From: Aaron Patterson <aaron_patterson@...>
Date: 2007-01-27T10:14:56+09:00
Subject: Re: Working with the parse tree in Ruby?

On Sat, Jan 27, 2007 at 09:20:55AM +0900, Martin C. Martin wrote:
> Hi,
> 
> In Lisp, it's easy to get the parse tree of an expression, and to 
> manipulate those parse trees.  That means Lisp code tends to use macros, 
> i.e. lisp functions whose return values are parse trees.  These macros 
> are evaluated at compile time and inserted into the place where the 
> macro call appears.
> 
> Is there anything equivalent in Ruby?  Is there a way in Ruby to get the 
> parse tree of, say, x + y?  Is there a way to execute parse trees?

Yes, you can get the parse tree using "ParseTree"
  
  http://rubyforge.org/projects/parsetree/

Then convert the parse tree back to ruby with ruby2ruby:

  http://rubyforge.org/projects/seattlerb/

HTH!

-- 
Aaron Patterson
http://tenderlovemaking.com/