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    babel.dates
    ~~~~~~~~~~~

    Locale dependent formatting and parsing of dates and times.

    The default locale for the functions in this module is determined by the
    following environment variables, in that order:

     * ``LC_TIME``,
     * ``LC_ALL``, and
     * ``LANG``

    :copyright: (c) 2013 by the Babel Team.
    :license: BSD, see LICENSE for more details.
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    Dates are converted to naive datetimes with midnight as the time component.

    >>> _get_datetime(date(2015, 1, 1))
    datetime.datetime(2015, 1, 1, 0, 0)

    UNIX timestamps are converted to datetimes.

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    datetime.datetime(2014, 5, 13, 16, 53, 20)

    Other values are passed through as-is.

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    Transition information can only be provided for timezones returned by
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    :param zone: the timezone for which the transition should be looked up.
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    u'Tu'
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    u'mar.'
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    u'D'

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    >>> get_month_names('narrow', context='stand-alone', locale='de_DE')[1]
    u'J'

    :param width: the width to use, one of "wide", "abbreviated", or "narrow"
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    u'Q1'
    >>> get_quarter_names('narrow', locale='de_DE')[1]
    u'1'

    :param width: the width to use, one of "wide", "abbreviated", or "narrow"
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    <DateTimePattern u'EEEE, d. MMMM y'>

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    <DateTimePattern u'HH:mm:ss zzzz'>

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    >>> get_timezone_gmt(dt, locale='en', return_z=True)
    'Z'
    >>> get_timezone_gmt(dt, locale='en', width='iso8601_short')
    u'+00'
    >>> tz = get_timezone('America/Los_Angeles')
    >>> dt = tz.localize(datetime(2007, 4, 1, 15, 30))
    >>> get_timezone_gmt(dt, locale='en')
    u'GMT-07:00'
    >>> get_timezone_gmt(dt, 'short', locale='en')
    u'-0700'
    >>> get_timezone_gmt(dt, locale='en', width='iso8601_short')
    u'-07'

    The long format depends on the locale, for example in France the acronym
    UTC string is used instead of GMT:

    >>> get_timezone_gmt(dt, 'long', locale='fr_FR')
    u'UTC-07:00'

    .. versionadded:: 0.9

    :param datetime: the ``datetime`` object; if `None`, the current date and
                     time in UTC is used
    :param width: either "long" or "short" or "iso8601" or "iso8601_short"
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    The result depends on both the local display name of the country and the
    city associated with the time zone:

    >>> tz = get_timezone('America/St_Johns')
    >>> print(get_timezone_location(tz, locale='de_DE'))
    Kanada (St. John’s) Zeit
    >>> print(get_timezone_location(tz, locale='en'))
    Canada (St. John’s) Time
    >>> print(get_timezone_location(tz, locale='en', return_city=True))
    St. John’s
    >>> tz = get_timezone('America/Mexico_City')
    >>> get_timezone_location(tz, locale='de_DE')
    u'Mexiko (Mexiko-Stadt) Zeit'

    If the timezone is associated with a country that uses only a single
    timezone, just the localized country name is returned:

    >>> tz = get_timezone('Europe/Berlin')
    >>> get_timezone_name(tz, locale='de_DE')
    u'Mitteleurop\xe4ische Zeit'

    .. versionadded:: 0.9

    :param dt_or_tzinfo: the ``datetime`` or ``tzinfo`` object that determines
                         the timezone; if `None`, the current date and time in
                         UTC is assumed
    :param locale: the `Locale` object, or a locale string
    :param return_city: True or False, if True then return exemplar city (location)
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    >>> get_timezone_name(dt, locale='en_US')
    u'Pacific Standard Time'
    >>> get_timezone_name(dt, locale='en_US', return_zone=True)
    'America/Los_Angeles'
    >>> get_timezone_name(dt, width='short', locale='en_US')
    u'PST'

    If this function gets passed only a `tzinfo` object and no concrete
    `datetime`,  the returned display name is indenpendent of daylight savings
    time. This can be used for example for selecting timezones, or to set the
    time of events that recur across DST changes:

    >>> tz = get_timezone('America/Los_Angeles')
    >>> get_timezone_name(tz, locale='en_US')
    u'Pacific Time'
    >>> get_timezone_name(tz, 'short', locale='en_US')
    u'PT'

    If no localized display name for the timezone is available, and the timezone
    is associated with a country that uses only a single timezone, the name of
    that country is returned, formatted according to the locale:

    >>> tz = get_timezone('Europe/Berlin')
    >>> get_timezone_name(tz, locale='de_DE')
    u'Mitteleurop\xe4ische Zeit'
    >>> get_timezone_name(tz, locale='pt_BR')
    u'Hor\xe1rio da Europa Central'

    On the other hand, if the country uses multiple timezones, the city is also
    included in the representation:

    >>> tz = get_timezone('America/St_Johns')
    >>> get_timezone_name(tz, locale='de_DE')
    u'Neufundland-Zeit'

    Note that short format is currently not supported for all timezones and
    all locales.  This is partially because not every timezone has a short
    code in every locale.  In that case it currently falls back to the long
    format.

    For more information see `LDML Appendix J: Time Zone Display Names
    <http://www.unicode.org/reports/tr35/#Time_Zone_Fallback>`_

    .. versionadded:: 0.9

    .. versionchanged:: 1.0
       Added `zone_variant` support.

    :param dt_or_tzinfo: the ``datetime`` or ``tzinfo`` object that determines
                         the timezone; if a ``tzinfo`` object is used, the
                         resulting display name will be generic, i.e.
                         independent of daylight savings time; if `None`, the
                         current date in UTC is assumed
    :param width: either "long" or "short"
    :param uncommon: deprecated and ignored
    :param zone_variant: defines the zone variation to return.  By default the
                           variation is defined from the datetime object
                           passed in.  If no datetime object is passed in, the
                           ``'generic'`` variation is assumed.  The following
                           values are valid: ``'generic'``, ``'daylight'`` and
                           ``'standard'``.
    :param locale: the `Locale` object, or a locale string
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    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
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r�c	Csntt|�|�}t�|�}|dkrZt||d��dd��dt||d|d���dt|||d��St|��	||�SdS)	aReturn a date formatted according to the given pattern.

    >>> dt = datetime(2007, 4, 1, 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 \xe0 17:30:00 heure d\u2019\xe9t\xe9 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
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r�cCs8t||�}t�|�}|dkr(t||d�}t|��||�S)a@	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 d\u2019\xe9t\xe9 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.

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    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`
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    >>> t = time(15, 30)
    >>> format_time(t, format='full', tzinfo=get_timezone('Europe/Paris'),
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    u'15:30:00 heure normale d\u2019Europe centrale'
    >>> format_time(t, format='full', tzinfo=get_timezone('US/Eastern'),
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    u'3:30:00 PM Eastern Standard Time'

    :param time: the ``time`` or ``datetime`` object; if `None`, the current
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    and map to a suitable format for the given locale.

    >>> t = datetime(2007, 4, 1, 15, 30)
    >>> format_skeleton('MMMEd', t, locale='fr')
    u'dim. 1 avr.'
    >>> format_skeleton('MMMEd', t, locale='en')
    u'Sun, Apr 1'
    >>> format_skeleton('yMMd', t, locale='fi')  # yMMd is not in the Finnish locale; yMd gets used
    u'1.4.2007'
    >>> format_skeleton('yMMd', t, fuzzy=False, locale='fi')  # yMMd is not in the Finnish locale, an error is thrown
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                 time in UTC is used
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    u'1 segundo'

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    u'1 day'

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    >>> 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
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    >>> format_timedelta(timedelta(hours=1), add_direction=True, locale='en')
    u'in 1 hour'
    >>> format_timedelta(timedelta(hours=-1), add_direction=True, locale='en')
    u'1 hour ago'

    The format parameter controls how compact or wide the presentation is:

    >>> format_timedelta(timedelta(hours=3), format='short', locale='en')
    u'3 hr'
    >>> format_timedelta(timedelta(hours=3), format='narrow', locale='en')
    u'3h'

    :param delta: a ``timedelta`` object representing the time difference to
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    :param granularity: determines the smallest unit that should be displayed,
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    :param threshold: factor that determines at which point the presentation
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    >>> format_interval(time(12, 12), time(16, 16), "Hm", locale="en_GB")
    '12:12 – 16:16'

    >>> format_interval(time(5, 12), time(16, 16), "hm", locale="en_US")
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    >>> format_interval(time(16, 18), time(16, 24), "Hm", locale="it")
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    '16:18'

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    '2015/01/01～2017/01/01'

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    '16:18:00～16:24:00'

    >>> format_interval(date(2016, 1, 15), date(2016, 1, 17), "xxx", locale="de")
    '15.01.2016 – 17.01.2016'

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    Returns a list of (token_type, token_value) tuples.

    ``token_type`` may be either "chars" or "field".

    For "chars" tokens, the value is the literal value.

    For "field" tokens, the value is a tuple of (field character, repetition count).

    :param pattern: Pattern string
    :type pattern: str
    :rtype: list[tuple]
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    Turn a date format pattern token stream back into a string.

    This is the reverse operation of ``tokenize_pattern``.

    :type tokens: Iterable[tuple]
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    r�rr+rcss|]}|tkVqdS)N)r)r�Zchrrrr��sz%untokenize_pattern.<locals>.<genexpr>z'%s'r�z''r�)r�anyr"r�)�tokens�outputrrrrr�untokenize_patternts	r)cCsvt�}gg}xZt|�D]N\}}|dkrR|d|krD|�g�|��|�|d�|d�||f�qWdd�|D�S)u
    Split an interval-describing datetime pattern into multiple pieces.

    > The pattern is then designed to be broken up into two pieces by determining the first repeating field.
    - http://www.unicode.org/reports/tr35/tr35-dates.html#intervalFormats

    >>> split_interval_pattern(u'E d.M. – E d.M.')
    [u'E d.M. – ', 'E d.M.']
    >>> split_interval_pattern("Y 'text' Y 'more text'")
    ["Y 'text '", "Y 'more text'"]
    >>> split_interval_pattern(u"E, MMM d – E")
    [u'E, MMM d – ', u'E']
    >>> split_interval_pattern("MMM d")
    ['MMM d']
    >>> split_interval_pattern("y G")
    ['y G']
    >>> split_interval_pattern(u"MMM d – d")
    [u'MMM d – ', u'd']

    :param pattern: Interval pattern string
    :return: list of "subpatterns"
    r�r���cSsg|]}t|��qSr)r))r�r'rrrr��sz*split_interval_pattern.<locals>.<listcomp>)�setrr�clear�add)rcZseen_fields�partsrrrrr�split_interval_pattern�s
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    Find the closest match for the given datetime skeleton among the options given.

    This uses the rules outlined in the TR35 document.

    >>> match_skeleton('yMMd', ('yMd', 'yMMMd'))
    'yMd'

    >>> match_skeleton('yMMd', ('jyMMd',), allow_different_fields=True)
    'jyMMd'

    >>> match_skeleton('yMMd', ('qyMMd',), allow_different_fields=False)

    >>> match_skeleton('hmz', ('hmv',))
    'hmv'

    :param skeleton: The skeleton to match
    :type skeleton: str
    :param options: An iterable of other skeletons to match against
    :type options: Iterable[str]
    :return: The closest skeleton match, or if no match was found, None.
    :rtype: str|None
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