function QuoteAwareConstExprStringNode::escapeDoubleQuotedString

1 call to QuoteAwareConstExprStringNode::escapeDoubleQuotedString()

QuoteAwareConstExprStringNode::__toString in vendor/phpstan/phpdoc-parser/src/Ast/ConstExpr/QuoteAwareConstExprStringNode.php

File

vendor/phpstan/phpdoc-parser/src/Ast/ConstExpr/QuoteAwareConstExprStringNode.php, line 48

Class

QuoteAwareConstExprStringNode

Namespace

PHPStan\PhpDocParser\Ast\ConstExpr

Code

private function escapeDoubleQuotedString() : string {
    $quote = '"';
    $escaped = addcslashes($this->value, "\n\r\t\f\v\$" . $quote . '\\');
    // Escape control characters and non-UTF-8 characters.
    // Regex based on https://stackoverflow.com/a/11709412/385378.
    $regex = '/(
              [\\x00-\\x08\\x0E-\\x1F] # Control characters
            | [\\xC0-\\xC1] # Invalid UTF-8 Bytes
            | [\\xF5-\\xFF] # Invalid UTF-8 Bytes
            | \\xE0(?=[\\x80-\\x9F]) # Overlong encoding of prior code point
            | \\xF0(?=[\\x80-\\x8F]) # Overlong encoding of prior code point
            | [\\xC2-\\xDF](?![\\x80-\\xBF]) # Invalid UTF-8 Sequence Start
            | [\\xE0-\\xEF](?![\\x80-\\xBF]{2}) # Invalid UTF-8 Sequence Start
            | [\\xF0-\\xF4](?![\\x80-\\xBF]{3}) # Invalid UTF-8 Sequence Start
            | (?<=[\\x00-\\x7F\\xF5-\\xFF])[\\x80-\\xBF] # Invalid UTF-8 Sequence Middle
            | (?<![\\xC2-\\xDF]|[\\xE0-\\xEF]|[\\xE0-\\xEF][\\x80-\\xBF]|[\\xF0-\\xF4]|[\\xF0-\\xF4][\\x80-\\xBF]|[\\xF0-\\xF4][\\x80-\\xBF]{2})[\\x80-\\xBF] # Overlong Sequence
            | (?<=[\\xE0-\\xEF])[\\x80-\\xBF](?![\\x80-\\xBF]) # Short 3 byte sequence
            | (?<=[\\xF0-\\xF4])[\\x80-\\xBF](?![\\x80-\\xBF]{2}) # Short 4 byte sequence
            | (?<=[\\xF0-\\xF4][\\x80-\\xBF])[\\x80-\\xBF](?![\\x80-\\xBF]) # Short 4 byte sequence (2)
        )/x';
    return preg_replace_callback($regex, static function ($matches) {
        assert(strlen($matches[0]) === 1);
        $hex = dechex(ord($matches[0]));
        return '\\x' . str_pad($hex, 2, '0', STR_PAD_LEFT);
    }, $escaped);
}