class SAN

   # File lib/san.rb
49 def self.complete(six_digit_san)
50   six_digit_san = six_digit_san.to_s
51   return nil unless six_digit_san.length == 6 && six_digit_san.match(/\d{6}/)
52   
53   arr = (0..5).to_a.collect { |i| six_digit_san[i,1].to_i * (7-i) }
54   sum = arr.inject { |sum, n| sum + n }
55   check = 11 - (sum % 11)
56   
57   check = 0   if check == 11
58   check = 'X' if check == 10
59   
60   six_digit_san + check.to_s
61 end

   # File lib/san.rb
13 def initialize(str)
14   @number = str.to_s
15 end

   # File lib/san.rb
43 def self.valid?(san)
44   san = san.to_s
45   san.length == 7 && san == SAN.complete(san[0,6])
46 end

   # File lib/san.rb
38 def to_uk_gln
39   return nil unless valid?
40   EAN13.complete("503067#{@number[0,6]}")
41 end

   # File lib/san.rb
27 def to_us_gln
28   return nil unless valid?
29   EAN13.complete("079999#{@number[0,6]}")
30 end

   # File lib/san.rb
17 def valid?
18   SAN.valid? @number
19 end