[antlr-interest] Problem with *
Martin Probst
mail at martin-probst.com
Wed Feb 8 14:40:40 PST 2006
Hi,
maybe you could post your whole grammar? That might help. You can also
get debug trace from the lexer if you run antlr with the option
-debugLexer (if I remember correctly). Sometimes reading the generated
code or tracing through it can help a lot (you have to look at the
lexer).
A possible cause would be that the '*' character is matched by a
different rule in your Lexer (which would explain why writing it
literally in the parser works). Make sure no other Lexer rule can match
a single star. Do you get any non-determinism warnings from ANTLR?
Martin
Am Mittwoch, den 08.02.2006, 22:43 +0100 schrieb Jens Bartelheimer:
> Hi again,
>
> has nobody a solution for my problem?
>
> I have recognized that the same problem exist if I define only one
> single token in my rule.
>
> Jens
>
> Jens Bartelheimer wrote:
> > Hi,
> >
> > I am new to antlr and I have a problem with the Star *.
> >
> > If I only parse a String with a star the first rule recognize the
> > star, the second with a token not.
> >
> > Why?
> >
> > 1st:
> > ----
> >
> > getTest
> > {
> > }
> > : "*"
> > {
> > System.out.println("Star gefunden");
> > }
> > ;
> >
> >
> > 2nd:
> > getTest
> > {
> > }
> > : STAR
> > {
> > System.out.println("Star found");
> > }
> > ;
> >
> > Lexer:
> > STAR: '*';
> >
> > raises: line 1:1: expecting STAR, found '*'
> >
> >
> >
>
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