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<title>MParse Task</title>
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<h2><a name="mparse">MParse</a></h2>
<p>by</p>
<ul>
  <li>Stephane Bailliez (<a href="mailto:sbailliez@imediation.com">sbailliez@imediation.com</a>)</li>
</ul>
<h3>Requirements</h3>
<p>This task requires Metamata Development environment 2.0 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">verbose</td>
    <td valign="top">
      Enable all messages
    </td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">debugparser</td>
    <td valign="top">
      Enables parser debugging
    </td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">debugscanner</td>
    <td valign="top">
      Enables scanner debugging
    </td>
    <td valign="top" align="center">No</td>
  </tr>
  <tr>
    <td valign="top">cleanup</td>
    <td valign="top">Remove 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>
  <tr>
    <td valign="top">maxmemory</td>
    <td valign="top">Set the maximum memory for the JVM. this is a convenient
      way to set the -mx or -Xmx argument.</td>
    <td valign="top" align="center">No</td>
  </tr>
</table>
<h3>Nested elements</h3>
<h4>jvmarg</h4>
<p>Additional parameters may be passed to the VM via nested <code>&lt;jvmarg&gt;</code>
attributes. <code>&lt;jvmarg&gt;</code> allows all attributes described in <a href="../using.html#arg">Command
line arguments</a>.</p>
<h4>classpath</h4>
<p>Sets class path (also source path unless one explicitly set). Overrides
METAPATH/CLASSPATH environment variables. &nbsp;The <tt>classpath</tt> element represents a <a href="../using.html#path">PATH like
structure</a>.</p>
<h4>sourcepath</h4>
<p>Sets source path. Overrides the SOURCEPATH environment variable.&nbsp;The <tt>sourcepath</tt> element represents a <a href="../using.html#path">PATH like
structure</a>.</p>
<h3>Example</h3>
<pre>  &lt;mparse target=&quot;c:/metamata/examples/parseexamples/javagrammars/singlefile/JavaParser.jj&quot;
          metamatahome=&quot;c:/metamata&quot; cleanup=&quot;true&quot;&gt;
    &lt;classpath&gt;
      &lt;pathelement location=&quot;c:/metamata/examples/&quot;/&gt;
    &lt;/classpath&gt;
  &lt;/mparse&gt;</pre>
<p>
  This invokes Metamata MParse installed in <tt>c:/metamata</tt> on one of the grammar file
example <tt>(JavaParser.jj)</tt>
 and cleans up the intermediate Sun JavaCC file.
</p>
<hr>
<p align="center">Copyright &copy; 2001,2004 The Apache Software Foundation. All rights
Reserved.</p>
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