[antlr-interest] ANTLR 3 rewrite rule syntax

[Shmuel Siegel]

To my surprise, I am coming to like the rewrite rules better than the
grammar markups; more power and better separation between grammar and
output.  I do have some syntax questions.

 

Consider 

rule : A? B (id+)=C*

 

I know that I can write -> A? MYTOKEN[$B] $id*

 

But how can I make private tokens from "A" and "C". Ultimately "C" can
be handled by a subrule but how do I issue a conditional token in my
rewrite. MYTOKEN[$A?] and MYTOKEN[$A]? don't seem to work.

 

Shmuel

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