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<?php |
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|
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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 <[email protected]> |
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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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|
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namespace Symfony\Component\CssSelector\XPath\Extension; |
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|
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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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/** |
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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 <[email protected]> |
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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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/** |
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* {@inheritdoc} |
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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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|
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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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|
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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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|
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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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/** |
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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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|
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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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/** |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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/** |
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* {@inheritdoc} |
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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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|
