[antlr-interest] Re: Indeterminacies

[Lubos Vnuk]

Hi Chris,

I've just had a quick look and your nondeterminism may be avoided by 
changing the params rule:

params
:
	( SEMI ( WS )* param )+
	;


Note the change from * to +
Your original params rule could have matched nothing, which is 
usually to be avoided.

HTH,
Lubos.


--- In antlr-interest at yahoogroups.com, "offline314159" <offline at s...> 
wrote:
> I've gotten a lot more done on that grammar i was asking about, but
> i'm still stuck on two points, and i was hoping that someone would 
be
> willing to take the time to examine what i do have done and perhaps
> offer some critiques on it overall, and also help me with the two
> sticking points i have.
> 
> The grammar is a bit large, so for politeness' sake i put it on my
> site at http://offline.pointclark.net/vcard.g , Feel free to snag it
> and look at it.
> 
> Anyway, first thing is the two problems i'm having specifically:
> 
> First, there are indeterminacies in the grammar on lines 39-51 (5 of
> them) that i don't get - i can't seem to get rid of them.
> 
> Second, there's a part of the vcard spec that essentially allows the
> value for an item to be pretty much any format, so how do i look for
> that?  When i reach the point in the line where there can be a 
value,
> it could be plain text, quoted-printable, base64 encoded, or some
> other as-yet unknown arbitrary encoding.  The only thing i do know 
at
> this point is that i can pretty much be assured that everything
> following a colon in the line will be a value of some kind, and
> there's nothing else that comes after it.
> 
> With respect to other critiques, as far as i'm concerned, if you're
> kind enough to take the time to examine this novice's work, i will 
be
> more than happy to learn from you.
> 
> Thanks in advance.
> 
> --
> Chris



 
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