[antlr-interest] [v3] Rule references in rewrite rules?

[David Holroyd]

On Mon, Aug 21, 2006 at 12:55:24PM +0000, David Holroyd wrote:
> Should the following do what I think it should..?
> 
>   compilationUnit:
>           'package' packageBlock -> ^(COMPILATION_UNIT $compilationUnit)
>       ;
> 
> I was expecting this to give me a result tree which looks like,
> 
>   #( COMPILATION_UNIT 'package' ..etc.. )
> 
> but instead I just get,
> 
>   #( COMPILATION_UNIT )
> 
> 
> Is my syntax wrong, or is $compilationUnit not actually a reference to
> the entire pre-rewrite tree for the compilationUnit rule?  (I can't
> remember where I read that it should be, any more.)

To answer my own question for the record:

I think that the issue is that $rulename is assigned the result of the
last rewrite which executed in the current rule, and before that it is
empty.

So, $rulename can't be used as a shorthand for the default tree for the
l.h.s., as I had for some reason hoped.

ta,
dave

-- 
http://david.holroyd.me.uk/