113 lines
3.9 KiB
Python
113 lines
3.9 KiB
Python
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
|
|
# For details: https://github.com/pylint-dev/pylint/blob/main/LICENSE
|
|
# Copyright (c) https://github.com/pylint-dev/pylint/blob/main/CONTRIBUTORS.txt
|
|
|
|
"""Check for new / old style related problems."""
|
|
|
|
from __future__ import annotations
|
|
|
|
from typing import TYPE_CHECKING
|
|
|
|
import astroid
|
|
from astroid import nodes
|
|
|
|
from pylint.checkers import BaseChecker
|
|
from pylint.checkers.utils import node_frame_class, only_required_for_messages
|
|
from pylint.typing import MessageDefinitionTuple
|
|
|
|
if TYPE_CHECKING:
|
|
from pylint.lint import PyLinter
|
|
|
|
MSGS: dict[str, MessageDefinitionTuple] = {
|
|
"E1003": (
|
|
"Bad first argument %r given to super()",
|
|
"bad-super-call",
|
|
"Used when another argument than the current class is given as "
|
|
"first argument of the super builtin.",
|
|
)
|
|
}
|
|
|
|
|
|
class NewStyleConflictChecker(BaseChecker):
|
|
"""Checks for usage of new style capabilities on old style classes and
|
|
other new/old styles conflicts problems.
|
|
|
|
* use of property, __slots__, super
|
|
* "super" usage
|
|
"""
|
|
|
|
# configuration section name
|
|
name = "newstyle"
|
|
# messages
|
|
msgs = MSGS
|
|
# configuration options
|
|
options = ()
|
|
|
|
@only_required_for_messages("bad-super-call")
|
|
def visit_functiondef(self, node: nodes.FunctionDef) -> None:
|
|
"""Check use of super."""
|
|
# ignore actual functions or method within a new style class
|
|
if not node.is_method():
|
|
return
|
|
klass = node.parent.frame()
|
|
for stmt in node.nodes_of_class(nodes.Call):
|
|
if node_frame_class(stmt) != node_frame_class(node):
|
|
# Don't look down in other scopes.
|
|
continue
|
|
|
|
expr = stmt.func
|
|
if not isinstance(expr, nodes.Attribute):
|
|
continue
|
|
|
|
match call := expr.expr:
|
|
case nodes.Call(func=nodes.Name(name="super"), args=[arg0, *_]):
|
|
pass
|
|
case _:
|
|
# skip the test if using super
|
|
# super first arg should not be the class
|
|
continue
|
|
|
|
# calling super(type(self), self) can lead to recursion loop
|
|
# in derived classes
|
|
match arg0:
|
|
case nodes.Call(func=nodes.Name(name="type")):
|
|
self.add_message("bad-super-call", node=call, args=("type",))
|
|
continue
|
|
|
|
# calling super(self.__class__, self) can lead to recursion loop
|
|
# in derived classes
|
|
match call.args:
|
|
case [
|
|
nodes.Attribute(attrname="__class__"),
|
|
nodes.Name(name="self"),
|
|
*_,
|
|
]:
|
|
self.add_message(
|
|
"bad-super-call", node=call, args=("self.__class__",)
|
|
)
|
|
continue
|
|
|
|
try:
|
|
supcls = call.args and next(call.args[0].infer(), None)
|
|
except astroid.InferenceError:
|
|
continue
|
|
|
|
# If the supcls is in the ancestors of klass super can be used to skip
|
|
# a step in the mro() and get a method from a higher parent
|
|
if klass is not supcls and all(i != supcls for i in klass.ancestors()):
|
|
name = None
|
|
# if supcls is not Uninferable, then supcls was inferred
|
|
# and use its name. Otherwise, try to look
|
|
# for call.args[0].name
|
|
if supcls:
|
|
name = supcls.name
|
|
elif call.args and hasattr(call.args[0], "name"):
|
|
name = call.args[0].name
|
|
if name:
|
|
self.add_message("bad-super-call", node=call, args=(name,))
|
|
|
|
visit_asyncfunctiondef = visit_functiondef
|
|
|
|
|
|
def register(linter: PyLinter) -> None:
|
|
linter.register_checker(NewStyleConflictChecker(linter))
|