Generating ANTLR classes from Ant

Added: April 29, 2010

Tags: ANTLR DSL book hint

I am in the middle or reading Domain Specific Languages by Martin Fowler and I have started to experiment with ANTLR today. After copy&pasting of example and fixing a few problems I wanted to generate a parser from grammar. I wanted to use following Ant snippet taken from Ant documentation (Rough Cuts of the book does not show how to do that):

	<target name="generate" depends="prepare">
		<antlr target="${dir.antlr.src}/Greetings.g" outputdirectory="${dir.gen}" />
But regardless of my experiments ANTLR process invoked from Ant always ended with Unable to determine generated class. Googling did not help. I found many questions, but no solution. Finally I settled on a following workaround, based on standalone generation of sources from the grammar:
	<target name="generate" depends="prepare">
		<java jar="lib/antlr-3.2.jar" fork="true">
			 <arg value="-o"/>
			 <arg value="${dir.gen}"/>
			 <arg value="${dir.antlr.src}/Greetings.g"/>
This does the trick. Now back to the example to see what it does.

Number of comments: 3
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