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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\Parser; |
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|
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/** |
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* CSS selector reader. |
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* |
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* This component is a port of the Python cssselect library, |
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* which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect. |
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* |
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* @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com> |
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* |
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* @internal |
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*/ |
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class Reader |
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{ |
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private static array $anchoredPatterns = []; |
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|
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private int $length; |
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private int $position = 0; |
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|
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public function __construct( |
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private string $source, |
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) { |
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$this->length = \strlen($source); |
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} |
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|
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public function isEOF(): bool |
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{ |
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return $this->position >= $this->length; |
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} |
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|
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public function getPosition(): int |
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{ |
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return $this->position; |
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} |
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|
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public function getRemainingLength(): int |
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{ |
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return $this->length - $this->position; |
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} |
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|
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public function getSubstring(int $length, int $offset = 0): string |
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{ |
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return substr($this->source, $this->position + $offset, $length); |
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} |
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|
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public function getOffset(string $string): int|false |
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{ |
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$position = strpos($this->source, $string, $this->position); |
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|
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return false === $position ? false : $position - $this->position; |
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} |
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|
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public function findPattern(string $pattern): array|false |
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{ |
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// Match in place instead of copying the remaining source before every probe. |
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// Combined with an offset, "^" still anchors at the start of the whole subject, |
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// so a leading anchor is turned into "\\G", which anchors at the offset instead. |
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$pattern = self::$anchoredPatterns[$pattern] ??= '^' === ($pattern[1] ?? '') ? $pattern[0].'\\G'.substr($pattern, 2) : $pattern; |
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|
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if (preg_match($pattern, $this->source, $matches, 0, $this->position)) { |
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return $matches; |
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} |
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|
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return false; |
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} |
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|
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public function moveForward(int $length): void |
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{ |
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$this->position += $length; |
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} |
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|
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public function moveToEnd(): void |
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{ |
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$this->position = $this->length; |
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} |
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} |
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|
