From: Giles Bowkett <gilesb@...>
Date: 2006-05-26T02:04:57+09:00
Subject: Re: Zed and Luis drop the bomb on Ruby's poor performance

I don't have ParseTree installed on my (dooky) work machine, I think
I'll try this at home tho.

But I have a question, apologies if it's obvious -- is that a
superficial result or a meaningful result? It looks as if the magic
missing link here is ParseTree. Can you just drop that output into a
Lisp interpreter, badda bing badda boom?

On 5/23/06, Logan Capaldo <logancapaldo@gmail.com> wrote:
>
> On May 23, 2006, at 10:24 PM, Douglas Livingstone wrote:
>
> > 2006/5/24, Logan Capaldo <logancapaldo@gmail.com>:
> >>
> >> How about we rewrite the ruby runtime as a combination of macros and
> >> functions in Lisp, use ParseTree to get the S-Exp representation of a
> >> ruby program and then feed that into our Lisp compiler? Instant
> >> speedy ruby! ;)
> >>
> >
> > With an install of ParseTree:
> >
> > $ cat example.rb
> > #!/usr/local/bin/ruby
> > def sum(a, b)
> >  return a+b
> > end
> >
> > a = 3
> > b = 4
> > c = pythag(a, b)
> > puts c
> >
> > $ cat lispify.rb
> > #!/usr/local/bin/ruby
> >
> > def lispify(code)
> >  code.gsub!(/[:,]/, '')
> >  code.gsub!(/\[/, '(')
> >  code.gsub!(/\]/, ')')
> > end
> >
> > code = $stdin.read
> >
> > puts lispify(code)
> >
> > $ cat example.rb | parse_tree_show -f | ./lispify.rb
> > ((defn
> >  sum
> >  (scope
> >   (block
> >    (args a b)
> >    (return (call (lvar a) + (array (lvar b)))))))
> > (lasgn a (lit 3))
> > (lasgn b (lit 4))
> > (lasgn c (fcall pythag (array (lvar a) (lvar b))))
> > (fcall puts (array (lvar c))))
> >
> > So, it looks like Lisp to me! Now, some macros?
> >
> > Douglas
> >
>
> What scares (excites?) me is that this looks almost close enough to
> work already.
>
>
>
>


-- 
Giles Bowkett
http://www.gilesgoatboy.org