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from __future__ import absolute_import
import os
import struct
from contextlib import contextmanager
from datetime import date
from datetime import datetime
from datetime import timedelta
from math import copysign
from typing import TYPE_CHECKING
from typing import Iterator
from typing import Optional
from typing import TypeVar
from typing import overload
import pendulum
from .constants import DAYS_PER_MONTHS
from .formatting.difference_formatter import DifferenceFormatter
from .locales.locale import Locale
if TYPE_CHECKING:
# Prevent import cycles
from .period import Period
with_extensions = os.getenv("PENDULUM_EXTENSIONS", "1") == "1"
_DT = TypeVar("_DT", bound=datetime)
_D = TypeVar("_D", bound=date)
try:
if not with_extensions or struct.calcsize("P") == 4:
raise ImportError()
from ._extensions._helpers import local_time
from ._extensions._helpers import precise_diff
from ._extensions._helpers import is_leap
from ._extensions._helpers import is_long_year
from ._extensions._helpers import week_day
from ._extensions._helpers import days_in_year
from ._extensions._helpers import timestamp
except ImportError:
from ._extensions.helpers import local_time # noqa
from ._extensions.helpers import precise_diff # noqa
from ._extensions.helpers import is_leap # noqa
from ._extensions.helpers import is_long_year # noqa
from ._extensions.helpers import week_day # noqa
from ._extensions.helpers import days_in_year # noqa
from ._extensions.helpers import timestamp # noqa
difference_formatter = DifferenceFormatter()
@overload
def add_duration(
dt, # type: _DT
years=0, # type: int
months=0, # type: int
weeks=0, # type: int
days=0, # type: int
hours=0, # type: int
minutes=0, # type: int
seconds=0, # type: int
microseconds=0, # type: int
): # type: (...) -> _DT
pass
@overload
def add_duration(
dt, # type: _D
years=0, # type: int
months=0, # type: int
weeks=0, # type: int
days=0, # type: int
): # type: (...) -> _D
pass
def add_duration(
dt,
years=0,
months=0,
weeks=0,
days=0,
hours=0,
minutes=0,
seconds=0,
microseconds=0,
):
"""
Adds a duration to a date/datetime instance.
"""
days += weeks * 7
if (
isinstance(dt, date)
and not isinstance(dt, datetime)
and any([hours, minutes, seconds, microseconds])
):
raise RuntimeError("Time elements cannot be added to a date instance.")
# Normalizing
if abs(microseconds) > 999999:
s = _sign(microseconds)
div, mod = divmod(microseconds * s, 1000000)
microseconds = mod * s
seconds += div * s
if abs(seconds) > 59:
s = _sign(seconds)
div, mod = divmod(seconds * s, 60)
seconds = mod * s
minutes += div * s
if abs(minutes) > 59:
s = _sign(minutes)
div, mod = divmod(minutes * s, 60)
minutes = mod * s
hours += div * s
if abs(hours) > 23:
s = _sign(hours)
div, mod = divmod(hours * s, 24)
hours = mod * s
days += div * s
if abs(months) > 11:
s = _sign(months)
div, mod = divmod(months * s, 12)
months = mod * s
years += div * s
year = dt.year + years
month = dt.month
if months:
month += months
if month > 12:
year += 1
month -= 12
elif month < 1:
year -= 1
month += 12
day = min(DAYS_PER_MONTHS[int(is_leap(year))][month], dt.day)
dt = dt.replace(year=year, month=month, day=day)
return dt + timedelta(
days=days,
hours=hours,
minutes=minutes,
seconds=seconds,
microseconds=microseconds,
)
def format_diff(
diff, is_now=True, absolute=False, locale=None
): # type: (Period, bool, bool, Optional[str]) -> str
if locale is None:
locale = get_locale()
return difference_formatter.format(diff, is_now, absolute, locale)
def _sign(x):
return int(copysign(1, x))
# Global helpers
@contextmanager
def test(mock): # type: (pendulum.DateTime) -> Iterator[None]
set_test_now(mock)
try:
yield
finally:
set_test_now()
def set_test_now(test_now=None): # type: (Optional[pendulum.DateTime]) -> None
pendulum._TEST_NOW = test_now
def get_test_now(): # type: () -> Optional[pendulum.DateTime]
return pendulum._TEST_NOW
def has_test_now(): # type: () -> bool
return pendulum._TEST_NOW is not None
def locale(name): # type: (str) -> Locale
return Locale.load(name)
def set_locale(name): # type: (str) -> None
locale(name)
pendulum._LOCALE = name
def get_locale(): # type: () -> str
return pendulum._LOCALE
def week_starts_at(wday): # type: (int) -> None
if wday < pendulum.SUNDAY or wday > pendulum.SATURDAY:
raise ValueError("Invalid week day as start of week.")
pendulum._WEEK_STARTS_AT = wday
def week_ends_at(wday): # type: (int) -> None
if wday < pendulum.SUNDAY or wday > pendulum.SATURDAY:
raise ValueError("Invalid week day as start of week.")
pendulum._WEEK_ENDS_AT = wday
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