[antlr-interest] New Maven artifact for compiling antlr grammars

[Jim Idle]

On Fri, 2008-12-05 at 11:47 -0800, Howard Lewis Ship wrote:

> I'm having a problem; I need to split my grammar into a lexer grammar
> and a parser grammar so I can specify a superClass option for the
> lexer grammar.
> 
> My source files are
> src/main/antlr/org/apache/tapestry5/internal/antlr/PropertyTokens.g
> and PropertyExpression.g.
> 
> The plugin generates a PropertyTokens.tokens file as
> target/generated-sources/antlr/org/apache/tapestry5/internal/antlr/PropertyTokens.token
> 
> So far, so good.
> 
> However, in my PropertyExpression.g file I've tried
> 
> options { tokenVocab=PropertyTokens; }
> 
> and
> 
> options {
>   tokenVocab="org/apache/tapestry5/internal/antlr/PropertyTokens";
> }
> 
> and both fail.  The first should work, but gets:
> 
> [INFO] [antlr3:antlr {execution: default}]
> org/apache/tapestry5/internal/antlr/PropertyTokens.g
> org/apache/tapestry5/internal/antlr/PropertyExpression.g
> [ERROR] error(3):  cannot find tokens file
> /Users/Howard/work/tapestry5/tapestry-core/target/generated-sources/antlr/PropertyTokens.tokens


If you are using an IDE like Netbeans, then when you edit pom.xml, and
type a '<' inside the configuration, you will see that it gives you all
the options. In this case, as your grammar files are in a package, it
cannot infer the lib directory. So you need:

            <plugin>
                <groupId>org.antlr</groupId>
                <artifactId>antlr3-maven-plugin</artifactId>
                <version>3.1.1.2</version>

                <configuration>

<libDirectory>${basedir}/target/generated-sources/antlr/org/apache/tapestry5/internal/antlr</libDirectory>
                </configuration>

                <executions>

                    <execution>
                        <goals>
                            <goal>antlr</goal>
                        </goals>
                    </execution>
                    
                </executions>

            </plugin>

I was playing with trying to make the plugin perform a better guess for
the lib directory and may come up with something yet, but for now, you
must specify it if it is not antlr/

Jim
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