[antlr-interest] backtrack=false and AST generation
Giampaolo Tomassoni
Giampaolo at Tomassoni.biz
Sun Apr 18 09:03:47 PDT 2010
> I do not know why you get the undefined label error.
>
> Have you considered not using a sub-rule for the then-else part?
>
> Something like:
>
> expression :
> conditionalOrExpression (QMARK^ expression COMMA! expression) ?
> ;
>
> or if you really want ITE as the root (instead of QMARK) perhaps:
>
> expresssion :
> ( c=conditionalOrExpression -> $c )
> ( QMARK t=expression COMMA f=expression-> ^(ITE $c $t $f) )?
> ;
>
>
> Hope this helps...
> -jbb
It helped a lot.
I was quite sure to get a non-LLR grammar that way, but now I see I have backtrack=false and still antlr doesn't complains...
Thank you, John.
Giampaolo
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