Multi part validation

README.md

@@ -42,8 +42,19 @@ Or install it yourself as:
 
 You can change the number of parts of the generated code by passing an option hash value like:
 
-    >> CouponCode.generate(parts: 4)
+    >> code = CouponCode.generate(parts: 4)
     => "1K7Q-CTFM-LMTC-DLGP"
+    >> CouponeCode.validate(code, parts: 4)
+    => "1K7Q-CTFM-LMTC-DLGP"
+
+You can also set the default number of parts you are working with so that you don't have to continually send the parts value as an option:
+
+    >> CouponCode.default_parts(5)
+    => 5
+    >> code = CouponCode.generate
+    => "CNYF-K4AH-L5PF-0RU7-5L0Q"
+    >> CouponCode.validate(code)
+    => "CNYF-K4AH-L5PF-0RU7-5L0Q"
 
 ## Testing
 
@@ -74,4 +85,4 @@ MIT. See [LICENSE][license] for more details.
 [node-couponcode]: https://github.com/chilts/node-coupon-code
 [license]: https://github.com/baxang/coupon-code/blob/master/LICENSE.txt
 [README-kr]: https://github.com/baxang/coupon-code/blob/master/README-ko.md
-[rubygems]: https://rubygems.org/gems/coupon_code
+[rubygems]: https://rubygems.org/gems/coupon_code

lib/coupon_code.rb

@@ -3,11 +3,11 @@
 require 'digest/sha1'
 
 module CouponCode
-  SYMBOL = '0123456789ABCDEFGHJKLMNPQRTUVWXY'
-  PARTS  = 3
-  LENGTH = 4
+  SYMBOL  = '0123456789ABCDEFGHJKLMNPQRTUVWXY'
+  LENGTH  = 4
+  @@parts = 3
 
-  def self.generate(options = { parts: PARTS })
+  def self.generate(options = { parts: @@parts })
     num_parts = options.delete(:parts)
     parts = []
     (1..num_parts).each do |i|
@@ -19,19 +19,27 @@ def self.generate(options = { parts: PARTS })
     parts.join('-')
   end
 
-  def self.validate(orig, num_parts = PARTS)
-    code = orig.upcase
-    code.gsub!(/[^0-9A-Z]+/, '')
-    parts = code.scan(/[0-9A-Z]{#{LENGTH}}/)
+  def self.validate(orig, options = { parts: @@parts })
+    num_parts = options.delete(:parts)
+    code      = orig.upcase.gsub(/[^0-9A-Z]+/, '')
+    parts     = code.scan(/[0-9A-Z]{#{LENGTH}}/)
+
     return if parts.length != num_parts
+
     parts.each_with_index do |part, i|
       data  = part[0...(LENGTH - 1)]
       check = part[-1]
+
       return if check != checkdigit_alg_1(data, i + 1)
     end
+
     parts.join('-')
   end
 
+  def self.default_parts(parts)
+    @@parts = parts
+  end
+
   def self.checkdigit_alg_1(orig, check)
     orig.split('').each_with_index do |c, _|
       k = SYMBOL.index(c)

lib/coupon_code/version.rb

@@ -1,3 +1,3 @@
 module CouponCode
-  VERSION = '0.0.1'
+  VERSION = "0.1.0"
 end

test/coupon_code_test.rb

@@ -52,11 +52,11 @@ def generate(*args)
     end
 
     it 'should accept a short code with correct parts.' do
-      CouponCode.validate('1K7Q-CTFM', 2).wont_be_nil
+      CouponCode.validate('1K7Q-CTFM', parts: 2).wont_be_nil
     end
 
     it 'should reject a short code with wrong parts.' do
-      CouponCode.validate('CTFM-1K7Q', 2).must_be_nil
+      CouponCode.validate('CTFM-1K7Q', parts: 2).must_be_nil
     end
 
     it 'should fix and validate a lowercase code.' do
@@ -76,23 +76,33 @@ def generate(*args)
     end
 
     it 'should valid code-pretest.' do
-      CouponCode.validate('1K7Q', 1).wont_be_nil
-      CouponCode.validate('1K7C', 1).must_be_nil
+      CouponCode.validate("1K7Q", parts: 1).wont_be_nil
+      CouponCode.validate("1K7C", parts: 1).must_be_nil
 
-      CouponCode.validate('1K7Q-CTFM', 2).wont_be_nil
-      CouponCode.validate('1K7Q-CTFW', 2).must_be_nil
+      CouponCode.validate("1K7Q-CTFM", parts: 2).wont_be_nil
+      CouponCode.validate('1K7Q-CTFW', parts: 2).must_be_nil
 
-      CouponCode.validate('1K7Q-CTFM-LMTC', 3).wont_be_nil
-      CouponCode.validate('1K7Q-CTFM-LMT1', 3).must_be_nil
+      CouponCode.validate("1K7Q-CTFM-LMTC", parts: 3).wont_be_nil
+      CouponCode.validate("1K7Q-CTFM-LMT1", parts: 3).must_be_nil
 
-      CouponCode.validate('7YQH-1FU7-E1HX-0BG9', 4).wont_be_nil
-      CouponCode.validate('7YQH-1FU7-E1HX-0BGP', 4).must_be_nil
+      CouponCode.validate("7YQH-1FU7-E1HX-0BG9", parts: 4).wont_be_nil
+      CouponCode.validate("7YQH-1FU7-E1HX-0BGP", parts: 4).must_be_nil
 
-      CouponCode.validate('YENH-UPJK-PTE0-20U6-QYME', 5).wont_be_nil
-      CouponCode.validate('YENH-UPJK-PTE0-20U6-QYMT', 5).must_be_nil
+      CouponCode.validate("YENH-UPJK-PTE0-20U6-QYME", parts: 5).wont_be_nil
+      CouponCode.validate("YENH-UPJK-PTE0-20U6-QYMT", parts: 5).must_be_nil
 
-      CouponCode.validate('YENH-UPJK-PTE0-20U6-QYME-RBK1', 6).wont_be_nil
-      CouponCode.validate('YENH-UPJK-PTE0-20U6-QYME-RBK2', 6).must_be_nil
+      CouponCode.validate("YENH-UPJK-PTE0-20U6-QYME-RBK1", parts: 6).wont_be_nil
+      CouponCode.validate("YENH-UPJK-PTE0-20U6-QYME-RBK2", parts: 6).must_be_nil
+    end
+
+    it "should allow a default part length to be set" do
+      CouponCode.default_parts(5)
+
+      code = CouponCode.generate
+      code.split("-").length.must_equal 5
+      CouponCode.validate(code).must_equal code
+
+      CouponCode.default_parts(3) # Set it back for the rest of the tests
     end
   end
 end