[gate-users] extending JAPE with semantic predicates

[Taras S. <st...@gm...>]

Hi all,

  I need a feature along the lines of ANTLR validating semantic 
predicates ( 
http://stackoverflow.com/questions/3056441/what-is-a-semantic-predicate-in-antlr 
). That is, before firing the RHS of a rule I'd like to check if the 
current bindings satisfy some predicate. I don't want to do this in the 
Java RHS because I'd like the transducer to backtrack and try other 
rules when the predicate does not hold.  Hypothetical syntax:

Rule: PersonName
(  ({FirstName}):firstname ({LastName}):lastname ):match
When: firstname.country == lastname.country
--> :match.Name = {}

  As far as I understand the only ways to extend Jape now are custom 
AnnotationAccessor's and ConstraintPredicate's, which are not enough for 
the task at hand. I'm willing to develop a custom transducer but before 
diving into that I'd like to ask for suggestions - what would be the 
optimal strategy to develop such a transducer, classes to look at, etc


best regards,
Taras