public final long readFieldNameHashCodeUnquote()

in core/src/main/java/com/alibaba/fastjson2/JSONReaderUTF16.java [921:1140]

• 207 lines of code
• 112 McCabe index (conditional complexity)

    public final long readFieldNameHashCodeUnquote() {
        this.nameEscape = false;
        int offset = this.offset, end = this.end;
        final char[] chars = this.chars;
        char ch = this.ch;
        this.nameBegin = offset - 1;
        char first = ch;
        long nameValue = 0;
        _for:
        for (int i = 0; offset <= end; ++i) {
            switch (ch) {
                case ' ':
                case '\n':
                case '\r':
                case '\t':
                case '\f':
                case '\b':
                case '.':
                case '-':
                case '+':
                case '*':
                case '/':
                case '>':
                case '<':
                case '=':
                case '!':
                case '[':
                case ']':
                case '{':
                case '}':
                case '(':
                case ')':
                case ',':
                case ':':
                case '|':
                case '&':
                case EOI:
                    nameLength = i;
                    this.nameEnd = ch == EOI ? offset : offset - 1;
                    if (ch <= ' ' && ((1L << ch) & SPACE) != 0) {
                        ch = offset == end ? EOI : chars[offset++];
                    }
                    break _for;
                default:
                    break;
            }

            if (ch == '\\') {
                nameEscape = true;
                ch = chars[offset++];
                switch (ch) {
                    case 'u': {
                        ch = (char) hexDigit4(chars, check3(offset, end));
                        offset += 4;
                        break;
                    }
                    case 'x': {
                        ch = char2(chars[offset], chars[offset + 1]);
                        offset += 2;
                        break;
                    }
                    case '\\':
                    case '"':
                    case '.':
                    case '-':
                    case '+':
                    case '*':
                    case '/':
                    case '>':
                    case '<':
                    case '=':
                    case '@':
                    case ':':
                        break;
                    default:
                        ch = char1(ch);
                        break;
                }
            }

            if (ch > 0xFF || i >= 8 || (i == 0 && ch == 0)) {
                nameValue = 0;
                ch = first;
                offset = this.nameBegin + 1;
                break;
            }

            byte c = (byte) ch;
            switch (i) {
                case 0:
                    nameValue = c;
                    break;
                case 1:
                    nameValue = (c << 8) + (nameValue & 0xFFL);
                    break;
                case 2:
                    nameValue = (c << 16) + (nameValue & 0xFFFFL);
                    break;
                case 3:
                    nameValue = (c << 24) + (nameValue & 0xFFFFFFL);
                    break;
                case 4:
                    nameValue = (((long) c) << 32) + (nameValue & 0xFFFFFFFFL);
                    break;
                case 5:
                    nameValue = (((long) c) << 40L) + (nameValue & 0xFFFFFFFFFFL);
                    break;
                case 6:
                    nameValue = (((long) c) << 48L) + (nameValue & 0xFFFFFFFFFFFFL);
                    break;
                case 7:
                    nameValue = (((long) c) << 56L) + (nameValue & 0xFFFFFFFFFFFFFFL);
                    break;
                default:
                    break;
            }

            ch = offset == end ? EOI : chars[offset++];
        }

        long hashCode;

        if (nameValue != 0) {
            hashCode = nameValue;
        } else {
            hashCode = Fnv.MAGIC_HASH_CODE;
            _for:
            for (int i = 0; ; ++i) {
                if (ch == '\\') {
                    nameEscape = true;
                    ch = chars[offset++];
                    switch (ch) {
                        case 'u': {
                            ch = (char) hexDigit4(chars, check3(offset, end));
                            offset += 4;
                            break;
                        }
                        case 'x': {
                            ch = char2(chars[offset], chars[offset + 1]);
                            offset += 2;
                            break;
                        }
                        case '\\':
                        case '"':
                        case '.':
                        case '-':
                        case '+':
                        case '*':
                        case '/':
                        case '>':
                        case '<':
                        case '=':
                        case '@':
                        case ':':
                            break;
                        default:
                            ch = char1(ch);
                            break;
                    }

                    hashCode ^= ch;
                    hashCode *= Fnv.MAGIC_PRIME;
                    ch = offset == end ? EOI : chars[offset++];
                    continue;
                }

                switch (ch) {
                    case ' ':
                    case '\n':
                    case '\r':
                    case '\t':
                    case '\f':
                    case '\b':
                    case '.':
                    case '-':
                    case '+':
                    case '*':
                    case '/':
                    case '>':
                    case '<':
                    case '=':
                    case '!':
                    case '[':
                    case ']':
                    case '{':
                    case '}':
                    case '(':
                    case ')':
                    case ',':
                    case ':':
                    case EOI:
                        nameLength = i;
                        this.nameEnd = ch == EOI ? offset : offset - 1;
                        while (ch <= ' ' && ((1L << ch) & SPACE) != 0) {
                            ch = offset == end ? EOI : chars[offset++];
                        }
                        break _for;
                    default:
                        break;
                }

                hashCode ^= ch;
                hashCode *= Fnv.MAGIC_PRIME;

                ch = offset == end ? EOI : chars[offset++];
            }
        }

        if (ch == ':') {
            ch = offset == end ? EOI : chars[offset++];
            while (ch <= ' ' && ((1L << ch) & SPACE) != 0) {
                ch = offset == end ? EOI : chars[offset++];
            }
        }

        this.offset = offset;
        this.ch = ch;

        return hashCode;
    }