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|
from __future__ import annotations
from typing import TYPE_CHECKING
from typing import cast
from pendulum.datetime import DateTime
from pendulum.utils._compat import PYPY
if TYPE_CHECKING:
from types import TracebackType
from typing_extensions import Self
class BaseTraveller:
def __init__(self, datetime_class: type[DateTime] = DateTime) -> None:
self._datetime_class: type[DateTime] = datetime_class
def freeze(self) -> Self:
raise self._not_implemented()
def travel_back(self) -> Self:
raise self._not_implemented()
def travel(
self,
years: int = 0,
months: int = 0,
weeks: int = 0,
days: int = 0,
hours: int = 0,
minutes: int = 0,
seconds: int = 0,
microseconds: int = 0,
) -> Self:
raise self._not_implemented()
def travel_to(self, dt: DateTime, *, freeze: bool = False) -> Self:
raise self._not_implemented()
def __enter__(self) -> Self:
return self
def __exit__(
self,
exc_type: type[BaseException] | None,
exc_val: BaseException | None,
exc_tb: TracebackType,
) -> None:
...
def _not_implemented(self) -> NotImplementedError:
return NotImplementedError()
if not PYPY:
try:
import time_machine
except ImportError:
time_machine = None # type: ignore[assignment]
if time_machine is not None:
class Traveller(BaseTraveller):
def __init__(self, datetime_class: type[DateTime] = DateTime) -> None:
super().__init__(datetime_class)
self._started: bool = False
self._traveller: time_machine.travel | None = None
self._coordinates: time_machine.Coordinates | None = None
def freeze(self) -> Self:
if self._started:
cast(time_machine.Coordinates, self._coordinates).move_to(
self._datetime_class.now(), tick=False
)
else:
self._start(freeze=True)
return self
def travel_back(self) -> Self:
if not self._started:
return self
cast(time_machine.travel, self._traveller).stop()
self._coordinates = None
self._traveller = None
self._started = False
return self
def travel(
self,
years: int = 0,
months: int = 0,
weeks: int = 0,
days: int = 0,
hours: int = 0,
minutes: int = 0,
seconds: int = 0,
microseconds: int = 0,
*,
freeze: bool = False,
) -> Self:
self._start(freeze=freeze)
cast(time_machine.Coordinates, self._coordinates).move_to(
self._datetime_class.now().add(
years=years,
months=months,
weeks=weeks,
days=days,
hours=hours,
minutes=minutes,
seconds=seconds,
microseconds=microseconds,
)
)
return self
def travel_to(self, dt: DateTime, *, freeze: bool = False) -> Self:
self._start(freeze=freeze)
cast(time_machine.Coordinates, self._coordinates).move_to(dt)
return self
def _start(self, freeze: bool = False) -> None:
if self._started:
return
if not self._traveller:
self._traveller = time_machine.travel(
self._datetime_class.now(), tick=not freeze
)
self._coordinates = self._traveller.start()
self._started = True
def __enter__(self) -> Self:
self._start()
return self
def __exit__(
self,
exc_type: type[BaseException] | None,
exc_val: BaseException | None,
exc_tb: TracebackType,
) -> None:
self.travel_back()
else:
class Traveller(BaseTraveller): # type: ignore[no-redef]
def _not_implemented(self) -> NotImplementedError:
return NotImplementedError(
"Time travelling is an optional feature. "
'You can add it by installing Pendulum with the "test" extra.'
)
else:
class Traveller(BaseTraveller): # type: ignore[no-redef]
def _not_implemented(self) -> NotImplementedError:
return NotImplementedError(
"Time travelling is not supported on the PyPy Python implementation."
)
|
