[antlr-interest] heterogeneous trees

[Terence Parr]

Hi,

I'm interested in hearing people's needs vis-a-vis heterogeneous ASTs  
where each node can have a different type rather than all trees  
having CommonTree type.

The adaptor.create(tokenType) method can easily switch on tokenType  
to create special nodes, but in some cases you might want ID to be  
Var and others to be Method.  Any other "user stories"?  The v2 stuff  
let you set overall type for tokenType but I'll leave that to adaptor  
this time I think.  It also let you set the type per token ref, which  
we could allow like this:

method : 'void' ID<Method> '(' args ')' body ;

decl : 'int' ID<Var> ';' ;

etc...

Would that be sufficient?  if so, I can get it into 3.1 whenever that  
comes out.  I have tree building in tree grammars now and a cool  
rewrite mode for it.

Ter