--- /dev/null
+<?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\Builder;
+
+/**
+ * This class builds validation conditions.
+ *
+ * @author Christophe Coevoet <stof@notk.org>
+ */
+class ValidationBuilder
+{
+ protected $node;
+ public $rules = array();
+
+ /**
+ * Constructor.
+ *
+ * @param NodeDefinition $node The related node
+ */
+ public function __construct(NodeDefinition $node)
+ {
+ $this->node = $node;
+ }
+
+ /**
+ * Registers a closure to run as normalization or an expression builder to build it if null is provided.
+ *
+ * @param \Closure $closure
+ *
+ * @return ExprBuilder|$this
+ */
+ public function rule(\Closure $closure = null)
+ {
+ if (null !== $closure) {
+ $this->rules[] = $closure;
+
+ return $this;
+ }
+
+ return $this->rules[] = new ExprBuilder($this->node);
+ }
+}