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<title>ANTLR Task</title>
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<h2 id="antlr">ANTLR</h2>
<h3>Description</h3>
<p>Invokes the <a href="https://www.antlr.org/" target="_top">ANTLR</a> Translator generator on a
grammar file.</p>
<p>To use the ANTLR task, set the <var>target</var> attribute to the name of the grammar file to
process.  Optionally, you can also set the <var>outputdirectory</var> to write the generated file to
a specific directory.  Otherwise ANTLR writes the generated files to the directory containing the
grammar file.</p>
<p>This task only invokes ANTLR if the grammar file (or the supergrammar specified by
the <var>glib</var> attribute) is newer than the generated files.</p>
<p><strong>Note</strong>: This task depends on external libraries not included in the Apache Ant
distribution. See <a href="../install.html#librarydependencies">Library Dependencies</a> for more
information.</p>
<p>Antlr 2.7.2 Note: <em>You will need <samp>antlrall.jar</samp> that can be created by
the <q>antlr-all.jar</q> target of the Makefile provided with the download.</em></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 grammar file to process.</td>
    <td>Yes</td>
  </tr>
  <tr>
    <td>outputdirectory</td>
    <td>The directory to write the generated files to.</td>
    <td>No; defaults to the directory containing the grammar file</td>
  </tr>
  <tr>
    <td>glib</td>
    <td>An optional super grammar file that the target grammar overrides.  This feature is only
      needed for advanced vocabularies.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>debug</td>
    <td>When set to <q>yes</q>, this flag adds code to the generated parser that will launch the
      ParseView debugger upon invocation.<br/>  Note: ParseView is a separate component that needs
      to be installed or your grammar will have compilation errors.</td>
    <td>No; default is <q>no</q></td>
  </tr>
  <tr>
    <td>html</td>
    <td>Emit an HTML version of the grammar with hyperlinked actions if set to <q>yes</q>.</td>
    <td>No; default is <q>no</q></td>
  </tr>
  <tr>
    <td>diagnostic</td>
    <td>Generate a text file with debugging information based on the target grammar if set
      to <q>yes</q>.</td>
    <td>No; default is <q>no</q></td>
  </tr>
  <tr>
    <td>trace</td>
    <td>Force <strong>all</strong> rules to call traceIn/traceOut if set to <q>yes</q>.</td>
    <td>No; default is <q>no</q></td>
  </tr>
  <tr>
    <td>traceParser</td>
    <td>Only force parser rules to call traceIn/traceOut if set to <q>yes</q>.</td>
    <td>No; default is <q>no</q></td>
  </tr>
  <tr>
    <td>traceLexer</td>
    <td>Only force lexer rules to call traceIn/traceOut if set to <q>yes</q>.</td>
    <td>No; default is <q>no</q></td>
  </tr>
  <tr>
    <td>traceTreeWalker</td>
    <td>Only force tree walker rules to call traceIn/traceOut if set to <q>yes</q>.</td>
    <td>No; default is <q>no</q></td>
  </tr>
  <!--tr>
    <td>fork</td>
    <td>Run ANTLR in a separate JVM.</td>
    <td>No; default is <q>off</q></td>
  </tr-->
  <tr>
    <td>dir</td>
    <td>The directory to invoke JVM in.<!--(ignored if fork is disabled)--></td>
    <td>No</td>
  </tr>
</table>

<h3 id="nested">Parameters specified as nested elements</h3>

<p>The task supports a nested <code>&lt;classpath&gt;</code> element, that represents
a <a href="../using.html#path">path-like structure</a>. It is given as a convenience if you have to
specify the original ANTLR directory. In most cases, dropping the appropriate ANTLR jar in the
normal Ant lib repository will be enough.</p>

<h4>jvmarg</h4>

<p><!--If fork is enabled, -->Additional parameters may be passed to the new JVM via
nested <code>&lt;jvmarg&gt;</code> attributes, for example:</p>

<pre>
&lt;antlr target="..."&gt;
  &lt;jvmarg value=&quot;-Djava.compiler=NONE&quot;/&gt;
  ...
&lt;/antlr&gt;</pre>

<p>would run ANTLR in a JVM without JIT.</p>

<p><code>&lt;jvmarg&gt;</code> allows all attributes described
in <a href="../using.html#arg">Command line arguments</a>.</p>

<h3>Example</h3>
<p>Invoke ANTLR on grammar file <samp>etc/java.g</samp>, writing the generated files
to <samp>build/src</samp>:</p>
<pre>
&lt;antlr
    target=&quot;etc/java.g&quot;
    outputdirectory=&quot;build/src&quot;/&gt;</pre>

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