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1from __future__ import annotations
3from typing import TYPE_CHECKING
5from isoduration.formatter.exceptions import DurationFormattingException
7if TYPE_CHECKING: # pragma: no cover
8 from isoduration.types import DateDuration, Duration
11def check_global_sign(duration: Duration) -> int:
12 is_date_zero = (
13 duration.date.years == 0
14 and duration.date.months == 0
15 and duration.date.days == 0
16 and duration.date.weeks == 0
17 )
18 is_time_zero = (
19 duration.time.hours == 0
20 and duration.time.minutes == 0
21 and duration.time.seconds == 0
22 )
24 is_date_negative = (
25 duration.date.years <= 0
26 and duration.date.months <= 0
27 and duration.date.days <= 0
28 and duration.date.weeks <= 0
29 )
30 is_time_negative = (
31 duration.time.hours <= 0
32 and duration.time.minutes <= 0
33 and duration.time.seconds <= 0
34 )
36 if not is_date_zero and not is_time_zero:
37 if is_date_negative and is_time_negative:
38 return -1
39 elif not is_date_zero:
40 if is_date_negative:
41 return -1
42 elif not is_time_zero:
43 if is_time_negative:
44 return -1
46 return +1
49def validate_date_duration(date_duration: DateDuration) -> None:
50 if date_duration.weeks:
51 if date_duration.years or date_duration.months or date_duration.days:
52 raise DurationFormattingException(
53 "Weeks are incompatible with other date designators"
54 )