gistfile1.rb

#place this in config/locales/translit.rb

# encoding: utf-8

# I18n transliteration delegates to Russian::Transliteration (we're unable
# to use common I18n transliteration tables with Russian)
#
# Правило транслитерации для I18n использует Russian::Transliteration
# (использовать обычный механизм и таблицу транслитерации I18n с
# русским языком не получится)
{
  :ru => {
    :i18n => {
      :transliterate => {
        :rule => lambda { |str| Transliteration.transliterate(str) }
      }
    }
  }
}



#and this into libs with file name transliteration.rb
#don't forget to enable autoloading files from libs by adding next line into application.rb
#config.autoload_paths += %W(#{config.root}/lib)


# encoding: utf-8

# Russian transliteration
#
# Транслитерация для букв русского алфавита
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_SINGLE = {
    "і"=>"i","ґ"=>"g","ё"=>"yo","№"=>"#","є"=>"e",
    "ї"=>"yi","а"=>"a","б"=>"b",
    "в"=>"v","г"=>"g","д"=>"d","е"=>"e","ж"=>"zh",
    "з"=>"z","и"=>"i","й"=>"y","к"=>"k","л"=>"l",
    "м"=>"m","н"=>"n","о"=>"o","п"=>"p","р"=>"r",
    "с"=>"s","т"=>"t","у"=>"u","ф"=>"f","х"=>"h",
    "ц"=>"ts","ч"=>"ch","ш"=>"sh","щ"=>"sch","ъ"=>"'",
    "ы"=>"y","ь"=>"","э"=>"e","ю"=>"yu","я"=>"ya",
  }
  LOWER_MULTI = {
    "ье"=>"ie",
    "ьё"=>"ie",
  }

  UPPER_SINGLE = {
    "Ґ"=>"G","Ё"=>"YO","Є"=>"E","Ї"=>"YI","І"=>"I",
    "А"=>"A","Б"=>"B","В"=>"V","Г"=>"G",
    "Д"=>"D","Е"=>"E","Ж"=>"ZH","З"=>"Z","И"=>"I",
    "Й"=>"Y","К"=>"K","Л"=>"L","М"=>"M","Н"=>"N",
    "О"=>"O","П"=>"P","Р"=>"R","С"=>"S","Т"=>"T",
    "У"=>"U","Ф"=>"F","Х"=>"H","Ц"=>"TS","Ч"=>"CH",
    "Ш"=>"SH","Щ"=>"SCH","Ъ"=>"'","Ы"=>"Y","Ь"=>"",
    "Э"=>"E","Ю"=>"YU","Я"=>"YA",
  }
  UPPER_MULTI = {
    "ЬЕ"=>"IE",
    "ЬЁ"=>"IE",
  }

  LOWER = (LOWER_SINGLE.merge(LOWER_MULTI)).freeze
  UPPER = (UPPER_SINGLE.merge(UPPER_MULTI)).freeze
  MULTI_KEYS = (LOWER_MULTI.merge(UPPER_MULTI)).keys.sort_by {|s| s.length}.reverse.freeze

  # Transliterate a string with russian characters
  #
  # Возвращает строку, в которой все буквы русского алфавита заменены на похожую по звучанию латиницу
  def transliterate(str)
    chars = str.scan(%r{#{MULTI_KEYS.join '|'}|\w|.})

    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

    result
  end
end