How to add package declaration for antlr3 generated classes using ant? - ant

Question

My build.xml looks like following:
<property name="lib" value="${basedir}/lib" />
<property name="src" value="${basedir}/src" />
<property name="package" value="com/package/antlr" />
<path id="compile.classpath">
<fileset dir="${lib}">
<include name="antlr-3.5-complete.jar" />
</fileset>
</path>
<!-- Check if ANTLR3 can be found in the classpath -->
<target name="antlr_classpath">
<whichresource property="antlr.in.classpath" class="org.antlr.Tool">
<classpath>
<path refid="compile.classpath" />
</classpath>
</whichresource>
<fail message="ANTLR3 not found in CLASSPATH">
<condition>
<not>
<isset property="antlr.in.classpath" />
</not>
</condition>
</fail>
<echo>ANTLR3 found via CLASSPATH</echo>
</target>
<!-- Antlr3 is called here -->
<target name="antlr" depends="antlr_classpath">
<java classname="org.antlr.Tool" fork="true" failonerror="true">
<classpath>
<path refid="compile.classpath" />
</classpath>
<arg value="-verbose" />
<arg value="-make"/>
<arg value="-o" />
<arg path="${src}/${package}" />
<arg path="${src}/${package}/BoolExpr.g" />
</java>
</target>
It generates BoolExprLexer.java and BoolExprParser.java in folder /src/com/package/antlr, which is what i want, but files generated belong to default package. How can I make'em part of com.package.antlr?

Answer 1

ANTLR 3
For a lexer grammar or parser grammar, add the following to your grammar file:
#header {
package com.package.antlr;
}
For a combined grammar (lexer and parser in the same grammar file), add the following to your grammar file:
#lexer::header {
package com.package.antlr;
}
#parser::header {
package com.package.antlr;
}
ANTLR 4
Pass the following argument to the ANTLR tool when you generate your lexer/parser from the grammar:
-package com.package.antlr
This can be done during an Ant build by adding the following two lines to your build script:
<arg value="-package"/>
<arg value="com.package.antlr" />