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<title>JJDoc Task</title>
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<h2 id="jjtree">JJDoc</h2>
<p><em>Since Apache Ant 1.6</em></p>
<h3>Description</h3>

<p>Invokes the <a href="https://javacc.org/" target="_top">JJDoc</a> preprocessor for the JavaCC
compiler compiler. It takes a JavaCC parser specification and produces documentation for the BNF
grammar.  It can operate in three modes, determined by command line options.
<p>To use the <code>jjdoc</code> task, set the <var>target</var> attribute to the name of the JavaCC
grammar file to process. You also need to specify the directory containing the JavaCC installation
using the <var>javacchome</var> attribute, so that Ant can find the JavaCC classes. Optionally, you
can also set the <var>outputfile</var> to write the generated BNF documentation file to a specific
(directory and) file.  Otherwise <code>jjdoc</code> writes the generated BNF documentation file as
the JavaCC grammar file with a suffix <samp>.txt</samp> or <samp>.html</samp>.</p>
<p>This task only invokes <code>JJDoc</code> if the grammar file is newer than the generated BNF
documentation file.</p>

<h3>Parameters</h3>

<table class="attr">
<tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
</tr>

<tr>
    <td>target</td>
    <td>The JavaCC grammar file to process.</td>
    <td>Yes</td>
</tr>

<tr>
    <td>javacchome</td>
    <td>The directory containing the JavaCC distribution.</td>
    <td>Yes</td>
</tr>

<tr>
    <td>outputfile</td>
    <td>The file to write the generated BNF documentation file to. If not set, the file is written
      with the same name as the JavaCC grammar file but with a the suffix <samp>.html</samp>
      or <samp>.txt</samp></td>
    <td>No</td>
</tr>

<tr>
    <td>text</td>
    <td>Sets the TEXT BNF documentation option. This is a boolean option.</td>
    <td>No</td>
</tr>

<tr>
    <td>onetable</td>
    <td>Sets the ONE_TABLE BNF documentation option. This is a boolean option.</td>
    <td>No</td>
</tr>
<tr>
    <td>maxmemory</td>
    <td>Max amount of memory to allocate to the forked JVM.  <em>since Ant 1.8.3</em></td>
    <td>No</td>
  </tr>
</table>

<h3>Example</h3>

<p>Invoke JJDoc on grammar file <samp>src/Parser.jj</samp>, writing the generated BNF documentation
file, <samp>ParserBNF.html</samp>, to <samp>doc</samp>.</p>

<pre>
&lt;jjdoc target="src/Parser.jj"
       outputfile="doc/ParserBNF.html"
       javacchome="c:/program files/JavaCC"/&gt;</pre>

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