validator.rb in vindetta-0.16.0

- old
+ new

@@ -1,17 +1,23 @@
-require "active_model"
-
 module Vindetta
-  class Validator < ActiveModel::Validator
+  class Validator
     LENGTH = 17
+    CHECK_DIGIT_INDEX = 8
+    MAP = "0123456789X".chars
+    WEIGHTS = "8765432X098765432".chars
 
     def self.run(value)
-      Vin.new(value).valid?
+      return false unless value.length == LENGTH
+
+      check_digit(value) == value[CHECK_DIGIT_INDEX]
     end
 
-    def validate(record)
-      record.errors.add(:value, I18n.t("invalid_length")) if record.value.length != LENGTH
+    def self.check_digit(value)
+      check_digit = value.chars[8]
+      calculated = value.chars.map.with_index do |c, i|
+        Transliterator::run(c) * MAP.find_index(WEIGHTS[i])
+      end.sum
 
-      # TODO: Check format
+      MAP[calculated % 11]
     end
   end
 end