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1182 lines
42 KiB
Python
1182 lines
42 KiB
Python
# -*- coding: utf-8 -*-
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"""
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babel.dates
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~~~~~~~~~~~
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Locale dependent formatting and parsing of dates and times.
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The default locale for the functions in this module is determined by the
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following environment variables, in that order:
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* ``LC_TIME``,
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* ``LC_ALL``, and
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* ``LANG``
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:copyright: (c) 2013 by the Babel Team.
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:license: BSD, see LICENSE for more details.
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"""
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from __future__ import division
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import re
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import pytz as _pytz
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from datetime import date, datetime, time, timedelta
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from bisect import bisect_right
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from babel.core import default_locale, get_global, Locale
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from babel.util import UTC, LOCALTZ
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from babel._compat import string_types, integer_types, number_types
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LC_TIME = default_locale('LC_TIME')
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# Aliases for use in scopes where the modules are shadowed by local variables
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date_ = date
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datetime_ = datetime
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time_ = time
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def get_timezone(zone=None):
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"""Looks up a timezone by name and returns it. The timezone object
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returned comes from ``pytz`` and corresponds to the `tzinfo` interface and
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can be used with all of the functions of Babel that operate with dates.
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If a timezone is not known a :exc:`LookupError` is raised. If `zone`
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is ``None`` a local zone object is returned.
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:param zone: the name of the timezone to look up. If a timezone object
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itself is passed in, mit's returned unchanged.
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"""
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if zone is None:
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return LOCALTZ
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if not isinstance(zone, string_types):
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return zone
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try:
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return _pytz.timezone(zone)
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except _pytz.UnknownTimeZoneError:
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raise LookupError('Unknown timezone %s' % zone)
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def get_next_timezone_transition(zone=None, dt=None):
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"""Given a timezone it will return a :class:`TimezoneTransition` object
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that holds the information about the next timezone transition that's going
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to happen. For instance this can be used to detect when the next DST
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change is going to happen and how it looks like.
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The transition is calculated relative to the given datetime object. The
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next transition that follows the date is used. If a transition cannot
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be found the return value will be `None`.
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Transition information can only be provided for timezones returned by
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the :func:`get_timezone` function.
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:param zone: the timezone for which the transition should be looked up.
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If not provided the local timezone is used.
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:param dt: the date after which the next transition should be found.
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If not given the current time is assumed.
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"""
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zone = get_timezone(zone)
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if dt is None:
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dt = datetime.utcnow()
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else:
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dt = dt.replace(tzinfo=None)
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if not hasattr(zone, '_utc_transition_times'):
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raise TypeError('Given timezone does not have UTC transition '
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'times. This can happen because the operating '
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'system fallback local timezone is used or a '
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'custom timezone object')
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try:
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idx = max(0, bisect_right(zone._utc_transition_times, dt))
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old_trans = zone._transition_info[idx - 1]
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new_trans = zone._transition_info[idx]
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old_tz = zone._tzinfos[old_trans]
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new_tz = zone._tzinfos[new_trans]
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except (LookupError, ValueError):
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return None
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return TimezoneTransition(
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activates=zone._utc_transition_times[idx],
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from_tzinfo=old_tz,
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to_tzinfo=new_tz,
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reference_date=dt
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)
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class TimezoneTransition(object):
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"""A helper object that represents the return value from
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:func:`get_next_timezone_transition`.
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"""
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def __init__(self, activates, from_tzinfo, to_tzinfo, reference_date=None):
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#: the time of the activation of the timezone transition in UTC.
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self.activates = activates
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#: the timezone from where the transition starts.
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self.from_tzinfo = from_tzinfo
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#: the timezone for after the transition.
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self.to_tzinfo = to_tzinfo
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#: the reference date that was provided. This is the `dt` parameter
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#: to the :func:`get_next_timezone_transition`.
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self.reference_date = reference_date
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@property
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def from_tz(self):
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"""The name of the timezone before the transition."""
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return self.from_tzinfo._tzname
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@property
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def to_tz(self):
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"""The name of the timezone after the transition."""
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return self.to_tzinfo._tzname
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@property
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def from_offset(self):
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"""The UTC offset in seconds before the transition."""
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return int(self.from_tzinfo._utcoffset.total_seconds())
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@property
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def to_offset(self):
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"""The UTC offset in seconds after the transition."""
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return int(self.to_tzinfo._utcoffset.total_seconds())
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def __repr__(self):
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return '<TimezoneTransition %s -> %s (%s)>' % (
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self.from_tz,
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self.to_tz,
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self.activates,
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)
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def get_period_names(locale=LC_TIME):
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"""Return the names for day periods (AM/PM) used by the locale.
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>>> get_period_names(locale='en_US')['am']
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u'AM'
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:param locale: the `Locale` object, or a locale string
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"""
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return Locale.parse(locale).periods
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def get_day_names(width='wide', context='format', locale=LC_TIME):
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"""Return the day names used by the locale for the specified format.
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>>> get_day_names('wide', locale='en_US')[1]
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u'Tuesday'
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>>> get_day_names('abbreviated', locale='es')[1]
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u'mar'
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>>> get_day_names('narrow', context='stand-alone', locale='de_DE')[1]
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u'D'
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:param width: the width to use, one of "wide", "abbreviated", or "narrow"
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:param context: the context, either "format" or "stand-alone"
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:param locale: the `Locale` object, or a locale string
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"""
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return Locale.parse(locale).days[context][width]
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def get_month_names(width='wide', context='format', locale=LC_TIME):
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"""Return the month names used by the locale for the specified format.
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>>> get_month_names('wide', locale='en_US')[1]
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u'January'
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>>> get_month_names('abbreviated', locale='es')[1]
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u'ene'
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>>> get_month_names('narrow', context='stand-alone', locale='de_DE')[1]
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u'J'
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:param width: the width to use, one of "wide", "abbreviated", or "narrow"
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:param context: the context, either "format" or "stand-alone"
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:param locale: the `Locale` object, or a locale string
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"""
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return Locale.parse(locale).months[context][width]
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def get_quarter_names(width='wide', context='format', locale=LC_TIME):
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"""Return the quarter names used by the locale for the specified format.
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>>> get_quarter_names('wide', locale='en_US')[1]
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u'1st quarter'
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>>> get_quarter_names('abbreviated', locale='de_DE')[1]
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u'Q1'
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:param width: the width to use, one of "wide", "abbreviated", or "narrow"
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:param context: the context, either "format" or "stand-alone"
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:param locale: the `Locale` object, or a locale string
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"""
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return Locale.parse(locale).quarters[context][width]
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def get_era_names(width='wide', locale=LC_TIME):
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"""Return the era names used by the locale for the specified format.
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>>> get_era_names('wide', locale='en_US')[1]
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u'Anno Domini'
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>>> get_era_names('abbreviated', locale='de_DE')[1]
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u'n. Chr.'
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:param width: the width to use, either "wide", "abbreviated", or "narrow"
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:param locale: the `Locale` object, or a locale string
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"""
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return Locale.parse(locale).eras[width]
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def get_date_format(format='medium', locale=LC_TIME):
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"""Return the date formatting patterns used by the locale for the specified
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format.
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>>> get_date_format(locale='en_US')
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<DateTimePattern u'MMM d, y'>
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>>> get_date_format('full', locale='de_DE')
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<DateTimePattern u'EEEE, d. MMMM y'>
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:param format: the format to use, one of "full", "long", "medium", or
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"short"
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:param locale: the `Locale` object, or a locale string
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"""
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return Locale.parse(locale).date_formats[format]
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def get_datetime_format(format='medium', locale=LC_TIME):
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"""Return the datetime formatting patterns used by the locale for the
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specified format.
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>>> get_datetime_format(locale='en_US')
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u'{1}, {0}'
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:param format: the format to use, one of "full", "long", "medium", or
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"short"
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:param locale: the `Locale` object, or a locale string
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"""
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patterns = Locale.parse(locale).datetime_formats
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if format not in patterns:
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format = None
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return patterns[format]
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def get_time_format(format='medium', locale=LC_TIME):
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"""Return the time formatting patterns used by the locale for the specified
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format.
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>>> get_time_format(locale='en_US')
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<DateTimePattern u'h:mm:ss a'>
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>>> get_time_format('full', locale='de_DE')
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<DateTimePattern u'HH:mm:ss zzzz'>
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:param format: the format to use, one of "full", "long", "medium", or
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"short"
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:param locale: the `Locale` object, or a locale string
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"""
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return Locale.parse(locale).time_formats[format]
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def get_timezone_gmt(datetime=None, width='long', locale=LC_TIME):
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"""Return the timezone associated with the given `datetime` object formatted
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as string indicating the offset from GMT.
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>>> dt = datetime(2007, 4, 1, 15, 30)
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>>> get_timezone_gmt(dt, locale='en')
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u'GMT+00:00'
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>>> tz = get_timezone('America/Los_Angeles')
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>>> dt = datetime(2007, 4, 1, 15, 30, tzinfo=tz)
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>>> get_timezone_gmt(dt, locale='en')
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u'GMT-08:00'
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>>> get_timezone_gmt(dt, 'short', locale='en')
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u'-0800'
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The long format depends on the locale, for example in France the acronym
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UTC string is used instead of GMT:
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>>> get_timezone_gmt(dt, 'long', locale='fr_FR')
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u'UTC-08:00'
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.. versionadded:: 0.9
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:param datetime: the ``datetime`` object; if `None`, the current date and
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time in UTC is used
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:param width: either "long" or "short"
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:param locale: the `Locale` object, or a locale string
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"""
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if datetime is None:
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datetime = datetime_.utcnow()
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elif isinstance(datetime, integer_types):
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datetime = datetime_.utcfromtimestamp(datetime).time()
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if datetime.tzinfo is None:
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datetime = datetime.replace(tzinfo=UTC)
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locale = Locale.parse(locale)
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offset = datetime.tzinfo.utcoffset(datetime)
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seconds = offset.days * 24 * 60 * 60 + offset.seconds
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hours, seconds = divmod(seconds, 3600)
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if width == 'short':
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pattern = u'%+03d%02d'
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else:
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pattern = locale.zone_formats['gmt'] % '%+03d:%02d'
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return pattern % (hours, seconds // 60)
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def get_timezone_location(dt_or_tzinfo=None, locale=LC_TIME):
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"""Return a representation of the given timezone using "location format".
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The result depends on both the local display name of the country and the
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city associated with the time zone:
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>>> tz = get_timezone('America/St_Johns')
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>>> get_timezone_location(tz, locale='de_DE')
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u"Kanada (St. John's) Zeit"
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>>> tz = get_timezone('America/Mexico_City')
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>>> get_timezone_location(tz, locale='de_DE')
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u'Mexiko (Mexiko-Stadt) Zeit'
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If the timezone is associated with a country that uses only a single
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timezone, just the localized country name is returned:
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>>> tz = get_timezone('Europe/Berlin')
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>>> get_timezone_name(tz, locale='de_DE')
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u'Mitteleurop\\xe4ische Zeit'
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.. versionadded:: 0.9
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:param dt_or_tzinfo: the ``datetime`` or ``tzinfo`` object that determines
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the timezone; if `None`, the current date and time in
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UTC is assumed
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:param locale: the `Locale` object, or a locale string
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:return: the localized timezone name using location format
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"""
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if dt_or_tzinfo is None:
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dt = datetime.now()
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tzinfo = LOCALTZ
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elif isinstance(dt_or_tzinfo, string_types):
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dt = None
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tzinfo = get_timezone(dt_or_tzinfo)
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elif isinstance(dt_or_tzinfo, integer_types):
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dt = None
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tzinfo = UTC
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elif isinstance(dt_or_tzinfo, (datetime, time)):
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dt = dt_or_tzinfo
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if dt.tzinfo is not None:
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tzinfo = dt.tzinfo
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else:
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tzinfo = UTC
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else:
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dt = None
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tzinfo = dt_or_tzinfo
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locale = Locale.parse(locale)
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if hasattr(tzinfo, 'zone'):
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zone = tzinfo.zone
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else:
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zone = tzinfo.tzname(dt or datetime.utcnow())
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# Get the canonical time-zone code
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zone = get_global('zone_aliases').get(zone, zone)
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info = locale.time_zones.get(zone, {})
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# Otherwise, if there is only one timezone for the country, return the
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# localized country name
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region_format = locale.zone_formats['region']
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territory = get_global('zone_territories').get(zone)
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if territory not in locale.territories:
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territory = 'ZZ' # invalid/unknown
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territory_name = locale.territories[territory]
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if territory and len(get_global('territory_zones').get(territory, [])) == 1:
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return region_format % (territory_name)
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# Otherwise, include the city in the output
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fallback_format = locale.zone_formats['fallback']
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if 'city' in info:
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city_name = info['city']
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else:
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metazone = get_global('meta_zones').get(zone)
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metazone_info = locale.meta_zones.get(metazone, {})
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if 'city' in metazone_info:
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city_name = metazone_info['city']
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elif '/' in zone:
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city_name = zone.split('/', 1)[1].replace('_', ' ')
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else:
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city_name = zone.replace('_', ' ')
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return region_format % (fallback_format % {
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'0': city_name,
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'1': territory_name
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})
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def get_timezone_name(dt_or_tzinfo=None, width='long', uncommon=False,
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locale=LC_TIME, zone_variant=None):
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r"""Return the localized display name for the given timezone. The timezone
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may be specified using a ``datetime`` or `tzinfo` object.
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>>> dt = time(15, 30, tzinfo=get_timezone('America/Los_Angeles'))
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>>> get_timezone_name(dt, locale='en_US')
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u'Pacific Standard Time'
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>>> get_timezone_name(dt, width='short', locale='en_US')
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u'PST'
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If this function gets passed only a `tzinfo` object and no concrete
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`datetime`, the returned display name is indenpendent of daylight savings
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time. This can be used for example for selecting timezones, or to set the
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time of events that recur across DST changes:
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>>> tz = get_timezone('America/Los_Angeles')
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>>> get_timezone_name(tz, locale='en_US')
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u'Pacific Time'
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>>> get_timezone_name(tz, 'short', locale='en_US')
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u'PT'
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If no localized display name for the timezone is available, and the timezone
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is associated with a country that uses only a single timezone, the name of
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that country is returned, formatted according to the locale:
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|
|
|
>>> tz = get_timezone('Europe/Berlin')
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>>> get_timezone_name(tz, locale='de_DE')
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u'Mitteleurop\xe4ische Zeit'
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>>> get_timezone_name(tz, locale='pt_BR')
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u'Hor\xe1rio da Europa Central'
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On the other hand, if the country uses multiple timezones, the city is also
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included in the representation:
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|
>>> tz = get_timezone('America/St_Johns')
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>>> get_timezone_name(tz, locale='de_DE')
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u'Neufundland-Zeit'
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|
Note that short format is currently not supported for all timezones and
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all locales. This is partially because not every timezone has a short
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code in every locale. In that case it currently falls back to the long
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format.
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For more information see `LDML Appendix J: Time Zone Display Names
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|
<http://www.unicode.org/reports/tr35/#Time_Zone_Fallback>`_
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|
|
.. versionadded:: 0.9
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|
.. versionchanged:: 1.0
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|
Added `zone_variant` support.
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|
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|
:param dt_or_tzinfo: the ``datetime`` or ``tzinfo`` object that determines
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the timezone; if a ``tzinfo`` object is used, the
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resulting display name will be generic, i.e.
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independent of daylight savings time; if `None`, the
|
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current date in UTC is assumed
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:param width: either "long" or "short"
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|
:param uncommon: deprecated and ignored
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|
:param zone_variant: defines the zone variation to return. By default the
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variation is defined from the datetime object
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passed in. If no datetime object is passed in, the
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``'generic'`` variation is assumed. The following
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values are valid: ``'generic'``, ``'daylight'`` and
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``'standard'``.
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|
:param locale: the `Locale` object, or a locale string
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|
"""
|
|
if dt_or_tzinfo is None:
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dt = datetime.now()
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tzinfo = LOCALTZ
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elif isinstance(dt_or_tzinfo, string_types):
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dt = None
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tzinfo = get_timezone(dt_or_tzinfo)
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elif isinstance(dt_or_tzinfo, integer_types):
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dt = None
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tzinfo = UTC
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elif isinstance(dt_or_tzinfo, (datetime, time)):
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dt = dt_or_tzinfo
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if dt.tzinfo is not None:
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tzinfo = dt.tzinfo
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else:
|
|
tzinfo = UTC
|
|
else:
|
|
dt = None
|
|
tzinfo = dt_or_tzinfo
|
|
locale = Locale.parse(locale)
|
|
|
|
if hasattr(tzinfo, 'zone'):
|
|
zone = tzinfo.zone
|
|
else:
|
|
zone = tzinfo.tzname(dt)
|
|
|
|
if zone_variant is None:
|
|
if dt is None:
|
|
zone_variant = 'generic'
|
|
else:
|
|
dst = tzinfo.dst(dt)
|
|
if dst:
|
|
zone_variant = 'daylight'
|
|
else:
|
|
zone_variant = 'standard'
|
|
else:
|
|
if zone_variant not in ('generic', 'standard', 'daylight'):
|
|
raise ValueError('Invalid zone variation')
|
|
|
|
# Get the canonical time-zone code
|
|
zone = get_global('zone_aliases').get(zone, zone)
|
|
|
|
info = locale.time_zones.get(zone, {})
|
|
# Try explicitly translated zone names first
|
|
if width in info:
|
|
if zone_variant in info[width]:
|
|
return info[width][zone_variant]
|
|
|
|
metazone = get_global('meta_zones').get(zone)
|
|
if metazone:
|
|
metazone_info = locale.meta_zones.get(metazone, {})
|
|
if width in metazone_info:
|
|
if zone_variant in metazone_info[width]:
|
|
return metazone_info[width][zone_variant]
|
|
|
|
# If we have a concrete datetime, we assume that the result can't be
|
|
# independent of daylight savings time, so we return the GMT offset
|
|
if dt is not None:
|
|
return get_timezone_gmt(dt, width=width, locale=locale)
|
|
|
|
return get_timezone_location(dt_or_tzinfo, locale=locale)
|
|
|
|
|
|
def format_date(date=None, format='medium', locale=LC_TIME):
|
|
"""Return a date formatted according to the given pattern.
|
|
|
|
>>> d = date(2007, 04, 01)
|
|
>>> format_date(d, locale='en_US')
|
|
u'Apr 1, 2007'
|
|
>>> format_date(d, format='full', locale='de_DE')
|
|
u'Sonntag, 1. April 2007'
|
|
|
|
If you don't want to use the locale default formats, you can specify a
|
|
custom date pattern:
|
|
|
|
>>> format_date(d, "EEE, MMM d, ''yy", locale='en')
|
|
u"Sun, Apr 1, '07"
|
|
|
|
:param date: the ``date`` or ``datetime`` object; if `None`, the current
|
|
date is used
|
|
:param format: one of "full", "long", "medium", or "short", or a custom
|
|
date/time pattern
|
|
:param locale: a `Locale` object or a locale identifier
|
|
"""
|
|
if date is None:
|
|
date = date_.today()
|
|
elif isinstance(date, datetime):
|
|
date = date.date()
|
|
|
|
locale = Locale.parse(locale)
|
|
if format in ('full', 'long', 'medium', 'short'):
|
|
format = get_date_format(format, locale=locale)
|
|
pattern = parse_pattern(format)
|
|
return pattern.apply(date, locale)
|
|
|
|
|
|
def format_datetime(datetime=None, format='medium', tzinfo=None,
|
|
locale=LC_TIME):
|
|
r"""Return a date formatted according to the given pattern.
|
|
|
|
>>> dt = datetime(2007, 04, 01, 15, 30)
|
|
>>> format_datetime(dt, locale='en_US')
|
|
u'Apr 1, 2007, 3:30:00 PM'
|
|
|
|
For any pattern requiring the display of the time-zone, the third-party
|
|
``pytz`` package is needed to explicitly specify the time-zone:
|
|
|
|
>>> format_datetime(dt, 'full', tzinfo=get_timezone('Europe/Paris'),
|
|
... locale='fr_FR')
|
|
u'dimanche 1 avril 2007 17:30:00 heure avanc\xe9e d\u2019Europe centrale'
|
|
>>> format_datetime(dt, "yyyy.MM.dd G 'at' HH:mm:ss zzz",
|
|
... tzinfo=get_timezone('US/Eastern'), locale='en')
|
|
u'2007.04.01 AD at 11:30:00 EDT'
|
|
|
|
:param datetime: the `datetime` object; if `None`, the current date and
|
|
time is used
|
|
:param format: one of "full", "long", "medium", or "short", or a custom
|
|
date/time pattern
|
|
:param tzinfo: the timezone to apply to the time for display
|
|
:param locale: a `Locale` object or a locale identifier
|
|
"""
|
|
if datetime is None:
|
|
datetime = datetime_.utcnow()
|
|
elif isinstance(datetime, number_types):
|
|
datetime = datetime_.utcfromtimestamp(datetime)
|
|
elif isinstance(datetime, time):
|
|
datetime = datetime_.combine(date.today(), datetime)
|
|
if datetime.tzinfo is None:
|
|
datetime = datetime.replace(tzinfo=UTC)
|
|
if tzinfo is not None:
|
|
datetime = datetime.astimezone(get_timezone(tzinfo))
|
|
if hasattr(tzinfo, 'normalize'): # pytz
|
|
datetime = tzinfo.normalize(datetime)
|
|
|
|
locale = Locale.parse(locale)
|
|
if format in ('full', 'long', 'medium', 'short'):
|
|
return get_datetime_format(format, locale=locale) \
|
|
.replace("'", "") \
|
|
.replace('{0}', format_time(datetime, format, tzinfo=None,
|
|
locale=locale)) \
|
|
.replace('{1}', format_date(datetime, format, locale=locale))
|
|
else:
|
|
return parse_pattern(format).apply(datetime, locale)
|
|
|
|
|
|
def format_time(time=None, format='medium', tzinfo=None, locale=LC_TIME):
|
|
r"""Return a time formatted according to the given pattern.
|
|
|
|
>>> t = time(15, 30)
|
|
>>> format_time(t, locale='en_US')
|
|
u'3:30:00 PM'
|
|
>>> format_time(t, format='short', locale='de_DE')
|
|
u'15:30'
|
|
|
|
If you don't want to use the locale default formats, you can specify a
|
|
custom time pattern:
|
|
|
|
>>> format_time(t, "hh 'o''clock' a", locale='en')
|
|
u"03 o'clock PM"
|
|
|
|
For any pattern requiring the display of the time-zone a
|
|
timezone has to be specified explicitly:
|
|
|
|
>>> t = datetime(2007, 4, 1, 15, 30)
|
|
>>> tzinfo = get_timezone('Europe/Paris')
|
|
>>> t = tzinfo.localize(t)
|
|
>>> format_time(t, format='full', tzinfo=tzinfo, locale='fr_FR')
|
|
u'15:30:00 heure avanc\xe9e d\u2019Europe centrale'
|
|
>>> format_time(t, "hh 'o''clock' a, zzzz", tzinfo=get_timezone('US/Eastern'),
|
|
... locale='en')
|
|
u"09 o'clock AM, Eastern Daylight Time"
|
|
|
|
As that example shows, when this function gets passed a
|
|
``datetime.datetime`` value, the actual time in the formatted string is
|
|
adjusted to the timezone specified by the `tzinfo` parameter. If the
|
|
``datetime`` is "naive" (i.e. it has no associated timezone information),
|
|
it is assumed to be in UTC.
|
|
|
|
These timezone calculations are **not** performed if the value is of type
|
|
``datetime.time``, as without date information there's no way to determine
|
|
what a given time would translate to in a different timezone without
|
|
information about whether daylight savings time is in effect or not. This
|
|
means that time values are left as-is, and the value of the `tzinfo`
|
|
parameter is only used to display the timezone name if needed:
|
|
|
|
>>> t = time(15, 30)
|
|
>>> format_time(t, format='full', tzinfo=get_timezone('Europe/Paris'),
|
|
... locale='fr_FR')
|
|
u'15:30:00 heure normale de l\u2019Europe centrale'
|
|
>>> format_time(t, format='full', tzinfo=get_timezone('US/Eastern'),
|
|
... locale='en_US')
|
|
u'3:30:00 PM Eastern Standard Time'
|
|
|
|
:param time: the ``time`` or ``datetime`` object; if `None`, the current
|
|
time in UTC is used
|
|
:param format: one of "full", "long", "medium", or "short", or a custom
|
|
date/time pattern
|
|
:param tzinfo: the time-zone to apply to the time for display
|
|
:param locale: a `Locale` object or a locale identifier
|
|
"""
|
|
if time is None:
|
|
time = datetime.utcnow()
|
|
elif isinstance(time, number_types):
|
|
time = datetime.utcfromtimestamp(time)
|
|
if time.tzinfo is None:
|
|
time = time.replace(tzinfo=UTC)
|
|
if isinstance(time, datetime):
|
|
if tzinfo is not None:
|
|
time = time.astimezone(tzinfo)
|
|
if hasattr(tzinfo, 'normalize'): # pytz
|
|
time = tzinfo.normalize(time)
|
|
time = time.timetz()
|
|
elif tzinfo is not None:
|
|
time = time.replace(tzinfo=tzinfo)
|
|
|
|
locale = Locale.parse(locale)
|
|
if format in ('full', 'long', 'medium', 'short'):
|
|
format = get_time_format(format, locale=locale)
|
|
return parse_pattern(format).apply(time, locale)
|
|
|
|
|
|
TIMEDELTA_UNITS = (
|
|
('year', 3600 * 24 * 365),
|
|
('month', 3600 * 24 * 30),
|
|
('week', 3600 * 24 * 7),
|
|
('day', 3600 * 24),
|
|
('hour', 3600),
|
|
('minute', 60),
|
|
('second', 1)
|
|
)
|
|
|
|
|
|
def format_timedelta(delta, granularity='second', threshold=.85,
|
|
add_direction=False, format='medium',
|
|
locale=LC_TIME):
|
|
"""Return a time delta according to the rules of the given locale.
|
|
|
|
>>> format_timedelta(timedelta(weeks=12), locale='en_US')
|
|
u'3 months'
|
|
>>> format_timedelta(timedelta(seconds=1), locale='es')
|
|
u'1 segundo'
|
|
|
|
The granularity parameter can be provided to alter the lowest unit
|
|
presented, which defaults to a second.
|
|
|
|
>>> format_timedelta(timedelta(hours=3), granularity='day',
|
|
... locale='en_US')
|
|
u'1 day'
|
|
|
|
The threshold parameter can be used to determine at which value the
|
|
presentation switches to the next higher unit. A higher threshold factor
|
|
means the presentation will switch later. For example:
|
|
|
|
>>> format_timedelta(timedelta(hours=23), threshold=0.9, locale='en_US')
|
|
u'1 day'
|
|
>>> format_timedelta(timedelta(hours=23), threshold=1.1, locale='en_US')
|
|
u'23 hours'
|
|
|
|
In addition directional information can be provided that informs
|
|
the user if the date is in the past or in the future:
|
|
|
|
>>> format_timedelta(timedelta(hours=1), add_direction=True)
|
|
u'In 1 hour'
|
|
>>> format_timedelta(timedelta(hours=-1), add_direction=True)
|
|
u'1 hour ago'
|
|
|
|
:param delta: a ``timedelta`` object representing the time difference to
|
|
format, or the delta in seconds as an `int` value
|
|
:param granularity: determines the smallest unit that should be displayed,
|
|
the value can be one of "year", "month", "week", "day",
|
|
"hour", "minute" or "second"
|
|
:param threshold: factor that determines at which point the presentation
|
|
switches to the next higher unit
|
|
:param add_direction: if this flag is set to `True` the return value will
|
|
include directional information. For instance a
|
|
positive timedelta will include the information about
|
|
it being in the future, a negative will be information
|
|
about the value being in the past.
|
|
:param format: the format (currently only "medium" and "short" are supported)
|
|
:param locale: a `Locale` object or a locale identifier
|
|
"""
|
|
if format not in ('short', 'medium'):
|
|
raise TypeError('Format can only be one of "short" or "medium"')
|
|
if isinstance(delta, timedelta):
|
|
seconds = int((delta.days * 86400) + delta.seconds)
|
|
else:
|
|
seconds = delta
|
|
locale = Locale.parse(locale)
|
|
|
|
def _iter_choices(unit):
|
|
if add_direction:
|
|
if seconds >= 0:
|
|
yield unit + '-future'
|
|
else:
|
|
yield unit + '-past'
|
|
yield unit + ':' + format
|
|
yield unit
|
|
|
|
for unit, secs_per_unit in TIMEDELTA_UNITS:
|
|
value = abs(seconds) / secs_per_unit
|
|
if value >= threshold or unit == granularity:
|
|
if unit == granularity and value > 0:
|
|
value = max(1, value)
|
|
value = int(round(value))
|
|
plural_form = locale.plural_form(value)
|
|
pattern = None
|
|
for choice in _iter_choices(unit):
|
|
patterns = locale._data['unit_patterns'].get(choice)
|
|
if patterns is not None:
|
|
pattern = patterns[plural_form]
|
|
break
|
|
# This really should not happen
|
|
if pattern is None:
|
|
return u''
|
|
return pattern.replace('{0}', str(value))
|
|
|
|
return u''
|
|
|
|
|
|
def parse_date(string, locale=LC_TIME):
|
|
"""Parse a date from a string.
|
|
|
|
This function uses the date format for the locale as a hint to determine
|
|
the order in which the date fields appear in the string.
|
|
|
|
>>> parse_date('4/1/04', locale='en_US')
|
|
datetime.date(2004, 4, 1)
|
|
>>> parse_date('01.04.2004', locale='de_DE')
|
|
datetime.date(2004, 4, 1)
|
|
|
|
:param string: the string containing the date
|
|
:param locale: a `Locale` object or a locale identifier
|
|
"""
|
|
# TODO: try ISO format first?
|
|
format = get_date_format(locale=locale).pattern.lower()
|
|
year_idx = format.index('y')
|
|
month_idx = format.index('m')
|
|
if month_idx < 0:
|
|
month_idx = format.index('l')
|
|
day_idx = format.index('d')
|
|
|
|
indexes = [(year_idx, 'Y'), (month_idx, 'M'), (day_idx, 'D')]
|
|
indexes.sort()
|
|
indexes = dict([(item[1], idx) for idx, item in enumerate(indexes)])
|
|
|
|
# FIXME: this currently only supports numbers, but should also support month
|
|
# names, both in the requested locale, and english
|
|
|
|
numbers = re.findall('(\d+)', string)
|
|
year = numbers[indexes['Y']]
|
|
if len(year) == 2:
|
|
year = 2000 + int(year)
|
|
else:
|
|
year = int(year)
|
|
month = int(numbers[indexes['M']])
|
|
day = int(numbers[indexes['D']])
|
|
if month > 12:
|
|
month, day = day, month
|
|
return date(year, month, day)
|
|
|
|
|
|
def parse_time(string, locale=LC_TIME):
|
|
"""Parse a time from a string.
|
|
|
|
This function uses the time format for the locale as a hint to determine
|
|
the order in which the time fields appear in the string.
|
|
|
|
>>> parse_time('15:30:00', locale='en_US')
|
|
datetime.time(15, 30)
|
|
|
|
:param string: the string containing the time
|
|
:param locale: a `Locale` object or a locale identifier
|
|
:return: the parsed time
|
|
:rtype: `time`
|
|
"""
|
|
# TODO: try ISO format first?
|
|
format = get_time_format(locale=locale).pattern.lower()
|
|
hour_idx = format.index('h')
|
|
if hour_idx < 0:
|
|
hour_idx = format.index('k')
|
|
min_idx = format.index('m')
|
|
sec_idx = format.index('s')
|
|
|
|
indexes = [(hour_idx, 'H'), (min_idx, 'M'), (sec_idx, 'S')]
|
|
indexes.sort()
|
|
indexes = dict([(item[1], idx) for idx, item in enumerate(indexes)])
|
|
|
|
# FIXME: support 12 hour clock, and 0-based hour specification
|
|
# and seconds should be optional, maybe minutes too
|
|
# oh, and time-zones, of course
|
|
|
|
numbers = re.findall('(\d+)', string)
|
|
hour = int(numbers[indexes['H']])
|
|
minute = int(numbers[indexes['M']])
|
|
second = int(numbers[indexes['S']])
|
|
return time(hour, minute, second)
|
|
|
|
|
|
class DateTimePattern(object):
|
|
|
|
def __init__(self, pattern, format):
|
|
self.pattern = pattern
|
|
self.format = format
|
|
|
|
def __repr__(self):
|
|
return '<%s %r>' % (type(self).__name__, self.pattern)
|
|
|
|
def __unicode__(self):
|
|
return self.pattern
|
|
|
|
def __mod__(self, other):
|
|
if type(other) is not DateTimeFormat:
|
|
return NotImplemented
|
|
return self.format % other
|
|
|
|
def apply(self, datetime, locale):
|
|
return self % DateTimeFormat(datetime, locale)
|
|
|
|
|
|
class DateTimeFormat(object):
|
|
|
|
def __init__(self, value, locale):
|
|
assert isinstance(value, (date, datetime, time))
|
|
if isinstance(value, (datetime, time)) and value.tzinfo is None:
|
|
value = value.replace(tzinfo=UTC)
|
|
self.value = value
|
|
self.locale = Locale.parse(locale)
|
|
|
|
def __getitem__(self, name):
|
|
char = name[0]
|
|
num = len(name)
|
|
if char == 'G':
|
|
return self.format_era(char, num)
|
|
elif char in ('y', 'Y', 'u'):
|
|
return self.format_year(char, num)
|
|
elif char in ('Q', 'q'):
|
|
return self.format_quarter(char, num)
|
|
elif char in ('M', 'L'):
|
|
return self.format_month(char, num)
|
|
elif char in ('w', 'W'):
|
|
return self.format_week(char, num)
|
|
elif char == 'd':
|
|
return self.format(self.value.day, num)
|
|
elif char == 'D':
|
|
return self.format_day_of_year(num)
|
|
elif char == 'F':
|
|
return self.format_day_of_week_in_month()
|
|
elif char in ('E', 'e', 'c'):
|
|
return self.format_weekday(char, num)
|
|
elif char == 'a':
|
|
return self.format_period(char)
|
|
elif char == 'h':
|
|
if self.value.hour % 12 == 0:
|
|
return self.format(12, num)
|
|
else:
|
|
return self.format(self.value.hour % 12, num)
|
|
elif char == 'H':
|
|
return self.format(self.value.hour, num)
|
|
elif char == 'K':
|
|
return self.format(self.value.hour % 12, num)
|
|
elif char == 'k':
|
|
if self.value.hour == 0:
|
|
return self.format(24, num)
|
|
else:
|
|
return self.format(self.value.hour, num)
|
|
elif char == 'm':
|
|
return self.format(self.value.minute, num)
|
|
elif char == 's':
|
|
return self.format(self.value.second, num)
|
|
elif char == 'S':
|
|
return self.format_frac_seconds(num)
|
|
elif char == 'A':
|
|
return self.format_milliseconds_in_day(num)
|
|
elif char in ('z', 'Z', 'v', 'V'):
|
|
return self.format_timezone(char, num)
|
|
else:
|
|
raise KeyError('Unsupported date/time field %r' % char)
|
|
|
|
def format_era(self, char, num):
|
|
width = {3: 'abbreviated', 4: 'wide', 5: 'narrow'}[max(3, num)]
|
|
era = int(self.value.year >= 0)
|
|
return get_era_names(width, self.locale)[era]
|
|
|
|
def format_year(self, char, num):
|
|
value = self.value.year
|
|
if char.isupper():
|
|
week = self.get_week_number(self.get_day_of_year())
|
|
if week == 0:
|
|
value -= 1
|
|
year = self.format(value, num)
|
|
if num == 2:
|
|
year = year[-2:]
|
|
return year
|
|
|
|
def format_quarter(self, char, num):
|
|
quarter = (self.value.month - 1) // 3 + 1
|
|
if num <= 2:
|
|
return ('%%0%dd' % num) % quarter
|
|
width = {3: 'abbreviated', 4: 'wide', 5: 'narrow'}[num]
|
|
context = {'Q': 'format', 'q': 'stand-alone'}[char]
|
|
return get_quarter_names(width, context, self.locale)[quarter]
|
|
|
|
def format_month(self, char, num):
|
|
if num <= 2:
|
|
return ('%%0%dd' % num) % self.value.month
|
|
width = {3: 'abbreviated', 4: 'wide', 5: 'narrow'}[num]
|
|
context = {'M': 'format', 'L': 'stand-alone'}[char]
|
|
return get_month_names(width, context, self.locale)[self.value.month]
|
|
|
|
def format_week(self, char, num):
|
|
if char.islower(): # week of year
|
|
day_of_year = self.get_day_of_year()
|
|
week = self.get_week_number(day_of_year)
|
|
if week == 0:
|
|
date = self.value - timedelta(days=day_of_year)
|
|
week = self.get_week_number(self.get_day_of_year(date),
|
|
date.weekday())
|
|
return self.format(week, num)
|
|
else: # week of month
|
|
week = self.get_week_number(self.value.day)
|
|
if week == 0:
|
|
date = self.value - timedelta(days=self.value.day)
|
|
week = self.get_week_number(date.day, date.weekday())
|
|
pass
|
|
return '%d' % week
|
|
|
|
def format_weekday(self, char, num):
|
|
if num < 3:
|
|
if char.islower():
|
|
value = 7 - self.locale.first_week_day + self.value.weekday()
|
|
return self.format(value % 7 + 1, num)
|
|
num = 3
|
|
weekday = self.value.weekday()
|
|
width = {3: 'abbreviated', 4: 'wide', 5: 'narrow'}[num]
|
|
context = {3: 'format', 4: 'format', 5: 'stand-alone'}[num]
|
|
return get_day_names(width, context, self.locale)[weekday]
|
|
|
|
def format_day_of_year(self, num):
|
|
return self.format(self.get_day_of_year(), num)
|
|
|
|
def format_day_of_week_in_month(self):
|
|
return '%d' % ((self.value.day - 1) // 7 + 1)
|
|
|
|
def format_period(self, char):
|
|
period = {0: 'am', 1: 'pm'}[int(self.value.hour >= 12)]
|
|
return get_period_names(locale=self.locale)[period]
|
|
|
|
def format_frac_seconds(self, num):
|
|
value = str(self.value.microsecond)
|
|
return self.format(round(float('.%s' % value), num) * 10**num, num)
|
|
|
|
def format_milliseconds_in_day(self, num):
|
|
msecs = self.value.microsecond // 1000 + self.value.second * 1000 + \
|
|
self.value.minute * 60000 + self.value.hour * 3600000
|
|
return self.format(msecs, num)
|
|
|
|
def format_timezone(self, char, num):
|
|
width = {3: 'short', 4: 'long'}[max(3, num)]
|
|
if char == 'z':
|
|
return get_timezone_name(self.value, width, locale=self.locale)
|
|
elif char == 'Z':
|
|
return get_timezone_gmt(self.value, width, locale=self.locale)
|
|
elif char == 'v':
|
|
return get_timezone_name(self.value.tzinfo, width,
|
|
locale=self.locale)
|
|
elif char == 'V':
|
|
if num == 1:
|
|
return get_timezone_name(self.value.tzinfo, width,
|
|
uncommon=True, locale=self.locale)
|
|
return get_timezone_location(self.value.tzinfo, locale=self.locale)
|
|
|
|
def format(self, value, length):
|
|
return ('%%0%dd' % length) % value
|
|
|
|
def get_day_of_year(self, date=None):
|
|
if date is None:
|
|
date = self.value
|
|
return (date - date.replace(month=1, day=1)).days + 1
|
|
|
|
def get_week_number(self, day_of_period, day_of_week=None):
|
|
"""Return the number of the week of a day within a period. This may be
|
|
the week number in a year or the week number in a month.
|
|
|
|
Usually this will return a value equal to or greater than 1, but if the
|
|
first week of the period is so short that it actually counts as the last
|
|
week of the previous period, this function will return 0.
|
|
|
|
>>> format = DateTimeFormat(date(2006, 1, 8), Locale.parse('de_DE'))
|
|
>>> format.get_week_number(6)
|
|
1
|
|
|
|
>>> format = DateTimeFormat(date(2006, 1, 8), Locale.parse('en_US'))
|
|
>>> format.get_week_number(6)
|
|
2
|
|
|
|
:param day_of_period: the number of the day in the period (usually
|
|
either the day of month or the day of year)
|
|
:param day_of_week: the week day; if ommitted, the week day of the
|
|
current date is assumed
|
|
"""
|
|
if day_of_week is None:
|
|
day_of_week = self.value.weekday()
|
|
first_day = (day_of_week - self.locale.first_week_day -
|
|
day_of_period + 1) % 7
|
|
if first_day < 0:
|
|
first_day += 7
|
|
week_number = (day_of_period + first_day - 1) // 7
|
|
if 7 - first_day >= self.locale.min_week_days:
|
|
week_number += 1
|
|
return week_number
|
|
|
|
|
|
PATTERN_CHARS = {
|
|
'G': [1, 2, 3, 4, 5], # era
|
|
'y': None, 'Y': None, 'u': None, # year
|
|
'Q': [1, 2, 3, 4], 'q': [1, 2, 3, 4], # quarter
|
|
'M': [1, 2, 3, 4, 5], 'L': [1, 2, 3, 4, 5], # month
|
|
'w': [1, 2], 'W': [1], # week
|
|
'd': [1, 2], 'D': [1, 2, 3], 'F': [1], 'g': None, # day
|
|
'E': [1, 2, 3, 4, 5], 'e': [1, 2, 3, 4, 5], 'c': [1, 3, 4, 5], # week day
|
|
'a': [1], # period
|
|
'h': [1, 2], 'H': [1, 2], 'K': [1, 2], 'k': [1, 2], # hour
|
|
'm': [1, 2], # minute
|
|
's': [1, 2], 'S': None, 'A': None, # second
|
|
'z': [1, 2, 3, 4], 'Z': [1, 2, 3, 4], 'v': [1, 4], 'V': [1, 4] # zone
|
|
}
|
|
|
|
|
|
def parse_pattern(pattern):
|
|
"""Parse date, time, and datetime format patterns.
|
|
|
|
>>> parse_pattern("MMMMd").format
|
|
u'%(MMMM)s%(d)s'
|
|
>>> parse_pattern("MMM d, yyyy").format
|
|
u'%(MMM)s %(d)s, %(yyyy)s'
|
|
|
|
Pattern can contain literal strings in single quotes:
|
|
|
|
>>> parse_pattern("H:mm' Uhr 'z").format
|
|
u'%(H)s:%(mm)s Uhr %(z)s'
|
|
|
|
An actual single quote can be used by using two adjacent single quote
|
|
characters:
|
|
|
|
>>> parse_pattern("hh' o''clock'").format
|
|
u"%(hh)s o'clock"
|
|
|
|
:param pattern: the formatting pattern to parse
|
|
"""
|
|
if type(pattern) is DateTimePattern:
|
|
return pattern
|
|
|
|
result = []
|
|
quotebuf = None
|
|
charbuf = []
|
|
fieldchar = ['']
|
|
fieldnum = [0]
|
|
|
|
def append_chars():
|
|
result.append(''.join(charbuf).replace('%', '%%'))
|
|
del charbuf[:]
|
|
|
|
def append_field():
|
|
limit = PATTERN_CHARS[fieldchar[0]]
|
|
if limit and fieldnum[0] not in limit:
|
|
raise ValueError('Invalid length for field: %r'
|
|
% (fieldchar[0] * fieldnum[0]))
|
|
result.append('%%(%s)s' % (fieldchar[0] * fieldnum[0]))
|
|
fieldchar[0] = ''
|
|
fieldnum[0] = 0
|
|
|
|
for idx, char in enumerate(pattern.replace("''", '\0')):
|
|
if quotebuf is None:
|
|
if char == "'": # quote started
|
|
if fieldchar[0]:
|
|
append_field()
|
|
elif charbuf:
|
|
append_chars()
|
|
quotebuf = []
|
|
elif char in PATTERN_CHARS:
|
|
if charbuf:
|
|
append_chars()
|
|
if char == fieldchar[0]:
|
|
fieldnum[0] += 1
|
|
else:
|
|
if fieldchar[0]:
|
|
append_field()
|
|
fieldchar[0] = char
|
|
fieldnum[0] = 1
|
|
else:
|
|
if fieldchar[0]:
|
|
append_field()
|
|
charbuf.append(char)
|
|
|
|
elif quotebuf is not None:
|
|
if char == "'": # end of quote
|
|
charbuf.extend(quotebuf)
|
|
quotebuf = None
|
|
else: # inside quote
|
|
quotebuf.append(char)
|
|
|
|
if fieldchar[0]:
|
|
append_field()
|
|
elif charbuf:
|
|
append_chars()
|
|
|
|
return DateTimePattern(pattern, u''.join(result).replace('\0', "'"))
|