Source code for bokeh.core.property.either

#-----------------------------------------------------------------------------
# Copyright (c) 2012 - 2022, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
#-----------------------------------------------------------------------------
""" Provide the Either property.

The Either property is used to construct properties that an accept any of
multiple possible types.

"""

#-----------------------------------------------------------------------------
# Boilerplate
#-----------------------------------------------------------------------------
from __future__ import annotations

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

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

# Standard library imports
from typing import Any, TypeVar

# Bokeh imports
from ...util.strings import nice_join
from ._sphinx import property_link, register_type_link, type_link
from .bases import (
    Init,
    ParameterizedProperty,
    Property,
    TypeOrInst,
)
from .singletons import Intrinsic

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

__all__ = (
    'Either',
)

T = TypeVar("T")

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

[docs]class Either(ParameterizedProperty[Any]): """ Accept values according to a sequence of other property types. Example: .. code-block:: python >>> class EitherModel(HasProps): ... prop = Either(Bool, Int, Auto) ... >>> m = EitherModel() >>> m.prop = True >>> m.prop = 10 >>> m.prop = "auto" >>> m.prop = 10.3 # ValueError !! >>> m.prop = "foo" # ValueError !! """ def __init__(self, type_param0: TypeOrInst[Property[Any]], *type_params: TypeOrInst[Property[Any]], default: Init[T] = Intrinsic, help: str | None = None) -> None: super().__init__(type_param0, *type_params, default=default, help=help) for tp in self.type_params: self.alternatives.extend(tp.alternatives) def transform(self, value: Any) -> Any: for param in self.type_params: try: return param.transform(value) except ValueError: pass raise ValueError(f"Could not transform {value!r}") def validate(self, value: Any, detail: bool = True) -> None: super().validate(value, detail) if any(param.is_valid(value) for param in self.type_params): return msg = "" if not detail else f"expected an element of either {nice_join([ str(param) for param in self.type_params ])}, got {value!r}" raise ValueError(msg) def wrap(self, value): for tp in self.type_params: value = tp.wrap(value) return value def replace(self, old: type[Property[Any]], new: Property[Any]) -> Property[Any]: if self.__class__ == old: return new else: params = [ type_param.replace(old, new) for type_param in self.type_params ] return Either(*params)
#----------------------------------------------------------------------------- # Dev API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Private API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Code #----------------------------------------------------------------------------- @register_type_link(Either) def _sphinx_type_link(obj: Either[Any]): subtypes = ", ".join(type_link(x) for x in obj.type_params) return f"{property_link(obj)}({subtypes})"