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<h2><a name="javacc">MParse</a></h2>
<h3>Requirements</h3>
<p>This task requires Metamata Development environment 1.1. It does not work as
is with the latest 2.0 version freely available at <a href="http://www.metamata.com">Metamata</a>.</p>
<h3>Description</h3> 
<p>
  Invokes the Metamata <a HREF="http://www.metamata.com/parse.html">MParse</a> compiler 
  compiler on a grammar file.
</p>
<p>
  To use the <i>mparse</i> task, set the <i>target</i> attribute to the name of the 
  grammar file to process.  You also need to specify the directory containing 
  the Metamata installation using the <i>metamatahome</i> attribute, so that Ant 
  can find the MParse classes.
</p>
<p>
  This task only invokes MParse if the grammar file is newer than the generated 
  Java files. MParse assumes that the Java class name of the generated parser
  is the same as the name of the grammar file, less the .jj extension.
</p>

<p>For additional information about MParse, please consult the online manual available <a href="http://download.metamata.com/parse.pdf">here</a>
(PDF)
</p>

<h3>Parameters</h3>
<table border="1" cellpadding="2" cellspacing="0">
  <tr>
    <td valign="top"><b>Attribute</b></td>
    <td valign="top"><b>Description</b></td>
    <td align="center" valign="top"><b>Required</b></td>
  </tr>
  <tr>
    <td valign="top">target</td>
    <td valign="top">The .jj grammar file to process. It will only be processed
      if the grammar is newer than the corresponding .java file.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">metamatahome</td>
    <td valign="top">The home directory containing the Metamata distribution.</td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">workingdir</td>
    <td valign="top">
      The temporary directory used by MParse.
    </td>
    <td valign="top" align="center">Yes</td>
  </tr>
  <tr>
    <td valign="top">cleanuphack</td>
    <td valign="top">Remove the stale file as well as the intermediate Sun
      JavaCC file created during the transformation of the grammar file.</td>
    <td valign="top" align="center">No. Default to false.</td>
  </tr>
</table>
<h3>Nested elements</h3>
<h4>userclasspath</h4>
<p>&nbsp;The <tt>userclasspath</tt> element is required and represents a <a href="index.html#path">PATH like
structure</a>.</p>
<h3>Example</h3>
<pre>  &lt;mparse target=&quot;src/Parser.jj&quot; metamatahome=&quot;c:/metamata&quot; workingdir=&quot;c:/tmp&quot;&gt;
    &lt;userclasspath&gt;
      &lt;pathelement location=&quot;./lib/dependency.jar&quot;/&gt;
    &lt;/userclasspath&gt;
  &lt;/mparse&gt;</pre>
<p>
  This invokes Metamata MParse installed in <tt>c:/metamata</tt> on a grammar file <tt>src/Parser.jj</tt>
with a working directory in <tt>c:/tmp</tt> and a specific classpath
</p>
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