[antlr-interest] parser backtrack issue

[Ashish]

On Jan 18, 2008 6:59 PM, Gavin Lambert <antlr at mirality.co.nz> wrote:

> At 15:44 19/01/2008, Ashish wrote:
> >I defined boolean expressions as
> >booleanExpressions
> >      :  booleanExpression ( BOOLEAN_OR  booleanExpression )*
> >      |  booleanExpression ( BOOLEAN_AND booleanExpression )*
>
> That's only going to match a chain of ANDs or a chain or ORs.  It
> won't match a mixed sequence of ANDs and ORs, for example.  You
> probably want this:
>
> booleanExpressions
>   :  booleanExpression ((BOOLEAN_OR | BOOLEAN_AND)
> booleanExpression)*
>   ;
>
> Or this:
>
> booleanExpressions
>   :  booleanExpression
>      ( BOOLEAN_OR booleanExpressions
>      | BOOLEAN_AND booleanExpressions
>      )?
>   ;
>
>

That is what I want ! Thanks for pointing that out.
-Ashish
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