[antlr-interest] Changing the base node type

[Bruno Marc-Aurele]

Thanks a lot Sam & Ter. Your answers helped a lot!

Bruno M-A
--
Bruno Marc-Aurèle
courriel Poly: bruno.marc-aurele at polymtl.ca
courriel perso: bruno.m-a at hotmail.com


Selon Sam Harwell <sharwell at pixelminegames.com>:

> You'll also see to call setTreeAdaptor (java target) in the @init section of
> the entry rule(s) to your grammar. Your implementation of TreeAdaptor should
> include implementations of at least the following 2 functions (example here
> is the C# target just because I had it ):
>
> class GrammarASTAdaptor : CommonTreeAdaptor
> {
>     public override object create( IToken payload )
>     {
>         GrammarAST t = new GrammarAST( payload );
>         return t;
>     }
>     public override object errorNode( ITokenStream input, IToken start,
> IToken stop, RecognitionException e )
>     {
>         GrammarAST t = new GrammarASTErrorNode( input, start, stop, e );
>         return t;
>     }
> }
>
> Sam
>
> -----Original Message-----
> From: antlr-interest-bounces at antlr.org
> [mailto:antlr-interest-bounces at antlr.org] On Behalf Of Terence Parr
> Sent: Friday, February 06, 2009 9:56 AM
> To: Bruno Marc-Aurele
> Cc: antlr-interest at antlr.org
> Subject: Re: [antlr-interest] Changing the base node type
>
> Hi. There should be a faq entry on this or an example.  Implement
> TreeAdaptor :)
> Ter
> On Feb 6, 2009, at 6:17 AM, Bruno Marc-Aurele wrote:
>
> > Hello all,
> >
> > I am trying to do a grammar with a new base type for nodes. I can
> > see that I am
> > provided with ASTLabelType, whose value I set to Node, the name of my
> > CommonTree subclass. The only difference between the two classes is
> > the
> > presence of a "Accept" method. The parser, however, still creates
> > CommonTree
> > nodes (of course, the ITreeAdaptor is still a CommonTreeAdaptor).
> >
> > What would be the suggested method to make my parser create Node
> > objects instead
> > of CommonTree objects?
> >
> > Thanks a lot,
> > Bruno M-A.
> >
> > P.S.: I am using the C#2 target.
> > --
> > Bruno Marc-Aurèle
> > courriel Poly: bruno.marc-aurele at polymtl.ca
> > courriel perso: bruno.m-a at hotmail.com
> >
> >
> >
> >
> >
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