How do I build ANTLR 3 grammars with import using Gradle?

0
votes

I have a base grammar (FooBase.g) and two grammar that include it:

lexer grammar FooVariantA;
import base = FooBase;
...

lexer grammar FooVariantB;
import base = FooBase;
...

If I put all three files into src/main/antlr, the base grammar is compiled and this of course fails: it shouldn't be compiled, because it refers to some rules that are only defined in the "final" FooVariantA and FooVariantB grammars.

However, it seems I also cannot create src/main/antlr/imports subdirectory as with Maven, as Gradle ANTLR plugin never looks there:

error(7): cannot find or open file: FooBase.g; reason: java.io.FileNotFoundException: /home/test/test/src/main/antlr/FooBase.g (No such file or directory)

How can I make only the two final grammars compile and still be able to find the imported base grammar?

1
gradleantlr

1 Answers

1
votes

Turns out to be as simple as this:

generateGrammarSource {
    exclude ('**/*Base.g')
}