mirror of
https://fuchsia.googlesource.com/third_party/github.com/pylint-dev/pylint
synced 2024-09-21 16:19:21 +00:00
70 lines
2.6 KiB
Python
70 lines
2.6 KiB
Python
# Copyright 2012 Google Inc.
|
|
#
|
|
# http://www.logilab.fr/ -- mailto:contact@logilab.fr
|
|
# This program is free software; you can redistribute it and/or modify it under
|
|
# the terms of the GNU General Public License as published by the Free Software
|
|
# Foundation; either version 2 of the License, or (at your option) any later
|
|
# version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful, but WITHOUT
|
|
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details
|
|
#
|
|
# You should have received a copy of the GNU General Public License along with
|
|
# this program; if not, write to the Free Software Foundation, Inc.,
|
|
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
"""Checkers for various standard library functions."""
|
|
|
|
import re
|
|
import sys
|
|
|
|
import astroid
|
|
|
|
from pylint.interfaces import ITokenChecker, IAstroidChecker
|
|
from pylint.checkers import BaseChecker, BaseTokenChecker
|
|
from pylint.checkers import utils
|
|
|
|
_VALID_OPEN_MODE_REGEX = r'^(r?U|[rwa]\+?b?)$'
|
|
|
|
if sys.version_info >= (3, 0):
|
|
OPEN_MODULE = '_io'
|
|
else:
|
|
OPEN_MODULE = '__builtin__'
|
|
|
|
class OpenModeChecker(BaseChecker):
|
|
__implements__ = (IAstroidChecker,)
|
|
name = 'open_mode'
|
|
|
|
msgs = {
|
|
'W1501': ('"%s" is not a valid mode for open.',
|
|
'bad-open-mode',
|
|
'Python supports: r, w, a modes with b, +, and U options. '
|
|
'See http://docs.python.org/2/library/functions.html#open'),
|
|
}
|
|
|
|
@utils.check_messages('W1501')
|
|
def visit_callfunc(self, node):
|
|
"""Visit a CallFunc node."""
|
|
if hasattr(node, 'func'):
|
|
infer = utils.safe_infer(node.func)
|
|
if infer and infer.root().name == OPEN_MODULE:
|
|
if getattr(node.func, 'name', None) in ('open', 'file'):
|
|
self._check_open_mode(node)
|
|
|
|
def _check_open_mode(self, node):
|
|
"""Check that the mode argument of an open or file call is valid."""
|
|
try:
|
|
mode_arg = utils.get_argument_from_call(node, position=1, keyword='mode')
|
|
if mode_arg:
|
|
mode_arg = utils.safe_infer(mode_arg)
|
|
if (isinstance(mode_arg, astroid.Const)
|
|
and not re.match(_VALID_OPEN_MODE_REGEX, mode_arg.value)):
|
|
self.add_message('W1501', node=node, args=(mode_arg.value))
|
|
except (utils.NoSuchArgumentError, TypeError):
|
|
pass
|
|
|
|
def register(linter):
|
|
"""required method to auto register this checker """
|
|
linter.register_checker(OpenModeChecker(linter))
|
|
|