85 lines
2.4 KiB
Python
85 lines
2.4 KiB
Python
# The accounting application of the Mia project.
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# by imacat <imacat@mail.imacat.idv.tw>, 2020/6/30
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# Copyright (c) 2020 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 utilities of the accounting application.
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"""
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class PeriodParser:
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"""The period parser.
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Attributes:
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start: The start of the period.
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end: The end of the period.
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"""
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start = None
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end = None
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def __init__(self, period_spec):
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"""Constructs a new period parser.
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Args:
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period_spec (str): The period specification.
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"""
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self.start = period_spec + "-01"
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self.end = period_spec + "-30"
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class Pagination:
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"""The pagination.
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Attributes:
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page_no (int): The current page number
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page_size (int): The page size
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"""
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page_no = None
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page_size = None
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DEFAULT_PAGE_SIZE = 10
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def __init__(self, count, page_no, page_size, is_reverse = False):
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"""Constructs a new pagination.
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Args:
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count (int): The total number of records
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page_no (int): The specified page number
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page_size (int): The specified number of records per page
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is_reverse (bool): Whether we should display the last
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page first
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Raises:
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PageNoOutOfRangeError: if the specified page number is out
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of range or is redundant.
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"""
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self.page_size = page_size \
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if page_size is not None \
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else self.DEFAULT_PAGE_SIZE
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total_pages = int((count - 1) / self.page_size) + 1
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default_page = 1 if not is_reverse else total_pages
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if page_no == default_page:
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raise PageNoOutOfRangeError()
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self.page_no = page_no \
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if page_no is not None \
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else default_page
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if self.page_no > total_pages:
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raise PageNoOutOfRangeError()
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class PageNoOutOfRangeError(Exception):
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pass
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