Pig Latin

pig_latin.rb

class PigLatin
  def self.translate(string)
    string.split(' ').map do |word|
      if /yt|xr/ =~ word[0..1]
        word << 'ay'
      elsif /ye/ =~ word[0..1]
        word.chars.rotate.join << 'ay'
      elsif /thr|sch/ =~ word[0..2]
        word.chars.rotate(3).join << 'ay'
      elsif /ch|qu|th/ =~ word[0..1]
        word.chars.rotate(2).join << 'ay'
      elsif /ch|qu/ =~ word[0..2]
        word.chars.rotate(3).join << 'ay'
      elsif %w(a e i o u).include? word[0]
        word << 'ay'
      else
        word.chars.rotate.join << 'ay'
      end
    end.join(' ')
  end
end