Module: CouponCode

Defined in:
lib/coupon_code.rb,
lib/coupon_code/version.rb

Constant Summary collapse

SYMBOL = 
"0123456789ABCDEFGHJKLMNPQRTUVWXY"
PARTS = 
3
LENGTH = 
4
VERSION = 
"0.0.3".freeze

Class Method Summary collapse

Class Method Details

.checkdigit_alg_1(orig, check) ⇒ Object 



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# File 'lib/coupon_code.rb', line 37

def self.checkdigit_alg_1(orig, check)
  orig.chars.each_with_index do |c, _|
    k = SYMBOL.index(c)
    check = check * 19 + k
  end
  SYMBOL[check % 31]
end

.generate(options = {parts: PARTS, part_length: LENGTH}) ⇒ Object 



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# File 'lib/coupon_code.rb', line 10

def self.generate(options = {parts: PARTS, part_length: LENGTH})
  num_parts = options.delete(:parts)
  length_of_parts = options.delete(:part_length) || LENGTH

  parts = []
  (1..num_parts).each do |i|
    part = ""
    (1...length_of_parts).each { part << random_symbol }
    part << checkdigit_alg_1(part, i)
    parts << part
  end
  parts.join("-")
end

.random_symbol ⇒ Object 



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# File 'lib/coupon_code.rb', line 45

def self.random_symbol
  SYMBOL[rand(SYMBOL.length)]
end

.validate(orig, num_parts = PARTS, part_length = LENGTH) ⇒ Object 



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# File 'lib/coupon_code.rb', line 24

def self.validate(orig, num_parts = PARTS, part_length = LENGTH)
  code = orig.upcase
  code.gsub!(/[^#{SYMBOL}]+/o, "")
  parts = code.scan(/[#{SYMBOL}]{#{part_length}}/)
  return if parts.length != num_parts
  parts.each_with_index do |part, i|
    data = part[0...(part_length - 1)]
    check = part[-1]
    break if check != checkdigit_alg_1(data, i + 1)
  end
  parts.join("-")
end