[antlr-interest] Re: Syntatic predicates...

[lgcraymer]

--- In antlr-interest at yahoogroups.com, Tom Verbeure <hombre at g...> wrote:
> Hello All,
> 
> What would prevent me to generously spread around syntatic predicates
> to resolve non-determinisms in my grammar? I've noticed that adding
> them can magically solve a lot problems.

Nothing--I've found that synpreds help in bringing a grammar up.  Once
you have it working, you can go back and carefully refactor to
eliminate many of them.

> 
> E.g.
> rule1 : ruleA
>      | ruleB;
> 
> can give me loads of trouble, while
> 
> rule1: (ruleA) => ruleA
>      | ruleB;
> 
> doesn't. I understand that there may be performance issues or that it

Bingo!  Also maintainability to some extent.

--Loring

> may be considered impure to do this if there are other ways to solve
> it. In addition, it may encourage me not to investigate the core
> reason for nondeterministic rules. (Can a syntatic predicate hide real
> problems?)
> 
> But are there other fundamental disadvantages with this that I should
> be aware of?
> 
> Thanks,
> Tom



 
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