[antlr-interest] Tree parser and Java interface question to passing rule results

[Terence Parr]

Hi.
On Jan 2, 2008, at 12:39 PM, Thomas Bernhardt wrote:

> Can someone please help me get a tree walker to invoke a Java method  
> for a rule, passing the tree node representing the rule result?
>
> I have the tree grammar as follows, and the "???" is what I'm trying  
> to figure out:
>
> valueExpr
>     :     constant { leaveNode(???); }
>     |      // ...
>     ;
>
> constant
>     :    INT_TYPE
>     |    LONG_TYPE
>     |    FLOAT_TYPE
>     |    DOUBLE_TYPE
>     |    STRING_TYPE
>     |    BOOL_TYPE
>     |    NULL_TYPE
>     ;
>
> The goal is to get the tree or node that resulted from the  
> "constant" rule to be passed to the "leaveNode(Tree tree)" method.  
> What should "???" be?

$constant.tree

Ter
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