From: Caleb Clausen <vikkous@...>
Date: 2009-08-05T02:04:51+09:00
Subject: Re: Kind of ParsTree for 1.9.1

On 8/4/09, Thomas Chust <chust@web.de> wrote:
> the Ruby 1.9.1p243 that I installed from source came with a library
> called 'ripper' that can produce S-expression parse trees from Ruby
> code, like this:
>
>   $ cat foo.rb
>   require 'ripper'
>   require 'pp'
>
>   pp Ripper.sexp %{
>     def foo
>       :bar
>     end
>   }

Hey, I've been wondering how one gets a tree out of ripper, or even if
it can be done at all. Thanks!

>   $ ruby foo.rb
>   [:program,
>    [[:def,
>      [:@ident, "foo", [2, 6]],
>      [:params, nil, nil, nil, nil, nil],
>      [:body_stmt,
>       [[:symbol_literal, [:symbol, [:@ident, "bar", [3, 5]]]]],
>       nil,
>       nil,
>       nil]]]]
>
> I played around with that a little, but didn't try to code anything
> serious. Also, since I'm new to Ruby and haven't used ParseTree
> before, I don't know how compatible the abstract syntax tree
> representations are.

That's definitely not compatible with any of the ParseTree formats.