文字列の猫語化

kittenizer.rb

class String
  def kittenize
    result = self
    DICTIONARY.each do |word|
      result.gsub!(word[0], word[1])
    end
  end

  def kittenize!
    DICTIONARY.each do |word|
      self.gsub(word[0], word[1])
    end
  end

  private
    DICTIONARY = [
      [/([^。])(。+)/, '\1にゃ\2'],
      [/な/, "にゃ"],
      [/ナ/, "ニャ"],
      [/ま/, "みゃ"],
      [/マ/, "ミャ"],
      [/よう/, "にゃう"],
      [/ヨウ/, "ニャウ"],
    ]
end

str = "てすと1。。"
puts str
result = str.kittenize!
puts str
puts result

str = "てすと2。。"
puts str
str.kittenize!
puts str

str = "てすと3。。"
puts str
str.gsub! /([^。])(。+)/, '\1にゃ\2'
puts str