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File Name : StringUnescaper.php

<?php declare(strict_types = 1);

namespace PHPStan\PhpDocParser\Parser;

use PHPStan\ShouldNotHappenException;
use function chr;
use function hexdec;
use function octdec;
use function preg_replace_callback;
use function str_replace;
use function substr;

class StringUnescaper
{

private const REPLACEMENTS = [
		'\\' => '\\',
		'n' => "\n",
		'r' => "\r",
		't' => "\t",
		'f' => "\f",
		'v' => "\v",
		'e' => "\x1B",
	];

public static function unescapeString(string $string): string
	{
		$quote = $string[0];

if ($quote === '\'') {
			return str_replace(
				['\\\\', '\\\''],
				['\\', '\''],
				substr($string, 1, -1),
			);
		}

return self::parseEscapeSequences(substr($string, 1, -1), '"');
	}

/**
	 * Implementation based on https://github.com/nikic/PHP-Parser/blob/b0edd4c41111042d43bb45c6c657b2e0db367d9e/lib/PhpParser/Node/Scalar/String_.php#L90-L130
	 */
	private static function parseEscapeSequences(string $str, string $quote): string
	{
		$str = str_replace('\\' . $quote, $quote, $str);

return preg_replace_callback(
			'~\\\\([\\\\nrtfve]|[xX][0-9a-fA-F]{1,2}|[0-7]{1,3}|u\{([0-9a-fA-F]+)\})~',
			static function ($matches) {
				$str = $matches[1];

if (isset(self::REPLACEMENTS[$str])) {
					return self::REPLACEMENTS[$str];
				}
				if ($str[0] === 'x' || $str[0] === 'X') {
					return chr((int) hexdec(substr($str, 1)));
				}
				if ($str[0] === 'u') {
					if (!isset($matches[2])) {
						throw new ShouldNotHappenException();
					}
					return self::codePointToUtf8((int) hexdec($matches[2]));
				}

return chr((int) octdec($str));
			},
			$str,
		);
	}

/**
	 * Implementation based on https://github.com/nikic/PHP-Parser/blob/b0edd4c41111042d43bb45c6c657b2e0db367d9e/lib/PhpParser/Node/Scalar/String_.php#L132-L154
	 */
	private static function codePointToUtf8(int $num): string
	{
		if ($num <= 0x7F) {
			return chr($num);
		}
		if ($num <= 0x7FF) {
			return chr(($num >> 6) + 0xC0)
				. chr(($num & 0x3F) + 0x80);
		}
		if ($num <= 0xFFFF) {
			return chr(($num >> 12) + 0xE0)
				. chr((($num >> 6) & 0x3F) + 0x80)
				. chr(($num & 0x3F) + 0x80);
		}
		if ($num <= 0x1FFFFF) {
			return chr(($num >> 18) + 0xF0)
				. chr((($num >> 12) & 0x3F) + 0x80)
				. chr((($num >> 6) & 0x3F) + 0x80)
				. chr(($num & 0x3F) + 0x80);
		}

// Invalid UTF-8 codepoint escape sequence: Codepoint too large
		return "\xef\xbf\xbd";
	}

}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	fits-hosting.de_5pri7emmx1j/psacln	0755	2024-10-13 11:29:49
..	dir	-	fits-hosting.de_5pri7emmx1j/psacln	0755	2024-10-13 11:29:49
ConstExprParser.php	text/x-php	7.63 KB	fits-hosting.de_5pri7emmx1j/psacln	0644	2024-10-13 11:29:49
ParserException.php	text/x-php	2.11 KB	fits-hosting.de_5pri7emmx1j/psacln	0644	2024-10-13 11:29:49
PhpDocParser.php	text/x-php	36.91 KB	fits-hosting.de_5pri7emmx1j/psacln	0644	2024-10-13 11:29:49
StringUnescaper.php	text/x-php	2.34 KB	fits-hosting.de_5pri7emmx1j/psacln	0644	2024-10-13 11:29:49
TokenIterator.php	text/x-php	7.66 KB	fits-hosting.de_5pri7emmx1j/psacln	0644	2024-10-13 11:29:49
TypeParser.php	text/x-php	30.96 KB	fits-hosting.de_5pri7emmx1j/psacln	0644	2024-10-13 11:29:49

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