[antlr-interest] Re: yet another java 1.5 grammar

[Monty Zukowski]

Syn preds in loops work in some cases and not in others.  You can't 
have a syntactic predicate cause you to break out of a loop, you can 
only have it keep you in the loop.

Monty

ANTLR & Java Consultant -- http://www.codetransform.com
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On Aug 25, 2004, at 2:21 PM, thrutchy wrote:

> --- In antlr-interest at yahoogroups.com, "lgcraymer" <lgc at m...> wrote:
>> --- In antlr-interest at yahoogroups.com, Terence Parr <parrt at c...> 
>> wrote:
>>>
>>> On Aug 25, 2004, at 11:02 AM, Michael Stahl wrote:
>> ...
>>>> do you have any comment on the syntactic predicate in loops
>>>> issue i have with antlr? (see original posting)
>>>
>>> I'm completely underwater at the moment breathing through a small
> straw
>>> ;)  I'm gearing up for school; advising students and prepping my
> first
>>> classes.  Ugh.  I expect to surface next week sometime. :)
>>
>> Ter may be completely under water at the moment, but the "synpreds in
>> loops" issue has been raised as an ANTLR 3 design concern and one that
>> will probably be addressed.  Right now, you can use synpreds in
>> recursive definitions, but not in loops.  That rules out an important
>> class of refactorings:  it is important that logically equivalent
>> constructs actually have the same behavior!
>>
>> --Loring
>
>
> As far as I can tell, syntactic predicates with loops do work - you
> just have to ignore the warning.  I use a wrapper to antlr that
> filters out these (one of my previous posts has it).
>
> Eric
>
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