Contents

require 'valvat/checksum'

class Valvat
  module Checksum
    class ES < Base
      NATURAL_PERSON_CHARS       = %w(T R W A G M Y F P D X B N J Z S Q V H L C K E)
      LEGAL_FOREIGN_PERSON_CHARS = [false] + %w(A B C D E F G H I J)

      def check_digit
        natural_person? ? check_digit_natural_person : check_digit_legal_person
      end

      def check_digit_natural_person
        NATURAL_PERSON_CHARS[figures_str.to_i.modulo(23)]
      end

      def check_digit_legal_person
        chk = 10 - figures.reverse.each_with_index.map do |fig, i|
          (fig*(i.modulo(2) == 0 ? 2 : 1)).to_s.split("").inject(0) { |sum, n| sum + n.to_i }
        end.inject(:+).modulo(10)
        legal_foreign_person? ? 
          LEGAL_FOREIGN_PERSON_CHARS[chk] : 
          (chk == 10 ? 0 : chk)
      end

      def given_check_digit
        natural_person? || legal_foreign_person? ? str_wo_country[-1] : super
      end

      def str_wo_country
        str = super
        str[0] =~ /\d/ ? str : str[1..-1]
      end

      def natural_person?
        !!(vat.to_s_wo_country =~ /\A[\d]{8}[ABCDEFGHJKLMNPQRSTVWXYZ]\Z/) ||
        !!(vat.to_s_wo_country =~ /\A[KLMX][\d]{7}[ABCDEFGHJKLMNPQRSTVWXYZ]\Z/)
      end

      def legal_foreign_person?
        !!(vat.to_s_wo_country =~ /\A[NPQRSW][\d]{7}[ABCDEFGHIJ]\Z/)
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
valvat-0.5.0	lib/valvat/checksum/es.rb