Class: SecurityIdentifiers::ISIN

Inherits:
Base
  • Object
show all
Defined in:
lib/security_identifiers/isin.rb

Instance Attribute Summary

Attributes inherited from Base

#original_check_digit

Instance Method Summary collapse

Methods inherited from Base

#to_s, #valid?

Constructor Details

#initialize(str) ⇒ ISIN

Returns a new instance of ISIN.

Raises:



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# 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

Instance Method Details

#check_digit ⇒ Object 



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# 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