# File lib/action_view/helpers/number_helper.rb, line 52
      def number_to_phone(number, options = {})
        return unless number

        begin
          Float(number)
        rescue ArgumentError, TypeError
          raise InvalidNumberError, number
        end if options[:raise]

        number       = number.to_s.strip
        options      = options.symbolize_keys
        area_code    = options[:area_code]
        delimiter    = options[:delimiter] || "-"
        extension    = options[:extension]
        country_code = options[:country_code]

        if area_code
          number.gsub!(/(\d{1,3})(\d{3})(\d{4}$)/,"(\\1) \\2#{delimiter}\\3")
        else
          number.gsub!(/(\d{0,3})(\d{3})(\d{4})$/,"\\1#{delimiter}\\2#{delimiter}\\3")
          number.slice!(0, 1) if number.starts_with?('-')
        end

        str = []
        str << "+#{country_code}#{delimiter}" unless country_code.blank?
        str << number
        str << " x #{extension}" unless extension.blank?
        ERB::Util.html_escape(str.join)
      end