feature #20923 #20921 [Config] Provide shorthand methods for ArrayNodeDefinition::pr… (skafandri)

This PR was squashed before being merged into the 3.3-dev branch (closes #20923).

Discussion
----------

#20921 [Config] Provide shorthand methods for ArrayNodeDefinition::pr…

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #20921
| License       | MIT

Commits
-------

22b8490 #20921 [Config] Provide shorthand methods for ArrayNodeDefinition::pr…

src/Symfony/Component/Config/Definition/Builder/ArrayNodeDefinition.php

@@ -79,6 +79,62 @@ class ArrayNodeDefinition extends NodeDefinition implements ParentNodeDefinition
         return $this->prototype = $this->getNodeBuilder()->node(null, $type)->setParent($this);
     }
 
+    /**
+     * @return VariableNodeDefinition
+     */
+    public function variablePrototype()
+    {
+        return $this->prototype('variable');
+    }
+
+    /**
+     * @return ScalarNodeDefinition
+     */
+    public function scalarPrototype()
+    {
+        return $this->prototype('scalar');
+    }
+
+    /**
+     * @return BooleanNodeDefinition
+     */
+    public function booleanPrototype()
+    {
+        return $this->prototype('boolean');
+    }
+
+    /**
+     * @return IntegerNodeDefinition
+     */
+    public function integerPrototype()
+    {
+        return $this->prototype('integer');
+    }
+
+    /**
+     * @return FloatNodeDefinition
+     */
+    public function floatPrototype()
+    {
+        return $this->prototype('float');
+    }
+
+    /**
+     * @return ArrayNodeDefinition
+     */
+    public function arrayPrototype()
+    {
+        return $this->prototype('array');
+    }
+
+    /**
+     * @return EnumNodeDefinition
+     */
+    public function enumPrototype()
+    {
+        return $this->prototype('enum');
+    }
+
     /**
      * Adds the default value if the node is not set in the configuration.
      *

src/Symfony/Component/Config/Tests/Definition/Builder/ArrayNodeDefinitionTest.php

@@ -227,6 +227,48 @@ class ArrayNodeDefinitionTest extends \PHPUnit_Framework_TestCase
         $this->assertFalse($this->getField($node, 'normalizeKeys'));
     }
 
+    public function testPrototypeVariable()
+    {
+        $node = new ArrayNodeDefinition('root');
+        $this->assertEquals($node->prototype('variable'), $node->variablePrototype());
+    }
+
+    public function testPrototypeScalar()
+    {
+        $node = new ArrayNodeDefinition('root');
+        $this->assertEquals($node->prototype('scalar'), $node->scalarPrototype());
+    }
+
+    public function testPrototypeBoolean()
+    {
+        $node = new ArrayNodeDefinition('root');
+        $this->assertEquals($node->prototype('boolean'), $node->booleanPrototype());
+    }
+
+    public function testPrototypeInteger()
+    {
+        $node = new ArrayNodeDefinition('root');
+        $this->assertEquals($node->prototype('integer'), $node->integerPrototype());
+    }
+
+    public function testPrototypeFloat()
+    {
+        $node = new ArrayNodeDefinition('root');
+        $this->assertEquals($node->prototype('float'), $node->floatPrototype());
+    }
+
+    public function testPrototypeArray()
+    {
+        $node = new ArrayNodeDefinition('root');
+        $this->assertEquals($node->prototype('array'), $node->arrayPrototype());
+    }
+
+    public function testPrototypeEnum()
+    {
+        $node = new ArrayNodeDefinition('root');
+        $this->assertEquals($node->prototype('enum'), $node->enumPrototype());
+    }
+
     public function getEnableableNodeFixtures()
     {
         return array(