Old Dominion support

couriers/old_dominion.json

@@ -0,0 +1,63 @@
+{
+  "name": "Old Dominion Freight Line",
+  "courier_code": "old_dominion",
+  "tracking_numbers": [
+    {
+      "name": "Old Dominion",
+      "regex": [
+        "\\s*(?<SerialNumber>",
+        "(7\\s*7\\s*[78]\\s*|0\\s*7\\s*2\\s*|7\\s*8\\s*0\\s*)",
+        "([0-9]\\s*){7}",
+        ")",
+        "(?<CheckDigit>[0-9]\\s*)"
+      ],
+      "validation": {
+        "checksum": {
+          "name": "luhn"
+        }
+      },
+      "tracking_url": "https://www.odfl.com/us/en/tools/trace-track-ltl-freight/trace.html?proNumbers=%s",
+      "test_numbers": {
+        "valid": [
+          "07209562763",
+          " 0 7 2 0 9 5 6 2 7 6 3 ",
+          "77767553207",
+          "77806528897",
+          "78045768393"
+        ],
+        "invalid": [
+          "07209562773",
+          "79927398713",
+          "10000000000"
+        ]
+      }
+    },
+    {
+      "name": "Old Dominion Guaranteed Shipment",
+      "regex": [
+        "\\s*(?<SerialNumber>",
+        "8\\s*0\\s*",
+        "([0-9]\\s*){8}",
+        ")",
+        "(?<CheckDigit>[0-9]\\s*)"
+      ],
+      "validation": {
+        "checksum": {
+          "name": "luhn"
+        }
+      },
+      "tracking_url": "https://www.odfl.com/us/en/tools/trace-track-ltl-freight/trace.html?proNumbers=%s",
+      "test_numbers": {
+        "valid": [
+          "80003280379",
+          " 8 0 0 0 3 2 8 0 3 7 9 ",
+          "80993847369"
+        ],
+        "invalid": [
+          "80003280389",
+          "10000000000"
+        ]
+      }
+    }
+  ]
+}

spec/spec_helper.rb

@@ -14,6 +14,29 @@ module TrackingNumber
   module ChecksumValidations
     class << self
       # DEV NOTE: Add new checksum validation methods here while developing
+
+      def validates_luhn?(sequence, check_digit, extras = {})
+        total = 0
+        sequence.chars.reverse.each_with_index do |c, i|
+          x = c.to_i
+
+          if i.even?
+            x *= 2
+          end
+
+          if x > 9
+            x -= 9
+          end
+
+          total += x
+        end
+
+        check = (total % 10)
+        check = (10 - check) unless (check.zero?)
+
+        return (check.to_i == check_digit.to_i)
+      end
+
     end
   end
 end
@@ -103,4 +126,4 @@ def should_fail_on_check_digit_changes(valid_number)
   invalid_number = digits.join
   t = TrackingNumber.new(invalid_number)
   expect(t.valid?).to be_falsy, "#{invalid_number} reported as a valid #{t.class}, and it shouldn't be"
-end
+end