class SecurityIdentifiers::ISIN

Public Class Methods

new(str) click to toggle source
# File lib/security_identifiers/isin.rb, line 3
def initialize(str)
  raise InvalidFormat if str.nil?

  match_data = str.upcase.match(/^(([A-Z]{2})([A-Z0-9]{9}))(\d{1})?$/)

  raise InvalidFormat if match_data.nil?

  @identifier, @country_code, @nsin, @original_check_digit = match_data.captures

  fix! if @original_check_digit.nil?
end

Public Instance Methods

check_digit() click to toggle source
# File lib/security_identifiers/isin.rb, line 15
def check_digit
  @check_digit ||= begin
    first_group  = digit_groups[0].map { |d| d * 2 }
    second_group = digit_groups[1]

    sum = (first_group + second_group).join.each_char.inject(0) { |result, i| result + i.to_i }

    mod_10(sum)
  end
end

Private Instance Methods

digit_groups() click to toggle source
# File lib/security_identifiers/isin.rb, line 28
def digit_groups
  if digits.size.even?
    [even_values, odd_values]
  else
    [odd_values, even_values]
  end
end