ruby_parser version 3.20.3 has been released!

Published 2023-07-11 @ 20:05

ruby_parser (RP) is a ruby parser written in pure ruby (utilizing racc–which does by default use a C extension). It outputs s-expressions which can be manipulated and converted back to ruby via the ruby2ruby gem.

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
• 2.6 parser is at 99.9972% accuracy, 4.191 sigma
• 3.0 parser has a 100% parse rate.
  • Tested against 2,672,412 unique ruby files across 167k gems.
  • As do all the others now, basically.

Changes:

3.20.3 / 2023-07-11

• 2 minor enhancements:

  • Added Parser#in_argdef and integrated into 3.x parsers.
  • Improved tools/munge.rb to handler MRI 3.2 output

• 2 bug fixes:

  • Fixed process_dots to properly deal with paren-less forward_args. (eric1234)
  • Fixed tools/ripper.rb to properly print ripper sexp at the end
• home: https://github.com/seattlerb/ruby_parser
• bugs: https://github.com/seattlerb/ruby_parser/issues
• rdoc: http://docs.seattlerb.org/ruby_parser