[antlr-interest] AST Tree generation question

[Roberto Attias]

In an expression grammar derived from one of the examples I have the 
following rule:

additive_expression
    : (multiplicative_expression) ('+^' multiplicative_expression | '-'^ 
multiplicative_expression)*
    ;

When parsing a+b", this generates a tree as expected. Now ,I want to 
have OP_ADD or OP_SUB as radix of the tree when evaluating a+b or a-b. 
I'm not entirely sure how to do that. Is there a way to indicate that a 
different token should be used in the inlined syntax? If not, how to do 
this with rewrite rules?

I've tried different combinations, but can't get this to work...

   Thanks,

                 Roberto 
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