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# Copyright (c) 2016 Claudiu Popa <pcmanticore@gmail.com>
# 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
"""Checker for deprecated builtins."""
import astroid
from pylint.checkers import BaseChecker
from pylint.checkers.utils import check_messages
from pylint.interfaces import IAstroidChecker
BAD_FUNCTIONS = ["map", "filter"]
# Some hints regarding the use of bad builtins.
BUILTIN_HINTS = {"map": "Using a list comprehension can be clearer."}
BUILTIN_HINTS["filter"] = BUILTIN_HINTS["map"]
class BadBuiltinChecker(BaseChecker):
__implements__ = (IAstroidChecker,)
name = "deprecated_builtins"
msgs = {
"W0141": (
"Used builtin function %s",
"bad-builtin",
"Used when a black listed builtin function is used (see the "
"bad-function option). Usual black listed 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",
},
),
)
@check_messages("bad-builtin")
def visit_call(self, node):
if isinstance(node.func, astroid.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() or name in node.root()):
if name in self.config.bad_functions:
hint = BUILTIN_HINTS.get(name)
if hint:
args = "%r. %s" % (name, hint)
else:
args = repr(name)
self.add_message("bad-builtin", node=node, args=args)
def register(linter):
"""Required method to auto register this checker.
:param linter: Main interface object for Pylint plugins
:type linter: Pylint object
"""
linter.register_checker(BadBuiltinChecker(linter))
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