[antlr-interest] conditional processing

[Gerald B. Rosenberg]

At 07:02 PM 11/26/2007, Mark Volkmann wrote:
>Part of my AST looks like this.
>
>^('if' condition simpleStatement)

Would help to see the full rule and the condition rule.  Still, a 
possible solution is to use a semantic predicate, something like:

^('if' b=condition { $b.equals("true") }? simpleStatement)


>In my tree grammar, the rule for "condition" evaluates the matching
>content to true or false. The rule for "simpleStatement" executes the
>statement, for example, it could be a simple print statement. I only
>want simpleStatement to be executed if condition evaluates to true. I
>haven't been able to figure out how to make this work because when
>this part of my AST is matched, the rules for both condition and
>simpleStatement are fired.
>
>I'd appreciate any hints on how to achieve this.
>
>--
>R. Mark Volkmann
>Object Computing, Inc.

----
Gerald B. Rosenberg, Esq.
NewTechLaw
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Palo Alto, CA  94306-2009

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www.newtechlaw.com


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