Re: Reading parser stack

[Mike Aubury]

Something like :


A: B C D {
      printf("The identifier was: %s", $2);
 }
| B E D {
      printf("It wasn't an identifier...");
}
;





2009/4/29 Mark Redd <address@hidden>

> Hello everybody,
> I would like to receive an hint about reading parser stack.
>
> Suppose my (fantasy) bison grammar is this:
>
> %start A
>
> A : B C D | B E D
>
> B: ID
> C: '*'
> D:  IDENTIFIER
> E: '-'
>
> where IDENTIFIER has been defined like [a-zA-Z0-9]+ using flex.
>
> How can I print "the identifier was: %s" when C matches (but not when E
> does
> it) without rewriting the grammar?
> In particular, I need to know what I have to write in
> C: '*'        { printf("The identifier was: %s", ?????); }
>
> Note that it isn't my very problem, but it's a model of this and so I'd
> like
> a general answer. So I can't modify my grammar and I don't want to read
> only
> the last token in parser, but sometimes I'm interested in reading the last
> n
> tokens.
>
> Thank you!
> Mark Redd
> _______________________________________________
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>