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Edit File : Unescaper.php \| Size : 3.05 KB
<?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); } } Back

Edit File : Unescaper.php | Size : 3.05 KB

<?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);
    }
}

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