[antlr-interest] Avoiding ClassCastExceptions in org.antlr.runtime.tree.BaseTree (Limitation in ANTLR v 3.1)

[Terence Parr]

Cool. done. fixed in my development branch. I changed one of the  
method also.
Ter
On Oct 2, 2008, at 6:26 AM, Tim Halloran wrote:

> 3.1.1 didn't fix the below problem.  I can't get into Jira; but I  
> think the below is really a bug.
>
> On Wed, Sep 24, 2008 at 2:03 PM, Tim Halloran <hallorant at gmail.com>  
> wrote:
> I'm using the standard Tree implementations (extending BaseTree) in  
> combination with a custom implementation of Tree.  The problem is  
> that BaseTree assumes that it is only being used with subclasses of  
> BaseTree despite it's implementation really not needing to make this  
> assumption.  I propose fixing the code to eliminate this problem.
>
> I modified the getChild() and toStringTree() methods in  
> BaseTree.java.  I changed lines 56 and 297 to cast to Tree, instead  
> of BaseTree.  For example:
>
>     public Tree getChild(int i) {
>         if ( children==null || i>=children.size() ) {
>             return null;
>         }
>         return (Tree) children.get(i);  // line 56
>     }
>
> There might be some other places to change, but I have only  
> encountered problems with these.
>
>
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