[antlr-interest] Problems with semantic predicates

[Jim Idle]

> -----Original Message-----
> From: antlr-interest-bounces at antlr.org [mailto:antlr-interest-
> bounces at antlr.org] On Behalf Of Thomas Brandon


> But if as your example suggests you just want to alter the AST
> construction not the actual parsing then I think you want predicated
> rewrite rules not semantic predicates (as I believe Jim was suggesting
> though I think he gave the wrong syntax). Like:
> r2[boolean flag]
>  : Token1
>    -> {$flag}? ^(NODE Token1)
>    -> Token1
>  ;

Yep - I just copied Gavin's suggestion and forgot to correct the position of the -> even though that was what I was actually replying to the post for. Doh!

Jim
 

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