[antlr-interest] Problem with keeping data associated with AST nodes in antlr transform mode

[Adrian Tineo]

I think you need to have your own factory subclassed from ASTFactory 
overriding the create() and make() methods. Then in your main class you would 
do:

parser.setASTNodeClass(package.Class);

Check http://www.antlr.org/doc/trees.html#_bb11

Adrian Tineo


El Martes, 15 de Junio de 2004 14:30, Jogchem de Groot escribió:
> Good afternoon,
>
> I'm working on a translater using ANTLR which uses several
> transformation phases (implemented
> as tree walkers). Frequently i'd like to associate data with AST nodes
> in the transformation phases
> which can be used in later phases.
>
> The problem is that data i associate with some AST does keep associated
> with the equivalent AST nodes
> in the resulting transformed AST. I looked a little into the problem at
> it seems to me that ANTLR
> generates AST generation code which constructs the new AST just after
> the nodes have been matched.
> So even though you can create your own initialize() methode in your own
> AST node class, which can copy
> all extended data fields from an existing AST node in a new AST node,
> this wont have any effect as
> updates done the old AST node will not be reflected in the new AST node.
>
> For example:
>
> #(b:blah) { b.setData(data); }
>
> This will associate 'data' with the old AST node (b), but not with the
> newly generated equivalent AST node for
> the transformed tree, because that AST node has been constructed before
> the 'b.setData(..)' code has executed.
>
> Is there anyway to get around this problem?
>
> Thanks in advance!
>
> Regards,
>     Jogchem
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>



 
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