From: Thomas Chust <chust@...>
Date: 2009-08-04T22:50:50+09:00
Subject: Re: Kind of ParsTree for 1.9.1

2009/8/4 Macario Ortega <macarui@gmail.com>:
> [...]
> Hi, I've been missing ParseTree very badly in 1.9.1. So in my naivité I
> decided to try to convert YARV iseq's to Sexp's similar of those
> produced by ParseTree.
> [...]
> Is someone aware of a similar effort?
> [...]

Hello,

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
  }

  $ 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.

cu,
Thomas


-- 
When C++ is your hammer, every problem looks like your thumb.