[antlr-interest] accessing parent node in order to replace

[Micheal J]

Hi,
 
You could pass some information/attributes up from production_b that
production_a then takes into account when deciding what sort of tree to
build.
 
Micheal

-----------------------
The best way to contact me is via the list/forum. My time is very limited. 

-----Original Message-----
From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-bounces at antlr.org] On Behalf Of Pam L Sampson
Sent: 31 May 2007 21:16
To: antlr-interest at antlr.org
Subject: [antlr-interest] accessing parent node in order to replace


I would like to build a tree where in some cases I want the parent node
removed and replaced with a different tree. My question is how do I access
the parent node of the tree I am currently building. For example:

production_a
    : token production_b
    //tree built here
    ;
production_b
    : token 
    //now here I would like to replace the tree built in production_a
    //with a new tree for production_b but only in some cases
    //how do I replace the previous subtree with the new one?
    ;


=

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