[antlr-interest] beta6, alternation produces non compiling code.

[Dr. Kocher, Hartmut]

The problem is with lexer vs. parser rules: Lexer rules are upper case. Parser rules are lower case. ELEM must be a lexer rule. Therefore, it must be named starting with an upper case letter. List is a parser rule. Therefore it must be lower case. That's why your first approach doesn't work.

Hope this helps

Dr. Hartmut Kocher
Cortex Brainware

-----Ursprüngliche Nachricht-----
Von: antlr-interest-bounces at antlr.org [mailto:antlr-interest-bounces at antlr.org] Im Auftrag von Johannes Luber
Gesendet: Mittwoch, 28. Februar 2007 12:06
An: antlr-interest at antlr.org
Betreff: Re: [antlr-interest] beta6, alternation produces non compiling code.

Hello!

I'm wondering myself, if I miss something, but

> Grammar list;
> 
> list : ELEM (COMMA ELEM)* ;
> 
> COMMA : ',' ;
> ELEM : 'a'..'z' | 'A'..'Z'  ;

doesn't look different to me than

> list.g:
> ------
> grammar list;
> list : elem (',' elem)* ;
> elem : 'a'..'z'|'A'..'Z' ;
> ------

(unless you count the COMMA). Why doesn't work the latter?

Best regards,
Johannes Luber



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