func()

in decode.go [255:325]

• 51 lines of code
• 55 McCabe index (conditional complexity)

func (d *Decoder) DecodeValue() (interface{}, error) {
	var (
		err error
		tag byte
	)

	tag, err = d.ReadByte()
	if perrors.Is(err, io.EOF) {
		return nil, err
	}

	switch {
	case tag == BC_END:
		// return EOF error for end flag 'Z'
		return nil, io.EOF

	case tag == BC_NULL: // 'N': //null
		return nil, nil

	case tag == BC_TRUE: // 'T': //true
		return true, nil

	case tag == BC_FALSE: //'F': //false
		return false, nil

	case tag == BC_REF: // 'R': //ref, a int which represents the previous list or map
		return d.decRef(int32(tag))

	case (0x80 <= tag && tag <= 0xbf) || (0xc0 <= tag && tag <= 0xcf) ||
		(0xd0 <= tag && tag <= 0xd7) || tag == BC_INT: //'I': //int
		return d.decInt32(int32(tag))

	case (tag >= 0xd8 && tag <= 0xef) || (tag >= 0xf0 && tag <= 0xff) ||
		(tag >= 0x38 && tag <= 0x3f) || (tag == BC_LONG_INT) || (tag == BC_LONG): //'L': //long
		return d.decInt64(int32(tag))

	case (tag == BC_DATE_MINUTE) || (tag == BC_DATE): //'d': //date
		return d.decDate(int32(tag))

	case (tag == BC_DOUBLE_ZERO) || (tag == BC_DOUBLE_ONE) || (tag == BC_DOUBLE_BYTE) ||
		(tag == BC_DOUBLE_SHORT) || (tag == BC_DOUBLE_MILL) || (tag == BC_DOUBLE): //'D': //double
		return d.decDouble(int32(tag))

	// case 'S', 's', 'X', 'x': //string,xml
	case (tag == BC_STRING_CHUNK || tag == BC_STRING) ||
		(tag >= BC_STRING_DIRECT && tag <= STRING_DIRECT_MAX) ||
		(tag >= 0x30 && tag <= 0x33):
		return d.decString(int32(tag))

		// case 'B', 'b': //binary
	case (tag == BC_BINARY) || (tag == BC_BINARY_CHUNK) || (tag >= 0x20 && tag <= 0x2f) ||
		(tag >= BC_BINARY_SHORT && tag <= 0x3f):
		return d.decBinary(int32(tag))

	// case 'V': //list
	case (tag >= BC_LIST_DIRECT && tag <= 0x77) || (tag == BC_LIST_FIXED || tag == BC_LIST_VARIABLE) ||
		(tag >= BC_LIST_DIRECT_UNTYPED && tag <= 0x7f) ||
		(tag == BC_LIST_FIXED_UNTYPED || tag == BC_LIST_VARIABLE_UNTYPED):
		return d.decList(int32(tag))

	case (tag == BC_MAP) || (tag == BC_MAP_UNTYPED):
		return d.decMap(int32(tag))

	case (tag == BC_OBJECT_DEF) || (tag == BC_OBJECT) ||
		(BC_OBJECT_DIRECT <= tag && tag <= (BC_OBJECT_DIRECT+OBJECT_DIRECT_MAX)):
		return d.decObject(int32(tag))

	default:
		return nil, perrors.Errorf("Invalid type: %v,>>%v<<<", string(tag), d.peek(d.len()))
	}
}