Re: passing down value of terminal

[Hans Aberg]

[Please keep the CC to Help-Bison, so other knows what is going on.]

I don't recall how, but I think one might put it in the beginning of  
the parser function, so tha the function then becomes pure.

But try:
  ID '.' complex {
    if( strcmp($1.value,"this") == 0)
      doThis();
    else
      doThat();
   }
 ;

  Hans Aberg


On 22 Nov 2006, at 21:18, vlad florentino wrote:

> "You can still put it into the parser function, so that it is global
> to the parser, but not the parser function. But try putting in the
> first rule."
>
> I'm sorry, but I don't understand your last comment very well. did  
> you really mean this:
> "...so that it is global to the parser function, but not the  
> [whole] parser."
>
> Does that mean I'll edit the yacc.m4 file (which I'm doing already)?
>
> What do you mean by "try putting in the first rule"
>
>
> On 11/22/06, Hans Aberg <address@hidden> wrote: You can still  
> put it into the parser function, so that it is global
> to the parser, but not the parser function. But try putting in the
> first rule.
>
>    Hans Aberg
>
>
> On 22 Nov 2006, at 20:23, vlad florentino wrote:
>
> > I guess the global variable is the best choice, then. I was trying
> > to avoid global variables because I was hoping the make the parser
> > reentrant. I guess that's out the window.
> >
> > Thanks for the help.
> >
> >
> > On 11/22/06, Hans Aberg <address@hidden> wrote: On 22 Nov 2006,
> > at 19:41, vlad florentino wrote:
> >
> > > In gnu bison:
> > >
> > > I have a couple of productions of this type:
> > > ID '.' complex
> > >  : {...}
> > >  ;
> > >
> > > complex
> > >  : FOOBAR  {...}
> > >  ;
> > >
> > > How can I pass the value of ID, a terminal, down to the production
> > > 'complex', a non terminal. I would like to determine what's the
> > > value of ID
> > > and take actions based on that, i.e.:
> > >  complex
> > >  : FOOBAR
> > >  {
> > >    if( strcmp(ID.value,"this") == 0)
> > >      doThis();
> > >    else
> > >      doThat();
> > >   }
> >
> > You can't within the parser itself, as it is a bottom-up parser; so
> > some trick is needed. So either use variable global to the  
> parser, or
> > write it in the action of the first rule you have above (using $1).
> > You might also attempt using negative $k numbers (perhaps $-1 in  
> your
> > case), but that is tricky: for one, thing, it will break if you
> > variable "complex" is used in some other context.
> >
> >    Hans Aberg
> >
> >
> >