[antlr-interest] Can someone please explain

[Balvinder Singh]

Hi..

 Use syntactic predicate like this

 (A(B)?)=>A(B)?

It will remove the warnings but I'm not sure about run time behaviour...
and not sure if you add some new production, whether i will work or not.

bals



----- Original Message -----
From: "Silvain Piree" <s.piree at enneya.com>
To: <antlr-interest at yahoogroups.com>
Sent: Friday, June 21, 2002 12:21 PM
Subject: [antlr-interest] Can someone please explain


>
> Hi,
>
> I'm getting nondeterminism warnings on my grammar but
> I don't understand why.
>
> Following rule does not cause a problem when using k=5:
>
> rule:    A B C D E       |     A B C D F   ;
>
> But, when I make the B optional then I get a nondeterminism
> warning regardless of lookahead 'k':
>
> rule:    A (B)? C D E       |     A (B)? C D F   ;
>
> Any suggestions would be much appreciated,
>
> Silvain
>
>
>
>
>
>
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