Added ConstantsAsMembers trait

Author: Petr Knap

README.md

@@ -51,15 +51,10 @@ And now the **same code with Enum** instead of Constants:
 ```php
 <?php
 
-class MyBoolean extends \PetrKnap\Php\Enum\Enum
+class MyBoolean extends \PetrKnap\Php\Enum\ConstEnum
 {
-    protected function members()
-    {
-        return [
-            "MY_TRUE" => 1,
-            "MY_FALSE" => 2
-        ];
-    }
+    const MY_TRUE = 1;
+    const MY_FALSE = 2;
 }
 
 function isTrue(MyBoolean $myBoolean)
@@ -87,20 +82,15 @@ isTrue(false);                 // uncaught type error - OK
 ```php
 <?php
 
-class DayOfWeek extends \PetrKnap\Php\Enum\Enum
+class DayOfWeek extends \PetrKnap\Php\Enum\ConstEnum
 {
-    protected function members()
-    {
-        return [
-            "SUNDAY" => 0,
-            "MONDAY" => 1,
-            "TUESDAY" => 2,
-            "WEDNESDAY" => 3,
-            "THURSDAY" => 4,
-            "FRIDAY" => 5,
-            "SATURDAY" => 6
-        ];
-    }
+    const SUNDAY = 0;
+    const MONDAY = 1;
+    const TUESDAY = 2;
+    const WEDNESDAY = 3;
+    const THURSDAY = 4;
+    const FRIDAY = 5;
+    const SATURDAY = 6;
 }
 ```
 

src/ConstantsAsMembers.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace PetrKnap\Php\Enum;
+
+use ReflectionClass;
+
+trait ConstantsAsMembers
+{
+    /**
+     * @return array
+     */
+    protected function members()
+    {
+        $classReflection = new ReflectionClass(get_called_class());
+
+        return $classReflection->getConstants();
+    }
+}

tests/ConstantsAsMembersTest.php

@@ -0,0 +1,19 @@
+<?php
+
+namespace PetrKnap\Php\Enum\Test;
+
+use PetrKnap\Php\Enum\Test\ConstantsAsMembersTest\MyBoolean;
+
+class ConstantsAsMembersTest extends \PHPUnit_Framework_TestCase
+{
+    public function testMembersWorks()
+    {
+        $this->assertEquals(
+            [
+                'MY_TRUE' => 1,
+                'MY_FALSE' => 2,
+            ],
+            MyBoolean::getMembers()
+        );
+    }
+}

tests/ConstantsAsMembersTest/MyBoolean.php

@@ -0,0 +1,18 @@
+<?php
+
+namespace PetrKnap\Php\Enum\Test\ConstantsAsMembersTest;
+
+use PetrKnap\Php\Enum\ConstantsAsMembers;
+use PetrKnap\Php\Enum\Enum;
+
+/**
+ * @method static MyBoolean MY_TRUE()
+ * @method static MyBoolean MY_FALSE()
+ */
+class MyBoolean extends Enum
+{
+    use ConstantsAsMembers;
+
+    const MY_TRUE = 1;
+    const MY_FALSE = 2;
+}