Hi,



How do we extend our own defined Parser?

Take this sample myParser.g:

			

			class myParser extends Parser {
			

			options { importVocab=myLexer; }
			

			...
			

			isATag {} : "TAG" {}
			

			( t:NUMBER { _counter++; } )+
			

			END;
			

			}
			

		

I would like to extend myParser to provide a new isATag method. Here is myExtParser.g:

			

			class myExtParser extends myParser {
			

			options { importVocab=myLexer; }
			

			...
			

			isATag {} : "TAG" {}
			

			( t:NUMBER { _counter += 2; } )+
			

			END;
			

			}
			

		

I do not want to do it directly in Java, I prefer to use another .g file to implement myExtParser class to minimize maintenance.

The problem is when I try to generate myExtParser.java, I got an error:

error: grammar myParser not defined