# Copyright 2018-2022 Streamlit Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. from dataclasses import dataclass from datetime import datetime, date, time from textwrap import dedent from typing import Any, cast, List, Optional, Sequence, Tuple, TYPE_CHECKING, Union from dateutil import relativedelta from typing_extensions import TypeAlias from streamlit.runtime.scriptrunner import ScriptRunContext, get_script_run_ctx from streamlit.type_util import Key, to_key from streamlit.errors import StreamlitAPIException from streamlit.proto.DateInput_pb2 import DateInput as DateInputProto from streamlit.proto.TimeInput_pb2 import TimeInput as TimeInputProto from streamlit.runtime.state import ( register_widget, WidgetArgs, WidgetCallback, WidgetKwargs, ) from .form import current_form_id from .utils import check_callback_rules, check_session_state_rules if TYPE_CHECKING: from streamlit.delta_generator import DeltaGenerator TimeValue: TypeAlias = Union[time, datetime, None] SingleDateValue: TypeAlias = Union[date, datetime, None] DateValue: TypeAlias = Union[SingleDateValue, Sequence[SingleDateValue]] DateWidgetReturn: TypeAlias = Union[date, Tuple[()], Tuple[date], Tuple[date, date]] def _parse_date_value(value: DateValue) -> Tuple[List[date], bool]: parsed_dates: List[date] range_value: bool = False if value is None: # Set value default. parsed_dates = [datetime.now().date()] elif isinstance(value, datetime): parsed_dates = [value.date()] elif isinstance(value, date): parsed_dates = [value] elif isinstance(value, (list, tuple)): if not len(value) in (0, 1, 2): raise StreamlitAPIException( "DateInput value should either be an date/datetime or a list/tuple of " "0 - 2 date/datetime values" ) parsed_dates = [v.date() if isinstance(v, datetime) else v for v in value] range_value = True else: raise StreamlitAPIException( "DateInput value should either be an date/datetime or a list/tuple of " "0 - 2 date/datetime values" ) return parsed_dates, range_value def _parse_min_date( min_value: SingleDateValue, parsed_dates: Sequence[date], ) -> date: parsed_min_date: date if isinstance(min_value, datetime): parsed_min_date = min_value.date() elif isinstance(min_value, date): parsed_min_date = min_value elif min_value is None: if parsed_dates: parsed_min_date = parsed_dates[0] - relativedelta.relativedelta(years=10) else: parsed_min_date = date.today() - relativedelta.relativedelta(years=10) else: raise StreamlitAPIException( "DateInput min should either be a date/datetime or None" ) return parsed_min_date def _parse_max_date( max_value: SingleDateValue, parsed_dates: Sequence[date], ) -> date: parsed_max_date: date if isinstance(max_value, datetime): parsed_max_date = max_value.date() elif isinstance(max_value, date): parsed_max_date = max_value elif max_value is None: if parsed_dates: parsed_max_date = parsed_dates[-1] + relativedelta.relativedelta(years=10) else: parsed_max_date = date.today() + relativedelta.relativedelta(years=10) else: raise StreamlitAPIException( "DateInput max should either be a date/datetime or None" ) return parsed_max_date @dataclass(frozen=True) class _DateInputValues: value: Sequence[date] is_range: bool max: date min: date @classmethod def from_raw_values( cls, value: DateValue, min_value: SingleDateValue, max_value: SingleDateValue, ) -> "_DateInputValues": parsed_value, is_range = _parse_date_value(value=value) return cls( value=parsed_value, is_range=is_range, min=_parse_min_date( min_value=min_value, parsed_dates=parsed_value, ), max=_parse_max_date( max_value=max_value, parsed_dates=parsed_value, ), ) def __post_init__(self) -> None: if self.min > self.max: raise StreamlitAPIException( f"The `min_value`, set to {self.min}, shouldn't be larger " f"than the `max_value`, set to {self.max}." ) if self.value: start_value = self.value[0] end_value = self.value[-1] if (start_value < self.min) or (end_value > self.max): raise StreamlitAPIException( f"The default `value` of {self.value} " f"must lie between the `min_value` of {self.min} " f"and the `max_value` of {self.max}, inclusively." ) class TimeWidgetsMixin: def time_input( self, label: str, value: TimeValue = None, key: Optional[Key] = None, help: Optional[str] = None, on_change: Optional[WidgetCallback] = None, args: Optional[WidgetArgs] = None, kwargs: Optional[WidgetKwargs] = None, *, # keyword-only arguments: disabled: bool = False, ) -> time: """Display a time input widget. Parameters ---------- label : str A short label explaining to the user what this time input is for. value : datetime.time/datetime.datetime The value of this widget when it first renders. This will be cast to str internally. Defaults to the current time. key : str or int An optional string or integer to use as the unique key for the widget. If this is omitted, a key will be generated for the widget based on its content. Multiple widgets of the same type may not share the same key. help : str An optional tooltip that gets displayed next to the input. on_change : callable An optional callback invoked when this time_input's value changes. args : tuple An optional tuple of args to pass to the callback. kwargs : dict An optional dict of kwargs to pass to the callback. disabled : bool An optional boolean, which disables the time input if set to True. The default is False. This argument can only be supplied by keyword. Returns ------- datetime.time The current value of the time input widget. Example ------- >>> t = st.time_input('Set an alarm for', datetime.time(8, 45)) >>> st.write('Alarm is set for', t) .. output:: https://doc-time-input.streamlitapp.com/ height: 260px """ ctx = get_script_run_ctx() return self._time_input( label=label, value=value, key=key, help=help, on_change=on_change, args=args, kwargs=kwargs, disabled=disabled, ctx=ctx, ) def _time_input( self, label: str, value: Union[time, datetime, None] = None, key: Optional[Key] = None, help: Optional[str] = None, on_change: Optional[WidgetCallback] = None, args: Optional[WidgetArgs] = None, kwargs: Optional[WidgetKwargs] = None, *, # keyword-only arguments: disabled: bool = False, ctx: Optional[ScriptRunContext] = None, ) -> time: key = to_key(key) check_callback_rules(self.dg, on_change) check_session_state_rules(default_value=value, key=key) parsed_time: time if value is None: # Set value default. parsed_time = datetime.now().time().replace(second=0, microsecond=0) elif isinstance(value, datetime): parsed_time = value.time().replace(second=0, microsecond=0) elif isinstance(value, time): parsed_time = value else: raise StreamlitAPIException( "The type of value should be one of datetime, time or None" ) del value time_input_proto = TimeInputProto() time_input_proto.label = label time_input_proto.default = time.strftime(parsed_time, "%H:%M") time_input_proto.form_id = current_form_id(self.dg) if help is not None: time_input_proto.help = dedent(help) def deserialize_time_input( ui_value: Optional[str], widget_id: Any = "" ) -> time: return ( datetime.strptime(ui_value, "%H:%M").time() if ui_value is not None else parsed_time ) def serialize_time_input(v: Union[datetime, time]) -> str: if isinstance(v, datetime): v = v.time() return time.strftime(v, "%H:%M") widget_state = register_widget( "time_input", time_input_proto, user_key=key, on_change_handler=on_change, args=args, kwargs=kwargs, deserializer=deserialize_time_input, serializer=serialize_time_input, ctx=ctx, ) # This needs to be done after register_widget because we don't want # the following proto fields to affect a widget's ID. time_input_proto.disabled = disabled if widget_state.value_changed: time_input_proto.value = serialize_time_input(widget_state.value) time_input_proto.set_value = True self.dg._enqueue("time_input", time_input_proto) return widget_state.value def date_input( self, label: str, value: DateValue = None, min_value: SingleDateValue = None, max_value: SingleDateValue = None, key: Optional[Key] = None, help: Optional[str] = None, on_change: Optional[WidgetCallback] = None, args: Optional[WidgetArgs] = None, kwargs: Optional[WidgetKwargs] = None, *, # keyword-only arguments: disabled: bool = False, ) -> DateWidgetReturn: """Display a date input widget. Parameters ---------- label : str A short label explaining to the user what this date input is for. value : datetime.date or datetime.datetime or list/tuple of datetime.date or datetime.datetime or None The value of this widget when it first renders. If a list/tuple with 0 to 2 date/datetime values is provided, the datepicker will allow users to provide a range. Defaults to today as a single-date picker. min_value : datetime.date or datetime.datetime The minimum selectable date. If value is a date, defaults to value - 10 years. If value is the interval [start, end], defaults to start - 10 years. max_value : datetime.date or datetime.datetime The maximum selectable date. If value is a date, defaults to value + 10 years. If value is the interval [start, end], defaults to end + 10 years. key : str or int An optional string or integer to use as the unique key for the widget. If this is omitted, a key will be generated for the widget based on its content. Multiple widgets of the same type may not share the same key. help : str An optional tooltip that gets displayed next to the input. on_change : callable An optional callback invoked when this date_input's value changes. args : tuple An optional tuple of args to pass to the callback. kwargs : dict An optional dict of kwargs to pass to the callback. disabled : bool An optional boolean, which disables the date input if set to True. The default is False. This argument can only be supplied by keyword. Returns ------- datetime.date or a tuple with 0-2 dates The current value of the date input widget. Example ------- >>> d = st.date_input( ... "When\'s your birthday", ... datetime.date(2019, 7, 6)) >>> st.write('Your birthday is:', d) .. output:: https://doc-date-input.streamlitapp.com/ height: 260px """ ctx = get_script_run_ctx() return self._date_input( label=label, value=value, min_value=min_value, max_value=max_value, key=key, help=help, on_change=on_change, args=args, kwargs=kwargs, disabled=disabled, ctx=ctx, ) def _date_input( self, label: str, value: DateValue = None, min_value: SingleDateValue = None, max_value: SingleDateValue = None, key: Optional[Key] = None, help: Optional[str] = None, on_change: Optional[WidgetCallback] = None, args: Optional[WidgetArgs] = None, kwargs: Optional[WidgetKwargs] = None, *, # keyword-only arguments: disabled: bool = False, ctx: Optional[ScriptRunContext] = None, ) -> DateWidgetReturn: key = to_key(key) check_callback_rules(self.dg, on_change) check_session_state_rules(default_value=value, key=key) parsed_values = _DateInputValues.from_raw_values( value=value, min_value=min_value, max_value=max_value, ) del value, min_value, max_value date_input_proto = DateInputProto() date_input_proto.is_range = parsed_values.is_range if help is not None: date_input_proto.help = dedent(help) date_input_proto.label = label date_input_proto.default[:] = [ date.strftime(v, "%Y/%m/%d") for v in parsed_values.value ] date_input_proto.min = date.strftime(parsed_values.min, "%Y/%m/%d") date_input_proto.max = date.strftime(parsed_values.max, "%Y/%m/%d") date_input_proto.form_id = current_form_id(self.dg) def deserialize_date_input( ui_value: Any, widget_id: str = "", ) -> DateWidgetReturn: return_value: Sequence[date] if ui_value is not None: return_value = tuple( datetime.strptime(v, "%Y/%m/%d").date() for v in ui_value ) else: return_value = parsed_values.value if not parsed_values.is_range: return return_value[0] return cast(DateWidgetReturn, tuple(return_value)) def serialize_date_input(v: DateWidgetReturn) -> List[str]: to_serialize = list(v) if isinstance(v, (list, tuple)) else [v] return [date.strftime(v, "%Y/%m/%d") for v in to_serialize] widget_state = register_widget( "date_input", date_input_proto, user_key=key, on_change_handler=on_change, args=args, kwargs=kwargs, deserializer=deserialize_date_input, serializer=serialize_date_input, ctx=ctx, ) # This needs to be done after register_widget because we don't want # the following proto fields to affect a widget's ID. date_input_proto.disabled = disabled if widget_state.value_changed: date_input_proto.value[:] = serialize_date_input(widget_state.value) date_input_proto.set_value = True self.dg._enqueue("date_input", date_input_proto) return widget_state.value @property def dg(self) -> "DeltaGenerator": """Get our DeltaGenerator.""" return cast("DeltaGenerator", self)