--- /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\CssSelector\XPath\Extension;
+
+use Symfony\Component\CssSelector\XPath\XPathExpr;
+
+/**
+ * XPath expression translator combination extension.
+ *
+ * This component is a port of the Python cssselect library,
+ * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
+ *
+ * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
+ *
+ * @internal
+ */
+class CombinationExtension extends AbstractExtension
+{
+ /**
+ * {@inheritdoc}
+ */
+ public function getCombinationTranslators()
+ {
+ return array(
+ ' ' => array($this, 'translateDescendant'),
+ '>' => array($this, 'translateChild'),
+ '+' => array($this, 'translateDirectAdjacent'),
+ '~' => array($this, 'translateIndirectAdjacent'),
+ );
+ }
+
+ /**
+ * @param XPathExpr $xpath
+ * @param XPathExpr $combinedXpath
+ *
+ * @return XPathExpr
+ */
+ public function translateDescendant(XPathExpr $xpath, XPathExpr $combinedXpath)
+ {
+ return $xpath->join('/descendant-or-self::*/', $combinedXpath);
+ }
+
+ /**
+ * @param XPathExpr $xpath
+ * @param XPathExpr $combinedXpath
+ *
+ * @return XPathExpr
+ */
+ public function translateChild(XPathExpr $xpath, XPathExpr $combinedXpath)
+ {
+ return $xpath->join('/', $combinedXpath);
+ }
+
+ /**
+ * @param XPathExpr $xpath
+ * @param XPathExpr $combinedXpath
+ *
+ * @return XPathExpr
+ */
+ public function translateDirectAdjacent(XPathExpr $xpath, XPathExpr $combinedXpath)
+ {
+ return $xpath
+ ->join('/following-sibling::', $combinedXpath)
+ ->addNameTest()
+ ->addCondition('position() = 1');
+ }
+
+ /**
+ * @param XPathExpr $xpath
+ * @param XPathExpr $combinedXpath
+ *
+ * @return XPathExpr
+ */
+ public function translateIndirectAdjacent(XPathExpr $xpath, XPathExpr $combinedXpath)
+ {
+ return $xpath->join('/following-sibling::', $combinedXpath);
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getName()
+ {
+ return 'combination';
+ }
+}