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

[Thomas Bernhardt]

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?

Thank you!
Tom 
http://esper.codehaus.org   Esper loves ANTLR




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<!-- DIV {margin:0px;}-->Can
you please help me get my 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 that resulted from the "constant" rule to be
passed to the "leaveNode(Tree tree)" method. What should "???" be?

Thank you!
Tom 
http://esper.codehaus.org   Esper loves ANTLR





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