# Copyright 2020 - 2021 MONAI Consortium
# 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.
import inspect
import warnings
from functools import wraps
from types import FunctionType
from typing import Optional
from monai.utils.module import version_leq
from .. import __version__
__all__ = ["deprecated", "deprecated_arg", "DeprecatedError"]
[docs]class DeprecatedError(Exception):
pass
def warn_deprecated(obj, msg):
"""
Issue the warning message `msg`.
"""
warnings.warn(msg, category=DeprecationWarning, stacklevel=2)
[docs]def deprecated(
since: Optional[str] = None, removed: Optional[str] = None, msg_suffix: str = "", version_val: str = __version__
):
"""
Marks a function or class as deprecated. If `since` is given this should be a version at or earlier than the
current version and states at what version of the definition was marked as deprecated. If `removed` is given
this can be any version and marks when the definition was removed.
When the decorated definition is called, that is when the function is called or the class instantiated,
a `DeprecationWarning` is issued if `since` is given and the current version is at or later than that given.
a `DeprecatedError` exception is instead raised if `removed` is given and the current version is at or later
than that, or if neither `since` nor `removed` is provided.
Args:
since: version at which the definition was marked deprecated but not removed.
removed: version at which the definition was removed and no longer usable.
msg_suffix: message appended to warning/exception detailing reasons for deprecation and what to use instead.
version_val: (used for testing) version to compare since and removed against, default is MONAI version.
Returns:
Decorated definition which warns or raises exception when used
"""
if since is not None and removed is not None and not version_leq(since, removed):
raise ValueError(f"since must be less or equal to removed, got since={since}, removed={removed}.")
is_not_yet_deprecated = since is not None and version_val != since and version_leq(version_val, since)
if is_not_yet_deprecated:
# smaller than `since`, do nothing
return lambda obj: obj
if since is None and removed is None:
# raise a DeprecatedError directly
is_removed = True
is_deprecated = True
else:
# compare the numbers
is_deprecated = since is not None and version_leq(since, version_val)
is_removed = removed is not None and version_leq(removed, version_val)
def _decorator(obj):
is_func = isinstance(obj, FunctionType)
call_obj = obj if is_func else obj.__init__
msg_prefix = f"{'Function' if is_func else 'Class'} `{obj.__name__}`"
if is_removed:
msg_infix = f"was removed in version {removed}."
elif is_deprecated:
msg_infix = f"has been deprecated since version {since}."
if removed is not None:
msg_infix += f" It will be removed in version {removed}."
else:
msg_infix = "has been deprecated."
msg = f"{msg_prefix} {msg_infix} {msg_suffix}".strip()
@wraps(call_obj)
def _wrapper(*args, **kwargs):
if is_removed:
raise DeprecatedError(msg)
if is_deprecated:
warn_deprecated(obj, msg)
return call_obj(*args, **kwargs)
if is_func:
return _wrapper
else:
obj.__init__ = _wrapper
return obj
return _decorator
[docs]def deprecated_arg(
name,
since: Optional[str] = None,
removed: Optional[str] = None,
msg_suffix: str = "",
version_val: str = __version__,
):
"""
Marks a particular named argument of a callable as deprecated. The same conditions for `since` and `removed` as
described in the `deprecated` decorator.
When the decorated definition is called, that is when the function is called or the class instantiated with args,
a `DeprecationWarning` is issued if `since` is given and the current version is at or later than that given.
a `DeprecatedError` exception is instead raised if `removed` is given and the current version is at or later
than that, or if neither `since` nor `removed` is provided.
Args:
name: name of position or keyword argument to mark as deprecated.
since: version at which the argument was marked deprecated but not removed.
removed: version at which the argument was removed and no longer usable.
msg_suffix: message appended to warning/exception detailing reasons for deprecation and what to use instead.
version_val: (used for testing) version to compare since and removed against, default is MONAI version.
Returns:
Decorated callable which warns or raises exception when deprecated argument used
"""
if since is not None and removed is not None and not version_leq(since, removed):
raise ValueError(f"since must be less or equal to removed, got since={since}, removed={removed}.")
is_not_yet_deprecated = since is not None and version_val != since and version_leq(version_val, since)
if is_not_yet_deprecated:
# smaller than `since`, do nothing
return lambda obj: obj
if since is None and removed is None:
# raise a DeprecatedError directly
is_removed = True
is_deprecated = True
else:
# compare the numbers
is_deprecated = since is not None and version_leq(since, version_val)
is_removed = removed is not None and version_leq(removed, version_val)
if is_not_yet_deprecated:
return lambda obj: obj
def _decorator(func):
argname = f"{func.__name__}_{name}"
msg_prefix = f"Argument `{name}`"
if is_removed:
msg_infix = f"was removed in version {removed}."
elif is_deprecated:
msg_infix = f"has been deprecated since version {since}."
if removed is not None:
msg_infix += f" It will be removed in version {removed}."
else:
msg_infix = "has been deprecated."
msg = f"{msg_prefix} {msg_infix} {msg_suffix}".strip()
sig = inspect.signature(func)
@wraps(func)
def _wrapper(*args, **kwargs):
binding = sig.bind(*args, **kwargs).arguments
positional_found = name in binding
kw_found = "kwargs" in binding and name in binding["kwargs"]
if positional_found or kw_found:
if is_removed:
raise DeprecatedError(msg)
if is_deprecated:
warn_deprecated(argname, msg)
return func(*args, **kwargs)
return _wrapper
return _decorator