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　晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 . Prv8 Shell

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Current File : //opt/cpanel/ea-wappspector/vendor/phpstan/phpdoc-parser/src/Parser/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";
	}

}

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