Source code for bokeh.core.property.struct

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

"""

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# Boilerplate
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from __future__ import annotations

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

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# Imports
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# Standard library imports
from typing import Any, Generic, TypeVar

# Bokeh imports
from .bases import ParameterizedProperty, Property

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# Globals and constants
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__all__ = (
    'Struct',
)

T = TypeVar("T")

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# General API
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class Optional(Generic[T]):

    def __init__(self, type_param: Property[T]):
        self.type_param = type_param

[docs]class Struct(ParameterizedProperty[T]): """ Accept values that are structures. """ _fields: dict[str, Property[Any]] _optional: set[str] def __init__(self, **fields) -> None: default = fields.pop("default", None) help = fields.pop("help", None) self._fields = {} self._optional = set() for name, type in fields.items(): if isinstance(type, Optional): self._optional.add(name) type = type.type_param self._fields[name] = self._validate_type_param(type, help_allowed=True) # XXX super().__init__(default=default, help=help) def __eq__(self, other: object) -> bool: if isinstance(other, self.__class__): return super().__eq__(other) and self._fields == other._fields and self._optional == other._optional else: return False @property def type_params(self): return list(self._fields.values()) def validate(self, value: Any, detail: bool = True): super().validate(value, detail) if isinstance(value, dict) and len(value) <= len(self._fields): for name, type in self._fields.items(): if name not in value: if name not in self._optional: break elif not type.is_valid(value[name]): break else: for name in value.keys(): if name not in self._fields: break else: return msg = "" if not detail else f"expected an element of {self}, got {value!r}" raise ValueError(msg) def __str__(self) -> str: class_name = self.__class__.__name__ fields = ", ".join(f"{name}={typ}" for name, typ in self._fields.items()) return f"{class_name}({fields})"
#----------------------------------------------------------------------------- # Dev API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Private API #----------------------------------------------------------------------------- #----------------------------------------------------------------------------- # Code #-----------------------------------------------------------------------------