Handle groups in address lists

src/Header/AbstractAddressList.php

@@ -58,13 +58,15 @@ public static function fromString($headerLine)
         }
         // split value on ","
         $fieldValue = str_replace(Headers::FOLDING, ' ', $fieldValue);
+        $fieldValue = preg_replace('/[^:]+:([^;]*);/', '$1,', $fieldValue);
         $values     = str_getcsv($fieldValue, ',');
         array_walk(
             $values,
             function (&$value) {
                 $value = trim($value);
             }
         );
+        $values = array_filter($values);
 
         $addressList = $header->getAddressList();
         foreach ($values as $address) {

test/Header/AddressListHeaderTest.php

@@ -169,4 +169,25 @@ public function testAllowsNoWhitespaceBetweenHeaderAndValue($headerLine, $class)
         $address = $list->get('first@last.zend.com');
         $this->assertEquals('Last, First', $address->getName());
     }
+
+    /**
+     * @dataProvider getAddressListsWithGroup
+     */
+    public function testAddressListWithGroup($input, $count, $sample)
+    {
+        $header = To::fromString($input);
+        $list = $header->getAddressList();
+        $this->assertEquals($count, count($list));
+        if ($count > 0) {
+            $this->assertTrue($list->has($sample));
+        }
+    }
+
+    public function getAddressListsWithGroup()
+    {
+        return [
+            ['To: undisclosed-recipients:;', 0, null],
+            ['To: friends: john@example.com; enemies: john@example.net, bart@example.net;', 3, 'john@example.net'],
+        ];
+    }
 }