1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
# Copyright (c) 2021 Pierre Sassoulas <pierre.sassoulas@gmail.com>
# Copyright (c) 2021 Mark Byrne <31762852+mbyrnepr2@users.noreply.github.com>
# Copyright (c) 2021 Daniël van Noord <13665637+DanielNoord@users.noreply.github.com>
# 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
"""Checker for features used that are not supported by all python versions
indicated by the py-version setting.
"""
from astroid import nodes
from pylint.checkers import BaseChecker
from pylint.checkers.utils import (
check_messages,
safe_infer,
uninferable_final_decorators,
)
from pylint.interfaces import IAstroidChecker
from pylint.lint import PyLinter
from pylint.utils import get_global_option
class UnsupportedVersionChecker(BaseChecker):
"""Checker for features that are not supported by all python versions
indicated by the py-version setting.
"""
__implements__ = (IAstroidChecker,)
name = "unsupported_version"
msgs = {
"W1601": (
"F-strings are not supported by all versions included in the py-version setting",
"using-f-string-in-unsupported-version",
"Used when the py-version set by the user is lower than 3.6 and pylint encounters "
"a f-string.",
),
"W1602": (
"typing.final is not supported by all versions included in the py-version setting",
"using-final-decorator-in-unsupported-version",
"Used when the py-version set by the user is lower than 3.8 and pylint encounters "
"a ``typing.final`` decorator.",
),
}
def open(self) -> None:
"""Initialize visit variables and statistics."""
py_version = get_global_option(self, "py-version")
self._py36_plus = py_version >= (3, 6)
self._py38_plus = py_version >= (3, 8)
@check_messages("using-f-string-in-unsupported-version")
def visit_joinedstr(self, node: nodes.JoinedStr) -> None:
"""Check f-strings"""
if not self._py36_plus:
self.add_message("using-f-string-in-unsupported-version", node=node)
@check_messages("using-final-decorator-in-unsupported-version")
def visit_decorators(self, node: nodes.Decorators) -> None:
"""Check decorators"""
self._check_typing_final(node)
def _check_typing_final(self, node: nodes.Decorators) -> None:
"""Add a message when the `typing.final` decorator is used and the
py-version is lower than 3.8"""
if self._py38_plus:
return
decorators = []
for decorator in node.get_children():
inferred = safe_infer(decorator)
if inferred and inferred.qname() == "typing.final":
decorators.append(decorator)
for decorator in decorators or uninferable_final_decorators(node):
self.add_message(
"using-final-decorator-in-unsupported-version", node=decorator
)
def register(linter: PyLinter) -> None:
"""Required method to auto register this checker"""
linter.register_checker(UnsupportedVersionChecker(linter))
|
