[antlr-interest] strange bug (v 2.7.2)

[Lloyd Dupont]

big thanks for this easy solution !

----- Original Message ----- 
From: "Terence Parr" <parrt at cs.usfca.edu>
To: <antlr-interest at yahoogroups.com>
Sent: Thursday, July 03, 2003 3:20 AM
Subject: Re: [antlr-interest] strange bug (v 2.7.2)


> This is an approximate lookahead issue.  Break it up like this:
>
> NE : "<>" ;
>
> NE2: "!=" {$setType(NE);}
>
> ....
>
> Ter
>
> On Tuesday, July 1, 2003, at 11:01  PM, Lloyd Dupont wrote:
>
> > :> java antlr.Tool FileMaker2.g
> > ANTLR Parser Generator   Version 2.7.2   1989-2003 jGuru.com
> > FileMaker2.g: warning:lexical nondeterminism between rules NOT_EQ and
> > LE
> > upon
> > FileMaker2.g:     k==1:'<'
> > FileMaker2.g:     k==2:'='
> > FileMaker2.g:     k==3:<end-of-token>
> >
> > :>
> > ----- Original Message -----
> > From: "Terence Parr" <parrt at cs.usfca.edu>
> > To: <antlr-interest at yahoogroups.com>
> > Sent: Wednesday, July 02, 2003 3:56 PM
> > Subject: Re: [antlr-interest] strange bug (v 2.7.2)
> >
> >
> > What's the warning say?
> >
> > Ter
> >
> > On Tuesday, July 1, 2003, at 10:33  PM, Lloyd Dupont wrote:
> >
> >> (I join you a simple failing grammar)
> >>
> >> basically I have a simple tokens definition like that:
> >> //--------------------------- lexer.g ----------------
> >> class FMSqlLexer extends Lexer;
> >> options {
> >> k = 3;
> >> charVocabulary = '3' .. '177';
> >> }
> >>
> >> NOT_EQ: ("<>") | ("!=") | ("^=") ;
> >> LE: ("<=") ;
> >> LessT: "<" ;
> >> // ---------- end of lexer ----------
> >>
> >> and ANTLR find it ambiguous !
> >>
> >> what's wrong ?
> >> I mean which clues should I give to ANTLR to help it understand its
> >> errors ?
> >>
> >>
> >>
> >> Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
> > --
> > Professor Comp. Sci., University of San Francisco
> > Creator, ANTLR Parser Generator, http://www.antlr.org
> > Co-founder, http://www.jguru.com
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> >
> >
> >
> >
> >
> >
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> >
> >
> >
> >
> >
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> >
> > <FileMaker2.g>
> --
> Professor Comp. Sci., University of San Francisco
> Creator, ANTLR Parser Generator, http://www.antlr.org
> Co-founder, http://www.jguru.com
> Co-founder, http://www.knowspam.net enjoy email again!
> Co-founder, http://www.peerscope.com link sharing, pure-n-simple
>
>
>
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>


 

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