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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 for deprecated builtins."""
from __future__ import annotations
from typing import TYPE_CHECKING
from astroid import nodes
from pylint.checkers import BaseChecker
from pylint.checkers.utils import only_required_for_messages
if TYPE_CHECKING:
from pylint.lint import PyLinter
BAD_FUNCTIONS = ["map", "filter"]
# Some hints regarding the use of bad builtins.
LIST_COMP_MSG = "Using a list comprehension can be clearer."
BUILTIN_HINTS = {"map": LIST_COMP_MSG, "filter": LIST_COMP_MSG}
class BadBuiltinChecker(BaseChecker):
name = "deprecated_builtins"
msgs = {
"W0141": (
"Used builtin function %s",
"bad-builtin",
"Used when a disallowed builtin function is used (see the "
"bad-function option). Usual disallowed functions are the ones "
"like map, or filter , where Python offers now some cleaner "
"alternative like list comprehension.",
)
}
options = (
(
"bad-functions",
{
"default": BAD_FUNCTIONS,
"type": "csv",
"metavar": "<builtin function names>",
"help": "List of builtins function names that should not be "
"used, separated by a comma",
},
),
)
@only_required_for_messages("bad-builtin")
def visit_call(self, node: nodes.Call) -> None:
if isinstance(node.func, nodes.Name):
name = node.func.name
# ignore the name if it's not a builtin (i.e. not defined in the
# locals nor globals scope)
if not (name in node.frame(future=True) or name in node.root()):
if name in self.linter.config.bad_functions:
hint = BUILTIN_HINTS.get(name)
args = f"{name!r}. {hint}" if hint else repr(name)
self.add_message("bad-builtin", node=node, args=args)
def register(linter: PyLinter) -> None:
linter.register_checker(BadBuiltinChecker(linter))