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by ryan davis



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ruby_parser version 3.19.0 has been released!

Published 2022-03-29 @ 20:00

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:

3.19.0 / 2022-03-29

  • 1 major enhancement:

    • Added tentative 3.1 support.
  • 7 minor enhancements:

    • 3.1: bare RHS assoc: { y: } => s(:hash, s(:lit, :y), nil)
    • 3.1: calls w/ unnamed block args (bare &)
    • 3.1: endless defn/defs w/ paren-less calls (aka commands)
    • 3.1: pattern capture to nonlocal vars, eg: ^@a, ^$b, ^@@c
    • 3.1: pattern: ^(expr) => expr
    • Improved steps for adding new versions.
    • Improved steps for running gauntlets.
  • 2 bug fixes:

    • Bumped 2.6+ cached versions for rake compare.
    • Skip test_regexp_esc_C_slash on ruby 3.1.0 because of MRI bug.
  • home: https://github.com/seattlerb/ruby_parser
  • bugs: https://github.com/seattlerb/ruby_parser/issues
  • rdoc: http://docs.seattlerb.org/ruby_parser