[antlr-interest] Getting the exceptions caught in nextToken()

[Guntis Ozols]

Not sure if it fits you, I use something like this:

// Error handling (do not recover).
// This part sucks, I'd prefer to call stopOnError(true) from API
// NOTE: Throwing in lexer also means: disable antlrworks debugger and lexer
syntactic predicates, Oh my dear...
@lexer::members {
public void reportError(RecognitionException e) {
    // API does not allow to throw e from here, throwing RuntimeException
instead
    throw new RuntimeException("Lexing recognition problem", e);
}
}

@members {
protected void mismatch(IntStream input, int ttype, BitSet follow)
        throws RecognitionException {
    throw new MismatchedTokenException(ttype, input);
}
public void recoverFromMismatchedSet(IntStream input, RecognitionException e,
BitSet follow)
        throws RecognitionException {
    throw e;
}
}

@rulecatch {
    catch (RecognitionException e) {
        throw e;
    }
}


> Currently it seems the nextToken() method in the base lexer class can
> not be forced to throw exceptions on to the parser (or anything else)
> -- instead the lexer is catching them and printing error messages to
> stderr. How can these exceptions be thrown back to the parser so they
> can be used?
>
> Thanks,
> Andreas