diff -r 000000000000 -r 7f95f8617b0b vendor/symfony/src/Symfony/Component/Config/Definition/Builder/ExprBuilder.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/symfony/src/Symfony/Component/Config/Definition/Builder/ExprBuilder.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,226 @@
+<?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;
+use Symfony\Component\Config\Definition\Exception\UnsetKeyException;
+
+/**
+ * This class builds an if expression.
+ *
+ * @author Johannes M. Schmitt <schmittjoh@gmail.com>
+ * @author Christophe Coevoet <stof@notk.org>
+ */
+class ExprBuilder
+{
+    protected $node;
+    public $ifPart;
+    public $thenPart;
+
+    /**
+     * Constructor
+     *
+     * @param NodeDefinition $node The related node
+     */
+    public function __construct(NodeDefinition $node)
+    {
+        $this->node = $node;
+    }
+
+    /**
+     * Mark the expression as being always used.
+     *
+     * @return ExprBuilder
+     */
+    public function always(\Closure $then = null)
+    {
+        $this->ifPart = function($v) { return true; };
+
+        if (null !== $then) {
+            $this->thenPart = $then;
+        }
+
+        return $this;
+    }
+
+    /**
+     * Sets a closure to use as tests.
+     *
+     * The default one tests if the value is true.
+     *
+     * @param \Closure $closure
+     * @return ExprBuilder
+     */
+    public function ifTrue(\Closure $closure = null)
+    {
+        if (null === $closure) {
+            $closure = function($v) { return true === $v; };
+        }
+
+        $this->ifPart = $closure;
+
+        return $this;
+    }
+
+    /**
+     * Tests if the value is a string.
+     *
+     * @return ExprBuilder
+     */
+    public function ifString()
+    {
+        $this->ifPart = function($v) { return is_string($v); };
+
+        return $this;
+    }
+
+    /**
+     * Tests if the value is null.
+     *
+     * @return ExprBuilder
+     */
+    public function ifNull()
+    {
+        $this->ifPart = function($v) { return null === $v; };
+
+        return $this;
+    }
+
+    /**
+     * Tests if the value is an array.
+     *
+     * @return ExprBuilder
+     */
+    public function ifArray()
+    {
+        $this->ifPart = function($v) { return is_array($v); };
+
+        return $this;
+    }
+
+    /**
+     * Tests if the value is in an array.
+     *
+     * @param array $array
+     *
+     * @return ExprBuilder
+     */
+    public function ifInArray(array $array)
+    {
+        $this->ifPart = function($v) use ($array) { return in_array($v, $array, true); };
+
+        return $this;
+    }
+
+    /**
+     * Tests if the value is not in an array.
+     *
+     * @param array $array
+     *
+     * @return ExprBuilder
+     */
+    public function ifNotInArray(array $array)
+    {
+        $this->ifPart = function($v) use ($array) { return !in_array($v, $array, true); };
+
+        return $this;
+    }
+
+    /**
+     * Sets the closure to run if the test pass.
+     *
+     * @param \Closure $closure
+     *
+     * @return ExprBuilder
+     */
+    public function then(\Closure $closure)
+    {
+        $this->thenPart = $closure;
+
+        return $this;
+    }
+
+    /**
+     * Sets a closure returning an empty array.
+     *
+     * @return ExprBuilder
+     */
+    public function thenEmptyArray()
+    {
+        $this->thenPart = function($v) { return array(); };
+
+        return $this;
+    }
+
+    /**
+     * Sets a closure marking the value as invalid at validation time.
+     *
+     * if you want to add the value of the node in your message just use a %s placeholder.
+     *
+     * @param string $message
+     *
+     * @return ExprBuilder
+     */
+    public function thenInvalid($message)
+    {
+        $this->thenPart = function ($v) use ($message) {throw new \InvalidArgumentException(sprintf($message, json_encode($v))); };
+
+        return $this;
+    }
+
+    /**
+     * Sets a closure unsetting this key of the array at validation time.
+     *
+     * @return ExprBuilder
+     */
+    public function thenUnset()
+    {
+        $this->thenPart = function ($v) { throw new UnsetKeyException('Unsetting key'); };
+
+        return $this;
+    }
+
+    /**
+     * Returns the related node
+     *
+     * @return NodeDefinition
+     */
+    public function end()
+    {
+        if (null === $this->ifPart) {
+            throw new \RuntimeException('You must specify an if part.');
+        }
+        if (null === $this->thenPart) {
+            throw new \RuntimeException('You must specify a then part.');
+        }
+
+        return $this->node;
+    }
+
+    /**
+     * Builds the expressions.
+     *
+     * @param array $expressions An array of ExprBuilder instances to build
+     *
+     * @return array
+     */
+    static public function buildExpressions(array $expressions)
+    {
+        foreach ($expressions as $k => $expr) {
+            if ($expr instanceof ExprBuilder) {
+                $expressions[$k] = function($v) use($expr) {
+                    return call_user_func($expr->ifPart, $v) ? call_user_func($expr->thenPart, $v) : $v;
+                };
+            }
+        }
+
+        return $expressions;
+    }
+}