/vendor/plugins/salty_slugs/lib/salty_slugs/transliteration.rb

# encoding: utf-8

module SaltySlugs
  # Russian transliteration 
  #
  # ?????????????? ??? ???? ???????? ????????
  module Transliteration
    extend self
  
    # Transliteration heavily based on rutils gem by Julian "julik" Tarkhanov and Co.
    # <http://rutils.rubyforge.org/>
    # Cleaned up and optimized.
  
    LOWER = {
       "?"=>"i","?"=>"g","?"=>"yo","?"=>"#","?"=>"e",
       "?"=>"yi","?"=>"a","?"=>"b",
       "?"=>"v","?"=>"g","?"=>"d","?"=>"e","?"=>"zh",
       "?"=>"z","?"=>"i","?"=>"y","?"=>"k","?"=>"l",
       "?"=>"m","?"=>"n","?"=>"o","?"=>"p","?"=>"r",
       "?"=>"s","?"=>"t","?"=>"u","?"=>"f","?"=>"h",
       "?"=>"ts","?"=>"ch","?"=>"sh","?"=>"sch","?"=>"'",
       "?"=>"y","?"=>"","?"=>"e","?"=>"yu","?"=>"ya"
    }.freeze
  
    UPPER = {
      "?"=>"G","?"=>"YO","?"=>"E","?"=>"YI","?"=>"I",
      "?"=>"A","?"=>"B","?"=>"V","?"=>"G",
       "?"=>"D","?"=>"E","?"=>"ZH","?"=>"Z","?"=>"I",
       "?"=>"Y","?"=>"K","?"=>"L","?"=>"M","?"=>"N",
       "?"=>"O","?"=>"P","?"=>"R","?"=>"S","?"=>"T",
       "?"=>"U","?"=>"F","?"=>"H","?"=>"TS","?"=>"CH",
       "?"=>"SH","?"=>"SCH","?"=>"'","?"=>"Y","?"=>"",
       "?"=>"E","?"=>"YU","?"=>"YA",
    }.freeze

    # Transliterate a string with russian characters
    #
    # ?????????? ??????, ? ??????? ??? ????? ???????? ???????? ???????? ?? ??????? ?? ???????? ????????
    def transliterate(str)
      chars = str.split(//)    
    
      result = ""

      chars.each_with_index do |char, index|
        if UPPER.has_key?(char) && LOWER.has_key?(chars[index+1])
          # combined case
          result << UPPER[char].downcase.capitalize
        elsif UPPER.has_key?(char)
          result << UPPER[char]
        elsif LOWER.has_key?(char)
          result << LOWER[char]
        else
          result << char
        end
      end

      return result
    end
  end
end