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Directory >> /home/whitjouh/public_html/core/vendor/symfony/css-selector/XPath/Extension/

File / Folder	Size	Action
.	-
AbstractExtension.php	1.059KB	edt ren
AttributeMatchingExtens...	3.668KB	edt ren
CombinationExtension.php	1.827KB	edt ren
ExtensionInterface.php	1.505KB	edt ren
FunctionExtension.php	5.039KB	edt ren
HtmlExtension.php	5.672KB	edt ren
NodeExtension.php	5.688KB	edt ren
PseudoClassExtension.php	3.446KB	edt ren

<?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\Exception\SyntaxErrorException;
use Symfony\Component\CssSelector\Node\FunctionNode;
use Symfony\Component\CssSelector\Parser\Parser;
use Symfony\Component\CssSelector\XPath\Translator;
use Symfony\Component\CssSelector\XPath\XPathExpr;

/**
 * XPath expression translator function 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 FunctionExtension extends AbstractExtension
{
    public function getFunctionTranslators(): array
    {
        return [
            'nth-child' => $this->translateNthChild(...),
            'nth-last-child' => $this->translateNthLastChild(...),
            'nth-of-type' => $this->translateNthOfType(...),
            'nth-last-of-type' => $this->translateNthLastOfType(...),
            'contains' => $this->translateContains(...),
            'lang' => $this->translateLang(...),
        ];
    }

/**
     * @throws ExpressionErrorException
     */
    public function translateNthChild(XPathExpr $xpath, FunctionNode $function, bool $last = false, bool $addNameTest = true): XPathExpr
    {
        try {
            [$a, $b] = Parser::parseSeries($function->getArguments());
        } catch (SyntaxErrorException $e) {
            throw new ExpressionErrorException(sprintf('Invalid series: "%s".', implode('", "', $function->getArguments())), 0, $e);
        }

$xpath->addStarPrefix();
        if ($addNameTest) {
            $xpath->addNameTest();
        }

if (0 === $a) {
            return $xpath->addCondition('position() = '.($last ? 'last() - '.($b - 1) : $b));
        }

if ($a < 0) {
            if ($b < 1) {
                return $xpath->addCondition('false()');
            }

$sign = '<=';
        } else {
            $sign = '>=';
        }

$expr = 'position()';

if ($last) {
            $expr = 'last() - '.$expr;
            --$b;
        }

if (0 !== $b) {
            $expr .= ' - '.$b;
        }

$conditions = [sprintf('%s %s 0', $expr, $sign)];

if (1 !== $a && -1 !== $a) {
            $conditions[] = sprintf('(%s) mod %d = 0', $expr, $a);
        }

return $xpath->addCondition(implode(' and ', $conditions));

// todo: handle an+b, odd, even
        // an+b means every-a, plus b, e.g., 2n+1 means odd
        // 0n+b means b
        // n+0 means a=1, i.e., all elements
        // an means every a elements, i.e., 2n means even
        // -n means -1n
        // -1n+6 means elements 6 and previous
    }

public function translateNthLastChild(XPathExpr $xpath, FunctionNode $function): XPathExpr
    {
        return $this->translateNthChild($xpath, $function, true);
    }

public function translateNthOfType(XPathExpr $xpath, FunctionNode $function): XPathExpr
    {
        return $this->translateNthChild($xpath, $function, false, false);
    }

/**
     * @throws ExpressionErrorException
     */
    public function translateNthLastOfType(XPathExpr $xpath, FunctionNode $function): XPathExpr
    {
        if ('*' === $xpath->getElement()) {
            throw new ExpressionErrorException('"*:nth-of-type()" is not implemented.');
        }

return $this->translateNthChild($xpath, $function, true, false);
    }

/**
     * @throws ExpressionErrorException
     */
    public function translateContains(XPathExpr $xpath, FunctionNode $function): XPathExpr
    {
        $arguments = $function->getArguments();
        foreach ($arguments as $token) {
            if (!($token->isString() || $token->isIdentifier())) {
                throw new ExpressionErrorException('Expected a single string or identifier for :contains(), got '.implode(', ', $arguments));
            }
        }

return $xpath->addCondition(sprintf(
            'contains(string(.), %s)',
            Translator::getXpathLiteral($arguments[0]->getValue())
        ));
    }

/**
     * @throws ExpressionErrorException
     */
    public function translateLang(XPathExpr $xpath, FunctionNode $function): XPathExpr
    {
        $arguments = $function->getArguments();
        foreach ($arguments as $token) {
            if (!($token->isString() || $token->isIdentifier())) {
                throw new ExpressionErrorException('Expected a single string or identifier for :lang(), got '.implode(', ', $arguments));
            }
        }

return $xpath->addCondition(sprintf(
            'lang(%s)',
            Translator::getXpathLiteral($arguments[0]->getValue())
        ));
    }

public function getName(): string
    {
        return 'function';
    }
}