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