RE: Conditional generation of Grammar rules

[Ramaswamy R - TLS, Chennai.]

Why don't you just rewrite the same this way ... it seems much simpler to
me.

nonterminal X:
{
#ifdef FEATURE
  rule1;
#else
  rule1; rule2;
#endif
}

would it be a problem for you to write it this way?? Or is your problem much
bigger than what I just addressed.

Regards
Ramaswamy

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Jeganatan, Srividhya
Sent: Tuesday, May 02, 2006 10:08 PM
To: 'address@hidden'
Subject: Conditional generation of Grammar rules

All,
Is there a way to conditionally generate grammar rules? 
For example, I need to do something like

nonterminal X:
#ifdef FEATURE
 { rule 1 }
#else
 { rule 1; rule 2 }
#endif

I know that ifdefs dont work with the grammar but is there anything else
that can be done?
Or is it possible to make bison to read define variables from a make file?

I want to avoid writing different parsers / recursive parsers to do this.

Thanks for your help.

Srividhya.




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