# forest => orestfay
# apple  => appleway
# brunch => unchbray

class PigLatinTranslator
  VOWELS = /[aeiou]/i
  NONVOWELS = /[^aeiou]+/i
  PUNC = /\w+|\W+/

  def translate word
    upcase = word[0] == word[0].upcase

    if VOWELS === word[0]
      word + "way"
    else
      group = NONVOWELS.match(word)[0]
      translated_word = word[group.size..-1] + group + "ay"
      upcase ? translated_word.capitalize : translated_word
    end
  end

  def translate_sentence sentence
    words = sentence.scan(PUNC)
    words.map { |w| word?(w) ? translate(w) : w }.join
  end

  def word? word
    /\w/ === word[0]
  end
end

puts PigLatinTranslator.new.translate("forest")
puts PigLatinTranslator.new.translate("apple")
puts PigLatinTranslator.new.translate("brunch")
puts PigLatinTranslator.new.translate("ate")
puts PigLatinTranslator.new.translate_sentence("Marley eats an apple")
puts PigLatinTranslator.new.translate_sentence("Marley, eat an apple!")