AlkantarClanX12
Your IP : 3.145.106.7
"""
Functions to parse datetime objects.
We're using regular expressions rather than time.strptime because:
- They provide both validation and parsing.
- They're more flexible for datetimes.
- The date/datetime/time constructors produce friendlier error messages.
Stolen from https://raw.githubusercontent.com/django/django/main/django/utils/dateparse.py at
9718fa2e8abe430c3526a9278dd976443d4ae3c6
Changed to:
* use standard python datetime types not django.utils.timezone
* raise ValueError when regex doesn't match rather than returning None
* support parsing unix timestamps for dates and datetimes
"""
import re
from datetime import date, datetime, time, timedelta, timezone
from typing import Dict, Optional, Type, Union
from pydantic.v1 import errors
date_expr = r'(?P<year>\d{4})-(?P<month>\d{1,2})-(?P<day>\d{1,2})'
time_expr = (
r'(?P<hour>\d{1,2}):(?P<minute>\d{1,2})'
r'(?::(?P<second>\d{1,2})(?:\.(?P<microsecond>\d{1,6})\d{0,6})?)?'
r'(?P<tzinfo>Z|[+-]\d{2}(?::?\d{2})?)?$'
)
date_re = re.compile(f'{date_expr}$')
time_re = re.compile(time_expr)
datetime_re = re.compile(f'{date_expr}[T ]{time_expr}')
standard_duration_re = re.compile(
r'^'
r'(?:(?P<days>-?\d+) (days?, )?)?'
r'((?:(?P<hours>-?\d+):)(?=\d+:\d+))?'
r'(?:(?P<minutes>-?\d+):)?'
r'(?P<seconds>-?\d+)'
r'(?:\.(?P<microseconds>\d{1,6})\d{0,6})?'
r'$'
)
# Support the sections of ISO 8601 date representation that are accepted by timedelta
iso8601_duration_re = re.compile(
r'^(?P<sign>[-+]?)'
r'P'
r'(?:(?P<days>\d+(.\d+)?)D)?'
r'(?:T'
r'(?:(?P<hours>\d+(.\d+)?)H)?'
r'(?:(?P<minutes>\d+(.\d+)?)M)?'
r'(?:(?P<seconds>\d+(.\d+)?)S)?'
r')?'
r'$'
)
EPOCH = datetime(1970, 1, 1)
# if greater than this, the number is in ms, if less than or equal it's in seconds
# (in seconds this is 11th October 2603, in ms it's 20th August 1970)
MS_WATERSHED = int(2e10)
# slightly more than datetime.max in ns - (datetime.max - EPOCH).total_seconds() * 1e9
MAX_NUMBER = int(3e20)
StrBytesIntFloat = Union[str, bytes, int, float]
def get_numeric(value: StrBytesIntFloat, native_expected_type: str) -> Union[None, int, float]:
if isinstance(value, (int, float)):
return value
try:
return float(value)
except ValueError:
return None
except TypeError:
raise TypeError(f'invalid type; expected {native_expected_type}, string, bytes, int or float')
def from_unix_seconds(seconds: Union[int, float]) -> datetime:
if seconds > MAX_NUMBER:
return datetime.max
elif seconds < -MAX_NUMBER:
return datetime.min
while abs(seconds) > MS_WATERSHED:
seconds /= 1000
dt = EPOCH + timedelta(seconds=seconds)
return dt.replace(tzinfo=timezone.utc)
def _parse_timezone(value: Optional[str], error: Type[Exception]) -> Union[None, int, timezone]:
if value == 'Z':
return timezone.utc
elif value is not None:
offset_mins = int(value[-2:]) if len(value) > 3 else 0
offset = 60 * int(value[1:3]) + offset_mins
if value[0] == '-':
offset = -offset
try:
return timezone(timedelta(minutes=offset))
except ValueError:
raise error()
else:
return None
def parse_date(value: Union[date, StrBytesIntFloat]) -> date:
"""
Parse a date/int/float/string and return a datetime.date.
Raise ValueError if the input is well formatted but not a valid date.
Raise ValueError if the input isn't well formatted.
"""
if isinstance(value, date):
if isinstance(value, datetime):
return value.date()
else:
return value
number = get_numeric(value, 'date')
if number is not None:
return from_unix_seconds(number).date()
if isinstance(value, bytes):
value = value.decode()
match = date_re.match(value) # type: ignore
if match is None:
raise errors.DateError()
kw = {k: int(v) for k, v in match.groupdict().items()}
try:
return date(**kw)
except ValueError:
raise errors.DateError()
def parse_time(value: Union[time, StrBytesIntFloat]) -> time:
"""
Parse a time/string and return a datetime.time.
Raise ValueError if the input is well formatted but not a valid time.
Raise ValueError if the input isn't well formatted, in particular if it contains an offset.
"""
if isinstance(value, time):
return value
number = get_numeric(value, 'time')
if number is not None:
if number >= 86400:
# doesn't make sense since the time time loop back around to 0
raise errors.TimeError()
return (datetime.min + timedelta(seconds=number)).time()
if isinstance(value, bytes):
value = value.decode()
match = time_re.match(value) # type: ignore
if match is None:
raise errors.TimeError()
kw = match.groupdict()
if kw['microsecond']:
kw['microsecond'] = kw['microsecond'].ljust(6, '0')
tzinfo = _parse_timezone(kw.pop('tzinfo'), errors.TimeError)
kw_: Dict[str, Union[None, int, timezone]] = {k: int(v) for k, v in kw.items() if v is not None}
kw_['tzinfo'] = tzinfo
try:
return time(**kw_) # type: ignore
except ValueError:
raise errors.TimeError()
def parse_datetime(value: Union[datetime, StrBytesIntFloat]) -> datetime:
"""
Parse a datetime/int/float/string and return a datetime.datetime.
This function supports time zone offsets. When the input contains one,
the output uses a timezone with a fixed offset from UTC.
Raise ValueError if the input is well formatted but not a valid datetime.
Raise ValueError if the input isn't well formatted.
"""
if isinstance(value, datetime):
return value
number = get_numeric(value, 'datetime')
if number is not None:
return from_unix_seconds(number)
if isinstance(value, bytes):
value = value.decode()
match = datetime_re.match(value) # type: ignore
if match is None:
raise errors.DateTimeError()
kw = match.groupdict()
if kw['microsecond']:
kw['microsecond'] = kw['microsecond'].ljust(6, '0')
tzinfo = _parse_timezone(kw.pop('tzinfo'), errors.DateTimeError)
kw_: Dict[str, Union[None, int, timezone]] = {k: int(v) for k, v in kw.items() if v is not None}
kw_['tzinfo'] = tzinfo
try:
return datetime(**kw_) # type: ignore
except ValueError:
raise errors.DateTimeError()
def parse_duration(value: StrBytesIntFloat) -> timedelta:
"""
Parse a duration int/float/string and return a datetime.timedelta.
The preferred format for durations in Django is '%d %H:%M:%S.%f'.
Also supports ISO 8601 representation.
"""
if isinstance(value, timedelta):
return value
if isinstance(value, (int, float)):
# below code requires a string
value = f'{value:f}'
elif isinstance(value, bytes):
value = value.decode()
try:
match = standard_duration_re.match(value) or iso8601_duration_re.match(value)
except TypeError:
raise TypeError('invalid type; expected timedelta, string, bytes, int or float')
if not match:
raise errors.DurationError()
kw = match.groupdict()
sign = -1 if kw.pop('sign', '+') == '-' else 1
if kw.get('microseconds'):
kw['microseconds'] = kw['microseconds'].ljust(6, '0')
if kw.get('seconds') and kw.get('microseconds') and kw['seconds'].startswith('-'):
kw['microseconds'] = '-' + kw['microseconds']
kw_ = {k: float(v) for k, v in kw.items() if v is not None}
return sign * timedelta(**kw_)