[antlr-interest] Why can't I use $stop in an @after action?

[Terence Parr]

weird.  wait. does $stop work for tree grammars? you might try input.LT(-1) or -2.
T
On Feb 5, 2010, at 11:36 AM, Chris DiGiano wrote:

> I've read and reread the documentation on the $stop attributes of
> rules, but I can't for the life of me figure out how to use it to get
> the last matched node. Here's what I want to do:
> 
> impliedQualifiedName returns [Tree idNode]
> @after {
>  $idNode = $stop;  // I also tried $impliedQualifiedName.stop
> }
>  : Identifier
>  | ^( BYFIELD qn=impliedQualifiedName Identifier )
>  ;
> 
> But I get the error "attribute is not a token, parameter, or return
> value: stop".
> 
> Instead I have to do:
> 
> impliedQualifiedName returns [Tree idNode]
>  : Identifier { $idNode = $Identifier; }
>  | ^( BYFIELD qn=impliedQualifiedName Identifier )
>    { $idNode = $Identifier; }
>  ;
> 
> What am I doing wrong?
> 
> Chris
> 
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