[antlr-interest] ANTLR 3.0ea3 released

[Terence Parr]

On Jun 23, 2005, at 12:18 PM, Gerald B. Rosenberg wrote:

> ANTLR 2.7.5/2.7.6
>
> One thing that I continue to have problems with is the need to walk  
> up trees.  Cannot seem to find a getParent() method or a working  
> example of how (best) to add this functionality to an ASTNode  
> override?  Without an existing getParent, I cannot see a clean way  
> to provide backlinks in newly created ASTNodes overrides.  Have I  
> missed something?

One way to handle this (at least I've tried it years ago) is to call  
a method to link everything up doubly *after* the tree has been  
built.  I found that the integrity/validity of double-linked trees is  
very complicated to keep together. :(

I also found that the need to "look up" is the same as needing to  
obtain context information, which usually can be provided via the  
grammar and a few variables.

> Also, are the auto-trees in 3.0 doubly linked?

Ter
--
CS Professor & Grad Director, University of San Francisco
Creator, ANTLR Parser Generator, http://www.antlr.org
Cofounder, http://www.jguru.com