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Path: /opt/cloudlinux/venv/lib64/python3.11/site-packages/pylint/extensions/

Viewing File: empty_comment.py

# 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
# Copyright (c) https://github.com/PyCQA/pylint/blob/main/CONTRIBUTORS.txt

from __future__ import annotations

from typing import TYPE_CHECKING

from astroid import nodes

from pylint.checkers import BaseRawFileChecker

if TYPE_CHECKING:
    from pylint.lint import PyLinter


def is_line_commented(line: bytes) -> bool:
    """Checks if a `# symbol that is not part of a string was found in line."""

    comment_idx = line.find(b"#")
    if comment_idx == -1:
        return False
    if comment_part_of_string(line, comment_idx):
        return is_line_commented(line[:comment_idx] + line[comment_idx + 1 :])
    return True


def comment_part_of_string(line: bytes, comment_idx: int) -> bool:
    """Checks if the symbol at comment_idx is part of a string."""

    if (
        line[:comment_idx].count(b"'") % 2 == 1
        and line[comment_idx:].count(b"'") % 2 == 1
    ) or (
        line[:comment_idx].count(b'"') % 2 == 1
        and line[comment_idx:].count(b'"') % 2 == 1
    ):
        return True
    return False


class CommentChecker(BaseRawFileChecker):
    name = "empty-comment"
    msgs = {
        "R2044": (
            "Line with empty comment",
            "empty-comment",
            (
                "Used when a # symbol appears on a line not followed by an actual comment"
            ),
        )
    }
    options = ()

    def process_module(self, node: nodes.Module) -> None:
        with node.stream() as stream:
            for line_num, line in enumerate(stream):
                line = line.rstrip()
                if line.endswith(b"#"):
                    if not is_line_commented(line[:-1]):
                        self.add_message("empty-comment", line=line_num + 1)


def register(linter: PyLinter) -> None:
    linter.register_checker(CommentChecker(linter))