Ruby parser written in pure Ruby

 parser is a production-ready Ruby parser written in pure Ruby. It
 recognizes as much or more code than Ripper, Melbourne, JRubyParser
 or ruby_parser, and is vastly more convenient to use.
 .
 Among its keys features are: it provides precise source location reporting, it
 has a documented AST format which is convenient to work with, it parses 1.8,
 1.9, 2.x, and 3.x syntax with backwards-compatible AST formats, and also parses
 MacRuby and RubyMotion syntax extensions. It also has improved clang-like
 diagnostic messages with location information.
 .
 It is written in pure Ruby, runs on MRI >= 2.0.0, JRuby and Rubinius, and
 historically, all versions of Ruby since 1.8. It has excellent test coverage
 and the source code is readable and well commented.
 .
 Not to be confused with ruby_parser gem from Ryan Davis, of seattle.rb
 Ruby user group.