On Sunday 17 May 2009 11:01:36 Jesper Larsson wrote:
> > If you want the longest match, then left factor everything and let it
> > do that:
> >
> > A ( B (C|) |) ;
> >
> > And set the token type at the appropriate points.
>
> Not always so easy, however. My original example was, even more
> simplified, something like this:
>
> FOO: 'foo';
> BAR: 'bar';
> FOOZ: 'foo'* 'z';
>
that works with the method mentioned earlier:
start : ( FOO { System.out.println("foo, ");}
| FOOZ { System.out.println("FOOZ, ");} )* EOF;
WS : (' ' | '\t' | '\n')+ { skip(); };
fragment FOO : ;
fragment FOOZ: ;
FOO_OR_FOOZ
: (
'foo' { $type = FOO; }
('foo'* 'z' { $type = FOOZ;} )?
)
| 'z' { $type = FOOZ;};
Michael
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