I have been given an ANTLR grammar for a subset of the Java compiler known as the static Java compiler. I am trying to extend the grammar to include more of Java's features, for instance, I just added the grammar for For Loops.
Using Eclipse and an ANTLR plugin, I then did 'Compile ANTLR grammar'. Instead of compiling it produced two errors on the first bit of code:
grammar ExtendedStaticJava;
options { backtrack=true; memoize=true; }
@header
{
package sjc.parser.extended;
import java.math.BigInteger;
/**
* Extended StaticJava parser.
* @author <myname>
*/
}
// the rest of the grammar has been excluded.
The first error is on line 1: 'Unexpected Token: grammar' The second error is on line 5: 'Unexpected char: @'
Why does it not recognize this basic ANTLR syntax? My first thought was that I was missing something in the classpath, but I went to the project's properties and made sure that the following JARs were included under Libraries:
Any ideas or suggestions?
antlr-2.7.7.jar is wrong: your grammar is in ANTLR v3+ syntax. Remove all:
from your project/classpath and only stick this ANTLR v3 JAR in it (which contains everything you need: runtime, stringtemplate, the works!).
Good luck!
Personally, I do my IDE integration with an Ant build script. I generate a lexer and parser like this:
<target name="generate.parser" depends="init" description="Generates the lexer, parser and tree-walker from the grammar files.">
<echo>Generating the lexer and parser...</echo>
<java classname="org.antlr.Tool" fork="true" failonerror="true">
<arg value="-fo" />
<arg value="${main.src.dir}/${parser.package}" />
<arg value="${parser.grammar.file}" />
<classpath refid="classpath" />
</java>
<!-- snip -->
</target>
and the classpath refid looks like:
<path id="classpath">
<!-- snip -->
<fileset dir="lib">
<include name="*.jar" />
</fileset>
</path>
and the lib/ directory contains the ANTLR v3 JAR (no other ANTLR JARs! (sorry for hammering on that :)))