[antlr-interest] Newbie question

[Ric Klaren]

On Fri, Apr 16, 2004 at 07:15:37PM -0000, Andres Chaves wrote:
> postfixExpr
{ int num_args = 0; }
> 	:	(id:ID LPAREN)=>
> 		id2:ID^
> 		(
>          parenArgs
       num_args=parenArgs
> 		)?
   {
     // pseudo code...	
      int expected_args = lookupsym(id2->getText())->numArgs();
      if( expected_args != num_args )
         throw SemanticException()		
   }	
> 	|	atom
> 	;

And change parenArgs to something like:

parenArgs [returns int num_args = 0] :
"(" ( arg { num_args++; } ) ")" ;

> I have to detect when the number of arguments is wrong (for example 
> sin() or sin(a,b)), and raise a parser exception, when i parse the 
> function (not when im calculating).
> 
> I wonder if someone could give some advice about how to do this.

Making it all java/or C++ is left to the reader ;) This is the gist of it
anyway.

Cheers,

Ric
-- 
-----+++++*****************************************************+++++++++-------
    ---- Ric Klaren ----- j.klaren at utwente.nl ----- +31 53 4893722  ----
-----+++++*****************************************************+++++++++-------
     "Evil will always triumph, because Good is dumb." ---  Spaceballs



 
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