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# Copyright (c) 2006, 2008-2011, 2013-2014 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
# Copyright (c) 2012-2014 Google, Inc.
# Copyright (c) 2013-2018 Claudiu Popa <pcmanticore@gmail.com>
# Copyright (c) 2014 Michal Nowikowski <godfryd@gmail.com>
# Copyright (c) 2014 Brett Cannon <brett@python.org>
# Copyright (c) 2014 Arun Persaud <arun@nubati.net>
# Copyright (c) 2015 Ionel Cristian Maries <contact@ionelmc.ro>
# Copyright (c) 2016 Alexander Todorov <atodorov@otb.bg>
# Copyright (c) 2016 Jakub Wilk <jwilk@jwilk.net>
# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
# For details: https://github.com/PyCQA/pylint/blob/master/COPYING
"""check for new / old style related problems
"""
import sys
import astroid
from pylint.interfaces import IAstroidChecker
from pylint.checkers import BaseChecker
from pylint.checkers.utils import check_messages, node_frame_class, has_known_bases
MSGS = {
"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.",
),
"E1004": (
"Missing argument to super()",
"missing-super-argument",
"Used when the super builtin didn't receive an " "argument.",
{"maxversion": (3, 0)},
),
}
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
"""
__implements__ = (IAstroidChecker,)
# configuration section name
name = "newstyle"
# messages
msgs = MSGS
priority = -2
# configuration options
options = ()
@check_messages("bad-super-call", "missing-super-argument")
def visit_functiondef(self, node):
"""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(astroid.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, astroid.Attribute):
continue
call = expr.expr
# skip the test if using super
if not (
isinstance(call, astroid.Call)
and isinstance(call.func, astroid.Name)
and call.func.name == "super"
):
continue
if not klass.newstyle and has_known_bases(klass):
# super should not be used on an old style class
continue
else:
# super first arg should be the class
if not call.args:
if sys.version_info[0] == 3:
# unless Python 3
continue
else:
self.add_message("missing-super-argument", node=call)
continue
# calling super(type(self), self) can lead to recursion loop
# in derived classes
arg0 = call.args[0]
if (
isinstance(arg0, astroid.Call)
and isinstance(arg0.func, astroid.Name)
and arg0.func.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
if (
len(call.args) >= 2
and isinstance(call.args[1], astroid.Name)
and call.args[1].name == "self"
and isinstance(arg0, astroid.Attribute)
and arg0.attrname == "__class__"
):
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 klass is not supcls:
name = None
# if supcls is not Uninferable, then supcls was infered
# 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):
"""required method to auto register this checker """
linter.register_checker(NewStyleConflictChecker(linter))
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