Parsing perl without Perl (sort of)

Adam Kennedy's new module PPI:

   http://www.perl.com/pub/a/2005/06/09/ppi.html
   http://search.cpan.org/perldoc?PPI

His module attempts to implement a parser that:
> ... creates a "round-trip" capability, parsing a file into an internal 
> model and back out again without moving a single white space character 
> out of place. Even if parts of a file are broken or badly formatted, 
> you can still change other parts of the file and save it correctly 
> without it changing anything you don't alter.
>
> Second, it makes the parser extremely safe and error-tolerant. Any 
> code open in an editor is there for a reason--generally because it 
> isn't finished yet, is broken, or needs changing. A document parser 
> can hit a problem, flag it, stumble for a character or so until it 
> finds something it recognizes, and then continue on.

I wonder if there are concepts in his implementation that have a 
bearing on Perl 6 design?

-------------------------------------------------------
Matisse Enzer <matisse@matisse.net>
http://www.matisse.net/  - http://www.eigenstate.net/
415-225-6703 (work/cellphone)
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• Parsing perl without Perl (sort of) by J Matisse Enzer