/apps/external_apps/arcade/util.py
Python | 113 lines | 105 code | 1 blank | 7 comment | 0 complexity | 4d360afd79befa14bc829738fdf87311 MD5 | raw file
Possible License(s): BSD-3-Clause, GPL-2.0, BSD-2-Clause, Apache-2.0, AGPL-3.0
- """
- ISO8601 Date Parsing included from http://code.google.com/p/pyiso8601/
- """
- """ISO 8601 date time string parsing
- Basic usage:
- >>> import iso8601
- >>> iso8601.parse_date("2007-01-25T12:00:00Z")
- datetime.datetime(2007, 1, 25, 12, 0, tzinfo=<iso8601.iso8601.Utc ...>)
- >>>
- """
- from datetime import datetime, timedelta, tzinfo
- import re
- # Adapted from http://delete.me.uk/2005/03/iso8601.html
- ISO8601_REGEX = re.compile(r"(?P<year>[0-9]{4})(-(?P<month>[0-9]{1,2})(-(?P<day>[0-9]{1,2})"
- r"((?P<separator>.)(?P<hour>[0-9]{2}):(?P<minute>[0-9]{2})(:(?P<second>[0-9]{2})(\.(?P<fraction>[0-9]+))?)?"
- r"(?P<timezone>Z|(([-+])([0-9]{2}):([0-9]{2})))?)?)?)?"
- )
- TIMEZONE_REGEX = re.compile("(?P<prefix>[+-])(?P<hours>[0-9]{2}).(?P<minutes>[0-9]{2})")
- class ParseError(Exception):
- """Raised when there is a problem parsing a date string"""
- # Yoinked from python docs
- ZERO = timedelta(0)
- class Utc(tzinfo):
- """UTC
-
- """
- def utcoffset(self, dt):
- return ZERO
- def tzname(self, dt):
- return "UTC"
- def dst(self, dt):
- return ZERO
- UTC = Utc()
- class FixedOffset(tzinfo):
- """Fixed offset in hours and minutes from UTC
-
- """
- def __init__(self, offset_hours, offset_minutes, name):
- self.__offset = timedelta(hours=offset_hours, minutes=offset_minutes)
- self.__name = name
- def utcoffset(self, dt):
- return self.__offset
- def tzname(self, dt):
- return self.__name
- def dst(self, dt):
- return ZERO
-
- def __repr__(self):
- return "<FixedOffset %r>" % self.__name
- def parse_timezone(tzstring, default_timezone=UTC):
- """Parses ISO 8601 time zone specs into tzinfo offsets
-
- """
- if tzstring == "Z":
- return default_timezone
- # This isn't strictly correct, but it's common to encounter dates without
- # timezones so I'll assume the default (which defaults to UTC).
- # Addresses issue 4.
- if tzstring is None:
- return default_timezone
- m = TIMEZONE_REGEX.match(tzstring)
- prefix, hours, minutes = m.groups()
- hours, minutes = int(hours), int(minutes)
- if prefix == "-":
- hours = -hours
- minutes = -minutes
- return FixedOffset(hours, minutes, tzstring)
- def parse_date(datestring, default_timezone=UTC):
- """Parses ISO 8601 dates into datetime objects
-
- The timezone is parsed from the date string. However it is quite common to
- have dates without a timezone (not strictly correct). In this case the
- default timezone specified in default_timezone is used. This is UTC by
- default.
- """
- if not isinstance(datestring, basestring):
- raise ParseError("Expecting a string %r" % datestring)
- m = ISO8601_REGEX.match(datestring)
- if not m:
- raise ParseError("Unable to parse date string %r" % datestring)
- groups = m.groupdict()
- tz = parse_timezone(groups["timezone"], default_timezone=default_timezone)
- if groups["fraction"] is None:
- groups["fraction"] = 0
- else:
- groups["fraction"] = int(float("0.%s" % groups["fraction"]) * 1e6)
- return datetime(int(groups["year"]), int(groups["month"]), int(groups["day"]),
- int(groups["hour"]), int(groups["minute"]), int(groups["second"]),
- int(groups["fraction"]), tz)
-
- def iso8601(d):
- if isinstance(d, _datetime.date) and not isinstance(d, _datetime.datetime):
- return d.strftime('%Y-%m-%d')
- if d.tzinfo is None:
- d = _datetime.datetime(*_time.gmtime(_time.mktime(d.timetuple()))[:7])
- else:
- d = d.astimezone(_pytz.utc)
- return d.strftime('%Y-%m-%dT%H:%M:%SZ')