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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 <fabien@symfony.com> |
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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; |
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|
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use Symfony\Component\CssSelector\Parser\Shortcut\ClassParser; |
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use Symfony\Component\CssSelector\Parser\Shortcut\ElementParser; |
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use Symfony\Component\CssSelector\Parser\Shortcut\EmptyStringParser; |
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use Symfony\Component\CssSelector\Parser\Shortcut\HashParser; |
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use Symfony\Component\CssSelector\XPath\Extension\HtmlExtension; |
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use Symfony\Component\CssSelector\XPath\Translator; |
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|
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/** |
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* CssSelectorConverter is the main entry point of the component and can convert CSS |
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* selectors to XPath expressions. |
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* |
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* @author Christophe Coevoet <stof@notk.org> |
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*/ |
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class CssSelectorConverter |
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{ |
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public static int $maxCachedItems = 1024; |
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|
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private Translator $translator; |
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private array $cache; |
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|
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private static array $xmlCache = []; |
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private static array $htmlCache = []; |
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|
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/** |
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* @param bool $html Whether HTML support should be enabled. Disable it for XML documents |
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*/ |
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public function __construct(bool $html = true) |
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{ |
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$this->translator = new Translator(); |
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|
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if ($html) { |
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$this->translator->registerExtension(new HtmlExtension($this->translator)); |
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$this->cache = &self::$htmlCache; |
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} else { |
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$this->cache = &self::$xmlCache; |
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} |
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|
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$this->translator |
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->registerParserShortcut(new EmptyStringParser()) |
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->registerParserShortcut(new ElementParser()) |
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->registerParserShortcut(new ClassParser()) |
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->registerParserShortcut(new HashParser()) |
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; |
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} |
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|
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/** |
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* Translates a CSS expression to its XPath equivalent. |
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* |
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* Optionally, a prefix can be added to the resulting XPath |
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* expression with the $prefix parameter. |
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*/ |
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public function toXPath(string $cssExpr, string $prefix = 'descendant-or-self::'): string |
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{ |
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$cacheKey = $prefix."\0".$cssExpr; |
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|
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if (isset($this->cache[$cacheKey])) { |
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// Move the item last in cache (LRU) |
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$value = $this->cache[$cacheKey]; |
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unset($this->cache[$cacheKey]); |
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|
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return $this->cache[$cacheKey] = $value; |
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} |
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|
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if (\count($this->cache) >= self::$maxCachedItems) { |
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// Evict the oldest entry |
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unset($this->cache[array_key_first($this->cache)]); |
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} |
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|
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return $this->cache[$cacheKey] = $this->translator->cssToXPath($cssExpr, $prefix); |
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} |
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} |
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