Ruby, Rails, Транслитерация для Яндекса, yandex translit

yandex_translit.rb

# encoding: utf-8

# Russian for Yandex. Based on:
# (c) Yaroslav Markin, Julian "julik" Tarkhanov and Co
# https://github.com/yaroslav/russian/blob/master/lib/russian/transliteration.rb

# WARN я не очень согласен с правилом для буквы Щ (SHH)- поэтому используется SCH

# SAVE IT HERE:
# :rails_root/config/locales/yandex_translit.rb

module RailsI18n
  module Transliteration
    module Russian
      class << self
        def rule
          lambda do |string|
            chars = string.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

        private

        # use instance variables instead of constants to prevent warnings
        # on re-evaling after I18n.reload!

        def upper
          @upper ||= begin
            upper_single = {
              "Ё"=>"E","Э"=>"E","Ю"=>"YU","Я"=>"YA",
              "Ж"=>"ZH","Х"=>"KH","Й"=>"J",
              "Ц"=>"TS","Ш"=>"SH","Щ"=>"SCH","Ь"=>"","Ъ"=>"",

              "Ґ"=>"G","Є"=>"E","Ї"=>"YI","І"=>"I",
              "А"=>"A","Б"=>"B","В"=>"V","Г"=>"G",
              "Д"=>"D","Е"=>"E","З"=>"Z","И"=>"I",
              "К"=>"K","Л"=>"L","М"=>"M","Н"=>"N",
              "О"=>"O","П"=>"P","Р"=>"R","С"=>"S",
              "Т"=>"T","У"=>"U","Ф"=>"F","Ч"=>"CH","Ы"=>"Y"
            }

            (upper_single.merge(upper_multi)).freeze
          end
        end

        def lower
          @lower ||= begin
            lower_single = {
              "ё"=>"e","э"=>"e","ю"=>"yu","я"=>"ya",
              "ж"=>"zh","х"=>"kh","й"=>"j",
              "ц"=>"ts","ш"=>"sh","щ"=>"sch","ь"=>"","ъ"=>"",

              "і"=>"i","ґ"=>"g","№"=>"#",
              "ї"=>"yi","а"=>"a","б"=>"b",
              "в"=>"v","г"=>"g","д"=>"d","е"=>"e",
              "з"=>"z","и"=>"i","к"=>"k","л"=>"l",
              "м"=>"m","н"=>"n","о"=>"o","п"=>"p",
              "р"=>"r", "с"=>"s","т"=>"t","у"=>"u",
              "ф"=>"f","ч"=>"ch","ы"=>"y"
            }

            (lower_single.merge(lower_multi)).freeze
          end
        end

        def upper_multi
          @upper_multi ||= { "ЬЕ"=>"IE", "ЬЁ"=>"IE" }
        end

        def lower_multi
          @lower_multi ||= { "ье"=>"ie", "ьё"=>"ie" }
        end

        def multi_keys
          @multi_keys ||= (lower_multi.merge(upper_multi)).keys.sort_by {|s| s.length}.reverse.freeze
        end
      end
    end
  end
end

{ :ru => {
    :i18n => {
      :transliterate => {
        :rule => RailsI18n::Transliteration::Russian.rule }}}}

plain tests based on gem "the_string_to_slug"

я не очень согласен с правилом для буквы Щ (SHH)- поэтому используется SCH

ENV["RAILS_ENV"] ||= 'development'
require File.expand_path("../../../config/environment", __FILE__)

# I18n
#
# ё => yo
# э => e
# ю => yu
# я => ya
# ж => zh
# х => h
# й => y
# ц => ts
# ш => sh
# щ => sch
# ь => 
# ъ => '
p "I18n/Russian by Markin"
p "SRC: Ё Э Ю Я Ж Х Й Ц Ш Щ Ь Ъ"
p "REQ: yo-e-yu-ya-zh-h-y-ts-sh-sch"
p "Ё Э Ю Я Ж Х Й Ц Ш Щ Ь Ъ".to_slug_param
p "Ё Э Ю Я Ж Х Й Ц Ш Щ Ь Ъ".to_slug_param == "yo-e-yu-ya-zh-h-y-ts-sh-sch"

# YANDEX (my version in fact)
#
# ё => e
# э => e
# ю => yu ju
# я => ya (ja)
# ж => zh
# х => kh
# й => j
# ц => ts
# ш => sh
# щ => sch
# ь => 
# ъ =>
p "I18n/Russian for Yandex"
p "SRC: Ё Э Ю Я Ж Х Й Ц Ш Щ Ь Ъ"
p "REQ: e-e-yu-ya-zh-kh-j-ts-sh-sch"
p "Ё Э Ю Я Ж Х Й Ц Ш Щ Ь Ъ".to_slug_param
p "Ё Э Ю Я Ж Х Й Ц Ш Щ Ь Ъ".to_slug_param == "e-e-yu-ya-zh-kh-j-ts-sh-sch"