AFAIK, rrb project which adds some refactoring capabilities to emacs 
uses similar to ParseTree library called ripper. BTW, ripper is now 
part of Ruby 1.9.

Link: http://www.kmc.gr.jp/proj/rrb/index-en.html

Cheers,
Kent.

On Feb 2, 2005, at 8:45 AM, martinus wrote:

> This is very cool. Would it be possible to use PraseTree for a
> refactoring toolkit?
>
> martinus
>
>