module IcoValidation

Public Class Methods

valid_ico?(ico) click to toggle source

# File lib/ico-validator/ico_validation.rb, line 2
def self.valid_ico?(ico)
  ico = ico.to_s
  ico.length == 8 && ico.match(/^\d+$/) && last_number_valid?(ico)
end

Private Class Methods

calculate_valid_last_number(ico) click to toggle source

# File lib/ico-validator/ico_validation.rb, line 13
def self.calculate_valid_last_number(ico)
  sum = (0..6).inject(0) { |sum, i| sum + ico[i].to_i * (8 - i) }
  mod = sum % 11

  case mod
  when 0, 10 then 1
  when 1     then 0
  else 11 - mod
  end
end

last_number_valid?(ico) click to toggle source

# File lib/ico-validator/ico_validation.rb, line 9
def self.last_number_valid?(ico)
  ico[7].to_i == calculate_valid_last_number(ico)
end