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✏️ Editing: NodeExtension.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\Node;
use Symfony\Component\CssSelector\XPath\Translator;
use Symfony\Component\CssSelector\XPath\XPathExpr;

/**
 * XPath expression translator node 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 NodeExtension extends AbstractExtension
{
    const ELEMENT_NAME_IN_LOWER_CASE = 1;
    const ATTRIBUTE_NAME_IN_LOWER_CASE = 2;
    const ATTRIBUTE_VALUE_IN_LOWER_CASE = 4;

private $flags;

public function __construct(int $flags = 0)
    {
        $this->flags = $flags;
    }

/**
     * @return $this
     */
    public function setFlag(int $flag, bool $on): self
    {
        if ($on && !$this->hasFlag($flag)) {
            $this->flags += $flag;
        }

if (!$on && $this->hasFlag($flag)) {
            $this->flags -= $flag;
        }

return $this;
    }

public function hasFlag(int $flag): bool
    {
        return (bool) ($this->flags & $flag);
    }

/**
     * {@inheritdoc}
     */
    public function getNodeTranslators(): array
    {
        return [
            'Selector' => [$this, 'translateSelector'],
            'CombinedSelector' => [$this, 'translateCombinedSelector'],
            'Negation' => [$this, 'translateNegation'],
            'Function' => [$this, 'translateFunction'],
            'Pseudo' => [$this, 'translatePseudo'],
            'Attribute' => [$this, 'translateAttribute'],
            'Class' => [$this, 'translateClass'],
            'Hash' => [$this, 'translateHash'],
            'Element' => [$this, 'translateElement'],
        ];
    }

public function translateSelector(Node\SelectorNode $node, Translator $translator): XPathExpr
    {
        return $translator->nodeToXPath($node->getTree());
    }

public function translateCombinedSelector(Node\CombinedSelectorNode $node, Translator $translator): XPathExpr
    {
        return $translator->addCombination($node->getCombinator(), $node->getSelector(), $node->getSubSelector());
    }

public function translateNegation(Node\NegationNode $node, Translator $translator): XPathExpr
    {
        $xpath = $translator->nodeToXPath($node->getSelector());
        $subXpath = $translator->nodeToXPath($node->getSubSelector());
        $subXpath->addNameTest();

if ($subXpath->getCondition()) {
            return $xpath->addCondition(sprintf('not(%s)', $subXpath->getCondition()));
        }

return $xpath->addCondition('0');
    }

public function translateFunction(Node\FunctionNode $node, Translator $translator): XPathExpr
    {
        $xpath = $translator->nodeToXPath($node->getSelector());

return $translator->addFunction($xpath, $node);
    }

public function translatePseudo(Node\PseudoNode $node, Translator $translator): XPathExpr
    {
        $xpath = $translator->nodeToXPath($node->getSelector());

return $translator->addPseudoClass($xpath, $node->getIdentifier());
    }

public function translateAttribute(Node\AttributeNode $node, Translator $translator): XPathExpr
    {
        $name = $node->getAttribute();
        $safe = $this->isSafeName($name);

if ($this->hasFlag(self::ATTRIBUTE_NAME_IN_LOWER_CASE)) {
            $name = strtolower($name);
        }

if ($node->getNamespace()) {
            $name = sprintf('%s:%s', $node->getNamespace(), $name);
            $safe = $safe && $this->isSafeName($node->getNamespace());
        }

$attribute = $safe ? '@'.$name : sprintf('attribute::*[name() = %s]', Translator::getXpathLiteral($name));
        $value = $node->getValue();
        $xpath = $translator->nodeToXPath($node->getSelector());

if ($this->hasFlag(self::ATTRIBUTE_VALUE_IN_LOWER_CASE)) {
            $value = strtolower($value);
        }

return $translator->addAttributeMatching($xpath, $node->getOperator(), $attribute, $value);
    }

public function translateClass(Node\ClassNode $node, Translator $translator): XPathExpr
    {
        $xpath = $translator->nodeToXPath($node->getSelector());

return $translator->addAttributeMatching($xpath, '~=', '@class', $node->getName());
    }

public function translateHash(Node\HashNode $node, Translator $translator): XPathExpr
    {
        $xpath = $translator->nodeToXPath($node->getSelector());

return $translator->addAttributeMatching($xpath, '=', '@id', $node->getId());
    }

public function translateElement(Node\ElementNode $node): XPathExpr
    {
        $element = $node->getElement();

if ($this->hasFlag(self::ELEMENT_NAME_IN_LOWER_CASE)) {
            $element = strtolower($element);
        }

if ($element) {
            $safe = $this->isSafeName($element);
        } else {
            $element = '*';
            $safe = true;
        }

if ($node->getNamespace()) {
            $element = sprintf('%s:%s', $node->getNamespace(), $element);
            $safe = $safe && $this->isSafeName($node->getNamespace());
        }

$xpath = new XPathExpr('', $element);

if (!$safe) {
            $xpath->addNameTest();
        }

return $xpath;
    }

/**
     * {@inheritdoc}
     */
    public function getName(): string
    {
        return 'node';
    }

private function isSafeName(string $name): bool
    {
        return 0 < preg_match('~^[a-zA-Z_][a-zA-Z0-9_.-]*$~', $name);
    }
}

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