Source code for bokeh.core.property.datetime

#-----------------------------------------------------------------------------
# Copyright (c) 2012 - 2021, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
#-----------------------------------------------------------------------------
""" Provide date and time related properties

"""

#-----------------------------------------------------------------------------
# Boilerplate
#-----------------------------------------------------------------------------
import logging # isort:skip
log = logging.getLogger(__name__)

#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------

# Standard library imports
import datetime

# External imports
import dateutil.parser

# Bokeh imports
from ...util.serialization import (
    convert_date_to_datetime,
    is_datetime_type,
    is_timedelta_type,
)
from .bases import Property
from .primitive import bokeh_integer_types
from .singletons import Undefined

#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------

__all__ = (
    'Date',
    'Datetime',
    'TimeDelta',
)

#-----------------------------------------------------------------------------
# General API
#-----------------------------------------------------------------------------

[docs]class Date(Property): """ Accept Date (but not DateTime) values. """ def transform(self, value): value = super().transform(value) if isinstance(value, str): value = dateutil.parser.parse(value).date().isoformat() elif isinstance(value, datetime.date): value = value.isoformat() return value def validate(self, value, detail=True): super().validate(value, detail) # datetime.datetime is datetime.date, exclude manually up front if isinstance(value, datetime.datetime): msg = "" if not detail else "Expected a date value, got a datetime.datetime" raise ValueError(msg) if isinstance(value, datetime.date): return try: dateutil.parser.parse(value).date().isoformat() except Exception: msg = "" if not detail else f"Expected an ISO date string, got {value!r}" raise ValueError(msg)
[docs]class Datetime(Property): """ Accept Datetime values. """ def __init__(self, default=Undefined, help=None): super().__init__(default=default, help=help) def transform(self, value): value = super().transform(value) if isinstance(value, str): value = dateutil.parser.parse(value) # Handled by serialization in protocol.py for now, except for Date if isinstance(value, datetime.date): value = convert_date_to_datetime(value) return value def validate(self, value, detail=True): super().validate(value, detail) if is_datetime_type(value): return if isinstance(value, datetime.date): return if Datetime.is_timestamp(value): return if isinstance(value, str): try: dateutil.parser.parse(value).date() return except Exception: pass msg = "" if not detail else f"Expected a date, datetime object, or timestamp, got {value!r}" raise ValueError(msg) def serialize_value(self, value): """ Change the value into a JSON serializable format. """ if isinstance(value, datetime.date): value = convert_date_to_datetime(value) return value @staticmethod def is_timestamp(value): return isinstance(value, (float,) + bokeh_integer_types) and not isinstance(value, bool)
[docs]class TimeDelta(Property): """ Accept TimeDelta values. """ def __init__(self, default=datetime.timedelta(), help=None): super().__init__(default=default, help=help) def transform(self, value): value = super().transform(value) return value # Handled by serialization in protocol.py for now def validate(self, value, detail=True): super().validate(value, detail) if is_timedelta_type(value): return msg = "" if not detail else f"Expected a timedelta instance, got {value!r}" raise ValueError(msg)
#----------------------------------------------------------------------------- # Dev API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Private API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Code #-----------------------------------------------------------------------------