Parse ruby .inspect string to be eval'd

parser.rb

def deinspect(str, level=0)
  str.gsub!(/:0x0[^ ]+/, '')

  matches = str.match(/<([\w:]+) (.*)>/)
  return str unless matches

  head = matches[1]
  body = matches[2]

  hash_content = nil
  body.gsub!(/\{.+?\}/) do |_|
    hash_content = $~[0]
    ""
  end

  level_ = level
  prev = ""
  body.gsub!(/<(?>[^><]+|\g<0>)*>/) do |_|
    level_ += 1
    prev += deinspect($~[0], level_)
    "x#{level_}"
  end
  args = []
  body.gsub("#", "").gsub(/(@?\w+)=([\w0-9]+|"[^"]*"|\{\})/i) do |_|
    args << [ $~[1], $~[2] ]
  end

  args_new = []
  after = ""
  args.each do |arg|
    if arg[0].include? "@"
      arg1 = arg[1]
      if hash_content
        arg1.gsub!(/\{\}/, hash_content)
      end
      after += "x#{level}.instance_eval { #{arg[0]} = #{arg1} }\n"
    else
      args_new << ["#{arg[0]}: #{arg[1]}"]
    end
  end
  args_new = args_new.join ", "

  if args.length == 0
    args_new = body.gsub("#", "")
  end
  if hash_content
    args_new.gsub!(/\{\}/, hash_content)
  end

  func = "#{head}.new(#{args_new})"
  if head == "URI::HTTPS"
    func = "URI.parse(\"#{body}\")"
  end
  if head == "OAuth::Consumer"
    func = "OAuth::Consumer.new('foo', 'bar')"
  end
  if head == "OAuth::AccessToken"
    func = "OAuth::AccessToken.new('')"
  end
  if head == "Net::HTTPOK"
    func = "nil"
  end

  "#{prev}x#{level} = #{func}\n#{after}"
end

print deinspect(str.split("\n").join(""))