diff -r 000000000000 -r 7f95f8617b0b vendor/doctrine/lib/Doctrine/ORM/Query/Expr/Math.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/doctrine/lib/Doctrine/ORM/Query/Expr/Math.php	Sat Sep 24 15:40:41 2011 +0200
@@ -0,0 +1,66 @@
+<?php
+/*
+ *  $Id$
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the LGPL. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\ORM\Query\Expr;
+
+/**
+ * Expression class for DQL math statements
+ *
+ * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
+ * @link    www.doctrine-project.org
+ * @since   2.0
+ * @version $Revision$
+ * @author  Guilherme Blanco <guilhermeblanco@hotmail.com>
+ * @author  Jonathan Wage <jonwage@gmail.com>
+ * @author  Roman Borschel <roman@code-factory.org>
+ */
+class Math
+{
+    private $_leftExpr;
+    private $_operator;
+    private $_rightExpr;
+
+    public function __construct($leftExpr, $operator, $rightExpr)
+    {
+        $this->_leftExpr  = $leftExpr;
+        $this->_operator  = $operator;
+        $this->_rightExpr = $rightExpr;
+    }
+
+    public function __toString()
+    {
+        // Adjusting Left Expression
+        $leftExpr = (string) $this->_leftExpr;
+        
+        if ($this->_leftExpr instanceof Math) {
+            $leftExpr = '(' . $leftExpr . ')';
+        }
+        
+        // Adjusting Right Expression
+        $rightExpr = (string) $this->_rightExpr;
+        
+        if ($this->_rightExpr instanceof Math) {
+            $rightExpr = '(' . $rightExpr . ')';
+        }
+    
+        return $leftExpr . ' ' . $this->_operator . ' ' . $rightExpr;
+    }
+}
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