[antlr-interest] Accessing a return value ...

[Ric Klaren]

On Thu, May 27, 2004 at 03:33:50PM +0100, Anthony Youngman wrote:
> I've looked in the manual, and it tells me how to return a value, but
> not how to get at that value from the calling rule (at least as far as I
> can see ... :-)
> 

programst { int val; } :
      #(PROGRAM (IDENT)? statement_list END) 
   |  #(SUBROUTINE (IDENT)? (val=formalargs)? statement_list END) 
   |  #(FUNCTION (IDENT)? (val=formalargs)? statement_list END) 
   ;
 
> deffunst
> 	: #(DEFFUN IDENT (formalargs)? (CALLING (IDENT |
> STRING_LITERAL))? )
> 	;
> 
> formalargs returns [int argcount]
> 	: #(FORMALARGS (IDENT {argcount++;})+ )

In C++ you can do:

formalargs returns [int argcount = 0]
 	: #(FORMALARGS (IDENT {argcount++;})+ )
	;

Not 100% sure if java works like that too.

But this might work as well:

formalargs returns [int argcount] { argcount = 0; } :
   #(FORMALARGS (IDENT {argcount++;})+ )
   ;

Cheers,

Ric
-- 
-----+++++*****************************************************+++++++++-------
    ---- Ric Klaren ----- j.klaren at utwente.nl ----- +31 53 4893755  ----
-----+++++*****************************************************+++++++++-------
  "I think we better split up."
  "Good idea. We can do more damage that way."
  --- Ghostbusters



 
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