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vendor/symfony/css-selector/XPath/Extension/PseudoClassExtension.php

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+<?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\Exception\ExpressionErrorException;
+use Symfony\Component\CssSelector\XPath\XPathExpr;
+
+/**
+ * XPath expression translator pseudo-class 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 PseudoClassExtension extends AbstractExtension
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getPseudoClassTranslators()
+    {
+        return array(
+            'root' => array($this, 'translateRoot'),
+            'first-child' => array($this, 'translateFirstChild'),
+            'last-child' => array($this, 'translateLastChild'),
+            'first-of-type' => array($this, 'translateFirstOfType'),
+            'last-of-type' => array($this, 'translateLastOfType'),
+            'only-child' => array($this, 'translateOnlyChild'),
+            'only-of-type' => array($this, 'translateOnlyOfType'),
+            'empty' => array($this, 'translateEmpty'),
+        );
+    }
+
+    /**
+     * @param XPathExpr $xpath
+     *
+     * @return XPathExpr
+     */
+    public function translateRoot(XPathExpr $xpath)
+    {
+        return $xpath->addCondition('not(parent::*)');
+    }
+
+    /**
+     * @param XPathExpr $xpath
+     *
+     * @return XPathExpr
+     */
+    public function translateFirstChild(XPathExpr $xpath)
+    {
+        return $xpath
+            ->addStarPrefix()
+            ->addNameTest()
+            ->addCondition('position() = 1');
+    }
+
+    /**
+     * @param XPathExpr $xpath
+     *
+     * @return XPathExpr
+     */
+    public function translateLastChild(XPathExpr $xpath)
+    {
+        return $xpath
+            ->addStarPrefix()
+            ->addNameTest()
+            ->addCondition('position() = last()');
+    }
+
+    /**
+     * @param XPathExpr $xpath
+     *
+     * @return XPathExpr
+     *
+     * @throws ExpressionErrorException
+     */
+    public function translateFirstOfType(XPathExpr $xpath)
+    {
+        if ('*' === $xpath->getElement()) {
+            throw new ExpressionErrorException('"*:first-of-type" is not implemented.');
+        }
+
+        return $xpath
+            ->addStarPrefix()
+            ->addCondition('position() = 1');
+    }
+
+    /**
+     * @param XPathExpr $xpath
+     *
+     * @return XPathExpr
+     *
+     * @throws ExpressionErrorException
+     */
+    public function translateLastOfType(XPathExpr $xpath)
+    {
+        if ('*' === $xpath->getElement()) {
+            throw new ExpressionErrorException('"*:last-of-type" is not implemented.');
+        }
+
+        return $xpath
+            ->addStarPrefix()
+            ->addCondition('position() = last()');
+    }
+
+    /**
+     * @param XPathExpr $xpath
+     *
+     * @return XPathExpr
+     */
+    public function translateOnlyChild(XPathExpr $xpath)
+    {
+        return $xpath
+            ->addStarPrefix()
+            ->addNameTest()
+            ->addCondition('last() = 1');
+    }
+
+    /**
+     * @param XPathExpr $xpath
+     *
+     * @return XPathExpr
+     *
+     * @throws ExpressionErrorException
+     */
+    public function translateOnlyOfType(XPathExpr $xpath)
+    {
+        if ('*' === $xpath->getElement()) {
+            throw new ExpressionErrorException('"*:only-of-type" is not implemented.');
+        }
+
+        return $xpath->addCondition('last() = 1');
+    }
+
+    /**
+     * @param XPathExpr $xpath
+     *
+     * @return XPathExpr
+     */
+    public function translateEmpty(XPathExpr $xpath)
+    {
+        return $xpath->addCondition('not(*) and not(string-length())');
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getName()
+    {
+        return 'pseudo-class';
+    }
+}