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<?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
{
public const ELEMENT_NAME_IN_LOWER_CASE = 1;
public const ATTRIBUTE_NAME_IN_LOWER_CASE = 2;
public const ATTRIBUTE_VALUE_IN_LOWER_CASE = 4;
public function __construct(
private int $flags = 0,
) {
}
/**
* @return $this
*/
public function setFlag(int $flag, bool $on): static
{
if ($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);
}
public function getNodeTranslators(): array
{
return [
'Selector' => $this->translateSelector(...),
'CombinedSelector' => $this->translateCombinedSelector(...),
'Negation' => $this->translateNegation(...),
'Matching' => $this->translateMatching(...),
'SpecificityAdjustment' => $this->translateSpecificityAdjustment(...),
'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 translateMatching(Node\MatchingNode $node, Translator $translator): XPathExpr
{
$xpath = $translator->nodeToXPath($node->selector);
foreach ($node->arguments as $argument) {
$expr = $translator->nodeToXPath($argument);
$expr->addNameTest();
if ($condition = $expr->getCondition()) {
$xpath->addCondition($condition, 'or');
}
}
return $xpath;
}
public function translateSpecificityAdjustment(Node\SpecificityAdjustmentNode $node, Translator $translator): XPathExpr
{
$xpath = $translator->nodeToXPath($node->selector);
foreach ($node->arguments as $argument) {
$expr = $translator->nodeToXPath($argument);
$expr->addNameTest();
if ($condition = $expr->getCondition()) {
$xpath->addCondition($condition, 'or');
}
}
return $xpath;
}
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 = $node->getElement();
if ($element && $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;
}
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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