322 lines
10 KiB
Python
322 lines
10 KiB
Python
# The core application of the Mia project.
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# by imacat <imacat@mail.imacat.idv.tw>, 2020/7/1
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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 views of the mia core application.
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"""
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import urllib.parse
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from django.utils.translation import pgettext
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class UrlBuilder:
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"""The URL builder.
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Attributes:
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base_path (str): the base path
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params (list[Param]): The query parameters
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"""
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base_path = None
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params = []
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def __init__(self, start_url):
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"""Constructs a new URL builder.
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Args:
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start_url (str): The URL to start with
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"""
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pos = start_url.find("?")
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if pos == -1:
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self.base_path = start_url
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return
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self.base_path = start_url[:pos]
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self.params = []
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for piece in start_url[pos+1:].split("&"):
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pos = piece.find("=")
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name = urllib.parse.unquote(piece[:pos])
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value = urllib.parse.unquote(piece[pos+1:])
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self.params.append(self.Param(name, value))
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def add_param(self, name, value):
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"""Adds a query parameter.
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Args:
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name (str): The parameter name
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value (str): The parameter value
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Returns:
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UrlBuilder: The URL builder itself, with the parameter
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modified.
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"""
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self.params.append(self.Param(name, value))
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return self
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def del_param(self, name):
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"""Removes a query parameter.
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Args:
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name (str): The parameter name
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Returns:
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UrlBuilder: The URL builder itself, with the parameter
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modified.
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"""
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self.params = [x for x in self.params if x.name != name]
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return self
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def set_param(self, name, value):
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"""Sets a query parameter. The current parameters with the
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same name will be replaced.
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Args:
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name (str): The parameter name
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value (str): The parameter value
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Returns:
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UrlBuilder: The URL builder itself, with the parameter
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modified.
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"""
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return self.del_param(name).add_param(name, value)
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def clone(self):
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"""Returns a copy of this URL builder.
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Returns:
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UrlBuilder: A copy of this URL builder.
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"""
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another = UrlBuilder(self.base_path)
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another.params = [
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self.Param(x.name, x.value) for x in self.params]
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return another
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def __str__(self):
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if len(self.params) == 0:
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return self.base_path
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return self.base_path + "?" + "&".join([
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str(x) for x in self.params])
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class Param:
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"""A query parameter.
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Attributes:
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name (str): The parameter name
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value (str): The parameter value
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"""
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name = None
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value = None
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def __init__(self, name, value):
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"""Constructs a new query parameter
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Args:
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name (str): The parameter name
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value (str): The parameter value
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"""
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self.name = name
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self.value = value
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def __str__(self):
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"""Returns the string representation of this query
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parameter.
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Returns:
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str: The string representation of this query
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parameter
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"""
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return "%s=%s" % (
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urllib.parse.quote(self.name),
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urllib.parse.quote(self.value))
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class Pagination:
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"""The pagination.
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Args:
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request (HttpRequest): The request
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records (list[Model]): All the 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_reversed (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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Attributes:
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current_url (bool): The current request URL
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is_reversed (bool): Whether we should display the last
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page first
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page_size (int): The page size.
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total_pages (int): The total number of pages available.
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is_paged (bool): Whether there are more than one page.
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page_no (int): The current page number.
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records (list[Model]): The records in the current page.
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links (list[Link]): The navigation links in the pagination
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bar.
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"""
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current_url = None
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is_reversed = False
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page_size = None
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total_pages = None
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is_paged = None
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page_no = None
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records = None
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DEFAULT_PAGE_SIZE = 10
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def __init__(self, current_url, records, page_no,
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page_size, is_reversed=False):
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self.current_url = current_url
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self.is_reversed = is_reversed
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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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self.total_pages = int(
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(len(records) - 1) / self.page_size) + 1
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self.is_paged = self.total_pages > 1
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if not self.is_paged:
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self.page_no = 1
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self.records = records
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self._links = []
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return
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default_page = 1 if not is_reversed else self.total_pages
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if page_no == default_page:
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raise PageNoOutOfRangeException()
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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 > self.total_pages:
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raise PageNoOutOfRangeException()
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start_no = self.page_size * (self.page_no - 1)
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self.records = records[start_no:start_no + self.page_size]
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_links = None
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@property
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def links(self):
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"""Returns the navigation links of the pagination bar."""
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if self._links is None:
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base_url = UrlBuilder(self.current_url).del_param("page")
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self._links = []
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# The previous page
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link = self.Link()
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link.title = pgettext("Pagination|", "Previous")
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if self.page_no > 1:
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if self.page_no - 1 == 1:
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if not self.is_reversed:
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link.url = str(base_url)
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else:
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link.url = str(base_url.clone().add_param(
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"page", "1"))
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else:
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link.url = str(base_url.clone().add_param(
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"page", str(self.page_no - 1)))
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link.is_small_screen = True
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self._links.append(link)
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# The first page
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link = self.Link()
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link.title = "1"
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if not self.is_reversed:
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link.url = str(base_url)
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else:
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link.url = str(base_url.clone().add_param("page", "1"))
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if self.page_no == 1:
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link.is_active = True
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self._links.append(link)
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# The previous ellipsis
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if self.page_no > 4:
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link = self.Link()
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if self.page_no > 5:
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link.title = pgettext("Pagination|", "...")
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else:
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link.title = "2"
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link.url = str(base_url.clone().add_param(
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"page", "2"))
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self._links.append(link)
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# The nearby pages
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for no in range(self.page_no - 2, self.page_no + 3):
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if no <= 1 or no >= self.total_pages:
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continue
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link = self.Link()
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link.title = str(no)
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link.url = str(base_url.clone().add_param(
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"page", str(no)))
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if no == self.page_no:
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link.is_active = True
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self._links.append(link)
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# The next ellipsis
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if self.page_no + 3 < self.total_pages:
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link = self.Link()
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if self.page_no + 4 < self.total_pages:
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link.title = pgettext("Pagination|", "...")
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else:
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link.title = str(self.total_pages - 1)
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link.url = str(base_url.clone().add_param(
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"page", str(self.total_pages - 1)))
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self._links.append(link)
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# The last page
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link = self.Link()
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link.title = str(self.total_pages)
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if self.is_reversed:
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link.url = str(base_url)
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else:
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link.url = str(base_url.clone().add_param(
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"page", str(self.total_pages)))
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if self.page_no == self.total_pages:
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link.is_active = True
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self._links.append(link)
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# The next page
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link = self.Link()
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link.title = pgettext("Pagination|", "Next")
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if self.page_no < self.total_pages:
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if self.page_no + 1 == self.total_pages:
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if self.is_reversed:
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link.url = str(base_url)
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else:
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link.url = str(base_url.clone().add_param(
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"page", str(self.total_pages)))
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else:
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link.url = str(base_url.clone().add_param(
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"page", str(self.page_no + 1)))
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link.is_small_screen = True
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self._links.append(link)
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return self._links
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class Link:
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"""A navigation link in the pagination bar.
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Attributes:
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url (str): The link URL, or for a non-link slot.
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title (str): The title of the link.
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is_active (bool): Whether this link is currently active.
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is_small_screen (bool): Whether this link is for small
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screens
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"""
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url = None
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title = None
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is_active = False
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is_small_screen = False
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class PageNoOutOfRangeException(Exception):
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"""The error thrown when the specified page number is out of
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range.
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"""
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pass
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