You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
111 lines
3.1 KiB
111 lines
3.1 KiB
2 years ago
|
<?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
|
||
|
|
{
|
||
|
|
$callback = function ($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 $value): string
|
||
|
|
{
|
||
|
|
return match ($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);
|
||
|
|
}
|
||
|
|
}
|