Chris@0: <?php
Chris@0: 
Chris@0: /*
Chris@0:  * This file is part of the Symfony package.
Chris@0:  *
Chris@0:  * (c) Fabien Potencier <fabien@symfony.com>
Chris@0:  *
Chris@0:  * For the full copyright and license information, please view the LICENSE
Chris@0:  * file that was distributed with this source code.
Chris@0:  */
Chris@0: 
Chris@0: namespace Symfony\Component\CssSelector\XPath\Extension;
Chris@0: 
Chris@0: use Symfony\Component\CssSelector\Exception\ExpressionErrorException;
Chris@0: use Symfony\Component\CssSelector\XPath\XPathExpr;
Chris@0: 
Chris@0: /**
Chris@0:  * XPath expression translator pseudo-class extension.
Chris@0:  *
Chris@0:  * This component is a port of the Python cssselect library,
Chris@0:  * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
Chris@0:  *
Chris@0:  * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
Chris@0:  *
Chris@0:  * @internal
Chris@0:  */
Chris@0: class PseudoClassExtension extends AbstractExtension
Chris@0: {
Chris@0:     /**
Chris@0:      * {@inheritdoc}
Chris@0:      */
Chris@0:     public function getPseudoClassTranslators()
Chris@0:     {
Chris@17:         return [
Chris@17:             'root' => [$this, 'translateRoot'],
Chris@17:             'first-child' => [$this, 'translateFirstChild'],
Chris@17:             'last-child' => [$this, 'translateLastChild'],
Chris@17:             'first-of-type' => [$this, 'translateFirstOfType'],
Chris@17:             'last-of-type' => [$this, 'translateLastOfType'],
Chris@17:             'only-child' => [$this, 'translateOnlyChild'],
Chris@17:             'only-of-type' => [$this, 'translateOnlyOfType'],
Chris@17:             'empty' => [$this, 'translateEmpty'],
Chris@17:         ];
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return XPathExpr
Chris@0:      */
Chris@0:     public function translateRoot(XPathExpr $xpath)
Chris@0:     {
Chris@0:         return $xpath->addCondition('not(parent::*)');
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return XPathExpr
Chris@0:      */
Chris@0:     public function translateFirstChild(XPathExpr $xpath)
Chris@0:     {
Chris@0:         return $xpath
Chris@0:             ->addStarPrefix()
Chris@0:             ->addNameTest()
Chris@0:             ->addCondition('position() = 1');
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return XPathExpr
Chris@0:      */
Chris@0:     public function translateLastChild(XPathExpr $xpath)
Chris@0:     {
Chris@0:         return $xpath
Chris@0:             ->addStarPrefix()
Chris@0:             ->addNameTest()
Chris@0:             ->addCondition('position() = last()');
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return XPathExpr
Chris@0:      *
Chris@0:      * @throws ExpressionErrorException
Chris@0:      */
Chris@0:     public function translateFirstOfType(XPathExpr $xpath)
Chris@0:     {
Chris@0:         if ('*' === $xpath->getElement()) {
Chris@0:             throw new ExpressionErrorException('"*:first-of-type" is not implemented.');
Chris@0:         }
Chris@0: 
Chris@0:         return $xpath
Chris@0:             ->addStarPrefix()
Chris@0:             ->addCondition('position() = 1');
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return XPathExpr
Chris@0:      *
Chris@0:      * @throws ExpressionErrorException
Chris@0:      */
Chris@0:     public function translateLastOfType(XPathExpr $xpath)
Chris@0:     {
Chris@0:         if ('*' === $xpath->getElement()) {
Chris@0:             throw new ExpressionErrorException('"*:last-of-type" is not implemented.');
Chris@0:         }
Chris@0: 
Chris@0:         return $xpath
Chris@0:             ->addStarPrefix()
Chris@0:             ->addCondition('position() = last()');
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return XPathExpr
Chris@0:      */
Chris@0:     public function translateOnlyChild(XPathExpr $xpath)
Chris@0:     {
Chris@0:         return $xpath
Chris@0:             ->addStarPrefix()
Chris@0:             ->addNameTest()
Chris@0:             ->addCondition('last() = 1');
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return XPathExpr
Chris@0:      *
Chris@0:      * @throws ExpressionErrorException
Chris@0:      */
Chris@0:     public function translateOnlyOfType(XPathExpr $xpath)
Chris@0:     {
Chris@0:         if ('*' === $xpath->getElement()) {
Chris@0:             throw new ExpressionErrorException('"*:only-of-type" is not implemented.');
Chris@0:         }
Chris@0: 
Chris@0:         return $xpath->addCondition('last() = 1');
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * @return XPathExpr
Chris@0:      */
Chris@0:     public function translateEmpty(XPathExpr $xpath)
Chris@0:     {
Chris@0:         return $xpath->addCondition('not(*) and not(string-length())');
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * {@inheritdoc}
Chris@0:      */
Chris@0:     public function getName()
Chris@0:     {
Chris@0:         return 'pseudo-class';
Chris@0:     }
Chris@0: }