[antlr-interest] ANTLR 3 using k=0, any info on doing this?

[The Researcher]

Ter

Thanks, they work great, but then I run into what I believe is the "Trouble
with syntactic predicates that reference semantic predicates that rely on a
current dynamic attribute scope" which is why I have asked Sam about
@scopeinit. I can get around it, but it doesn't seem intuitive.

If you are anyone else wants me to keep an eye open for certain things while
writing this grammar, just ask.

I do have several suggestions in the work, but want to have a working
grammar for at least the PE Image before any write-up, then move onto the
.text section which is where it will get really interesting.

Eric

On Wed, Mar 2, 2011 at 1:16 PM, Terence Parr <parrt at cs.usfca.edu> wrote:

> Use {...}?=> for this.It forces the predicates to be tested regardless of
> whether or not the lookahead predicts an alternative.
>
> Ter
>  On Feb 28, 2011, at 6:12 PM, The Researcher wrote:
>
> > I tried searching the interest group with k=0 but that wasn't productive,
> > and Google doesn't do any better.
> >
> > Yes I know setting k=0 is not what one normally if ever does with ANTLR,
> but
> > I am researching what it will take to get ANTLR to validate a Microsoft
> > Common Language Infrastructure file. I did write a separate validator by
> > hand and that works great.
> >
> > One of my goals out of this is to have a way to write binary file readers
> > and validators using ANTLR. Yes I know that I will have to modify ANTLR.g
> to
> > do this correctly, but before that, I have to know what the current
> ANTLR.g
> > is capable of doing and what needs to be modified or enhanced.
> >
> > So far I have only fond the ANTLR 2 Java .class file reader by Andreas
> > Rueckert and the few mentions of using Bytes in "Definitive ANTLR
> > Reference". I am getting the other book.
> >
> > Using gated semantic predicates is working out great, but ANTLR is
> > determined to check for multiple alternatives. I was hoping that K=0
> would
> > shut that whole process down  and using the gated semantic predicates to
> > dynamically shut off the options would leave ANTLR not trying
> alternatives.
> >
> > Any clues or references are welcome.
> >
> > Thanks Eric
> >
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