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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 cssselector library, * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect. * * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com> */ 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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