Ruby_parser 3.5.0 Released

ruby_parser version 3.5.0 has been released!

ruby_parser (RP) is a ruby parser written in pure ruby (utilizing
racc–which does by default use a C extension). RP’s output is
the same as ParseTree’s output: s-expressions using ruby’s arrays and
base types.

As an example:

def conditional1 arg1
  return 1 if arg1 == 0
  return 0
end

becomes:

s(:defn, :conditional1, s(:args, :arg1),
  s(:if,
    s(:call, s(:lvar, :arg1), :==, s(:lit, 0)),
    s(:return, s(:lit, 1)),
    nil),
  s(:return, s(:lit, 0)))

Tested against 801,039 files from the latest of all rubygems (as of
2013-05):

  • 1.8 parser is at 99.9739% accuracy, 3.651 sigma
  • 1.9 parser is at 99.9940% accuracy, 4.013 sigma
  • 2.0 parser is at 99.9939% accuracy, 4.008 sigma

Changes:

3.5.0 / 2014-03-24

  • 1 major enhancement:

    • Added initial support for ruby 2.1 syntax. Doesn’t have numeric
      extensions yet.
  • 2 minor enhancements:

    • Converted ruby_lexer.rex to use new grouping mechanism. ~15%
      improvement in speed.
    • Various lexer cleanup.
  • 2 bug fixes:

    • 2.0/2.1: Fixed block kw args.
    • Fixed env for kwargs and friends.

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