#-----------------------------------------------------------------------------
# Copyright (c) Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
#-----------------------------------------------------------------------------
""" Provide the numeric properties.
"""
#-----------------------------------------------------------------------------
# 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 .bases import (
Init,
Property,
SingleParameterizedProperty,
TypeOrInst,
)
from .primitive import Float, Int
from .singletons import Intrinsic, Undefined
#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------
__all__ = (
'Angle',
'Byte',
'Interval',
'NonNegative',
'Percent',
'Positive',
'Size',
)
T = TypeVar("T", bound=int | float)
#-----------------------------------------------------------------------------
# General API
#-----------------------------------------------------------------------------
[docs]
class NonNegative(SingleParameterizedProperty[T]):
""" A property accepting a value of some other type while having undefined default. """
def __init__(self, type_param: TypeOrInst[Property[T]], *, default: Init[T] = Intrinsic, help: str | None = None) -> None:
super().__init__(type_param, default=default, help=help)
def validate(self, value: Any, detail: bool = True) -> None:
super().validate(value, detail)
if not (0 <= value):
raise ValueError(f"expected a non-negative number, got {value!r}")
[docs]
class Positive(SingleParameterizedProperty[T]):
""" A property accepting a value of some other type while having undefined default. """
def __init__(self, type_param: TypeOrInst[Property[T]], *, default: Init[T] = Intrinsic, help: str | None = None) -> None:
super().__init__(type_param, default=default, help=help)
def validate(self, value: Any, detail: bool = True) -> None:
super().validate(value, detail)
if not (0 < value):
raise ValueError(f"expected a positive number, got {value!r}")
[docs]
class Interval(SingleParameterizedProperty[T]):
""" Accept numeric values that are contained within a given interval.
Args:
interval_type (numeric property):
numeric types for the range, e.g. ``Int``, ``Float``
start (number) :
A minimum allowable value for the range. Values less than
``start`` will result in validation errors.
end (number) :
A maximum allowable value for the range. Values greater than
``end`` will result in validation errors.
Example:
.. code-block:: python
>>> class RangeModel(HasProps):
... prop = Range(Float, 10, 20)
...
>>> m = RangeModel()
>>> m.prop = 10
>>> m.prop = 20
>>> m.prop = 15
>>> m.prop = 2 # ValueError !!
>>> m.prop = 22 # ValueError !!
>>> m.prop = "foo" # ValueError !!
"""
def __init__(self, type_param: TypeOrInst[Property[T]], start: T, end: T, *,
default: Init[T] = Undefined, help: str | None = None) -> None:
super().__init__(type_param, default=default, help=help)
self.type_param.validate(start)
self.type_param.validate(end)
self.start = start
self.end = end
def __str__(self) -> str:
class_name = self.__class__.__name__
return f"{class_name}({self.type_param}, {self.start!r}, {self.end!r})"
def validate(self, value: Any, detail: bool = True) -> None:
super().validate(value, detail)
if not (self.type_param.is_valid(value) and value >= self.start and value <= self.end):
msg = "" if not detail else f"expected a value of type {self.type_param} in range [{self.start}, {self.end}], got {value!r}"
raise ValueError(msg)
[docs]
class Byte(Interval[int]):
""" Accept integral byte values (0-255).
Example:
.. code-block:: python
>>> class ByteModel(HasProps):
... prop = Byte(default=0)
...
>>> m = ByteModel()
>>> m.prop = 255
>>> m.prop = 256 # ValueError !!
>>> m.prop = 10.3 # ValueError !!
"""
def __init__(self, default: Init[int] = 0, help: str | None = None) -> None:
super().__init__(Int, 0, 255, default=default, help=help)
[docs]
class Size(Float):
""" Accept non-negative numeric values.
Args:
default (float, optional) :
A default value for attributes created from this property to have.
help (str or None, optional) :
A documentation string for this property. It will be automatically
used by the :ref:`bokeh.sphinxext.bokeh_prop` extension when
generating Spinx documentation. (default: None)
Example:
.. code-block:: python
>>> class SizeModel(HasProps):
... prop = Size()
...
>>> m = SizeModel()
>>> m.prop = 0
>>> m.prop = 10e6
>>> m.prop = -10 # ValueError !!
>>> m.prop = "foo" # ValueError !!
"""
def validate(self, value: Any, detail: bool = True) -> None:
super().validate(value, detail)
if value < 0:
msg = "" if not detail else f"expected a non-negative number, got {value!r}"
raise ValueError(msg)
[docs]
class Percent(Float):
""" Accept floating point percentage values.
``Percent`` can be useful and semantically meaningful for specifying
things like alpha values and extents.
Args:
default (float, optional) :
A default value for attributes created from this property to have.
help (str or None, optional) :
A documentation string for this property. It will be automatically
used by the :ref:`bokeh.sphinxext.bokeh_prop` extension when
generating Spinx documentation. (default: None)
Example:
.. code-block:: python
>>> class PercentModel(HasProps):
... prop = Percent()
...
>>> m = PercentModel()
>>> m.prop = 0.0
>>> m.prop = 0.2
>>> m.prop = 1.0
>>> m.prop = -2 # ValueError !!
>>> m.prop = 5 # ValueError !!
"""
def validate(self, value: Any, detail: bool = True) -> None:
super().validate(value, detail)
if 0.0 <= value <= 1.0:
return
msg = "" if not detail else f"expected a value in range [0, 1], got {value!r}"
raise ValueError(msg)
[docs]
class Angle(Float):
""" Accept floating point angle values.
``Angle`` is equivalent to :class:`~bokeh.core.properties.Float` but is
provided for cases when it is more semantically meaningful.
Args:
default (float, optional) :
A default value for attributes created from this property to have.
help (str or None, optional) :
A documentation string for this property. It will be automatically
used by the :ref:`bokeh.sphinxext.bokeh_prop` extension when
generating Spinx documentation. (default: None)
"""
#-----------------------------------------------------------------------------
# Dev API
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Private API
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
