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   <title>JJTree Task</title>
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<h2>
<a NAME="jjtree"></a>JJTree</h2>

<h3>
Description</h3>
Invokes the <a href="http://www.webgain.com/products/java_cc/">JJTree</a> preprocessor
for the JavaCC compiler compiler. It inserts parse tree building actions
at various places in the JavaCC source that it generates. The output of
JJTree is run through JavaCC to create the parser.
<p>To use the jjtree task, set the <i>target</i> attribute to the name
of the jjtree grammar file to process. You also need to specify the directory
containing the JavaCC installation using the <i>javacchome</i> attribute,
so that ant can find the JavaCC classes. Optionally, you can also set the
<i>outputdirectory</i>
to write the generated file to a specific directory. Otherwise jjtree writes
the generated JavaCC grammar file to the directory containing the JJTree
grammar file.</p>
<p>This task only invokes JJTree if the grammar file is newer than the
generated JavaCC file.</p>

<h3>Parameters</h3>

<table BORDER CELLSPACING=0 CELLPADDING=2 >
<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 jjtree grammar file to process.</td>

<td ALIGN=CENTER VALIGN=TOP>Yes</td>
</tr>

<tr>
<td VALIGN=TOP>javacchome</td>

<td VALIGN=TOP>The directory containing the JavaCC distribution.</td>

<td ALIGN=CENTER VALIGN=TOP>Yes</td>
</tr>

<tr>
<td VALIGN=TOP>outputdirectory</td>

<td VALIGN=TOP>The directory to write the generated file to. If not set,
the files are written to the directory containing the grammar file.&nbsp;</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>buildnodefiles</td>

<td VALIGN=TOP>Sets the BUILD_NODE_FILES grammar option. This is a boolean
option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>multi</td>

<td VALIGN=TOP>Sets the MULTI grammar option. This is a boolean option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>nodedefaultvoid</td>

<td VALIGN=TOP>Sets the NODE_DEFAULT_VOID grammar option. This is a boolean
option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>nodefactory</td>

<td VALIGN=TOP>Sets the NODE_FACTORY grammar option. This is boolean option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>nodescopehook</td>

<td VALIGN=TOP>Sets the NODE_SCOPE_HOOK grammar option. This is a boolean
option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>nodeusesparser</td>

<td VALIGN=TOP>Sets the NODE_USES_PARSER grammar option. This is a boolean
option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>static</td>

<td VALIGN=TOP>Sets the STATIC grammar option. This is a boolean option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>visitor</td>

<td VALIGN=TOP>Sets the VISITOR grammar option. This is a boolean option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>nodepackage</td>

<td VALIGN=TOP>Sets the NODE_PACKAGE grammar option. This is a string option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>visitorexception</td>

<td VALIGN=TOP>Sets the VISITOR_EXCEPTION grammar option. This is a string
option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>

<tr>
<td VALIGN=TOP>nodeprefix</td>

<td VALIGN=TOP>Sets the NODE_PREFIX grammar option. This is a string option.</td>

<td ALIGN=CENTER VALIGN=TOP>No</td>
</tr>
</table>

<h3>
Example</h3>

<blockquote>
<pre>&lt;jjtree&nbsp;
&nbsp;&nbsp;&nbsp; target="src/Parser.jjt"&nbsp;
&nbsp;&nbsp;&nbsp; outputdirectory="build/src"
&nbsp;&nbsp;&nbsp; javacchome="c:/program files/JavaCC"&nbsp;
&nbsp;&nbsp;&nbsp; nodeusesparser="true"
/></pre>
</blockquote>
This invokes JJTree on grammar file src/Parser.jjt, writing the generated
grammar file, Parser.jj, file to build/src. The grammar option NODE_USES_PARSER
is set to true when invoking JJTree.
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