<?php

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
    {
        $callback = function ($match) {
            return $this->unescapeCharacter($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 $value): string
    {
        switch ($value[1]) {
            case '0':
                return "\x0";
            case 'a':
                return "\x7";
            case 'b':
                return "\x8";
            case 't':
                return "\t";
            case "\t":
                return "\t";
            case 'n':
                return "\n";
            case 'v':
                return "\xB";
            case 'f':
                return "\xC";
            case 'r':
                return "\r";
            case 'e':
                return "\x1B";
            case ' ':
                return ' ';
            case '"':
                return '"';
            case '/':
                return '/';
            case '\\':
                return '\\';
            case 'N':
                // U+0085 NEXT LINE
                return "\xC2\x85";
            case '_':
                // U+00A0 NO-BREAK SPACE
                return "\xC2\xA0";
            case 'L':
                // U+2028 LINE SEPARATOR
                return "\xE2\x80\xA8";
            case 'P':
                // U+2029 PARAGRAPH SEPARATOR
                return "\xE2\x80\xA9";
            case 'x':
                return self::utf8chr(hexdec(substr($value, 2, 2)));
            case 'u':
                return self::utf8chr(hexdec(substr($value, 2, 4)));
            case 'U':
                return 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);
    }
}
__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MTY0NTEwODkwMjY5NzgyOSAyODM4NTk5MjkyODI5MzY1IDk0NDYyOTA0ODU1MDQ5MTk=