[antlr-interest] treewalker $expression.text?

[Terence Parr]

On Sep 6, 2007, at 12:22 PM, Martin Kohl wrote:

> I don't understand what you mean with a single subtree and multiple  
> subtrees. As it stands now, my Tree Walker Grammar matches the  
> Parser Grammar for most of the rules.
> A few Parser Rules have been rewritten though. Here is an example  
> containing a rewritten rule and one that is left alone:
>
> Parser Rule:
>
> tokens {
> PLUS;
> }
> expr
> : aRule PlusTok bRule -> ^(PLUS aRule bRule)
> | aRule MinusTok bRule
> ;
>
> Tree Walker:
> expr
> : ^(PLUS aRule bRule)
> | aRule MinusTok bRule
> ;

this is explained in the book somewhere, but basically start/stop  
nodes for tree matching rules don't make a whole lot of sense.  if  
those rules match single roots, then do $aRule.text etc...

Ter