Number Transliteration

number_transliterator.rb

require 'twitter_cldr'

class NumberTransliterator
  class << self

    def to_english_str(str)
      str.each_char.map do |char|
        transliterate_char(char) || char
      end.join
    end

    private

    def transliterate_char(char)
      numeric_numbering_systems.inject(nil) do |ret, numeric_system|
        index = system_for(numeric_system).digits.find_index do |digit|
          char == digit
        end

        break index.to_s if index
      end
    end

    def system_for(system_name)
      systems[system_name] ||=
        TwitterCldr::Shared::NumberingSystem.for_name(system_name)
    end

    def systems
      @systems ||= {}
    end

    def numeric_numbering_systems
      resource.each_with_object([]) do |(name, system), ret|
        ret << name if system[:type] == 'numeric'
      end
    end

    def resource
      TwitterCldr.get_resource(:shared, :numbering_systems)[:numbering_systems]
    end

  end
end

puts NumberTransliterator.to_english_str('২০১৪-০৪-০৫ ০৪:১৬:০৩০')
puts NumberTransliterator.to_english_str('٢٠١٤-١٠-٢٦ ٢٢:١٠:٠٢٦')