Re: passing down value of terminal

[Hans Aberg]

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




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