Re: 2 grammars, 1 lexer

[Dan Haggarty]

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