf(type) !== -1) {
  20913. warning("W098", { line: line, from: chr }, raw_name);
  20914. }
  20915. }
  20916. // inconsistent - see gh-1894
  20917. if (unused_opt || type === "var") {
  20918. unuseds.push({
  20919. name: name,
  20920. line: line,
  20921. character: chr
  20922. });
  20923. }
  20924. };
  20925. /**
  20926. * Check the current scope for unused identifiers
  20927. */
  20928. function _checkForUnused() {
  20929. if (_current["(type)"] !== "functionparams") {
  20930. var currentBindings = _current["(bindings)"];
  20931. for (var bindingName in currentBindings) {
  20932. if (currentBindings[bindingName]["(type)"] !== "exception" &&
  20933. currentBindings[bindingName]["(unused)"]) {
  20934. _warnUnused(bindingName, currentBindings[bindingName]["(token)"], "var");
  20935. }
  20936. }
  20937. return;
  20938. }
  20939. // Check the current scope for unused parameters and issue warnings as
  20940. // necessary.
  20941. var params = _current["(params)"];
  20942. var param = params.pop();
  20943. var unused_opt;
  20944. while (param) {
  20945. var binding = _current["(bindings)"][param];
  20946. unused_opt = _getUnusedOption(state.funct["(unusedOption)"]);
  20947. // 'undefined' is a special case for the common pattern where `undefined`
  20948. // is used as a formal parameter name to defend against global
  20949. // re-assignment, e.g.
  20950. //
  20951. // (function(window, undefined) {
  20952. // })();
  20953. if (param === "undefined")
  20954. return;
  20955. if (binding["(unused)"]) {
  20956. _warnUnused(param, binding["(token)"], "param", state.funct["(unusedOption)"]);
  20957. } else if (unused_opt === "last-param") {
  20958. return;
  20959. }
  20960. param = params.pop();
  20961. }
  20962. }
  20963. /**
  20964. * Find the relevant binding's scope. The owning scope is located by first
  20965. * inspecting the current scope and then moving "downward" through the stack
  20966. * of scopes.
  20967. *
  20968. * @param {string} bindingName - the value of the identifier
  20969. *
  20970. * @returns {Object} - the scope in which the binding was found
  20971. */
  20972. function _getBinding(bindingName) {
  20973. for (var i = _scopeStack.length - 1 ; i >= 0; --i) {
  20974. var scopeBindings = _scopeStack[i]["(bindings)"];
  20975. if (scopeBindings[bindingName]) {
  20976. return scopeBindings;
  20977. }
  20978. }
  20979. }
  20980. /**
  20981. * Determine if a given binding name has been referenced within the current
  20982. * function or any function defined within.
  20983. *
  20984. * @param {string} bindingName - the value of the identifier
  20985. *
  20986. * @returns {boolean}
  20987. */
  20988. function usedSoFarInCurrentFunction(bindingName) {
  20989. for (var i = _scopeStack.length - 1; i >= 0; i--) {
  20990. var current = _scopeStack[i];
  20991. if (current["(usages)"][bindingName]) {
  20992. return current["(usages)"][bindingName];
  20993. }
  20994. if (current === _currentFunctBody) {
  20995. break;
  20996. }
  20997. }
  20998. return false;
  20999. }
  21000. function _checkOuterShadow(bindingName, token) {
  21001. // only check if shadow is outer
  21002. if (state.option.shadow !== "outer") {
  21003. return;
  21004. }
  21005. var isGlobal = _currentFunctBody["(type)"] === "global",
  21006. isNewFunction = _current["(type)"] === "functionparams";
  21007. var outsideCurrentFunction = !isGlobal;
  21008. for (var i = 0; i < _scopeStack.length; i++) {
  21009. var stackItem = _scopeStack[i];
  21010. if (!isNewFunction && _scopeStack[i + 1] === _currentFunctBody) {
  21011. outsideCurrentFunction = false;
  21012. }
  21013. if (outsideCurrentFunction && stackItem["(bindings)"][bindingName]) {
  21014. warning("W123", token, bindingName);
  21015. }
  21016. if (stackItem["(labels)"][bindingName]) {
  21017. warning("W123", token, bindingName);
  21018. }
  21019. }
  21020. }
  21021. function _latedefWarning(type, bindingName, token) {
  21022. var isFunction;
  21023. if (state.option.latedef) {
  21024. isFunction = type === "function" || type === "generator function" ||
  21025. type === "async function";
  21026. // if either latedef is strict and this is a function
  21027. // or this is not a function
  21028. if ((state.option.latedef === true && isFunction) || !isFunction) {
  21029. warning("W003", token, bindingName);
  21030. }
  21031. }
  21032. }
  21033. var scopeManagerInst = {
  21034. on: function(names, listener) {
  21035. names.split(" ").forEach(function(name) {
  21036. emitter.on(name, listener);
  21037. });
  21038. },
  21039. isPredefined: function(bindingName) {
  21040. return !this.has(bindingName) && _.has(_scopeStack[0]["(predefined)"], bindingName);
  21041. },
  21042. /**
  21043. * Create a new scope within the current scope. As the topmost value, the
  21044. * new scope will be interpreted as the current scope until it is
  21045. * exited--see the `unstack` method.
  21046. *
  21047. * @param {string} [type] - The type of the scope. Valid values are
  21048. * "functionparams", "catchparams" and
  21049. * "functionouter"
  21050. */
  21051. stack: function(type) {
  21052. var previousScope = _current;
  21053. _newScope(type);
  21054. if (!type && previousScope["(type)"] === "functionparams") {
  21055. _current["(isFuncBody)"] = true;
  21056. _currentFunctBody = _current;
  21057. }
  21058. },
  21059. /**
  21060. * Valldate all binding references and declarations in the current scope
  21061. * and set the next scope on the stack as the active scope.
  21062. */
  21063. unstack: function() {
  21064. // jshint proto: true
  21065. var subScope = _scopeStack.length > 1 ? _scopeStack[_scopeStack.length - 2] : null;
  21066. var isUnstackingFunctionBody = _current === _currentFunctBody,
  21067. isUnstackingFunctionParams = _current["(type)"] === "functionparams",
  21068. isUnstackingFunctionOuter = _current["(type)"] === "functionouter";
  21069. var i, j, isImmutable, isFunction;
  21070. var currentUsages = _current["(usages)"];
  21071. var currentBindings = _current["(bindings)"];
  21072. var usedBindingNameList = Object.keys(currentUsages);
  21073. // See comment, "A note on `__proto__`"
  21074. /* istanbul ignore if */
  21075. if (currentUsages.__proto__ && usedBindingNameList.indexOf("__proto__") === -1) {
  21076. usedBindingNameList.push("__proto__");
  21077. }
  21078. for (i = 0; i < usedBindingNameList.length; i++) {
  21079. var usedBindingName = usedBindingNameList[i];
  21080. var usage = currentUsages[usedBindingName];
  21081. var usedBinding = currentBindings[usedBindingName];
  21082. if (usedBinding) {
  21083. var usedBindingType = usedBinding["(type)"];
  21084. isImmutable = usedBindingType === "const" || usedBindingType === "import";
  21085. if (usedBinding["(useOutsideOfScope)"] && !state.option.funcscope) {
  21086. var usedTokens = usage["(tokens)"];
  21087. for (j = 0; j < usedTokens.length; j++) {
  21088. // Keep the consistency of https://github.com/jshint/jshint/issues/2409
  21089. if (usedBinding["(function)"] === usedTokens[j]["(function)"]) {
  21090. error("W038", usedTokens[j], usedBindingName);
  21091. }
  21092. }
  21093. }
  21094. // mark the binding used
  21095. _current["(bindings)"][usedBindingName]["(unused)"] = false;
  21096. // check for modifying a const
  21097. if (isImmutable && usage["(modified)"]) {
  21098. for (j = 0; j < usage["(modified)"].length; j++) {
  21099. error("E013", usage["(modified)"][j], usedBindingName);
  21100. }
  21101. }
  21102. isFunction = usedBindingType === "function" ||
  21103. usedBindingType === "generator function" ||
  21104. usedBindingType === "async function";
  21105. // check for re-assigning a function declaration
  21106. if ((isFunction || usedBindingType === "class") && usage["(reassigned)"]) {
  21107. for (j = 0; j < usage["(reassigned)"].length; j++) {
  21108. if (!usage["(reassigned)"][j].ignoreW021) {
  21109. warning("W021", usage["(reassigned)"][j], usedBindingName, usedBindingType);
  21110. }
  21111. }
  21112. }
  21113. continue;
  21114. }
  21115. if (subScope) {
  21116. var bindingType = this.bindingtype(usedBindingName);
  21117. isImmutable = bindingType === "const" ||
  21118. (bindingType === null && _scopeStack[0]["(predefined)"][usedBindingName] === false);
  21119. if (isUnstackingFunctionOuter && !isImmutable) {
  21120. if (!state.funct["(outerMutables)"]) {
  21121. state.funct["(outerMutables)"] = [];
  21122. }
  21123. state.funct["(outerMutables)"].push(usedBindingName);
  21124. }
  21125. // not exiting the global scope, so copy the usage down in case its an out of scope usage
  21126. if (!subScope["(usages)"][usedBindingName]) {
  21127. subScope["(usages)"][usedBindingName] = usage;
  21128. if (isUnstackingFunctionBody) {
  21129. subScope["(usages)"][usedBindingName]["(onlyUsedSubFunction)"] = true;
  21130. }
  21131. } else {
  21132. var subScopeUsage = subScope["(usages)"][usedBindingName];
  21133. subScopeUsage["(modified)"] = subScopeUsage["(modified)"].concat(usage["(modified)"]);
  21134. subScopeUsage["(tokens)"] = subScopeUsage["(tokens)"].concat(usage["(tokens)"]);
  21135. subScopeUsage["(reassigned)"] =
  21136. subScopeUsage["(reassigned)"].concat(usage["(reassigned)"]);
  21137. }
  21138. } else {
  21139. // this is exiting global scope, so we finalise everything here - we are at the end of the file
  21140. if (typeof _current["(predefined)"][usedBindingName] === "boolean") {
  21141. // remove the declared token, so we know it is used
  21142. delete declared[usedBindingName];
  21143. // note it as used so it can be reported
  21144. usedPredefinedAndGlobals[usedBindingName] = marker;
  21145. // check for re-assigning a read-only (set to false) predefined
  21146. if (_current["(predefined)"][usedBindingName] === false && usage["(reassigned)"]) {
  21147. for (j = 0; j < usage["(reassigned)"].length; j++) {
  21148. if (!usage["(reassigned)"][j].ignoreW020) {
  21149. warning("W020", usage["(reassigned)"][j]);
  21150. }
  21151. }
  21152. }
  21153. }
  21154. else {
  21155. // binding usage is not predefined and we have not found a declaration
  21156. // so report as undeclared
  21157. for (j = 0; j < usage["(tokens)"].length; j++) {
  21158. var undefinedToken = usage["(tokens)"][j];
  21159. // if its not a forgiven undefined (e.g. typof x)
  21160. if (!undefinedToken.forgiveUndef) {
  21161. // if undef is on and undef was on when the token was defined
  21162. if (state.option.undef && !undefinedToken.ignoreUndef) {
  21163. warning("W117", undefinedToken, usedBindingName);
  21164. }
  21165. if (impliedGlobals[usedBindingName]) {
  21166. impliedGlobals[usedBindingName].line.push(undefinedToken.line);
  21167. } else {
  21168. impliedGlobals[usedBindingName] = {
  21169. name: usedBindingName,
  21170. line: [undefinedToken.line]
  21171. };
  21172. }
  21173. }
  21174. }
  21175. }
  21176. }
  21177. }
  21178. // if exiting the global scope, we can warn about declared globals that haven't been used yet
  21179. if (!subScope) {
  21180. Object.keys(declared)
  21181. .forEach(function(bindingNotUsed) {
  21182. _warnUnused(bindingNotUsed, declared[bindingNotUsed], "var");
  21183. });
  21184. }
  21185. // If this is not a function boundary, transfer function-scoped bindings to
  21186. // the parent block (a rough simulation of variable hoisting). Previously
  21187. // existing bindings in the parent block should take precedence so that
  21188. // prior usages are not discarded.
  21189. if (subScope && !isUnstackingFunctionBody &&
  21190. !isUnstackingFunctionParams && !isUnstackingFunctionOuter) {
  21191. var bindingNames = Object.keys(currentBindings);
  21192. for (i = 0; i < bindingNames.length; i++) {
  21193. var defBindingName = bindingNames[i];
  21194. var defBinding = currentBindings[defBindingName];
  21195. if (!defBinding["(blockscoped)"] && defBinding["(type)"] !== "exception") {
  21196. var shadowed = subScope["(bindings)"][defBindingName];
  21197. // Do not overwrite a binding if it exists in the parent scope
  21198. // because it is shared by adjacent blocks. Copy the `unused`
  21199. // property so that any references found within the current block
  21200. // are counted toward that higher-level declaration.
  21201. if (shadowed) {
  21202. shadowed["(unused)"] &= defBinding["(unused)"];
  21203. // "Hoist" the variable to the parent block, decorating the binding
  21204. // so that future references, though technically valid, can be
  21205. // reported as "out-of-scope" in the absence of the `funcscope`
  21206. // option.
  21207. } else {
  21208. defBinding["(useOutsideOfScope)"] =
  21209. // Do not warn about out-of-scope usages in the global scope
  21210. _currentFunctBody["(type)"] !== "global" &&
  21211. // When a higher scope contains a binding for the binding, the
  21212. // binding is a re-declaration and should not prompt "used
  21213. // out-of-scope" warnings.
  21214. !this.funct.has(defBindingName, { excludeCurrent: true });
  21215. subScope["(bindings)"][defBindingName] = defBinding;
  21216. }
  21217. delete currentBindings[defBindingName];
  21218. }
  21219. }
  21220. }
  21221. _checkForUnused();
  21222. _scopeStack.pop();
  21223. if (isUnstackingFunctionBody) {
  21224. _currentFunctBody = _scopeStack[_.findLastIndex(_scopeStack, function(scope) {
  21225. // if function or if global (which is at the bottom so it will only return true if we call back)
  21226. return scope["(isFuncBody)"] || scope["(type)"] === "global";
  21227. })];
  21228. }
  21229. _current = subScope;
  21230. },
  21231. /**
  21232. * Add a function parameter to the current scope.
  21233. *
  21234. * @param {string} bindingName - the value of the identifier
  21235. * @param {Token} token
  21236. * @param {string} [type] - binding type; defaults to "param"
  21237. */
  21238. addParam: function(bindingName, token, type) {
  21239. type = type || "param";
  21240. if (type === "exception") {
  21241. // if defined in the current function
  21242. var previouslyDefinedBindingType = this.funct.bindingtype(bindingName);
  21243. if (previouslyDefinedBindingType && previouslyDefinedBindingType !== "exception") {
  21244. // and has not been used yet in the current function scope
  21245. if (!state.option.node) {
  21246. warning("W002", state.tokens.next, bindingName);
  21247. }
  21248. }
  21249. if (state.isStrict() && (bindingName === "arguments" || bindingName === "eval")) {
  21250. warning("E008", token);
  21251. }
  21252. }
  21253. // The variable was declared in the current scope
  21254. if (_.has(_current["(bindings)"], bindingName)) {
  21255. _current["(bindings)"][bindingName].duplicated = true;
  21256. // The variable was declared in an outer scope
  21257. } else {
  21258. // if this scope has the variable defined, it's a re-definition error
  21259. _checkOuterShadow(bindingName, token);
  21260. _current["(bindings)"][bindingName] = {
  21261. "(type)" : type,
  21262. "(token)": token,
  21263. "(unused)": true };
  21264. _current["(params)"].push(bindingName);
  21265. }
  21266. if (_.has(_current["(usages)"], bindingName)) {
  21267. var usage = _current["(usages)"][bindingName];
  21268. // if its in a sub function it is not necessarily an error, just latedef
  21269. if (usage["(onlyUsedSubFunction)"]) {
  21270. _latedefWarning(type, bindingName, token);
  21271. } else {
  21272. // this is a clear illegal usage, but not a syntax error, so emit a
  21273. // warning and not an error
  21274. warning("W003", token, bindingName);
  21275. }
  21276. }
  21277. },
  21278. validateParams: function(isArrow) {
  21279. var isStrict = state.isStrict();
  21280. var currentFunctParamScope = _currentFunctBody["(parent)"];
  21281. // From ECMAScript 2017:
  21282. //
  21283. // > 14.1.2Static Semantics: Early Errors
  21284. // >
  21285. // > [...]
  21286. // > - It is a Syntax Error if IsSimpleParameterList of
  21287. // > FormalParameterList is false and BoundNames of FormalParameterList
  21288. // > contains any duplicate elements.
  21289. var isSimple = state.funct['(hasSimpleParams)'];
  21290. // Method definitions are defined in terms of UniqueFormalParameters, so
  21291. // they cannot support duplicate parameter names regardless of strict
  21292. // mode.
  21293. var isMethod = state.funct["(method)"];
  21294. if (!currentFunctParamScope["(params)"]) {
  21295. /* istanbul ignore next */
  21296. return;
  21297. }
  21298. currentFunctParamScope["(params)"].forEach(function(bindingName) {
  21299. var binding = currentFunctParamScope["(bindings)"][bindingName];
  21300. if (binding.duplicated) {
  21301. if (isStrict || isArrow || isMethod || !isSimple) {
  21302. warning("E011", binding["(token)"], bindingName);
  21303. } else if (state.option.shadow !== true) {
  21304. warning("W004", binding["(token)"], bindingName);
  21305. }
  21306. }
  21307. if (isStrict && (bindingName === "arguments" || bindingName === "eval")) {
  21308. warning("E008", binding["(token)"]);
  21309. }
  21310. });
  21311. },
  21312. getUsedOrDefinedGlobals: function() {
  21313. // jshint proto: true
  21314. var list = Object.keys(usedPredefinedAndGlobals);
  21315. // See comment, "A note on `__proto__`"
  21316. /* istanbul ignore if */
  21317. if (usedPredefinedAndGlobals.__proto__ === marker &&
  21318. list.indexOf("__proto__") === -1) {
  21319. list.push("__proto__");
  21320. }
  21321. return list;
  21322. },
  21323. /**
  21324. * Get an array of implied globals
  21325. *
  21326. * @returns {Array.<{ name: string, line: Array.<number>}>}
  21327. */
  21328. getImpliedGlobals: function() {
  21329. // jshint proto: true
  21330. var values = _.values(impliedGlobals);
  21331. var hasProto = false;
  21332. // See comment, "A note on `__proto__`"
  21333. if (impliedGlobals.__proto__) {
  21334. hasProto = values.some(function(value) {
  21335. return value.name === "__proto__";
  21336. });
  21337. /* istanbul ignore if */
  21338. if (!hasProto) {
  21339. values.push(impliedGlobals.__proto__);
  21340. }
  21341. }
  21342. return values;
  21343. },
  21344. /**
  21345. * Get an array of objects describing unused bindings.
  21346. *
  21347. * @returns {Array<Object>}
  21348. */
  21349. getUnuseds: function() {
  21350. return unuseds;
  21351. },
  21352. /**
  21353. * Determine if a given name has been defined in the current scope or any
  21354. * lower scope.
  21355. *
  21356. * @param {string} bindingName - the value of the identifier
  21357. *
  21358. * @return {boolean}
  21359. */
  21360. has: function(bindingName) {
  21361. return Boolean(_getBinding(bindingName));
  21362. },
  21363. /**
  21364. * Retrieve binding described by `bindingName` or null
  21365. *
  21366. * @param {string} bindingName - the value of the identifier
  21367. *
  21368. * @returns {string|null} - the type of the binding or `null` if no such
  21369. * binding exists
  21370. */
  21371. bindingtype: function(bindingName) {
  21372. var scopeBindings = _getBinding(bindingName);
  21373. if (scopeBindings) {
  21374. return scopeBindings[bindingName]["(type)"];
  21375. }
  21376. return null;
  21377. },
  21378. /**
  21379. * For the exported options, indicating a variable is used outside the file
  21380. *
  21381. * @param {string} bindingName - the value of the identifier
  21382. */
  21383. addExported: function(bindingName) {
  21384. var globalBindings = _scopeStack[0]["(bindings)"];
  21385. if (_.has(declared, bindingName)) {
  21386. // remove the declared token, so we know it is used
  21387. delete declared[bindingName];
  21388. } else if (_.has(globalBindings, bindingName)) {
  21389. globalBindings[bindingName]["(unused)"] = false;
  21390. } else {
  21391. for (var i = 1; i < _scopeStack.length; i++) {
  21392. var scope = _scopeStack[i];
  21393. // if `scope.(type)` is not defined, it is a block scope
  21394. if (!scope["(type)"]) {
  21395. if (_.has(scope["(bindings)"], bindingName) &&
  21396. !scope["(bindings)"][bindingName]["(blockscoped)"]) {
  21397. scope["(bindings)"][bindingName]["(unused)"] = false;
  21398. return;
  21399. }
  21400. } else {
  21401. break;
  21402. }
  21403. }
  21404. exported[bindingName] = true;
  21405. }
  21406. },
  21407. /**
  21408. * Mark a binding as "exported" by an ES2015 module
  21409. *
  21410. * @param {string} bindingName - the value of the identifier
  21411. * @param {object} token
  21412. */
  21413. setExported: function(localName, exportName) {
  21414. if (exportName) {
  21415. if (esModuleExports.indexOf(exportName.value) > -1) {
  21416. error("E069", exportName, exportName.value);
  21417. }
  21418. esModuleExports.push(exportName.value);
  21419. }
  21420. if (localName) {
  21421. this.block.use(localName.value, localName);
  21422. }
  21423. },
  21424. /**
  21425. * Mark a binding as "initialized." This is necessary to enforce the
  21426. * "temporal dead zone" (TDZ) of block-scoped bindings which are not
  21427. * hoisted.
  21428. *
  21429. * @param {string} bindingName - the value of the identifier
  21430. */
  21431. initialize: function(bindingName) {
  21432. if (_current["(bindings)"][bindingName]) {
  21433. _current["(bindings)"][bindingName]["(initialized)"] = true;
  21434. }
  21435. },
  21436. /**
  21437. * Create a new binding and add it to the current scope. Delegates to the
  21438. * internal `block.add` or `func.add` methods depending on the type.
  21439. * Produces warnings and errors as necessary.
  21440. *
  21441. * @param {string} bindingName
  21442. * @param {Object} opts
  21443. * @param {String} opts.type - the type of the binding e.g. "param", "var",
  21444. * "let, "const", "import", "function",
  21445. * "generator function", "async function",
  21446. * "async generator function"
  21447. * @param {object} opts.token - the token pointing at the declaration
  21448. * @param {boolean} opts.initialized - whether the binding should be
  21449. * created in an "initialized" state.
  21450. */
  21451. addbinding: function(bindingName, opts) {
  21452. var type = opts.type;
  21453. var token = opts.token;
  21454. var isblockscoped = type === "let" || type === "const" ||
  21455. type === "class" || type === "import" || type === "generator function" ||
  21456. type === "async function" || type === "async generator function";
  21457. var ishoisted = type === "function" || type === "generator function" ||
  21458. type === "async function" || type === "import";
  21459. var isexported = (isblockscoped ? _current : _currentFunctBody)["(type)"] === "global" &&
  21460. _.has(exported, bindingName);
  21461. // outer shadow check (inner is only on non-block scoped)
  21462. _checkOuterShadow(bindingName, token);
  21463. if (state.isStrict() && (bindingName === "arguments" || bindingName === "eval")) {
  21464. warning("E008", token);
  21465. }
  21466. if (isblockscoped) {
  21467. var declaredInCurrentScope = _current["(bindings)"][bindingName];
  21468. // for block scoped variables, params are seen in the current scope as the root function
  21469. // scope, so check these too.
  21470. if (!declaredInCurrentScope && _current === _currentFunctBody &&
  21471. _current["(type)"] !== "global") {
  21472. declaredInCurrentScope = !!_currentFunctBody["(parent)"]["(bindings)"][bindingName];
  21473. }
  21474. // if its not already defined (which is an error, so ignore) and is used in TDZ
  21475. if (!declaredInCurrentScope && _current["(usages)"][bindingName]) {
  21476. var usage = _current["(usages)"][bindingName];
  21477. // if its in a sub function it is not necessarily an error, just latedef
  21478. if (usage["(onlyUsedSubFunction)"] || ishoisted) {
  21479. _latedefWarning(type, bindingName, token);
  21480. } else if (!ishoisted) {
  21481. // this is a clear illegal usage for block scoped variables
  21482. warning("E056", token, bindingName, type);
  21483. }
  21484. }
  21485. // If this scope has already declared a binding with the same name,
  21486. // then this represents a redeclaration error if:
  21487. //
  21488. // 1. it is a "hoisted" block-scoped binding within a block. For
  21489. // instance: generator functions may be redeclared in the global
  21490. // scope but not within block statements
  21491. // 2. this is not a "hoisted" block-scoped binding
  21492. if (declaredInCurrentScope &&
  21493. (!ishoisted || (_current["(type)"] !== "global" || type === "import"))) {
  21494. warning("E011", token, bindingName);
  21495. }
  21496. else if (state.option.shadow === "outer") {
  21497. // if shadow is outer, for block scope we want to detect any shadowing within this function
  21498. if (scopeManagerInst.funct.has(bindingName)) {
  21499. warning("W004", token, bindingName);
  21500. }
  21501. }
  21502. scopeManagerInst.block.add(
  21503. bindingName, type, token, !isexported, opts.initialized
  21504. );
  21505. } else {
  21506. var declaredInCurrentFunctionScope = scopeManagerInst.funct.has(bindingName);
  21507. // check for late definition, ignore if already declared
  21508. if (!declaredInCurrentFunctionScope && usedSoFarInCurrentFunction(bindingName)) {
  21509. _latedefWarning(type, bindingName, token);
  21510. }
  21511. // defining with a var or a function when a block scope variable of the same name
  21512. // is in scope is an error
  21513. if (scopeManagerInst.funct.has(bindingName, { onlyBlockscoped: true })) {
  21514. warning("E011", token, bindingName);
  21515. } else if (state.option.shadow !== true) {
  21516. // now since we didn't get any block scope variables, test for var/function
  21517. // shadowing
  21518. if (declaredInCurrentFunctionScope && bindingName !== "__proto__") {
  21519. // see https://github.com/jshint/jshint/issues/2400
  21520. if (_currentFunctBody["(type)"] !== "global") {
  21521. warning("W004", token, bindingName);
  21522. }
  21523. }
  21524. }
  21525. scopeManagerInst.funct.add(bindingName, type, token, !isexported);
  21526. if (_currentFunctBody["(type)"] === "global" && !state.impliedClosure()) {
  21527. usedPredefinedAndGlobals[bindingName] = marker;
  21528. }
  21529. }
  21530. },
  21531. funct: {
  21532. /**
  21533. * Return the type of the provided binding given certain options
  21534. *
  21535. * @param {string} bindingName
  21536. * @param {Object=} [options]
  21537. * @param {boolean} [options.onlyBlockscoped] - only include block scoped
  21538. * bindings
  21539. * @param {boolean} [options.excludeParams] - exclude the param scope
  21540. * @param {boolean} [options.excludeCurrent] - exclude the current scope
  21541. *
  21542. * @returns {String}
  21543. */
  21544. bindingtype: function(bindingName, options) {
  21545. var onlyBlockscoped = options && options.onlyBlockscoped;
  21546. var excludeParams = options && options.excludeParams;
  21547. var currentScopeIndex = _scopeStack.length - (options && options.excludeCurrent ? 2 : 1);
  21548. for (var i = currentScopeIndex; i >= 0; i--) {
  21549. var current = _scopeStack[i];
  21550. if (current["(bindings)"][bindingName] &&
  21551. (!onlyBlockscoped || current["(bindings)"][bindingName]["(blockscoped)"])) {
  21552. return current["(bindings)"][bindingName]["(type)"];
  21553. }
  21554. var scopeCheck = excludeParams ? _scopeStack[ i - 1 ] : current;
  21555. if (scopeCheck && scopeCheck["(type)"] === "functionparams") {
  21556. return null;
  21557. }
  21558. }
  21559. return null;
  21560. },
  21561. /**
  21562. * Determine whether a `break` statement label exists in the function
  21563. * scope.
  21564. *
  21565. * @param {string} labelName - the value of the identifier
  21566. *
  21567. * @returns {boolean}
  21568. */
  21569. hasLabel: function(labelName) {
  21570. for (var i = _scopeStack.length - 1; i >= 0; i--) {
  21571. var current = _scopeStack[i];
  21572. if (current["(labels)"][labelName]) {
  21573. return true;
  21574. }
  21575. if (current["(type)"] === "functionparams") {
  21576. return false;
  21577. }
  21578. }
  21579. return false;
  21580. },
  21581. /**
  21582. * Determine if a given name has been defined in the current function
  21583. * scope.
  21584. *
  21585. * @param {string} bindingName - the value of the identifier
  21586. * @param {object} options - options as supported by the
  21587. * `funct.bindingtype` method
  21588. *
  21589. * @return {boolean}
  21590. */
  21591. has: function(bindingName, options) {
  21592. return Boolean(this.bindingtype(bindingName, options));
  21593. },
  21594. /**
  21595. * Create a new function-scoped binding and add it to the current scope.
  21596. * See the `block.add` method for coresponding logic to create
  21597. * block-scoped bindings.
  21598. *
  21599. * @param {string} bindingName - the value of the identifier
  21600. * @param {string} type - the type of the binding; either "function" or
  21601. * "var"
  21602. * @param {object} tok - the token that triggered the definition
  21603. * @param {boolean} unused - `true` if the binding has not been
  21604. * referenced
  21605. */
  21606. add: function(bindingName, type, tok, unused) {
  21607. _current["(bindings)"][bindingName] = {
  21608. "(type)" : type,
  21609. "(token)": tok,
  21610. "(blockscoped)": false,
  21611. "(function)": _currentFunctBody,
  21612. "(unused)": unused };
  21613. }
  21614. },
  21615. block: {
  21616. /**
  21617. * Determine whether the current block scope is the global scope.
  21618. *
  21619. * @returns Boolean
  21620. */
  21621. isGlobal: function() {
  21622. return _current["(type)"] === "global";
  21623. },
  21624. /**
  21625. * Resolve a reference to a binding and mark the corresponding binding as
  21626. * "used."
  21627. *
  21628. * @param {string} bindingName - the value of the identifier
  21629. * @param {object} token - the token value that triggered the reference
  21630. */
  21631. use: function(bindingName, token) {
  21632. // If the name resolves to a parameter of the current function, then do
  21633. // not store usage. This is because in cases such as the following:
  21634. //
  21635. // function(a) {
  21636. // var a;
  21637. // a = a;
  21638. // }
  21639. //
  21640. // the usage of `a` will resolve to the parameter, not to the unset
  21641. // variable binding.
  21642. var paramScope = _currentFunctBody["(parent)"];
  21643. if (paramScope && paramScope["(bindings)"][bindingName] &&
  21644. paramScope["(bindings)"][bindingName]["(type)"] === "param") {
  21645. // then check its not declared by a block scope variable
  21646. if (!scopeManagerInst.funct.has(bindingName,
  21647. { excludeParams: true, onlyBlockscoped: true })) {
  21648. paramScope["(bindings)"][bindingName]["(unused)"] = false;
  21649. }
  21650. }
  21651. if (token && (state.ignored.W117 || state.option.undef === false)) {
  21652. token.ignoreUndef = true;
  21653. }
  21654. _setupUsages(bindingName);
  21655. _current["(usages)"][bindingName]["(onlyUsedSubFunction)"] = false;
  21656. if (token) {
  21657. token["(function)"] = _currentFunctBody;
  21658. _current["(usages)"][bindingName]["(tokens)"].push(token);
  21659. }
  21660. // Block-scoped bindings can't be used within their initializer due to
  21661. // "temporal dead zone" (TDZ) restrictions.
  21662. var binding = _current["(bindings)"][bindingName];
  21663. if (binding && binding["(blockscoped)"] && !binding["(initialized)"]) {
  21664. error("E056", token, bindingName, binding["(type)"]);
  21665. }
  21666. },
  21667. reassign: function(bindingName, token) {
  21668. token.ignoreW020 = state.ignored.W020;
  21669. token.ignoreW021 = state.ignored.W021;
  21670. this.modify(bindingName, token);
  21671. _current["(usages)"][bindingName]["(reassigned)"].push(token);
  21672. },
  21673. modify: function(bindingName, token) {
  21674. _setupUsages(bindingName);
  21675. _current["(usages)"][bindingName]["(onlyUsedSubFunction)"] = false;
  21676. _current["(usages)"][bindingName]["(modified)"].push(token);
  21677. },
  21678. /**
  21679. * Create a new block-scoped binding and add it to the current scope. See
  21680. * the `funct.add` method for coresponding logic to create
  21681. * function-scoped bindings.
  21682. *
  21683. * @param {string} bindingName - the value of the identifier
  21684. * @param {string} type - the type of the binding; one of "class",
  21685. * "const", "function", "import", or "let"
  21686. * @param {object} tok - the token that triggered the definition
  21687. * @param {boolean} unused - `true` if the binding has not been
  21688. * referenced
  21689. * @param {boolean} initialized - `true` if the binding has been
  21690. * initialized (as is the case with
  21691. * bindings created via `import`
  21692. * declarations)
  21693. */
  21694. add: function(bindingName, type, tok, unused, initialized) {
  21695. _current["(bindings)"][bindingName] = {
  21696. "(type)" : type,
  21697. "(token)": tok,
  21698. "(initialized)": !!initialized,
  21699. "(blockscoped)": true,
  21700. "(unused)": unused };
  21701. },
  21702. addLabel: function(labelName, opts) {
  21703. var token = opts.token;
  21704. if (scopeManagerInst.funct.hasLabel(labelName)) {
  21705. warning("E011", token, labelName);
  21706. }
  21707. else if (state.option.shadow === "outer") {
  21708. if (scopeManagerInst.funct.has(labelName)) {
  21709. warning("W004", token, labelName);
  21710. } else {
  21711. _checkOuterShadow(labelName, token);
  21712. }
  21713. }
  21714. _current["(labels)"][labelName] = token;
  21715. }
  21716. }
  21717. };
  21718. return scopeManagerInst;
  21719. };
  21720. module.exports = scopeManager;
  21721. },{"events":11,"lodash":12}],24:[function(require,module,exports){
  21722. "use strict";
  21723. var NameStack = require("./name-stack.js");
  21724. var state = {
  21725. syntax: {},
  21726. /**
  21727. * Determine if the code currently being linted is strict mode code.
  21728. *
  21729. * @returns {boolean}
  21730. */
  21731. isStrict: function() {
  21732. return !!this.directive["use strict"] || this.inClassBody ||
  21733. this.option.module || this.option.strict === "implied";
  21734. },
  21735. /**
  21736. * Determine if the current state warrants a warning for statements outside
  21737. * of strict mode code.
  21738. *
  21739. * While emitting warnings based on function scope would be more intuitive
  21740. * (and less noisy), JSHint observes statement-based semantics in order to
  21741. * preserve legacy behavior.
  21742. *
  21743. * This method does not take the state of the parser into account, making no
  21744. * distinction between global code and function code. Because the "missing
  21745. * 'use strict'" warning is *also* reported at function boundaries, this
  21746. * function interprets `strict` option values `true` and `undefined` as
  21747. * equivalent.
  21748. */
  21749. stmtMissingStrict: function() {
  21750. if (this.option.strict === "global") {
  21751. return true;
  21752. }
  21753. if (this.option.strict === false) {
  21754. return false;
  21755. }
  21756. if (this.option.globalstrict) {
  21757. return true;
  21758. }
  21759. return false;
  21760. },
  21761. allowsGlobalUsd: function() {
  21762. return this.option.strict === "global" || this.option.globalstrict ||
  21763. this.option.module || this.impliedClosure();
  21764. },
  21765. /**
  21766. * Determine if the current configuration describes an environment that is
  21767. * wrapped in an immediately-invoked function expression prior to evaluation.
  21768. *
  21769. * @returns {boolean}
  21770. */
  21771. impliedClosure: function() {
  21772. return this.option.node || this.option.phantom || this.option.browserify;
  21773. },
  21774. // Assumption: chronologically ES3 < ES5 < ES6 < Moz
  21775. inMoz: function() {
  21776. return this.option.moz;
  21777. },
  21778. /**
  21779. * Determine if constructs introduced in ECMAScript 11 should be accepted.
  21780. *
  21781. * @returns {boolean}
  21782. */
  21783. inES11: function() {
  21784. return this.esVersion >= 11;
  21785. },
  21786. /**
  21787. * Determine if constructs introduced in ECMAScript 10 should be accepted.
  21788. *
  21789. * @returns {boolean}
  21790. */
  21791. inES10: function() {
  21792. return this.esVersion >= 10;
  21793. },
  21794. /**
  21795. * Determine if constructs introduced in ECMAScript 9 should be accepted.
  21796. *
  21797. * @returns {boolean}
  21798. */
  21799. inES9: function() {
  21800. return this.esVersion >= 9;
  21801. },
  21802. /**
  21803. * Determine if constructs introduced in ECMAScript 8 should be accepted.
  21804. *
  21805. * @returns {boolean}
  21806. */
  21807. inES8: function() {
  21808. return this.esVersion >= 8;
  21809. },
  21810. /**
  21811. * Determine if constructs introduced in ECMAScript 7 should be accepted.
  21812. *
  21813. * @returns {boolean}
  21814. */
  21815. inES7: function() {
  21816. return this.esVersion >= 7;
  21817. },
  21818. /**
  21819. * Determine if constructs introduced in ECMAScript 6 should be accepted.
  21820. *
  21821. * @param {boolean} strict - When `true`, do not interpret the `moz` option
  21822. * as ECMAScript 6
  21823. *
  21824. * @returns {boolean}
  21825. */
  21826. inES6: function(strict) {
  21827. if (!strict && this.option.moz) {
  21828. return true;
  21829. }
  21830. return this.esVersion >= 6;
  21831. },
  21832. /**
  21833. * Determine if constructs introduced in ECMAScript 5 should be accepted.
  21834. *
  21835. * @returns {boolean}
  21836. */
  21837. inES5: function() {
  21838. return !this.esVersion || this.esVersion >= 5 || this.option.moz;
  21839. },
  21840. /**
  21841. * Determine the current version of the input language by inspecting the
  21842. * value of all ECMAScript-version-related options. This logic is necessary
  21843. * to ensure compatibility with deprecated options `es3`, `es5`, and
  21844. * `esnext`, and it may be drastically simplified when those options are
  21845. * removed.
  21846. *
  21847. * @returns {string|null} - the name of any incompatible option detected,
  21848. * `null` otherwise
  21849. */
  21850. inferEsVersion: function() {
  21851. var badOpt = null;
  21852. if (this.option.esversion) {
  21853. if (this.option.es3) {
  21854. badOpt = "es3";
  21855. } else if (this.option.es5) {
  21856. badOpt = "es5";
  21857. } else if (this.option.esnext) {
  21858. badOpt = "esnext";
  21859. }
  21860. if (badOpt) {
  21861. return badOpt;
  21862. }
  21863. if (this.option.esversion === 2015) {
  21864. this.esVersion = 6;
  21865. } else {
  21866. this.esVersion = this.option.esversion;
  21867. }
  21868. } else if (this.option.es3) {
  21869. this.esVersion = 3;
  21870. } else if (this.option.esnext) {
  21871. this.esVersion = 6;
  21872. }
  21873. return null;
  21874. },
  21875. reset: function() {
  21876. this.tokens = {
  21877. prev: null,
  21878. next: null,
  21879. curr: null
  21880. };
  21881. this.option = { unstable: {} };
  21882. this.esVersion = 5;
  21883. this.funct = null;
  21884. this.ignored = {};
  21885. /**
  21886. * A lookup table for active directives whose keys are the value of the
  21887. * directives and whose values are the tokens which enabled the directives.
  21888. */
  21889. this.directive = Object.create(null);
  21890. this.jsonMode = false;
  21891. this.lines = [];
  21892. this.tab = "";
  21893. this.cache = {}; // Node.JS doesn't have Map. Sniff.
  21894. this.ignoredLines = {};
  21895. this.forinifcheckneeded = false;
  21896. this.nameStack = new NameStack();
  21897. this.inClassBody = false;
  21898. }
  21899. };
  21900. exports.state = state;
  21901. },{"./name-stack.js":19}],25:[function(require,module,exports){
  21902. "use strict";
  21903. exports.register = function(linter) {
  21904. // Check for properties named __proto__. This special property was
  21905. // deprecated and then re-introduced for ES6.
  21906. linter.on("Identifier", function style_scanProto(data) {
  21907. if (linter.getOption("proto")) {
  21908. return;
  21909. }
  21910. if (data.name === "__proto__") {
  21911. linter.warn("W103", {
  21912. line: data.line,
  21913. char: data.char,
  21914. data: [ data.name, "6" ]
  21915. });
  21916. }
  21917. });
  21918. // Check for properties named __iterator__. This is a special property
  21919. // available only in browsers with JavaScript 1.7 implementation, but
  21920. // it is deprecated for ES6
  21921. linter.on("Identifier", function style_scanIterator(data) {
  21922. if (linter.getOption("iterator")) {
  21923. return;
  21924. }
  21925. if (data.name === "__iterator__") {
  21926. linter.warn("W103", {
  21927. line: data.line,
  21928. char: data.char,
  21929. data: [ data.name ]
  21930. });
  21931. }
  21932. });
  21933. // Check that all identifiers are using camelCase notation.
  21934. // Exceptions: names like MY_VAR and _myVar.
  21935. linter.on("Identifier", function style_scanCamelCase(data) {
  21936. if (!linter.getOption("camelcase")) {
  21937. return;
  21938. }
  21939. if (data.name.replace(/^_+|_+$/g, "").indexOf("_") > -1 && !data.name.match(/^[A-Z0-9_]*$/)) {
  21940. linter.warn("W106", {
  21941. line: data.line,
  21942. char: data.char,
  21943. data: [ data.name ]
  21944. });
  21945. }
  21946. });
  21947. // Enforce consistency in style of quoting.
  21948. linter.on("String", function style_scanQuotes(data) {
  21949. var quotmark = linter.getOption("quotmark");
  21950. var code;
  21951. if (!quotmark) {
  21952. return;
  21953. }
  21954. // If quotmark is set to 'single' warn about all double-quotes.
  21955. if (quotmark === "single" && data.quote !== "'") {
  21956. code = "W109";
  21957. }
  21958. // If quotmark is set to 'double' warn about all single-quotes.
  21959. if (quotmark === "double" && data.quote !== "\"") {
  21960. code = "W108";
  21961. }
  21962. // If quotmark is set to true, remember the first quotation style
  21963. // and then warn about all others.
  21964. if (quotmark === true) {
  21965. if (!linter.getCache("quotmark")) {
  21966. linter.setCache("quotmark", data.quote);
  21967. }
  21968. if (linter.getCache("quotmark") !== data.quote) {
  21969. code = "W110";
  21970. }
  21971. }
  21972. if (code) {
  21973. linter.warn(code, {
  21974. line: data.line,
  21975. char: data.char,
  21976. });
  21977. }
  21978. });
  21979. linter.on("Number", function style_scanNumbers(data) {
  21980. if (data.value.charAt(0) === ".") {
  21981. // Warn about a leading decimal point.
  21982. linter.warn("W008", {
  21983. line: data.line,
  21984. char: data.char,
  21985. data: [ data.value ]
  21986. });
  21987. }
  21988. if (data.value.substr(data.value.length - 1) === ".") {
  21989. // Warn about a trailing decimal point.
  21990. linter.warn("W047", {
  21991. line: data.line,
  21992. char: data.char,
  21993. data: [ data.value ]
  21994. });
  21995. }
  21996. if (/^00+/.test(data.value)) {
  21997. // Multiple leading zeroes.
  21998. linter.warn("W046", {
  21999. line: data.line,
  22000. char: data.char,
  22001. data: [ data.value ]
  22002. });
  22003. }
  22004. });
  22005. // Warn about script URLs.
  22006. linter.on("String", function style_scanJavaScriptURLs(data) {
  22007. var re = /^(?:javascript|jscript|ecmascript|vbscript|livescript)\s*:/i;
  22008. if (linter.getOption("scripturl")) {
  22009. return;
  22010. }
  22011. if (re.test(data.value)) {
  22012. linter.warn("W107", {
  22013. line: data.line,
  22014. char: data.char
  22015. });
  22016. }
  22017. });
  22018. };
  22019. },{}],26:[function(require,module,exports){
  22020. /*
  22021. * Determine whether a given string is a valid UnicodePropertyValueExpression.
  22022. */
  22023. "use strict";
  22024. module.exports = function validate(sequence) {
  22025. var equalSignIndex = sequence.indexOf("=");
  22026. if (equalSignIndex === -1) {
  22027. return sequence in names.binary || sequence in values.general;
  22028. }
  22029. var name = sequence.substr(0, equalSignIndex);
  22030. var value = sequence.substr(equalSignIndex + 1);
  22031. if (name === "General_Category" || name === "gc") {
  22032. return value in values.general;
  22033. } if (name === "Script" || name === "sc" || name === "Script_Extensions" || name === "scx") {
  22034. return value in values.script;
  22035. }
  22036. return false;
  22037. };
  22038. var names = {
  22039. nonBinary: Object.create(null),
  22040. binary: Object.create(null)
  22041. };
  22042. var values = {
  22043. general: Object.create(null),
  22044. script: Object.create(null)
  22045. };
  22046. var nb = names.nonBinary;
  22047. nb.General_Category = true;
  22048. nb.gc = true;
  22049. nb.Script = true;
  22050. nb.sc = true;
  22051. nb.Script_Extensions = true;
  22052. nb.scx = true;
  22053. var b = names.binary;
  22054. b.ASCII = true;
  22055. b.ASCII_Hex_Digit = true;
  22056. b.AHex = true;
  22057. b.Alphabetic = true;
  22058. b.Alpha = true;
  22059. b.Any = true;
  22060. b.Assigned = true;
  22061. b.Bidi_Control = true;
  22062. b.Bidi_C = true;
  22063. b.Bidi_Mirrored = true;
  22064. b.Bidi_M = true;
  22065. b.Case_Ignorable = true;
  22066. b.CI = true;
  22067. b.Cased = true;
  22068. b.Changes_When_Casefolded = true;
  22069. b.CWCF = true;
  22070. b.Changes_When_Casemapped = true;
  22071. b.CWCM = true;
  22072. b.Changes_When_Lowercased = true;
  22073. b.CWL = true;
  22074. b.Changes_When_NFKC_Casefolded = true;
  22075. b.CWKCF = true;
  22076. b.Changes_When_Titlecased = true;
  22077. b.CWT = true;
  22078. b.Changes_When_Uppercased = true;
  22079. b.CWU = true;
  22080. b.Dash = true;
  22081. b.Default_Ignorable_Code_Point = true;
  22082. b.DI = true;
  22083. b.Deprecated = true;
  22084. b.Dep = true;
  22085. b.Diacritic = true;
  22086. b.Dia = true;
  22087. b.Emoji = true;
  22088. b.Emoji_Component = true;
  22089. b.EComp = true;
  22090. b.Emoji_Modifier = true;
  22091. b.EMod = true;
  22092. b.Emoji_Modifier_Base = true;
  22093. b.EBase = true;
  22094. b.Emoji_Presentation = true;
  22095. b.EPres = true;
  22096. b.Extended_Pictographic = true;
  22097. b.ExtPict = true;
  22098. b.Extender = true;
  22099. b.Ext = true;
  22100. b.Grapheme_Base = true;
  22101. b.Gr_Base = true;
  22102. b.Grapheme_Extend = true;
  22103. b.Gr_Ext = true;
  22104. b.Hex_Digit = true;
  22105. b.Hex = true;
  22106. b.IDS_Binary_Operator = true;
  22107. b.IDSB = true;
  22108. b.IDS_Trinary_Operator = true;
  22109. b.IDST = true;
  22110. b.ID_Continue = true;
  22111. b.IDC = true;
  22112. b.ID_Start = true;
  22113. b.IDS = true;
  22114. b.Ideographic = true;
  22115. b.Ideo = true;
  22116. b.Join_Control = true;
  22117. b.Join_C = true;
  22118. b.Logical_Order_Exception = true;
  22119. b.LOE = true;
  22120. b.Lowercase = true;
  22121. b.Lower = true;
  22122. b.Math = true;
  22123. b.Noncharacter_Code_Point = true;
  22124. b.NChar = true;
  22125. b.Pattern_Syntax = true;
  22126. b.Pat_Syn = true;
  22127. b.Pattern_White_Space = true;
  22128. b.Pat_WS = true;
  22129. b.Quotation_Mark = true;
  22130. b.QMark = true;
  22131. b.Radical = true;
  22132. b.Regional_Indicator = true;
  22133. b.RI = true;
  22134. b.Sentence_Terminal = true;
  22135. b.STerm = true;
  22136. b.Soft_Dotted = true;
  22137. b.SD = true;
  22138. b.Terminal_Punctuation = true;
  22139. b.Term = true;
  22140. b.Unified_Ideograph = true;
  22141. b.UIdeo = true;
  22142. b.Uppercase = true;
  22143. b.Upper = true;
  22144. b.Variation_Selector = true;
  22145. b.VS = true;
  22146. b.White_Space = true;
  22147. b.space = true;
  22148. b.XID_Continue = true;
  22149. b.XIDC = true;
  22150. b.XID_Start = true;
  22151. b.XIDS = true;
  22152. var g = values.general;
  22153. g.Cased_Letter = true;
  22154. g.LC = true;
  22155. g.Close_Punctuation = true;
  22156. g.Pe = true;
  22157. g.Connector_Punctuation = true;
  22158. g.Pc = true;
  22159. g.Control = true;
  22160. g.Cc = true;
  22161. g.cntrl = true;
  22162. g.Currency_Symbol = true;
  22163. g.Sc = true;
  22164. g.Dash_Punctuation = true;
  22165. g.Pd = true;
  22166. g.Decimal_Number = true;
  22167. g.Nd = true;
  22168. g.digit = true;
  22169. g.Enclosing_Mark = true;
  22170. g.Me = true;
  22171. g.Final_Punctuation = true;
  22172. g.Pf = true;
  22173. g.Format = true;
  22174. g.Cf = true;
  22175. g.Initial_Punctuation = true;
  22176. g.Pi = true;
  22177. g.Letter = true;
  22178. g.L = true;
  22179. g.Letter_Number = true;
  22180. g.Nl = true;
  22181. g.Line_Separator = true;
  22182. g.Zl = true;
  22183. g.Lowercase_Letter = true;
  22184. g.Ll = true;
  22185. g.Mark = true;
  22186. g.M = true;
  22187. g.Combining_Mark = true;
  22188. g.Math_Symbol = true;
  22189. g.Sm = true;
  22190. g.Modifier_Letter = true;
  22191. g.Lm = true;
  22192. g.Modifier_Symbol = true;
  22193. g.Sk = true;
  22194. g.Nonspacing_Mark = true;
  22195. g.Mn = true;
  22196. g.Number = true;
  22197. g.N = true;
  22198. g.Open_Punctuation = true;
  22199. g.Ps = true;
  22200. g.Other = true;
  22201. g.C = true;
  22202. g.Other_Letter = true;
  22203. g.Lo = true;
  22204. g.Other_Number = true;
  22205. g.No = true;
  22206. g.Other_Punctuation = true;
  22207. g.Po = true;
  22208. g.Other_Symbol = true;
  22209. g.So = true;
  22210. g.Paragraph_Separator = true;
  22211. g.Zp = true;
  22212. g.Private_Use = true;
  22213. g.Co = true;
  22214. g.Punctuation = true;
  22215. g.P = true;
  22216. g.punct = true;
  22217. g.Separator = true;
  22218. g.Z = true;
  22219. g.Space_Separator = true;
  22220. g.Zs = true;
  22221. g.Spacing_Mark = true;
  22222. g.Mc = true;
  22223. g.Surrogate = true;
  22224. g.Cs = true;
  22225. g.Symbol = true;
  22226. g.S = true;
  22227. g.Titlecase_Letter = true;
  22228. g.Lt = true;
  22229. g.Unassigned = true;
  22230. g.Cn = true;
  22231. g.Uppercase_Letter = true;
  22232. g.Lu = true;
  22233. var s = values.script;
  22234. s.Adlam = true;
  22235. s.Adlm = true;
  22236. s.Ahom = true;
  22237. s.Anatolian_Hieroglyphs = true;
  22238. s.Hluw = true;
  22239. s.Arabic = true;
  22240. s.Arab = true;
  22241. s.Armenian = true;
  22242. s.Armn = true;
  22243. s.Avestan = true;
  22244. s.Avst = true;
  22245. s.Balinese = true;
  22246. s.Bali = true;
  22247. s.Bamum = true;
  22248. s.Bamu = true;
  22249. s.Bassa_Vah = true;
  22250. s.Bass = true;
  22251. s.Batak = true;
  22252. s.Batk = true;
  22253. s.Bengali = true;
  22254. s.Beng = true;
  22255. s.Bhaiksuki = true;
  22256. s.Bhks = true;
  22257. s.Bopomofo = true;
  22258. s.Bopo = true;
  22259. s.Brahmi = true;
  22260. s.Brah = true;
  22261. s.Braille = true;
  22262. s.Brai = true;
  22263. s.Buginese = true;
  22264. s.Bugi = true;
  22265. s.Buhid = true;
  22266. s.Buhd = true;
  22267. s.Canadian_Aboriginal = true;
  22268. s.Cans = true;
  22269. s.Carian = true;
  22270. s.Cari = true;
  22271. s.Caucasian_Albanian = true;
  22272. s.Aghb = true;
  22273. s.Chakma = true;
  22274. s.Cakm = true;
  22275. s.Cham = true;
  22276. s.Chorasmian = true;
  22277. s.Chrs = true;
  22278. s.Cherokee = true;
  22279. s.Cher = true;
  22280. s.Common = true;
  22281. s.Zyyy = true;
  22282. s.Coptic = true;
  22283. s.Copt = true;
  22284. s.Qaac = true;
  22285. s.Cuneiform = true;
  22286. s.Xsux = true;
  22287. s.Cypriot = true;
  22288. s.Cprt = true;
  22289. s.Cyrillic = true;
  22290. s.Cyrl = true;
  22291. s.Deseret = true;
  22292. s.Dsrt = true;
  22293. s.Devanagari = true;
  22294. s.Deva = true;
  22295. s.Dives_Akuru = true;
  22296. s.Diak = true;
  22297. s.Dogra = true;
  22298. s.Dogr = true;
  22299. s.Duployan = true;
  22300. s.Dupl = true;
  22301. s.Egyptian_Hieroglyphs = true;
  22302. s.Egyp = true;
  22303. s.Elbasan = true;
  22304. s.Elba = true;
  22305. s.Elymaic = true;
  22306. s.Elym = true;
  22307. s.Ethiopic = true;
  22308. s.Ethi = true;
  22309. s.Georgian = true;
  22310. s.Geor = true;
  22311. s.Glagolitic = true;
  22312. s.Glag = true;
  22313. s.Gothic = true;
  22314. s.Goth = true;
  22315. s.Grantha = true;
  22316. s.Gran = true;
  22317. s.Greek = true;
  22318. s.Grek = true;
  22319. s.Gujarati = true;
  22320. s.Gujr = true;
  22321. s.Gunjala_Gondi = true;
  22322. s.Gong = true;
  22323. s.Gurmukhi = true;
  22324. s.Guru = true;
  22325. s.Han = true;
  22326. s.Hani = true;
  22327. s.Hangul = true;
  22328. s.Hang = true;
  22329. s.Hanifi_Rohingya = true;
  22330. s.Rohg = true;
  22331. s.Hanunoo = true;
  22332. s.Hano = true;
  22333. s.Hatran = true;
  22334. s.Hatr = true;
  22335. s.Hebrew = true;
  22336. s.Hebr = true;
  22337. s.Hiragana = true;
  22338. s.Hira = true;
  22339. s.Imperial_Aramaic = true;
  22340. s.Armi = true;
  22341. s.Inherited = true;
  22342. s.Zinh = true;
  22343. s.Qaai = true;
  22344. s.Inscriptional_Pahlavi = true;
  22345. s.Phli = true;
  22346. s.Inscriptional_Parthian = true;
  22347. s.Prti = true;
  22348. s.Javanese = true;
  22349. s.Java = true;
  22350. s.Kaithi = true;
  22351. s.Kthi = true;
  22352. s.Kannada = true;
  22353. s.Knda = true;
  22354. s.Katakana = true;
  22355. s.Kana = true;
  22356. s.Kayah_Li = true;
  22357. s.Kali = true;
  22358. s.Kharoshthi = true;
  22359. s.Khar = true;
  22360. s.Khitan_Small_Script = true;
  22361. s.Kits = true;
  22362. s.Khmer = true;
  22363. s.Khmr = true;
  22364. s.Khojki = true;
  22365. s.Khoj = true;
  22366. s.Khudawadi = true;
  22367. s.Sind = true;
  22368. s.Lao = true;
  22369. s.Laoo = true;
  22370. s.Latin = true;
  22371. s.Latn = true;
  22372. s.Lepcha = true;
  22373. s.Lepc = true;
  22374. s.Limbu = true;
  22375. s.Limb = true;
  22376. s.Linear_A = true;
  22377. s.Lina = true;
  22378. s.Linear_B = true;
  22379. s.Linb = true;
  22380. s.Lisu = true;
  22381. s.Lycian = true;
  22382. s.Lyci = true;
  22383. s.Lydian = true;
  22384. s.Lydi = true;
  22385. s.Mahajani = true;
  22386. s.Mahj = true;
  22387. s.Makasar = true;
  22388. s.Maka = true;
  22389. s.Malayalam = true;
  22390. s.Mlym = true;
  22391. s.Mandaic = true;
  22392. s.Mand = true;
  22393. s.Manichaean = true;
  22394. s.Mani = true;
  22395. s.Marchen = true;
  22396. s.Marc = true;
  22397. s.Medefaidrin = true;
  22398. s.Medf = true;
  22399. s.Masaram_Gondi = true;
  22400. s.Gonm = true;
  22401. s.Meetei_Mayek = true;
  22402. s.Mtei = true;
  22403. s.Mende_Kikakui = true;
  22404. s.Mend = true;
  22405. s.Meroitic_Cursive = true;
  22406. s.Merc = true;
  22407. s.Meroitic_Hieroglyphs = true;
  22408. s.Mero = true;
  22409. s.Miao = true;
  22410. s.Plrd = true;
  22411. s.Modi = true;
  22412. s.Mongolian = true;
  22413. s.Mong = true;
  22414. s.Mro = true;
  22415. s.Mroo = true;
  22416. s.Multani = true;
  22417. s.Mult = true;
  22418. s.Myanmar = true;
  22419. s.Mymr = true;
  22420. s.Nabataean = true;
  22421. s.Nbat = true;
  22422. s.Nandinagari = true;
  22423. s.Nand = true;
  22424. s.New_Tai_Lue = true;
  22425. s.Talu = true;
  22426. s.Newa = true;
  22427. s.Nko = true;
  22428. s.Nkoo = true;
  22429. s.Nushu = true;
  22430. s.Nshu = true;
  22431. s.Nyiakeng_Puachue_Hmong = true;
  22432. s.Hmnp = true;
  22433. s.Ogham = true;
  22434. s.Ogam = true;
  22435. s.Ol_Chiki = true;
  22436. s.Olck = true;
  22437. s.Old_Hungarian = true;
  22438. s.Hung = true;
  22439. s.Old_Italic = true;
  22440. s.Ital = true;
  22441. s.Old_North_Arabian = true;
  22442. s.Narb = true;
  22443. s.Old_Permic = true;
  22444. s.Perm = true;
  22445. s.Old_Persian = true;
  22446. s.Xpeo = true;
  22447. s.Old_Sogdian = true;
  22448. s.Sogo = true;
  22449. s.Old_South_Arabian = true;
  22450. s.Sarb = true;
  22451. s.Old_Turkic = true;
  22452. s.Orkh = true;
  22453. s.Oriya = true;
  22454. s.Orya = true;
  22455. s.Osage = true;
  22456. s.Osge = true;
  22457. s.Osmanya = true;
  22458. s.Osma = true;
  22459. s.Pahawh_Hmong = true;
  22460. s.Hmng = true;
  22461. s.Palmyrene = true;
  22462. s.Palm = true;
  22463. s.Pau_Cin_Hau = true;
  22464. s.Pauc = true;
  22465. s.Phags_Pa = true;
  22466. s.Phag = true;
  22467. s.Phoenician = true;
  22468. s.Phnx = true;
  22469. s.Psalter_Pahlavi = true;
  22470. s.Phlp = true;
  22471. s.Rejang = true;
  22472. s.Rjng = true;
  22473. s.Runic = true;
  22474. s.Runr = true;
  22475. s.Samaritan = true;
  22476. s.Samr = true;
  22477. s.Saurashtra = true;
  22478. s.Saur = true;
  22479. s.Sharada = true;
  22480. s.Shrd = true;
  22481. s.Shavian = true;
  22482. s.Shaw = true;
  22483. s.Siddham = true;
  22484. s.Sidd = true;
  22485. s.SignWriting = true;
  22486. s.Sgnw = true;
  22487. s.Sinhala = true;
  22488. s.Sinh = true;
  22489. s.Sogdian = true;
  22490. s.Sogd = true;
  22491. s.Sora_Sompeng = true;
  22492. s.Sora = true;
  22493. s.Soyombo = true;
  22494. s.Soyo = true;
  22495. s.Sundanese = true;
  22496. s.Sund = true;
  22497. s.Syloti_Nagri = true;
  22498. s.Sylo = true;
  22499. s.Syriac = true;
  22500. s.Syrc = true;
  22501. s.Tagalog = true;
  22502. s.Tglg = true;
  22503. s.Tagbanwa = true;
  22504. s.Tagb = true;
  22505. s.Tai_Le = true;
  22506. s.Tale = true;
  22507. s.Tai_Tham = true;
  22508. s.Lana = true;
  22509. s.Tai_Viet = true;
  22510. s.Tavt = true;
  22511. s.Takri = true;
  22512. s.Takr = true;
  22513. s.Tamil = true;
  22514. s.Taml = true;
  22515. s.Tangut = true;
  22516. s.Tang = true;
  22517. s.Telugu = true;
  22518. s.Telu = true;
  22519. s.Thaana = true;
  22520. s.Thaa = true;
  22521. s.Thai = true;
  22522. s.Tibetan = true;
  22523. s.Tibt = true;
  22524. s.Tifinagh = true;
  22525. s.Tfng = true;
  22526. s.Tirhuta = true;
  22527. s.Tirh = true;
  22528. s.Ugaritic = true;
  22529. s.Ugar = true;
  22530. s.Vai = true;
  22531. s.Vaii = true;
  22532. s.Wancho = true;
  22533. s.Wcho = true;
  22534. s.Warang_Citi = true;
  22535. s.Wara = true;
  22536. s.Yezidi = true;
  22537. s.Yezi = true;
  22538. s.Yi = true;
  22539. s.Yiii = true;
  22540. s.Zanabazar_Square = true;
  22541. s.Zanb = true;
  22542. },{}],27:[function(require,module,exports){
  22543. // jshint -W001
  22544. "use strict";
  22545. // Identifiers provided by the ECMAScript standard.
  22546. exports.reservedVars = {
  22547. NaN : false,
  22548. undefined : false
  22549. };
  22550. exports.ecmaIdentifiers = {
  22551. 3: {
  22552. Array : false,
  22553. Boolean : false,
  22554. Date : false,
  22555. decodeURI : false,
  22556. decodeURIComponent : false,
  22557. encodeURI : false,
  22558. encodeURIComponent : false,
  22559. Error : false,
  22560. "eval" : false,
  22561. EvalError : false,
  22562. Function : false,
  22563. hasOwnProperty : false,
  22564. Infinity : false,
  22565. isFinite : false,
  22566. isNaN : false,
  22567. Math : false,
  22568. Number : false,
  22569. Object : false,
  22570. parseInt : false,
  22571. parseFloat : false,
  22572. RangeError : false,
  22573. ReferenceError : false,
  22574. RegExp : false,
  22575. String : false,
  22576. SyntaxError : false,
  22577. TypeError : false,
  22578. URIError : false
  22579. },
  22580. 5: {
  22581. JSON : false
  22582. },
  22583. 6: {
  22584. ArrayBuffer : false,
  22585. DataView : false,
  22586. Float32Array : false,
  22587. Float64Array : false,
  22588. Int8Array : false,
  22589. Int16Array : false,
  22590. Int32Array : false,
  22591. Map : false,
  22592. Promise : false,
  22593. Proxy : false,
  22594. Reflect : false,
  22595. Set : false,
  22596. Symbol : false,
  22597. Uint8Array : false,
  22598. Uint16Array : false,
  22599. Uint32Array : false,
  22600. Uint8ClampedArray : false,
  22601. WeakMap : false,
  22602. WeakSet : false
  22603. },
  22604. 8: {
  22605. Atomics : false,
  22606. SharedArrayBuffer : false
  22607. },
  22608. 11: {
  22609. BigInt : false
  22610. }
  22611. };
  22612. // Global variables commonly provided by a web browser environment.
  22613. exports.browser = {
  22614. Audio : false,
  22615. Blob : false,
  22616. addEventListener : false, // EventTarget
  22617. applicationCache : false,
  22618. atob : false, // WindowOrWorkerGlobalScope
  22619. blur : false,
  22620. btoa : false, // WindowOrWorkerGlobalScope
  22621. cancelAnimationFrame : false,
  22622. CanvasGradient : false,
  22623. CanvasPattern : false,
  22624. CanvasRenderingContext2D: false,
  22625. CSS : false,
  22626. CSSImportRule : false,
  22627. CSSGroupingRule : false,
  22628. CSSMarginRule : false,
  22629. CSSMediaRule : false,
  22630. CSSNamespaceRule : false,
  22631. CSSPageRule : false,
  22632. CSSRule : false,
  22633. CSSRuleList : false,
  22634. CSSStyleDeclaration : false,
  22635. CSSStyleRule : false,
  22636. CSSStyleSheet : false,
  22637. clearInterval : false, // WindowOrWorkerGlobalScope
  22638. clearTimeout : false, // WindowOrWorkerGlobalScope
  22639. close : false,
  22640. closed : false,
  22641. Comment : false,
  22642. CompositionEvent : false,
  22643. createImageBitmap : false, // WindowOrWorkerGlobalScope
  22644. CustomEvent : false,
  22645. DOMParser : false,
  22646. defaultStatus : false,
  22647. dispatchEvent : false, // EventTarget
  22648. Document : false,
  22649. document : false,
  22650. DocumentFragment : false,
  22651. Element : false,
  22652. ElementTimeControl : false,
  22653. Event : false,
  22654. event : false,
  22655. fetch : false,
  22656. File : false,
  22657. FileList : false,
  22658. FileReader : false,
  22659. FormData : false,
  22660. focus : false,
  22661. frames : false,
  22662. getComputedStyle : false,
  22663. Headers : false,
  22664. HTMLAnchorElement : false,
  22665. HTMLAreaElement : false,
  22666. HTMLAudioElement : false,
  22667. HTMLBaseElement : false,
  22668. HTMLBlockquoteElement: false,
  22669. HTMLBodyElement : false,
  22670. HTMLBRElement : false,
  22671. HTMLButtonElement : false,
  22672. HTMLCanvasElement : false,
  22673. HTMLCollection : false,
  22674. HTMLDataElement : false,
  22675. HTMLDataListElement : false,
  22676. HTMLDetailsElement : false,
  22677. HTMLDialogElement : false,
  22678. HTMLDirectoryElement : false,
  22679. HTMLDivElement : false,
  22680. HTMLDListElement : false,
  22681. HTMLElement : false,
  22682. HTMLEmbedElement : false,
  22683. HTMLFieldSetElement : false,
  22684. HTMLFontElement : false,
  22685. HTMLFormElement : false,
  22686. HTMLFrameElement : false,
  22687. HTMLFrameSetElement : false,
  22688. HTMLHeadElement : false,
  22689. HTMLHeadingElement : false,
  22690. HTMLHRElement : false,
  22691. HTMLHtmlElement : false,
  22692. HTMLIFrameElement : false,
  22693. HTMLImageElement : false,
  22694. HTMLInputElement : false,
  22695. /* HTMLIsIndexElement was removed from the WHATWG HTML spec;
  22696. see https://github.com/whatwg/html/pull/1095.
  22697. HTMLIsIndexElement has been removed from browsers; see:
  22698. • Chromium Removal: https://codereview.chromium.org/96653004/
  22699. • Gecko Removal: https://bugzilla.mozilla.org/show_bug.cgi?id=1266495
  22700. • WebKit Removal: https://bugs.webkit.org/show_bug.cgi?id=7139.
  22701. See also the discussion at https://github.com/jshint/jshint/pull/3222. */
  22702. HTMLIsIndexElement : false,
  22703. HTMLLabelElement : false,
  22704. HTMLLayerElement : false,
  22705. HTMLLegendElement : false,
  22706. HTMLLIElement : false,
  22707. HTMLLinkElement : false,
  22708. HTMLMapElement : false,
  22709. HTMLMarqueeElement : false,
  22710. HTMLMediaElement : false,
  22711. HTMLMenuElement : false,
  22712. HTMLMetaElement : false,
  22713. HTMLMeterElement : false,
  22714. HTMLModElement : false,
  22715. HTMLObjectElement : false,
  22716. HTMLOListElement : false,
  22717. HTMLOptGroupElement : false,
  22718. HTMLOptionElement : false,
  22719. HTMLParagraphElement : false,
  22720. HTMLParamElement : false,
  22721. HTMLPictureElement : false,
  22722. HTMLPreElement : false,
  22723. HTMLProgressElement : false,
  22724. HTMLQuoteElement : false,
  22725. HTMLScriptElement : false,
  22726. HTMLSelectElement : false,
  22727. HTMLSlotElement : false,
  22728. HTMLSourceElement : false,
  22729. HTMLStyleElement : false,
  22730. HTMLTableCaptionElement: false,
  22731. HTMLTableCellElement : false,
  22732. HTMLTableColElement : false,
  22733. HTMLTableElement : false,
  22734. HTMLTableRowElement : false,
  22735. HTMLTableSectionElement: false,
  22736. HTMLTemplateElement : false,
  22737. HTMLTextAreaElement : false,
  22738. HTMLTimeElement : false,
  22739. HTMLTitleElement : false,
  22740. HTMLTrackElement : false,
  22741. HTMLUListElement : false,
  22742. HTMLVideoElement : false,
  22743. history : false,
  22744. Image : false,
  22745. IntersectionObserver : false,
  22746. Intl : false,
  22747. length : false,
  22748. localStorage : false,
  22749. location : false,
  22750. matchMedia : false,
  22751. MediaList : false,
  22752. MediaRecorder : false,
  22753. MessageChannel : false,
  22754. MessageEvent : false,
  22755. MessagePort : false,
  22756. MouseEvent : false,
  22757. moveBy : false,
  22758. moveTo : false,
  22759. MutationObserver : false,
  22760. name : false,
  22761. Node : false,
  22762. NodeFilter : false,
  22763. NodeList : false,
  22764. Notification : false,
  22765. navigator : false,
  22766. onbeforeunload : true,
  22767. onblur : true,
  22768. onerror : true,
  22769. onfocus : true,
  22770. onload : true,
  22771. onresize : true,
  22772. onunload : true,
  22773. open : false,
  22774. openDatabase : false,
  22775. opener : false,
  22776. Option : false,
  22777. origin : false, // WindowOrWorkerGlobalScope
  22778. parent : false,
  22779. performance : false,
  22780. print : false,
  22781. queueMicrotask : false, // WindowOrWorkerGlobalScope
  22782. Range : false,
  22783. requestAnimationFrame : false,
  22784. removeEventListener : false, // EventTarget
  22785. Request : false,
  22786. resizeBy : false,
  22787. resizeTo : false,
  22788. Response : false,
  22789. screen : false,
  22790. scroll : false,
  22791. scrollBy : false,
  22792. scrollTo : false,
  22793. sessionStorage : false,
  22794. setInterval : false, // WindowOrWorkerGlobalScope
  22795. setTimeout : false, // WindowOrWorkerGlobalScope
  22796. SharedWorker : false,
  22797. status : false,
  22798. Storage : false,
  22799. StyleSheet : false,
  22800. SVGAElement : false,
  22801. SVGAltGlyphDefElement: false,
  22802. SVGAltGlyphElement : false,
  22803. SVGAltGlyphItemElement: false,
  22804. SVGAngle : false,
  22805. SVGAnimateColorElement: false,
  22806. SVGAnimateElement : false,
  22807. SVGAnimateMotionElement: false,
  22808. SVGAnimateTransformElement: false,
  22809. SVGAnimatedAngle : false,
  22810. SVGAnimatedBoolean : false,
  22811. SVGAnimatedEnumeration: false,
  22812. SVGAnimatedInteger : false,
  22813. SVGAnimatedLength : false,
  22814. SVGAnimatedLengthList: false,
  22815. SVGAnimatedNumber : false,
  22816. SVGAnimatedNumberList: false,
  22817. SVGAnimatedPathData : false,
  22818. SVGAnimatedPoints : false,
  22819. SVGAnimatedPreserveAspectRatio: false,
  22820. SVGAnimatedRect : false,
  22821. SVGAnimatedString : false,
  22822. SVGAnimatedTransformList: false,
  22823. SVGAnimationElement : false,
  22824. SVGCSSRule : false,
  22825. SVGCircleElement : false,
  22826. SVGClipPathElement : false,
  22827. SVGColor : false,
  22828. SVGColorProfileElement: false,
  22829. SVGColorProfileRule : false,
  22830. SVGComponentTransferFunctionElement: false,
  22831. SVGCursorElement : false,
  22832. SVGDefsElement : false,
  22833. SVGDescElement : false,
  22834. SVGDocument : false,
  22835. SVGElement : false,
  22836. SVGElementInstance : false,
  22837. SVGElementInstanceList: false,
  22838. SVGEllipseElement : false,
  22839. SVGExternalResourcesRequired: false,
  22840. SVGFEBlendElement : false,
  22841. SVGFEColorMatrixElement: false,
  22842. SVGFEComponentTransferElement: false,
  22843. SVGFECompositeElement: false,
  22844. SVGFEConvolveMatrixElement: false,
  22845. SVGFEDiffuseLightingElement: false,
  22846. SVGFEDisplacementMapElement: false,
  22847. SVGFEDistantLightElement: false,
  22848. SVGFEFloodElement : false,
  22849. SVGFEFuncAElement : false,
  22850. SVGFEFuncBElement : false,
  22851. SVGFEFuncGElement : false,
  22852. SVGFEFuncRElement : false,
  22853. SVGFEGaussianBlurElement: false,
  22854. SVGFEImageElement : false,
  22855. SVGFEMergeElement : false,
  22856. SVGFEMergeNodeElement: false,
  22857. SVGFEMorphologyElement: false,
  22858. SVGFEOffsetElement : false,
  22859. SVGFEPointLightElement: false,
  22860. SVGFESpecularLightingElement: false,
  22861. SVGFESpotLightElement: false,
  22862. SVGFETileElement : false,
  22863. SVGFETurbulenceElement: false,
  22864. SVGFilterElement : false,
  22865. SVGFilterPrimitiveStandardAttributes: false,
  22866. SVGFitToViewBox : false,
  22867. SVGFontElement : false,
  22868. SVGFontFaceElement : false,
  22869. SVGFontFaceFormatElement: false,
  22870. SVGFontFaceNameElement: false,
  22871. SVGFontFaceSrcElement: false,
  22872. SVGFontFaceUriElement: false,
  22873. SVGForeignObjectElement: false,
  22874. SVGGElement : false,
  22875. SVGGlyphElement : false,
  22876. SVGGlyphRefElement : false,
  22877. SVGGradientElement : false,
  22878. SVGHKernElement : false,
  22879. SVGICCColor : false,
  22880. SVGImageElement : false,
  22881. SVGLangSpace : false,
  22882. SVGLength : false,
  22883. SVGLengthList : false,
  22884. SVGLineElement : false,
  22885. SVGLinearGradientElement: false,
  22886. SVGLocatable : false,
  22887. SVGMPathElement : false,
  22888. SVGMarkerElement : false,
  22889. SVGMaskElement : false,
  22890. SVGMatrix : false,
  22891. SVGMetadataElement : false,
  22892. SVGMissingGlyphElement: false,
  22893. SVGNumber : false,
  22894. SVGNumberList : false,
  22895. SVGPaint : false,
  22896. SVGPathElement : false,
  22897. SVGPathSeg : false,
  22898. SVGPathSegArcAbs : false,
  22899. SVGPathSegArcRel : false,
  22900. SVGPathSegClosePath : false,
  22901. SVGPathSegCurvetoCubicAbs: false,
  22902. SVGPathSegCurvetoCubicRel: false,
  22903. SVGPathSegCurvetoCubicSmoothAbs: false,
  22904. SVGPathSegCurvetoCubicSmoothRel: false,
  22905. SVGPathSegCurvetoQuadraticAbs: false,
  22906. SVGPathSegCurvetoQuadraticRel: false,
  22907. SVGPathSegCurvetoQuadraticSmoothAbs: false,
  22908. SVGPathSegCurvetoQuadraticSmoothRel: false,
  22909. SVGPathSegLinetoAbs : false,
  22910. SVGPathSegLinetoHorizontalAbs: false,
  22911. SVGPathSegLinetoHorizontalRel: false,
  22912. SVGPathSegLinetoRel : false,
  22913. SVGPathSegLinetoVerticalAbs: false,
  22914. SVGPathSegLinetoVerticalRel: false,
  22915. SVGPathSegList : false,
  22916. SVGPathSegMovetoAbs : false,
  22917. SVGPathSegMovetoRel : false,
  22918. SVGPatternElement : false,
  22919. SVGPoint : false,
  22920. SVGPointList : false,
  22921. SVGPolygonElement : false,
  22922. SVGPolylineElement : false,
  22923. SVGPreserveAspectRatio: false,
  22924. SVGRadialGradientElement: false,
  22925. SVGRect : false,
  22926. SVGRectElement : false,
  22927. SVGRenderingIntent : false,
  22928. SVGSVGElement : false,
  22929. SVGScriptElement : false,
  22930. SVGSetElement : false,
  22931. SVGStopElement : false,
  22932. SVGStringList : false,
  22933. SVGStylable : false,
  22934. SVGStyleElement : false,
  22935. SVGSwitchElement : false,
  22936. SVGSymbolElement : false,
  22937. SVGTRefElement : false,
  22938. SVGTSpanElement : false,
  22939. SVGTests : false,
  22940. SVGTextContentElement: false,
  22941. SVGTextElement : false,
  22942. SVGTextPathElement : false,
  22943. SVGTextPositioningElement: false,
  22944. SVGTitleElement : false,
  22945. SVGTransform : false,
  22946. SVGTransformList : false,
  22947. SVGTransformable : false,
  22948. SVGURIReference : false,
  22949. SVGUnitTypes : false,
  22950. SVGUseElement : false,
  22951. SVGVKernElement : false,
  22952. SVGViewElement : false,
  22953. SVGViewSpec : false,
  22954. SVGZoomAndPan : false,
  22955. Text : false,
  22956. TextDecoder : false,
  22957. TextEncoder : false,
  22958. TimeEvent : false,
  22959. top : false,
  22960. URL : false,
  22961. URLSearchParams : false,
  22962. WebGLActiveInfo : false,
  22963. WebGLBuffer : false,
  22964. WebGLContextEvent : false,
  22965. WebGLFramebuffer : false,
  22966. WebGLProgram : false,
  22967. WebGLRenderbuffer : false,
  22968. WebGLRenderingContext: false,
  22969. WebGLShader : false,
  22970. WebGLShaderPrecisionFormat: false,
  22971. WebGLTexture : false,
  22972. WebGLUniformLocation : false,
  22973. WebSocket : false,
  22974. window : false,
  22975. Window : false,
  22976. Worker : false,
  22977. XDomainRequest : false,
  22978. XMLDocument : false,
  22979. XMLHttpRequest : false,
  22980. XMLSerializer : false,
  22981. XPathEvaluator : false,
  22982. XPathException : false,
  22983. XPathExpression : false,
  22984. XPathNamespace : false,
  22985. XPathNSResolver : false,
  22986. XPathResult : false
  22987. };
  22988. exports.devel = {
  22989. alert : false,
  22990. confirm: false,
  22991. console: false,
  22992. Debug : false,
  22993. opera : false,
  22994. prompt : false
  22995. };
  22996. exports.worker = {
  22997. addEventListener : true, // EventTarget
  22998. atob : true, // WindowOrWorkerGlobalScope
  22999. btoa : true, // WindowOrWorkerGlobalScope
  23000. clearInterval : true, // WindowOrWorkerGlobalScope
  23001. clearTimeout : true, // WindowOrWorkerGlobalScope
  23002. createImageBitmap : true, // WindowOrWorkerGlobalScope
  23003. dispatchEvent : true, // EventTarget
  23004. importScripts : true,
  23005. onmessage : true,
  23006. origin : true, // WindowOrWorkerGlobalScope
  23007. postMessage : true,
  23008. queueMicrotask : true, // WindowOrWorkerGlobalScope
  23009. removeEventListener : true, // EventTarget
  23010. self : true,
  23011. setInterval : true, // WindowOrWorkerGlobalScope
  23012. setTimeout : true, // WindowOrWorkerGlobalScope
  23013. FileReaderSync : true
  23014. };
  23015. // Widely adopted global names that are not part of ECMAScript standard
  23016. exports.nonstandard = {
  23017. escape : false,
  23018. unescape: false
  23019. };
  23020. // Globals provided by popular JavaScript environments.
  23021. exports.couch = {
  23022. "require" : false,
  23023. respond : false,
  23024. getRow : false,
  23025. emit : false,
  23026. send : false,
  23027. start : false,
  23028. sum : false,
  23029. log : false,
  23030. exports : false,
  23031. module : false,
  23032. provides : false
  23033. };
  23034. exports.node = {
  23035. __filename : false,
  23036. __dirname : false,
  23037. arguments : false,
  23038. GLOBAL : false,
  23039. global : false,
  23040. module : false,
  23041. require : false,
  23042. Intl : false,
  23043. // These globals are writeable because Node allows the following
  23044. // usage pattern: var Buffer = require("buffer").Buffer;
  23045. Buffer : true,
  23046. console : true,
  23047. exports : true,
  23048. process : true,
  23049. setTimeout : true,
  23050. clearTimeout : true,
  23051. setInterval : true,
  23052. clearInterval : true,
  23053. setImmediate : true, // v0.9.1+
  23054. clearImmediate : true, // v0.9.1+
  23055. URL : true, // v6.13.0+
  23056. URLSearchParams: true // v6.13.0+
  23057. };
  23058. exports.browserify = {
  23059. __filename : false,
  23060. __dirname : false,
  23061. global : false,
  23062. module : false,
  23063. require : false,
  23064. Buffer : true,
  23065. exports : true,
  23066. process : true
  23067. };
  23068. exports.phantom = {
  23069. phantom : true,
  23070. require : true,
  23071. WebPage : true,
  23072. console : true, // in examples, but undocumented
  23073. exports : true // v1.7+
  23074. };
  23075. exports.qunit = {
  23076. asyncTest : false,
  23077. deepEqual : false,
  23078. equal : false,
  23079. expect : false,
  23080. module : false,
  23081. notDeepEqual : false,
  23082. notEqual : false,
  23083. notOk : false,
  23084. notPropEqual : false,
  23085. notStrictEqual : false,
  23086. ok : false,
  23087. propEqual : false,
  23088. QUnit : false,
  23089. raises : false,
  23090. start : false,
  23091. stop : false,
  23092. strictEqual : false,
  23093. test : false,
  23094. "throws" : false
  23095. };
  23096. exports.rhino = {
  23097. arguments : false,
  23098. defineClass : false,
  23099. deserialize : false,
  23100. gc : false,
  23101. help : false,
  23102. importClass : false,
  23103. importPackage: false,
  23104. "java" : false,
  23105. load : false,
  23106. loadClass : false,
  23107. Packages : false,
  23108. print : false,
  23109. quit : false,
  23110. readFile : false,
  23111. readUrl : false,
  23112. runCommand : false,
  23113. seal : false,
  23114. serialize : false,
  23115. spawn : false,
  23116. sync : false,
  23117. toint32 : false,
  23118. version : false
  23119. };
  23120. exports.shelljs = {
  23121. target : false,
  23122. echo : false,
  23123. exit : false,
  23124. cd : false,
  23125. pwd : false,
  23126. ls : false,
  23127. find : false,
  23128. cp : false,
  23129. rm : false,
  23130. mv : false,
  23131. mkdir : false,
  23132. test : false,
  23133. cat : false,
  23134. sed : false,
  23135. grep : false,
  23136. which : false,
  23137. dirs : false,
  23138. pushd : false,
  23139. popd : false,
  23140. env : false,
  23141. exec : false,
  23142. chmod : false,
  23143. config : false,
  23144. error : false,
  23145. tempdir : false
  23146. };
  23147. exports.typed = {
  23148. ArrayBuffer : false,
  23149. ArrayBufferView : false,
  23150. DataView : false,
  23151. Float32Array : false,
  23152. Float64Array : false,
  23153. Int16Array : false,
  23154. Int32Array : false,
  23155. Int8Array : false,
  23156. Uint16Array : false,
  23157. Uint32Array : false,
  23158. Uint8Array : false,
  23159. Uint8ClampedArray : false
  23160. };
  23161. exports.wsh = {
  23162. ActiveXObject : true,
  23163. Enumerator : true,
  23164. GetObject : true,
  23165. ScriptEngine : true,
  23166. ScriptEngineBuildVersion : true,
  23167. ScriptEngineMajorVersion : true,
  23168. ScriptEngineMinorVersion : true,
  23169. VBArray : true,
  23170. WSH : true,
  23171. WScript : true,
  23172. XDomainRequest : true
  23173. };
  23174. // Globals provided by popular JavaScript libraries.
  23175. exports.dojo = {
  23176. dojo : false,
  23177. dijit : false,
  23178. dojox : false,
  23179. define : false,
  23180. "require": false
  23181. };
  23182. exports.jquery = {
  23183. "$" : false,
  23184. jQuery : false
  23185. };
  23186. exports.mootools = {
  23187. "$" : false,
  23188. "$$" : false,
  23189. Asset : false,
  23190. Browser : false,
  23191. Chain : false,
  23192. Class : false,
  23193. Color : false,
  23194. Cookie : false,
  23195. Core : false,
  23196. Document : false,
  23197. DomReady : false,
  23198. DOMEvent : false,
  23199. DOMReady : false,
  23200. Drag : false,
  23201. Element : false,
  23202. Elements : false,
  23203. Event : false,
  23204. Events : false,
  23205. Fx : false,
  23206. Group : false,
  23207. Hash : false,
  23208. HtmlTable : false,
  23209. IFrame : false,
  23210. IframeShim : false,
  23211. InputValidator: false,
  23212. instanceOf : false,
  23213. Keyboard : false,
  23214. Locale : false,
  23215. Mask : false,
  23216. MooTools : false,
  23217. Native : false,
  23218. Options : false,
  23219. OverText : false,
  23220. Request : false,
  23221. Scroller : false,
  23222. Slick : false,
  23223. Slider : false,
  23224. Sortables : false,
  23225. Spinner : false,
  23226. Swiff : false,
  23227. Tips : false,
  23228. Type : false,
  23229. typeOf : false,
  23230. URI : false,
  23231. Window : false
  23232. };
  23233. exports.prototypejs = {
  23234. "$" : false,
  23235. "$$" : false,
  23236. "$A" : false,
  23237. "$F" : false,
  23238. "$H" : false,
  23239. "$R" : false,
  23240. "$break" : false,
  23241. "$continue" : false,
  23242. "$w" : false,
  23243. Abstract : false,
  23244. Ajax : false,
  23245. Class : false,
  23246. Enumerable : false,
  23247. Element : false,
  23248. Event : false,
  23249. Field : false,
  23250. Form : false,
  23251. Hash : false,
  23252. Insertion : false,
  23253. ObjectRange : false,
  23254. PeriodicalExecuter: false,
  23255. Position : false,
  23256. Prototype : false,
  23257. Selector : false,
  23258. Template : false,
  23259. Toggle : false,
  23260. Try : false,
  23261. Autocompleter : false,
  23262. Builder : false,
  23263. Control : false,
  23264. Draggable : false,
  23265. Draggables : false,
  23266. Droppables : false,
  23267. Effect : false,
  23268. Sortable : false,
  23269. SortableObserver : false,
  23270. Sound : false,
  23271. Scriptaculous : false
  23272. };
  23273. exports.yui = {
  23274. YUI : false,
  23275. Y : false,
  23276. YUI_config: false
  23277. };
  23278. exports.mocha = {
  23279. // Global (for config etc.)
  23280. mocha : false,
  23281. // BDD
  23282. describe : false,
  23283. xdescribe : false,
  23284. context : false,
  23285. xcontext : false,
  23286. it : false,
  23287. xit : false,
  23288. specify : false,
  23289. xspecify : false,
  23290. before : false,
  23291. after : false,
  23292. beforeEach : false,
  23293. afterEach : false,
  23294. // TDD
  23295. suite : false,
  23296. test : false,
  23297. setup : false,
  23298. teardown : false,
  23299. suiteSetup : false,
  23300. suiteTeardown : false
  23301. };
  23302. exports.jasmine = {
  23303. jasmine : false,
  23304. describe : false,
  23305. xdescribe : false,
  23306. it : false,
  23307. xit : false,
  23308. beforeEach : false,
  23309. afterEach : false,
  23310. setFixtures : false,
  23311. loadFixtures: false,
  23312. spyOn : false,
  23313. expect : false,
  23314. // Jasmine 1.3
  23315. runs : false,
  23316. waitsFor : false,
  23317. waits : false,
  23318. // Jasmine 2.1
  23319. beforeAll : false,
  23320. afterAll : false,
  23321. fail : false,
  23322. fdescribe : false,
  23323. fit : false,
  23324. pending : false,
  23325. // Jasmine 2.6
  23326. spyOnProperty: false
  23327. };
  23328. },{}],"jshint":[function(require,module,exports){
  23329. /*!
  23330. * JSHint, by JSHint Community.
  23331. *
  23332. * Licensed under the MIT license.
  23333. *
  23334. * JSHint is a derivative work of JSLint:
  23335. *
  23336. * Copyright (c) 2002 Douglas Crockford (www.JSLint.com)
  23337. *
  23338. * Permission is hereby granted, free of charge, to any person obtaining
  23339. * a copy of this software and associated documentation files (the "Software"),
  23340. * to deal in the Software without restriction, including without limitation
  23341. * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  23342. * and/or sell copies of the Software, and to permit persons to whom
  23343. * the Software is furnished to do so, subject to the following conditions:
  23344. *
  23345. * The above copyright notice and this permission notice shall be included
  23346. * in all copies or substantial portions of the Software.
  23347. *
  23348. * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23349. * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23350. * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  23351. * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23352. * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  23353. * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23354. * DEALINGS IN THE SOFTWARE.
  23355. *
  23356. */
  23357. /*jshint quotmark:double */
  23358. /*exported console */
  23359. var _ = require("lodash");
  23360. var events = require("events");
  23361. var vars = require("./vars.js");
  23362. var messages = require("./messages.js");
  23363. var Lexer = require("./lex.js").Lexer;
  23364. var reg = require("./reg.js");
  23365. var state = require("./state.js").state;
  23366. var style = require("./style.js");
  23367. var options = require("./options.js");
  23368. var scopeManager = require("./scope-manager.js");
  23369. var prodParams = require("./prod-params.js");
  23370. // We need this module here because environments such as IE and Rhino
  23371. // don't necessarilly expose the 'console' API and browserify uses
  23372. // it to log things. It's a sad state of affair, really.
  23373. var console = require("console-browserify");
  23374. // We build the application inside a function so that we produce only a singleton
  23375. // variable. That function will be invoked immediately, and its return value is
  23376. // the JSHINT function itself.
  23377. var JSHINT = (function() {
  23378. "use strict";
  23379. var api, // Extension API
  23380. // These are operators that should not be used with the ! operator.
  23381. bang = {
  23382. "<" : true,
  23383. "<=" : true,
  23384. "==" : true,
  23385. "===": true,
  23386. "!==": true,
  23387. "!=" : true,
  23388. ">" : true,
  23389. ">=" : true,
  23390. "+" : true,
  23391. "-" : true,
  23392. "*" : true,
  23393. "/" : true,
  23394. "%" : true
  23395. },
  23396. declared, // Globals that were declared using /*global ... */ syntax.
  23397. functions, // All of the functions
  23398. inblock,
  23399. indent,
  23400. lookahead,
  23401. lex,
  23402. member,
  23403. membersOnly,
  23404. predefined, // Global variables defined by option
  23405. extraModules = [],
  23406. emitter = new events.EventEmitter();
  23407. function checkOption(name, isStable, t) {
  23408. var type, validNames;
  23409. if (isStable) {
  23410. type = "";
  23411. validNames = options.validNames;
  23412. } else {
  23413. type = "unstable ";
  23414. validNames = options.unstableNames;
  23415. }
  23416. name = name.trim();
  23417. if (/^[+-]W\d{3}$/g.test(name)) {
  23418. return true;
  23419. }
  23420. if (validNames.indexOf(name) === -1) {
  23421. if (t.type !== "jslint" && !_.has(options.removed, name)) {
  23422. error("E001", t, type, name);
  23423. return false;
  23424. }
  23425. }
  23426. return true;
  23427. }
  23428. function isString(obj) {
  23429. return Object.prototype.toString.call(obj) === "[object String]";
  23430. }
  23431. function isIdentifier(tkn, value) {
  23432. if (!tkn)
  23433. return false;
  23434. if (!tkn.identifier || tkn.value !== value)
  23435. return false;
  23436. return true;
  23437. }
  23438. /**
  23439. * ES3 defined a set of "FutureReservedWords" in order "to allow for the
  23440. * possibility of future adoption of [proposed] extensions."
  23441. *
  23442. * ES5 reduced the set of FutureReservedWords, in some cases by using them to
  23443. * define new syntactic forms (e.g. `class` and `const`) and in other cases
  23444. * by simply allowing their use as Identifiers (e.g. `int` and `goto`).
  23445. * Separately, ES5 introduced new restrictions on certain tokens, but limited
  23446. * the restriction to strict mode code (e.g. `let` and `yield`).
  23447. *
  23448. * This function determines if a given token describes a reserved word
  23449. * according to the current state of the parser.
  23450. *
  23451. * @param {number} context - the parsing context; see `prod-params.js` for
  23452. * more information
  23453. * @param {Token} token
  23454. */
  23455. function isReserved(context, token) {
  23456. if (!token.reserved) {
  23457. return false;
  23458. }
  23459. var meta = token.meta;
  23460. if (meta && meta.isFutureReservedWord) {
  23461. if (state.inES5()) {
  23462. // ES3 FutureReservedWord in an ES5 environment.
  23463. if (!meta.es5) {
  23464. return false;
  23465. }
  23466. if (token.isProperty) {
  23467. return false;
  23468. }
  23469. }
  23470. } else if (meta && meta.es5 && !state.inES5()) {
  23471. return false;
  23472. }
  23473. // Some identifiers are reserved only within a strict mode environment.
  23474. if (meta && meta.strictOnly && state.inES5()) {
  23475. if (!state.option.strict && !state.isStrict()) {
  23476. return false;
  23477. }
  23478. }
  23479. if (token.id === "await" && (!(context & prodParams.async) && !state.option.module)) {
  23480. return false;
  23481. }
  23482. if (token.id === "yield" && (!(context & prodParams.yield))) {
  23483. return state.isStrict();
  23484. }
  23485. return true;
  23486. }
  23487. function supplant(str, data) {
  23488. return str.replace(/\{([^{}]*)\}/g, function(a, b) {
  23489. var r = data[b];
  23490. return typeof r === "string" || typeof r === "number" ? r : a;
  23491. });
  23492. }
  23493. function combine(dest, src) {
  23494. Object.keys(src).forEach(function(name) {
  23495. if (_.has(JSHINT.blacklist, name)) return;
  23496. dest[name] = src[name];
  23497. });
  23498. }
  23499. function processenforceall() {
  23500. if (state.option.enforceall) {
  23501. for (var enforceopt in options.bool.enforcing) {
  23502. if (state.option[enforceopt] === undefined &&
  23503. !options.noenforceall[enforceopt]) {
  23504. state.option[enforceopt] = true;
  23505. }
  23506. }
  23507. for (var relaxopt in options.bool.relaxing) {
  23508. if (state.option[relaxopt] === undefined) {
  23509. state.option[relaxopt] = false;
  23510. }
  23511. }
  23512. }
  23513. }
  23514. /**
  23515. * Apply all linting options according to the status of the `state` object.
  23516. */
  23517. function applyOptions() {
  23518. var badESOpt = null;
  23519. processenforceall();
  23520. /**
  23521. * TODO: Remove in JSHint 3
  23522. */
  23523. badESOpt = state.inferEsVersion();
  23524. if (badESOpt) {
  23525. quit("E059", state.tokens.next, "esversion", badESOpt);
  23526. }
  23527. if (state.inES5()) {
  23528. combine(predefined, vars.ecmaIdentifiers[5]);
  23529. }
  23530. if (state.inES6()) {
  23531. combine(predefined, vars.ecmaIdentifiers[6]);
  23532. }
  23533. if (state.inES8()) {
  23534. combine(predefined, vars.ecmaIdentifiers[8]);
  23535. }
  23536. /**
  23537. * Use `in` to check for the presence of any explicitly-specified value for
  23538. * `globalstrict` because both `true` and `false` should trigger an error.
  23539. */
  23540. if (state.option.strict === "global" && "globalstrict" in state.option) {
  23541. quit("E059", state.tokens.next, "strict", "globalstrict");
  23542. }
  23543. if (state.option.module) {
  23544. /**
  23545. * TODO: Extend this restriction to *all* ES6-specific options.
  23546. */
  23547. if (!state.inES6()) {
  23548. warning("W134", state.tokens.next, "module", 6);
  23549. }
  23550. }
  23551. if (state.option.regexpu) {
  23552. /**
  23553. * TODO: Extend this restriction to *all* ES6-specific options.
  23554. */
  23555. if (!state.inES6()) {
  23556. warning("W134", state.tokens.next, "regexpu", 6);
  23557. }
  23558. }
  23559. if (state.option.couch) {
  23560. combine(predefined, vars.couch);
  23561. }
  23562. if (state.option.qunit) {
  23563. combine(predefined, vars.qunit);
  23564. }
  23565. if (state.option.rhino) {
  23566. combine(predefined, vars.rhino);
  23567. }
  23568. if (state.option.shelljs) {
  23569. combine(predefined, vars.shelljs);
  23570. combine(predefined, vars.node);
  23571. }
  23572. if (state.option.typed) {
  23573. combine(predefined, vars.typed);
  23574. }
  23575. if (state.option.phantom) {
  23576. combine(predefined, vars.phantom);
  23577. }
  23578. if (state.option.prototypejs) {
  23579. combine(predefined, vars.prototypejs);
  23580. }
  23581. if (state.option.node) {
  23582. combine(predefined, vars.node);
  23583. combine(predefined, vars.typed);
  23584. }
  23585. if (state.option.devel) {
  23586. combine(predefined, vars.devel);
  23587. }
  23588. if (state.option.dojo) {
  23589. combine(predefined, vars.dojo);
  23590. }
  23591. if (state.option.browser) {
  23592. combine(predefined, vars.browser);
  23593. combine(predefined, vars.typed);
  23594. }
  23595. if (state.option.browserify) {
  23596. combine(predefined, vars.browser);
  23597. combine(predefined, vars.typed);
  23598. combine(predefined, vars.browserify);
  23599. }
  23600. if (state.option.nonstandard) {
  23601. combine(predefined, vars.nonstandard);
  23602. }
  23603. if (state.option.jasmine) {
  23604. combine(predefined, vars.jasmine);
  23605. }
  23606. if (state.option.jquery) {
  23607. combine(predefined, vars.jquery);
  23608. }
  23609. if (state.option.mootools) {
  23610. combine(predefined, vars.mootools);
  23611. }
  23612. if (state.option.worker) {
  23613. combine(predefined, vars.worker);
  23614. }
  23615. if (state.option.wsh) {
  23616. combine(predefined, vars.wsh);
  23617. }
  23618. if (state.option.yui) {
  23619. combine(predefined, vars.yui);
  23620. }
  23621. if (state.option.mocha) {
  23622. combine(predefined, vars.mocha);
  23623. }
  23624. }
  23625. // Produce an error warning.
  23626. function quit(code, token, a, b) {
  23627. var percentage = Math.floor((token.line / state.lines.length) * 100);
  23628. var message = messages.errors[code].desc;
  23629. var exception = {
  23630. name: "JSHintError",
  23631. line: token.line,
  23632. character: token.from,
  23633. message: message + " (" + percentage + "% scanned).",
  23634. raw: message,
  23635. code: code,
  23636. a: a,
  23637. b: b
  23638. };
  23639. exception.reason = supplant(message, exception) + " (" + percentage +
  23640. "% scanned).";
  23641. throw exception;
  23642. }
  23643. function removeIgnoredMessages() {
  23644. var ignored = state.ignoredLines;
  23645. if (_.isEmpty(ignored)) return;
  23646. JSHINT.errors = _.reject(JSHINT.errors, function(err) { return ignored[err.line] });
  23647. }
  23648. function warning(code, t, a, b, c, d) {
  23649. var ch, l, w, msg;
  23650. if (/^W\d{3}$/.test(code)) {
  23651. if (state.ignored[code])
  23652. return;
  23653. msg = messages.warnings[code];
  23654. } else if (/E\d{3}/.test(code)) {
  23655. msg = messages.errors[code];
  23656. } else if (/I\d{3}/.test(code)) {
  23657. msg = messages.info[code];
  23658. }
  23659. t = t || state.tokens.next || {};
  23660. if (t.id === "(end)") { // `~
  23661. t = state.tokens.curr;
  23662. }
  23663. l = t.line;
  23664. ch = t.from;
  23665. w = {
  23666. id: "(error)",
  23667. raw: msg.desc,
  23668. code: msg.code,
  23669. evidence: state.lines[l - 1] || "",
  23670. line: l,
  23671. character: ch,
  23672. scope: JSHINT.scope,
  23673. a: a,
  23674. b: b,
  23675. c: c,
  23676. d: d
  23677. };
  23678. w.reason = supplant(msg.desc, w);
  23679. JSHINT.errors.push(w);
  23680. removeIgnoredMessages();
  23681. var errors = JSHINT.errors.filter(function(e) { return /E\d{3}/.test(e.code); });
  23682. if (errors.length >= state.option.maxerr) {
  23683. quit("E043", t);
  23684. }
  23685. return w;
  23686. }
  23687. function warningAt(m, l, ch, a, b, c, d) {
  23688. return warning(m, {
  23689. line: l,
  23690. from: ch
  23691. }, a, b, c, d);
  23692. }
  23693. function error(m, t, a, b, c, d) {
  23694. warning(m, t, a, b, c, d);
  23695. }
  23696. function errorAt(m, l, ch, a, b, c, d) {
  23697. return error(m, {
  23698. line: l,
  23699. from: ch
  23700. }, a, b, c, d);
  23701. }
  23702. // Tracking of "internal" scripts, like eval containing a static string
  23703. function addEvalCode(elem, token) {
  23704. JSHINT.internals.push({
  23705. id: "(internal)",
  23706. elem: elem,
  23707. token: token,
  23708. code: token.value.replace(/([^\\])(\\*)\2\\n/g, "$1\n")
  23709. });
  23710. }
  23711. /**
  23712. * Process an inline linting directive
  23713. *
  23714. * @param {Token} directiveToken - the directive-bearing comment token
  23715. * @param {Token} previous - the token that preceeds the directive
  23716. */
  23717. function lintingDirective(directiveToken, previous) {
  23718. var body = directiveToken.body.split(",")
  23719. .map(function(s) { return s.trim(); });
  23720. var predef = {};
  23721. if (directiveToken.type === "falls through") {
  23722. previous.caseFallsThrough = true;
  23723. return;
  23724. }
  23725. if (directiveToken.type === "globals") {
  23726. body.forEach(function(item, idx) {
  23727. var parts = item.split(":");
  23728. var key = parts[0].trim();
  23729. if (key === "-" || !key.length) {
  23730. // Ignore trailing comma
  23731. if (idx > 0 && idx === body.length - 1) {
  23732. return;
  23733. }
  23734. error("E002", directiveToken);
  23735. return;
  23736. }
  23737. if (key.charAt(0) === "-") {
  23738. key = key.slice(1);
  23739. JSHINT.blacklist[key] = key;
  23740. delete predefined[key];
  23741. } else {
  23742. predef[key] = parts.length > 1 && parts[1].trim() === "true";
  23743. }
  23744. });
  23745. combine(predefined, predef);
  23746. for (var key in predef) {
  23747. if (_.has(predef, key)) {
  23748. declared[key] = directiveToken;
  23749. }
  23750. }
  23751. }
  23752. if (directiveToken.type === "exported") {
  23753. body.forEach(function(e, idx) {
  23754. if (!e.length) {
  23755. // Ignore trailing comma
  23756. if (idx > 0 && idx === body.length - 1) {
  23757. return;
  23758. }
  23759. error("E002", directiveToken);
  23760. return;
  23761. }
  23762. state.funct["(scope)"].addExported(e);
  23763. });
  23764. }
  23765. if (directiveToken.type === "members") {
  23766. membersOnly = membersOnly || {};
  23767. body.forEach(function(m) {
  23768. var ch1 = m.charAt(0);
  23769. var ch2 = m.charAt(m.length - 1);
  23770. if (ch1 === ch2 && (ch1 === "\"" || ch1 === "'")) {
  23771. m = m
  23772. .substr(1, m.length - 2)
  23773. .replace("\\\"", "\"");
  23774. }
  23775. membersOnly[m] = false;
  23776. });
  23777. }
  23778. var numvals = [
  23779. "maxstatements",
  23780. "maxparams",
  23781. "maxdepth",
  23782. "maxcomplexity",
  23783. "maxerr",
  23784. "maxlen",
  23785. "indent"
  23786. ];
  23787. if (directiveToken.type === "jshint" || directiveToken.type === "jslint" ||
  23788. directiveToken.type === "jshint.unstable") {
  23789. body.forEach(function(item) {
  23790. var parts = item.split(":");
  23791. var key = parts[0].trim();
  23792. var val = parts.length > 1 ? parts[1].trim() : "";
  23793. var numberVal;
  23794. if (!checkOption(key, directiveToken.type !== "jshint.unstable", directiveToken)) {
  23795. return;
  23796. }
  23797. if (numvals.indexOf(key) >= 0) {
  23798. // GH988 - numeric options can be disabled by setting them to `false`
  23799. if (val !== "false") {
  23800. numberVal = +val;
  23801. if (typeof numberVal !== "number" || !isFinite(numberVal) ||
  23802. numberVal <= 0 || Math.floor(numberVal) !== numberVal) {
  23803. error("E032", directiveToken, val);
  23804. return;
  23805. }
  23806. state.option[key] = numberVal;
  23807. } else {
  23808. state.option[key] = key === "indent" ? 4 : false;
  23809. }
  23810. return;
  23811. }
  23812. if (key === "validthis") {
  23813. // `validthis` is valid only within a function scope.
  23814. if (state.funct["(global)"])
  23815. return void error("E009");
  23816. if (val !== "true" && val !== "false")
  23817. return void error("E002", directiveToken);
  23818. state.option.validthis = (val === "true");
  23819. return;
  23820. }
  23821. if (key === "quotmark") {
  23822. switch (val) {
  23823. case "true":
  23824. case "false":
  23825. state.option.quotmark = (val === "true");
  23826. break;
  23827. case "double":
  23828. case "single":
  23829. state.option.quotmark = val;
  23830. break;
  23831. default:
  23832. error("E002", directiveToken);
  23833. }
  23834. return;
  23835. }
  23836. if (key === "shadow") {
  23837. switch (val) {
  23838. case "true":
  23839. state.option.shadow = true;
  23840. break;
  23841. case "outer":
  23842. state.option.shadow = "outer";
  23843. break;
  23844. case "false":
  23845. case "inner":
  23846. state.option.shadow = "inner";
  23847. break;
  23848. default:
  23849. error("E002", directiveToken);
  23850. }
  23851. return;
  23852. }
  23853. if (key === "unused") {
  23854. switch (val) {
  23855. case "true":
  23856. state.option.unused = true;
  23857. break;
  23858. case "false":
  23859. state.option.unused = false;
  23860. break;
  23861. case "vars":
  23862. case "strict":
  23863. state.option.unused = val;
  23864. break;
  23865. default:
  23866. error("E002", directiveToken);
  23867. }
  23868. return;
  23869. }
  23870. if (key === "latedef") {
  23871. switch (val) {
  23872. case "true":
  23873. state.option.latedef = true;
  23874. break;
  23875. case "false":
  23876. state.option.latedef = false;
  23877. break;
  23878. case "nofunc":
  23879. state.option.latedef = "nofunc";
  23880. break;
  23881. default:
  23882. error("E002", directiveToken);
  23883. }
  23884. return;
  23885. }
  23886. if (key === "ignore") {
  23887. switch (val) {
  23888. case "line":
  23889. state.ignoredLines[directiveToken.line] = true;
  23890. removeIgnoredMessages();
  23891. break;
  23892. default:
  23893. error("E002", directiveToken);
  23894. }
  23895. return;
  23896. }
  23897. if (key === "strict") {
  23898. switch (val) {
  23899. case "true":
  23900. state.option.strict = true;
  23901. break;
  23902. case "false":
  23903. state.option.strict = false;
  23904. break;
  23905. case "global":
  23906. case "implied":
  23907. state.option.strict = val;
  23908. break;
  23909. default:
  23910. error("E002", directiveToken);
  23911. }
  23912. return;
  23913. }
  23914. if (key === "module") {
  23915. /**
  23916. * TODO: Extend this restriction to *all* "environmental" options.
  23917. */
  23918. if (!hasParsedCode(state.funct)) {
  23919. error("E055", directiveToken, "module");
  23920. }
  23921. }
  23922. if (key === "esversion") {
  23923. switch (val) {
  23924. case "3":
  23925. case "5":
  23926. case "6":
  23927. case "7":
  23928. case "8":
  23929. case "9":
  23930. case "10":
  23931. case "11":
  23932. state.option.moz = false;
  23933. state.option.esversion = +val;
  23934. break;
  23935. case "2015":
  23936. case "2016":
  23937. case "2017":
  23938. case "2018":
  23939. case "2019":
  23940. case "2020":
  23941. state.option.moz = false;
  23942. // Translate specification publication year to version number.
  23943. state.option.esversion = +val - 2009;
  23944. break;
  23945. default:
  23946. error("E002", directiveToken);
  23947. }
  23948. if (!hasParsedCode(state.funct)) {
  23949. error("E055", directiveToken, "esversion");
  23950. }
  23951. return;
  23952. }
  23953. var match = /^([+-])(W\d{3})$/g.exec(key);
  23954. if (match) {
  23955. // ignore for -W..., unignore for +W...
  23956. state.ignored[match[2]] = (match[1] === "-");
  23957. return;
  23958. }
  23959. var tn;
  23960. if (val === "true" || val === "false") {
  23961. if (directiveToken.type === "jslint") {
  23962. tn = options.renamed[key] || key;
  23963. state.option[tn] = (val === "true");
  23964. if (options.inverted[tn] !== undefined) {
  23965. state.option[tn] = !state.option[tn];
  23966. }
  23967. } else if (directiveToken.type === "jshint.unstable") {
  23968. /* istanbul ignore next */
  23969. state.option.unstable[key] = (val === "true");
  23970. } else {
  23971. state.option[key] = (val === "true");
  23972. }
  23973. return;
  23974. }
  23975. error("E002", directiveToken);
  23976. });
  23977. applyOptions();
  23978. }
  23979. }
  23980. /**
  23981. * Return a token beyond the token available in `state.tokens.next`. If no
  23982. * such token exists, return the "(end)" token. This function is used to
  23983. * determine parsing strategies in cases where the value of the next token
  23984. * does not provide sufficient information, as is the case with `for` loops,
  23985. * e.g.:
  23986. *
  23987. * for ( var i in ...
  23988. *
  23989. * versus:
  23990. *
  23991. * for ( var i = ...
  23992. *
  23993. * @param {number} [p] - offset of desired token; defaults to 0
  23994. *
  23995. * @returns {token}
  23996. */
  23997. function peek(p) {
  23998. var i = p || 0, j = lookahead.length, t;
  23999. if (i < j) {
  24000. return lookahead[i];
  24001. }
  24002. while (j <= i) {
  24003. t = lex.token();
  24004. // When the lexer is exhausted, this function should produce the "(end)"
  24005. // token, even in cases where the requested token is beyond the end of
  24006. // the input stream.
  24007. if (!t) {
  24008. // If the lookahead buffer is empty, the expected "(end)" token was
  24009. // already emitted by the most recent invocation of `advance` and is
  24010. // available as the next token.
  24011. if (!lookahead.length) {
  24012. return state.tokens.next;
  24013. }
  24014. return lookahead[j - 1];
  24015. }
  24016. lookahead[j] = t;
  24017. j += 1;
  24018. }
  24019. return t;
  24020. }
  24021. function peekIgnoreEOL() {
  24022. var i = 0;
  24023. var t;
  24024. do {
  24025. t = peek(i++);
  24026. } while (t.id === "(endline)");
  24027. return t;
  24028. }
  24029. /**
  24030. * Consume the next token.
  24031. *
  24032. * @param {string} [expected] - the expected value of the next token's `id`
  24033. * property (in the case of punctuators) or
  24034. * `value` property (in the case of identifiers
  24035. * and literals); if unspecified, any token will
  24036. * be accepted
  24037. * @param {object} [relatedToken] - the token that informed the expected
  24038. * value, if any (for example: the opening
  24039. * brace when a closing brace is expected);
  24040. * used to produce more meaningful errors
  24041. */
  24042. function advance(expected, relatedToken) {
  24043. var nextToken = state.tokens.next;
  24044. if (expected && nextToken.id !== expected) {
  24045. if (relatedToken) {
  24046. if (nextToken.id === "(end)") {
  24047. error("E019", relatedToken, relatedToken.id);
  24048. } else {
  24049. error("E020", nextToken, expected, relatedToken.id,
  24050. relatedToken.line, nextToken.value);
  24051. }
  24052. } else if (nextToken.type !== "(identifier)" || nextToken.value !== expected) {
  24053. error("E021", nextToken, expected, nextToken.value);
  24054. }
  24055. }
  24056. state.tokens.prev = state.tokens.curr;
  24057. state.tokens.curr = state.tokens.next;
  24058. for (;;) {
  24059. state.tokens.next = lookahead.shift() || lex.token();
  24060. if (!state.tokens.next) { // No more tokens left, give up
  24061. quit("E041", state.tokens.curr);
  24062. }
  24063. if (state.tokens.next.id === "(end)" || state.tokens.next.id === "(error)") {
  24064. return;
  24065. }
  24066. if (state.tokens.next.check) {
  24067. state.tokens.next.check();
  24068. }
  24069. if (state.tokens.next.isSpecial) {
  24070. lintingDirective(state.tokens.next, state.tokens.curr);
  24071. } else {
  24072. if (state.tokens.next.id !== "(endline)") {
  24073. break;
  24074. }
  24075. }
  24076. }
  24077. }
  24078. /**
  24079. * Determine whether a given token is an operator.
  24080. *
  24081. * @param {token} token
  24082. *
  24083. * @returns {boolean}
  24084. */
  24085. function isOperator(token) {
  24086. return token.first || token.right || token.left || token.id === "yield" || token.id === "await";
  24087. }
  24088. function isEndOfExpr(context, curr, next) {
  24089. if (arguments.length <= 1) {
  24090. curr = state.tokens.curr;
  24091. next = state.tokens.next;
  24092. }
  24093. if (next.id === "in" && context & prodParams.noin) {
  24094. return true;
  24095. }
  24096. if (next.id === ";" || next.id === "}" || next.id === ":") {
  24097. return true;
  24098. }
  24099. if (next.infix === curr.infix ||
  24100. // Infix operators which follow `yield` should only be consumed as part
  24101. // of the current expression if allowed by the syntactic grammar. In
  24102. // effect, this prevents automatic semicolon insertion when `yield` is
  24103. // followed by a newline and a comma operator (without enabling it when
  24104. // `yield` is followed by a newline and a `[` token).
  24105. (curr.id === "yield" && curr.rbp < next.rbp)) {
  24106. return !sameLine(curr, next);
  24107. }
  24108. return false;
  24109. }
  24110. /**
  24111. * The `expression` function is the heart of JSHint's parsing behaior. It is
  24112. * based on the Pratt parser, but it extends that model with a `fud` method.
  24113. * Short for "first null denotation," it it similar to the `nud` ("null
  24114. * denotation") function, but it is only used on the first token of a
  24115. * statement. This simplifies usage in statement-oriented languages like
  24116. * JavaScript.
  24117. *
  24118. * .nud Null denotation
  24119. * .fud First null denotation
  24120. * .led Left denotation
  24121. * lbp Left binding power
  24122. * rbp Right binding power
  24123. *
  24124. * They are elements of the parsing method called Top Down Operator Precedence.
  24125. *
  24126. * In addition to parsing, this function applies a number of linting patterns.
  24127. *
  24128. * @param {number} context - the parsing context (a bitfield describing
  24129. * conditions of the current parsing operation
  24130. * which can influence how the next tokens are
  24131. * interpreted); see `prod-params.js` for more
  24132. * detail)
  24133. * @param {number} rbp - the right-binding power of the token to be consumed
  24134. */
  24135. function expression(context, rbp) {
  24136. var left, isArray = false, isObject = false;
  24137. var initial = context & prodParams.initial;
  24138. var curr;
  24139. context &= ~prodParams.initial;
  24140. state.nameStack.push();
  24141. if (state.tokens.next.id === "(end)")
  24142. error("E006", state.tokens.curr);
  24143. advance();
  24144. if (initial) {
  24145. state.funct["(verb)"] = state.tokens.curr.value;
  24146. state.tokens.curr.beginsStmt = true;
  24147. }
  24148. curr = state.tokens.curr;
  24149. if (initial && curr.fud && (!curr.useFud || curr.useFud(context))) {
  24150. left = state.tokens.curr.fud(context);
  24151. } else {
  24152. if (state.tokens.curr.nud) {
  24153. left = state.tokens.curr.nud(context, rbp);
  24154. } else {
  24155. error("E030", state.tokens.curr, state.tokens.curr.id);
  24156. }
  24157. while (rbp < state.tokens.next.lbp && !isEndOfExpr(context)) {
  24158. isArray = state.tokens.curr.value === "Array";
  24159. isObject = state.tokens.curr.value === "Object";
  24160. // #527, new Foo.Array(), Foo.Array(), new Foo.Object(), Foo.Object()
  24161. // Line breaks in IfStatement heads exist to satisfy the checkJSHint
  24162. // "Line too long." error.
  24163. if (left && (left.value || (left.first && left.first.value))) {
  24164. // If the left.value is not "new", or the left.first.value is a "."
  24165. // then safely assume that this is not "new Array()" and possibly
  24166. // not "new Object()"...
  24167. if (left.value !== "new" ||
  24168. (left.first && left.first.value && left.first.value === ".")) {
  24169. isArray = false;
  24170. // ...In the case of Object, if the left.value and state.tokens.curr.value
  24171. // are not equal, then safely assume that this not "new Object()"
  24172. if (left.value !== state.tokens.curr.value) {
  24173. isObject = false;
  24174. }
  24175. }
  24176. }
  24177. advance();
  24178. if (isArray && state.tokens.curr.id === "(" && state.tokens.next.id === ")") {
  24179. warning("W009", state.tokens.curr);
  24180. }
  24181. if (isObject && state.tokens.curr.id === "(" && state.tokens.next.id === ")") {
  24182. warning("W010", state.tokens.curr);
  24183. }
  24184. if (left && state.tokens.curr.led) {
  24185. left = state.tokens.curr.led(context, left);
  24186. } else {
  24187. error("E033", state.tokens.curr, state.tokens.curr.id);
  24188. }
  24189. }
  24190. }
  24191. state.nameStack.pop();
  24192. return left;
  24193. }
  24194. // Functions for conformance of style.
  24195. function sameLine(first, second) {
  24196. return first.line === (second.startLine || second.line);
  24197. }
  24198. function nobreaknonadjacent(left, right) {
  24199. if (!state.option.laxbreak && !sameLine(left, right)) {
  24200. warning("W014", right, right.value);
  24201. }
  24202. }
  24203. function nolinebreak(t) {
  24204. if (!sameLine(t, state.tokens.next)) {
  24205. warning("E022", t, t.value);
  24206. }
  24207. }
  24208. /**
  24209. * Validate the comma token in the "current" position of the token stream.
  24210. *
  24211. * @param {object} [opts]
  24212. * @param {boolean} [opts.property] - flag indicating whether the current
  24213. * comma token is situated directly within
  24214. * an object initializer
  24215. * @param {boolean} [opts.allowTrailing] - flag indicating whether the
  24216. * current comma token may appear
  24217. * directly before a delimiter
  24218. *
  24219. * @returns {boolean} flag indicating the validity of the current comma
  24220. * token; `false` if the token directly causes a syntax
  24221. * error, `true` otherwise
  24222. */
  24223. function checkComma(opts) {
  24224. var prev = state.tokens.prev;
  24225. var curr = state.tokens.curr;
  24226. opts = opts || {};
  24227. if (!sameLine(prev, curr)) {
  24228. if (!state.option.laxcomma) {
  24229. if (checkComma.first) {
  24230. warning("I001", curr);
  24231. checkComma.first = false;
  24232. }
  24233. warning("W014", prev, curr.value);
  24234. }
  24235. }
  24236. if (state.tokens.next.identifier && !(opts.property && state.inES5())) {
  24237. // Keywords that cannot follow a comma operator.
  24238. switch (state.tokens.next.value) {
  24239. case "break":
  24240. case "case":
  24241. case "catch":
  24242. case "continue":
  24243. case "default":
  24244. case "do":
  24245. case "else":
  24246. case "finally":
  24247. case "for":
  24248. case "if":
  24249. case "in":
  24250. case "instanceof":
  24251. case "return":
  24252. case "switch":
  24253. case "throw":
  24254. case "try":
  24255. case "var":
  24256. case "let":
  24257. case "while":
  24258. case "with":
  24259. error("E024", state.tokens.next, state.tokens.next.value);
  24260. return false;
  24261. }
  24262. }
  24263. if (state.tokens.next.type === "(punctuator)") {
  24264. switch (state.tokens.next.value) {
  24265. case "}":
  24266. case "]":
  24267. case ",":
  24268. case ")":
  24269. if (opts.allowTrailing) {
  24270. return true;
  24271. }
  24272. error("E024", state.tokens.next, state.tokens.next.value);
  24273. return false;
  24274. }
  24275. }
  24276. return true;
  24277. }
  24278. /**
  24279. * Factory function for creating "symbols"--objects that will be inherited by
  24280. * tokens. The objects created by this function are stored in a symbol table
  24281. * and set as the prototype of the tokens generated by the lexer.
  24282. *
  24283. * Note that this definition of "symbol" describes an implementation detail
  24284. * of JSHint and is not related to the ECMAScript value type introduced in
  24285. * ES2015.
  24286. *
  24287. * @param {string} s - the name of the token; for keywords (e.g. `void`) and
  24288. * delimiters (e.g.. `[`), this is the token's text
  24289. * representation; for literals (e.g. numbers) and other
  24290. * "special" tokens (e.g. the end-of-file marker) this is
  24291. * a parenthetical value
  24292. * @param {number} p - the left-binding power of the token as used by the
  24293. * Pratt parsing semantics
  24294. *
  24295. * @returns {object} - the object describing the JSHint symbol (provided to
  24296. * support cases where further refinement is necessary)
  24297. */
  24298. function symbol(s, p) {
  24299. var x = state.syntax[s];
  24300. if (!x || typeof x !== "object") {
  24301. state.syntax[s] = x = {
  24302. id: s,
  24303. lbp: p,
  24304. // Symbols that accept a right-hand side do so with a binding power
  24305. // that is commonly identical to their left-binding power. (This value
  24306. // is relevant when determining if the grouping operator is necessary
  24307. // to override the precedence of surrounding operators.) Because the
  24308. // exponentiation operator's left-binding power and right-binding power
  24309. // are distinct, the values must be encoded separately.
  24310. rbp: p,
  24311. value: s
  24312. };
  24313. }
  24314. return x;
  24315. }
  24316. /**
  24317. * Convenience function for defining delimiter symbols.
  24318. *
  24319. * @param {string} s - the name of the symbol
  24320. *
  24321. * @returns {object} - the object describing the JSHint symbol (provided to
  24322. * support cases where further refinement is necessary)
  24323. */
  24324. function delim(s) {
  24325. var x = symbol(s, 0);
  24326. x.delim = true;
  24327. return x;
  24328. }
  24329. /**
  24330. * Convenience function for defining statement-denoting symbols.
  24331. *
  24332. * @param {string} s - the name of the symbol
  24333. * @param {function} f - the first null denotation function for the symbol;
  24334. * see the `expression` function for more detail
  24335. *
  24336. * @returns {object} - the object describing the JSHint symbol (provided to
  24337. * support cases where further refinement is necessary)
  24338. */
  24339. function stmt(s, f) {
  24340. var x = delim(s);
  24341. x.identifier = x.reserved = true;
  24342. x.fud = f;
  24343. return x;
  24344. }
  24345. /**
  24346. * Convenience function for defining block-statement-denoting symbols.
  24347. *
  24348. * A block-statement-denoting symbol is one like 'if' or 'for', which will be
  24349. * followed by a block and will not have to end with a semicolon.
  24350. *
  24351. * @param {string} s - the name of the symbol
  24352. * @param {function} - the first null denotation function for the symbol; see
  24353. * the `expression` function for more detail
  24354. *
  24355. * @returns {object} - the object describing the JSHint symbol (provided to
  24356. * support cases where further refinement is necessary)
  24357. */
  24358. function blockstmt(s, f) {
  24359. var x = stmt(s, f);
  24360. x.block = true;
  24361. return x;
  24362. }
  24363. /**
  24364. * Denote a given JSHint symbol as an identifier and a reserved keyword.
  24365. *
  24366. * @param {object} - a JSHint symbol value
  24367. *
  24368. * @returns {object} - the provided object
  24369. */
  24370. function reserveName(x) {
  24371. var c = x.id.charAt(0);
  24372. if ((c >= "a" && c <= "z") || (c >= "A" && c <= "Z")) {
  24373. x.identifier = x.reserved = true;
  24374. }
  24375. return x;
  24376. }
  24377. /**
  24378. * Convenience function for defining "prefix" symbols--operators that accept
  24379. * expressions as a right-hand side.
  24380. *
  24381. * @param {string} s - the name of the symbol
  24382. * @param {function} [f] - the first null denotation function for the symbol;
  24383. * see the `expression` function for more detail
  24384. *
  24385. * @returns {object} - the object describing the JSHint symbol (provided to
  24386. * support cases where further refinement is necessary)
  24387. */
  24388. function prefix(s, f) {
  24389. var x = symbol(s, 150);
  24390. reserveName(x);
  24391. x.nud = (typeof f === "function") ? f : function(context) {
  24392. this.arity = "unary";
  24393. this.right = expression(context, 150);
  24394. if (this.id === "++" || this.id === "--") {
  24395. if (state.option.plusplus) {
  24396. warning("W016", this, this.id);
  24397. }
  24398. if (this.right) {
  24399. checkLeftSideAssign(context, this.right, this);
  24400. }
  24401. }
  24402. return this;
  24403. };
  24404. return x;
  24405. }
  24406. /**
  24407. * Convenience function for defining "type" symbols--those that describe
  24408. * literal values.
  24409. *
  24410. * @param {string} s - the name of the symbol
  24411. * @param {function} f - the first null denotation function for the symbol;
  24412. * see the `expression` function for more detail
  24413. *
  24414. * @returns {object} - the object describing the JSHint symbol (provided to
  24415. * support cases where further refinement is necessary)
  24416. */
  24417. function type(s, f) {
  24418. var x = symbol(s, 0);
  24419. x.type = s;
  24420. x.nud = f;
  24421. return x;
  24422. }
  24423. /**
  24424. * Convenience function for defining JSHint symbols for reserved
  24425. * keywords--those that are restricted from use as bindings (and as property
  24426. * names in ECMAScript 3 environments).
  24427. *
  24428. * @param {string} s - the name of the symbol
  24429. * @param {function} func - the first null denotation function for the
  24430. * symbol; see the `expression` function for more
  24431. * detail
  24432. *
  24433. * @returns {object} - the object describing the JSHint symbol (provided to
  24434. * support cases where further refinement is necessary)
  24435. */
  24436. function reserve(name, func) {
  24437. var x = type(name, func);
  24438. x.identifier = true;
  24439. x.reserved = true;
  24440. return x;
  24441. }
  24442. /**
  24443. * Convenience function for defining JSHint symbols for keywords that are
  24444. * only reserved in some circumstances.
  24445. *
  24446. * @param {string} name - the name of the symbol
  24447. * @param {object} [meta] - a collection of optional arguments
  24448. * @param {function} [meta.nud] -the null denotation function for the symbol;
  24449. * see the `expression` function for more detail
  24450. * @param {boolean} [meta.es5] - `true` if the identifier is reserved
  24451. * in ECMAScript 5 or later
  24452. * @param {boolean} [meta.strictOnly] - `true` if the identifier is only
  24453. * reserved in strict mode code.
  24454. *
  24455. * @returns {object} - the object describing the JSHint symbol (provided to
  24456. * support cases where further refinement is necessary)
  24457. */
  24458. function FutureReservedWord(name, meta) {
  24459. var x = type(name, state.syntax["(identifier)"].nud);
  24460. meta = meta || {};
  24461. meta.isFutureReservedWord = true;
  24462. x.value = name;
  24463. x.identifier = true;
  24464. x.reserved = true;
  24465. x.meta = meta;
  24466. return x;
  24467. }
  24468. /**
  24469. * Convenience function for defining "infix" symbols--operators that require
  24470. * operands as both "land-hand side" and "right-hand side".
  24471. *
  24472. * @param {string} s - the name of the symbol
  24473. * @param {function} [f] - a function to be invoked that consumes the
  24474. * right-hand side of the operator
  24475. * @param {number} p - the left-binding power of the token as used by the
  24476. * Pratt parsing semantics
  24477. * @param {boolean} [w] - if `true`
  24478. *
  24479. * @returns {object} - the object describing the JSHint symbol (provided to
  24480. * support cases where further refinement is necessary)
  24481. */
  24482. function infix(s, f, p, w) {
  24483. var x = symbol(s, p);
  24484. reserveName(x);
  24485. x.infix = true;
  24486. x.led = function(context, left) {
  24487. if (!w) {
  24488. nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
  24489. }
  24490. if ((s === "in" || s === "instanceof") && left.id === "!") {
  24491. warning("W018", left, "!");
  24492. }
  24493. if (typeof f === "function") {
  24494. return f(context, left, this);
  24495. } else {
  24496. this.left = left;
  24497. this.right = expression(context, p);
  24498. return this;
  24499. }
  24500. };
  24501. return x;
  24502. }
  24503. /**
  24504. * Convenience function for defining the `=>` token as used in arrow
  24505. * functions.
  24506. *
  24507. * @param {string} s - the name of the symbol
  24508. *
  24509. * @returns {object} - the object describing the JSHint symbol (provided to
  24510. * support cases where further refinement is necessary)
  24511. */
  24512. function application(s) {
  24513. var x = symbol(s, 42);
  24514. x.infix = true;
  24515. x.led = function(context, left) {
  24516. nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
  24517. this.left = left;
  24518. this.right = doFunction(context, { type: "arrow", loneArg: left });
  24519. return this;
  24520. };
  24521. return x;
  24522. }
  24523. /**
  24524. * Convenience function for defining JSHint symbols for relation operators.
  24525. *
  24526. * @param {string} s - the name of the symbol
  24527. * @param {function} [f] - a function to be invoked to enforce any additional
  24528. * linting rules.
  24529. *
  24530. * @returns {object} - the object describing the JSHint symbol (provided to
  24531. * support cases where further refinement is necessary)
  24532. */
  24533. function relation(s, f) {
  24534. var x = symbol(s, 100);
  24535. x.infix = true;
  24536. x.led = function(context, left) {
  24537. nobreaknonadjacent(state.tokens.prev, state.tokens.curr);
  24538. this.left = left;
  24539. var right = this.right = expression(context, 100);
  24540. if (isIdentifier(left, "NaN") || isIdentifier(right, "NaN")) {
  24541. warning("W019", this);
  24542. } else if (f) {
  24543. f.apply(this, [context, left, right]);
  24544. }
  24545. if (!left || !right) {
  24546. quit("E041", state.tokens.curr);
  24547. }
  24548. if (left.id === "!") {
  24549. warning("W018", left, "!");
  24550. }
  24551. if (right.id === "!") {
  24552. warning("W018", right, "!");
  24553. }
  24554. return this;
  24555. };
  24556. return x;
  24557. }
  24558. /**
  24559. * Determine if a given token marks the beginning of a UnaryExpression.
  24560. *
  24561. * @param {object} token
  24562. *
  24563. * @returns {boolean}
  24564. */
  24565. function beginsUnaryExpression(token) {
  24566. return token.arity === "unary" && token.id !== "++" && token.id !== "--";
  24567. }
  24568. var typeofValues = {};
  24569. typeofValues.legacy = [
  24570. // E4X extended the `typeof` operator to return "xml" for the XML and
  24571. // XMLList types it introduced.
  24572. // Ref: 11.3.2 The typeof Operator
  24573. // http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-357.pdf
  24574. "xml",
  24575. // IE<9 reports "unknown" when the `typeof` operator is applied to an
  24576. // object existing across a COM+ bridge. In lieu of official documentation
  24577. // (which does not exist), see:
  24578. // http://robertnyman.com/2005/12/21/what-is-typeof-unknown/
  24579. "unknown"
  24580. ];
  24581. typeofValues.es3 = [
  24582. "undefined", "boolean", "number", "string", "function", "object",
  24583. ];
  24584. typeofValues.es3 = typeofValues.es3.concat(typeofValues.legacy);
  24585. typeofValues.es6 = typeofValues.es3.concat("symbol", "bigint");
  24586. /**
  24587. * Validate comparisons between the result of a `typeof` expression and a
  24588. * string literal.
  24589. *
  24590. * @param {token} [left] - one of the values being compared
  24591. * @param {token} [right] - the other value being compared
  24592. * @param {object} state - the global state object (see `state.js`)
  24593. *
  24594. * @returns {boolean} - `false` if the second token describes a `typeof`
  24595. * expression and the first token is a string literal
  24596. * whose value is never returned by that operator;
  24597. * `true` otherwise
  24598. */
  24599. function isTypoTypeof(left, right, state) {
  24600. var values;
  24601. if (state.option.notypeof)
  24602. return false;
  24603. if (!left || !right)
  24604. return false;
  24605. values = state.inES6() ? typeofValues.es6 : typeofValues.es3;
  24606. if (right.type === "(identifier)" && right.value === "typeof" && left.type === "(string)") {
  24607. if (left.value === "bigint") {
  24608. if (!state.inES11()) {
  24609. warning("W119", left, "BigInt", "11");
  24610. }
  24611. return false;
  24612. }
  24613. return !_.includes(values, left.value);
  24614. }
  24615. return false;
  24616. }
  24617. /**
  24618. * Determine if a given token describes the built-in `eval` function.
  24619. *
  24620. * @param {token} left
  24621. * @param {object} state - the global state object (see `state.js`)
  24622. *
  24623. * @returns {boolean}
  24624. */
  24625. function isGlobalEval(left, state) {
  24626. var isGlobal = false;
  24627. // permit methods to refer to an "eval" key in their own context
  24628. if (left.type === "this" && state.funct["(context)"] === null) {
  24629. isGlobal = true;
  24630. }
  24631. // permit use of "eval" members of objects
  24632. else if (left.type === "(identifier)") {
  24633. if (state.option.node && left.value === "global") {
  24634. isGlobal = true;
  24635. }
  24636. else if (state.option.browser && (left.value === "window" || left.value === "document")) {
  24637. isGlobal = true;
  24638. }
  24639. }
  24640. return isGlobal;
  24641. }
  24642. /**
  24643. * Determine if a given token describes a property of a built-in object.
  24644. *
  24645. * @param {token} left
  24646. *
  24647. * @returns {boolean}
  24648. */
  24649. function findNativePrototype(left) {
  24650. var natives = [
  24651. "Array", "ArrayBuffer", "Boolean", "Collator", "DataView", "Date",
  24652. "DateTimeFormat", "Error", "EvalError", "Float32Array", "Float64Array",
  24653. "Function", "Infinity", "Intl", "Int16Array", "Int32Array", "Int8Array",
  24654. "Iterator", "Number", "NumberFormat", "Object", "RangeError",
  24655. "ReferenceError", "RegExp", "StopIteration", "String", "SyntaxError",
  24656. "TypeError", "Uint16Array", "Uint32Array", "Uint8Array", "Uint8ClampedArray",
  24657. "URIError"
  24658. ];
  24659. function walkPrototype(obj) {
  24660. if (typeof obj !== "object") return;
  24661. return obj.right === "prototype" ? obj : walkPrototype(obj.left);
  24662. }
  24663. function walkNative(obj) {
  24664. while (!obj.identifier && typeof obj.left === "object")
  24665. obj = obj.left;
  24666. if (obj.identifier && natives.indexOf(obj.value) >= 0 &&
  24667. state.funct["(scope)"].isPredefined(obj.value)) {
  24668. return obj.value;
  24669. }
  24670. }
  24671. var prototype = walkPrototype(left);
  24672. if (prototype) return walkNative(prototype);
  24673. }
  24674. /**
  24675. * Determine if the given token is a valid assignment target; emit errors
  24676. * and/or warnings as appropriate
  24677. *
  24678. * @param {number} context - the parsing context; see `prod-params.js` for
  24679. * more information
  24680. * @param {token} left - the left hand side of the assignment
  24681. * @param {token=} assignToken - the token for the assignment, used for
  24682. * reporting
  24683. * @param {object=} options - optional object
  24684. * @param {boolean} options.allowDestructuring - whether to allow
  24685. * destructuring binding
  24686. *
  24687. * @returns {boolean} Whether the left hand side is OK
  24688. */
  24689. function checkLeftSideAssign(context, left, assignToken, options) {
  24690. var allowDestructuring = options && options.allowDestructuring;
  24691. assignToken = assignToken || left;
  24692. if (state.option.freeze) {
  24693. var nativeObject = findNativePrototype(left);
  24694. if (nativeObject)
  24695. warning("W121", left, nativeObject);
  24696. }
  24697. if (left.identifier && !left.isMetaProperty) {
  24698. // The `reassign` method also calls `modify`, but we are specific in
  24699. // order to catch function re-assignment and globals re-assignment
  24700. state.funct["(scope)"].block.reassign(left.value, left);
  24701. }
  24702. if (left.id === ".") {
  24703. if (!left.left || left.left.value === "arguments" && !state.isStrict()) {
  24704. warning("W143", assignToken);
  24705. }
  24706. state.nameStack.set(state.tokens.prev);
  24707. return true;
  24708. } else if (left.id === "{" || left.id === "[") {
  24709. if (!allowDestructuring || !left.destructAssign) {
  24710. if (left.id === "{" || !left.left) {
  24711. warning("E031", assignToken);
  24712. } else if (left.left.value === "arguments" && !state.isStrict()) {
  24713. warning("W143", assignToken);
  24714. }
  24715. }
  24716. if (left.id === "[") {
  24717. state.nameStack.set(left.right);
  24718. }
  24719. return true;
  24720. } else if (left.identifier && !isReserved(context, left) && !left.isMetaProperty) {
  24721. if (state.funct["(scope)"].bindingtype(left.value) === "exception") {
  24722. warning("W022", left);
  24723. }
  24724. if (left.value === "eval" && state.isStrict()) {
  24725. error("E031", assignToken);
  24726. return false;
  24727. } else if (left.value === "arguments") {
  24728. if (!state.isStrict()) {
  24729. warning("W143", assignToken);
  24730. } else {
  24731. error("E031", assignToken);
  24732. return false;
  24733. }
  24734. }
  24735. state.nameStack.set(left);
  24736. return true;
  24737. }
  24738. error("E031", assignToken);
  24739. return false;
  24740. }
  24741. /**
  24742. * Convenience function for defining JSHint symbols for assignment operators.
  24743. *
  24744. * @param {string} s - the name of the symbol
  24745. * @param {function} [f] - a function to be invoked that consumes the
  24746. * right-hand side of the operator (see the `infix`
  24747. * function)
  24748. *
  24749. * @returns {object} - the object describing the JSHint symbol (provided to
  24750. * support cases where further refinement is necessary)
  24751. */
  24752. function assignop(s, f) {
  24753. var x = infix(s, typeof f === "function" ? f : function(context, left, that) {
  24754. that.left = left;
  24755. checkLeftSideAssign(context, left, that, { allowDestructuring: true });
  24756. that.right = expression(context, 10);
  24757. return that;
  24758. }, 20);
  24759. x.exps = true;
  24760. x.assign = true;
  24761. return x;
  24762. }
  24763. /**
  24764. * Convenience function for defining JSHint symbols for bitwise operators.
  24765. *
  24766. * @param {string} s - the name of the symbol
  24767. * @param {function} [f] - the left denotation function for the symbol; see
  24768. * the `expression` function for more detail
  24769. * @param {number} p - the left-binding power of the token as used by the
  24770. * Pratt parsing semantics
  24771. *
  24772. * @returns {object} - the object describing the JSHint symbol (provided to
  24773. * support cases where further refinement is necessary)
  24774. */
  24775. function bitwise(s, f, p) {
  24776. var x = symbol(s, p);
  24777. reserveName(x);
  24778. x.infix = true;
  24779. x.led = (typeof f === "function") ? f : function(context, left) {
  24780. if (state.option.bitwise) {
  24781. warning("W016", this, this.id);
  24782. }
  24783. this.left = left;
  24784. this.right = expression(context, p);
  24785. return this;
  24786. };
  24787. return x;
  24788. }
  24789. /**
  24790. * Convenience function for defining JSHint symbols for bitwise assignment
  24791. * operators. See the `assignop` function for more detail.
  24792. *
  24793. * @param {string} s - the name of the symbol
  24794. *
  24795. * @returns {object} - the object describing the JSHint symbol (provided to
  24796. * support cases where further refinement is necessary)
  24797. */
  24798. function bitwiseassignop(s) {
  24799. symbol(s, 20).exps = true;
  24800. return infix(s, function(context, left, that) {
  24801. if (state.option.bitwise) {
  24802. warning("W016", that, that.id);
  24803. }
  24804. checkLeftSideAssign(context, left, that);
  24805. that.right = expression(context, 10);
  24806. return that;
  24807. }, 20);
  24808. }
  24809. /**
  24810. * Convenience function for defining JSHint symbols for those operators which
  24811. * have a single operand that appears before them in the source code.
  24812. *
  24813. * @param {string} s - the name of the symbol
  24814. *
  24815. * @returns {object} - the object describing the JSHint symbol (provided to
  24816. * support cases where further refinement is necessary)
  24817. */
  24818. function suffix(s) {
  24819. var x = symbol(s, 150);
  24820. x.led = function(context, left) {
  24821. // this = suffix e.g. "++" punctuator
  24822. // left = symbol operated e.g. "a" identifier or "a.b" punctuator
  24823. if (state.option.plusplus) {
  24824. warning("W016", this, this.id);
  24825. }
  24826. checkLeftSideAssign(context, left, this);
  24827. this.left = left;
  24828. return this;
  24829. };
  24830. return x;
  24831. }
  24832. /**
  24833. * Retrieve the value of the next token if it is an identifier and optionally
  24834. * advance the parser.
  24835. *
  24836. * @param {number} context - the parsing context; see `prod-params.js` for
  24837. * more information
  24838. * @param {boolean} [isName] - `true` if an IdentifierName should be consumed
  24839. * (e.g. object properties)
  24840. * @param {boolean} [preserve] - `true` if the token should not be consumed
  24841. *
  24842. * @returns {string|undefined} - the value of the identifier, if present
  24843. */
  24844. function optionalidentifier(context, isName, preserve) {
  24845. if (!state.tokens.next.identifier) {
  24846. return;
  24847. }
  24848. if (!preserve) {
  24849. advance();
  24850. }
  24851. var curr = state.tokens.curr;
  24852. if (isReserved(context, curr) && !(isName && state.inES5())) {
  24853. warning("W024", state.tokens.curr, state.tokens.curr.id);
  24854. }
  24855. return curr.value;
  24856. }
  24857. /**
  24858. * Consume the "..." token which designates "spread" and "rest" operations if
  24859. * it is present. If the operator is repeated, consume every repetition, and
  24860. * issue a single error describing the syntax error.
  24861. *
  24862. * @param {string} operation - either "spread" or "rest"
  24863. *
  24864. * @returns {boolean} a value describing whether or not any tokens were
  24865. * consumed in this way
  24866. */
  24867. function spreadrest(operation) {
  24868. if (!checkPunctuator(state.tokens.next, "...")) {
  24869. return false;
  24870. }
  24871. if (!state.inES6(true)) {
  24872. warning("W119", state.tokens.next, operation + " operator", "6");
  24873. }
  24874. advance();
  24875. if (checkPunctuator(state.tokens.next, "...")) {
  24876. warning("E024", state.tokens.next, "...");
  24877. while (checkPunctuator(state.tokens.next, "...")) {
  24878. advance();
  24879. }
  24880. }
  24881. return true;
  24882. }
  24883. /**
  24884. * Ensure that the current token is an identifier and retrieve its value.
  24885. *
  24886. * @param {number} context - the parsing context; see `prod-params.js` for
  24887. * more information
  24888. * @param {boolean} [isName] - `true` if an IdentifierName should be consumed
  24889. * (e.g. object properties)
  24890. *
  24891. * @returns {string|undefined} - the value of the identifier, if present
  24892. */
  24893. function identifier(context, isName) {
  24894. var i = optionalidentifier(context, isName, false);
  24895. if (i) {
  24896. return i;
  24897. }
  24898. error("E030", state.tokens.next, state.tokens.next.value);
  24899. // The token should be consumed after a warning is issued so the parser
  24900. // can continue as though an identifier were found. The semicolon token
  24901. // should not be consumed in this way so that the parser interprets it as
  24902. // a statement delimiter;
  24903. if (state.tokens.next.id !== ";") {
  24904. advance();
  24905. }
  24906. }
  24907. /**
  24908. * Determine if the provided token may be evaluated and emit a linting
  24909. * warning if this is note the case.
  24910. *
  24911. * @param {token} controlToken
  24912. */
  24913. function reachable(controlToken) {
  24914. var i = 0, t;
  24915. if (state.tokens.next.id !== ";" || controlToken.inBracelessBlock) {
  24916. return;
  24917. }
  24918. for (;;) {
  24919. do {
  24920. t = peek(i);
  24921. i += 1;
  24922. } while (t.id !== "(end)" && t.id === "(comment)");
  24923. if (t.reach) {
  24924. return;
  24925. }
  24926. if (t.id !== "(endline)") {
  24927. if (t.id === "function") {
  24928. if (state.option.latedef === true) {
  24929. warning("W026", t);
  24930. }
  24931. break;
  24932. }
  24933. warning("W027", t, t.value, controlToken.value);
  24934. break;
  24935. }
  24936. }
  24937. }
  24938. /**
  24939. * Consume the semicolon that delimits the statement currently being parsed,
  24940. * emitting relevant warnings/errors as appropriate.
  24941. *
  24942. * @param {token} stmt - token describing the statement under consideration
  24943. */
  24944. function parseFinalSemicolon(stmt) {
  24945. if (state.tokens.next.id !== ";") {
  24946. // don't complain about unclosed templates / strings
  24947. if (state.tokens.next.isUnclosed) return advance();
  24948. var isSameLine = sameLine(state.tokens.curr, state.tokens.next) &&
  24949. state.tokens.next.id !== "(end)";
  24950. var blockEnd = checkPunctuator(state.tokens.next, "}");
  24951. if (isSameLine && !blockEnd && !(stmt.id === "do" && state.inES6(true))) {
  24952. errorAt("E058", state.tokens.curr.line, state.tokens.curr.character);
  24953. } else if (!state.option.asi) {
  24954. // If this is the last statement in a block that ends on the same line
  24955. // *and* option lastsemic is on, ignore the warning. Otherwise, issue
  24956. // a warning about missing semicolon.
  24957. if (!(blockEnd && isSameLine && state.option.lastsemic)) {
  24958. warningAt("W033", state.tokens.curr.line, state.tokens.curr.character);
  24959. }
  24960. }
  24961. } else {
  24962. advance(";");
  24963. }
  24964. }
  24965. /**
  24966. * Consume a statement.
  24967. *
  24968. * @param {number} context - the parsing context; see `prod-params.js` for
  24969. * more information
  24970. *
  24971. * @returns {token} - the token describing the statement
  24972. */
  24973. function statement(context) {
  24974. var i = indent, r, t = state.tokens.next, hasOwnScope = false;
  24975. context |= prodParams.initial;
  24976. if (t.id === ";") {
  24977. advance(";");
  24978. return;
  24979. }
  24980. // Is this a labelled statement?
  24981. var res = isReserved(context, t);
  24982. // We're being more tolerant here: if someone uses
  24983. // a FutureReservedWord (that is not meant to start a statement)
  24984. // as a label, we warn but proceed anyway.
  24985. if (res && t.meta && t.meta.isFutureReservedWord && !t.fud) {
  24986. warning("W024", t, t.id);
  24987. res = false;
  24988. }
  24989. if (t.identifier && !res && peek().id === ":") {
  24990. advance();
  24991. advance(":");
  24992. hasOwnScope = true;
  24993. state.funct["(scope)"].stack();
  24994. state.funct["(scope)"].block.addLabel(t.value, { token: state.tokens.curr });
  24995. if (!state.tokens.next.labelled && state.tokens.next.value !== "{") {
  24996. warning("W028", state.tokens.next, t.value, state.tokens.next.value);
  24997. }
  24998. t = state.tokens.next;
  24999. }
  25000. // Is it a lonely block?
  25001. if (t.id === "{") {
  25002. // Is it a switch case block?
  25003. //
  25004. // switch (foo) {
  25005. // case bar: { <= here.
  25006. // ...
  25007. // }
  25008. // }
  25009. var iscase = (state.funct["(verb)"] === "case" && state.tokens.curr.value === ":");
  25010. block(context, true, true, false, false, iscase);
  25011. if (hasOwnScope) {
  25012. state.funct["(scope)"].unstack();
  25013. }
  25014. return;
  25015. }
  25016. // Parse the statement.
  25017. r = expression(context, 0);
  25018. if (r && !(r.identifier && r.value === "function") &&
  25019. !(r.type === "(punctuator)" && r.left &&
  25020. r.left.identifier && r.left.value === "function")) {
  25021. if (!state.isStrict() && state.stmtMissingStrict()) {
  25022. warning("E007");
  25023. }
  25024. }
  25025. // Look for the final semicolon.
  25026. if (!t.block) {
  25027. if (!state.option.expr && (!r || !r.exps)) {
  25028. warning("W030", state.tokens.curr);
  25029. } else if (state.option.nonew && r && r.left && r.id === "(" && r.left.id === "new") {
  25030. warning("W031", t);
  25031. }
  25032. parseFinalSemicolon(t);
  25033. }
  25034. // Restore the indentation.
  25035. indent = i;
  25036. if (hasOwnScope) {
  25037. state.funct["(scope)"].unstack();
  25038. }
  25039. return r;
  25040. }
  25041. /**
  25042. * Consume a series of statements until encountering either the end of the
  25043. * program or a token that interrupts control flow.
  25044. *
  25045. * @param {number} context - the parsing context; see `prod-params.js` for
  25046. * more information
  25047. *
  25048. * @returns {Array<token>} - the tokens consumed
  25049. */
  25050. function statements(context) {
  25051. var a = [], p;
  25052. while (!state.tokens.next.reach && state.tokens.next.id !== "(end)") {
  25053. if (state.tokens.next.id === ";") {
  25054. p = peek();
  25055. if (!p || (p.id !== "(" && p.id !== "[")) {
  25056. warning("W032");
  25057. }
  25058. advance(";");
  25059. } else {
  25060. a.push(statement(context));
  25061. }
  25062. }
  25063. return a;
  25064. }
  25065. /**
  25066. * Parse any directives in a directive prologue.
  25067. */
  25068. function directives() {
  25069. var current = state.tokens.next;
  25070. while (state.tokens.next.id === "(string)") {
  25071. var next = peekIgnoreEOL();
  25072. if (!isEndOfExpr(0, current, next)) {
  25073. break;
  25074. }
  25075. current = next;
  25076. advance();
  25077. var directive = state.tokens.curr.value;
  25078. if (state.directive[directive] ||
  25079. (directive === "use strict" && state.option.strict === "implied")) {
  25080. warning("W034", state.tokens.curr, directive);
  25081. }
  25082. // From ECMAScript 2016:
  25083. //
  25084. // > 14.1.2 Static Semantics: Early Errors
  25085. // >
  25086. // > [...]
  25087. // > - It is a Syntax Error if ContainsUseStrict of FunctionBody is true
  25088. // > and IsSimpleParameterList of FormalParameters is false.
  25089. if (directive === "use strict" && state.inES7() &&
  25090. !state.funct["(global)"] && state.funct["(hasSimpleParams)"] === false) {
  25091. error("E065", state.tokens.curr);
  25092. }
  25093. state.directive[directive] = state.tokens.curr;
  25094. parseFinalSemicolon(current);
  25095. }
  25096. if (state.isStrict()) {
  25097. state.option.undef = true;
  25098. }
  25099. }
  25100. /**
  25101. * Parses a single block. A block is a sequence of statements wrapped in
  25102. * braces.
  25103. *
  25104. * @param {number} context - parsing context
  25105. * @param {boolean} ordinary - `true` for everything but function bodies and
  25106. * try blocks
  25107. * @param {boolean} [stmt] - `true` if block can be a single statement (e.g.
  25108. * in if/for/while)
  25109. * @param {boolean} [isfunc] - `true` if block is a function body
  25110. * @param {boolean} [isfatarrow] - `true` if its a body of a fat arrow
  25111. * function
  25112. * @param {boolean} [iscase] - `true` if block is a switch case block
  25113. *
  25114. * @returns {token} - the token describing the block
  25115. */
  25116. function block(context, ordinary, stmt, isfunc, isfatarrow, iscase) {
  25117. var a,
  25118. b = inblock,
  25119. old_indent = indent,
  25120. m,
  25121. t,
  25122. d;
  25123. inblock = ordinary;
  25124. t = state.tokens.next;
  25125. var metrics = state.funct["(metrics)"];
  25126. metrics.nestedBlockDepth += 1;
  25127. metrics.verifyMaxNestedBlockDepthPerFunction();
  25128. if (state.tokens.next.id === "{") {
  25129. advance("{");
  25130. // create a new block scope
  25131. state.funct["(scope)"].stack();
  25132. if (state.tokens.next.id !== "}") {
  25133. indent += state.option.indent;
  25134. while (!ordinary && state.tokens.next.from > indent) {
  25135. indent += state.option.indent;
  25136. }
  25137. if (isfunc) {
  25138. m = {};
  25139. for (d in state.directive) {
  25140. m[d] = state.directive[d];
  25141. }
  25142. directives();
  25143. state.funct["(isStrict)"] = state.isStrict();
  25144. if (state.option.strict && state.funct["(context)"]["(global)"]) {
  25145. if (!m["use strict"] && !state.isStrict()) {
  25146. warning("E007");
  25147. }
  25148. }
  25149. }
  25150. a = statements(context);
  25151. metrics.statementCount += a.length;
  25152. indent -= state.option.indent;
  25153. } else if (isfunc) {
  25154. // Ensure property is set for functions with empty bodies.
  25155. state.funct["(isStrict)"] = state.isStrict();
  25156. }
  25157. advance("}", t);
  25158. if (isfunc) {
  25159. state.funct["(scope)"].validateParams(isfatarrow);
  25160. if (m) {
  25161. state.directive = m;
  25162. }
  25163. }
  25164. state.funct["(scope)"].unstack();
  25165. indent = old_indent;
  25166. } else if (!ordinary) {
  25167. if (isfunc) {
  25168. state.funct["(scope)"].stack();
  25169. if (stmt && !isfatarrow && !state.inMoz()) {
  25170. error("W118", state.tokens.curr, "function closure expressions");
  25171. }
  25172. if (isfatarrow) {
  25173. state.funct["(scope)"].validateParams(true);
  25174. }
  25175. var expr = expression(context, 10);
  25176. if (state.option.noreturnawait && context & prodParams.async &&
  25177. expr.identifier && expr.value === "await") {
  25178. warning("W146", expr);
  25179. }
  25180. if (state.option.strict && state.funct["(context)"]["(global)"]) {
  25181. if (!state.isStrict()) {
  25182. warning("E007");
  25183. }
  25184. }
  25185. state.funct["(scope)"].unstack();
  25186. } else {
  25187. error("E021", state.tokens.next, "{", state.tokens.next.value);
  25188. }
  25189. } else {
  25190. state.funct["(scope)"].stack();
  25191. if (!stmt || state.option.curly) {
  25192. warning("W116", state.tokens.next, "{", state.tokens.next.value);
  25193. }
  25194. // JSHint observes Annex B of the ECMAScript specification by default,
  25195. // where function declarations are permitted in the statement positions
  25196. // of IfStatements.
  25197. var supportsFnDecl = state.funct["(verb)"] === "if" ||
  25198. state.tokens.curr.id === "else";
  25199. state.tokens.next.inBracelessBlock = true;
  25200. indent += state.option.indent;
  25201. // test indentation only if statement is in new line
  25202. a = [statement(context)];
  25203. indent -= state.option.indent;
  25204. if (a[0] && a[0].declaration &&
  25205. !(supportsFnDecl && a[0].id === "function")) {
  25206. error("E048", a[0], a[0].id[0].toUpperCase() + a[0].id.slice(1));
  25207. }
  25208. state.funct["(scope)"].unstack();
  25209. }
  25210. // Don't clear and let it propagate out if it is "break", "return" or
  25211. // similar in switch case
  25212. switch (state.funct["(verb)"]) {
  25213. case "break":
  25214. case "continue":
  25215. case "return":
  25216. case "throw":
  25217. if (iscase) {
  25218. break;
  25219. }
  25220. /* falls through */
  25221. default:
  25222. state.funct["(verb)"] = null;
  25223. }
  25224. inblock = b;
  25225. if (ordinary && state.option.noempty && (!a || a.length === 0)) {
  25226. warning("W035", state.tokens.prev);
  25227. }
  25228. metrics.nestedBlockDepth -= 1;
  25229. return a;
  25230. }
  25231. /**
  25232. * Update the global state which tracks all statically-identifiable property
  25233. * names, and emit a warning if the `members` linting directive is in use and
  25234. * does not include the given name.
  25235. *
  25236. * @param {string} m - the property name
  25237. */
  25238. function countMember(m) {
  25239. if (membersOnly && typeof membersOnly[m] !== "boolean") {
  25240. warning("W036", state.tokens.curr, m);
  25241. }
  25242. if (typeof member[m] === "number") {
  25243. member[m] += 1;
  25244. } else {
  25245. member[m] = 1;
  25246. }
  25247. }
  25248. // Build the syntax table by declaring the syntactic elements of the language.
  25249. type("(number)", function() {
  25250. if (state.tokens.next.id === ".") {
  25251. warning("W005", this);
  25252. }
  25253. return this;
  25254. });
  25255. type("(string)", function() {
  25256. return this;
  25257. });
  25258. state.syntax["(identifier)"] = {
  25259. type: "(identifier)",
  25260. lbp: 0,
  25261. identifier: true,
  25262. nud: function(context) {
  25263. var v = this.value;
  25264. // If this identifier is the lone parameter to a shorthand "fat arrow"
  25265. // function definition, i.e.
  25266. //
  25267. // x => x;
  25268. //
  25269. // ...it should not be considered as a variable in the current scope. It
  25270. // will be added to the scope of the new function when the next token is
  25271. // parsed, so it can be safely ignored for now.
  25272. var isLoneArrowParam = state.tokens.next.id === "=>";
  25273. if (isReserved(context, this)) {
  25274. warning("W024", this, v);
  25275. } else if (!isLoneArrowParam && !state.funct["(comparray)"].check(v)) {
  25276. state.funct["(scope)"].block.use(v, state.tokens.curr);
  25277. }
  25278. return this;
  25279. },
  25280. led: function() {
  25281. /* istanbul ignore next */
  25282. error("E033", state.tokens.next, state.tokens.next.value);
  25283. }
  25284. };
  25285. var baseTemplateSyntax = {
  25286. identifier: false,
  25287. template: true,
  25288. };
  25289. state.syntax["(template)"] = _.extend({
  25290. lbp: 155,
  25291. type: "(template)",
  25292. nud: doTemplateLiteral,
  25293. led: doTemplateLiteral,
  25294. noSubst: false
  25295. }, baseTemplateSyntax);
  25296. state.syntax["(template middle)"] = _.extend({
  25297. lbp: 0,
  25298. type: "(template middle)",
  25299. noSubst: false
  25300. }, baseTemplateSyntax);
  25301. state.syntax["(template tail)"] = _.extend({
  25302. lbp: 0,
  25303. type: "(template tail)",
  25304. tail: true,
  25305. noSubst: false
  25306. }, baseTemplateSyntax);
  25307. state.syntax["(no subst template)"] = _.extend({
  25308. lbp: 155,
  25309. type: "(template)",
  25310. nud: doTemplateLiteral,
  25311. led: doTemplateLiteral,
  25312. noSubst: true,
  25313. tail: true // mark as tail, since it's always the last component
  25314. }, baseTemplateSyntax);
  25315. type("(regexp)", function() {
  25316. return this;
  25317. });
  25318. // ECMAScript parser
  25319. delim("(endline)");
  25320. (function(x) {
  25321. x.line = x.from = 0;
  25322. })(delim("(begin)"));
  25323. delim("(end)").reach = true;
  25324. delim("(error)").reach = true;
  25325. delim("}").reach = true;
  25326. delim(")");
  25327. delim("]");
  25328. delim("\"").reach = true;
  25329. delim("'").reach = true;
  25330. delim(";");
  25331. delim(":").reach = true;
  25332. delim("#");
  25333. reserve("else");
  25334. reserve("case").reach = true;
  25335. reserve("catch");
  25336. reserve("default").reach = true;
  25337. reserve("finally");
  25338. reserve("true", function() { return this; });
  25339. reserve("false", function() { return this; });
  25340. reserve("null", function() { return this; });
  25341. reserve("this", function() {
  25342. if (state.isStrict() && !isMethod() &&
  25343. !state.option.validthis && ((state.funct["(statement)"] &&
  25344. state.funct["(name)"].charAt(0) > "Z") || state.funct["(global)"])) {
  25345. warning("W040", this);
  25346. }
  25347. return this;
  25348. });
  25349. (function(superSymbol) {
  25350. superSymbol.rbp = 161;
  25351. })(reserve("super", function() {
  25352. superNud.call(state.tokens.curr, this);
  25353. return this;
  25354. }));
  25355. assignop("=", "assign");
  25356. assignop("+=", "assignadd");
  25357. assignop("-=", "assignsub");
  25358. assignop("*=", "assignmult");
  25359. assignop("/=", "assigndiv").nud = function() {
  25360. /* istanbul ignore next */
  25361. error("E014");
  25362. };
  25363. assignop("%=", "assignmod");
  25364. assignop("**=", function(context, left, that) {
  25365. if (!state.inES7()) {
  25366. warning("W119", that, "Exponentiation operator", "7");
  25367. }
  25368. that.left = left;
  25369. checkLeftSideAssign(context, left, that);
  25370. that.right = expression(context, 10);
  25371. return that;
  25372. });
  25373. bitwiseassignop("&=");
  25374. bitwiseassignop("|=");
  25375. bitwiseassignop("^=");
  25376. bitwiseassignop("<<=");
  25377. bitwiseassignop(">>=");
  25378. bitwiseassignop(">>>=");
  25379. infix(",", function(context, left, that) {
  25380. if (state.option.nocomma) {
  25381. warning("W127", that);
  25382. }
  25383. that.left = left;
  25384. if (checkComma()) {
  25385. that.right = expression(context, 10);
  25386. } else {
  25387. that.right = null;
  25388. }
  25389. return that;
  25390. }, 10, true);
  25391. infix("?", function(context, left, that) {
  25392. increaseComplexityCount();
  25393. that.left = left;
  25394. that.right = expression(context & ~prodParams.noin, 10);
  25395. advance(":");
  25396. expression(context, 10);
  25397. return that;
  25398. }, 30);
  25399. infix("||", function(context, left, that) {
  25400. increaseComplexityCount();
  25401. that.left = left;
  25402. that.right = expression(context, 40);
  25403. return that;
  25404. }, 40);
  25405. var andPrecedence = 50;
  25406. infix("&&", function(context, left, that) {
  25407. increaseComplexityCount();
  25408. that.left = left;
  25409. that.right = expression(context, andPrecedence);
  25410. return that;
  25411. }, andPrecedence);
  25412. infix("??", function(context, left, that) {
  25413. if (!left.paren && (left.id === "||" || left.id === "&&")) {
  25414. error("E024", that, "??");
  25415. }
  25416. if (!state.inES11()) {
  25417. warning("W119", that, "nullish coalescing", "11");
  25418. }
  25419. increaseComplexityCount();
  25420. that.left = left;
  25421. var right = that.right = expression(context, 39);
  25422. if (!right) {
  25423. error("E024", state.tokens.next, state.tokens.next.id);
  25424. } else if (!right.paren && (right.id === "||" || right.id === "&&")) {
  25425. error("E024", that.right, that.right.id);
  25426. }
  25427. return that;
  25428. }, 39);
  25429. // The Exponentiation operator, introduced in ECMAScript 2016
  25430. //
  25431. // ExponentiationExpression[Yield] :
  25432. // UnaryExpression[?Yield]
  25433. // UpdateExpression[?Yield] ** ExponentiationExpression[?Yield]
  25434. infix("**", function(context, left, that) {
  25435. if (!state.inES7()) {
  25436. warning("W119", that, "Exponentiation operator", "7");
  25437. }
  25438. // Disallow UnaryExpressions which are not wrapped in parenthesis
  25439. if (!left.paren && beginsUnaryExpression(left)) {
  25440. error("E024", that, "**");
  25441. }
  25442. that.left = left;
  25443. that.right = expression(context, that.rbp);
  25444. return that;
  25445. }, 150);
  25446. state.syntax["**"].rbp = 140;
  25447. bitwise("|", "bitor", 70);
  25448. bitwise("^", "bitxor", 80);
  25449. bitwise("&", "bitand", 90);
  25450. relation("==", function(context, left, right) {
  25451. var eqnull = state.option.eqnull &&
  25452. ((left && left.value) === "null" || (right && right.value) === "null");
  25453. switch (true) {
  25454. case !eqnull && state.option.eqeqeq:
  25455. this.from = this.character;
  25456. warning("W116", this, "===", "==");
  25457. break;
  25458. /* istanbul ignore next */
  25459. case isTypoTypeof(right, left, state):
  25460. warning("W122", this, right.value);
  25461. break;
  25462. case isTypoTypeof(left, right, state):
  25463. warning("W122", this, left.value);
  25464. break;
  25465. }
  25466. return this;
  25467. });
  25468. relation("===", function(context, left, right) {
  25469. if (isTypoTypeof(right, left, state)) {
  25470. warning("W122", this, right.value);
  25471. } else if (isTypoTypeof(left, right, state)) {
  25472. /* istanbul ignore next */
  25473. warning("W122", this, left.value);
  25474. }
  25475. return this;
  25476. });
  25477. relation("!=", function(context, left, right) {
  25478. var eqnull = state.option.eqnull &&
  25479. ((left && left.value) === "null" || (right && right.value) === "null");
  25480. if (!eqnull && state.option.eqeqeq) {
  25481. this.from = this.character;
  25482. warning("W116", this, "!==", "!=");
  25483. } else if (isTypoTypeof(right, left, state)) {
  25484. /* istanbul ignore next */
  25485. warning("W122", this, right.value);
  25486. } else if (isTypoTypeof(left, right, state)) {
  25487. warning("W122", this, left.value);
  25488. }
  25489. return this;
  25490. });
  25491. relation("!==", function(context, left, right) {
  25492. if (isTypoTypeof(right, left, state)) {
  25493. warning("W122", this, right.value);
  25494. } else if (isTypoTypeof(left, right, state)) {
  25495. /* istanbul ignore next */
  25496. warning("W122", this, left.value);
  25497. }
  25498. return this;
  25499. });
  25500. relation("<");
  25501. relation(">");
  25502. relation("<=");
  25503. relation(">=");
  25504. bitwise("<<", "shiftleft", 120);
  25505. bitwise(">>", "shiftright", 120);
  25506. bitwise(">>>", "shiftrightunsigned", 120);
  25507. infix("in", "in", 120);
  25508. infix("instanceof", function(context, left, token) {
  25509. var right;
  25510. var scope = state.funct["(scope)"];
  25511. token.left = left;
  25512. token.right = right = expression(context, 120);
  25513. // This condition reflects a syntax error which will be reported by the
  25514. // `expression` function.
  25515. if (!right) {
  25516. return token;
  25517. }
  25518. if (right.id === "(number)" ||
  25519. right.id === "(string)" ||
  25520. right.value === "null" ||
  25521. (right.value === "undefined" && !scope.has("undefined")) ||
  25522. right.arity === "unary" ||
  25523. right.id === "{" ||
  25524. (right.id === "[" && !right.right) ||
  25525. right.id === "(regexp)" ||
  25526. (right.id === "(template)" && !right.tag)) {
  25527. error("E060");
  25528. }
  25529. if (right.id === "function") {
  25530. warning("W139");
  25531. }
  25532. return token;
  25533. }, 120);
  25534. infix("+", function(context, left, that) {
  25535. var next = state.tokens.next;
  25536. var right;
  25537. that.left = left;
  25538. that.right = right = expression(context, 130);
  25539. if (left && right && left.id === "(string)" && right.id === "(string)") {
  25540. left.value += right.value;
  25541. left.character = right.character;
  25542. if (!state.option.scripturl && reg.javascriptURL.test(left.value)) {
  25543. warning("W050", left);
  25544. }
  25545. return left;
  25546. }
  25547. if (next.id === "+" || next.id === "++") {
  25548. warning("W007", that.right);
  25549. }
  25550. return that;
  25551. }, 130);
  25552. prefix("+", function(context) {
  25553. var next = state.tokens.next;
  25554. this.arity = "unary";
  25555. this.right = expression(context, 150);
  25556. if (next.id === "+" || next.id === "++") {
  25557. warning("W007", this.right);
  25558. }
  25559. return this;
  25560. });
  25561. infix("-", function(context, left, that) {
  25562. var next = state.tokens.next;
  25563. that.left = left;
  25564. that.right = expression(context, 130);
  25565. if (next.id === "-" || next.id === "--") {
  25566. warning("W006", that.right);
  25567. }
  25568. return that;
  25569. }, 130);
  25570. prefix("-", function(context) {
  25571. var next = state.tokens.next;
  25572. this.arity = "unary";
  25573. this.right = expression(context, 150);
  25574. if (next.id === "-" || next.id === "--") {
  25575. warning("W006", this.right);
  25576. }
  25577. return this;
  25578. });
  25579. infix("*", "mult", 140);
  25580. infix("/", "div", 140);
  25581. infix("%", "mod", 140);
  25582. suffix("++");
  25583. prefix("++", "preinc");
  25584. state.syntax["++"].exps = true;
  25585. suffix("--");
  25586. prefix("--", "predec");
  25587. state.syntax["--"].exps = true;
  25588. prefix("delete", function(context) {
  25589. this.arity = "unary";
  25590. var p = expression(context, 150);
  25591. if (!p) {
  25592. return this;
  25593. }
  25594. if (p.id !== "." && p.id !== "[") {
  25595. warning("W051");
  25596. }
  25597. this.first = p;
  25598. // The `delete` operator accepts unresolvable references when not in strict
  25599. // mode, so the operand may be undefined.
  25600. if (p.identifier && !state.isStrict()) {
  25601. p.forgiveUndef = true;
  25602. }
  25603. return this;
  25604. }).exps = true;
  25605. prefix("~", function(context) {
  25606. if (state.option.bitwise) {
  25607. warning("W016", this, "~");
  25608. }
  25609. this.arity = "unary";
  25610. this.right = expression(context, 150);
  25611. return this;
  25612. });
  25613. infix("...");
  25614. prefix("!", function(context) {
  25615. this.arity = "unary";
  25616. this.right = expression(context, 150);
  25617. if (!this.right) { // '!' followed by nothing? Give up.
  25618. quit("E041", this);
  25619. }
  25620. if (bang[this.right.id] === true) {
  25621. warning("W018", this, "!");
  25622. }
  25623. return this;
  25624. });
  25625. prefix("typeof", function(context) {
  25626. this.arity = "unary";
  25627. var p = expression(context, 150);
  25628. this.first = this.right = p;
  25629. if (!p) { // 'typeof' followed by nothing? Give up.
  25630. quit("E041", this);
  25631. }
  25632. // The `typeof` operator accepts unresolvable references, so the operand
  25633. // may be undefined.
  25634. if (p.identifier) {
  25635. p.forgiveUndef = true;
  25636. }
  25637. return this;
  25638. });
  25639. prefix("new", function(context) {
  25640. var mp = metaProperty(context, "target", function() {
  25641. if (!state.inES6(true)) {
  25642. warning("W119", state.tokens.prev, "new.target", "6");
  25643. }
  25644. var inFunction, c = state.funct;
  25645. while (c) {
  25646. inFunction = !c["(global)"];
  25647. if (!c["(arrow)"]) { break; }
  25648. c = c["(context)"];
  25649. }
  25650. if (!inFunction) {
  25651. warning("W136", state.tokens.prev, "new.target");
  25652. }
  25653. });
  25654. if (mp) { return mp; }
  25655. var opening = state.tokens.next;
  25656. var c = expression(context, 155), i;
  25657. if (!c) {
  25658. return this;
  25659. }
  25660. if (!c.paren && c.rbp > 160) {
  25661. error("E024", opening, opening.value);
  25662. }
  25663. if (c.id !== "function") {
  25664. if (c.identifier) {
  25665. switch (c.value) {
  25666. case "Number":
  25667. case "String":
  25668. case "Boolean":
  25669. case "Math":
  25670. case "JSON":
  25671. warning("W053", state.tokens.prev, c.value);
  25672. break;
  25673. case "Symbol":
  25674. if (state.inES6()) {
  25675. warning("W053", state.tokens.prev, c.value);
  25676. }
  25677. break;
  25678. case "Function":
  25679. if (!state.option.evil) {
  25680. warning("W054");
  25681. }
  25682. break;
  25683. case "Date":
  25684. case "RegExp":
  25685. case "this":
  25686. break;
  25687. default:
  25688. i = c.value.substr(0, 1);
  25689. if (state.option.newcap && (i < "A" || i > "Z") &&
  25690. !state.funct["(scope)"].isPredefined(c.value)) {
  25691. warning("W055", state.tokens.curr);
  25692. }
  25693. }
  25694. } else {
  25695. if (c.id === "?." && !c.paren) {
  25696. error("E024", c, "?.");
  25697. } else if (c.id !== "." && c.id !== "[" && c.id !== "(") {
  25698. /* istanbul ignore next */
  25699. warning("W056", state.tokens.curr);
  25700. }
  25701. }
  25702. } else {
  25703. if (!state.option.supernew)
  25704. warning("W057", this);
  25705. }
  25706. if (state.tokens.next.id !== "(" && !state.option.supernew) {
  25707. warning("W058", state.tokens.curr, state.tokens.curr.value);
  25708. }
  25709. this.first = this.right = c;
  25710. return this;
  25711. });
  25712. state.syntax["new"].exps = true;
  25713. var classDeclaration = blockstmt("class", function(context) {
  25714. var className, classNameToken;
  25715. if (!state.inES6()) {
  25716. warning("W104", state.tokens.curr, "class", "6");
  25717. }
  25718. state.inClassBody = true;
  25719. // Class Declaration: 'class <Classname>'
  25720. if (state.tokens.next.identifier && state.tokens.next.value !== "extends") {
  25721. classNameToken = state.tokens.next;
  25722. className = classNameToken.value;
  25723. identifier(context);
  25724. // unintialized, so that the 'extends' clause is parsed while the class is in TDZ
  25725. state.funct["(scope)"].addbinding(className, {
  25726. type: "class",
  25727. initialized: false,
  25728. token: classNameToken
  25729. });
  25730. }
  25731. // Class Declaration: 'class <Classname> extends <Superclass>'
  25732. if (state.tokens.next.value === "extends") {
  25733. advance("extends");
  25734. expression(context, 0);
  25735. }
  25736. if (classNameToken) {
  25737. this.name = classNameToken;
  25738. state.funct["(scope)"].initialize(className);
  25739. } else {
  25740. this.name = null;
  25741. }
  25742. state.funct["(scope)"].stack();
  25743. classBody(this, context);
  25744. return this;
  25745. });
  25746. classDeclaration.exps = true;
  25747. classDeclaration.declaration = true;
  25748. /*
  25749. Class expression
  25750. The Block- and Expression- handling for "class" are almost identical, except for the ordering of steps.
  25751. In an expression:, the name should not be saved into the calling scope, but is still accessible inside the definition, so we open a new scope first, then save the name. We also mark it as used.
  25752. */
  25753. prefix("class", function(context) {
  25754. var className, classNameToken;
  25755. if (!state.inES6()) {
  25756. warning("W104", state.tokens.curr, "class", "6");
  25757. }
  25758. state.inClassBody = true;
  25759. // Class Declaration: 'class <Classname>'
  25760. if (state.tokens.next.identifier && state.tokens.next.value !== "extends") {
  25761. classNameToken = state.tokens.next;
  25762. className = classNameToken.value;
  25763. identifier(context);
  25764. }
  25765. // Class Declaration: 'class <Classname> extends <Superclass>'
  25766. if (state.tokens.next.value === "extends") {
  25767. advance("extends");
  25768. expression(context, 0);
  25769. }
  25770. state.funct["(scope)"].stack();
  25771. if (classNameToken) {
  25772. this.name = classNameToken;
  25773. state.funct["(scope)"].addbinding(className, {
  25774. type: "class",
  25775. initialized: true,
  25776. token: classNameToken
  25777. });
  25778. state.funct["(scope)"].block.use(className, classNameToken);
  25779. } else {
  25780. this.name = null;
  25781. }
  25782. classBody(this, context);
  25783. return this;
  25784. });
  25785. function classBody(classToken, context) {
  25786. var props = Object.create(null);
  25787. var name, accessorType, token, isStatic, inGenerator, hasConstructor;
  25788. /* istanbul ignore else */
  25789. if (state.tokens.next.value === "{") {
  25790. advance("{");
  25791. } else {
  25792. warning("W116", state.tokens.curr, "identifier", state.tokens.next.type); //?
  25793. advance();
  25794. }
  25795. while (state.tokens.next.value !== "}") {
  25796. isStatic = false;
  25797. inGenerator = false;
  25798. context &= ~prodParams.preAsync;
  25799. if (state.tokens.next.value === "static" &&
  25800. !checkPunctuator(peek(), "(")) {
  25801. isStatic = true;
  25802. advance();
  25803. }
  25804. if (state.tokens.next.value === "async") {
  25805. if (!checkPunctuator(peek(), "(")) {
  25806. context |= prodParams.preAsync;
  25807. advance();
  25808. nolinebreak(state.tokens.curr);
  25809. if (checkPunctuator(state.tokens.next, "*")) {
  25810. inGenerator = true;
  25811. advance("*");
  25812. if (!state.inES9()) {
  25813. warning("W119", state.tokens.next, "async generators", "9");
  25814. }
  25815. }
  25816. if (!state.inES8()) {
  25817. warning("W119", state.tokens.curr, "async functions", "8");
  25818. }
  25819. }
  25820. }
  25821. if (state.tokens.next.value === "*") {
  25822. inGenerator = true;
  25823. advance();
  25824. }
  25825. token = state.tokens.next;
  25826. if ((token.value === "set" || token.value === "get") && !checkPunctuator(peek(), "(")) {
  25827. if (inGenerator) {
  25828. /* istanbul ignore next */
  25829. error("E024", token, token.value);
  25830. }
  25831. accessorType = token.value;
  25832. advance();
  25833. token = state.tokens.next;
  25834. if (!isStatic && token.value === "constructor") {
  25835. error("E049", token, "class " + accessorType + "ter method", token.value);
  25836. } else if (isStatic && token.value === "prototype") {
  25837. error("E049", token, "static class " + accessorType + "ter method", token.value);
  25838. }
  25839. } else {
  25840. accessorType = null;
  25841. }
  25842. switch (token.value) {
  25843. case ";":
  25844. warning("W032", token);
  25845. advance();
  25846. break;
  25847. case "constructor":
  25848. if (isStatic) {
  25849. // treat like a regular method -- static methods can be called 'constructor'
  25850. name = propertyName(context);
  25851. saveProperty(props, name, token, true, isStatic);
  25852. doMethod(classToken, context, name, inGenerator);
  25853. } else {
  25854. if (inGenerator || context & prodParams.preAsync) {
  25855. error("E024", token, token.value);
  25856. } else if (hasConstructor) {
  25857. /* istanbul ignore next */
  25858. error("E024", token, token.value);
  25859. } else {
  25860. hasConstructor = !accessorType && !isStatic;
  25861. }
  25862. advance();
  25863. doMethod(classToken, context, state.nameStack.infer());
  25864. }
  25865. break;
  25866. case "[":
  25867. name = computedPropertyName(context);
  25868. doMethod(classToken, context, name, inGenerator);
  25869. // We don't check names (via calling saveProperty()) of computed expressions like ["Symbol.iterator"]()
  25870. break;
  25871. default:
  25872. name = propertyName(context);
  25873. if (name === undefined) {
  25874. error("E024", token, token.value);
  25875. advance();
  25876. break;
  25877. }
  25878. if (accessorType) {
  25879. saveAccessor(accessorType, props, name, token, true, isStatic);
  25880. name = state.nameStack.infer();
  25881. } else {
  25882. if (isStatic && name === "prototype") {
  25883. error("E049", token, "static class method", name);
  25884. }
  25885. saveProperty(props, name, token, true, isStatic);
  25886. }
  25887. doMethod(classToken, context, name, inGenerator);
  25888. break;
  25889. }
  25890. }
  25891. advance("}");
  25892. checkProperties(props);
  25893. state.inClassBody = false;
  25894. state.funct["(scope)"].unstack();
  25895. }
  25896. function doMethod(classToken, context, name, generator) {
  25897. if (generator) {
  25898. if (!state.inES6()) {
  25899. warning("W119", state.tokens.curr, "function*", "6");
  25900. }
  25901. }
  25902. if (state.tokens.next.value !== "(") {
  25903. error("E054", state.tokens.next, state.tokens.next.value);
  25904. advance();
  25905. if (state.tokens.next.value === "{") {
  25906. // manually cheating the test "invalidClasses", which asserts this particular behavior when a class is misdefined.
  25907. advance();
  25908. if (state.tokens.next.value === "}") {
  25909. warning("W116", state.tokens.next, "(", state.tokens.next.value);
  25910. advance();
  25911. identifier(context);
  25912. advance();
  25913. }
  25914. /* istanbul ignore next */
  25915. return;
  25916. } else {
  25917. while (state.tokens.next.value !== "(") {
  25918. advance();
  25919. }
  25920. }
  25921. }
  25922. doFunction(context, { name: name,
  25923. type: generator ? "generator" : null,
  25924. isMethod: true,
  25925. statement: classToken });
  25926. }
  25927. prefix("void").exps = true;
  25928. infix(".", function(context, left, that) {
  25929. var m = identifier(context, true);
  25930. if (typeof m === "string") {
  25931. countMember(m);
  25932. }
  25933. that.left = left;
  25934. that.right = m;
  25935. if (m && m === "hasOwnProperty" && state.tokens.next.value === "=") {
  25936. warning("W001");
  25937. }
  25938. if (left && left.value === "arguments" && (m === "callee" || m === "caller")) {
  25939. if (state.option.noarg)
  25940. warning("W059", left, m);
  25941. else if (state.isStrict())
  25942. error("E008");
  25943. } else if (!state.option.evil && left && left.value === "document" &&
  25944. (m === "write" || m === "writeln")) {
  25945. warning("W060", left);
  25946. }
  25947. if (!state.option.evil && (m === "eval" || m === "execScript")) {
  25948. if (isGlobalEval(left, state)) {
  25949. warning("W061");
  25950. }
  25951. }
  25952. return that;
  25953. }, 160, true);
  25954. infix("?.", function(context, left, that) {
  25955. if (!state.inES11()) {
  25956. warning("W119", state.tokens.curr, "Optional chaining", "11");
  25957. }
  25958. if (checkPunctuator(state.tokens.next, "[")) {
  25959. that.left = left;
  25960. advance();
  25961. that.right = state.tokens.curr.led(context, left);
  25962. } else if (checkPunctuator(state.tokens.next, "(")) {
  25963. that.left = left;
  25964. advance();
  25965. that.right = state.tokens.curr.led(context, left);
  25966. that.exps = true;
  25967. } else {
  25968. state.syntax["."].led.call(that, context, left);
  25969. }
  25970. if (state.tokens.next.type === "(template)") {
  25971. error("E024", state.tokens.next, "`");
  25972. }
  25973. return that;
  25974. }, 160, true);
  25975. /**
  25976. * Determine if a CallExpression's "base" is a type of expression commonly
  25977. * used in this position.
  25978. *
  25979. * @param {token} token - token describing the "base" of the CallExpression
  25980. * @returns {boolean}
  25981. */
  25982. function isTypicalCallExpression(token) {
  25983. return token.identifier || token.id === "." || token.id === "[" ||
  25984. token.id === "=>" || token.id === "(" || token.id === "&&" ||
  25985. token.id === "||" || token.id === "?" || token.id === "async" ||
  25986. token.id === "?." || (state.inES6() && token["(name)"]);
  25987. }
  25988. infix("(", function(context, left, that) {
  25989. if (state.option.immed && left && !left.immed && left.id === "function") {
  25990. warning("W062");
  25991. }
  25992. if (state.option.asi && checkPunctuators(state.tokens.prev, [")", "]"]) &&
  25993. !sameLine(state.tokens.prev, state.tokens.curr)) {
  25994. warning("W014", state.tokens.curr, state.tokens.curr.id);
  25995. }
  25996. var n = 0;
  25997. var p = [];
  25998. if (left) {
  25999. if (left.type === "(identifier)") {
  26000. var newcapRe = /^[A-Z]([A-Z0-9_$]*[a-z][A-Za-z0-9_$]*)?$/;
  26001. var newcapIgnore = [
  26002. "Array", "Boolean", "Date", "Error", "Function", "Number",
  26003. "Object", "RegExp", "String", "Symbol"
  26004. ];
  26005. if (newcapRe.test(left.value) && newcapIgnore.indexOf(left.value) === -1) {
  26006. if (left.value === "Math") {
  26007. /* istanbul ignore next */
  26008. warning("W063", left);
  26009. } else if (state.option.newcap) {
  26010. warning("W064", left);
  26011. }
  26012. }
  26013. }
  26014. }
  26015. if (state.tokens.next.id !== ")") {
  26016. for (;;) {
  26017. spreadrest("spread");
  26018. p[p.length] = expression(context, 10);
  26019. n += 1;
  26020. if (state.tokens.next.id !== ",") {
  26021. break;
  26022. }
  26023. advance(",");
  26024. checkComma({ allowTrailing: true });
  26025. if (state.tokens.next.id === ")") {
  26026. if (!state.inES8()) {
  26027. warning("W119", state.tokens.curr, "Trailing comma in arguments lists", "8");
  26028. }
  26029. break;
  26030. }
  26031. }
  26032. }
  26033. advance(")");
  26034. if (typeof left === "object") {
  26035. if (!state.inES5() && left.value === "parseInt" && n === 1) {
  26036. warning("W065", state.tokens.curr);
  26037. }
  26038. if (!state.option.evil) {
  26039. if (left.value === "eval" || left.value === "Function" ||
  26040. left.value === "execScript") {
  26041. warning("W061", left);
  26042. // This conditional expression was initially implemented with a typo
  26043. // which prevented the branch's execution in all cases. While
  26044. // enabling the code will produce behavior that is consistent with
  26045. // the other forms of code evaluation that follow, such a change is
  26046. // also technically incompatable with prior versions of JSHint (due
  26047. // to the fact that the behavior was never formally documented). This
  26048. // branch should be enabled as part of a major release.
  26049. //if (p[0] && p[0].id === "(string)") {
  26050. // addEvalCode(left, p[0]);
  26051. //}
  26052. } else if (p[0] && p[0].id === "(string)" &&
  26053. (left.value === "setTimeout" ||
  26054. left.value === "setInterval")) {
  26055. warning("W066", left);
  26056. addEvalCode(left, p[0]);
  26057. // window.setTimeout/setInterval
  26058. } else if (p[0] && p[0].id === "(string)" &&
  26059. left.value === "." &&
  26060. left.left.value === "window" &&
  26061. (left.right === "setTimeout" ||
  26062. left.right === "setInterval")) {
  26063. warning("W066", left);
  26064. addEvalCode(left, p[0]);
  26065. }
  26066. }
  26067. if (!isTypicalCallExpression(left)) {
  26068. warning("W067", that);
  26069. }
  26070. }
  26071. that.left = left;
  26072. return that;
  26073. }, 155, true).exps = true;
  26074. function peekThroughParens(parens) {
  26075. var pn = state.tokens.next;
  26076. var i = -1;
  26077. var pn1;
  26078. do {
  26079. if (pn.value === "(") {
  26080. parens += 1;
  26081. } else if (pn.value === ")") {
  26082. parens -= 1;
  26083. }
  26084. i += 1;
  26085. pn1 = pn;
  26086. pn = peek(i);
  26087. } while (!(parens === 0 && pn1.value === ")") && pn.type !== "(end)");
  26088. return pn;
  26089. }
  26090. prefix("(", function(context, rbp) {
  26091. var ret, triggerFnExpr, first, last;
  26092. var opening = state.tokens.curr;
  26093. var preceeding = state.tokens.prev;
  26094. var isNecessary = !state.option.singleGroups;
  26095. var pn = peekThroughParens(1);
  26096. if (state.tokens.next.id === "function") {
  26097. triggerFnExpr = state.tokens.next.immed = true;
  26098. }
  26099. // If the balanced grouping operator is followed by a "fat arrow", the
  26100. // current token marks the beginning of a "fat arrow" function and parsing
  26101. // should proceed accordingly.
  26102. if (pn.value === "=>") {
  26103. pn.funct = doFunction(context, { type: "arrow", parsedOpening: true });
  26104. return pn;
  26105. }
  26106. // The ECMA262 grammar requires an expression between the "opening
  26107. // parenthesis" and "close parenthesis" tokens of the grouping operator.
  26108. // However, the "ignore" directive is commonly used to inject values that
  26109. // are not included in the token stream. For example:
  26110. //
  26111. // return (
  26112. // /*jshint ignore:start */
  26113. // <div></div>
  26114. // /*jshint ignore:end */
  26115. // );
  26116. //
  26117. // The "empty" grouping operator is permitted in order to tolerate this
  26118. // pattern.
  26119. if (state.tokens.next.id === ")") {
  26120. advance(")");
  26121. return;
  26122. }
  26123. ret = expression(context, 0);
  26124. advance(")", this);
  26125. if (!ret) {
  26126. return;
  26127. }
  26128. ret.paren = true;
  26129. if (state.option.immed && ret && ret.id === "function") {
  26130. if (state.tokens.next.id !== "(" &&
  26131. state.tokens.next.id !== "." && state.tokens.next.id !== "[") {
  26132. warning("W068", this);
  26133. }
  26134. }
  26135. if (ret.id === ",") {
  26136. first = ret.left;
  26137. while (first.id === ",") {
  26138. first = first.left;
  26139. }
  26140. last = ret.right;
  26141. } else {
  26142. first = last = ret;
  26143. if (!isNecessary) {
  26144. // async functions are identified after parsing due to the complexity
  26145. // of disambiguating the `async` keyword.
  26146. if (!triggerFnExpr) {
  26147. triggerFnExpr = ret.id === "async";
  26148. }
  26149. isNecessary =
  26150. // Used to distinguish from an ExpressionStatement which may not
  26151. // begin with the `{` and `function` tokens
  26152. (opening.beginsStmt && (ret.id === "{" || triggerFnExpr)) ||
  26153. // Used to signal that a function expression is being supplied to
  26154. // some other operator.
  26155. (triggerFnExpr &&
  26156. // For parenthesis wrapping a function expression to be considered
  26157. // necessary, the grouping operator should be the left-hand-side of
  26158. // some other operator--either within the parenthesis or directly
  26159. // following them.
  26160. (!isEndOfExpr() || state.tokens.prev.id !== "}")) ||
  26161. // Used to demarcate an arrow function as the left-hand side of some
  26162. // operator.
  26163. (ret.id === "=>" && !isEndOfExpr()) ||
  26164. // Used as the return value of a single-statement arrow function
  26165. (ret.id === "{" && preceeding.id === "=>") ||
  26166. // Used to cover a unary expression as the left-hand side of the
  26167. // exponentiation operator
  26168. (beginsUnaryExpression(ret) && state.tokens.next.id === "**") ||
  26169. // Used to cover a logical operator as the right-hand side of the
  26170. // nullish coalescing operator
  26171. (preceeding.id === "??" && (ret.id === "&&" || ret.id === "||")) ||
  26172. // Used to delineate an integer number literal from a dereferencing
  26173. // punctuator (otherwise interpreted as a decimal point)
  26174. (ret.type === "(number)" &&
  26175. checkPunctuator(pn, ".") && /^\d+$/.test(ret.value)) ||
  26176. // Used to wrap object destructuring assignment
  26177. (opening.beginsStmt && ret.id === "=" && ret.left.id === "{") ||
  26178. // Used to allow optional chaining with other language features which
  26179. // are otherwise restricted.
  26180. (ret.id === "?." &&
  26181. (preceeding.id === "new" || state.tokens.next.type === "(template)"));
  26182. }
  26183. }
  26184. // The operator may be necessary to override the default binding power of
  26185. // neighboring operators (whenever there is an operator in use within the
  26186. // first expression *or* the current group contains multiple expressions)
  26187. if (!isNecessary && (isOperator(first) || first !== last)) {
  26188. isNecessary =
  26189. (rbp > first.lbp) ||
  26190. (rbp > 0 && rbp === first.lbp) ||
  26191. (!isEndOfExpr() && last.rbp < state.tokens.next.lbp);
  26192. }
  26193. if (!isNecessary) {
  26194. warning("W126", opening);
  26195. }
  26196. return ret;
  26197. });
  26198. application("=>").rbp = 161;
  26199. infix("[", function(context, left, that) {
  26200. var e, s, canUseDot;
  26201. if (state.option.asi && checkPunctuators(state.tokens.prev, [")", "]"]) &&
  26202. !sameLine(state.tokens.prev, state.tokens.curr)) {
  26203. warning("W014", state.tokens.curr, state.tokens.curr.id);
  26204. }
  26205. e = expression(context & ~prodParams.noin, 0);
  26206. if (e && e.type === "(string)") {
  26207. if (!state.option.evil && (e.value === "eval" || e.value === "execScript")) {
  26208. if (isGlobalEval(left, state)) {
  26209. warning("W061");
  26210. }
  26211. }
  26212. countMember(e.value);
  26213. if (!state.option.sub && reg.identifier.test(e.value)) {
  26214. s = state.syntax[e.value];
  26215. if (s) {
  26216. canUseDot = !isReserved(context, s);
  26217. } else {
  26218. // This branch exists to preserve legacy behavior with version 2.9.5
  26219. // and earlier. In those releases, `eval` and `arguments` were
  26220. // incorrectly interpreted as reserved keywords, so Member
  26221. // Expressions such as `object["eval"]` did not trigger warning W069.
  26222. //
  26223. // TODO: Remove in JSHint 3
  26224. canUseDot = e.value !== "eval" && e.value !== "arguments";
  26225. }
  26226. if (canUseDot) {
  26227. warning("W069", state.tokens.prev, e.value);
  26228. }
  26229. }
  26230. }
  26231. advance("]", that);
  26232. if (e && e.value === "hasOwnProperty" && state.tokens.next.value === "=") {
  26233. warning("W001");
  26234. }
  26235. that.left = left;
  26236. that.right = e;
  26237. return that;
  26238. }, 160, true);
  26239. function comprehensiveArrayExpression(context) {
  26240. var res = {};
  26241. res.exps = true;
  26242. state.funct["(comparray)"].stack();
  26243. // Handle reversed for expressions, used in spidermonkey
  26244. var reversed = false;
  26245. if (state.tokens.next.value !== "for") {
  26246. reversed = true;
  26247. if (!state.inMoz()) {
  26248. warning("W116", state.tokens.next, "for", state.tokens.next.value);
  26249. }
  26250. state.funct["(comparray)"].setState("use");
  26251. res.right = expression(context, 10);
  26252. }
  26253. advance("for");
  26254. if (state.tokens.next.value === "each") {
  26255. advance("each");
  26256. if (!state.inMoz()) {
  26257. warning("W118", state.tokens.curr, "for each");
  26258. }
  26259. }
  26260. advance("(");
  26261. state.funct["(comparray)"].setState("define");
  26262. res.left = expression(context, 130);
  26263. if (_.includes(["in", "of"], state.tokens.next.value)) {
  26264. advance();
  26265. } else {
  26266. /* istanbul ignore next */
  26267. error("E045", state.tokens.curr);
  26268. }
  26269. state.funct["(comparray)"].setState("generate");
  26270. expression(context, 10);
  26271. advance(")");
  26272. if (state.tokens.next.value === "if") {
  26273. advance("if");
  26274. advance("(");
  26275. state.funct["(comparray)"].setState("filter");
  26276. expression(context, 10);
  26277. advance(")");
  26278. }
  26279. if (!reversed) {
  26280. state.funct["(comparray)"].setState("use");
  26281. res.right = expression(context, 10);
  26282. }
  26283. advance("]");
  26284. state.funct["(comparray)"].unstack();
  26285. return res;
  26286. }
  26287. prefix("[", function(context) {
  26288. var blocktype = lookupBlockType();
  26289. if (blocktype.isCompArray) {
  26290. if (!state.option.esnext && !state.inMoz()) {
  26291. warning("W118", state.tokens.curr, "array comprehension");
  26292. }
  26293. return comprehensiveArrayExpression(context);
  26294. } else if (blocktype.isDestAssign) {
  26295. this.destructAssign = destructuringPattern(context, {
  26296. openingParsed: true,
  26297. assignment: true
  26298. });
  26299. return this;
  26300. }
  26301. var b = !sameLine(state.tokens.curr, state.tokens.next);
  26302. this.first = [];
  26303. if (b) {
  26304. indent += state.option.indent;
  26305. if (state.tokens.next.from === indent + state.option.indent) {
  26306. /* istanbul ignore next */
  26307. indent += state.option.indent;
  26308. }
  26309. }
  26310. while (state.tokens.next.id !== "(end)") {
  26311. while (state.tokens.next.id === ",") {
  26312. if (!state.option.elision) {
  26313. if (!state.inES5()) {
  26314. // Maintain compat with old options --- ES5 mode without
  26315. // elision=true will warn once per comma
  26316. warning("W070");
  26317. } else {
  26318. warning("W128");
  26319. do {
  26320. advance(",");
  26321. } while (state.tokens.next.id === ",");
  26322. continue;
  26323. }
  26324. }
  26325. advance(",");
  26326. }
  26327. if (state.tokens.next.id === "]") {
  26328. break;
  26329. }
  26330. spreadrest("spread");
  26331. this.first.push(expression(context, 10));
  26332. if (state.tokens.next.id === ",") {
  26333. advance(",");
  26334. checkComma({ allowTrailing: true });
  26335. if (state.tokens.next.id === "]" && !state.inES5()) {
  26336. warning("W070", state.tokens.curr);
  26337. break;
  26338. }
  26339. } else {
  26340. if (state.option.trailingcomma && state.inES5()) {
  26341. warningAt("W140", state.tokens.curr.line, state.tokens.curr.character);
  26342. }
  26343. break;
  26344. }
  26345. }
  26346. if (b) {
  26347. indent -= state.option.indent;
  26348. }
  26349. advance("]", this);
  26350. return this;
  26351. });
  26352. function isMethod() {
  26353. return !!state.funct["(method)"];
  26354. }
  26355. /**
  26356. * Retrieve the value of the next token if it is a valid LiteralPropertyName
  26357. * and optionally advance the parser.
  26358. *
  26359. * @param {number} context - the parsing context; see `prod-params.js` for
  26360. * more information
  26361. *
  26362. * @returns {string|undefined} - the value of the identifier, if present
  26363. */
  26364. function propertyName(context) {
  26365. var id = optionalidentifier(context, true);
  26366. if (!id) {
  26367. if (state.tokens.next.id === "(string)") {
  26368. id = state.tokens.next.value;
  26369. advance();
  26370. } else if (state.tokens.next.id === "(number)") {
  26371. id = state.tokens.next.value.toString();
  26372. advance();
  26373. }
  26374. }
  26375. if (id === "hasOwnProperty") {
  26376. warning("W001");
  26377. }
  26378. return id;
  26379. }
  26380. /**
  26381. * @param {Number} context The parsing context
  26382. * @param {Object} [options]
  26383. * @param {token} [options.loneArg] The argument to the function in cases
  26384. * where it was defined using the
  26385. * single-argument shorthand.
  26386. * @param {bool} [options.parsedOpening] Whether the opening parenthesis has
  26387. * already been parsed.
  26388. *
  26389. * @returns {{ arity: number, params: Array.<string>, isSimple: boolean }}
  26390. */
  26391. function functionparams(context, options) {
  26392. var next;
  26393. var paramsIds = [];
  26394. var ident;
  26395. var tokens = [];
  26396. var t;
  26397. var pastDefault = false;
  26398. var pastRest = false;
  26399. var arity = 0;
  26400. var loneArg = options && options.loneArg;
  26401. var hasDestructuring = false;
  26402. if (loneArg && loneArg.identifier === true) {
  26403. state.funct["(scope)"].addParam(loneArg.value, loneArg);
  26404. return { arity: 1, params: [ loneArg.value ], isSimple: true };
  26405. }
  26406. next = state.tokens.next;
  26407. if (!options || !options.parsedOpening) {
  26408. advance("(");
  26409. }
  26410. if (state.tokens.next.id === ")") {
  26411. advance(")");
  26412. return;
  26413. }
  26414. function addParam(addParamArgs) {
  26415. state.funct["(scope)"].addParam.apply(state.funct["(scope)"], addParamArgs);
  26416. }
  26417. for (;;) {
  26418. arity++;
  26419. // are added to the param scope
  26420. var currentParams = [];
  26421. pastRest = spreadrest("rest");
  26422. if (_.includes(["{", "["], state.tokens.next.id)) {
  26423. hasDestructuring = true;
  26424. tokens = destructuringPattern(context);
  26425. for (t in tokens) {
  26426. t = tokens[t];
  26427. if (t.id) {
  26428. paramsIds.push(t.id);
  26429. currentParams.push([t.id, t.token]);
  26430. }
  26431. }
  26432. } else {
  26433. ident = identifier(context);
  26434. if (ident) {
  26435. paramsIds.push(ident);
  26436. currentParams.push([ident, state.tokens.curr]);
  26437. } else {
  26438. // Skip invalid parameter.
  26439. while (!checkPunctuators(state.tokens.next, [",", ")"])) advance();
  26440. }
  26441. }
  26442. // It is valid to have a regular argument after a default argument
  26443. // since undefined can be used for missing parameters. Still warn as it is
  26444. // a possible code smell.
  26445. if (pastDefault) {
  26446. if (state.tokens.next.id !== "=") {
  26447. error("W138", state.tokens.curr);
  26448. }
  26449. }
  26450. if (state.tokens.next.id === "=") {
  26451. if (!state.inES6()) {
  26452. warning("W119", state.tokens.next, "default parameters", "6");
  26453. }
  26454. if (pastRest) {
  26455. error("E062", state.tokens.next);
  26456. }
  26457. advance("=");
  26458. pastDefault = true;
  26459. expression(context, 10);
  26460. }
  26461. // now we have evaluated the default expression, add the variable to the param scope
  26462. currentParams.forEach(addParam);
  26463. if (state.tokens.next.id === ",") {
  26464. if (pastRest) {
  26465. warning("W131", state.tokens.next);
  26466. }
  26467. advance(",");
  26468. checkComma({ allowTrailing: true });
  26469. }
  26470. if (state.tokens.next.id === ")") {
  26471. if (state.tokens.curr.id === "," && !state.inES8()) {
  26472. warning("W119", state.tokens.curr, "Trailing comma in function parameters", "8");
  26473. }
  26474. advance(")", next);
  26475. return {
  26476. arity: arity,
  26477. params: paramsIds,
  26478. isSimple: !hasDestructuring && !pastRest && !pastDefault
  26479. };
  26480. }
  26481. }
  26482. }
  26483. /**
  26484. * Factory function for creating objects used to track statistics of function
  26485. * literals.
  26486. *
  26487. * @param {string} name - the identifier name to associate with the function
  26488. * @param {object} [token] - token responsible for creating the function
  26489. * object
  26490. * @param {object} [overwrites] - a collection of properties that should
  26491. * override the corresponding default value of
  26492. * the new "functor" object
  26493. */
  26494. function functor(name, token, overwrites) {
  26495. var funct = {
  26496. "(name)" : name,
  26497. "(breakage)" : 0,
  26498. "(loopage)" : 0,
  26499. // The strictness of the function body is tracked via a dedicated
  26500. // property (as opposed to via the global `state` object) so that the
  26501. // value can be referenced after the body has been fully parsed (i.e.
  26502. // when validating the identifier used in function declarations and
  26503. // function expressions).
  26504. "(isStrict)" : "unknown",
  26505. "(global)" : false,
  26506. "(line)" : null,
  26507. "(character)" : null,
  26508. "(metrics)" : null,
  26509. "(statement)" : null,
  26510. "(context)" : null,
  26511. "(scope)" : null,
  26512. "(comparray)" : null,
  26513. "(yielded)" : null,
  26514. "(arrow)" : null,
  26515. "(async)" : null,
  26516. "(params)" : null
  26517. };
  26518. if (token) {
  26519. _.extend(funct, {
  26520. "(line)" : token.line,
  26521. "(character)": token.character,
  26522. "(metrics)" : createMetrics(token)
  26523. });
  26524. }
  26525. _.extend(funct, overwrites);
  26526. if (funct["(context)"]) {
  26527. funct["(scope)"] = funct["(context)"]["(scope)"];
  26528. funct["(comparray)"] = funct["(context)"]["(comparray)"];
  26529. }
  26530. return funct;
  26531. }
  26532. /**
  26533. * Determine if the parser has begun parsing executable code.
  26534. *
  26535. * @param {Token} funct - The current "functor" token
  26536. *
  26537. * @returns {boolean}
  26538. */
  26539. function hasParsedCode(funct) {
  26540. return funct["(global)"] && !funct["(verb)"];
  26541. }
  26542. /**
  26543. * This function is used as both a null-denotation method *and* a
  26544. * left-denotation method, meaning the first parameter is overloaded.
  26545. */
  26546. function doTemplateLiteral(context, leftOrRbp) {
  26547. // ASSERT: this.type === "(template)"
  26548. // jshint validthis: true
  26549. var ctx = this.context;
  26550. var noSubst = this.noSubst;
  26551. var depth = this.depth;
  26552. var left = typeof leftOrRbp === "number" ? null : leftOrRbp;
  26553. if (!noSubst) {
  26554. while (!end()) {
  26555. if (!state.tokens.next.template || state.tokens.next.depth > depth) {
  26556. expression(context, 0); // should probably have different rbp?
  26557. } else {
  26558. // skip template start / middle
  26559. advance();
  26560. }
  26561. }
  26562. }
  26563. return {
  26564. id: "(template)",
  26565. type: "(template)",
  26566. tag: left
  26567. };
  26568. function end() {
  26569. if (state.tokens.curr.template && state.tokens.curr.tail &&
  26570. state.tokens.curr.context === ctx) {
  26571. /* istanbul ignore next */
  26572. return true;
  26573. }
  26574. var complete = (state.tokens.next.template && state.tokens.next.tail &&
  26575. state.tokens.next.context === ctx);
  26576. if (complete) advance();
  26577. return complete || state.tokens.next.isUnclosed;
  26578. }
  26579. }
  26580. /**
  26581. * Parse a function literal.
  26582. *
  26583. * @param {Number} context The parsing context
  26584. * @param {Object} [options]
  26585. * @param {string} [options.name] The identifier belonging to the function (if
  26586. * any)
  26587. * @param {token} [options.statement] The statement that triggered creation
  26588. * of the current function.
  26589. * @param {string} [options.type] If specified, either "generator" or "arrow"
  26590. * @param {token} [options.loneArg] The argument to the function in cases
  26591. * where it was defined using the
  26592. * single-argument shorthand
  26593. * @param {bool} [options.parsedOpening] Whether the opening parenthesis has
  26594. * already been parsed
  26595. * @param {string} [options.classExprBinding] Define a function with this
  26596. * identifier in the new function's
  26597. * scope, mimicking the bahavior of
  26598. * class expression names within
  26599. * the body of member functions.
  26600. */
  26601. function doFunction(context, options) {
  26602. var f, token, name, statement, classExprBinding, isGenerator, isArrow,
  26603. isMethod, ignoreLoopFunc;
  26604. var oldOption = state.option;
  26605. var oldIgnored = state.ignored;
  26606. var isAsync = context & prodParams.preAsync;
  26607. if (options) {
  26608. name = options.name;
  26609. statement = options.statement;
  26610. classExprBinding = options.classExprBinding;
  26611. isGenerator = options.type === "generator";
  26612. isArrow = options.type === "arrow";
  26613. isMethod = options.isMethod;
  26614. ignoreLoopFunc = options.ignoreLoopFunc;
  26615. }
  26616. context &= ~prodParams.noin;
  26617. context &= ~prodParams.tryClause;
  26618. if (isAsync) {
  26619. context |= prodParams.async;
  26620. } else {
  26621. context &= ~prodParams.async;
  26622. }
  26623. if (isGenerator) {
  26624. context |= prodParams.yield;
  26625. } else if (!isArrow) {
  26626. context &= ~prodParams.yield;
  26627. }
  26628. context &= ~prodParams.preAsync;
  26629. state.option = Object.create(state.option);
  26630. state.ignored = Object.create(state.ignored);
  26631. state.funct = functor(name || state.nameStack.infer(), state.tokens.next, {
  26632. "(statement)": statement,
  26633. "(context)": state.funct,
  26634. "(arrow)": isArrow,
  26635. "(method)": isMethod,
  26636. "(async)": isAsync
  26637. });
  26638. f = state.funct;
  26639. token = state.tokens.curr;
  26640. functions.push(state.funct);
  26641. // So that the function is available to itself and referencing itself is not
  26642. // seen as a closure, add the function name to a new scope, but do not
  26643. // test for unused (unused: false)
  26644. // it is a new block scope so that params can override it, it can be block scoped
  26645. // but declarations inside the function don't cause already declared error
  26646. state.funct["(scope)"].stack("functionouter");
  26647. var internallyAccessibleName = !isMethod && (name || classExprBinding);
  26648. if (internallyAccessibleName) {
  26649. state.funct["(scope)"].block.add(internallyAccessibleName,
  26650. classExprBinding ? "class" : "function", state.tokens.curr, false);
  26651. }
  26652. if (!isArrow) {
  26653. state.funct["(scope)"].funct.add("arguments", "var", token, false);
  26654. }
  26655. // create the param scope (params added in functionparams)
  26656. state.funct["(scope)"].stack("functionparams");
  26657. var paramsInfo = functionparams(context, options);
  26658. if (paramsInfo) {
  26659. state.funct["(params)"] = paramsInfo.params;
  26660. state.funct["(hasSimpleParams)"] = paramsInfo.isSimple;
  26661. state.funct["(metrics)"].arity = paramsInfo.arity;
  26662. state.funct["(metrics)"].verifyMaxParametersPerFunction();
  26663. } else {
  26664. state.funct["(params)"] = [];
  26665. state.funct["(metrics)"].arity = 0;
  26666. state.funct["(hasSimpleParams)"] = true;
  26667. }
  26668. if (isArrow) {
  26669. context &= ~prodParams.yield;
  26670. if (!state.inES6(true)) {
  26671. warning("W119", state.tokens.curr, "arrow function syntax (=>)", "6");
  26672. }
  26673. if (!options.loneArg) {
  26674. advance("=>");
  26675. }
  26676. }
  26677. block(context, false, true, true, isArrow);
  26678. if (!state.option.noyield && isGenerator && !state.funct["(yielded)"]) {
  26679. warning("W124", state.tokens.curr);
  26680. }
  26681. state.funct["(metrics)"].verifyMaxStatementsPerFunction();
  26682. state.funct["(metrics)"].verifyMaxComplexityPerFunction();
  26683. state.funct["(unusedOption)"] = state.option.unused;
  26684. state.option = oldOption;
  26685. state.ignored = oldIgnored;
  26686. state.funct["(last)"] = state.tokens.curr.line;
  26687. state.funct["(lastcharacter)"] = state.tokens.curr.character;
  26688. // unstack the params scope
  26689. state.funct["(scope)"].unstack(); // also does usage and label checks
  26690. // unstack the function outer stack
  26691. state.funct["(scope)"].unstack();
  26692. state.funct = state.funct["(context)"];
  26693. if (!ignoreLoopFunc && !state.option.loopfunc && state.funct["(loopage)"]) {
  26694. // If the function we just parsed accesses any non-local variables
  26695. // trigger a warning. Otherwise, the function is safe even within
  26696. // a loop.
  26697. if (f["(outerMutables)"]) {
  26698. warning("W083", token, f["(outerMutables)"].join(", "));
  26699. }
  26700. }
  26701. return f;
  26702. }
  26703. function createMetrics(functionStartToken) {
  26704. return {
  26705. statementCount: 0,
  26706. nestedBlockDepth: -1,
  26707. ComplexityCount: 1,
  26708. arity: 0,
  26709. verifyMaxStatementsPerFunction: function() {
  26710. if (state.option.maxstatements &&
  26711. this.statementCount > state.option.maxstatements) {
  26712. warning("W071", functionStartToken, this.statementCount);
  26713. }
  26714. },
  26715. verifyMaxParametersPerFunction: function() {
  26716. if (_.isNumber(state.option.maxparams) &&
  26717. this.arity > state.option.maxparams) {
  26718. warning("W072", functionStartToken, this.arity);
  26719. }
  26720. },
  26721. verifyMaxNestedBlockDepthPerFunction: function() {
  26722. if (state.option.maxdepth &&
  26723. this.nestedBlockDepth > 0 &&
  26724. this.nestedBlockDepth === state.option.maxdepth + 1) {
  26725. warning("W073", null, this.nestedBlockDepth);
  26726. }
  26727. },
  26728. verifyMaxComplexityPerFunction: function() {
  26729. var max = state.option.maxcomplexity;
  26730. var cc = this.ComplexityCount;
  26731. if (max && cc > max) {
  26732. warning("W074", functionStartToken, cc);
  26733. }
  26734. }
  26735. };
  26736. }
  26737. function increaseComplexityCount() {
  26738. state.funct["(metrics)"].ComplexityCount += 1;
  26739. }
  26740. // Parse assignments that were found instead of conditionals.
  26741. // For example: if (a = 1) { ... }
  26742. function checkCondAssignment(token) {
  26743. if (!token || token.paren) {
  26744. return;
  26745. }
  26746. if (token.id === ",") {
  26747. checkCondAssignment(token.right);
  26748. return;
  26749. }
  26750. switch (token.id) {
  26751. case "=":
  26752. case "+=":
  26753. case "-=":
  26754. case "*=":
  26755. case "%=":
  26756. case "&=":
  26757. case "|=":
  26758. case "^=":
  26759. case "/=":
  26760. if (!state.option.boss) {
  26761. warning("W084", token);
  26762. }
  26763. }
  26764. }
  26765. /**
  26766. * Validate the properties defined within an object literal or class body.
  26767. * See the `saveAccessor` and `saveProperty` functions for more detail.
  26768. *
  26769. * @param {object} props - Collection of objects describing the properties
  26770. * encountered
  26771. */
  26772. function checkProperties(props) {
  26773. // Check for lonely setters if in the ES5 mode.
  26774. if (state.inES5()) {
  26775. for (var name in props) {
  26776. if (props[name] && props[name].setterToken && !props[name].getterToken &&
  26777. !props[name].static) {
  26778. warning("W078", props[name].setterToken);
  26779. }
  26780. }
  26781. }
  26782. }
  26783. function metaProperty(context, name, c) {
  26784. if (checkPunctuator(state.tokens.next, ".")) {
  26785. var left = state.tokens.curr.id;
  26786. advance(".");
  26787. var id = identifier(context);
  26788. state.tokens.curr.isMetaProperty = true;
  26789. if (name !== id) {
  26790. error("E057", state.tokens.prev, left, id);
  26791. } else {
  26792. c();
  26793. }
  26794. return state.tokens.curr;
  26795. }
  26796. }
  26797. //object literals
  26798. (function(x) {
  26799. x.nud = function(context) {
  26800. var b, f, i, params, t, isGeneratorMethod = false, nextVal;
  26801. var props = Object.create(null); // All properties, including accessors
  26802. var isAsyncMethod = false;
  26803. b = !sameLine(state.tokens.curr, state.tokens.next);
  26804. if (b) {
  26805. indent += state.option.indent;
  26806. if (state.tokens.next.from === indent + state.option.indent) {
  26807. /* istanbul ignore next */
  26808. indent += state.option.indent;
  26809. }
  26810. }
  26811. var blocktype = lookupBlockType();
  26812. if (blocktype.isDestAssign) {
  26813. this.destructAssign = destructuringPattern(context, {
  26814. openingParsed: true,
  26815. assignment: true
  26816. });
  26817. return this;
  26818. }
  26819. state.inObjectBody = true;
  26820. for (;;) {
  26821. if (state.tokens.next.id === "}") {
  26822. break;
  26823. }
  26824. nextVal = state.tokens.next.value;
  26825. if (state.tokens.next.identifier &&
  26826. (peekIgnoreEOL().id === "," || peekIgnoreEOL().id === "}")) {
  26827. if (!state.inES6()) {
  26828. warning("W104", state.tokens.next, "object short notation", "6");
  26829. }
  26830. t = expression(context, 10);
  26831. i = t && t.value;
  26832. if (t) {
  26833. saveProperty(props, i, t);
  26834. }
  26835. } else if (peek().id !== ":" && (nextVal === "get" || nextVal === "set")) {
  26836. advance(nextVal);
  26837. if (!state.inES5()) {
  26838. error("E034");
  26839. }
  26840. if (state.tokens.next.id === "[") {
  26841. i = computedPropertyName(context);
  26842. } else {
  26843. i = propertyName(context);
  26844. // ES6 allows for get() {...} and set() {...} method
  26845. // definition shorthand syntax, so we don't produce an error
  26846. // if linting ECMAScript 6 code.
  26847. if (!i && !state.inES6()) {
  26848. error("E035");
  26849. }
  26850. }
  26851. // We don't want to save this getter unless it's an actual getter
  26852. // and not an ES6 concise method
  26853. if (i) {
  26854. saveAccessor(nextVal, props, i, state.tokens.curr);
  26855. }
  26856. t = state.tokens.next;
  26857. f = doFunction(context, { isMethod: true });
  26858. params = f["(params)"];
  26859. // Don't warn about getter/setter pairs if this is an ES6 concise method
  26860. if (nextVal === "get" && i && params.length) {
  26861. warning("W076", t, params[0], i);
  26862. } else if (nextVal === "set" && i && f["(metrics)"].arity !== 1) {
  26863. warning("W077", t, i);
  26864. }
  26865. } else if (spreadrest("spread")) {
  26866. if (!state.inES9()) {
  26867. warning("W119", state.tokens.next, "object spread property", "9");
  26868. }
  26869. expression(context, 10);
  26870. } else {
  26871. if (state.tokens.next.id === "async" && !checkPunctuators(peek(), ["(", ":"])) {
  26872. if (!state.inES8()) {
  26873. warning("W119", state.tokens.next, "async functions", "8");
  26874. }
  26875. isAsyncMethod = true;
  26876. advance();
  26877. nolinebreak(state.tokens.curr);
  26878. } else {
  26879. isAsyncMethod = false;
  26880. }
  26881. if (state.tokens.next.value === "*" && state.tokens.next.type === "(punctuator)") {
  26882. if (isAsyncMethod && !state.inES9()) {
  26883. warning("W119", state.tokens.next, "async generators", "9");
  26884. } else if (!state.inES6()) {
  26885. warning("W104", state.tokens.next, "generator functions", "6");
  26886. }
  26887. advance("*");
  26888. isGeneratorMethod = true;
  26889. } else {
  26890. isGeneratorMethod = false;
  26891. }
  26892. if (state.tokens.next.id === "[") {
  26893. i = computedPropertyName(context);
  26894. state.nameStack.set(i);
  26895. } else {
  26896. state.nameStack.set(state.tokens.next);
  26897. i = propertyName(context);
  26898. saveProperty(props, i, state.tokens.next);
  26899. if (typeof i !== "string") {
  26900. break;
  26901. }
  26902. }
  26903. if (state.tokens.next.value === "(") {
  26904. if (!state.inES6()) {
  26905. warning("W104", state.tokens.curr, "concise methods", "6");
  26906. }
  26907. doFunction(isAsyncMethod ? context | prodParams.preAsync : context, {
  26908. isMethod: true,
  26909. type: isGeneratorMethod ? "generator" : null
  26910. });
  26911. } else {
  26912. advance(":");
  26913. expression(context, 10);
  26914. }
  26915. }
  26916. countMember(i);
  26917. if (state.tokens.next.id === ",") {
  26918. advance(",");
  26919. checkComma({ allowTrailing: true, property: true });
  26920. if (state.tokens.next.id === ",") {
  26921. /* istanbul ignore next */
  26922. warning("W070", state.tokens.curr);
  26923. } else if (state.tokens.next.id === "}" && !state.inES5()) {
  26924. warning("W070", state.tokens.curr);
  26925. }
  26926. } else {
  26927. if (state.option.trailingcomma && state.inES5()) {
  26928. warningAt("W140", state.tokens.curr.line, state.tokens.curr.character);
  26929. }
  26930. break;
  26931. }
  26932. }
  26933. if (b) {
  26934. indent -= state.option.indent;
  26935. }
  26936. advance("}", this);
  26937. checkProperties(props);
  26938. state.inObjectBody = false;
  26939. return this;
  26940. };
  26941. x.fud = function() {
  26942. /* istanbul ignore next */
  26943. error("E036", state.tokens.curr);
  26944. };
  26945. }(delim("{")));
  26946. function destructuringPattern(context, options) {
  26947. var isAssignment = options && options.assignment;
  26948. context &= ~prodParams.noin;
  26949. if (!state.inES6()) {
  26950. warning("W104", state.tokens.curr,
  26951. isAssignment ? "destructuring assignment" : "destructuring binding", "6");
  26952. }
  26953. return destructuringPatternRecursive(context, options);
  26954. }
  26955. function destructuringPatternRecursive(context, options) {
  26956. var ids, idx;
  26957. var identifiers = [];
  26958. var openingParsed = options && options.openingParsed;
  26959. var isAssignment = options && options.assignment;
  26960. var recursiveOptions = isAssignment ? { assignment: isAssignment } : null;
  26961. var firstToken = openingParsed ? state.tokens.curr : state.tokens.next;
  26962. var nextInnerDE = function() {
  26963. var ident;
  26964. if (checkPunctuators(state.tokens.next, ["[", "{"])) {
  26965. ids = destructuringPatternRecursive(context, recursiveOptions);
  26966. for (idx = 0; idx < ids.length; idx++) {
  26967. identifiers.push({ id: ids[idx].id, token: ids[idx].token });
  26968. }
  26969. } else if (checkPunctuator(state.tokens.next, ",")) {
  26970. identifiers.push({ id: null, token: state.tokens.curr });
  26971. } else if (checkPunctuator(state.tokens.next, "(")) {
  26972. advance("(");
  26973. nextInnerDE();
  26974. advance(")");
  26975. } else {
  26976. if (isAssignment) {
  26977. var assignTarget = expression(context, 20);
  26978. if (assignTarget) {
  26979. checkLeftSideAssign(context, assignTarget);
  26980. // if the target was a simple identifier, add it to the list to return
  26981. if (assignTarget.identifier) {
  26982. ident = assignTarget.value;
  26983. }
  26984. }
  26985. } else {
  26986. ident = identifier(context);
  26987. }
  26988. if (ident) {
  26989. identifiers.push({ id: ident, token: state.tokens.curr });
  26990. }
  26991. }
  26992. };
  26993. var assignmentProperty = function(context) {
  26994. var id, expr;
  26995. if (checkPunctuator(state.tokens.next, "[")) {
  26996. advance("[");
  26997. expression(context, 10);
  26998. advance("]");
  26999. advance(":");
  27000. nextInnerDE();
  27001. } else if (state.tokens.next.id === "(string)" ||
  27002. state.tokens.next.id === "(number)") {
  27003. advance();
  27004. advance(":");
  27005. nextInnerDE();
  27006. } else {
  27007. // this id will either be the property name or the property name and the assigning identifier
  27008. var isRest = spreadrest("rest");
  27009. if (isRest) {
  27010. if (!state.inES9()) {
  27011. warning("W119", state.tokens.next, "object rest property", "9");
  27012. }
  27013. // Due to visual symmetry with the array rest property (and the early
  27014. // design of the language feature), developers may mistakenly assume
  27015. // any expression is valid in this position. If the next token is not
  27016. // an identifier, attempt to parse an expression and issue an error.
  27017. // order to recover more gracefully from this condition.
  27018. if (state.tokens.next.type === "(identifier)") {
  27019. id = identifier(context);
  27020. } else {
  27021. expr = expression(context, 10);
  27022. error("E030", expr, expr.value);
  27023. }
  27024. } else {
  27025. id = identifier(context);
  27026. }
  27027. if (!isRest && checkPunctuator(state.tokens.next, ":")) {
  27028. advance(":");
  27029. nextInnerDE();
  27030. } else if (id) {
  27031. // in this case we are assigning (not declaring), so check assignment
  27032. if (isAssignment) {
  27033. checkLeftSideAssign(context, state.tokens.curr);
  27034. }
  27035. identifiers.push({ id: id, token: state.tokens.curr });
  27036. }
  27037. if (isRest && checkPunctuator(state.tokens.next, ",")) {
  27038. warning("W130", state.tokens.next);
  27039. }
  27040. }
  27041. };
  27042. var id, value;
  27043. if (checkPunctuator(firstToken, "[")) {
  27044. if (!openingParsed) {
  27045. advance("[");
  27046. }
  27047. if (checkPunctuator(state.tokens.next, "]")) {
  27048. warning("W137", state.tokens.curr);
  27049. }
  27050. var element_after_rest = false;
  27051. while (!checkPunctuator(state.tokens.next, "]")) {
  27052. var isRest = spreadrest("rest");
  27053. nextInnerDE();
  27054. if (isRest && !element_after_rest &&
  27055. checkPunctuator(state.tokens.next, ",")) {
  27056. warning("W130", state.tokens.next);
  27057. element_after_rest = true;
  27058. }
  27059. if (!isRest && checkPunctuator(state.tokens.next, "=")) {
  27060. if (checkPunctuator(state.tokens.prev, "...")) {
  27061. /* istanbul ignore next */
  27062. advance("]");
  27063. } else {
  27064. advance("=");
  27065. }
  27066. id = state.tokens.prev;
  27067. value = expression(context, 10);
  27068. if (value && value.identifier && value.value === "undefined") {
  27069. warning("W080", id, id.value);
  27070. }
  27071. }
  27072. if (!checkPunctuator(state.tokens.next, "]")) {
  27073. advance(",");
  27074. }
  27075. }
  27076. advance("]");
  27077. } else if (checkPunctuator(firstToken, "{")) {
  27078. if (!openingParsed) {
  27079. advance("{");
  27080. }
  27081. if (checkPunctuator(state.tokens.next, "}")) {
  27082. warning("W137", state.tokens.curr);
  27083. }
  27084. while (!checkPunctuator(state.tokens.next, "}")) {
  27085. assignmentProperty(context);
  27086. if (checkPunctuator(state.tokens.next, "=")) {
  27087. advance("=");
  27088. id = state.tokens.prev;
  27089. value = expression(context, 10);
  27090. if (value && value.identifier && value.value === "undefined") {
  27091. warning("W080", id, id.value);
  27092. }
  27093. }
  27094. if (!checkPunctuator(state.tokens.next, "}")) {
  27095. advance(",");
  27096. if (checkPunctuator(state.tokens.next, "}")) {
  27097. // Trailing comma
  27098. // ObjectBindingPattern: { BindingPropertyList , }
  27099. break;
  27100. }
  27101. }
  27102. }
  27103. advance("}");
  27104. }
  27105. return identifiers;
  27106. }
  27107. function destructuringPatternMatch(tokens, value) {
  27108. var first = value.first;
  27109. if (!first)
  27110. return;
  27111. _.zip(tokens, Array.isArray(first) ? first : [ first ]).forEach(function(val) {
  27112. var token = val[0];
  27113. var value = val[1];
  27114. if (token && value)
  27115. token.first = value;
  27116. else if (token && token.first && !value)
  27117. /* istanbul ignore next */
  27118. warning("W080", token.first, token.first.value);
  27119. });
  27120. }
  27121. function blockVariableStatement(type, statement, context) {
  27122. // used for both let and const statements
  27123. var noin = context & prodParams.noin;
  27124. var isLet = type === "let";
  27125. var isConst = type === "const";
  27126. var tokens, lone, value, letblock;
  27127. if (!state.inES6()) {
  27128. warning("W104", state.tokens.curr, type, "6");
  27129. }
  27130. if (isLet && isMozillaLet()) {
  27131. advance("(");
  27132. state.funct["(scope)"].stack();
  27133. letblock = true;
  27134. statement.declaration = false;
  27135. }
  27136. statement.first = [];
  27137. for (;;) {
  27138. var names = [];
  27139. if (_.includes(["{", "["], state.tokens.next.value)) {
  27140. tokens = destructuringPattern(context);
  27141. lone = false;
  27142. } else {
  27143. tokens = [ { id: identifier(context), token: state.tokens.curr } ];
  27144. lone = true;
  27145. }
  27146. // A `const` declaration without an initializer is permissible within the
  27147. // head of for-in and for-of statements. If this binding list is being
  27148. // parsed as part of a `for` statement of any kind, allow the initializer
  27149. // to be omitted. Although this may erroneously allow such forms from
  27150. // "C-style" `for` statements (i.e. `for (const x;;) {}`, the `for`
  27151. // statement logic includes dedicated logic to issue the error for such
  27152. // cases.
  27153. if (!noin && isConst && state.tokens.next.id !== "=") {
  27154. warning("E012", state.tokens.curr, state.tokens.curr.value);
  27155. }
  27156. for (var t in tokens) {
  27157. if (tokens.hasOwnProperty(t)) {
  27158. t = tokens[t];
  27159. // It is a Syntax Error if the BoundNames of BindingList contains
  27160. // "let".
  27161. if (t.id === "let") {
  27162. /* istanbul ignore next */
  27163. warning("W024", t.token, t.id);
  27164. }
  27165. if (state.funct["(scope)"].block.isGlobal()) {
  27166. if (predefined[t.id] === false) {
  27167. warning("W079", t.token, t.id);
  27168. }
  27169. }
  27170. if (t.id) {
  27171. state.funct["(scope)"].addbinding(t.id, {
  27172. type: type,
  27173. token: t.token });
  27174. names.push(t.token);
  27175. }
  27176. }
  27177. }
  27178. if (state.tokens.next.id === "=") {
  27179. statement.hasInitializer = true;
  27180. advance("=");
  27181. if (!noin && peek(0).id === "=" && state.tokens.next.identifier) {
  27182. warning("W120", state.tokens.next, state.tokens.next.value);
  27183. }
  27184. var id = state.tokens.prev;
  27185. value = expression(context, 10);
  27186. if (value) {
  27187. if (value.identifier && value.value === "undefined") {
  27188. warning("W080", id, id.value);
  27189. }
  27190. if (!lone) {
  27191. destructuringPatternMatch(names, value);
  27192. }
  27193. }
  27194. }
  27195. // Bindings are not immediately initialized in for-in and for-of
  27196. // statements. As with `const` initializers (described above), the `for`
  27197. // statement parsing logic includes
  27198. if (state.tokens.next.value !== "in" && state.tokens.next.value !== "of") {
  27199. for (t in tokens) {
  27200. if (tokens.hasOwnProperty(t)) {
  27201. t = tokens[t];
  27202. state.funct["(scope)"].initialize(t.id);
  27203. }
  27204. }
  27205. }
  27206. statement.first = statement.first.concat(names);
  27207. if (state.tokens.next.id !== ",") {
  27208. break;
  27209. }
  27210. statement.hasComma = true;
  27211. advance(",");
  27212. checkComma();
  27213. }
  27214. if (letblock) {
  27215. advance(")");
  27216. block(context, true, true);
  27217. statement.block = true;
  27218. state.funct["(scope)"].unstack();
  27219. }
  27220. return statement;
  27221. }
  27222. var conststatement = stmt("const", function(context) {
  27223. return blockVariableStatement("const", this, context);
  27224. });
  27225. conststatement.exps = true;
  27226. conststatement.declaration = true;
  27227. /**
  27228. * Determine if the current `let` token designates the beginning of a "let
  27229. * block" or "let expression" as implemented in the Mozilla SpiderMonkey
  27230. * engine.
  27231. *
  27232. * This function will only return `true` if Mozilla extensions have been
  27233. * enabled. It would be preferable to detect the language feature regardless
  27234. * of the parser's state because this would allow JSHint to instruct users to
  27235. * enable the `moz` option where necessary. This is not possible because the
  27236. * language extension is not compatible with standard JavaScript. For
  27237. * example, the following program code may describe a "let block" or a
  27238. * function invocation:
  27239. *
  27240. * let(x)
  27241. * {
  27242. * typeof x;
  27243. * }
  27244. *
  27245. * @returns {boolean}
  27246. */
  27247. function isMozillaLet() {
  27248. return state.tokens.next.id === "(" && state.inMoz();
  27249. }
  27250. var letstatement = stmt("let", function(context) {
  27251. return blockVariableStatement("let", this, context);
  27252. });
  27253. letstatement.nud = function(context, rbp) {
  27254. if (isMozillaLet()) {
  27255. // create a new block scope we use only for the current expression
  27256. state.funct["(scope)"].stack();
  27257. advance("(");
  27258. state.tokens.prev.fud(context);
  27259. advance(")");
  27260. expression(context, rbp);
  27261. state.funct["(scope)"].unstack();
  27262. } else {
  27263. this.exps = false;
  27264. return state.syntax["(identifier)"].nud.apply(this, arguments);
  27265. }
  27266. };
  27267. letstatement.meta = { es5: true, isFutureReservedWord: false, strictOnly: true };
  27268. letstatement.exps = true;
  27269. letstatement.declaration = true;
  27270. letstatement.useFud = function(context) {
  27271. var next = state.tokens.next;
  27272. var nextIsBindingName;
  27273. if (this.line !== next.line && !state.inES6()) {
  27274. return false;
  27275. }
  27276. // JSHint generally interprets `let` as a reserved word even though it is
  27277. // not considered as such by the ECMAScript specification because doing so
  27278. // simplifies parsing logic. It is special-cased here so that code such as
  27279. //
  27280. // let
  27281. // let
  27282. //
  27283. // is correctly interpreted as an invalid LexicalBinding. (Without this
  27284. // consideration, the code above would be parsed as two
  27285. // IdentifierReferences.)
  27286. nextIsBindingName = next.identifier && (!isReserved(context, next) ||
  27287. next.id === "let");
  27288. return nextIsBindingName || checkPunctuators(next, ["{", "["]) ||
  27289. isMozillaLet();
  27290. };
  27291. var varstatement = stmt("var", function(context) {
  27292. var noin = context & prodParams.noin;
  27293. var tokens, lone, value, id;
  27294. this.first = [];
  27295. for (;;) {
  27296. var names = [];
  27297. if (_.includes(["{", "["], state.tokens.next.value)) {
  27298. tokens = destructuringPattern(context);
  27299. lone = false;
  27300. } else {
  27301. tokens = [];
  27302. id = identifier(context);
  27303. if (id) {
  27304. tokens.push({ id: id, token: state.tokens.curr });
  27305. }
  27306. lone = true;
  27307. }
  27308. if (state.option.varstmt) {
  27309. warning("W132", this);
  27310. }
  27311. for (var t in tokens) {
  27312. if (tokens.hasOwnProperty(t)) {
  27313. t = tokens[t];
  27314. if (state.funct["(global)"] && !state.impliedClosure()) {
  27315. if (predefined[t.id] === false) {
  27316. warning("W079", t.token, t.id);
  27317. } else if (state.option.futurehostile === false) {
  27318. if ((!state.inES5() && vars.ecmaIdentifiers[5][t.id] === false) ||
  27319. (!state.inES6() && vars.ecmaIdentifiers[6][t.id] === false)) {
  27320. warning("W129", t.token, t.id);
  27321. }
  27322. }
  27323. }
  27324. if (t.id) {
  27325. state.funct["(scope)"].addbinding(t.id, {
  27326. type: "var",
  27327. token: t.token });
  27328. names.push(t.token);
  27329. }
  27330. }
  27331. }
  27332. if (state.tokens.next.id === "=") {
  27333. this.hasInitializer = true;
  27334. state.nameStack.set(state.tokens.curr);
  27335. advance("=");
  27336. if (peek(0).id === "=" && state.tokens.next.identifier) {
  27337. if (!noin &&
  27338. !state.funct["(params)"] ||
  27339. state.funct["(params)"].indexOf(state.tokens.next.value) === -1) {
  27340. warning("W120", state.tokens.next, state.tokens.next.value);
  27341. }
  27342. }
  27343. id = state.tokens.prev;
  27344. value = expression(context, 10);
  27345. if (value) {
  27346. if (!state.funct["(loopage)"] && value.identifier &&
  27347. value.value === "undefined") {
  27348. warning("W080", id, id.value);
  27349. }
  27350. if (!lone) {
  27351. destructuringPatternMatch(names, value);
  27352. }
  27353. }
  27354. }
  27355. this.first = this.first.concat(names);
  27356. if (state.tokens.next.id !== ",") {
  27357. break;
  27358. }
  27359. this.hasComma = true;
  27360. advance(",");
  27361. checkComma();
  27362. }
  27363. return this;
  27364. });
  27365. varstatement.exps = true;
  27366. blockstmt("function", function(context) {
  27367. var inexport = context & prodParams.export;
  27368. var generator = false;
  27369. var isAsync = context & prodParams.preAsync;
  27370. var labelType = "";
  27371. if (isAsync) {
  27372. labelType = "async ";
  27373. }
  27374. if (state.tokens.next.value === "*") {
  27375. if (isAsync && !state.inES9()) {
  27376. warning("W119", state.tokens.prev, "async generators", "9");
  27377. } else if (!isAsync && !state.inES6(true)) {
  27378. warning("W119", state.tokens.next, "function*", "6");
  27379. }
  27380. advance("*");
  27381. labelType += "generator ";
  27382. generator = true;
  27383. }
  27384. labelType += "function";
  27385. if (inblock) {
  27386. warning("W082", state.tokens.curr);
  27387. }
  27388. this.name = optionalidentifier(context) ? state.tokens.curr : null;
  27389. if (!this.name) {
  27390. if (!inexport) {
  27391. warning("W025");
  27392. }
  27393. } else {
  27394. state.funct["(scope)"].addbinding(this.name.value, {
  27395. type: labelType,
  27396. token: state.tokens.curr,
  27397. initialized: true });
  27398. }
  27399. var f = doFunction(context, {
  27400. name: this.name && this.name.value,
  27401. statement: this,
  27402. type: generator ? "generator" : null,
  27403. ignoreLoopFunc: inblock // a declaration may already have warned
  27404. });
  27405. // If the function declaration is strict because the surrounding code is
  27406. // strict, the invalid name will trigger E008 when the scope manager
  27407. // attempts to create a binding in the strict environment record. An error
  27408. // should only be signaled here when the function itself enables strict
  27409. // mode (the scope manager will not report an error because a declaration
  27410. // does not introduce a binding into the function's environment record).
  27411. var enablesStrictMode = f["(isStrict)"] && !state.isStrict();
  27412. if (this.name && (f["(name)"] === "arguments" || f["(name)"] === "eval") &&
  27413. enablesStrictMode) {
  27414. error("E008", this.name);
  27415. }
  27416. // Although the parser correctly recognizes the statement boundary in this
  27417. // condition, it's support for the invalid "empty grouping" expression
  27418. // makes it tolerant of productions such as `function f() {}();`.
  27419. if (state.tokens.next.id === "(" && peek().id === ")" && peek(1).id !== "=>" &&
  27420. state.tokens.next.line === state.tokens.curr.line) {
  27421. error("E039");
  27422. }
  27423. return this;
  27424. }).declaration = true;
  27425. prefix("function", function(context) {
  27426. var generator = false;
  27427. var isAsync = context & prodParams.preAsync;
  27428. if (state.tokens.next.value === "*") {
  27429. if (isAsync && !state.inES9()) {
  27430. warning("W119", state.tokens.prev, "async generators", "9");
  27431. } else if (!isAsync && !state.inES6(true)) {
  27432. warning("W119", state.tokens.curr, "function*", "6");
  27433. }
  27434. advance("*");
  27435. generator = true;
  27436. }
  27437. // This context modification restricts the use of `await` as the optional
  27438. // BindingIdentifier in async function expressions.
  27439. this.name = optionalidentifier(isAsync ? context | prodParams.async : context) ?
  27440. state.tokens.curr : null;
  27441. var f = doFunction(context, {
  27442. name: this.name && this.name.value,
  27443. type: generator ? "generator" : null
  27444. });
  27445. if (generator && this.name && this.name.value === "yield") {
  27446. error("E024", this.name, "yield");
  27447. }
  27448. if (this.name && (f["(name)"] === "arguments" || f["(name)"] === "eval") &&
  27449. f["(isStrict)"]) {
  27450. error("E008", this.name);
  27451. }
  27452. return this;
  27453. });
  27454. blockstmt("if", function(context) {
  27455. var t = state.tokens.next;
  27456. increaseComplexityCount();
  27457. advance("(");
  27458. var expr = expression(context, 0);
  27459. if (!expr) {
  27460. quit("E041", this);
  27461. }
  27462. checkCondAssignment(expr);
  27463. // When the if is within a for-in loop, check if the condition
  27464. // starts with a negation operator
  27465. var forinifcheck = null;
  27466. if (state.option.forin && state.forinifcheckneeded) {
  27467. state.forinifcheckneeded = false; // We only need to analyze the first if inside the loop
  27468. forinifcheck = state.forinifchecks[state.forinifchecks.length - 1];
  27469. if (expr.type === "(punctuator)" && expr.value === "!") {
  27470. forinifcheck.type = "(negative)";
  27471. } else {
  27472. forinifcheck.type = "(positive)";
  27473. }
  27474. }
  27475. advance(")", t);
  27476. var s = block(context, true, true);
  27477. // When the if is within a for-in loop and the condition has a negative form,
  27478. // check if the body contains nothing but a continue statement
  27479. if (forinifcheck && forinifcheck.type === "(negative)") {
  27480. if (s && s[0] && s[0].type === "(identifier)" && s[0].value === "continue") {
  27481. forinifcheck.type = "(negative-with-continue)";
  27482. }
  27483. }
  27484. if (state.tokens.next.id === "else") {
  27485. advance("else");
  27486. if (state.tokens.next.id === "if" || state.tokens.next.id === "switch") {
  27487. statement(context);
  27488. } else {
  27489. block(context, true, true);
  27490. }
  27491. }
  27492. return this;
  27493. });
  27494. blockstmt("try", function(context) {
  27495. var b;
  27496. var hasParameter = false;
  27497. function catchParameter() {
  27498. advance("(");
  27499. if (checkPunctuators(state.tokens.next, ["[", "{"])) {
  27500. var tokens = destructuringPattern(context);
  27501. _.each(tokens, function(token) {
  27502. if (token.id) {
  27503. state.funct["(scope)"].addParam(token.id, token.token, "exception");
  27504. }
  27505. });
  27506. } else if (state.tokens.next.type !== "(identifier)") {
  27507. warning("E030", state.tokens.next, state.tokens.next.value);
  27508. } else {
  27509. // only advance if an identifier is present. This allows JSHint to
  27510. // recover from the case where no value is specified.
  27511. state.funct["(scope)"].addParam(identifier(context), state.tokens.curr, "exception");
  27512. }
  27513. if (state.tokens.next.value === "if") {
  27514. if (!state.inMoz()) {
  27515. warning("W118", state.tokens.curr, "catch filter");
  27516. }
  27517. advance("if");
  27518. expression(context, 0);
  27519. }
  27520. advance(")");
  27521. }
  27522. block(context | prodParams.tryClause, true);
  27523. while (state.tokens.next.id === "catch") {
  27524. increaseComplexityCount();
  27525. if (b && (!state.inMoz())) {
  27526. warning("W118", state.tokens.next, "multiple catch blocks");
  27527. }
  27528. advance("catch");
  27529. if (state.tokens.next.id !== "{") {
  27530. state.funct["(scope)"].stack("catchparams");
  27531. hasParameter = true;
  27532. catchParameter();
  27533. } else if (!state.inES10()) {
  27534. warning("W119", state.tokens.curr, "optional catch binding", "10");
  27535. }
  27536. block(context, false);
  27537. if (hasParameter) {
  27538. state.funct["(scope)"].unstack();
  27539. hasParameter = false;
  27540. }
  27541. b = true;
  27542. }
  27543. if (state.tokens.next.id === "finally") {
  27544. advance("finally");
  27545. block(context, true);
  27546. return;
  27547. }
  27548. if (!b) {
  27549. error("E021", state.tokens.next, "catch", state.tokens.next.value);
  27550. }
  27551. return this;
  27552. });
  27553. blockstmt("while", function(context) {
  27554. var t = state.tokens.next;
  27555. state.funct["(breakage)"] += 1;
  27556. state.funct["(loopage)"] += 1;
  27557. increaseComplexityCount();
  27558. advance("(");
  27559. checkCondAssignment(expression(context, 0));
  27560. advance(")", t);
  27561. block(context, true, true);
  27562. state.funct["(breakage)"] -= 1;
  27563. state.funct["(loopage)"] -= 1;
  27564. return this;
  27565. }).labelled = true;
  27566. blockstmt("with", function(context) {
  27567. var t = state.tokens.next;
  27568. if (state.isStrict()) {
  27569. error("E010", state.tokens.curr);
  27570. } else if (!state.option.withstmt) {
  27571. warning("W085", state.tokens.curr);
  27572. }
  27573. advance("(");
  27574. expression(context, 0);
  27575. advance(")", t);
  27576. block(context, true, true);
  27577. return this;
  27578. });
  27579. blockstmt("switch", function(context) {
  27580. var t = state.tokens.next;
  27581. var g = false;
  27582. var noindent = false;
  27583. var seenCase = false;
  27584. state.funct["(breakage)"] += 1;
  27585. advance("(");
  27586. checkCondAssignment(expression(context, 0));
  27587. advance(")", t);
  27588. t = state.tokens.next;
  27589. advance("{");
  27590. state.funct["(scope)"].stack();
  27591. if (state.tokens.next.from === indent)
  27592. noindent = true;
  27593. if (!noindent)
  27594. indent += state.option.indent;
  27595. for (;;) {
  27596. switch (state.tokens.next.id) {
  27597. case "case":
  27598. switch (state.funct["(verb)"]) {
  27599. case "yield":
  27600. case "break":
  27601. case "case":
  27602. case "continue":
  27603. case "return":
  27604. case "switch":
  27605. case "throw":
  27606. break;
  27607. case "default":
  27608. if (state.option.leanswitch) {
  27609. warning("W145", state.tokens.next);
  27610. }
  27611. break;
  27612. default:
  27613. // You can tell JSHint that you don't use break intentionally by
  27614. // adding a comment /* falls through */ on a line just before
  27615. // the next `case`.
  27616. if (!state.tokens.curr.caseFallsThrough) {
  27617. warning("W086", state.tokens.curr, "case");
  27618. }
  27619. }
  27620. advance("case");
  27621. expression(context, 0);
  27622. seenCase = true;
  27623. increaseComplexityCount();
  27624. g = true;
  27625. advance(":");
  27626. state.funct["(verb)"] = "case";
  27627. break;
  27628. case "default":
  27629. switch (state.funct["(verb)"]) {
  27630. case "yield":
  27631. case "break":
  27632. case "continue":
  27633. case "return":
  27634. case "throw":
  27635. break;
  27636. case "case":
  27637. if (state.option.leanswitch) {
  27638. warning("W145", state.tokens.curr);
  27639. }
  27640. break;
  27641. default:
  27642. // Do not display a warning if 'default' is the first statement or if
  27643. // there is a special /* falls through */ comment.
  27644. if (seenCase && !state.tokens.curr.caseFallsThrough) {
  27645. warning("W086", state.tokens.curr, "default");
  27646. }
  27647. }
  27648. advance("default");
  27649. g = true;
  27650. advance(":");
  27651. state.funct["(verb)"] = "default";
  27652. break;
  27653. case "}":
  27654. if (!noindent)
  27655. indent -= state.option.indent;
  27656. advance("}", t);
  27657. state.funct["(scope)"].unstack();
  27658. state.funct["(breakage)"] -= 1;
  27659. state.funct["(verb)"] = undefined;
  27660. return;
  27661. /* istanbul ignore next */
  27662. case "(end)":
  27663. error("E023", state.tokens.next, "}");
  27664. return;
  27665. default:
  27666. indent += state.option.indent;
  27667. if (g) {
  27668. switch (state.tokens.curr.id) {
  27669. /* istanbul ignore next */
  27670. case ",":
  27671. error("E040");
  27672. return;
  27673. case ":":
  27674. g = false;
  27675. statements(context);
  27676. break;
  27677. /* istanbul ignore next */
  27678. default:
  27679. error("E025", state.tokens.curr);
  27680. return;
  27681. }
  27682. } else {
  27683. /* istanbul ignore else */
  27684. if (state.tokens.curr.id === ":") {
  27685. advance(":");
  27686. error("E024", state.tokens.curr, ":");
  27687. statements(context);
  27688. } else {
  27689. error("E021", state.tokens.next, "case", state.tokens.next.value);
  27690. return;
  27691. }
  27692. }
  27693. indent -= state.option.indent;
  27694. }
  27695. }
  27696. }).labelled = true;
  27697. stmt("debugger", function() {
  27698. if (!state.option.debug) {
  27699. warning("W087", this);
  27700. }
  27701. return this;
  27702. }).exps = true;
  27703. (function() {
  27704. var x = stmt("do", function(context) {
  27705. state.funct["(breakage)"] += 1;
  27706. state.funct["(loopage)"] += 1;
  27707. increaseComplexityCount();
  27708. this.first = block(context, true, true);
  27709. advance("while");
  27710. var t = state.tokens.next;
  27711. advance("(");
  27712. checkCondAssignment(expression(context, 0));
  27713. advance(")", t);
  27714. state.funct["(breakage)"] -= 1;
  27715. state.funct["(loopage)"] -= 1;
  27716. return this;
  27717. });
  27718. x.labelled = true;
  27719. x.exps = true;
  27720. }());
  27721. blockstmt("for", function(context) {
  27722. var s, t = state.tokens.next;
  27723. var letscope = false;
  27724. var isAsync = false;
  27725. var foreachtok = null;
  27726. if (t.value === "each") {
  27727. foreachtok = t;
  27728. advance("each");
  27729. if (!state.inMoz()) {
  27730. warning("W118", state.tokens.curr, "for each");
  27731. }
  27732. }
  27733. if (state.tokens.next.identifier && state.tokens.next.value === "await") {
  27734. advance("await");
  27735. isAsync = true;
  27736. if (!(context & prodParams.async)) {
  27737. error("E024", state.tokens.curr, "await");
  27738. } else if (!state.inES9()) {
  27739. warning("W119", state.tokens.curr, "asynchronous iteration", "9");
  27740. }
  27741. }
  27742. increaseComplexityCount();
  27743. advance("(");
  27744. // what kind of for(…) statement it is? for(…of…)? for(…in…)? for(…;…;…)?
  27745. var nextop; // contains the token of the "in" or "of" operator
  27746. var comma; // First comma punctuator at level 0
  27747. var initializer; // First initializer at level 0
  27748. var bindingPower;
  27749. var targets;
  27750. var target;
  27751. var decl;
  27752. var afterNext = peek();
  27753. var headContext = context | prodParams.noin;
  27754. if (state.tokens.next.id === "var") {
  27755. advance("var");
  27756. decl = state.tokens.curr.fud(headContext);
  27757. comma = decl.hasComma ? decl : null;
  27758. initializer = decl.hasInitializer ? decl : null;
  27759. } else if (state.tokens.next.id === "const" ||
  27760. // The "let" keyword only signals a lexical binding if it is followed by
  27761. // an identifier, `{`, or `[`. Otherwise, it should be parsed as an
  27762. // IdentifierReference (i.e. in a subsquent branch).
  27763. (state.tokens.next.id === "let" &&
  27764. ((afterNext.identifier && afterNext.id !== "in") ||
  27765. checkPunctuators(afterNext, ["{", "["])))) {
  27766. advance(state.tokens.next.id);
  27767. // create a new block scope
  27768. letscope = true;
  27769. state.funct["(scope)"].stack();
  27770. decl = state.tokens.curr.fud(headContext);
  27771. comma = decl.hasComma ? decl : null;
  27772. initializer = decl.hasInitializer ? decl : null;
  27773. } else if (!checkPunctuator(state.tokens.next, ";")) {
  27774. targets = [];
  27775. while (state.tokens.next.value !== "in" &&
  27776. state.tokens.next.value !== "of" &&
  27777. !checkPunctuator(state.tokens.next, ";")) {
  27778. if (checkPunctuators(state.tokens.next, ["{", "["])) {
  27779. destructuringPattern(headContext, { assignment: true })
  27780. .forEach(function(elem) {
  27781. this.push(elem.token);
  27782. }, targets);
  27783. if (checkPunctuator(state.tokens.next, "=")) {
  27784. advance("=");
  27785. initializer = state.tokens.curr;
  27786. expression(headContext, 10);
  27787. }
  27788. } else {
  27789. target = expression(headContext, 10);
  27790. if (target) {
  27791. if (target.type === "(identifier)") {
  27792. targets.push(target);
  27793. } else if (checkPunctuator(target, "=")) {
  27794. initializer = target;
  27795. targets.push(target);
  27796. }
  27797. }
  27798. }
  27799. if (checkPunctuator(state.tokens.next, ",")) {
  27800. advance(",");
  27801. if (!comma) {
  27802. comma = state.tokens.curr;
  27803. }
  27804. }
  27805. }
  27806. //checkLeftSideAssign(target, nextop);
  27807. // In the event of a syntax error, do not issue warnings regarding the
  27808. // implicit creation of bindings.
  27809. if (!initializer && !comma) {
  27810. targets.forEach(function(token) {
  27811. if (!state.funct["(scope)"].has(token.value)) {
  27812. warning("W088", token, token.value);
  27813. }
  27814. });
  27815. }
  27816. }
  27817. nextop = state.tokens.next;
  27818. if (isAsync && nextop.value !== "of") {
  27819. error("E066", nextop);
  27820. }
  27821. // if we're in a for (… in|of …) statement
  27822. if (_.includes(["in", "of"], nextop.value)) {
  27823. if (nextop.value === "of") {
  27824. bindingPower = 20;
  27825. if (!state.inES6()) {
  27826. warning("W104", nextop, "for of", "6");
  27827. }
  27828. } else {
  27829. bindingPower = 0;
  27830. }
  27831. if (comma) {
  27832. error("W133", comma, nextop.value, "more than one ForBinding");
  27833. }
  27834. if (initializer) {
  27835. error("W133", initializer, nextop.value, "initializer is forbidden");
  27836. }
  27837. if (target && !comma && !initializer) {
  27838. checkLeftSideAssign(context, target, nextop);
  27839. }
  27840. advance(nextop.value);
  27841. // The binding power is variable because for-in statements accept any
  27842. // Expression in this position, while for-of statements are limited to
  27843. // AssignmentExpressions. For example:
  27844. //
  27845. // for ( LeftHandSideExpression in Expression ) Statement
  27846. // for ( LeftHandSideExpression of AssignmentExpression ) Statement
  27847. expression(context, bindingPower);
  27848. advance(")", t);
  27849. if (nextop.value === "in" && state.option.forin) {
  27850. state.forinifcheckneeded = true;
  27851. if (state.forinifchecks === undefined) {
  27852. state.forinifchecks = [];
  27853. }
  27854. // Push a new for-in-if check onto the stack. The type will be modified
  27855. // when the loop's body is parsed and a suitable if statement exists.
  27856. state.forinifchecks.push({
  27857. type: "(none)"
  27858. });
  27859. }
  27860. state.funct["(breakage)"] += 1;
  27861. state.funct["(loopage)"] += 1;
  27862. s = block(context, true, true);
  27863. if (nextop.value === "in" && state.option.forin) {
  27864. if (state.forinifchecks && state.forinifchecks.length > 0) {
  27865. var check = state.forinifchecks.pop();
  27866. if (// No if statement or not the first statement in loop body
  27867. s && s.length > 0 && (typeof s[0] !== "object" || s[0].value !== "if") ||
  27868. // Positive if statement is not the only one in loop body
  27869. check.type === "(positive)" && s.length > 1 ||
  27870. // Negative if statement but no continue
  27871. check.type === "(negative)") {
  27872. warning("W089", this);
  27873. }
  27874. }
  27875. // Reset the flag in case no if statement was contained in the loop body
  27876. state.forinifcheckneeded = false;
  27877. }
  27878. state.funct["(breakage)"] -= 1;
  27879. state.funct["(loopage)"] -= 1;
  27880. } else {
  27881. if (foreachtok) {
  27882. error("E045", foreachtok);
  27883. }
  27884. advance(";");
  27885. if (decl && decl.first && decl.first[0]) {
  27886. if (decl.value === "const" && !decl.hasInitializer) {
  27887. warning("E012", decl, decl.first[0].value);
  27888. }
  27889. decl.first.forEach(function(token) {
  27890. state.funct["(scope)"].initialize(token.value);
  27891. });
  27892. }
  27893. // start loopage after the first ; as the next two expressions are executed
  27894. // on every loop
  27895. state.funct["(loopage)"] += 1;
  27896. if (state.tokens.next.id !== ";") {
  27897. checkCondAssignment(expression(context, 0));
  27898. }
  27899. advance(";");
  27900. if (state.tokens.next.id === ";") {
  27901. error("E021", state.tokens.next, ")", ";");
  27902. }
  27903. if (state.tokens.next.id !== ")") {
  27904. for (;;) {
  27905. expression(context, 0);
  27906. if (state.tokens.next.id !== ",") {
  27907. break;
  27908. }
  27909. advance(",");
  27910. checkComma();
  27911. }
  27912. }
  27913. advance(")", t);
  27914. state.funct["(breakage)"] += 1;
  27915. block(context, true, true);
  27916. state.funct["(breakage)"] -= 1;
  27917. state.funct["(loopage)"] -= 1;
  27918. }
  27919. // unstack loop blockscope
  27920. if (letscope) {
  27921. state.funct["(scope)"].unstack();
  27922. }
  27923. return this;
  27924. }).labelled = true;
  27925. stmt("break", function() {
  27926. var v = state.tokens.next.value;
  27927. if (state.tokens.next.identifier &&
  27928. sameLine(state.tokens.curr, state.tokens.next)) {
  27929. if (!state.funct["(scope)"].funct.hasLabel(v)) {
  27930. warning("W090", state.tokens.next, v);
  27931. }
  27932. this.first = state.tokens.next;
  27933. advance();
  27934. } else {
  27935. if (state.funct["(breakage)"] === 0)
  27936. warning("W052", state.tokens.next, this.value);
  27937. }
  27938. reachable(this);
  27939. return this;
  27940. }).exps = true;
  27941. stmt("continue", function() {
  27942. var v = state.tokens.next.value;
  27943. if (state.funct["(breakage)"] === 0 || !state.funct["(loopage)"]) {
  27944. warning("W052", state.tokens.next, this.value);
  27945. }
  27946. if (state.tokens.next.identifier) {
  27947. if (sameLine(state.tokens.curr, state.tokens.next)) {
  27948. if (!state.funct["(scope)"].funct.hasLabel(v)) {
  27949. warning("W090", state.tokens.next, v);
  27950. }
  27951. this.first = state.tokens.next;
  27952. advance();
  27953. }
  27954. }
  27955. reachable(this);
  27956. return this;
  27957. }).exps = true;
  27958. stmt("return", function(context) {
  27959. if (sameLine(this, state.tokens.next)) {
  27960. if (state.tokens.next.id !== ";" && !state.tokens.next.reach) {
  27961. this.first = expression(context, 0);
  27962. if (this.first &&
  27963. this.first.type === "(punctuator)" && this.first.value === "=" &&
  27964. !this.first.paren && !state.option.boss) {
  27965. warning("W093", this.first);
  27966. }
  27967. if (state.option.noreturnawait && context & prodParams.async &&
  27968. !(context & prodParams.tryClause) &&
  27969. this.first.identifier && this.first.value === "await") {
  27970. warning("W146", this.first);
  27971. }
  27972. }
  27973. } else {
  27974. if (state.tokens.next.type === "(punctuator)" &&
  27975. ["[", "{", "+", "-"].indexOf(state.tokens.next.value) > -1) {
  27976. nolinebreak(this); // always warn (Line breaking error)
  27977. }
  27978. }
  27979. reachable(this);
  27980. return this;
  27981. }).exps = true;
  27982. prefix("await", function(context) {
  27983. if (context & prodParams.async) {
  27984. // If the parameters of the current function scope have not been defined,
  27985. // it is because the current expression is contained within the parameter
  27986. // list.
  27987. if (!state.funct["(params)"]) {
  27988. error("E024", this, "await");
  27989. }
  27990. expression(context, 10);
  27991. return this;
  27992. } else {
  27993. this.exps = false;
  27994. return state.syntax["(identifier)"].nud.apply(this, arguments);
  27995. }
  27996. }).exps = true;
  27997. (function(asyncSymbol) {
  27998. asyncSymbol.meta = { es5: true, isFutureReservedWord: true, strictOnly: true };
  27999. asyncSymbol.isFunc = function() {
  28000. var next = state.tokens.next;
  28001. var afterParens;
  28002. if (this.line !== next.line) {
  28003. return false;
  28004. }
  28005. if (next.id === "function") {
  28006. return true;
  28007. }
  28008. if (next.id === "(") {
  28009. afterParens = peekThroughParens(0);
  28010. return afterParens.id === "=>";
  28011. }
  28012. if (next.identifier) {
  28013. return peek().id === "=>";
  28014. }
  28015. return false;
  28016. };
  28017. asyncSymbol.useFud = asyncSymbol.isFunc;
  28018. // async function declaration
  28019. asyncSymbol.fud = function(context) {
  28020. if (!state.inES8()) {
  28021. warning("W119", this, "async functions", "8");
  28022. }
  28023. context |= prodParams.preAsync;
  28024. context |= prodParams.initial;
  28025. this.func = expression(context, 0);
  28026. this.block = this.func.block;
  28027. this.exps = this.func.exps;
  28028. return this;
  28029. };
  28030. asyncSymbol.exps = true;
  28031. delete asyncSymbol.reserved;
  28032. }(prefix("async", function(context, rbp) {
  28033. if (this.isFunc(context)) {
  28034. if (!state.inES8()) {
  28035. warning("W119", this, "async functions", "8");
  28036. }
  28037. context |= prodParams.preAsync;
  28038. this.func = expression(context, rbp);
  28039. this.identifier = false;
  28040. return this;
  28041. }
  28042. this.exps = false;
  28043. return state.syntax["(identifier)"].nud.apply(this, arguments);
  28044. })));
  28045. (function(yieldSymbol) {
  28046. yieldSymbol.rbp = yieldSymbol.lbp = 25;
  28047. yieldSymbol.exps = true;
  28048. })(prefix("yield", function(context) {
  28049. if (state.inMoz()) {
  28050. return mozYield.call(this, context);
  28051. }
  28052. if (!(context & prodParams.yield)) {
  28053. this.exps = false;
  28054. return state.syntax["(identifier)"].nud.apply(this, arguments);
  28055. }
  28056. var prev = state.tokens.prev;
  28057. // If the parameters of the current function scope have not been defined,
  28058. // it is because the current expression is contained within the parameter
  28059. // list.
  28060. if (!state.funct["(params)"]) {
  28061. error("E024", this, "yield");
  28062. }
  28063. if (!this.beginsStmt && prev.lbp > 30 && !checkPunctuators(prev, ["("])) {
  28064. error("E061", this);
  28065. }
  28066. if (!state.inES6()) {
  28067. warning("W104", state.tokens.curr, "yield", "6");
  28068. }
  28069. state.funct["(yielded)"] = true;
  28070. if (state.tokens.next.value === "*") {
  28071. advance("*");
  28072. }
  28073. // Parse operand
  28074. if (state.tokens.curr.value === "*" || sameLine(state.tokens.curr, state.tokens.next)) {
  28075. if (state.tokens.next.nud) {
  28076. nobreaknonadjacent(state.tokens.curr, state.tokens.next);
  28077. this.first = expression(context, 10);
  28078. if (this.first.type === "(punctuator)" && this.first.value === "=" &&
  28079. !this.first.paren && !state.option.boss) {
  28080. warning("W093", this.first);
  28081. }
  28082. } else if (state.tokens.next.led) {
  28083. if (state.tokens.next.id !== ",") {
  28084. error("W017", state.tokens.next);
  28085. }
  28086. }
  28087. }
  28088. return this;
  28089. }));
  28090. /**
  28091. * Parsing logic for non-standard Mozilla implementation of `yield`
  28092. * expressions.
  28093. */
  28094. var mozYield = function(context) {
  28095. var prev = state.tokens.prev;
  28096. if (state.inES6(true) && !(context & prodParams.yield)) {
  28097. error("E046", state.tokens.curr, "yield");
  28098. }
  28099. state.funct["(yielded)"] = true;
  28100. var delegatingYield = false;
  28101. if (state.tokens.next.value === "*") {
  28102. delegatingYield = true;
  28103. advance("*");
  28104. }
  28105. if (sameLine(this, state.tokens.next)) {
  28106. if (delegatingYield ||
  28107. (state.tokens.next.id !== ";" && !state.option.asi &&
  28108. !state.tokens.next.reach && state.tokens.next.nud)) {
  28109. nobreaknonadjacent(state.tokens.curr, state.tokens.next);
  28110. this.first = expression(context, 10);
  28111. if (this.first.type === "(punctuator)" && this.first.value === "=" &&
  28112. !this.first.paren && !state.option.boss) {
  28113. warning("W093", this.first);
  28114. }
  28115. }
  28116. if (state.tokens.next.id !== ")" &&
  28117. (prev.lbp > 30 || (!prev.assign && !isEndOfExpr()))) {
  28118. error("E050", this);
  28119. }
  28120. } else if (!state.option.asi) {
  28121. nolinebreak(this); // always warn (Line breaking error)
  28122. }
  28123. return this;
  28124. };
  28125. stmt("throw", function(context) {
  28126. nolinebreak(this);
  28127. this.first = expression(context, 20);
  28128. reachable(this);
  28129. return this;
  28130. }).exps = true;
  28131. prefix("import", function(context) {
  28132. var mp = metaProperty(context, "meta", function() {
  28133. if (!state.inES11(true)) {
  28134. warning("W119", state.tokens.prev, "import.meta", "11");
  28135. }
  28136. if (!state.option.module) {
  28137. error("E070", state.tokens.prev);
  28138. }
  28139. });
  28140. if (mp) {
  28141. return mp;
  28142. }
  28143. if (!checkPunctuator(state.tokens.next, "(")) {
  28144. return state.syntax["(identifier)"].nud.call(this, context);
  28145. }
  28146. if (!state.inES11()) {
  28147. warning("W119", state.tokens.curr, "dynamic import", "11");
  28148. }
  28149. advance("(");
  28150. expression(context, 10);
  28151. advance(")");
  28152. return this;
  28153. });
  28154. var importSymbol = stmt("import", function(context) {
  28155. if (!state.funct["(scope)"].block.isGlobal()) {
  28156. error("E053", state.tokens.curr, "Import");
  28157. }
  28158. if (!state.inES6()) {
  28159. warning("W119", state.tokens.curr, "import", "6");
  28160. }
  28161. if (state.tokens.next.type === "(string)") {
  28162. // ModuleSpecifier :: StringLiteral
  28163. advance("(string)");
  28164. return this;
  28165. }
  28166. if (state.tokens.next.identifier) {
  28167. // ImportClause :: ImportedDefaultBinding
  28168. this.name = identifier(context);
  28169. // Import bindings are immutable (see ES6 8.1.1.5.5)
  28170. state.funct["(scope)"].addbinding(this.name, {
  28171. type: "import",
  28172. initialized: true,
  28173. token: state.tokens.curr });
  28174. if (state.tokens.next.value === ",") {
  28175. // ImportClause :: ImportedDefaultBinding , NameSpaceImport
  28176. // ImportClause :: ImportedDefaultBinding , NamedImports
  28177. advance(",");
  28178. // At this point, we intentionally fall through to continue matching
  28179. // either NameSpaceImport or NamedImports.
  28180. // Discussion:
  28181. // https://github.com/jshint/jshint/pull/2144#discussion_r23978406
  28182. } else {
  28183. advance("from");
  28184. advance("(string)");
  28185. return this;
  28186. }
  28187. }
  28188. if (state.tokens.next.id === "*") {
  28189. // ImportClause :: NameSpaceImport
  28190. advance("*");
  28191. advance("as");
  28192. if (state.tokens.next.identifier) {
  28193. this.name = identifier(context);
  28194. // Import bindings are immutable (see ES6 8.1.1.5.5)
  28195. state.funct["(scope)"].addbinding(this.name, {
  28196. type: "import",
  28197. initialized: true,
  28198. token: state.tokens.curr });
  28199. }
  28200. } else {
  28201. // ImportClause :: NamedImports
  28202. advance("{");
  28203. for (;;) {
  28204. if (state.tokens.next.value === "}") {
  28205. advance("}");
  28206. break;
  28207. }
  28208. var importName;
  28209. if (peek().value === "as") {
  28210. identifier(context, true);
  28211. advance("as");
  28212. importName = identifier(context);
  28213. } else {
  28214. importName = identifier(context);
  28215. }
  28216. // Import bindings are immutable (see ES6 8.1.1.5.5)
  28217. state.funct["(scope)"].addbinding(importName, {
  28218. type: "import",
  28219. initialized: true,
  28220. token: state.tokens.curr });
  28221. if (state.tokens.next.value === ",") {
  28222. advance(",");
  28223. } else if (state.tokens.next.value === "}") {
  28224. advance("}");
  28225. break;
  28226. } else {
  28227. error("E024", state.tokens.next, state.tokens.next.value);
  28228. break;
  28229. }
  28230. }
  28231. }
  28232. // FromClause
  28233. advance("from");
  28234. advance("(string)");
  28235. // Support for ES2015 modules was released without warning for `import`
  28236. // declarations that lack bindings. Issuing a warning would therefor
  28237. // constitute a breaking change.
  28238. // TODO: enable this warning in JSHint 3
  28239. // if (hasBindings) {
  28240. // warning("W142", this, "import", moduleSpecifier);
  28241. // }
  28242. return this;
  28243. });
  28244. importSymbol.exps = true;
  28245. importSymbol.reserved = true;
  28246. importSymbol.meta = { isFutureReservedWord: true, es5: true };
  28247. importSymbol.useFud = function() {
  28248. return !(checkPunctuators(state.tokens.next, [".", "("]));
  28249. };
  28250. importSymbol.rbp = 161;
  28251. stmt("export", function(context) {
  28252. var ok = true;
  28253. var token;
  28254. var moduleSpecifier;
  28255. context = context | prodParams.export;
  28256. if (!state.inES6()) {
  28257. warning("W119", state.tokens.curr, "export", "6");
  28258. ok = false;
  28259. }
  28260. if (!state.funct["(scope)"].block.isGlobal()) {
  28261. error("E053", state.tokens.curr, "Export");
  28262. ok = false;
  28263. }
  28264. if (state.tokens.next.value === "*") {
  28265. // ExportDeclaration :: export * FromClause
  28266. // ExportDeclaration :: export * as IdentifierName FromClause
  28267. advance("*");
  28268. if (state.tokens.next.value === "as") {
  28269. if (!state.inES11()) {
  28270. warning("W119", state.tokens.curr, "export * as ns from", "11");
  28271. }
  28272. advance("as");
  28273. identifier(context, true);
  28274. state.funct["(scope)"].setExported(null, state.tokens.curr);
  28275. }
  28276. advance("from");
  28277. advance("(string)");
  28278. return this;
  28279. }
  28280. if (state.tokens.next.type === "default") {
  28281. // ExportDeclaration ::
  28282. // export default [lookahead ∉ { function, class }] AssignmentExpression[In] ;
  28283. // export default HoistableDeclaration
  28284. // export default ClassDeclaration
  28285. // because the 'name' of a default-exported function is, confusingly, 'default'
  28286. // see https://bocoup.com/blog/whats-in-a-function-name
  28287. state.nameStack.set(state.tokens.next);
  28288. advance("default");
  28289. var def = state.tokens.curr;
  28290. var exportType = state.tokens.next.id;
  28291. if (exportType === "function") {
  28292. this.block = true;
  28293. advance("function");
  28294. token = state.syntax["function"].fud(context);
  28295. state.funct["(scope)"].setExported(token.name, def);
  28296. } else if (exportType === "async" && peek().id === "function") {
  28297. this.block = true;
  28298. advance("async");
  28299. advance("function");
  28300. token = state.syntax["function"].fud(context | prodParams.preAsync);
  28301. state.funct["(scope)"].setExported(token.name, def);
  28302. } else if (exportType === "class") {
  28303. this.block = true;
  28304. advance("class");
  28305. token = state.syntax["class"].fud(context);
  28306. state.funct["(scope)"].setExported(token.name, def);
  28307. } else {
  28308. expression(context, 10);
  28309. state.funct["(scope)"].setExported(null, def);
  28310. }
  28311. return this;
  28312. }
  28313. if (state.tokens.next.value === "{") {
  28314. // ExportDeclaration :: export ExportClause
  28315. advance("{");
  28316. var exportedTokens = [];
  28317. while (!checkPunctuator(state.tokens.next, "}")) {
  28318. if (!state.tokens.next.identifier) {
  28319. /* istanbul ignore next */
  28320. error("E030", state.tokens.next, state.tokens.next.value);
  28321. }
  28322. advance();
  28323. if (state.tokens.next.value === "as") {
  28324. advance("as");
  28325. if (!state.tokens.next.identifier) {
  28326. /* istanbul ignore next */
  28327. error("E030", state.tokens.next, state.tokens.next.value);
  28328. }
  28329. exportedTokens.push({
  28330. local: state.tokens.prev,
  28331. export: state.tokens.next
  28332. });
  28333. advance();
  28334. } else {
  28335. exportedTokens.push({
  28336. local: state.tokens.curr,
  28337. export: state.tokens.curr
  28338. });
  28339. }
  28340. if (!checkPunctuator(state.tokens.next, "}")) {
  28341. advance(",");
  28342. }
  28343. }
  28344. advance("}");
  28345. if (state.tokens.next.value === "from") {
  28346. // ExportDeclaration :: export ExportClause FromClause
  28347. advance("from");
  28348. moduleSpecifier = state.tokens.next;
  28349. advance("(string)");
  28350. } else if (ok) {
  28351. exportedTokens.forEach(function(x) {
  28352. state.funct["(scope)"].setExported(x.local, x.export);
  28353. });
  28354. }
  28355. if (exportedTokens.length === 0) {
  28356. if (moduleSpecifier) {
  28357. warning("W142", this, "export", moduleSpecifier.value);
  28358. } else {
  28359. warning("W141", this, "export");
  28360. }
  28361. }
  28362. return this;
  28363. } else if (state.tokens.next.id === "var") {
  28364. // ExportDeclaration :: export VariableStatement
  28365. advance("var");
  28366. token = state.tokens.curr.fud(context);
  28367. token.first.forEach(function(binding) {
  28368. state.funct["(scope)"].setExported(binding, binding);
  28369. });
  28370. } else if (state.tokens.next.id === "let") {
  28371. // ExportDeclaration :: export VariableStatement
  28372. advance("let");
  28373. token = state.tokens.curr.fud(context);
  28374. token.first.forEach(function(binding) {
  28375. state.funct["(scope)"].setExported(binding, binding);
  28376. });
  28377. } else if (state.tokens.next.id === "const") {
  28378. // ExportDeclaration :: export VariableStatement
  28379. advance("const");
  28380. token = state.tokens.curr.fud(context);
  28381. token.first.forEach(function(binding) {
  28382. state.funct["(scope)"].setExported(binding, binding);
  28383. });
  28384. } else if (state.tokens.next.id === "function") {
  28385. // ExportDeclaration :: export Declaration
  28386. this.block = true;
  28387. advance("function");
  28388. token = state.syntax["function"].fud(context);
  28389. state.funct["(scope)"].setExported(token.name, token.name);
  28390. } else if (state.tokens.next.id === "async" && peek().id === "function") {
  28391. // ExportDeclaration :: export Declaration
  28392. this.block = true;
  28393. advance("async");
  28394. advance("function");
  28395. token = state.syntax["function"].fud(context | prodParams.preAsync);
  28396. state.funct["(scope)"].setExported(token.name, token.name);
  28397. } else if (state.tokens.next.id === "class") {
  28398. // ExportDeclaration :: export Declaration
  28399. this.block = true;
  28400. advance("class");
  28401. token = state.syntax["class"].fud(context);
  28402. state.funct["(scope)"].setExported(token.name, token.name);
  28403. } else {
  28404. /* istanbul ignore next */
  28405. error("E024", state.tokens.next, state.tokens.next.value);
  28406. }
  28407. return this;
  28408. }).exps = true;
  28409. /**
  28410. * Determine if SuperCall or SuperProperty may be used in the current context
  28411. * (as described by the provided "functor" object).
  28412. *
  28413. * @param {string} type - one of "property" or "call"
  28414. * @param {object} funct - a "functor" object describing the current function
  28415. * context
  28416. *
  28417. * @returns {boolean}
  28418. */
  28419. function supportsSuper(type, funct) {
  28420. if (type === "call" && funct["(async)"]) {
  28421. return false;
  28422. }
  28423. if (type === "property" && funct["(method)"]) {
  28424. return true;
  28425. }
  28426. if (type === "call" && funct["(statement)"] &&
  28427. funct["(statement)"].id === "class") {
  28428. return true;
  28429. }
  28430. if (funct["(arrow)"]) {
  28431. return supportsSuper(type, funct["(context)"]);
  28432. }
  28433. return false;
  28434. }
  28435. var superNud = function() {
  28436. var next = state.tokens.next;
  28437. if (checkPunctuators(next, ["[", "."])) {
  28438. if (!supportsSuper("property", state.funct)) {
  28439. error("E063", this);
  28440. }
  28441. } else if (checkPunctuator(next, "(")) {
  28442. if (!supportsSuper("call", state.funct)) {
  28443. error("E064", this);
  28444. }
  28445. } else {
  28446. error("E024", next, next.value || next.id);
  28447. }
  28448. return this;
  28449. };
  28450. // Future Reserved Words
  28451. FutureReservedWord("abstract");
  28452. FutureReservedWord("boolean");
  28453. FutureReservedWord("byte");
  28454. FutureReservedWord("char");
  28455. FutureReservedWord("double");
  28456. FutureReservedWord("enum", { es5: true });
  28457. FutureReservedWord("export", { es5: true });
  28458. FutureReservedWord("extends", { es5: true });
  28459. FutureReservedWord("final");
  28460. FutureReservedWord("float");
  28461. FutureReservedWord("goto");
  28462. FutureReservedWord("implements", { es5: true, strictOnly: true });
  28463. FutureReservedWord("int");
  28464. FutureReservedWord("interface", { es5: true, strictOnly: true });
  28465. FutureReservedWord("long");
  28466. FutureReservedWord("native");
  28467. FutureReservedWord("package", { es5: true, strictOnly: true });
  28468. FutureReservedWord("private", { es5: true, strictOnly: true });
  28469. FutureReservedWord("protected", { es5: true, strictOnly: true });
  28470. FutureReservedWord("public", { es5: true, strictOnly: true });
  28471. FutureReservedWord("short");
  28472. FutureReservedWord("static", { es5: true, strictOnly: true });
  28473. FutureReservedWord("synchronized");
  28474. FutureReservedWord("transient");
  28475. FutureReservedWord("volatile");
  28476. // this function is used to determine whether a squarebracket or a curlybracket
  28477. // expression is a comprehension array, destructuring assignment or a json value.
  28478. var lookupBlockType = function() {
  28479. var pn, pn1, prev;
  28480. var i = -1;
  28481. var bracketStack = 0;
  28482. var ret = {};
  28483. if (checkPunctuators(state.tokens.curr, ["[", "{"])) {
  28484. bracketStack += 1;
  28485. }
  28486. do {
  28487. prev = i === -1 ? state.tokens.curr : pn;
  28488. pn = i === -1 ? state.tokens.next : peek(i);
  28489. pn1 = peek(i + 1);
  28490. i = i + 1;
  28491. if (checkPunctuators(pn, ["[", "{"])) {
  28492. bracketStack += 1;
  28493. } else if (checkPunctuators(pn, ["]", "}"])) {
  28494. bracketStack -= 1;
  28495. }
  28496. if (bracketStack === 1 && pn.identifier && pn.value === "for" &&
  28497. !checkPunctuator(prev, ".")) {
  28498. ret.isCompArray = true;
  28499. ret.notJson = true;
  28500. break;
  28501. }
  28502. if (bracketStack === 0 && checkPunctuators(pn, ["}", "]"])) {
  28503. if (pn1.value === "=") {
  28504. ret.isDestAssign = true;
  28505. ret.notJson = true;
  28506. break;
  28507. } else if (pn1.value === ".") {
  28508. ret.notJson = true;
  28509. break;
  28510. }
  28511. }
  28512. if (checkPunctuator(pn, ";")) {
  28513. ret.notJson = true;
  28514. }
  28515. } while (bracketStack > 0 && pn.id !== "(end)");
  28516. return ret;
  28517. };
  28518. /**
  28519. * Update an object used to track property names within object initializers
  28520. * and class bodies. Produce warnings in response to duplicated names.
  28521. *
  28522. * @param {object} props - a collection of all properties of the object or
  28523. * class to which the current property is being
  28524. * assigned
  28525. * @param {string} name - the property name
  28526. * @param {object} tkn - the token defining the property
  28527. * @param {boolean} [isClass] - whether the accessor is part of an ES6 Class
  28528. * definition
  28529. * @param {boolean} [isStatic] - whether the accessor is a static method
  28530. * @param {boolean} [isComputed] - whether the property is a computed expression like [Symbol.iterator]
  28531. */
  28532. function saveProperty(props, name, tkn, isClass, isStatic, isComputed) {
  28533. if (tkn.identifier) {
  28534. name = tkn.value;
  28535. }
  28536. var key = name;
  28537. if (isClass && isStatic) {
  28538. key = "static " + name;
  28539. }
  28540. if (props[key] && name !== "__proto__" && !isComputed) {
  28541. var msg = ["key", "class method", "static class method"];
  28542. msg = msg[(isClass || false) + (isStatic || false)];
  28543. warning("W075", state.tokens.next, msg, name);
  28544. } else {
  28545. props[key] = Object.create(null);
  28546. }
  28547. props[key].basic = true;
  28548. props[key].basictkn = tkn;
  28549. }
  28550. /**
  28551. * Update an object used to track property names within object initializers
  28552. * and class bodies. Produce warnings in response to duplicated names.
  28553. *
  28554. * @param {string} accessorType - Either "get" or "set"
  28555. * @param {object} props - a collection of all properties of the object or
  28556. * class to which the current accessor is being
  28557. * assigned
  28558. * @param {object} tkn - the identifier token representing the accessor name
  28559. * @param {boolean} [isClass] - whether the accessor is part of an ES6 Class
  28560. * definition
  28561. * @param {boolean} [isStatic] - whether the accessor is a static method
  28562. */
  28563. function saveAccessor(accessorType, props, name, tkn, isClass, isStatic) {
  28564. var flagName = accessorType === "get" ? "getterToken" : "setterToken";
  28565. var key = name;
  28566. state.tokens.curr.accessorType = accessorType;
  28567. state.nameStack.set(tkn);
  28568. if (isClass && isStatic) {
  28569. key = "static " + name;
  28570. }
  28571. if (props[key]) {
  28572. if ((props[key].basic || props[key][flagName]) && name !== "__proto__") {
  28573. var msg = "";
  28574. if (isClass) {
  28575. if (isStatic) {
  28576. msg += "static ";
  28577. }
  28578. msg += accessorType + "ter method";
  28579. } else {
  28580. msg = "key";
  28581. }
  28582. warning("W075", state.tokens.next, msg, name);
  28583. }
  28584. } else {
  28585. props[key] = Object.create(null);
  28586. }
  28587. props[key][flagName] = tkn;
  28588. if (isStatic) {
  28589. props[key].static = true;
  28590. }
  28591. }
  28592. /**
  28593. * Parse a computed property name within object initializers and class bodies
  28594. * as introduced by ES2015. For example:
  28595. *
  28596. * void {
  28597. * [object.method()]: null
  28598. * };
  28599. *
  28600. * @param {number} context - the parsing context
  28601. *
  28602. * @returns {object} - the token value that describes the expression which
  28603. * defines the property name
  28604. */
  28605. function computedPropertyName(context) {
  28606. advance("[");
  28607. // Explicitly reclassify token as a delimeter to prevent its later
  28608. // interpretation as an "infix" operator.
  28609. state.tokens.curr.delim = true;
  28610. state.tokens.curr.lbp = 0;
  28611. if (!state.inES6()) {
  28612. warning("W119", state.tokens.curr, "computed property names", "6");
  28613. }
  28614. var value = expression(context & ~prodParams.noin, 10);
  28615. advance("]");
  28616. return value;
  28617. }
  28618. /**
  28619. * Test whether a given token is a punctuator whose `value` property matches
  28620. * one of the specified values. This function explicitly verifies the token's
  28621. * `type` property so that like-valued string literals (e.g. `";"`) do not
  28622. * produce false positives.
  28623. *
  28624. * @param {Token} token
  28625. * @param {Array.<string>} values
  28626. *
  28627. * @returns {boolean}
  28628. */
  28629. function checkPunctuators(token, values) {
  28630. if (token.type === "(punctuator)") {
  28631. return _.includes(values, token.value);
  28632. }
  28633. return false;
  28634. }
  28635. /**
  28636. * Test whether a given token is a punctuator whose `value` property matches
  28637. * the specified value. This function explicitly verifies the token's `type`
  28638. * property so that like-valued string literals (e.g. `";"`) do not produce
  28639. * false positives.
  28640. *
  28641. * @param {Token} token
  28642. * @param {string} value
  28643. *
  28644. * @returns {boolean}
  28645. */
  28646. function checkPunctuator(token, value) {
  28647. return token.type === "(punctuator)" && token.value === value;
  28648. }
  28649. // Check whether this function has been reached for a destructuring assign with undeclared values
  28650. function destructuringAssignOrJsonValue(context) {
  28651. // lookup for the assignment (ECMAScript 6 only)
  28652. // if it has semicolons, it is a block, so go parse it as a block
  28653. // or it's not a block, but there are assignments, check for undeclared variables
  28654. var block = lookupBlockType();
  28655. if (block.notJson) {
  28656. if (!state.inES6() && block.isDestAssign) {
  28657. /* istanbul ignore next */
  28658. warning("W104", state.tokens.curr, "destructuring assignment", "6");
  28659. }
  28660. statements(context);
  28661. // otherwise parse json value
  28662. } else {
  28663. state.option.laxbreak = true;
  28664. state.jsonMode = true;
  28665. jsonValue();
  28666. }
  28667. }
  28668. /**
  28669. * Parse and define the three states of a list comprehension in order to
  28670. * avoid defining global variables, but keeping them to the list
  28671. * comprehension scope only. The order of the states are as follows:
  28672. *
  28673. * - "use" - which will be the returned iterative part of the list
  28674. * comprehension
  28675. * - "define" - which will define the variables local to the list
  28676. * comprehension
  28677. * - "filter" - which will help filter out values
  28678. */
  28679. var arrayComprehension = function() {
  28680. var CompArray = function() {
  28681. this.mode = "use";
  28682. this.variables = [];
  28683. };
  28684. var _carrays = [];
  28685. var _current;
  28686. function declare(v) {
  28687. var l = _current.variables.filter(function(elt) {
  28688. // if it has, change its undef state
  28689. if (elt.value === v) {
  28690. elt.undef = false;
  28691. return v;
  28692. }
  28693. }).length;
  28694. return l !== 0;
  28695. }
  28696. function use(v) {
  28697. var l = _current.variables.filter(function(elt) {
  28698. // and if it has been defined
  28699. if (elt.value === v && !elt.undef) {
  28700. if (elt.unused === true) {
  28701. elt.unused = false;
  28702. }
  28703. return v;
  28704. }
  28705. }).length;
  28706. // otherwise we warn about it
  28707. return (l === 0);
  28708. }
  28709. return { stack: function() {
  28710. _current = new CompArray();
  28711. _carrays.push(_current);
  28712. },
  28713. unstack: function() {
  28714. _current.variables.filter(function(v) {
  28715. if (v.unused)
  28716. warning("W098", v.token, v.token.raw_text || v.value);
  28717. if (v.undef)
  28718. state.funct["(scope)"].block.use(v.value, v.token);
  28719. });
  28720. _carrays.splice(-1, 1);
  28721. _current = _carrays[_carrays.length - 1];
  28722. },
  28723. setState: function(s) {
  28724. if (_.includes(["use", "define", "generate", "filter"], s))
  28725. _current.mode = s;
  28726. },
  28727. check: function(v) {
  28728. if (!_current) {
  28729. return;
  28730. }
  28731. // When we are in "use" state of the list comp, we enqueue that var
  28732. if (_current && _current.mode === "use") {
  28733. if (use(v)) {
  28734. _current.variables.push({
  28735. token: state.tokens.curr,
  28736. value: v,
  28737. undef: true,
  28738. unused: false
  28739. });
  28740. }
  28741. return true;
  28742. // When we are in "define" state of the list comp,
  28743. } else if (_current && _current.mode === "define") {
  28744. // check if the variable has been used previously
  28745. if (!declare(v)) {
  28746. _current.variables.push({
  28747. token: state.tokens.curr,
  28748. value: v,
  28749. undef: false,
  28750. unused: true
  28751. });
  28752. }
  28753. return true;
  28754. // When we are in the "generate" state of the list comp,
  28755. } else if (_current && _current.mode === "generate") {
  28756. state.funct["(scope)"].block.use(v, state.tokens.curr);
  28757. return true;
  28758. // When we are in "filter" state,
  28759. } else if (_current && _current.mode === "filter") {
  28760. // we check whether current variable has been declared
  28761. if (use(v)) {
  28762. // if not we warn about it
  28763. /* istanbul ignore next */
  28764. state.funct["(scope)"].block.use(v, state.tokens.curr);
  28765. }
  28766. return true;
  28767. }
  28768. /* istanbul ignore next */
  28769. return false;
  28770. }
  28771. };
  28772. };
  28773. /**
  28774. * Parse input according to the JSON format.
  28775. *
  28776. * http://json.org/
  28777. */
  28778. function jsonValue() {
  28779. function jsonObject() {
  28780. var o = {}, t = state.tokens.next;
  28781. advance("{");
  28782. if (state.tokens.next.id !== "}") {
  28783. for (;;) {
  28784. if (state.tokens.next.id === "(end)") {
  28785. error("E026", state.tokens.next, t.line);
  28786. } else if (state.tokens.next.id === "}") {
  28787. warning("W094", state.tokens.curr);
  28788. break;
  28789. } else if (state.tokens.next.id === ",") {
  28790. error("E028", state.tokens.next);
  28791. } else if (state.tokens.next.id !== "(string)") {
  28792. warning("W095", state.tokens.next, state.tokens.next.value);
  28793. }
  28794. if (o[state.tokens.next.value] === true) {
  28795. warning("W075", state.tokens.next, "key", state.tokens.next.value);
  28796. } else if ((state.tokens.next.value === "__proto__" &&
  28797. !state.option.proto) || (state.tokens.next.value === "__iterator__" &&
  28798. !state.option.iterator)) {
  28799. warning("W096", state.tokens.next, state.tokens.next.value);
  28800. } else {
  28801. o[state.tokens.next.value] = true;
  28802. }
  28803. advance();
  28804. advance(":");
  28805. jsonValue();
  28806. if (state.tokens.next.id !== ",") {
  28807. break;
  28808. }
  28809. advance(",");
  28810. }
  28811. }
  28812. advance("}");
  28813. }
  28814. function jsonArray() {
  28815. var t = state.tokens.next;
  28816. advance("[");
  28817. if (state.tokens.next.id !== "]") {
  28818. for (;;) {
  28819. if (state.tokens.next.id === "(end)") {
  28820. error("E027", state.tokens.next, t.line);
  28821. } else if (state.tokens.next.id === "]") {
  28822. warning("W094", state.tokens.curr);
  28823. break;
  28824. } else if (state.tokens.next.id === ",") {
  28825. error("E028", state.tokens.next);
  28826. }
  28827. jsonValue();
  28828. if (state.tokens.next.id !== ",") {
  28829. break;
  28830. }
  28831. advance(",");
  28832. }
  28833. }
  28834. advance("]");
  28835. }
  28836. switch (state.tokens.next.id) {
  28837. case "{":
  28838. jsonObject();
  28839. break;
  28840. case "[":
  28841. jsonArray();
  28842. break;
  28843. case "true":
  28844. case "false":
  28845. case "null":
  28846. case "(number)":
  28847. case "(string)":
  28848. advance();
  28849. break;
  28850. case "-":
  28851. advance("-");
  28852. advance("(number)");
  28853. break;
  28854. default:
  28855. error("E003", state.tokens.next);
  28856. }
  28857. }
  28858. /**
  28859. * Lint dynamically-evaluated code, appending any resulting errors/warnings
  28860. * into the global `errors` array.
  28861. *
  28862. * @param {array} internals - collection of "internals" objects describing
  28863. * string tokens that contain evaluated code
  28864. * @param {object} options - linting options to apply
  28865. * @param {object} globals - globally-defined bindings for the evaluated code
  28866. */
  28867. function lintEvalCode(internals, options, globals) {
  28868. var priorErrorCount, idx, jdx, internal;
  28869. for (idx = 0; idx < internals.length; idx += 1) {
  28870. internal = internals[idx];
  28871. options.scope = internal.elem;
  28872. priorErrorCount = JSHINT.errors.length;
  28873. itself(internal.code, options, globals);
  28874. for (jdx = priorErrorCount; jdx < JSHINT.errors.length; jdx += 1) {
  28875. JSHINT.errors[jdx].line += internal.token.line - 1;
  28876. }
  28877. }
  28878. }
  28879. var escapeRegex = function(str) {
  28880. return str.replace(/[-\/\\^$*+?.()|[\]{}]/g, "\\$&");
  28881. };
  28882. // The actual JSHINT function itself.
  28883. var itself = function(s, o, g) {
  28884. var x, reIgnoreStr, reIgnore;
  28885. var optionKeys, newOptionObj, newIgnoredObj;
  28886. o = _.clone(o);
  28887. state.reset();
  28888. newOptionObj = state.option;
  28889. newIgnoredObj = state.ignored;
  28890. if (o && o.scope) {
  28891. JSHINT.scope = o.scope;
  28892. } else {
  28893. JSHINT.errors = [];
  28894. JSHINT.internals = [];
  28895. JSHINT.blacklist = {};
  28896. JSHINT.scope = "(main)";
  28897. }
  28898. predefined = Object.create(null);
  28899. combine(predefined, vars.ecmaIdentifiers[3]);
  28900. combine(predefined, vars.reservedVars);
  28901. declared = Object.create(null);
  28902. var exported = Object.create(null); // Variables that live outside the current file
  28903. function each(obj, cb) {
  28904. if (!obj)
  28905. return;
  28906. if (!Array.isArray(obj) && typeof obj === "object")
  28907. obj = Object.keys(obj);
  28908. obj.forEach(cb);
  28909. }
  28910. if (o) {
  28911. each([o.predef, o.globals], function(dict) {
  28912. each(dict, function(item) {
  28913. var slice, prop;
  28914. if (item[0] === "-") {
  28915. slice = item.slice(1);
  28916. JSHINT.blacklist[slice] = slice;
  28917. // remove from predefined if there
  28918. delete predefined[slice];
  28919. } else {
  28920. prop = Object.getOwnPropertyDescriptor(dict, item);
  28921. predefined[item] = prop ? prop.value : false;
  28922. }
  28923. });
  28924. });
  28925. each(o.exported || null, function(item) {
  28926. exported[item] = true;
  28927. });
  28928. delete o.predef;
  28929. delete o.exported;
  28930. optionKeys = Object.keys(o);
  28931. for (x = 0; x < optionKeys.length; x++) {
  28932. if (/^-W\d{3}$/g.test(optionKeys[x])) {
  28933. newIgnoredObj[optionKeys[x].slice(1)] = true;
  28934. } else {
  28935. var optionKey = optionKeys[x];
  28936. newOptionObj[optionKey] = o[optionKey];
  28937. }
  28938. }
  28939. }
  28940. state.option = newOptionObj;
  28941. state.ignored = newIgnoredObj;
  28942. state.option.indent = state.option.indent || 4;
  28943. state.option.maxerr = state.option.maxerr || 50;
  28944. indent = 1;
  28945. var scopeManagerInst = scopeManager(state, predefined, exported, declared);
  28946. scopeManagerInst.on("warning", function(ev) {
  28947. warning.apply(null, [ ev.code, ev.token].concat(ev.data));
  28948. });
  28949. scopeManagerInst.on("error", function(ev) {
  28950. /* istanbul ignore next */
  28951. error.apply(null, [ ev.code, ev.token ].concat(ev.data));
  28952. });
  28953. state.funct = functor("(global)", null, {
  28954. "(global)" : true,
  28955. "(scope)" : scopeManagerInst,
  28956. "(comparray)" : arrayComprehension(),
  28957. "(metrics)" : createMetrics(state.tokens.next)
  28958. });
  28959. functions = [state.funct];
  28960. member = {};
  28961. membersOnly = null;
  28962. inblock = false;
  28963. lookahead = [];
  28964. if (!isString(s) && !Array.isArray(s)) {
  28965. errorAt("E004", 0);
  28966. return false;
  28967. }
  28968. api = {
  28969. get isJSON() {
  28970. /* istanbul ignore next */
  28971. return state.jsonMode;
  28972. },
  28973. getOption: function(name) {
  28974. return state.option[name] || null;
  28975. },
  28976. getCache: function(name) {
  28977. return state.cache[name];
  28978. },
  28979. setCache: function(name, value) {
  28980. state.cache[name] = value;
  28981. },
  28982. warn: function(code, data) {
  28983. warningAt.apply(null, [ code, data.line, data.char ].concat(data.data));
  28984. },
  28985. on: function(names, listener) {
  28986. names.split(" ").forEach(function(name) {
  28987. emitter.on(name, listener);
  28988. }.bind(this));
  28989. }
  28990. };
  28991. emitter.removeAllListeners();
  28992. (extraModules || []).forEach(function(func) {
  28993. func(api);
  28994. });
  28995. state.tokens.prev = state.tokens.curr = state.tokens.next = state.syntax["(begin)"];
  28996. if (o && o.ignoreDelimiters) {
  28997. if (!Array.isArray(o.ignoreDelimiters)) {
  28998. /* istanbul ignore next */
  28999. o.ignoreDelimiters = [o.ignoreDelimiters];
  29000. }
  29001. o.ignoreDelimiters.forEach(function(delimiterPair) {
  29002. if (!delimiterPair.start || !delimiterPair.end)
  29003. return;
  29004. reIgnoreStr = escapeRegex(delimiterPair.start) +
  29005. "[\\s\\S]*?" +
  29006. escapeRegex(delimiterPair.end);
  29007. reIgnore = new RegExp(reIgnoreStr, "ig");
  29008. s = s.replace(reIgnore, function(match) {
  29009. return match.replace(/./g, " ");
  29010. });
  29011. });
  29012. }
  29013. lex = new Lexer(s);
  29014. lex.on("warning", function(ev) {
  29015. warningAt.apply(null, [ ev.code, ev.line, ev.character].concat(ev.data));
  29016. });
  29017. lex.on("error", function(ev) {
  29018. errorAt.apply(null, [ ev.code, ev.line, ev.character ].concat(ev.data));
  29019. });
  29020. lex.on("fatal", function(ev) {
  29021. quit("E041", ev);
  29022. });
  29023. lex.on("Identifier", function(ev) {
  29024. emitter.emit("Identifier", ev);
  29025. });
  29026. lex.on("String", function(ev) {
  29027. emitter.emit("String", ev);
  29028. });
  29029. lex.on("Number", function(ev) {
  29030. emitter.emit("Number", ev);
  29031. });
  29032. // Check options
  29033. var name;
  29034. for (name in o) {
  29035. if (_.has(o, name)) {
  29036. checkOption(name, true, state.tokens.curr);
  29037. }
  29038. }
  29039. if (o) {
  29040. for (name in o.unstable) {
  29041. if (_.has(o.unstable, name)) {
  29042. checkOption(name, false, state.tokens.curr);
  29043. }
  29044. }
  29045. }
  29046. try {
  29047. applyOptions();
  29048. // combine the passed globals after we've assumed all our options
  29049. combine(predefined, g || {});
  29050. //reset values
  29051. checkComma.first = true;
  29052. advance();
  29053. switch (state.tokens.next.id) {
  29054. case "{":
  29055. case "[":
  29056. destructuringAssignOrJsonValue(0);
  29057. break;
  29058. default:
  29059. directives();
  29060. if (state.directive["use strict"]) {
  29061. if (!state.allowsGlobalUsd()) {
  29062. warning("W097", state.directive["use strict"]);
  29063. }
  29064. }
  29065. statements(0);
  29066. }
  29067. if (state.tokens.next.id !== "(end)") {
  29068. quit("E041", state.tokens.curr);
  29069. }
  29070. state.funct["(scope)"].unstack();
  29071. } catch (err) {
  29072. if (err && err.name === "JSHintError") {
  29073. var nt = state.tokens.next || {};
  29074. JSHINT.errors.push({
  29075. scope : "(main)",
  29076. raw : err.raw,
  29077. code : err.code,
  29078. reason : err.reason,
  29079. line : err.line || nt.line,
  29080. character : err.character || nt.from
  29081. });
  29082. } else {
  29083. /* istanbul ignore next */
  29084. throw err;
  29085. }
  29086. }
  29087. // Loop over the listed "internals", and check them as well.
  29088. if (JSHINT.scope === "(main)") {
  29089. lintEvalCode(JSHINT.internals, o || {}, g);
  29090. }
  29091. return JSHINT.errors.length === 0;
  29092. };
  29093. // Modules.
  29094. itself.addModule = function(func) {
  29095. extraModules.push(func);
  29096. };
  29097. itself.addModule(style.register);
  29098. // Data summary.
  29099. itself.data = function() {
  29100. var data = {
  29101. functions: [],
  29102. options: state.option
  29103. };
  29104. var fu, f, i, n, globals;
  29105. if (itself.errors.length) {
  29106. data.errors = itself.errors;
  29107. }
  29108. if (state.jsonMode) {
  29109. /* istanbul ignore next */
  29110. data.json = true;
  29111. }
  29112. var impliedGlobals = state.funct["(scope)"].getImpliedGlobals();
  29113. if (impliedGlobals.length > 0) {
  29114. data.implieds = impliedGlobals;
  29115. }
  29116. globals = state.funct["(scope)"].getUsedOrDefinedGlobals();
  29117. if (globals.length > 0) {
  29118. data.globals = globals;
  29119. }
  29120. for (i = 1; i < functions.length; i += 1) {
  29121. f = functions[i];
  29122. fu = {};
  29123. fu.name = f["(name)"];
  29124. fu.param = f["(params)"];
  29125. fu.line = f["(line)"];
  29126. fu.character = f["(character)"];
  29127. fu.last = f["(last)"];
  29128. fu.lastcharacter = f["(lastcharacter)"];
  29129. fu.metrics = {
  29130. complexity: f["(metrics)"].ComplexityCount,
  29131. parameters: f["(metrics)"].arity,
  29132. statements: f["(metrics)"].statementCount
  29133. };
  29134. data.functions.push(fu);
  29135. }
  29136. var unuseds = state.funct["(scope)"].getUnuseds();
  29137. if (unuseds.length > 0) {
  29138. data.unused = unuseds;
  29139. }
  29140. for (n in member) {
  29141. if (typeof member[n] === "number") {
  29142. data.member = member;
  29143. break;
  29144. }
  29145. }
  29146. return data;
  29147. };
  29148. itself.jshint = itself;
  29149. return itself;
  29150. }());
  29151. // Make JSHINT a Node module, if possible.
  29152. if (typeof exports === "object" && exports) {
  29153. exports.JSHINT = JSHINT;
  29154. }
  29155. },{"./lex.js":17,"./messages.js":18,"./options.js":20,"./prod-params.js":21,"./reg.js":22,"./scope-manager.js":23,"./state.js":24,"./style.js":25,"./vars.js":27,"console-browserify":9,"events":11,"lodash":12}]},{},[]);
  29156. JSHINT = require('jshint').JSHINT;
  29157. if (typeof exports === 'object' && exports) exports.JSHINT = JSHINT;
  29158. }());