85 lines
2.9 KiB
Python
85 lines
2.9 KiB
Python
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# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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# For details: https://github.com/pylint-dev/pylint/blob/main/LICENSE
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# Copyright (c) https://github.com/pylint-dev/pylint/blob/main/CONTRIBUTORS.txt
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"""Checker for features used that are not supported by all python versions
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indicated by the py-version setting.
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"""
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from __future__ import annotations
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from typing import TYPE_CHECKING
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from astroid import nodes
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from pylint.checkers import BaseChecker
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from pylint.checkers.utils import (
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only_required_for_messages,
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safe_infer,
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uninferable_final_decorators,
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)
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if TYPE_CHECKING:
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from pylint.lint import PyLinter
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class UnsupportedVersionChecker(BaseChecker):
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"""Checker for features that are not supported by all python versions
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indicated by the py-version setting.
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"""
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name = "unsupported_version"
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msgs = {
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"W2601": (
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"F-strings are not supported by all versions included in the py-version setting",
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"using-f-string-in-unsupported-version",
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"Used when the py-version set by the user is lower than 3.6 and pylint encounters "
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"an f-string.",
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),
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"W2602": (
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"typing.final is not supported by all versions included in the py-version setting",
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"using-final-decorator-in-unsupported-version",
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"Used when the py-version set by the user is lower than 3.8 and pylint encounters "
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"a ``typing.final`` decorator.",
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),
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}
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def open(self) -> None:
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"""Initialize visit variables and statistics."""
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py_version = self.linter.config.py_version
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self._py36_plus = py_version >= (3, 6)
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self._py38_plus = py_version >= (3, 8)
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@only_required_for_messages("using-f-string-in-unsupported-version")
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def visit_joinedstr(self, node: nodes.JoinedStr) -> None:
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"""Check f-strings."""
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if not self._py36_plus:
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self.add_message("using-f-string-in-unsupported-version", node=node)
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@only_required_for_messages("using-final-decorator-in-unsupported-version")
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def visit_decorators(self, node: nodes.Decorators) -> None:
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"""Check decorators."""
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self._check_typing_final(node)
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def _check_typing_final(self, node: nodes.Decorators) -> None:
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"""Add a message when the `typing.final` decorator is used and the
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py-version is lower than 3.8.
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"""
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if self._py38_plus:
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return
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decorators = []
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for decorator in node.get_children():
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inferred = safe_infer(decorator)
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if inferred and inferred.qname() == "typing.final":
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decorators.append(decorator)
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for decorator in decorators or uninferable_final_decorators(node):
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self.add_message(
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"using-final-decorator-in-unsupported-version", node=decorator
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)
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def register(linter: PyLinter) -> None:
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linter.register_checker(UnsupportedVersionChecker(linter))
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