Merge 509a1a6 into 9408f65

README.md

@@ -78,6 +78,9 @@ Usage
 ```php
 // For network 192.168.112.203/23
 $sub = new IPv4\SubnetCalculator('192.168.112.203', 23);
+// Or
+$sub = IPv4\SubnetCalculator::factory('192.168.112.203/23');
+
 ```
 
 ### Various Network Information

src/SubnetCalculator.php

@@ -63,6 +63,19 @@ public function __construct($ip_address, $network_size, SubnetReportInterface $r
         $this->report       = $report ?: new SubnetReport();
     }
 
+    /**
+     * SubnetCalculator factory when IP address is written with subnetmask (ex. "192.168.1.120/24")
+     *
+     * @param string $ip_address_with_network_size "192.168.1.120/24"
+     * @param SubnetReportInterface|null $report
+     * @return SubnetCalculator
+     */
+    public static function factory($ip_address_with_network_size, SubnetReportInterface $report = null)
+    {
+        $network = explode('/', $ip_address_with_network_size);
+        return new self($network[0], $network[1], $report);
+    }
+
     /* **************** *
      * PUBLIC INTERFACE
      * **************** */

tests/SubnetCalculatorTest.php

@@ -1551,4 +1551,16 @@ public function dataProviderForIpAddressesNotInSubnet()
             ['192.168.112.203', 32, '192.168.112.204'],
         ];
     }
+
+    /**
+     * @testCase factory
+     */
+    public function testSubnetCalculatorFactory()
+    {
+        // Given
+        $instance = IPv4\SubnetCalculator::factory('192.168.1.1/24');
+
+        // Then
+        $this->assertInstanceOf('IPv4\SubnetCalculator', $instance);
+    }
 }