[antlr-interest] Optional tokens

[hammett]

Hiya!

----- Original Message ----- 
From: "John B. Brodie" <jbb at acm.org>

> Do you really expect that:
>
>    x ; , ; y ; = ; 1 ; , ; 2
>
> would parse to the same AST as:
>
>    x, y = 1, 2

Call me a dreamer! :-D

> you did say that SEMI is to be totally ignored anywhere except at the
> end of a statement...
>
> and so just where does a statement end anyway? (answering this may
> lead you to the answer of your original question)

I'm more concerned with NEWLINE... answering your question, I did:

statement:
    :
    (
      declarationStmt
      |
      compoundStmt
      |
      expressionStmt
    )
    (SEMI!|NEWLINE!)
    ;

But having NEWLINE as a real token obligates me to deal with it everywhere, 
that's the bottom line problem...

Thanks,

-- 
Cheers,
hammett
http://www.castleproject.org/~hammett