[antlr-interest] Noob TreeWalker Template question

[PSheehan at decaresystems.ie]

Hi all,
I'm completely new to Antlr with no previous complier/parser experience. 
I'm create a simple lexer/parser and treewalker to help me understand the 
ins and outs of Antlr.  I also have the Antlr reference book, which I 
would be completely lost without!

I'm having a simple problem when trying to process a rule that does not 
have a template associated with it.  When I run my example I get an 
ArrayList of nulls for 'fields'.

options{
       tokenVocab=mytest;
        ASTLabelType=CommonTree;
        output=template;
}

model   :       ^(MODEL TYPE fs+=fielddef+) -> 
modeltmp(name={$TYPE},fields={$fs})
        ;

fielddef returns [String type,String id] 
        :       ^(FIELD TYPE ID) {$type=$TYPE.text;$id=$ID.text;}
        ;


When I look at the generate code it is like this

                    fs=fielddef();
                    _fsp--;

                    if (list_fs==null) list_fs=new ArrayList();
                    list_fs.add(fs.getTemplate());

Sorry if this is a simple question but is there a way I can modify the 
grammar so that I end up with an ArrayList of return_fielddef like so:-

                    fs=fielddef();
                    _fsp--;

                    if (list_fs==null) list_fs=new ArrayList();
                    list_fs.add(fs);

Or do have I have to use scopes in my grammar to deal with this problem. 
Thanks,
Paul


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