[antlr-interest] ast rewrite rule beginner question...

[Gavin Lambert]

At 16:11 26/12/2008, Jim Idle wrote:
>Just use:
>
>expression
>     :   conditionalOrExpression (assignmentOperator^ 
> expression)?
>
>         ;

Or the explicit form:

expression
   : ( a=conditionalOrExpression -> $a )
     ( o=assignmentOperator b=expression -> ^($o $a $b) )?
   ;

(Note that for either of these to work, assignmentOperator must 
match exactly one token.)