fn slow_offset()

in src/serialize/per_type/datetime.rs [169:203]

• 32 lines of code
• 4 McCabe index (conditional complexity)

    fn slow_offset(&self) -> Result<Offset, DateTimeError> {
        let tzinfo = ffi!(PyDateTime_DATE_GET_TZINFO(self.ptr));
        if ffi!(PyObject_HasAttr(tzinfo, CONVERT_METHOD_STR)) == 1 {
            // pendulum
            let py_offset = call_method!(self.ptr, UTCOFFSET_METHOD_STR);
            let offset = Offset {
                second: ffi!(PyDateTime_DELTA_GET_SECONDS(py_offset)),
                day: ffi!(PyDateTime_DELTA_GET_DAYS(py_offset)),
            };
            ffi!(Py_DECREF(py_offset));
            Ok(offset)
        } else if ffi!(PyObject_HasAttr(tzinfo, NORMALIZE_METHOD_STR)) == 1 {
            // pytz
            let method_ptr = call_method!(tzinfo, NORMALIZE_METHOD_STR, self.ptr);
            let py_offset = call_method!(method_ptr, UTCOFFSET_METHOD_STR);
            ffi!(Py_DECREF(method_ptr));
            let offset = Offset {
                second: ffi!(PyDateTime_DELTA_GET_SECONDS(py_offset)),
                day: ffi!(PyDateTime_DELTA_GET_DAYS(py_offset)),
            };
            ffi!(Py_DECREF(py_offset));
            Ok(offset)
        } else if ffi!(PyObject_HasAttr(tzinfo, DST_STR)) == 1 {
            // dateutil/arrow, datetime.timezone.utc
            let py_offset = call_method!(tzinfo, UTCOFFSET_METHOD_STR, self.ptr);
            let offset = Offset {
                second: ffi!(PyDateTime_DELTA_GET_SECONDS(py_offset)),
                day: ffi!(PyDateTime_DELTA_GET_DAYS(py_offset)),
            };
            ffi!(Py_DECREF(py_offset));
            Ok(offset)
        } else {
            Err(DateTimeError::LibraryUnsupported)
        }
    }