mia-accounting-django/accounting/utils.py

78 lines
2.2 KiB
Python

# The accounting application of the Mia project.
# by imacat <imacat@mail.imacat.idv.tw>, 2020/6/30
# Copyright (c) 2020 imacat.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""The utilities of the accounting application.
"""
class PeriodParser:
"""The period parser.
Attributes:
start: The start of the period.
end: The end of the period.
"""
start = None
end = None
def __init__(self, period_spec):
"""Constructs a new period parser.
Args:
period_spec (str): The period specification.
"""
self.start = period_spec + "-01"
self.end = period_spec + "-30"
class Pagination:
"""The pagination.
Attributes:
page_no (int): The current page number
page_size (int): The page size
"""
page_no = None
page_size = None
DEFAULT_PAGE_SIZE = 10
def __init__(self, count, page_no, page_size, is_reverse = False):
"""Constructs a new pagination.
Args:
count (int): The total number of records
page_no (int): The specified page number
page_size (int): The specified number of records per page
is_reverse (bool): Whether we should display the last
page first
"""
self.page_size = page_size \
if page_size is not None \
else self.DEFAULT_PAGE_SIZE
total_pages = int((count - 1) / self.page_size) + 1
self.page_no = page_no \
if page_no is not None \
else 1 if not is_reverse else total_pages
if self.page_no > total_pages:
raise PageNoOutOfRangeError()
class PageNoOutOfRangeError(Exception):
pass