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StringUnescaper.php
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StringUnescaper.php
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<?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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Wed, Aug 19, 15:19 (3 w, 5 d ago)
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StringUnescaper.php (2 KB)

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