[antlr-interest] Syntactic predicate for single alternatives

[Prashant Deva]

> At the program rule I think statement2 is an alternative to statement1 in
> the following construct:  (statement1)* statement2
>
No, statement2 is not an alternative in this case. It just follows
statement1. Which is why you get the syntactic predicate ignored warning,
cause there is no need for it.

To make statement2 an alternative, write  the rule like this -




program
    :
        (DO THIS)=>  (statement1)*

        | (statement2)?
    ;

Notice the '|' operator which separates 2 alternatives.

--
Prashant Deva
Creator, ANTLR Studio
Founder, Placid Systems, www.placidsystems.com
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