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Filename : Unescaper.php

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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\Yaml;

use Symfony\Component\Yaml\Exception\ParseException;

/**
 * Unescaper encapsulates unescaping rules for single and double-quoted
 * YAML strings.
 *
 * @author Matthew Lewinski <matthew@lewinski.org>
 *
 * @internal
 */
class Unescaper
{
    /**
     * Regex fragment that matches an escaped character in a double quoted string.
     */
    public const REGEX_ESCAPED_CHARACTER = '\\\\(x[0-9a-fA-F]{2}|u[0-9a-fA-F]{4}|U[0-9a-fA-F]{8}|.)';

    /**
     * Unescapes a single quoted string.
     *
     * @param string $value A single quoted string
     */
    public function unescapeSingleQuotedString(string $value): string
    {
        return str_replace('\'\'', '\'', $value);
    }

    /**
     * Unescapes a double quoted string.
     *
     * @param string $value A double quoted string
     */
    public function unescapeDoubleQuotedString(string $value): string
    {
        $callback = fn ($match) => $this->unescapeCharacter($match[0]);

        // evaluate the string
        return preg_replace_callback('/'.self::REGEX_ESCAPED_CHARACTER.'/u', $callback, $value);
    }

    /**
     * Unescapes a character that was found in a double-quoted string.
     *
     * @param string $value An escaped character
     */
    private function unescapeCharacter(string $value): string
    {
        return match ($value[1]) {
            '0' => "\x0",
            'a' => "\x7",
            'b' => "\x8",
            't' => "\t",
            "\t" => "\t",
            'n' => "\n",
            'v' => "\xB",
            'f' => "\xC",
            'r' => "\r",
            'e' => "\x1B",
            ' ' => ' ',
            '"' => '"',
            '/' => '/',
            '\\' => '\\',
            // U+0085 NEXT LINE
            'N' => "\xC2\x85",
            // U+00A0 NO-BREAK SPACE
            '_' => "\xC2\xA0",
            // U+2028 LINE SEPARATOR
            'L' => "\xE2\x80\xA8",
            // U+2029 PARAGRAPH SEPARATOR
            'P' => "\xE2\x80\xA9",
            'x' => self::utf8chr(hexdec(substr($value, 2, 2))),
            'u' => self::utf8chr(hexdec(substr($value, 2, 4))),
            'U' => self::utf8chr(hexdec(substr($value, 2, 8))),
            default => throw new ParseException(sprintf('Found unknown escape character "%s".', $value)),
        };
    }

    /**
     * Get the UTF-8 character for the given code point.
     */
    private static function utf8chr(int $c): string
    {
        if (0x80 > $c %= 0x200000) {
            return \chr($c);
        }
        if (0x800 > $c) {
            return \chr(0xC0 | $c >> 6).\chr(0x80 | $c & 0x3F);
        }
        if (0x10000 > $c) {
            return \chr(0xE0 | $c >> 12).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F);
        }

        return \chr(0xF0 | $c >> 18).\chr(0x80 | $c >> 12 & 0x3F).\chr(0x80 | $c >> 6 & 0x3F).\chr(0x80 | $c & 0x3F);
    }
}

Name	Size	Last Modified	Owner	Permissions
Command	Dir	September 21 2023 12:13:25	alamhospitals	0755
Exception	Dir	September 21 2023 12:13:25	alamhospitals	0755
Resources	Dir	September 21 2023 12:13:25	alamhospitals	0755
Tag	Dir	September 21 2023 12:13:25	alamhospitals	0755
CHANGELOG.md	7.203 KB	July 30 2023 6:38:24	alamhospitals	0644
composer.json	0.909 KB	July 30 2023 6:38:24	alamhospitals	0644
Dumper.php	7.052 KB	July 30 2023 6:38:24	alamhospitals	0644
Escaper.php	3.741 KB	July 30 2023 6:38:24	alamhospitals	0644
Inline.php	34.258 KB	July 30 2023 6:38:24	alamhospitals	0644
LICENSE	1.043 KB	July 30 2023 6:38:24	alamhospitals	0644
Parser.php	48.936 KB	July 30 2023 6:38:24	alamhospitals	0644
README.md	0.441 KB	July 30 2023 6:38:24	alamhospitals	0644
Unescaper.php	3.051 KB	July 30 2023 6:38:24	alamhospitals	0644
Yaml.php	2.876 KB	July 30 2023 6:38:24	alamhospitals	0644

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