[antlr-interest] Re: probably too obvious to see it - plz hel p
Matt Benson
gudnabrsam at yahoo.com
Tue Aug 5 07:04:35 PDT 2003
Yay!
Sorry, couldn't resist...
--- mzukowski at yci.com wrote:
> That looks good to me.
>
> Monty
>
> -----Original Message-----
> From: Matt Benson [mailto:gudnabrsam at yahoo.com]
> Sent: Friday, August 01, 2003 10:21 AM
> To: antlr-interest at yahoogroups.com
> Subject: Re: [antlr-interest] Re: probably too
> obvious to see it - plz help
>
>
> This is probably not the best way, but it works. I
> added a semantic predicate to the IDENTIFIER rule:
>
> IDENTIFIER
> : {LA(2) != '\''}? ('a'..'z')+
> ;
>
> -Matt
>
> --- tdjastrzebski <tdjastrzebski at yahoo.com> wrote:
> > It should choose StringLiteral when 'n' is
> followed
> > by '\''.
> > So how do I fix it ?
> > Tom Jastrzebski
> >
> > --- In antlr-interest at yahoogroups.com,
> > mzukowski at y... wrote:
> > > So if it sees "n" which rule is it supposed to
> > choose? You need to
> > handle
> > > the two possibilities prefixed with 'n' in one
> > rule.
> > >
> > > Monty
> > >
> > > -----Original Message-----
> > > From: tdjastrzebski [mailto:tdjastrzebski at y...]
> > > Sent: Thursday, July 31, 2003 4:14 PM
> > > To: antlr-interest at yahoogroups.com
> > > Subject: [antlr-interest] probably too obvious
> to
> > see it - plz help
> > >
> > >
> > > I ma probably too tireed to see it. Why
> following
> > two lexer rules
> > > cause nondeterminism (k=2).
> > >
> > > Identifier
> > > : ('a'..'z')+
> > > ;
> > > StringLiteral
> > > : ('n')? '\'' (~'\'')* '\''
> > > ;
> > >
> > > StringLiteral rule is supposed to match unicode
> > strings like:
> > > n'blabla'
> > >
> > > Thanks in advance.
> > > Tom Jastrzebski
> > >
> > > full test grammar:
> > >
> > > options {
> > > language = "Java";
> > > }
> > >
> > > class TestParser extends Parser;
> > > options {
> > > k = 2;
> > > }
> > >
> > > expression
> > > : (Identifier | StringLiteral) EOF
> > > ;
> > >
> > > class TestLexer extends Lexer;
> > > options {
> > > k = 2;
> > > }
> > >
> > > Identifier
> > > : ('a'..'z')+
> > > ;
> > >
> > > StringLiteral
> > > : ('n')? '\'' (~'\'')* '\''
> > > ;
> > >
> > >
> > >
> > >
> > > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
> > http://docs.yahoo.com/info/terms/
> >
> >
>
>
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