Merge parameters

Author: dantleech

lib/Container.php

@@ -191,6 +191,23 @@ public function setParameter($name, $value)
         $this->config[$name] = $value;
     }
 
+    public function mergeParameter($name, array $values)
+    {
+        $actual = $this->getParameter($name);
+
+        if (!is_array($actual)) {
+            throw new \InvalidArgumentException(sprintf(
+                'Cannot merge values on to a scalar parameter "%s"',
+                $name
+            ));
+        }
+
+        $this->setParameter($name, array_merge(
+            $actual,
+            $values
+        ));
+    }
+
     /**
      * Return the parameter with the given name.
      *

tests/Unit/ContainerTest.php

@@ -130,6 +130,32 @@ public function testRegisterExtensionWithUserConfig()
         $this->assertEquals('bazz', $object->foobar);
     }
 
+    /**
+     * It should merge parameters.
+     */
+    public function testMergeParameters()
+    {
+        $this->container->setParameter('foo', [ 'foo' => 'bar' ]);
+        $this->container->mergeParameter('foo', [ 'bar' => 'boo' ]);
+        $this->assertEquals([
+            'foo' => 'bar',
+            'bar' => 'boo'
+        ], $this->container->getParameter('foo'));
+    }
+
+    /**
+     * It should throw an exception when trying to merge a value into a non-array parameter.
+     *
+     * @expectedException \InvalidArgumentException
+     * @expectedExceptionMessage scalar
+     */
+    public function testMergeParameterNonArray()
+    {
+        $this->container->setParameter('foo', 'bar');
+        $this->container->mergeParameter('foo', [ 'bar' => 'boo' ]);
+    }
+
+
     /**
      * It should throw an exception if an extension class does not exist.
      *