477 lines
15 KiB
Python
477 lines
15 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.conf import settings
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from django.utils.translation import pgettext, get_language
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class Language:
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"""A language.
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Args:
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language (str): The Django language code.
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Attributes:
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id (str): The language ID
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db (str): The database column suffix of this language.
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locale (str); The locale name of this language.
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is_default (bool): Whether this is the default language.
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"""
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id = None
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db = None
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locale = None
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is_default = False
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def __init__(self, language):
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self.id = language
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self.db = "_" + language.lower().replace("-", "_")
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if language == "zh-hant":
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self.locale = "zh-TW"
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elif language == "zh-hans":
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self.locale = "zh-CN"
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else:
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self.locale = language
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self.is_default = (language == settings.LANGUAGE_CODE)
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@staticmethod
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def default():
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return Language(settings.LANGUAGE_CODE)
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@staticmethod
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def current():
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return Language(get_language())
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def get_multi_lingual_attr(model, name, default=None):
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"""Returns a multi-lingual attribute of a data model.
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Args:
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model (object): The data model.
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name (str): The attribute name.
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default (str): The default language.
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Returns:
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(any): The attribute in this language, or in the default
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language if there is no content in the current language.
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"""
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language = Language.current()
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title = getattr(model, name + language.db)
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if default is None:
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default = Language.default().id
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if language.id == default:
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return title
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if title is not None:
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return title
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return getattr(model, name + Language.default().db)
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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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PaginationException: With invalid pagination parameters
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Attributes:
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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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page_size_options(list[PageSizeOptions]): The page size
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options
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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, request, records, is_reversed=False):
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current_url = request.get_full_path()
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self._current_url = current_url
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self.is_reversed = is_reversed
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# The page size
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try:
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self.page_size = int(request.GET["page-size"])
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if self.page_size == self.DEFAULT_PAGE_SIZE:
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raise PaginationException(str(
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UrlBuilder(current_url).del_param("page-size")))
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if self.page_size < 1:
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raise PaginationException(str(
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UrlBuilder(current_url).del_param("page-size")))
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except KeyError:
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self.page_size = self.DEFAULT_PAGE_SIZE
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except ValueError:
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raise PaginationException(str(
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UrlBuilder(current_url).del_param("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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default_page_no = 1 if not is_reversed else self.total_pages
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self.is_paged = self.total_pages > 1
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# The page number
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try:
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self.page_no = int(request.GET["page"])
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if not self.is_paged:
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raise PaginationException(str(
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UrlBuilder(current_url).del_param("page")))
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if self.page_no == default_page_no:
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raise PaginationException(str(
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UrlBuilder(current_url).del_param("page")))
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if self.page_no < 1:
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raise PaginationException(str(
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UrlBuilder(current_url).del_param("page")))
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if self.page_no > self.total_pages:
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raise PaginationException(str(
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UrlBuilder(current_url).del_param("page")))
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except KeyError:
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self.page_no = default_page_no
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except ValueError:
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raise PaginationException(str(
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UrlBuilder(current_url).del_param("page")))
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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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return
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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(
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"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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@property
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def page_size_options(self):
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base_url = UrlBuilder(self._current_url).del_param(
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"page").del_param("page-size")
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return [self.PageSizeOption(x, self._page_size_url(base_url, x))
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for x in [10, 100, 200]]
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@staticmethod
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def _page_size_url(base_url, size):
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"""Returns the URL for a new page size.
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Args:
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base_url (UrlBuilder): The base URL builder.
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size (int): The new page size.
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Returns:
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str: The URL for the new page size.
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"""
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if size == Pagination.DEFAULT_PAGE_SIZE:
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return str(base_url)
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return str(base_url.clone().add_param("page-size", str(size)))
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class PageSizeOption:
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"""A page size option.
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Args:
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size (int): The page size.
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url (str): The URL of this page size.
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Attributes:
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size (int): The page size.
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url (str): The URL for this page size.
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"""
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size = None
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url = None
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def __init__(self, size, url):
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self.size = size
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self.url = url
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class PaginationException(Exception):
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"""The exception thrown with invalid pagination parameters.
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Args:
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url (str): The canonical URL to redirect to.
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Attributes:
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url (str): The canonical URL to redirect to.
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"""
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url = None
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def __init__(self, url):
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self.url = url
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class SqlQuery:
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"""A SQL query statement with its parameters.
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Args:
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sql (str): The SQL statement.
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params (list[str]): the parameters.
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Attributes:
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sql (str): The SQL statement.
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params (list[str]): the parameters.
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"""
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sql = ""
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params = []
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def __init__(self, sql, params):
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self.sql = sql
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self.params = params
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