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

#fix!, #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 5

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
end

Instance Method Details

#check_digit ⇒ Object 



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# File 'lib/security_identifiers/isin.rb', line 15

def check_digit
  longest, shortest = if even_values.last == digits.last
     [even_values, odd_values]
  else
    [odd_values, even_values]
  end

  longest = longest.map { |i| i * 2 }
  values  = (longest.concat(shortest)).to_s.scan(/./).map(&:to_i)
  sum     = values.inject(&:+)

  (10 - (sum % 10)) % 10
end