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diff --git a/vendor/symfony/config/Definition/EnumNode.php b/vendor/symfony/config/Definition/EnumNode.php
new file mode 100644
index 000000000..9b4c4156e
--- /dev/null
+++ b/vendor/symfony/config/Definition/EnumNode.php
@@ -0,0 +1,58 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Config\Definition;
+
+use Symfony\Component\Config\Definition\Exception\InvalidConfigurationException;
+
+/**
+ * Node which only allows a finite set of values.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ */
+class EnumNode extends ScalarNode
+{
+    private $values;
+
+    public function __construct($name, NodeInterface $parent = null, array $values = array())
+    {
+        $values = array_unique($values);
+        if (empty($values)) {
+            throw new \InvalidArgumentException('$values must contain at least one element.');
+        }
+
+        parent::__construct($name, $parent);
+        $this->values = $values;
+    }
+
+    public function getValues()
+    {
+        return $this->values;
+    }
+
+    protected function finalizeValue($value)
+    {
+        $value = parent::finalizeValue($value);
+
+        if (!in_array($value, $this->values, true)) {
+            $ex = new InvalidConfigurationException(sprintf(
+                'The value %s is not allowed for path "%s". Permissible values: %s',
+                json_encode($value),
+                $this->getPath(),
+                implode(', ', array_map('json_encode', $this->values))));
+            $ex->setPath($this->getPath());
+
+            throw $ex;
+        }
+
+        return $value;
+    }
+}