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authorbrenda-br2023-02-23 22:14:39 +0530
committerbrenda-br2023-02-23 22:14:39 +0530
commitd476d2e053f937c0060f696312f301591e4f43ea (patch)
tree5d1643ba487082f986d8cc1868fba482293f1e37 /venv/Lib/site-packages/pylint/checkers/stdlib.py
parentc5f533673ea9ab4315e76940f6d014e349f97884 (diff)
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-# -*- coding: utf-8 -*-
-# Copyright (c) 2013-2014 LOGILAB S.A. (Paris, FRANCE) <contact@logilab.fr>
-# Copyright (c) 2013-2014 Google, Inc.
-# Copyright (c) 2014-2018 Claudiu Popa <pcmanticore@gmail.com>
-# Copyright (c) 2014 Cosmin Poieana <cmin@ropython.org>
-# Copyright (c) 2014 Vlad Temian <vladtemian@gmail.com>
-# Copyright (c) 2014 Arun Persaud <arun@nubati.net>
-# Copyright (c) 2015 Cezar <celnazli@bitdefender.com>
-# Copyright (c) 2015 Chris Rebert <code@rebertia.com>
-# Copyright (c) 2015 Ionel Cristian Maries <contact@ionelmc.ro>
-# Copyright (c) 2016 Jared Garst <cultofjared@gmail.com>
-# Copyright (c) 2017 Renat Galimov <renat2017@gmail.com>
-# Copyright (c) 2017 Martin <MartinBasti@users.noreply.github.com>
-# Copyright (c) 2017 Christopher Zurcher <zurcher@users.noreply.github.com>
-# Copyright (c) 2017 Ɓukasz Rogalski <rogalski.91@gmail.com>
-# Copyright (c) 2018 Banjamin Freeman <befreeman@users.noreply.github.com>
-# Copyright (c) 2018 Ioana Tagirta <ioana.tagirta@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
-
-"""Checkers for various standard library functions."""
-
-import sys
-
-import astroid
-from astroid.bases import Instance
-from astroid.node_classes import Const
-
-from pylint.checkers import BaseChecker, utils
-from pylint.interfaces import IAstroidChecker
-
-OPEN_FILES = {"open", "file"}
-UNITTEST_CASE = "unittest.case"
-THREADING_THREAD = "threading.Thread"
-COPY_COPY = "copy.copy"
-OS_ENVIRON = "os._Environ"
-ENV_GETTERS = {"os.getenv"}
-SUBPROCESS_POPEN = "subprocess.Popen"
-SUBPROCESS_RUN = "subprocess.run"
-OPEN_MODULE = "_io"
-
-
-def _check_mode_str(mode):
- # check type
- if not isinstance(mode, str):
- return False
- # check syntax
- modes = set(mode)
- _mode = "rwatb+Ux"
- creating = "x" in modes
- if modes - set(_mode) or len(mode) > len(modes):
- return False
- # check logic
- reading = "r" in modes
- writing = "w" in modes
- appending = "a" in modes
- text = "t" in modes
- binary = "b" in modes
- if "U" in modes:
- if writing or appending or creating:
- return False
- reading = True
- if text and binary:
- return False
- total = reading + writing + appending + creating
- if total > 1:
- return False
- if not (reading or writing or appending or creating):
- return False
- return True
-
-
-class StdlibChecker(BaseChecker):
- __implements__ = (IAstroidChecker,)
- name = "stdlib"
-
- msgs = {
- "W1501": (
- '"%s" is not a valid mode for open.',
- "bad-open-mode",
- "Python supports: r, w, a[, x] modes with b, +, "
- "and U (only with r) options. "
- "See http://docs.python.org/2/library/functions.html#open",
- ),
- "W1502": (
- "Using datetime.time in a boolean context.",
- "boolean-datetime",
- "Using datetime.time in a boolean context can hide "
- "subtle bugs when the time they represent matches "
- "midnight UTC. This behaviour was fixed in Python 3.5. "
- "See http://bugs.python.org/issue13936 for reference.",
- {"maxversion": (3, 5)},
- ),
- "W1503": (
- "Redundant use of %s with constant value %r",
- "redundant-unittest-assert",
- "The first argument of assertTrue and assertFalse is "
- "a condition. If a constant is passed as parameter, that "
- "condition will be always true. In this case a warning "
- "should be emitted.",
- ),
- "W1505": (
- "Using deprecated method %s()",
- "deprecated-method",
- "The method is marked as deprecated and will be removed in "
- "a future version of Python. Consider looking for an "
- "alternative in the documentation.",
- ),
- "W1506": (
- "threading.Thread needs the target function",
- "bad-thread-instantiation",
- "The warning is emitted when a threading.Thread class "
- "is instantiated without the target function being passed. "
- "By default, the first parameter is the group param, not the target param. ",
- ),
- "W1507": (
- "Using copy.copy(os.environ). Use os.environ.copy() instead. ",
- "shallow-copy-environ",
- "os.environ is not a dict object but proxy object, so "
- "shallow copy has still effects on original object. "
- "See https://bugs.python.org/issue15373 for reference. ",
- ),
- "E1507": (
- "%s does not support %s type argument",
- "invalid-envvar-value",
- "Env manipulation functions support only string type arguments. "
- "See https://docs.python.org/3/library/os.html#os.getenv. ",
- ),
- "W1508": (
- "%s default type is %s. Expected str or None.",
- "invalid-envvar-default",
- "Env manipulation functions return None or str values. "
- "Supplying anything different as a default may cause bugs. "
- "See https://docs.python.org/3/library/os.html#os.getenv. ",
- ),
- "W1509": (
- "Using preexec_fn keyword which may be unsafe in the presence "
- "of threads",
- "subprocess-popen-preexec-fn",
- "The preexec_fn parameter is not safe to use in the presence "
- "of threads in your application. The child process could "
- "deadlock before exec is called. If you must use it, keep it "
- "trivial! Minimize the number of libraries you call into."
- "https://docs.python.org/3/library/subprocess.html#popen-constructor",
- ),
- "W1510": (
- "Using subprocess.run without explicitly set `check` is not recommended.",
- "subprocess-run-check",
- "The check parameter should always be used with explicitly set "
- "`check` keyword to make clear what the error-handling behavior is."
- "https://docs.python.org/3/library/subprocess.html#subprocess.runs",
- ),
- }
-
- deprecated = {
- 0: {
- "cgi.parse_qs",
- "cgi.parse_qsl",
- "ctypes.c_buffer",
- "distutils.command.register.register.check_metadata",
- "distutils.command.sdist.sdist.check_metadata",
- "tkinter.Misc.tk_menuBar",
- "tkinter.Menu.tk_bindForTraversal",
- },
- 2: {
- (2, 6, 0): {
- "commands.getstatus",
- "os.popen2",
- "os.popen3",
- "os.popen4",
- "macostools.touched",
- },
- (2, 7, 0): {
- "unittest.case.TestCase.assertEquals",
- "unittest.case.TestCase.assertNotEquals",
- "unittest.case.TestCase.assertAlmostEquals",
- "unittest.case.TestCase.assertNotAlmostEquals",
- "unittest.case.TestCase.assert_",
- "xml.etree.ElementTree.Element.getchildren",
- "xml.etree.ElementTree.Element.getiterator",
- "xml.etree.ElementTree.XMLParser.getiterator",
- "xml.etree.ElementTree.XMLParser.doctype",
- },
- },
- 3: {
- (3, 0, 0): {
- "inspect.getargspec",
- "failUnlessEqual",
- "assertEquals",
- "failIfEqual",
- "assertNotEquals",
- "failUnlessAlmostEqual",
- "assertAlmostEquals",
- "failIfAlmostEqual",
- "assertNotAlmostEquals",
- "failUnless",
- "assert_",
- "failUnlessRaises",
- "failIf",
- "assertRaisesRegexp",
- "assertRegexpMatches",
- "assertNotRegexpMatches",
- },
- (3, 1, 0): {
- "base64.encodestring",
- "base64.decodestring",
- "ntpath.splitunc",
- },
- (3, 2, 0): {
- "cgi.escape",
- "configparser.RawConfigParser.readfp",
- "xml.etree.ElementTree.Element.getchildren",
- "xml.etree.ElementTree.Element.getiterator",
- "xml.etree.ElementTree.XMLParser.getiterator",
- "xml.etree.ElementTree.XMLParser.doctype",
- },
- (3, 3, 0): {
- "inspect.getmoduleinfo",
- "logging.warn",
- "logging.Logger.warn",
- "logging.LoggerAdapter.warn",
- "nntplib._NNTPBase.xpath",
- "platform.popen",
- },
- (3, 4, 0): {
- "importlib.find_loader",
- "plistlib.readPlist",
- "plistlib.writePlist",
- "plistlib.readPlistFromBytes",
- "plistlib.writePlistToBytes",
- },
- (3, 4, 4): {"asyncio.tasks.async"},
- (3, 5, 0): {
- "fractions.gcd",
- "inspect.getargvalues",
- "inspect.formatargspec",
- "inspect.formatargvalues",
- "inspect.getcallargs",
- "platform.linux_distribution",
- "platform.dist",
- },
- (3, 6, 0): {"importlib._bootstrap_external.FileLoader.load_module"},
- },
- }
-
- def _check_bad_thread_instantiation(self, node):
- if not node.kwargs and not node.keywords and len(node.args) <= 1:
- self.add_message("bad-thread-instantiation", node=node)
-
- def _check_for_preexec_fn_in_popen(self, node):
- if node.keywords:
- for keyword in node.keywords:
- if keyword.arg == "preexec_fn":
- self.add_message("subprocess-popen-preexec-fn", node=node)
-
- def _check_for_check_kw_in_run(self, node):
- kwargs = {keyword.arg for keyword in (node.keywords or ())}
- if "check" not in kwargs:
- self.add_message("subprocess-run-check", node=node)
-
- def _check_shallow_copy_environ(self, node):
- arg = utils.get_argument_from_call(node, position=0)
- for inferred in arg.inferred():
- if inferred.qname() == OS_ENVIRON:
- self.add_message("shallow-copy-environ", node=node)
- break
-
- @utils.check_messages(
- "bad-open-mode",
- "redundant-unittest-assert",
- "deprecated-method",
- "bad-thread-instantiation",
- "shallow-copy-environ",
- "invalid-envvar-value",
- "invalid-envvar-default",
- "subprocess-popen-preexec-fn",
- "subprocess-run-check",
- )
- def visit_call(self, node):
- """Visit a Call node."""
- try:
- for inferred in node.func.infer():
- if inferred is astroid.Uninferable:
- continue
- if inferred.root().name == OPEN_MODULE:
- if getattr(node.func, "name", None) in OPEN_FILES:
- self._check_open_mode(node)
- elif inferred.root().name == UNITTEST_CASE:
- self._check_redundant_assert(node, inferred)
- elif isinstance(inferred, astroid.ClassDef):
- if inferred.qname() == THREADING_THREAD:
- self._check_bad_thread_instantiation(node)
- elif inferred.qname() == SUBPROCESS_POPEN:
- self._check_for_preexec_fn_in_popen(node)
- elif isinstance(inferred, astroid.FunctionDef):
- name = inferred.qname()
- if name == COPY_COPY:
- self._check_shallow_copy_environ(node)
- elif name in ENV_GETTERS:
- self._check_env_function(node, inferred)
- elif name == SUBPROCESS_RUN:
- self._check_for_check_kw_in_run(node)
- self._check_deprecated_method(node, inferred)
- except astroid.InferenceError:
- return
-
- @utils.check_messages("boolean-datetime")
- def visit_unaryop(self, node):
- if node.op == "not":
- self._check_datetime(node.operand)
-
- @utils.check_messages("boolean-datetime")
- def visit_if(self, node):
- self._check_datetime(node.test)
-
- @utils.check_messages("boolean-datetime")
- def visit_ifexp(self, node):
- self._check_datetime(node.test)
-
- @utils.check_messages("boolean-datetime")
- def visit_boolop(self, node):
- for value in node.values:
- self._check_datetime(value)
-
- def _check_deprecated_method(self, node, inferred):
- py_vers = sys.version_info[0]
-
- if isinstance(node.func, astroid.Attribute):
- func_name = node.func.attrname
- elif isinstance(node.func, astroid.Name):
- func_name = node.func.name
- else:
- # Not interested in other nodes.
- return
-
- # Reject nodes which aren't of interest to us.
- acceptable_nodes = (
- astroid.BoundMethod,
- astroid.UnboundMethod,
- astroid.FunctionDef,
- )
- if not isinstance(inferred, acceptable_nodes):
- return
-
- qname = inferred.qname()
- if any(name in self.deprecated[0] for name in (qname, func_name)):
- self.add_message("deprecated-method", node=node, args=(func_name,))
- else:
- for since_vers, func_list in self.deprecated[py_vers].items():
- if since_vers <= sys.version_info and any(
- name in func_list for name in (qname, func_name)
- ):
- self.add_message("deprecated-method", node=node, args=(func_name,))
- break
-
- def _check_redundant_assert(self, node, infer):
- if (
- isinstance(infer, astroid.BoundMethod)
- and node.args
- and isinstance(node.args[0], astroid.Const)
- and infer.name in ["assertTrue", "assertFalse"]
- ):
- self.add_message(
- "redundant-unittest-assert",
- args=(infer.name, node.args[0].value),
- node=node,
- )
-
- def _check_datetime(self, node):
- """ Check that a datetime was inferred.
- If so, emit boolean-datetime warning.
- """
- try:
- inferred = next(node.infer())
- except astroid.InferenceError:
- return
- if isinstance(inferred, Instance) and inferred.qname() == "datetime.time":
- self.add_message("boolean-datetime", node=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")
- except utils.NoSuchArgumentError:
- return
- if mode_arg:
- mode_arg = utils.safe_infer(mode_arg)
- if isinstance(mode_arg, astroid.Const) and not _check_mode_str(
- mode_arg.value
- ):
- self.add_message("bad-open-mode", node=node, args=mode_arg.value)
-
- def _check_env_function(self, node, infer):
- env_name_kwarg = "key"
- env_value_kwarg = "default"
- if node.keywords:
- kwargs = {keyword.arg: keyword.value for keyword in node.keywords}
- else:
- kwargs = None
- if node.args:
- env_name_arg = node.args[0]
- elif kwargs and env_name_kwarg in kwargs:
- env_name_arg = kwargs[env_name_kwarg]
- else:
- env_name_arg = None
-
- if env_name_arg:
- self._check_invalid_envvar_value(
- node=node,
- message="invalid-envvar-value",
- call_arg=utils.safe_infer(env_name_arg),
- infer=infer,
- allow_none=False,
- )
-
- if len(node.args) == 2:
- env_value_arg = node.args[1]
- elif kwargs and env_value_kwarg in kwargs:
- env_value_arg = kwargs[env_value_kwarg]
- else:
- env_value_arg = None
-
- if env_value_arg:
- self._check_invalid_envvar_value(
- node=node,
- infer=infer,
- message="invalid-envvar-default",
- call_arg=utils.safe_infer(env_value_arg),
- allow_none=True,
- )
-
- def _check_invalid_envvar_value(self, node, infer, message, call_arg, allow_none):
- if call_arg in (astroid.Uninferable, None):
- return
-
- name = infer.qname()
- if isinstance(call_arg, Const):
- emit = False
- if call_arg.value is None:
- emit = not allow_none
- elif not isinstance(call_arg.value, str):
- emit = True
- if emit:
- self.add_message(message, node=node, args=(name, call_arg.pytype()))
- else:
- self.add_message(message, node=node, args=(name, call_arg.pytype()))
-
-
-def register(linter):
- """required method to auto register this checker """
- linter.register_checker(StdlibChecker(linter))