130 lines
4.4 KiB
Python
130 lines
4.4 KiB
Python
# The Mia! Accounting Flask Project.
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# Author: imacat@mail.imacat.idv.tw (imacat), 2023/3/4
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# Copyright (c) 2023 imacat.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""The date period.
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This file is largely taken from the NanoParma ERP project, first written in
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2021/9/16 by imacat (imacat@nanoparma.com).
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"""
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import typing as t
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from datetime import date, timedelta
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from .description import get_desc
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from .month_end import month_end
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from .specification import get_spec
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class Period:
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"""A date period."""
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def __init__(self, start: date | None, end: date | None):
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"""Constructs a new date period.
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:param start: The start date, or None from the very beginning.
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:param end: The end date, or None till no end.
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"""
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self.start: date | None = start
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"""The start of the period."""
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self.end: date | None = end
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"""The end of the period."""
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self.is_default: bool = False
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"""Whether the is the default period."""
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self.is_this_month: bool = False
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"""Whether the period is this month."""
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self.is_last_month: bool = False
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"""Whether the period is last month."""
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self.is_since_last_month: bool = False
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"""Whether the period is since last month."""
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self.is_this_year: bool = False
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"""Whether the period is this year."""
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self.is_last_year: bool = False
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"""Whether the period is last year."""
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self.is_today: bool = False
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"""Whether the period is today."""
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self.is_yesterday: bool = False
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"""Whether the period is yesterday."""
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self.is_all: bool = start is None and end is None
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"""Whether the period is all time."""
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self.spec: str = ""
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"""The period specification."""
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self.desc: str = ""
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"""The text description."""
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self.is_a_month: bool = False
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"""Whether the period is a whole month."""
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self.is_type_month: bool = False
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"""Whether the period is for the month chooser."""
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self.is_a_year: bool = False
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"""Whether the period is a whole year."""
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self.is_a_day: bool = False
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"""Whether the period is a single day."""
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self._set_properties()
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def _set_properties(self) -> None:
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"""Sets the following properties.
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* self.spec
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* self.desc
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* self.is_a_month
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* self.is_type_month
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* self.is_a_year
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* self.is_a_day
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Override this method to set the properties in the subclasses, to skip
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the calculation.
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:return: None.
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"""
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self.spec = get_spec(self.start, self.end)
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self.desc = get_desc(self.start, self.end)
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if self.start is None or self.end is None:
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return
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self.is_a_month = self.start.day == 1 \
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and self.end == month_end(self.start)
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self.is_type_month = self.is_a_month
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self.is_a_year = self.start == date(self.start.year, 1, 1) \
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and self.end == date(self.start.year, 12, 31)
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self.is_a_day = self.start == self.end
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def is_year(self, year: int) -> bool:
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"""Returns whether the period is the specific year period.
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:param year: The year.
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:return: True if the period is the year period, or False otherwise.
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"""
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if not self.is_a_year:
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return False
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return self.start.year == year
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@property
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def is_type_arbitrary(self) -> bool:
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"""Returns whether this period is an arbitrary period.
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:return: True if this is an arbitrary period, or False otherwise.
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"""
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return not self.is_type_month and not self.is_a_year \
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and not self.is_a_day
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@property
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def before(self) -> t.Self | None:
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"""Returns the period before this period.
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:return: The period before this period.
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"""
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if self.start is None:
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return None
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return Period(None, self.start - timedelta(days=1))
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