Ruby_parser 3.4.1 Released

ruby_parser version 3.4.1 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:

3.4.1 / 2014-02-14

  • 1 minor enhancement:

    • Added StackState#store and #restore.
  • 1 bug fix:

    • 1.8/1.9/2.0: Fixed tSTRING_DBEG w/ f’d up amounts of nesting +
      braces + do/end. yeah. I’m as confused as you are.

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