module TrackingNumber::ChecksumValidations
Public Class Methods
validates_mod10?(sequence, check_digit, extras = {})
click to toggle source
# File lib/tracking_number/checksum_validations.rb, line 35 def validates_mod10?(sequence, check_digit, extras = {}) total = 0 sequence.chars.each_with_index do |c, i| x = if c[/[0-9]/] # numeric c.to_i else (c[0].ord - 3) % 10 end if extras[:odds_multiplier] && i.odd? x *= extras[:odds_multiplier].to_i elsif extras[:evens_multiplier] && i.even? x *= extras[:evens_multiplier].to_i end total += x end check = (total % 10) check = (10 - check) unless (check.zero?) return (check.to_i == check_digit.to_i) end
validates_mod7?(sequence, check_digit, extras = {})
click to toggle source
# File lib/tracking_number/checksum_validations.rb, line 59 def validates_mod7?(sequence, check_digit, extras = {}) # standard mod 7 check return true if sequence.to_i % 7 == check_digit.to_i end
validates_s10?(sequence, check_digit, extras = {})
click to toggle source
# File lib/tracking_number/checksum_validations.rb, line 4 def validates_s10?(sequence, check_digit, extras = {}) weighting = [8,6,4,2,3,5,9,7] total = 0 sequence.chars.to_a.zip(weighting).each do |(a,b)| total += a.to_i * b.to_i end remainder = total % 11 check = case remainder when 1 0 when 0 5 else 11 - remainder end return check.to_i == check_digit.to_i end
validates_sum_product_with_weightings_and_modulo?(sequence, check_digit, extras = {})
click to toggle source
# File lib/tracking_number/checksum_validations.rb, line 25 def validates_sum_product_with_weightings_and_modulo?(sequence, check_digit, extras = {}) weighting = extras[:weightings] || [] total = 0 sequence.chars.to_a.zip(weighting).each do |(a,b)| total += a.to_i * b end return (total % extras[:modulo1] % extras[:modulo2]) == check_digit.to_i end