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

[Anthony Youngman]

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 ... :-)

My treeparser is as follows:

programst
	:	#(PROGRAM (IDENT)? statement_list END) 
	|	#(SUBROUTINE (IDENT)? (formalargs)? statement_list END) 
	|	#(FUNCTION (IDENT)? (formalargs)? statement_list END) 
	;

deffunst
	: #(DEFFUN IDENT (formalargs)? (CALLING (IDENT |
STRING_LITERAL))? )
	;

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


And, as an example, I want the second line of programst to be
	|	#(SUBROUTINE (IDENT)? (formalargs)?
{st.write(argcount);} statement_list END) 
Obviously, I need to initialise it to 0 before formalargs gets called,
so that I've got a valid value to pass to st.write. I think I can get
round it by doing s/(formalargs)?/(formalargs{st.write(0);})/ and
putting an st.write in the formalargs rule, but I need to learn how to
pass results from rules ...

Cheers,
Wol


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