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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
# Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt
"""Checker mixin for deprecated functionality."""
from __future__ import annotations
from collections.abc import Container, Iterable
from itertools import chain
import astroid
from astroid import nodes
from pylint.checkers import utils
from pylint.checkers.base_checker import BaseChecker
from pylint.checkers.utils import get_import_name, infer_all, safe_infer
from pylint.typing import MessageDefinitionTuple
ACCEPTABLE_NODES = (
astroid.BoundMethod,
astroid.UnboundMethod,
nodes.FunctionDef,
nodes.ClassDef,
)
class DeprecatedMixin(BaseChecker):
"""A mixin implementing logic for checking deprecated symbols.
A class implementing mixin must define "deprecated-method" Message.
"""
DEPRECATED_MODULE_MESSAGE: dict[str, MessageDefinitionTuple] = {
"W4901": (
"Deprecated module %r",
"deprecated-module",
"A module marked as deprecated is imported.",
{"old_names": [("W0402", "old-deprecated-module")], "shared": True},
),
}
DEPRECATED_METHOD_MESSAGE: dict[str, MessageDefinitionTuple] = {
"W4902": (
"Using deprecated method %s()",
"deprecated-method",
"The method is marked as deprecated and will be removed in the future.",
{"old_names": [("W1505", "old-deprecated-method")], "shared": True},
),
}
DEPRECATED_ARGUMENT_MESSAGE: dict[str, MessageDefinitionTuple] = {
"W4903": (
"Using deprecated argument %s of method %s()",
"deprecated-argument",
"The argument is marked as deprecated and will be removed in the future.",
{"old_names": [("W1511", "old-deprecated-argument")], "shared": True},
),
}
DEPRECATED_CLASS_MESSAGE: dict[str, MessageDefinitionTuple] = {
"W4904": (
"Using deprecated class %s of module %s",
"deprecated-class",
"The class is marked as deprecated and will be removed in the future.",
{"old_names": [("W1512", "old-deprecated-class")], "shared": True},
),
}
DEPRECATED_DECORATOR_MESSAGE: dict[str, MessageDefinitionTuple] = {
"W4905": (
"Using deprecated decorator %s()",
"deprecated-decorator",
"The decorator is marked as deprecated and will be removed in the future.",
{"old_names": [("W1513", "old-deprecated-decorator")], "shared": True},
),
}
@utils.only_required_for_messages(
"deprecated-method",
"deprecated-argument",
"deprecated-class",
)
def visit_call(self, node: nodes.Call) -> None:
"""Called when a :class:`nodes.Call` node is visited."""
self.check_deprecated_class_in_call(node)
for inferred in infer_all(node.func):
# Calling entry point for deprecation check logic.
self.check_deprecated_method(node, inferred)
@utils.only_required_for_messages(
"deprecated-module",
"deprecated-class",
)
def visit_import(self, node: nodes.Import) -> None:
"""Triggered when an import statement is seen."""
for name in (name for name, _ in node.names):
self.check_deprecated_module(node, name)
if "." in name:
# Checking deprecation for import module with class
mod_name, class_name = name.split(".", 1)
self.check_deprecated_class(node, mod_name, (class_name,))
def deprecated_decorators(self) -> Iterable[str]:
"""Callback returning the deprecated decorators.
Returns:
collections.abc.Container of deprecated decorator names.
"""
return ()
@utils.only_required_for_messages("deprecated-decorator")
def visit_decorators(self, node: nodes.Decorators) -> None:
"""Triggered when a decorator statement is seen."""
children = list(node.get_children())
if not children:
return
if isinstance(children[0], nodes.Call):
inf = safe_infer(children[0].func)
else:
inf = safe_infer(children[0])
qname = inf.qname() if inf else None
if qname in self.deprecated_decorators():
self.add_message("deprecated-decorator", node=node, args=qname)
@utils.only_required_for_messages(
"deprecated-module",
"deprecated-class",
)
def visit_importfrom(self, node: nodes.ImportFrom) -> None:
"""Triggered when a from statement is seen."""
basename = node.modname
basename = get_import_name(node, basename)
self.check_deprecated_module(node, basename)
class_names = (name for name, _ in node.names)
self.check_deprecated_class(node, basename, class_names)
def deprecated_methods(self) -> Container[str]:
"""Callback returning the deprecated methods/functions.
Returns:
collections.abc.Container of deprecated function/method names.
"""
return ()
def deprecated_arguments(self, method: str) -> Iterable[tuple[int | None, str]]:
"""Callback returning the deprecated arguments of method/function.
Args:
method (str): name of function/method checked for deprecated arguments
Returns:
collections.abc.Iterable in form:
((POSITION1, PARAM1), (POSITION2: PARAM2) ...)
where
* POSITIONX - position of deprecated argument PARAMX in function definition.
If argument is keyword-only, POSITIONX should be None.
* PARAMX - name of the deprecated argument.
E.g. suppose function:
.. code-block:: python
def bar(arg1, arg2, arg3, arg4, arg5='spam')
with deprecated arguments `arg2` and `arg4`. `deprecated_arguments` should return:
.. code-block:: python
((1, 'arg2'), (3, 'arg4'))
"""
# pylint: disable=unused-argument
return ()
def deprecated_modules(self) -> Iterable[str]:
"""Callback returning the deprecated modules.
Returns:
collections.abc.Container of deprecated module names.
"""
return ()
def deprecated_classes(self, module: str) -> Iterable[str]:
"""Callback returning the deprecated classes of module.
Args:
module (str): name of module checked for deprecated classes
Returns:
collections.abc.Container of deprecated class names.
"""
# pylint: disable=unused-argument
return ()
def check_deprecated_module(self, node: nodes.Import, mod_path: str | None) -> None:
"""Checks if the module is deprecated."""
for mod_name in self.deprecated_modules():
if mod_path == mod_name or mod_path and mod_path.startswith(mod_name + "."):
self.add_message("deprecated-module", node=node, args=mod_path)
def check_deprecated_method(self, node: nodes.Call, inferred: nodes.NodeNG) -> None:
"""Executes the checker for the given node.
This method should be called from the checker implementing this mixin.
"""
# Reject nodes which aren't of interest to us.
if not isinstance(inferred, ACCEPTABLE_NODES):
return
if isinstance(node.func, nodes.Attribute):
func_name = node.func.attrname
elif isinstance(node.func, nodes.Name):
func_name = node.func.name
else:
# Not interested in other nodes.
return
qnames = {inferred.qname(), func_name}
if any(name in self.deprecated_methods() for name in qnames):
self.add_message("deprecated-method", node=node, args=(func_name,))
return
num_of_args = len(node.args)
kwargs = {kw.arg for kw in node.keywords} if node.keywords else {}
deprecated_arguments = (self.deprecated_arguments(qn) for qn in qnames)
for position, arg_name in chain(*deprecated_arguments):
if arg_name in kwargs:
# function was called with deprecated argument as keyword argument
self.add_message(
"deprecated-argument", node=node, args=(arg_name, func_name)
)
elif position is not None and position < num_of_args:
# function was called with deprecated argument as positional argument
self.add_message(
"deprecated-argument", node=node, args=(arg_name, func_name)
)
def check_deprecated_class(
self, node: nodes.NodeNG, mod_name: str, class_names: Iterable[str]
) -> None:
"""Checks if the class is deprecated."""
for class_name in class_names:
if class_name in self.deprecated_classes(mod_name):
self.add_message(
"deprecated-class", node=node, args=(class_name, mod_name)
)
def check_deprecated_class_in_call(self, node: nodes.Call) -> None:
"""Checks if call the deprecated class."""
if isinstance(node.func, nodes.Attribute) and isinstance(
node.func.expr, nodes.Name
):
mod_name = node.func.expr.name
class_name = node.func.attrname
self.check_deprecated_class(node, mod_name, (class_name,))