RE: 2 grammars, 1 lexer

[Xinan Tang]

Hi 

  However one has to put two grammars into ONE file; otherwise BISON
will generate token numbers starting from 257 for both grammars.

--Xinan

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of Dan
Haggarty
Sent: Wednesday, February 11, 2004 5:54 PM
To: address@hidden
Subject: Re: 2 grammars, 1 lexer

At 12:00 PM 2/11/04, wim delvaux wrote:
>On Wednesday 11 February 2004 17:34, Urdaneta, Alfonso E (N-Summitt
>Technologies) wrote:
> > stupid question, but...
> >
> > Is it possible to have two grammars assocated with one lexer ?
>
>         Sure, use the reentrant lexer and pass it to both parsers.
You 
> might have a
>problem with tokens though

Alternatively, use two start states with your lexer (one per grammer),
two 
sets of disjoint token names, and an initial grammar rule that depends
on 
the first token read.  (See the O'Reilly "Lex & Yacc" book for details.)

Dan



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