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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';
- }
- }
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