On Sun, 2009-05-17 at 12:48 +0200, Micha wrote:
> On Sunday 17 May 2009 11:01:36 Jesper Larsson wrote:
> > 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:
Hm, as far as I can tell your variant has exactly the same problems as
mine. The following grammar, incorporating the trick from yours, can
match "foobar" as FOO BAR but fails on "foofoobar":
============================================
grammar Y;
options { output=AST; }
file: (FOO|BAR|FOOZ)* EOF;
fragment FOO: ;
fragment FOOZ: ;
BAR: 'bar';
WS: (' ' | '\n')+ { skip(); };
FOO_OR_FOOZ: (
'foo' { $type = FOO; }
('foo'* 'z' { $type = FOOZ; })?
)
| 'z' { $type = FOOZ;};
============================================
J'
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