| /vendor/symfony/css-selector/XPath/Extension/PseudoClassExtension.php |
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| @@ -0,0 +1,164 @@ |
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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'; |
| } |
| } |
