Function parseString

string.go:45–88

parseString parses as defined in https://httpwg.org/specs/rfc9651.html#parse-string.

(s *scanner)

// parseString parses as defined in
// https://httpwg.org/specs/rfc9651.html#parse-string.
func parseString(s *scanner) (string, error) {
	if s.eof() || s.data[s.off] != '"' {
		return "", &UnmarshalError{s.off, ErrInvalidStringFormat}
	}
	s.off++

	var b strings.Builder

	for !s.eof() {
		c := s.data[s.off]
		s.off++

		switch c {
		case '\\':
			if s.eof() {
				return "", &UnmarshalError{s.off, ErrInvalidStringFormat}
			}

			n := s.data[s.off]
			if n != '"' && n != '\\' {
				return "", &UnmarshalError{s.off, ErrInvalidStringFormat}
			}
			s.off++

			if err := b.WriteByte(n); err != nil {
				return "", err
			}

			continue
		case '"':
			return b.String(), nil
		default:
			if c <= '\u001F' || c >= unicode.MaxASCII {
				return "", &UnmarshalError{s.off, ErrInvalidStringFormat}
			}

			if err := b.WriteByte(c); err != nil {
				return "", err
			}
		}
	}

	return "", &UnmarshalError{s.off, ErrInvalidStringFormat}
}