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Re: push parser

From: Bob Rossi
Subject: Re: push parser
Date: Thu, 6 Apr 2006 11:27:24 -0400
User-agent: Mutt/1.5.9i

On Thu, Apr 06, 2006 at 05:16:36PM +0200, Akim Demaille wrote:
> >>> "Bob" == Bob Rossi <address@hidden> writes:
>  > I added the %push-parser option, so that a bison input grammar file can
>  > ask for itself to be a push-parser.
> What should Bison knows about this?  is it just a means to select the
> right skeleton, or it actually changes something for bison itself?

It is exactly like %pure-parser. It does not select a different
skeleton. In fact, %pure-parser uses the yacc.c skeleton.

I put m4 conditionals in yacc.c, and if %pure-parser is set, yacc.c 
outputs a pure parser. This mostly means that yacc.c creates a struct
with all the variables that yyparse needs, and that yyparse does
'pv->yychar' instead of 'yychar'.

Bob Rossi

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