TokenizerEscaping.php
66 lines
| 1 | <?php |
| 2 | |
| 3 | /* |
| 4 | * This file is part of the Symfony package. |
| 5 | * |
| 6 | * (c) Fabien Potencier <fabien@symfony.com> |
| 7 | * |
| 8 | * For the full copyright and license information, please view the LICENSE |
| 9 | * file that was distributed with this source code. |
| 10 | */ |
| 11 | |
| 12 | namespace Symfony\Component\CssSelector\Parser\Tokenizer; |
| 13 | |
| 14 | /** |
| 15 | * CSS selector tokenizer escaping applier. |
| 16 | * |
| 17 | * This component is a port of the Python cssselect library, |
| 18 | * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect. |
| 19 | * |
| 20 | * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com> |
| 21 | * |
| 22 | * @internal |
| 23 | */ |
| 24 | class TokenizerEscaping |
| 25 | { |
| 26 | private $patterns; |
| 27 | |
| 28 | public function __construct(TokenizerPatterns $patterns) |
| 29 | { |
| 30 | $this->patterns = $patterns; |
| 31 | } |
| 32 | |
| 33 | public function escapeUnicode(string $value): string |
| 34 | { |
| 35 | $value = $this->replaceUnicodeSequences($value); |
| 36 | |
| 37 | return preg_replace($this->patterns->getSimpleEscapePattern(), '$1', $value); |
| 38 | } |
| 39 | |
| 40 | public function escapeUnicodeAndNewLine(string $value): string |
| 41 | { |
| 42 | $value = preg_replace($this->patterns->getNewLineEscapePattern(), '', $value); |
| 43 | |
| 44 | return $this->escapeUnicode($value); |
| 45 | } |
| 46 | |
| 47 | private function replaceUnicodeSequences(string $value): string |
| 48 | { |
| 49 | return preg_replace_callback($this->patterns->getUnicodeEscapePattern(), function ($match) { |
| 50 | $c = hexdec($match[1]); |
| 51 | |
| 52 | if (0x80 > $c %= 0x200000) { |
| 53 | return \chr($c); |
| 54 | } |
| 55 | if (0x800 > $c) { |
| 56 | return \chr(0xC0 | $c >> 6).\chr(0x80 | $c & 0x3F); |
| 57 | } |
| 58 | if (0x10000 > $c) { |
| 59 | return \chr(0xE0 | $c >> 12).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F); |
| 60 | } |
| 61 | |
| 62 | return ''; |
| 63 | }, $value); |
| 64 | } |
| 65 | } |
| 66 |