115 lines
4.4 KiB
Python
115 lines
4.4 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright(C) 2010-2013 Romain Bignon
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#
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# This file is part of weboob.
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#
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# weboob is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# weboob is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with weboob. If not, see <http://www.gnu.org/licenses/>.
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from datetime import date, timedelta
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try:
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from dateutil import tz
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except ImportError:
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raise ImportError('Please install python-dateutil')
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__all__ = ['local2utc', 'utc2local', 'LinearDateGuesser']
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def local2utc(dateobj):
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dateobj = dateobj.replace(tzinfo=tz.tzlocal())
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dateobj = dateobj.astimezone(tz.tzutc())
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return dateobj
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def utc2local(dateobj):
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dateobj = dateobj.replace(tzinfo=tz.tzutc())
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dateobj = dateobj.astimezone(tz.tzlocal())
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return dateobj
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class LinearDateGuesser(object):
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"""
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The aim of this class is to guess the exact date object from
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a day and a month, but not a year.
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It works with a start date (default is today), and all dates must be
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sorted from recent to older.
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"""
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def __init__(self, current_date=None, date_max_bump=timedelta(7)):
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self.date_max_bump = date_max_bump
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if current_date is None:
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current_date = date.today()
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self.current_date = current_date
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def try_assigning_year(self, day, month, start_year, max_year):
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"""
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Tries to create a date object with day, month and start_year and returns
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it.
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If it fails due to the year not matching the day+month combination
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(i.e. due to a ValueError -- TypeError and OverflowError are not
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handled), the previous or next years are tried until max_year is
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reached.
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In case initialization still fails with max_year, this function raises
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a ValueError.
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"""
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while 1:
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try:
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return date(start_year, month, day)
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except ValueError, e:
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if start_year == max_year:
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raise e
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start_year += cmp(max_year, start_year)
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def set_current_date(self, current_date):
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self.current_date = current_date
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def guess_date(self, day, month, change_current_date=True):
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""" Returns a date object built from a given day/month pair. """
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today = self.current_date
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# The website only provides dates using the 'DD/MM' string, so we have to
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# determine the most possible year by ourselves. This implies tracking
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# the current date.
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# However, we may also encounter "bumps" in the dates, e.g. "12/11,
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# 10/11, 10/11, 12/11, 09/11", so we have to be, well, quite tolerant,
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# by accepting dates in the near future (say, 7 days) of the current
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# date. (Please, kill me...)
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# We first try to keep the current year
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naively_parsed_date = self.try_assigning_year(day, month, today.year, today.year - 5)
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if (naively_parsed_date.year != today.year):
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# we most likely hit a 29/02 leading to a change of year
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if change_current_date:
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self.set_current_date(naively_parsed_date)
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return naively_parsed_date
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if (naively_parsed_date > today + self.date_max_bump):
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# if the date ends up too far in the future, consider it actually
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# belongs to the previous year
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parsed_date = date(today.year - 1, month, day)
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if change_current_date:
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self.set_current_date(parsed_date)
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elif (naively_parsed_date > today and naively_parsed_date <= today + self.date_max_bump):
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# if the date is in the near future, consider it is a bump
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parsed_date = naively_parsed_date
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# do not keep it as current date though
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else:
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# if the date is in the past, as expected, simply keep it
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parsed_date = naively_parsed_date
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# and make it the new current date
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if change_current_date:
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self.set_current_date(parsed_date)
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return parsed_date
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