> From: "Alan Lehotsky" <[email protected]>
> Date: January 17, 2011 4:40:02 PM EST
> To: [email protected]
> Subject: [antlr-interest] collecting tokens without invoking parser rules...
>
>
> Using Antlr 3.2 with language=C as a target
>
> For parsing Teradata's stored-procedure language (SPL), we have the issue
> of context-sensitive token hiding.
>
> I'm trying to use rules for SQL statements embedded in SPL that just
> swallow the tokens, so we have rules like:
>
>
> swallow_to_semi : ~ ( SEMI ) * ;
>
> update_stmt : UPDATE swallow_to_semi;
>
> .......
> This feels like something that should be relatively easy to do, but I
> don't seem to be able to figure out exactly how to make it happen and I
> haven't hit upon the right search terms to find an appropriate example in
> the Antlr-interest archives or the Wiki.
Answering my own question...
It turns out that I was trying TOO hard to make this work. This simple rule
seems to completely resolve
the problems I was having:
swallow_to_semi :
( { LT(1)->getType(LT(1)) != SEMI }?.)+
i.e. collect any token that ISN'T a SEMI. Not sure why the original rule
didn't do exactly the same thing, but this
doesnt get confused by trying to do any parser-rule reductions on the token
stream.
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