[antlr-interest] disambiguating sempred in a closure?

[J Chapman Flack]

Ok, here is the simplified grammar that really does
demonstrate my dilemma. The predicates can't do what
I need because of the grouping parentheses added to
factor out the common something_else suffix.

I can get the code I want if I leave off the grouping
parens and duplicate the something_else suffix on
each branch. Is that the best I can do?  I hate to
duplicate the something_else (which is followed by
a nontrivial action).

Is the story the same in ANTLR 3?

-Chap

class CelebParser extends Parser;

prod : something
        ( options { greedy=true; }
        : ( { muppet }? ( KERMIT | FOZZIE )
          | { turtle }? ( LEONARDO | DONATELLO )
          )
	 something_else
        )*
      ;

something : APPLE
           | HOWITZER
	  ;

something_else : SPACESHIP
                | APTERYX
	       ;