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- <a name="Filter-Mode-Options-1"></a>
- <h2 class="section">1.3 Filter Mode Options</h2>
- <p>The options available in filter mode are listed below. Except as
- otherwise noted, all options are mutually exclusive. Ordinarily a
- given application will require certain fixed settings of these options
- and will not work properly if they are set inappropriately.
- </p>
- <dl compact="compact">
- <dt> <code>-r, <code>--raw-output</code></code></dt>
- <dd><a name="index-raw_002doutput-command-line-option"></a>
- <p>Normally the result obtained by evaluating the function in the virtual
- code file must be a list of character strings, which is written as
- such to standard output. However, if this option is selected, the form
- of the result is unconstrained, and it will be written in a data file
- format that is not human readable but can be used by other
- applications. This option is incompatible with any other options
- except ‘<samp>-u</samp>’.
- </p></dd>
- <dt> <code>-c, --choice-of-output</code></dt>
- <dd><a name="index-choice_002dof_002doutput-command-line-option"></a>
- <p>When this option is used, the evaluation of the function given by the
- virtual machine code will be expected to yield a data structure from
- which <code>avram</code> will ascertain whether standard output should be
- written in text or raw data format. This option should be used only
- if application is aware of it. It is incompatible with any other options
- except ‘<samp>-u</samp>’.
- </p></dd>
- <dt> <code>-l, --line-map</code></dt>
- <dd><a name="index-line_002dmap-command-line-option"></a>
- <p>Normally the entire contents of standard input up to <code>EOF</code> are
- loaded into memory and used as the argument to the function in the
- virtual code file. However, this option causes standard input to be read
- a line at a time, with the function applied individually to each line,
- and its result in each case written immediately to standard output. A
- given application either requires this option or does not, and will not
- work properly in the alternative. This option implies
- ‘<samp>--force-text-input</samp>’ and is incompatible with any other option except
- ‘<samp>-u</samp>’.
- </p></dd>
- <dt> <code>-b, --byte-transducer</code></dt>
- <dd><a name="index-byte_002dtransducer-command-line-option"></a>
- <p>This option causes standard input to be read one character at a time,
- evaluating the function given by the virtual code file each time. The
- function is used as a state transition function that takes a state and
- input to a next state and output. The output is written concurrently
- with the input operations. A given application will not work properly
- with an inappropriate setting of this option. This option implies
- ‘<samp>--force-text-input</samp>’ and is incompatible with any other option
- except ‘<samp>-u</samp>’.
- </p></dd>
- <dt> <code>-u, --unparameterized</code></dt>
- <dd><a name="index-unparameterized-command-line-option"></a>
- <p>Normally <code>avram</code> guesses whether to use filter mode or parameter
- mode depending on whether there are any parameters. Selecting this
- option forces it to operate in filter mode regardless. Any parameters
- that may appear on the command line after the virtual code file name
- are ignored. This option may be used in conjunction with any other
- filter mode option.
- </p></dd>
- </dl>
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