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# -*- coding: utf-8 -*-
from __future__ import absolute_import

import calendar
import re
from dateutil import tz as dateutil_tz
from arrow import util, locales


class DateTimeFormatter(object):

    _FORMAT_RE = re.compile('(YYY?Y?|MM?M?M?|Do|DD?D?D?|d?dd?d?|HH?|hh?|mm?|ss?|SS?S?S?S?S?|ZZ?|a|A|X)')

    def __init__(self, locale='en_us'):

        self.locale = locales.get_locale(locale)

    def format(cls, dt, fmt):

        return cls._FORMAT_RE.sub(lambda m: cls._format_token(dt, m.group(0)), fmt)

    def _format_token(self, dt, token):

        if token == 'YYYY':
            return self.locale.year_full(dt.year)
        if token == 'YY':
            return self.locale.year_abbreviation(dt.year)

        if token == 'MMMM':
            return self.locale.month_name(dt.month)
        if token == 'MMM':
            return self.locale.month_abbreviation(dt.month)
        if token == 'MM':
            return '{0:02d}'.format(dt.month)
        if token == 'M':
            return str(dt.month)

        if token == 'DDDD':
            return '{0:03d}'.format(dt.timetuple().tm_yday)
        if token == 'DDD':
            return str(dt.timetuple().tm_yday)
        if token == 'DD':
            return '{0:02d}'.format(dt.day)
        if token == 'D':
            return str(dt.day)

        if token == 'Do':
            return self.locale.ordinal_number(dt.day)

        if token == 'dddd':
            return self.locale.day_name(dt.isoweekday())
        if token == 'ddd':
            return self.locale.day_abbreviation(dt.isoweekday())
        if token == 'd':
            return str(dt.isoweekday())

        if token == 'HH':
            return '{0:02d}'.format(dt.hour)
        if token == 'H':
            return str(dt.hour)
        if token == 'hh':
            return '{0:02d}'.format(dt.hour if 0 < dt.hour < 13 else abs(dt.hour - 12))
        if token == 'h':
            return str(dt.hour if 0 < dt.hour < 13 else abs(dt.hour - 12))

        if token == 'mm':
            return '{0:02d}'.format(dt.minute)
        if token == 'm':
            return str(dt.minute)

        if token == 'ss':
            return '{0:02d}'.format(dt.second)
        if token == 's':
            return str(dt.second)

        if token == 'SSSSSS':
            return str('{0:06d}'.format(int(dt.microsecond)))
        if token == 'SSSSS':
            return str('{0:05d}'.format(int(dt.microsecond / 10)))
        if token == 'SSSS':
            return str('{0:04d}'.format(int(dt.microsecond / 100)))
        if token == 'SSS':
            return str('{0:03d}'.format(int(dt.microsecond / 1000)))
        if token == 'SS':
            return str('{0:02d}'.format(int(dt.microsecond / 10000)))
        if token == 'S':
            return str(int(dt.microsecond / 100000))

        if token == 'X':
            return str(calendar.timegm(dt.utctimetuple()))

        if token in ['ZZ', 'Z']:
            separator = ':' if token == 'ZZ' else ''
            tz = dateutil_tz.tzutc() if dt.tzinfo is None else dt.tzinfo
            total_minutes = int(util.total_seconds(tz.utcoffset(dt)) / 60)

            sign = '+' if total_minutes > 0 else '-'
            total_minutes = abs(total_minutes)
            hour, minute = divmod(total_minutes, 60)

            return '{0}{1:02d}{2}{3:02d}'.format(sign, hour, separator, minute)

        if token in ('a', 'A'):
            return self.locale.meridian(dt.hour, token)


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