diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/Config/Definition/VariableNode.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/Config/Definition/VariableNode.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,115 @@
+<?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;
+use Symfony\Component\Config\Definition\Builder\NodeDefinition;
+
+/**
+ * This node represents a variable value in the config tree.
+ *
+ * This node is intended for arbitrary variables.
+ * Any PHP type is accepted as a value.
+ *
+ * @author Jeremy Mikola <jmikola@gmail.com>
+ */
+class VariableNode extends BaseNode implements PrototypeNodeInterface
+{
+    protected $defaultValueSet = false;
+    protected $defaultValue;
+    protected $allowEmptyValue = true;
+
+    /**
+     * {@inheritDoc}
+     */
+    public function setDefaultValue($value)
+    {
+        $this->defaultValueSet = true;
+        $this->defaultValue = $value;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function hasDefaultValue()
+    {
+        return $this->defaultValueSet;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getDefaultValue()
+    {
+        return $this->defaultValue instanceof \Closure ? call_user_func($this->defaultValue) : $this->defaultValue;
+    }
+
+    /**
+     * Sets if this node is allowed to have an empty value.
+     *
+     * @param Boolean $boolean True if this entity will accept empty values.
+     */
+    public function setAllowEmptyValue($boolean)
+    {
+        $this->allowEmptyValue = (Boolean) $boolean;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function setName($name)
+    {
+        $this->name = $name;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function validateType($value)
+    {
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function finalizeValue($value)
+    {
+        if (!$this->allowEmptyValue && empty($value)) {
+            $ex = new InvalidConfigurationException(sprintf(
+                'The path "%s" cannot contain an empty value, but got %s.',
+                $this->getPath(),
+                json_encode($value)
+            ));
+            $ex->setPath($this->getPath());
+
+            throw $ex;
+        }
+
+        return $value;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function normalizeValue($value)
+    {
+        return $value;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    protected function mergeValues($leftSide, $rightSide)
+    {
+        return $rightSide;
+    }
+}