117 lines
3.3 KiB
PHP
117 lines
3.3 KiB
PHP
<?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
|
|
{
|
|
public function getPseudoClassTranslators(): array
|
|
{
|
|
return [
|
|
'root' => $this->translateRoot(...),
|
|
'first-child' => $this->translateFirstChild(...),
|
|
'last-child' => $this->translateLastChild(...),
|
|
'first-of-type' => $this->translateFirstOfType(...),
|
|
'last-of-type' => $this->translateLastOfType(...),
|
|
'only-child' => $this->translateOnlyChild(...),
|
|
'only-of-type' => $this->translateOnlyOfType(...),
|
|
'empty' => $this->translateEmpty(...),
|
|
];
|
|
}
|
|
|
|
public function translateRoot(XPathExpr $xpath): XPathExpr
|
|
{
|
|
return $xpath->addCondition('not(parent::*)');
|
|
}
|
|
|
|
public function translateFirstChild(XPathExpr $xpath): XPathExpr
|
|
{
|
|
return $xpath
|
|
->addStarPrefix()
|
|
->addNameTest()
|
|
->addCondition('position() = 1');
|
|
}
|
|
|
|
public function translateLastChild(XPathExpr $xpath): XPathExpr
|
|
{
|
|
return $xpath
|
|
->addStarPrefix()
|
|
->addNameTest()
|
|
->addCondition('position() = last()');
|
|
}
|
|
|
|
/**
|
|
* @throws ExpressionErrorException
|
|
*/
|
|
public function translateFirstOfType(XPathExpr $xpath): XPathExpr
|
|
{
|
|
if ('*' === $xpath->getElement()) {
|
|
throw new ExpressionErrorException('"*:first-of-type" is not implemented.');
|
|
}
|
|
|
|
return $xpath
|
|
->addStarPrefix()
|
|
->addCondition('position() = 1');
|
|
}
|
|
|
|
/**
|
|
* @throws ExpressionErrorException
|
|
*/
|
|
public function translateLastOfType(XPathExpr $xpath): XPathExpr
|
|
{
|
|
if ('*' === $xpath->getElement()) {
|
|
throw new ExpressionErrorException('"*:last-of-type" is not implemented.');
|
|
}
|
|
|
|
return $xpath
|
|
->addStarPrefix()
|
|
->addCondition('position() = last()');
|
|
}
|
|
|
|
public function translateOnlyChild(XPathExpr $xpath): XPathExpr
|
|
{
|
|
return $xpath
|
|
->addStarPrefix()
|
|
->addNameTest()
|
|
->addCondition('last() = 1');
|
|
}
|
|
|
|
public function translateOnlyOfType(XPathExpr $xpath): XPathExpr
|
|
{
|
|
$element = $xpath->getElement();
|
|
|
|
return $xpath->addCondition(sprintf('count(preceding-sibling::%s)=0 and count(following-sibling::%s)=0', $element, $element));
|
|
}
|
|
|
|
public function translateEmpty(XPathExpr $xpath): XPathExpr
|
|
{
|
|
return $xpath->addCondition('not(*) and not(string-length())');
|
|
}
|
|
|
|
public function getName(): string
|
|
{
|
|
return 'pseudo-class';
|
|
}
|
|
}
|