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"""
Implements the :class:`ArrowFactory <arrow.factory.ArrowFactory>` class,
providing factory methods for common :class:`Arrow <arrow.arrow.Arrow>`
construction scenarios.
"""
import calendar
from datetime import date, datetime
from datetime import tzinfo as dt_tzinfo
from decimal import Decimal
from time import struct_time
from typing import Any, List, Optional, Tuple, Type, Union, overload
from dateutil import tz as dateutil_tz
from arrow import parser
from arrow.arrow import TZ_EXPR, Arrow
from arrow.constants import DEFAULT_LOCALE
from arrow.util import is_timestamp, iso_to_gregorian
class ArrowFactory:
"""A factory for generating :class:`Arrow <arrow.arrow.Arrow>` objects.
:param type: (optional) the :class:`Arrow <arrow.arrow.Arrow>`-based class to construct from.
Defaults to :class:`Arrow <arrow.arrow.Arrow>`.
"""
type: Type[Arrow]
def __init__(self, type: Type[Arrow] = Arrow) -> None:
self.type = type
@overload
def get(
self,
*,
locale: str = DEFAULT_LOCALE,
tzinfo: Optional[TZ_EXPR] = None,
normalize_whitespace: bool = False,
) -> Arrow:
... # pragma: no cover
@overload
def get(
self,
__obj: Union[
Arrow,
datetime,
date,
struct_time,
dt_tzinfo,
int,
float,
str,
Tuple[int, int, int],
],
*,
locale: str = DEFAULT_LOCALE,
tzinfo: Optional[TZ_EXPR] = None,
normalize_whitespace: bool = False,
) -> Arrow:
... # pragma: no cover
@overload
def get(
self,
__arg1: Union[datetime, date],
__arg2: TZ_EXPR,
*,
locale: str = DEFAULT_LOCALE,
tzinfo: Optional[TZ_EXPR] = None,
normalize_whitespace: bool = False,
) -> Arrow:
... # pragma: no cover
@overload
def get(
self,
__arg1: str,
__arg2: Union[str, List[str]],
*,
locale: str = DEFAULT_LOCALE,
tzinfo: Optional[TZ_EXPR] = None,
normalize_whitespace: bool = False,
) -> Arrow:
... # pragma: no cover
def get(self, *args: Any, **kwargs: Any) -> Arrow:
"""Returns an :class:`Arrow <arrow.arrow.Arrow>` object based on flexible inputs.
:param locale: (optional) a ``str`` specifying a locale for the parser. Defaults to 'en-us'.
:param tzinfo: (optional) a :ref:`timezone expression <tz-expr>` or tzinfo object.
Replaces the timezone unless using an input form that is explicitly UTC or specifies
the timezone in a positional argument. Defaults to UTC.
:param normalize_whitespace: (optional) a ``bool`` specifying whether or not to normalize
redundant whitespace (spaces, tabs, and newlines) in a datetime string before parsing.
Defaults to false.
Usage::
>>> import arrow
**No inputs** to get current UTC time::
>>> arrow.get()
<Arrow [2013-05-08T05:51:43.316458+00:00]>
**One** :class:`Arrow <arrow.arrow.Arrow>` object, to get a copy.
>>> arw = arrow.utcnow()
>>> arrow.get(arw)
<Arrow [2013-10-23T15:21:54.354846+00:00]>
**One** ``float`` or ``int``, convertible to a floating-point timestamp, to get
that timestamp in UTC::
>>> arrow.get(1367992474.293378)
<Arrow [2013-05-08T05:54:34.293378+00:00]>
>>> arrow.get(1367992474)
<Arrow [2013-05-08T05:54:34+00:00]>
**One** ISO 8601-formatted ``str``, to parse it::
>>> arrow.get('2013-09-29T01:26:43.830580')
<Arrow [2013-09-29T01:26:43.830580+00:00]>
**One** ISO 8601-formatted ``str``, in basic format, to parse it::
>>> arrow.get('20160413T133656.456289')
<Arrow [2016-04-13T13:36:56.456289+00:00]>
**One** ``tzinfo``, to get the current time **converted** to that timezone::
>>> arrow.get(tz.tzlocal())
<Arrow [2013-05-07T22:57:28.484717-07:00]>
**One** naive ``datetime``, to get that datetime in UTC::
>>> arrow.get(datetime(2013, 5, 5))
<Arrow [2013-05-05T00:00:00+00:00]>
**One** aware ``datetime``, to get that datetime::
>>> arrow.get(datetime(2013, 5, 5, tzinfo=tz.tzlocal()))
<Arrow [2013-05-05T00:00:00-07:00]>
**One** naive ``date``, to get that date in UTC::
>>> arrow.get(date(2013, 5, 5))
<Arrow [2013-05-05T00:00:00+00:00]>
**One** time.struct time::
>>> arrow.get(gmtime(0))
<Arrow [1970-01-01T00:00:00+00:00]>
**One** iso calendar ``tuple``, to get that week date in UTC::
>>> arrow.get((2013, 18, 7))
<Arrow [2013-05-05T00:00:00+00:00]>
**Two** arguments, a naive or aware ``datetime``, and a replacement
:ref:`timezone expression <tz-expr>`::
>>> arrow.get(datetime(2013, 5, 5), 'US/Pacific')
<Arrow [2013-05-05T00:00:00-07:00]>
**Two** arguments, a naive ``date``, and a replacement
:ref:`timezone expression <tz-expr>`::
>>> arrow.get(date(2013, 5, 5), 'US/Pacific')
<Arrow [2013-05-05T00:00:00-07:00]>
**Two** arguments, both ``str``, to parse the first according to the format of the second::
>>> arrow.get('2013-05-05 12:30:45 America/Chicago', 'YYYY-MM-DD HH:mm:ss ZZZ')
<Arrow [2013-05-05T12:30:45-05:00]>
**Two** arguments, first a ``str`` to parse and second a ``list`` of formats to try::
>>> arrow.get('2013-05-05 12:30:45', ['MM/DD/YYYY', 'YYYY-MM-DD HH:mm:ss'])
<Arrow [2013-05-05T12:30:45+00:00]>
**Three or more** arguments, as for the direct constructor of an ``Arrow`` object::
>>> arrow.get(2013, 5, 5, 12, 30, 45)
<Arrow [2013-05-05T12:30:45+00:00]>
"""
arg_count = len(args)
locale = kwargs.pop("locale", DEFAULT_LOCALE)
tz = kwargs.get("tzinfo", None)
normalize_whitespace = kwargs.pop("normalize_whitespace", False)
# if kwargs given, send to constructor unless only tzinfo provided
if len(kwargs) > 1:
arg_count = 3
# tzinfo kwarg is not provided
if len(kwargs) == 1 and tz is None:
arg_count = 3
# () -> now, @ tzinfo or utc
if arg_count == 0:
if isinstance(tz, str):
tz = parser.TzinfoParser.parse(tz)
return self.type.now(tzinfo=tz)
if isinstance(tz, dt_tzinfo):
return self.type.now(tzinfo=tz)
return self.type.utcnow()
if arg_count == 1:
arg = args[0]
if isinstance(arg, Decimal):
arg = float(arg)
# (None) -> raises an exception
if arg is None:
raise TypeError("Cannot parse argument of type None.")
# try (int, float) -> from timestamp @ tzinfo
elif not isinstance(arg, str) and is_timestamp(arg):
if tz is None:
# set to UTC by default
tz = dateutil_tz.tzutc()
return self.type.fromtimestamp(arg, tzinfo=tz)
# (Arrow) -> from the object's datetime @ tzinfo
elif isinstance(arg, Arrow):
return self.type.fromdatetime(arg.datetime, tzinfo=tz)
# (datetime) -> from datetime @ tzinfo
elif isinstance(arg, datetime):
return self.type.fromdatetime(arg, tzinfo=tz)
# (date) -> from date @ tzinfo
elif isinstance(arg, date):
return self.type.fromdate(arg, tzinfo=tz)
# (tzinfo) -> now @ tzinfo
elif isinstance(arg, dt_tzinfo):
return self.type.now(tzinfo=arg)
# (str) -> parse @ tzinfo
elif isinstance(arg, str):
dt = parser.DateTimeParser(locale).parse_iso(arg, normalize_whitespace)
return self.type.fromdatetime(dt, tzinfo=tz)
# (struct_time) -> from struct_time
elif isinstance(arg, struct_time):
return self.type.utcfromtimestamp(calendar.timegm(arg))
# (iso calendar) -> convert then from date @ tzinfo
elif isinstance(arg, tuple) and len(arg) == 3:
d = iso_to_gregorian(*arg)
return self.type.fromdate(d, tzinfo=tz)
else:
raise TypeError(f"Cannot parse single argument of type {type(arg)!r}.")
elif arg_count == 2:
arg_1, arg_2 = args[0], args[1]
if isinstance(arg_1, datetime):
# (datetime, tzinfo/str) -> fromdatetime @ tzinfo
if isinstance(arg_2, (dt_tzinfo, str)):
return self.type.fromdatetime(arg_1, tzinfo=arg_2)
else:
raise TypeError(
f"Cannot parse two arguments of types 'datetime', {type(arg_2)!r}."
)
elif isinstance(arg_1, date):
# (date, tzinfo/str) -> fromdate @ tzinfo
if isinstance(arg_2, (dt_tzinfo, str)):
return self.type.fromdate(arg_1, tzinfo=arg_2)
else:
raise TypeError(
f"Cannot parse two arguments of types 'date', {type(arg_2)!r}."
)
# (str, format) -> parse @ tzinfo
elif isinstance(arg_1, str) and isinstance(arg_2, (str, list)):
dt = parser.DateTimeParser(locale).parse(
args[0], args[1], normalize_whitespace
)
return self.type.fromdatetime(dt, tzinfo=tz)
else:
raise TypeError(
f"Cannot parse two arguments of types {type(arg_1)!r} and {type(arg_2)!r}."
)
# 3+ args -> datetime-like via constructor
else:
return self.type(*args, **kwargs)
def utcnow(self) -> Arrow:
"""Returns an :class:`Arrow <arrow.arrow.Arrow>` object, representing "now" in UTC time.
Usage::
>>> import arrow
>>> arrow.utcnow()
<Arrow [2013-05-08T05:19:07.018993+00:00]>
"""
return self.type.utcnow()
def now(self, tz: Optional[TZ_EXPR] = None) -> Arrow:
"""Returns an :class:`Arrow <arrow.arrow.Arrow>` object, representing "now" in the given
timezone.
:param tz: (optional) A :ref:`timezone expression <tz-expr>`. Defaults to local time.
Usage::
>>> import arrow
>>> arrow.now()
<Arrow [2013-05-07T22:19:11.363410-07:00]>
>>> arrow.now('US/Pacific')
<Arrow [2013-05-07T22:19:15.251821-07:00]>
>>> arrow.now('+02:00')
<Arrow [2013-05-08T07:19:25.618646+02:00]>
>>> arrow.now('local')
<Arrow [2013-05-07T22:19:39.130059-07:00]>
"""
if tz is None:
tz = dateutil_tz.tzlocal()
elif not isinstance(tz, dt_tzinfo):
tz = parser.TzinfoParser.parse(tz)
return self.type.now(tz)
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