Add unit tests for calculator

calculator/lib/python3.12/site-packages/flake8/__init__.py

@@ -0,0 +1,70 @@
+"""Top-level module for Flake8.
+
+This module
+
+- initializes logging for the command-line tool
+- tracks the version of the package
+- provides a way to configure logging for the command-line tool
+
+.. autofunction:: flake8.configure_logging
+
+"""
+from __future__ import annotations
+
+import logging
+import sys
+
+LOG = logging.getLogger(__name__)
+LOG.addHandler(logging.NullHandler())
+
+__version__ = "7.3.0"
+__version_info__ = tuple(int(i) for i in __version__.split(".") if i.isdigit())
+
+_VERBOSITY_TO_LOG_LEVEL = {
+    # output more than warnings but not debugging info
+    1: logging.INFO,  # INFO is a numerical level of 20
+    # output debugging information
+    2: logging.DEBUG,  # DEBUG is a numerical level of 10
+}
+
+LOG_FORMAT = (
+    "%(name)-25s %(processName)-11s %(relativeCreated)6d "
+    "%(levelname)-8s %(message)s"
+)
+
+
+def configure_logging(
+    verbosity: int,
+    filename: str | None = None,
+    logformat: str = LOG_FORMAT,
+) -> None:
+    """Configure logging for flake8.
+
+    :param verbosity:
+        How verbose to be in logging information.
+    :param filename:
+        Name of the file to append log information to.
+        If ``None`` this will log to ``sys.stderr``.
+        If the name is "stdout" or "stderr" this will log to the appropriate
+        stream.
+    """
+    if verbosity <= 0:
+        return
+
+    verbosity = min(verbosity, max(_VERBOSITY_TO_LOG_LEVEL))
+    log_level = _VERBOSITY_TO_LOG_LEVEL[verbosity]
+
+    if not filename or filename in ("stderr", "stdout"):
+        fileobj = getattr(sys, filename or "stderr")
+        handler_cls: type[logging.Handler] = logging.StreamHandler
+    else:
+        fileobj = filename
+        handler_cls = logging.FileHandler
+
+    handler = handler_cls(fileobj)
+    handler.setFormatter(logging.Formatter(logformat))
+    LOG.addHandler(handler)
+    LOG.setLevel(log_level)
+    LOG.debug(
+        "Added a %s logging handler to logger root at %s", filename, __name__
+    )

calculator/lib/python3.12/site-packages/flake8/__main__.py

@@ -0,0 +1,7 @@
+"""Module allowing for ``python -m flake8 ...``."""
+from __future__ import annotations
+
+from flake8.main.cli import main
+
+if __name__ == "__main__":
+    raise SystemExit(main())

calculator/lib/python3.12/site-packages/flake8/_compat.py

@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+import sys
+import tokenize
+
+if sys.version_info >= (3, 12):  # pragma: >=3.12 cover
+    FSTRING_START = tokenize.FSTRING_START
+    FSTRING_MIDDLE = tokenize.FSTRING_MIDDLE
+    FSTRING_END = tokenize.FSTRING_END
+else:  # pragma: <3.12 cover
+    FSTRING_START = FSTRING_MIDDLE = FSTRING_END = -1
+
+if sys.version_info >= (3, 14):  # pragma: >=3.14 cover
+    TSTRING_START = tokenize.TSTRING_START
+    TSTRING_MIDDLE = tokenize.TSTRING_MIDDLE
+    TSTRING_END = tokenize.TSTRING_END
+else:  # pragma: <3.14 cover
+    TSTRING_START = TSTRING_MIDDLE = TSTRING_END = -1

calculator/lib/python3.12/site-packages/flake8/api/__init__.py

@@ -0,0 +1,6 @@
+"""Module containing all public entry-points for Flake8.
+
+This is the only submodule in Flake8 with a guaranteed stable API. All other
+submodules are considered internal only and are subject to change.
+"""
+from __future__ import annotations

calculator/lib/python3.12/site-packages/flake8/api/legacy.py

@@ -0,0 +1,216 @@
+"""Module containing shims around Flake8 2.x behaviour.
+
+Previously, users would import :func:`get_style_guide` from ``flake8.engine``.
+In 3.0 we no longer have an "engine" module but we maintain the API from it.
+"""
+from __future__ import annotations
+
+import argparse
+import logging
+import os.path
+from typing import Any
+
+from flake8.discover_files import expand_paths
+from flake8.formatting import base as formatter
+from flake8.main import application as app
+from flake8.options.parse_args import parse_args
+
+LOG = logging.getLogger(__name__)
+
+
+__all__ = ("get_style_guide",)
+
+
+class Report:
+    """Public facing object that mimic's Flake8 2.0's API.
+
+    .. note::
+
+        There are important changes in how this object behaves compared to
+        the object provided in Flake8 2.x.
+
+    .. warning::
+
+        This should not be instantiated by users.
+
+    .. versionchanged:: 3.0.0
+    """
+
+    def __init__(self, application: app.Application) -> None:
+        """Initialize the Report for the user.
+
+        .. warning:: This should not be instantiated by users.
+        """
+        assert application.guide is not None
+        self._application = application
+        self._style_guide = application.guide
+        self._stats = self._style_guide.stats
+
+    @property
+    def total_errors(self) -> int:
+        """Return the total number of errors."""
+        return self._application.result_count
+
+    def get_statistics(self, violation: str) -> list[str]:
+        """Get the list of occurrences of a violation.
+
+        :returns:
+            List of occurrences of a violation formatted as:
+            {Count} {Error Code} {Message}, e.g.,
+            ``8 E531 Some error message about the error``
+        """
+        return [
+            f"{s.count} {s.error_code} {s.message}"
+            for s in self._stats.statistics_for(violation)
+        ]
+
+
+class StyleGuide:
+    """Public facing object that mimic's Flake8 2.0's StyleGuide.
+
+    .. note::
+
+        There are important changes in how this object behaves compared to
+        the StyleGuide object provided in Flake8 2.x.
+
+    .. warning::
+
+        This object should not be instantiated directly by users.
+
+    .. versionchanged:: 3.0.0
+    """
+
+    def __init__(self, application: app.Application) -> None:
+        """Initialize our StyleGuide."""
+        self._application = application
+        self._file_checker_manager = application.file_checker_manager
+
+    @property
+    def options(self) -> argparse.Namespace:
+        """Return application's options.
+
+        An instance of :class:`argparse.Namespace` containing parsed options.
+        """
+        assert self._application.options is not None
+        return self._application.options
+
+    @property
+    def paths(self) -> list[str]:
+        """Return the extra arguments passed as paths."""
+        assert self._application.options is not None
+        return self._application.options.filenames
+
+    def check_files(self, paths: list[str] | None = None) -> Report:
+        """Run collected checks on the files provided.
+
+        This will check the files passed in and return a :class:`Report`
+        instance.
+
+        :param paths:
+            List of filenames (or paths) to check.
+        :returns:
+            Object that mimic's Flake8 2.0's Reporter class.
+        """
+        assert self._application.options is not None
+        self._application.options.filenames = paths
+        self._application.run_checks()
+        self._application.report_errors()
+        return Report(self._application)
+
+    def excluded(self, filename: str, parent: str | None = None) -> bool:
+        """Determine if a file is excluded.
+
+        :param filename:
+            Path to the file to check if it is excluded.
+        :param parent:
+            Name of the parent directory containing the file.
+        :returns:
+            True if the filename is excluded, False otherwise.
+        """
+
+        def excluded(path: str) -> bool:
+            paths = tuple(
+                expand_paths(
+                    paths=[path],
+                    stdin_display_name=self.options.stdin_display_name,
+                    filename_patterns=self.options.filename,
+                    exclude=self.options.exclude,
+                )
+            )
+            return not paths
+
+        return excluded(filename) or (
+            parent is not None and excluded(os.path.join(parent, filename))
+        )
+
+    def init_report(
+        self,
+        reporter: type[formatter.BaseFormatter] | None = None,
+    ) -> None:
+        """Set up a formatter for this run of Flake8."""
+        if reporter is None:
+            return
+        if not issubclass(reporter, formatter.BaseFormatter):
+            raise ValueError(
+                "Report should be subclass of "
+                "flake8.formatter.BaseFormatter."
+            )
+        self._application.formatter = reporter(self.options)
+        self._application.guide = None
+        # NOTE(sigmavirus24): This isn't the intended use of
+        # Application#make_guide but it works pretty well.
+        # Stop cringing... I know it's gross.
+        self._application.make_guide()
+        self._application.file_checker_manager = None
+        self._application.make_file_checker_manager([])
+
+    def input_file(
+        self,
+        filename: str,
+        lines: Any | None = None,
+        expected: Any | None = None,
+        line_offset: Any | None = 0,
+    ) -> Report:
+        """Run collected checks on a single file.
+
+        This will check the file passed in and return a :class:`Report`
+        instance.
+
+        :param filename:
+            The path to the file to check.
+        :param lines:
+            Ignored since Flake8 3.0.
+        :param expected:
+            Ignored since Flake8 3.0.
+        :param line_offset:
+            Ignored since Flake8 3.0.
+        :returns:
+            Object that mimic's Flake8 2.0's Reporter class.
+        """
+        return self.check_files([filename])
+
+
+def get_style_guide(**kwargs: Any) -> StyleGuide:
+    r"""Provision a StyleGuide for use.
+
+    :param \*\*kwargs:
+        Keyword arguments that provide some options for the StyleGuide.
+    :returns:
+        An initialized StyleGuide
+    """
+    application = app.Application()
+    application.plugins, application.options = parse_args([])
+    # We basically want application.initialize to be called but with these
+    # options set instead before we make our formatter, notifier, internal
+    # style guide and file checker manager.
+    options = application.options
+    for key, value in kwargs.items():
+        try:
+            getattr(options, key)
+            setattr(options, key, value)
+        except AttributeError:
+            LOG.error('Could not update option "%s"', key)
+    application.make_formatter()
+    application.make_guide()
+    application.make_file_checker_manager([])
+    return StyleGuide(application)

calculator/lib/python3.12/site-packages/flake8/checker.py

@@ -0,0 +1,616 @@
+"""Checker Manager and Checker classes."""
+from __future__ import annotations
+
+import argparse
+import contextlib
+import errno
+import logging
+import multiprocessing.pool
+import operator
+import signal
+import tokenize
+from collections.abc import Generator
+from collections.abc import Sequence
+from typing import Any
+from typing import Optional
+
+from flake8 import defaults
+from flake8 import exceptions
+from flake8 import processor
+from flake8 import utils
+from flake8._compat import FSTRING_START
+from flake8._compat import TSTRING_START
+from flake8.discover_files import expand_paths
+from flake8.options.parse_args import parse_args
+from flake8.plugins.finder import Checkers
+from flake8.plugins.finder import LoadedPlugin
+from flake8.style_guide import StyleGuideManager
+
+Results = list[tuple[str, int, int, str, Optional[str]]]
+
+LOG = logging.getLogger(__name__)
+
+SERIAL_RETRY_ERRNOS = {
+    # ENOSPC: Added by sigmavirus24
+    # > On some operating systems (OSX), multiprocessing may cause an
+    # > ENOSPC error while trying to create a Semaphore.
+    # > In those cases, we should replace the customized Queue Report
+    # > class with pep8's StandardReport class to ensure users don't run
+    # > into this problem.
+    # > (See also: https://github.com/pycqa/flake8/issues/117)
+    errno.ENOSPC,
+    # NOTE(sigmavirus24): When adding to this list, include the reasoning
+    # on the lines before the error code and always append your error
+    # code. Further, please always add a trailing `,` to reduce the visual
+    # noise in diffs.
+}
+
+_mp_plugins: Checkers
+_mp_options: argparse.Namespace
+
+
+@contextlib.contextmanager
+def _mp_prefork(
+    plugins: Checkers, options: argparse.Namespace
+) -> Generator[None]:
+    # we can save significant startup work w/ `fork` multiprocessing
+    global _mp_plugins, _mp_options
+    _mp_plugins, _mp_options = plugins, options
+    try:
+        yield
+    finally:
+        del _mp_plugins, _mp_options
+
+
+def _mp_init(argv: Sequence[str]) -> None:
+    global _mp_plugins, _mp_options
+
+    # Ensure correct signaling of ^C using multiprocessing.Pool.
+    signal.signal(signal.SIGINT, signal.SIG_IGN)
+
+    try:
+        # for `fork` this'll already be set
+        _mp_plugins, _mp_options  # noqa: B018
+    except NameError:
+        plugins, options = parse_args(argv)
+        _mp_plugins, _mp_options = plugins.checkers, options
+
+
+def _mp_run(filename: str) -> tuple[str, Results, dict[str, int]]:
+    return FileChecker(
+        filename=filename, plugins=_mp_plugins, options=_mp_options
+    ).run_checks()
+
+
+class Manager:
+    """Manage the parallelism and checker instances for each plugin and file.
+
+    This class will be responsible for the following:
+
+    - Determining the parallelism of Flake8, e.g.:
+
+      * Do we use :mod:`multiprocessing` or is it unavailable?
+
+      * Do we automatically decide on the number of jobs to use or did the
+        user provide that?
+
+    - Falling back to a serial way of processing files if we run into an
+      OSError related to :mod:`multiprocessing`
+
+    - Organizing the results of each checker so we can group the output
+      together and make our output deterministic.
+    """
+
+    def __init__(
+        self,
+        style_guide: StyleGuideManager,
+        plugins: Checkers,
+        argv: Sequence[str],
+    ) -> None:
+        """Initialize our Manager instance."""
+        self.style_guide = style_guide
+        self.options = style_guide.options
+        self.plugins = plugins
+        self.jobs = self._job_count()
+        self.statistics = {
+            "files": 0,
+            "logical lines": 0,
+            "physical lines": 0,
+            "tokens": 0,
+        }
+        self.exclude = (*self.options.exclude, *self.options.extend_exclude)
+        self.argv = argv
+        self.results: list[tuple[str, Results, dict[str, int]]] = []
+
+    def _process_statistics(self) -> None:
+        for _, _, statistics in self.results:
+            for statistic in defaults.STATISTIC_NAMES:
+                self.statistics[statistic] += statistics[statistic]
+        self.statistics["files"] += len(self.filenames)
+
+    def _job_count(self) -> int:
+        # First we walk through all of our error cases:
+        # - multiprocessing library is not present
+        # - the user provided stdin and that's not something we can handle
+        #   well
+        # - the user provided some awful input
+
+        if utils.is_using_stdin(self.options.filenames):
+            LOG.warning(
+                "The --jobs option is not compatible with supplying "
+                "input using - . Ignoring --jobs arguments."
+            )
+            return 0
+
+        jobs = self.options.jobs
+
+        # If the value is "auto", we want to let the multiprocessing library
+        # decide the number based on the number of CPUs. However, if that
+        # function is not implemented for this particular value of Python we
+        # default to 1
+        if jobs.is_auto:
+            try:
+                return multiprocessing.cpu_count()
+            except NotImplementedError:
+                return 0
+
+        # Otherwise, we know jobs should be an integer and we can just convert
+        # it to an integer
+        return jobs.n_jobs
+
+    def _handle_results(self, filename: str, results: Results) -> int:
+        style_guide = self.style_guide
+        reported_results_count = 0
+        for error_code, line_number, column, text, physical_line in results:
+            reported_results_count += style_guide.handle_error(
+                code=error_code,
+                filename=filename,
+                line_number=line_number,
+                column_number=column,
+                text=text,
+                physical_line=physical_line,
+            )
+        return reported_results_count
+
+    def report(self) -> tuple[int, int]:
+        """Report all of the errors found in the managed file checkers.
+
+        This iterates over each of the checkers and reports the errors sorted
+        by line number.
+
+        :returns:
+            A tuple of the total results found and the results reported.
+        """
+        results_reported = results_found = 0
+        self.results.sort(key=operator.itemgetter(0))
+        for filename, results, _ in self.results:
+            results.sort(key=operator.itemgetter(1, 2))
+            with self.style_guide.processing_file(filename):
+                results_reported += self._handle_results(filename, results)
+            results_found += len(results)
+        return (results_found, results_reported)
+
+    def run_parallel(self) -> None:
+        """Run the checkers in parallel."""
+        with _mp_prefork(self.plugins, self.options):
+            pool = _try_initialize_processpool(self.jobs, self.argv)
+
+        if pool is None:
+            self.run_serial()
+            return
+
+        pool_closed = False
+        try:
+            self.results = list(pool.imap_unordered(_mp_run, self.filenames))
+            pool.close()
+            pool.join()
+            pool_closed = True
+        finally:
+            if not pool_closed:
+                pool.terminate()
+                pool.join()
+
+    def run_serial(self) -> None:
+        """Run the checkers in serial."""
+        self.results = [
+            FileChecker(
+                filename=filename,
+                plugins=self.plugins,
+                options=self.options,
+            ).run_checks()
+            for filename in self.filenames
+        ]
+
+    def run(self) -> None:
+        """Run all the checkers.
+
+        This will intelligently decide whether to run the checks in parallel
+        or whether to run them in serial.
+
+        If running the checks in parallel causes a problem (e.g.,
+        :issue:`117`) this also implements fallback to serial processing.
+        """
+        try:
+            if self.jobs > 1 and len(self.filenames) > 1:
+                self.run_parallel()
+            else:
+                self.run_serial()
+        except KeyboardInterrupt:
+            LOG.warning("Flake8 was interrupted by the user")
+            raise exceptions.EarlyQuit("Early quit while running checks")
+
+    def start(self) -> None:
+        """Start checking files.
+
+        :param paths:
+            Path names to check. This is passed directly to
+            :meth:`~Manager.make_checkers`.
+        """
+        LOG.info("Making checkers")
+        self.filenames = tuple(
+            expand_paths(
+                paths=self.options.filenames,
+                stdin_display_name=self.options.stdin_display_name,
+                filename_patterns=self.options.filename,
+                exclude=self.exclude,
+            )
+        )
+        self.jobs = min(len(self.filenames), self.jobs)
+
+    def stop(self) -> None:
+        """Stop checking files."""
+        self._process_statistics()
+
+
+class FileChecker:
+    """Manage running checks for a file and aggregate the results."""
+
+    def __init__(
+        self,
+        *,
+        filename: str,
+        plugins: Checkers,
+        options: argparse.Namespace,
+    ) -> None:
+        """Initialize our file checker."""
+        self.options = options
+        self.filename = filename
+        self.plugins = plugins
+        self.results: Results = []
+        self.statistics = {
+            "tokens": 0,
+            "logical lines": 0,
+            "physical lines": 0,
+        }
+        self.processor = self._make_processor()
+        self.display_name = filename
+        self.should_process = False
+        if self.processor is not None:
+            self.display_name = self.processor.filename
+            self.should_process = not self.processor.should_ignore_file()
+            self.statistics["physical lines"] = len(self.processor.lines)
+
+    def __repr__(self) -> str:
+        """Provide helpful debugging representation."""
+        return f"FileChecker for {self.filename}"
+
+    def _make_processor(self) -> processor.FileProcessor | None:
+        try:
+            return processor.FileProcessor(self.filename, self.options)
+        except OSError as e:
+            # If we can not read the file due to an IOError (e.g., the file
+            # does not exist or we do not have the permissions to open it)
+            # then we need to format that exception for the user.
+            # NOTE(sigmavirus24): Historically, pep8 has always reported this
+            # as an E902. We probably *want* a better error code for this
+            # going forward.
+            self.report("E902", 0, 0, f"{type(e).__name__}: {e}")
+            return None
+
+    def report(
+        self,
+        error_code: str | None,
+        line_number: int,
+        column: int,
+        text: str,
+    ) -> str:
+        """Report an error by storing it in the results list."""
+        if error_code is None:
+            error_code, text = text.split(" ", 1)
+
+        # If we're recovering from a problem in _make_processor, we will not
+        # have this attribute.
+        if hasattr(self, "processor") and self.processor is not None:
+            line = self.processor.noqa_line_for(line_number)
+        else:
+            line = None
+
+        self.results.append((error_code, line_number, column, text, line))
+        return error_code
+
+    def run_check(self, plugin: LoadedPlugin, **arguments: Any) -> Any:
+        """Run the check in a single plugin."""
+        assert self.processor is not None, self.filename
+        try:
+            params = self.processor.keyword_arguments_for(
+                plugin.parameters, arguments
+            )
+        except AttributeError as ae:
+            raise exceptions.PluginRequestedUnknownParameters(
+                plugin_name=plugin.display_name, exception=ae
+            )
+        try:
+            return plugin.obj(**arguments, **params)
+        except Exception as all_exc:
+            LOG.critical(
+                "Plugin %s raised an unexpected exception",
+                plugin.display_name,
+                exc_info=True,
+            )
+            raise exceptions.PluginExecutionFailed(
+                filename=self.filename,
+                plugin_name=plugin.display_name,
+                exception=all_exc,
+            )
+
+    @staticmethod
+    def _extract_syntax_information(exception: Exception) -> tuple[int, int]:
+        if (
+            len(exception.args) > 1
+            and exception.args[1]
+            and len(exception.args[1]) > 2
+        ):
+            token = exception.args[1]
+            row, column = token[1:3]
+        elif (
+            isinstance(exception, tokenize.TokenError)
+            and len(exception.args) == 2
+            and len(exception.args[1]) == 2
+        ):
+            token = ()
+            row, column = exception.args[1]
+        else:
+            token = ()
+            row, column = (1, 0)
+
+        if (
+            column > 0
+            and token
+            and isinstance(exception, SyntaxError)
+            and len(token) == 4  # Python 3.9 or earlier
+        ):
+            # NOTE(sigmavirus24): SyntaxErrors report 1-indexed column
+            # numbers. We need to decrement the column number by 1 at
+            # least.
+            column_offset = 1
+            row_offset = 0
+            # See also: https://github.com/pycqa/flake8/issues/169,
+            # https://github.com/PyCQA/flake8/issues/1372
+            # On Python 3.9 and earlier, token will be a 4-item tuple with the
+            # last item being the string. Starting with 3.10, they added to
+            # the tuple so now instead of it ending with the code that failed
+            # to parse, it ends with the end of the section of code that
+            # failed to parse. Luckily the absolute position in the tuple is
+            # stable across versions so we can use that here
+            physical_line = token[3]
+
+            # NOTE(sigmavirus24): Not all "tokens" have a string as the last
+            # argument. In this event, let's skip trying to find the correct
+            # column and row values.
+            if physical_line is not None:
+                # NOTE(sigmavirus24): SyntaxErrors also don't exactly have a
+                # "physical" line so much as what was accumulated by the point
+                # tokenizing failed.
+                # See also: https://github.com/pycqa/flake8/issues/169
+                lines = physical_line.rstrip("\n").split("\n")
+                row_offset = len(lines) - 1
+                logical_line = lines[0]
+                logical_line_length = len(logical_line)
+                if column > logical_line_length:
+                    column = logical_line_length
+            row -= row_offset
+            column -= column_offset
+        return row, column
+
+    def run_ast_checks(self) -> None:
+        """Run all checks expecting an abstract syntax tree."""
+        assert self.processor is not None, self.filename
+        ast = self.processor.build_ast()
+
+        for plugin in self.plugins.tree:
+            checker = self.run_check(plugin, tree=ast)
+            # If the plugin uses a class, call the run method of it, otherwise
+            # the call should return something iterable itself
+            try:
+                runner = checker.run()
+            except AttributeError:
+                runner = checker
+            for line_number, offset, text, _ in runner:
+                self.report(
+                    error_code=None,
+                    line_number=line_number,
+                    column=offset,
+                    text=text,
+                )
+
+    def run_logical_checks(self) -> None:
+        """Run all checks expecting a logical line."""
+        assert self.processor is not None
+        comments, logical_line, mapping = self.processor.build_logical_line()
+        if not mapping:
+            return
+        self.processor.update_state(mapping)
+
+        LOG.debug('Logical line: "%s"', logical_line.rstrip())
+
+        for plugin in self.plugins.logical_line:
+            self.processor.update_checker_state_for(plugin)
+            results = self.run_check(plugin, logical_line=logical_line) or ()
+            for offset, text in results:
+                line_number, column_offset = find_offset(offset, mapping)
+                if line_number == column_offset == 0:
+                    LOG.warning("position of error out of bounds: %s", plugin)
+                self.report(
+                    error_code=None,
+                    line_number=line_number,
+                    column=column_offset,
+                    text=text,
+                )
+
+        self.processor.next_logical_line()
+
+    def run_physical_checks(self, physical_line: str) -> None:
+        """Run all checks for a given physical line.
+
+        A single physical check may return multiple errors.
+        """
+        assert self.processor is not None
+        for plugin in self.plugins.physical_line:
+            self.processor.update_checker_state_for(plugin)
+            result = self.run_check(plugin, physical_line=physical_line)
+
+            if result is not None:
+                # This is a single result if first element is an int
+                column_offset = None
+                try:
+                    column_offset = result[0]
+                except (IndexError, TypeError):
+                    pass
+
+                if isinstance(column_offset, int):
+                    # If we only have a single result, convert to a collection
+                    result = (result,)
+
+                for result_single in result:
+                    column_offset, text = result_single
+                    self.report(
+                        error_code=None,
+                        line_number=self.processor.line_number,
+                        column=column_offset,
+                        text=text,
+                    )
+
+    def process_tokens(self) -> None:
+        """Process tokens and trigger checks.
+
+        Instead of using this directly, you should use
+        :meth:`flake8.checker.FileChecker.run_checks`.
+        """
+        assert self.processor is not None
+        parens = 0
+        statistics = self.statistics
+        file_processor = self.processor
+        prev_physical = ""
+        for token in file_processor.generate_tokens():
+            statistics["tokens"] += 1
+            self.check_physical_eol(token, prev_physical)
+            token_type, text = token[0:2]
+            if token_type == tokenize.OP:
+                parens = processor.count_parentheses(parens, text)
+            elif parens == 0:
+                if processor.token_is_newline(token):
+                    self.handle_newline(token_type)
+            prev_physical = token[4]
+
+        if file_processor.tokens:
+            # If any tokens are left over, process them
+            self.run_physical_checks(file_processor.lines[-1])
+            self.run_logical_checks()
+
+    def run_checks(self) -> tuple[str, Results, dict[str, int]]:
+        """Run checks against the file."""
+        if self.processor is None or not self.should_process:
+            return self.display_name, self.results, self.statistics
+
+        try:
+            self.run_ast_checks()
+            self.process_tokens()
+        except (SyntaxError, tokenize.TokenError) as e:
+            code = "E902" if isinstance(e, tokenize.TokenError) else "E999"
+            row, column = self._extract_syntax_information(e)
+            self.report(code, row, column, f"{type(e).__name__}: {e.args[0]}")
+            return self.display_name, self.results, self.statistics
+
+        logical_lines = self.processor.statistics["logical lines"]
+        self.statistics["logical lines"] = logical_lines
+        return self.display_name, self.results, self.statistics
+
+    def handle_newline(self, token_type: int) -> None:
+        """Handle the logic when encountering a newline token."""
+        assert self.processor is not None
+        if token_type == tokenize.NEWLINE:
+            self.run_logical_checks()
+            self.processor.reset_blank_before()
+        elif len(self.processor.tokens) == 1:
+            # The physical line contains only this token.
+            self.processor.visited_new_blank_line()
+            self.processor.delete_first_token()
+        else:
+            self.run_logical_checks()
+
+    def check_physical_eol(
+        self, token: tokenize.TokenInfo, prev_physical: str
+    ) -> None:
+        """Run physical checks if and only if it is at the end of the line."""
+        assert self.processor is not None
+        if token.type == FSTRING_START:  # pragma: >=3.12 cover
+            self.processor.fstring_start(token.start[0])
+        elif token.type == TSTRING_START:  # pragma: >=3.14 cover
+            self.processor.tstring_start(token.start[0])
+        # a newline token ends a single physical line.
+        elif processor.is_eol_token(token):
+            # if the file does not end with a newline, the NEWLINE
+            # token is inserted by the parser, but it does not contain
+            # the previous physical line in `token[4]`
+            if token.line == "":
+                self.run_physical_checks(prev_physical)
+            else:
+                self.run_physical_checks(token.line)
+        elif processor.is_multiline_string(token):
+            # Less obviously, a string that contains newlines is a
+            # multiline string, either triple-quoted or with internal
+            # newlines backslash-escaped. Check every physical line in the
+            # string *except* for the last one: its newline is outside of
+            # the multiline string, so we consider it a regular physical
+            # line, and will check it like any other physical line.
+            #
+            # Subtleties:
+            # - have to wind self.line_number back because initially it
+            #   points to the last line of the string, and we want
+            #   check_physical() to give accurate feedback
+            for line in self.processor.multiline_string(token):
+                self.run_physical_checks(line)
+
+
+def _try_initialize_processpool(
+    job_count: int,
+    argv: Sequence[str],
+) -> multiprocessing.pool.Pool | None:
+    """Return a new process pool instance if we are able to create one."""
+    try:
+        return multiprocessing.Pool(job_count, _mp_init, initargs=(argv,))
+    except OSError as err:
+        if err.errno not in SERIAL_RETRY_ERRNOS:
+            raise
+    except ImportError:
+        pass
+
+    return None
+
+
+def find_offset(
+    offset: int, mapping: processor._LogicalMapping
+) -> tuple[int, int]:
+    """Find the offset tuple for a single offset."""
+    if isinstance(offset, tuple):
+        return offset
+
+    for token in mapping:
+        token_offset = token[0]
+        if offset <= token_offset:
+            position = token[1]
+            break
+    else:
+        position = (0, 0)
+        offset = token_offset = 0
+    return (position[0], position[1] + offset - token_offset)

calculator/lib/python3.12/site-packages/flake8/defaults.py

@@ -0,0 +1,45 @@
+"""Constants that define defaults."""
+from __future__ import annotations
+
+import re
+
+EXCLUDE = (
+    ".svn",
+    "CVS",
+    ".bzr",
+    ".hg",
+    ".git",
+    "__pycache__",
+    ".tox",
+    ".nox",
+    ".eggs",
+    "*.egg",
+)
+IGNORE = ("E121", "E123", "E126", "E226", "E24", "E704", "W503", "W504")
+MAX_LINE_LENGTH = 79
+INDENT_SIZE = 4
+
+# Other constants
+WHITESPACE = frozenset(" \t")
+
+STATISTIC_NAMES = ("logical lines", "physical lines", "tokens")
+
+NOQA_INLINE_REGEXP = re.compile(
+    # We're looking for items that look like this:
+    # ``# noqa``
+    # ``# noqa: E123``
+    # ``# noqa: E123,W451,F921``
+    # ``# noqa:E123,W451,F921``
+    # ``# NoQA: E123,W451,F921``
+    # ``# NOQA: E123,W451,F921``
+    # ``# NOQA:E123,W451,F921``
+    # We do not want to capture the ``: `` that follows ``noqa``
+    # We do not care about the casing of ``noqa``
+    # We want a comma-separated list of errors
+    r"# noqa(?::[\s]?(?P<codes>([A-Z]+[0-9]+(?:[,\s]+)?)+))?",
+    re.IGNORECASE,
+)
+
+NOQA_FILE = re.compile(r"\s*# flake8[:=]\s*noqa", re.I)
+
+VALID_CODE_PREFIX = re.compile("^[A-Z]{1,3}[0-9]{0,3}$", re.ASCII)

calculator/lib/python3.12/site-packages/flake8/discover_files.py

@@ -0,0 +1,89 @@
+"""Functions related to discovering paths."""
+from __future__ import annotations
+
+import logging
+import os.path
+from collections.abc import Generator
+from collections.abc import Sequence
+from typing import Callable
+
+from flake8 import utils
+
+LOG = logging.getLogger(__name__)
+
+
+def _filenames_from(
+    arg: str,
+    *,
+    predicate: Callable[[str], bool],
+) -> Generator[str]:
+    """Generate filenames from an argument.
+
+    :param arg:
+        Parameter from the command-line.
+    :param predicate:
+        Predicate to use to filter out filenames. If the predicate
+        returns ``True`` we will exclude the filename, otherwise we
+        will yield it. By default, we include every filename
+        generated.
+    :returns:
+        Generator of paths
+    """
+    if predicate(arg):
+        return
+
+    if os.path.isdir(arg):
+        for root, sub_directories, files in os.walk(arg):
+            # NOTE(sigmavirus24): os.walk() will skip a directory if you
+            # remove it from the list of sub-directories.
+            for directory in tuple(sub_directories):
+                joined = os.path.join(root, directory)
+                if predicate(joined):
+                    sub_directories.remove(directory)
+
+            for filename in files:
+                joined = os.path.join(root, filename)
+                if not predicate(joined):
+                    yield joined
+    else:
+        yield arg
+
+
+def expand_paths(
+    *,
+    paths: Sequence[str],
+    stdin_display_name: str,
+    filename_patterns: Sequence[str],
+    exclude: Sequence[str],
+) -> Generator[str]:
+    """Expand out ``paths`` from commandline to the lintable files."""
+    if not paths:
+        paths = ["."]
+
+    def is_excluded(arg: str) -> bool:
+        if arg == "-":
+            # if the stdin_display_name is the default, always include it
+            if stdin_display_name == "stdin":
+                return False
+            arg = stdin_display_name
+
+        return utils.matches_filename(
+            arg,
+            patterns=exclude,
+            log_message='"%(path)s" has %(whether)sbeen excluded',
+            logger=LOG,
+        )
+
+    return (
+        filename
+        for path in paths
+        for filename in _filenames_from(path, predicate=is_excluded)
+        if (
+            # always lint `-`
+            filename == "-"
+            # always lint explicitly passed (even if not matching filter)
+            or path == filename
+            # otherwise, check the file against filtered patterns
+            or utils.fnmatch(filename, filename_patterns)
+        )
+    )

calculator/lib/python3.12/site-packages/flake8/exceptions.py

@@ -0,0 +1,78 @@
+"""Exception classes for all of Flake8."""
+from __future__ import annotations
+
+
+class Flake8Exception(Exception):
+    """Plain Flake8 exception."""
+
+
+class EarlyQuit(Flake8Exception):
+    """Except raised when encountering a KeyboardInterrupt."""
+
+
+class ExecutionError(Flake8Exception):
+    """Exception raised during execution of Flake8."""
+
+
+class FailedToLoadPlugin(Flake8Exception):
+    """Exception raised when a plugin fails to load."""
+
+    FORMAT = 'Flake8 failed to load plugin "%(name)s" due to %(exc)s.'
+
+    def __init__(self, plugin_name: str, exception: Exception) -> None:
+        """Initialize our FailedToLoadPlugin exception."""
+        self.plugin_name = plugin_name
+        self.original_exception = exception
+        super().__init__(plugin_name, exception)
+
+    def __str__(self) -> str:
+        """Format our exception message."""
+        return self.FORMAT % {
+            "name": self.plugin_name,
+            "exc": self.original_exception,
+        }
+
+
+class PluginRequestedUnknownParameters(Flake8Exception):
+    """The plugin requested unknown parameters."""
+
+    FORMAT = '"%(name)s" requested unknown parameters causing %(exc)s'
+
+    def __init__(self, plugin_name: str, exception: Exception) -> None:
+        """Pop certain keyword arguments for initialization."""
+        self.plugin_name = plugin_name
+        self.original_exception = exception
+        super().__init__(plugin_name, exception)
+
+    def __str__(self) -> str:
+        """Format our exception message."""
+        return self.FORMAT % {
+            "name": self.plugin_name,
+            "exc": self.original_exception,
+        }
+
+
+class PluginExecutionFailed(Flake8Exception):
+    """The plugin failed during execution."""
+
+    FORMAT = '{fname}: "{plugin}" failed during execution due to {exc!r}'
+
+    def __init__(
+        self,
+        filename: str,
+        plugin_name: str,
+        exception: Exception,
+    ) -> None:
+        """Utilize keyword arguments for message generation."""
+        self.filename = filename
+        self.plugin_name = plugin_name
+        self.original_exception = exception
+        super().__init__(filename, plugin_name, exception)
+
+    def __str__(self) -> str:
+        """Format our exception message."""
+        return self.FORMAT.format(
+            fname=self.filename,
+            plugin=self.plugin_name,
+            exc=self.original_exception,
+        )

calculator/lib/python3.12/site-packages/flake8/formatting/__init__.py

@@ -0,0 +1,2 @@
+"""Submodule containing the default formatters for Flake8."""
+from __future__ import annotations

calculator/lib/python3.12/site-packages/flake8/formatting/_windows_color.py

@@ -0,0 +1,61 @@
+"""ctypes hackery to enable color processing on windows.
+
+See: https://github.com/pre-commit/pre-commit/blob/cb40e96/pre_commit/color.py
+"""
+from __future__ import annotations
+
+import sys
+
+if sys.platform == "win32":  # pragma: no cover (windows)
+
+    def _enable() -> None:
+        from ctypes import POINTER
+        from ctypes import windll
+        from ctypes import WinError
+        from ctypes import WINFUNCTYPE
+        from ctypes.wintypes import BOOL
+        from ctypes.wintypes import DWORD
+        from ctypes.wintypes import HANDLE
+
+        STD_ERROR_HANDLE = -12
+        ENABLE_VIRTUAL_TERMINAL_PROCESSING = 4
+
+        def bool_errcheck(result, func, args):
+            if not result:
+                raise WinError()
+            return args
+
+        GetStdHandle = WINFUNCTYPE(HANDLE, DWORD)(
+            ("GetStdHandle", windll.kernel32),
+            ((1, "nStdHandle"),),
+        )
+
+        GetConsoleMode = WINFUNCTYPE(BOOL, HANDLE, POINTER(DWORD))(
+            ("GetConsoleMode", windll.kernel32),
+            ((1, "hConsoleHandle"), (2, "lpMode")),
+        )
+        GetConsoleMode.errcheck = bool_errcheck
+
+        SetConsoleMode = WINFUNCTYPE(BOOL, HANDLE, DWORD)(
+            ("SetConsoleMode", windll.kernel32),
+            ((1, "hConsoleHandle"), (1, "dwMode")),
+        )
+        SetConsoleMode.errcheck = bool_errcheck
+
+        # As of Windows 10, the Windows console supports (some) ANSI escape
+        # sequences, but it needs to be enabled using `SetConsoleMode` first.
+        #
+        # More info on the escape sequences supported:
+        # https://msdn.microsoft.com/en-us/library/windows/desktop/mt638032(v=vs.85).aspx
+        stderr = GetStdHandle(STD_ERROR_HANDLE)
+        flags = GetConsoleMode(stderr)
+        SetConsoleMode(stderr, flags | ENABLE_VIRTUAL_TERMINAL_PROCESSING)
+
+    try:
+        _enable()
+    except OSError:
+        terminal_supports_color = False
+    else:
+        terminal_supports_color = True
+else:  # pragma: win32 no cover
+    terminal_supports_color = True

calculator/lib/python3.12/site-packages/flake8/formatting/base.py

@@ -0,0 +1,202 @@
+"""The base class and interface for all formatting plugins."""
+from __future__ import annotations
+
+import argparse
+import os
+import sys
+from typing import IO
+
+from flake8.formatting import _windows_color
+from flake8.statistics import Statistics
+from flake8.violation import Violation
+
+
+class BaseFormatter:
+    """Class defining the formatter interface.
+
+    .. attribute:: options
+
+        The options parsed from both configuration files and the command-line.
+
+    .. attribute:: filename
+
+        If specified by the user, the path to store the results of the run.
+
+    .. attribute:: output_fd
+
+        Initialized when the :meth:`start` is called. This will be a file
+        object opened for writing.
+
+    .. attribute:: newline
+
+        The string to add to the end of a line. This is only used when the
+        output filename has been specified.
+    """
+
+    def __init__(self, options: argparse.Namespace) -> None:
+        """Initialize with the options parsed from config and cli.
+
+        This also calls a hook, :meth:`after_init`, so subclasses do not need
+        to call super to call this method.
+
+        :param options:
+            User specified configuration parsed from both configuration files
+            and the command-line interface.
+        """
+        self.options = options
+        self.filename = options.output_file
+        self.output_fd: IO[str] | None = None
+        self.newline = "\n"
+        self.color = options.color == "always" or (
+            options.color == "auto"
+            and sys.stdout.isatty()
+            and _windows_color.terminal_supports_color
+        )
+        self.after_init()
+
+    def after_init(self) -> None:
+        """Initialize the formatter further."""
+
+    def beginning(self, filename: str) -> None:
+        """Notify the formatter that we're starting to process a file.
+
+        :param filename:
+            The name of the file that Flake8 is beginning to report results
+            from.
+        """
+
+    def finished(self, filename: str) -> None:
+        """Notify the formatter that we've finished processing a file.
+
+        :param filename:
+            The name of the file that Flake8 has finished reporting results
+            from.
+        """
+
+    def start(self) -> None:
+        """Prepare the formatter to receive input.
+
+        This defaults to initializing :attr:`output_fd` if :attr:`filename`
+        """
+        if self.filename:
+            dirname = os.path.dirname(os.path.abspath(self.filename))
+            os.makedirs(dirname, exist_ok=True)
+            self.output_fd = open(self.filename, "a")
+
+    def handle(self, error: Violation) -> None:
+        """Handle an error reported by Flake8.
+
+        This defaults to calling :meth:`format`, :meth:`show_source`, and
+        then :meth:`write`. To extend how errors are handled, override this
+        method.
+
+        :param error:
+            This will be an instance of
+            :class:`~flake8.violation.Violation`.
+        """
+        line = self.format(error)
+        source = self.show_source(error)
+        self.write(line, source)
+
+    def format(self, error: Violation) -> str | None:
+        """Format an error reported by Flake8.
+
+        This method **must** be implemented by subclasses.
+
+        :param error:
+            This will be an instance of
+            :class:`~flake8.violation.Violation`.
+        :returns:
+            The formatted error string.
+        """
+        raise NotImplementedError(
+            "Subclass of BaseFormatter did not implement" " format."
+        )
+
+    def show_statistics(self, statistics: Statistics) -> None:
+        """Format and print the statistics."""
+        for error_code in statistics.error_codes():
+            stats_for_error_code = statistics.statistics_for(error_code)
+            statistic = next(stats_for_error_code)
+            count = statistic.count
+            count += sum(stat.count for stat in stats_for_error_code)
+            self._write(f"{count:<5} {error_code} {statistic.message}")
+
+    def show_benchmarks(self, benchmarks: list[tuple[str, float]]) -> None:
+        """Format and print the benchmarks."""
+        # NOTE(sigmavirus24): The format strings are a little confusing, even
+        # to me, so here's a quick explanation:
+        # We specify the named value first followed by a ':' to indicate we're
+        # formatting the value.
+        # Next we use '<' to indicate we want the value left aligned.
+        # Then '10' is the width of the area.
+        # For floats, finally, we only want only want at most 3 digits after
+        # the decimal point to be displayed. This is the precision and it
+        # can not be specified for integers which is why we need two separate
+        # format strings.
+        float_format = "{value:<10.3} {statistic}".format
+        int_format = "{value:<10} {statistic}".format
+        for statistic, value in benchmarks:
+            if isinstance(value, int):
+                benchmark = int_format(statistic=statistic, value=value)
+            else:
+                benchmark = float_format(statistic=statistic, value=value)
+            self._write(benchmark)
+
+    def show_source(self, error: Violation) -> str | None:
+        """Show the physical line generating the error.
+
+        This also adds an indicator for the particular part of the line that
+        is reported as generating the problem.
+
+        :param error:
+            This will be an instance of
+            :class:`~flake8.violation.Violation`.
+        :returns:
+            The formatted error string if the user wants to show the source.
+            If the user does not want to show the source, this will return
+            ``None``.
+        """
+        if not self.options.show_source or error.physical_line is None:
+            return ""
+
+        # Because column numbers are 1-indexed, we need to remove one to get
+        # the proper number of space characters.
+        indent = "".join(
+            c if c.isspace() else " "
+            for c in error.physical_line[: error.column_number - 1]
+        )
+        # Physical lines have a newline at the end, no need to add an extra
+        # one
+        return f"{error.physical_line}{indent}^"
+
+    def _write(self, output: str) -> None:
+        """Handle logic of whether to use an output file or print()."""
+        if self.output_fd is not None:
+            self.output_fd.write(output + self.newline)
+        if self.output_fd is None or self.options.tee:
+            sys.stdout.buffer.write(output.encode() + self.newline.encode())
+
+    def write(self, line: str | None, source: str | None) -> None:
+        """Write the line either to the output file or stdout.
+
+        This handles deciding whether to write to a file or print to standard
+        out for subclasses. Override this if you want behaviour that differs
+        from the default.
+
+        :param line:
+            The formatted string to print or write.
+        :param source:
+            The source code that has been formatted and associated with the
+            line of output.
+        """
+        if line:
+            self._write(line)
+        if source:
+            self._write(source)
+
+    def stop(self) -> None:
+        """Clean up after reporting is finished."""
+        if self.output_fd is not None:
+            self.output_fd.close()
+            self.output_fd = None

calculator/lib/python3.12/site-packages/flake8/formatting/default.py

@@ -0,0 +1,109 @@
+"""Default formatting class for Flake8."""
+from __future__ import annotations
+
+from flake8.formatting import base
+from flake8.violation import Violation
+
+COLORS = {
+    "bold": "\033[1m",
+    "black": "\033[30m",
+    "red": "\033[31m",
+    "green": "\033[32m",
+    "yellow": "\033[33m",
+    "blue": "\033[34m",
+    "magenta": "\033[35m",
+    "cyan": "\033[36m",
+    "white": "\033[37m",
+    "reset": "\033[m",
+}
+COLORS_OFF = {k: "" for k in COLORS}
+
+
+class SimpleFormatter(base.BaseFormatter):
+    """Simple abstraction for Default and Pylint formatter commonality.
+
+    Sub-classes of this need to define an ``error_format`` attribute in order
+    to succeed. The ``format`` method relies on that attribute and expects the
+    ``error_format`` string to use the old-style formatting strings with named
+    parameters:
+
+    * code
+    * text
+    * path
+    * row
+    * col
+
+    """
+
+    error_format: str
+
+    def format(self, error: Violation) -> str | None:
+        """Format and write error out.
+
+        If an output filename is specified, write formatted errors to that
+        file. Otherwise, print the formatted error to standard out.
+        """
+        return self.error_format % {
+            "code": error.code,
+            "text": error.text,
+            "path": error.filename,
+            "row": error.line_number,
+            "col": error.column_number,
+            **(COLORS if self.color else COLORS_OFF),
+        }
+
+
+class Default(SimpleFormatter):
+    """Default formatter for Flake8.
+
+    This also handles backwards compatibility for people specifying a custom
+    format string.
+    """
+
+    error_format = (
+        "%(bold)s%(path)s%(reset)s"
+        "%(cyan)s:%(reset)s%(row)d%(cyan)s:%(reset)s%(col)d%(cyan)s:%(reset)s "
+        "%(bold)s%(red)s%(code)s%(reset)s %(text)s"
+    )
+
+    def after_init(self) -> None:
+        """Check for a custom format string."""
+        if self.options.format.lower() != "default":
+            self.error_format = self.options.format
+
+
+class Pylint(SimpleFormatter):
+    """Pylint formatter for Flake8."""
+
+    error_format = "%(path)s:%(row)d: [%(code)s] %(text)s"
+
+
+class FilenameOnly(SimpleFormatter):
+    """Only print filenames, e.g., flake8 -q."""
+
+    error_format = "%(path)s"
+
+    def after_init(self) -> None:
+        """Initialize our set of filenames."""
+        self.filenames_already_printed: set[str] = set()
+
+    def show_source(self, error: Violation) -> str | None:
+        """Do not include the source code."""
+
+    def format(self, error: Violation) -> str | None:
+        """Ensure we only print each error once."""
+        if error.filename not in self.filenames_already_printed:
+            self.filenames_already_printed.add(error.filename)
+            return super().format(error)
+        else:
+            return None
+
+
+class Nothing(base.BaseFormatter):
+    """Print absolutely nothing."""
+
+    def format(self, error: Violation) -> str | None:
+        """Do nothing."""
+
+    def show_source(self, error: Violation) -> str | None:
+        """Do not print the source."""

calculator/lib/python3.12/site-packages/flake8/main/__init__.py

@@ -0,0 +1,2 @@
+"""Module containing the logic for the Flake8 entry-points."""
+from __future__ import annotations

calculator/lib/python3.12/site-packages/flake8/main/application.py

@@ -0,0 +1,215 @@
+"""Module containing the application logic for Flake8."""
+from __future__ import annotations
+
+import argparse
+import json
+import logging
+import time
+from collections.abc import Sequence
+
+import flake8
+from flake8 import checker
+from flake8 import defaults
+from flake8 import exceptions
+from flake8 import style_guide
+from flake8.formatting.base import BaseFormatter
+from flake8.main import debug
+from flake8.options.parse_args import parse_args
+from flake8.plugins import finder
+from flake8.plugins import reporter
+
+
+LOG = logging.getLogger(__name__)
+
+
+class Application:
+    """Abstract our application into a class."""
+
+    def __init__(self) -> None:
+        """Initialize our application."""
+        #: The timestamp when the Application instance was instantiated.
+        self.start_time = time.time()
+        #: The timestamp when the Application finished reported errors.
+        self.end_time: float | None = None
+
+        self.plugins: finder.Plugins | None = None
+        #: The user-selected formatter from :attr:`formatting_plugins`
+        self.formatter: BaseFormatter | None = None
+        #: The :class:`flake8.style_guide.StyleGuideManager` built from the
+        #: user's options
+        self.guide: style_guide.StyleGuideManager | None = None
+        #: The :class:`flake8.checker.Manager` that will handle running all of
+        #: the checks selected by the user.
+        self.file_checker_manager: checker.Manager | None = None
+
+        #: The user-supplied options parsed into an instance of
+        #: :class:`argparse.Namespace`
+        self.options: argparse.Namespace | None = None
+        #: The number of errors, warnings, and other messages after running
+        #: flake8 and taking into account ignored errors and lines.
+        self.result_count = 0
+        #: The total number of errors before accounting for ignored errors and
+        #: lines.
+        self.total_result_count = 0
+        #: Whether or not something catastrophic happened and we should exit
+        #: with a non-zero status code
+        self.catastrophic_failure = False
+
+    def exit_code(self) -> int:
+        """Return the program exit code."""
+        if self.catastrophic_failure:
+            return 1
+        assert self.options is not None
+        if self.options.exit_zero:
+            return 0
+        else:
+            return int(self.result_count > 0)
+
+    def make_formatter(self) -> None:
+        """Initialize a formatter based on the parsed options."""
+        assert self.plugins is not None
+        assert self.options is not None
+        self.formatter = reporter.make(self.plugins.reporters, self.options)
+
+    def make_guide(self) -> None:
+        """Initialize our StyleGuide."""
+        assert self.formatter is not None
+        assert self.options is not None
+        self.guide = style_guide.StyleGuideManager(
+            self.options, self.formatter
+        )
+
+    def make_file_checker_manager(self, argv: Sequence[str]) -> None:
+        """Initialize our FileChecker Manager."""
+        assert self.guide is not None
+        assert self.plugins is not None
+        self.file_checker_manager = checker.Manager(
+            style_guide=self.guide,
+            plugins=self.plugins.checkers,
+            argv=argv,
+        )
+
+    def run_checks(self) -> None:
+        """Run the actual checks with the FileChecker Manager.
+
+        This method encapsulates the logic to make a
+        :class:`~flake8.checker.Manger` instance run the checks it is
+        managing.
+        """
+        assert self.file_checker_manager is not None
+
+        self.file_checker_manager.start()
+        try:
+            self.file_checker_manager.run()
+        except exceptions.PluginExecutionFailed as plugin_failed:
+            print(str(plugin_failed))
+            print("Run flake8 with greater verbosity to see more details")
+            self.catastrophic_failure = True
+        LOG.info("Finished running")
+        self.file_checker_manager.stop()
+        self.end_time = time.time()
+
+    def report_benchmarks(self) -> None:
+        """Aggregate, calculate, and report benchmarks for this run."""
+        assert self.options is not None
+        if not self.options.benchmark:
+            return
+
+        assert self.file_checker_manager is not None
+        assert self.end_time is not None
+        time_elapsed = self.end_time - self.start_time
+        statistics = [("seconds elapsed", time_elapsed)]
+        add_statistic = statistics.append
+        for statistic in defaults.STATISTIC_NAMES + ("files",):
+            value = self.file_checker_manager.statistics[statistic]
+            total_description = f"total {statistic} processed"
+            add_statistic((total_description, value))
+            per_second_description = f"{statistic} processed per second"
+            add_statistic((per_second_description, int(value / time_elapsed)))
+
+        assert self.formatter is not None
+        self.formatter.show_benchmarks(statistics)
+
+    def report_errors(self) -> None:
+        """Report all the errors found by flake8 3.0.
+
+        This also updates the :attr:`result_count` attribute with the total
+        number of errors, warnings, and other messages found.
+        """
+        LOG.info("Reporting errors")
+        assert self.file_checker_manager is not None
+        results = self.file_checker_manager.report()
+        self.total_result_count, self.result_count = results
+        LOG.info(
+            "Found a total of %d violations and reported %d",
+            self.total_result_count,
+            self.result_count,
+        )
+
+    def report_statistics(self) -> None:
+        """Aggregate and report statistics from this run."""
+        assert self.options is not None
+        if not self.options.statistics:
+            return
+
+        assert self.formatter is not None
+        assert self.guide is not None
+        self.formatter.show_statistics(self.guide.stats)
+
+    def initialize(self, argv: Sequence[str]) -> None:
+        """Initialize the application to be run.
+
+        This finds the plugins, registers their options, and parses the
+        command-line arguments.
+        """
+        self.plugins, self.options = parse_args(argv)
+
+        if self.options.bug_report:
+            info = debug.information(flake8.__version__, self.plugins)
+            print(json.dumps(info, indent=2, sort_keys=True))
+            raise SystemExit(0)
+
+        self.make_formatter()
+        self.make_guide()
+        self.make_file_checker_manager(argv)
+
+    def report(self) -> None:
+        """Report errors, statistics, and benchmarks."""
+        assert self.formatter is not None
+        self.formatter.start()
+        self.report_errors()
+        self.report_statistics()
+        self.report_benchmarks()
+        self.formatter.stop()
+
+    def _run(self, argv: Sequence[str]) -> None:
+        self.initialize(argv)
+        self.run_checks()
+        self.report()
+
+    def run(self, argv: Sequence[str]) -> None:
+        """Run our application.
+
+        This method will also handle KeyboardInterrupt exceptions for the
+        entirety of the flake8 application. If it sees a KeyboardInterrupt it
+        will forcibly clean up the :class:`~flake8.checker.Manager`.
+        """
+        try:
+            self._run(argv)
+        except KeyboardInterrupt as exc:
+            print("... stopped")
+            LOG.critical("Caught keyboard interrupt from user")
+            LOG.exception(exc)
+            self.catastrophic_failure = True
+        except exceptions.ExecutionError as exc:
+            print("There was a critical error during execution of Flake8:")
+            print(exc)
+            LOG.exception(exc)
+            self.catastrophic_failure = True
+        except exceptions.EarlyQuit:
+            self.catastrophic_failure = True
+            print("... stopped while processing files")
+        else:
+            assert self.options is not None
+            if self.options.count:
+                print(self.result_count)

calculator/lib/python3.12/site-packages/flake8/main/cli.py

@@ -0,0 +1,24 @@
+"""Command-line implementation of flake8."""
+from __future__ import annotations
+
+import sys
+from collections.abc import Sequence
+
+from flake8.main import application
+
+
+def main(argv: Sequence[str] | None = None) -> int:
+    """Execute the main bit of the application.
+
+    This handles the creation of an instance of :class:`Application`, runs it,
+    and then exits the application.
+
+    :param argv:
+        The arguments to be passed to the application for parsing.
+    """
+    if argv is None:
+        argv = sys.argv[1:]
+
+    app = application.Application()
+    app.run(argv)
+    return app.exit_code()

calculator/lib/python3.12/site-packages/flake8/main/debug.py

@@ -0,0 +1,30 @@
+"""Module containing the logic for our debugging logic."""
+from __future__ import annotations
+
+import platform
+from typing import Any
+
+from flake8.plugins.finder import Plugins
+
+
+def information(version: str, plugins: Plugins) -> dict[str, Any]:
+    """Generate the information to be printed for the bug report."""
+    versions = sorted(
+        {
+            (loaded.plugin.package, loaded.plugin.version)
+            for loaded in plugins.all_plugins()
+            if loaded.plugin.package not in {"flake8", "local"}
+        }
+    )
+    return {
+        "version": version,
+        "plugins": [
+            {"plugin": plugin, "version": version}
+            for plugin, version in versions
+        ],
+        "platform": {
+            "python_implementation": platform.python_implementation(),
+            "python_version": platform.python_version(),
+            "system": platform.system(),
+        },
+    }

calculator/lib/python3.12/site-packages/flake8/main/options.py

@@ -0,0 +1,396 @@
+"""Contains the logic for all of the default options for Flake8."""
+from __future__ import annotations
+
+import argparse
+
+from flake8 import defaults
+from flake8.options.manager import OptionManager
+
+
+def stage1_arg_parser() -> argparse.ArgumentParser:
+    """Register the preliminary options on our OptionManager.
+
+    The preliminary options include:
+
+    - ``-v``/``--verbose``
+    - ``--output-file``
+    - ``--append-config``
+    - ``--config``
+    - ``--isolated``
+    - ``--enable-extensions``
+    """
+    parser = argparse.ArgumentParser(add_help=False)
+
+    parser.add_argument(
+        "-v",
+        "--verbose",
+        default=0,
+        action="count",
+        help="Print more information about what is happening in flake8. "
+        "This option is repeatable and will increase verbosity each "
+        "time it is repeated.",
+    )
+
+    parser.add_argument(
+        "--output-file", default=None, help="Redirect report to a file."
+    )
+
+    # Config file options
+
+    parser.add_argument(
+        "--append-config",
+        action="append",
+        default=[],
+        help="Provide extra config files to parse in addition to the files "
+        "found by Flake8 by default. These files are the last ones read "
+        "and so they take the highest precedence when multiple files "
+        "provide the same option.",
+    )
+
+    parser.add_argument(
+        "--config",
+        default=None,
+        help="Path to the config file that will be the authoritative config "
+        "source. This will cause Flake8 to ignore all other "
+        "configuration files.",
+    )
+
+    parser.add_argument(
+        "--isolated",
+        default=False,
+        action="store_true",
+        help="Ignore all configuration files.",
+    )
+
+    # Plugin enablement options
+
+    parser.add_argument(
+        "--enable-extensions",
+        help="Enable plugins and extensions that are otherwise disabled "
+        "by default",
+    )
+
+    parser.add_argument(
+        "--require-plugins",
+        help="Require specific plugins to be installed before running",
+    )
+
+    return parser
+
+
+class JobsArgument:
+    """Type callback for the --jobs argument."""
+
+    def __init__(self, arg: str) -> None:
+        """Parse and validate the --jobs argument.
+
+        :param arg: The argument passed by argparse for validation
+        """
+        self.is_auto = False
+        self.n_jobs = -1
+        if arg == "auto":
+            self.is_auto = True
+        elif arg.isdigit():
+            self.n_jobs = int(arg)
+        else:
+            raise argparse.ArgumentTypeError(
+                f"{arg!r} must be 'auto' or an integer.",
+            )
+
+    def __repr__(self) -> str:
+        """Representation for debugging."""
+        return f"{type(self).__name__}({str(self)!r})"
+
+    def __str__(self) -> str:
+        """Format our JobsArgument class."""
+        return "auto" if self.is_auto else str(self.n_jobs)
+
+
+def register_default_options(option_manager: OptionManager) -> None:
+    """Register the default options on our OptionManager.
+
+    The default options include:
+
+    - ``-q``/``--quiet``
+    - ``--color``
+    - ``--count``
+    - ``--exclude``
+    - ``--extend-exclude``
+    - ``--filename``
+    - ``--format``
+    - ``--hang-closing``
+    - ``--ignore``
+    - ``--extend-ignore``
+    - ``--per-file-ignores``
+    - ``--max-line-length``
+    - ``--max-doc-length``
+    - ``--indent-size``
+    - ``--select``
+    - ``--extend-select``
+    - ``--disable-noqa``
+    - ``--show-source``
+    - ``--statistics``
+    - ``--exit-zero``
+    - ``-j``/``--jobs``
+    - ``--tee``
+    - ``--benchmark``
+    - ``--bug-report``
+    """
+    add_option = option_manager.add_option
+
+    add_option(
+        "-q",
+        "--quiet",
+        default=0,
+        action="count",
+        parse_from_config=True,
+        help="Report only file names, or nothing. This option is repeatable.",
+    )
+
+    add_option(
+        "--color",
+        choices=("auto", "always", "never"),
+        default="auto",
+        help="Whether to use color in output.  Defaults to `%(default)s`.",
+    )
+
+    add_option(
+        "--count",
+        action="store_true",
+        parse_from_config=True,
+        help="Print total number of errors to standard output after "
+        "all other output.",
+    )
+
+    add_option(
+        "--exclude",
+        metavar="patterns",
+        default=",".join(defaults.EXCLUDE),
+        comma_separated_list=True,
+        parse_from_config=True,
+        normalize_paths=True,
+        help="Comma-separated list of files or directories to exclude. "
+        "(Default: %(default)s)",
+    )
+
+    add_option(
+        "--extend-exclude",
+        metavar="patterns",
+        default="",
+        parse_from_config=True,
+        comma_separated_list=True,
+        normalize_paths=True,
+        help="Comma-separated list of files or directories to add to the list "
+        "of excluded ones.",
+    )
+
+    add_option(
+        "--filename",
+        metavar="patterns",
+        default="*.py",
+        parse_from_config=True,
+        comma_separated_list=True,
+        help="Only check for filenames matching the patterns in this comma-"
+        "separated list. (Default: %(default)s)",
+    )
+
+    add_option(
+        "--stdin-display-name",
+        default="stdin",
+        help="The name used when reporting errors from code passed via stdin. "
+        "This is useful for editors piping the file contents to flake8. "
+        "(Default: %(default)s)",
+    )
+
+    # TODO(sigmavirus24): Figure out --first/--repeat
+
+    # NOTE(sigmavirus24): We can't use choices for this option since users can
+    # freely provide a format string and that will break if we restrict their
+    # choices.
+    add_option(
+        "--format",
+        metavar="format",
+        default="default",
+        parse_from_config=True,
+        help=(
+            f"Format errors according to the chosen formatter "
+            f"({', '.join(sorted(option_manager.formatter_names))}) "
+            f"or a format string containing %%-style "
+            f"mapping keys (code, col, path, row, text). "
+            f"For example, "
+            f"``--format=pylint`` or ``--format='%%(path)s %%(code)s'``. "
+            f"(Default: %(default)s)"
+        ),
+    )
+
+    add_option(
+        "--hang-closing",
+        action="store_true",
+        parse_from_config=True,
+        help="Hang closing bracket instead of matching indentation of opening "
+        "bracket's line.",
+    )
+
+    add_option(
+        "--ignore",
+        metavar="errors",
+        parse_from_config=True,
+        comma_separated_list=True,
+        help=(
+            f"Comma-separated list of error codes to ignore (or skip). "
+            f"For example, ``--ignore=E4,E51,W234``. "
+            f"(Default: {','.join(defaults.IGNORE)})"
+        ),
+    )
+
+    add_option(
+        "--extend-ignore",
+        metavar="errors",
+        parse_from_config=True,
+        comma_separated_list=True,
+        help="Comma-separated list of error codes to add to the list of "
+        "ignored ones. For example, ``--extend-ignore=E4,E51,W234``.",
+    )
+
+    add_option(
+        "--per-file-ignores",
+        default="",
+        parse_from_config=True,
+        help="A pairing of filenames and violation codes that defines which "
+        "violations to ignore in a particular file. The filenames can be "
+        "specified in a manner similar to the ``--exclude`` option and the "
+        "violations work similarly to the ``--ignore`` and ``--select`` "
+        "options.",
+    )
+
+    add_option(
+        "--max-line-length",
+        type=int,
+        metavar="n",
+        default=defaults.MAX_LINE_LENGTH,
+        parse_from_config=True,
+        help="Maximum allowed line length for the entirety of this run. "
+        "(Default: %(default)s)",
+    )
+
+    add_option(
+        "--max-doc-length",
+        type=int,
+        metavar="n",
+        default=None,
+        parse_from_config=True,
+        help="Maximum allowed doc line length for the entirety of this run. "
+        "(Default: %(default)s)",
+    )
+    add_option(
+        "--indent-size",
+        type=int,
+        metavar="n",
+        default=defaults.INDENT_SIZE,
+        parse_from_config=True,
+        help="Number of spaces used for indentation (Default: %(default)s)",
+    )
+
+    add_option(
+        "--select",
+        metavar="errors",
+        parse_from_config=True,
+        comma_separated_list=True,
+        help=(
+            "Limit the reported error codes to codes prefix-matched by this "
+            "list.  "
+            "You usually do not need to specify this option as the default "
+            "includes all installed plugin codes.  "
+            "For example, ``--select=E4,E51,W234``."
+        ),
+    )
+
+    add_option(
+        "--extend-select",
+        metavar="errors",
+        parse_from_config=True,
+        comma_separated_list=True,
+        help=(
+            "Add additional error codes to the default ``--select``.  "
+            "You usually do not need to specify this option as the default "
+            "includes all installed plugin codes.  "
+            "For example, ``--extend-select=E4,E51,W234``."
+        ),
+    )
+
+    add_option(
+        "--disable-noqa",
+        default=False,
+        parse_from_config=True,
+        action="store_true",
+        help='Disable the effect of "# noqa". This will report errors on '
+        'lines with "# noqa" at the end.',
+    )
+
+    # TODO(sigmavirus24): Decide what to do about --show-pep8
+
+    add_option(
+        "--show-source",
+        action="store_true",
+        parse_from_config=True,
+        help="Show the source generate each error or warning.",
+    )
+    add_option(
+        "--no-show-source",
+        action="store_false",
+        dest="show_source",
+        parse_from_config=False,
+        help="Negate --show-source",
+    )
+
+    add_option(
+        "--statistics",
+        action="store_true",
+        parse_from_config=True,
+        help="Count errors.",
+    )
+
+    # Flake8 options
+
+    add_option(
+        "--exit-zero",
+        action="store_true",
+        help='Exit with status code "0" even if there are errors.',
+    )
+
+    add_option(
+        "-j",
+        "--jobs",
+        default="auto",
+        parse_from_config=True,
+        type=JobsArgument,
+        help="Number of subprocesses to use to run checks in parallel. "
+        'This is ignored on Windows. The default, "auto", will '
+        "auto-detect the number of processors available to use. "
+        "(Default: %(default)s)",
+    )
+
+    add_option(
+        "--tee",
+        default=False,
+        parse_from_config=True,
+        action="store_true",
+        help="Write to stdout and output-file.",
+    )
+
+    # Benchmarking
+
+    add_option(
+        "--benchmark",
+        default=False,
+        action="store_true",
+        help="Print benchmark information about this run of Flake8",
+    )
+
+    # Debugging
+
+    add_option(
+        "--bug-report",
+        action="store_true",
+        help="Print information necessary when preparing a bug report",
+    )

calculator/lib/python3.12/site-packages/flake8/options/__init__.py

@@ -0,0 +1,13 @@
+"""Package containing the option manager and config management logic.
+
+- :mod:`flake8.options.config` contains the logic for finding, parsing, and
+  merging configuration files.
+
+- :mod:`flake8.options.manager` contains the logic for managing customized
+  Flake8 command-line and configuration options.
+
+- :mod:`flake8.options.aggregator` uses objects from both of the above modules
+  to aggregate configuration into one object used by plugins and Flake8.
+
+"""
+from __future__ import annotations

calculator/lib/python3.12/site-packages/flake8/options/aggregator.py

@@ -0,0 +1,56 @@
+"""Aggregation function for CLI specified options and config file options.
+
+This holds the logic that uses the collected and merged config files and
+applies the user-specified command-line configuration on top of it.
+"""
+from __future__ import annotations
+
+import argparse
+import configparser
+import logging
+from collections.abc import Sequence
+
+from flake8.options import config
+from flake8.options.manager import OptionManager
+
+LOG = logging.getLogger(__name__)
+
+
+def aggregate_options(
+    manager: OptionManager,
+    cfg: configparser.RawConfigParser,
+    cfg_dir: str,
+    argv: Sequence[str] | None,
+) -> argparse.Namespace:
+    """Aggregate and merge CLI and config file options."""
+    # Get defaults from the option parser
+    default_values = manager.parse_args([])
+
+    # Get the parsed config
+    parsed_config = config.parse_config(manager, cfg, cfg_dir)
+
+    # store the plugin-set extended default ignore / select
+    default_values.extended_default_ignore = manager.extended_default_ignore
+    default_values.extended_default_select = manager.extended_default_select
+
+    # Merge values parsed from config onto the default values returned
+    for config_name, value in parsed_config.items():
+        dest_name = config_name
+        # If the config name is somehow different from the destination name,
+        # fetch the destination name from our Option
+        if not hasattr(default_values, config_name):
+            dest_val = manager.config_options_dict[config_name].dest
+            assert isinstance(dest_val, str)
+            dest_name = dest_val
+
+        LOG.debug(
+            'Overriding default value of (%s) for "%s" with (%s)',
+            getattr(default_values, dest_name, None),
+            dest_name,
+            value,
+        )
+        # Override the default values with the config values
+        setattr(default_values, dest_name, value)
+
+    # Finally parse the command-line options
+    return manager.parse_args(argv, default_values)

calculator/lib/python3.12/site-packages/flake8/options/config.py

@@ -0,0 +1,140 @@
+"""Config handling logic for Flake8."""
+from __future__ import annotations
+
+import configparser
+import logging
+import os.path
+from typing import Any
+
+from flake8 import exceptions
+from flake8.defaults import VALID_CODE_PREFIX
+from flake8.options.manager import OptionManager
+
+LOG = logging.getLogger(__name__)
+
+
+def _stat_key(s: str) -> tuple[int, int]:
+    # same as what's used by samefile / samestat
+    st = os.stat(s)
+    return st.st_ino, st.st_dev
+
+
+def _find_config_file(path: str) -> str | None:
+    # on windows if the homedir isn't detected this returns back `~`
+    home = os.path.expanduser("~")
+    try:
+        home_stat = _stat_key(home) if home != "~" else None
+    except OSError:  # FileNotFoundError / PermissionError / etc.
+        home_stat = None
+
+    dir_stat = _stat_key(path)
+    while True:
+        for candidate in ("setup.cfg", "tox.ini", ".flake8"):
+            cfg = configparser.RawConfigParser()
+            cfg_path = os.path.join(path, candidate)
+            try:
+                cfg.read(cfg_path, encoding="UTF-8")
+            except (UnicodeDecodeError, configparser.ParsingError) as e:
+                LOG.warning("ignoring unparseable config %s: %s", cfg_path, e)
+            else:
+                # only consider it a config if it contains flake8 sections
+                if "flake8" in cfg or "flake8:local-plugins" in cfg:
+                    return cfg_path
+
+        new_path = os.path.dirname(path)
+        new_dir_stat = _stat_key(new_path)
+        if new_dir_stat == dir_stat or new_dir_stat == home_stat:
+            break
+        else:
+            path = new_path
+            dir_stat = new_dir_stat
+
+    # did not find any configuration file
+    return None
+
+
+def load_config(
+    config: str | None,
+    extra: list[str],
+    *,
+    isolated: bool = False,
+) -> tuple[configparser.RawConfigParser, str]:
+    """Load the configuration given the user options.
+
+    - in ``isolated`` mode, return an empty configuration
+    - if a config file is given in ``config`` use that, otherwise attempt to
+      discover a configuration using ``tox.ini`` / ``setup.cfg`` / ``.flake8``
+    - finally, load any ``extra`` configuration files
+    """
+    pwd = os.path.abspath(".")
+
+    if isolated:
+        return configparser.RawConfigParser(), pwd
+
+    if config is None:
+        config = _find_config_file(pwd)
+
+    cfg = configparser.RawConfigParser()
+    if config is not None:
+        if not cfg.read(config, encoding="UTF-8"):
+            raise exceptions.ExecutionError(
+                f"The specified config file does not exist: {config}"
+            )
+        cfg_dir = os.path.dirname(config)
+    else:
+        cfg_dir = pwd
+
+    # TODO: remove this and replace it with configuration modifying plugins
+    # read the additional configs afterwards
+    for filename in extra:
+        if not cfg.read(filename, encoding="UTF-8"):
+            raise exceptions.ExecutionError(
+                f"The specified config file does not exist: {filename}"
+            )
+
+    return cfg, cfg_dir
+
+
+def parse_config(
+    option_manager: OptionManager,
+    cfg: configparser.RawConfigParser,
+    cfg_dir: str,
+) -> dict[str, Any]:
+    """Parse and normalize the typed configuration options."""
+    if "flake8" not in cfg:
+        return {}
+
+    config_dict = {}
+
+    for option_name in cfg["flake8"]:
+        option = option_manager.config_options_dict.get(option_name)
+        if option is None:
+            LOG.debug('Option "%s" is not registered. Ignoring.', option_name)
+            continue
+
+        # Use the appropriate method to parse the config value
+        value: Any
+        if option.type is int or option.action == "count":
+            value = cfg.getint("flake8", option_name)
+        elif option.action in {"store_true", "store_false"}:
+            value = cfg.getboolean("flake8", option_name)
+        else:
+            value = cfg.get("flake8", option_name)
+
+        LOG.debug('Option "%s" returned value: %r', option_name, value)
+
+        final_value = option.normalize(value, cfg_dir)
+
+        if option_name in {"ignore", "extend-ignore"}:
+            for error_code in final_value:
+                if not VALID_CODE_PREFIX.match(error_code):
+                    raise ValueError(
+                        f"Error code {error_code!r} "
+                        f"supplied to {option_name!r} option "
+                        f"does not match {VALID_CODE_PREFIX.pattern!r}"
+                    )
+
+        assert option.config_name is not None
+        config_dict[option.config_name] = final_value
+
+    return config_dict

calculator/lib/python3.12/site-packages/flake8/options/manager.py

@@ -0,0 +1,320 @@
+"""Option handling and Option management logic."""
+from __future__ import annotations
+
+import argparse
+import enum
+import functools
+import logging
+from collections.abc import Sequence
+from typing import Any
+from typing import Callable
+
+from flake8 import utils
+from flake8.plugins.finder import Plugins
+
+LOG = logging.getLogger(__name__)
+
+# represent a singleton of "not passed arguments".
+# an enum is chosen to trick mypy
+_ARG = enum.Enum("_ARG", "NO")
+
+
+def _flake8_normalize(
+    value: str,
+    *args: str,
+    comma_separated_list: bool = False,
+    normalize_paths: bool = False,
+) -> str | list[str]:
+    ret: str | list[str] = value
+    if comma_separated_list and isinstance(ret, str):
+        ret = utils.parse_comma_separated_list(value)
+
+    if normalize_paths:
+        if isinstance(ret, str):
+            ret = utils.normalize_path(ret, *args)
+        else:
+            ret = utils.normalize_paths(ret, *args)
+
+    return ret
+
+
+class Option:
+    """Our wrapper around an argparse argument parsers to add features."""
+
+    def __init__(
+        self,
+        short_option_name: str | _ARG = _ARG.NO,
+        long_option_name: str | _ARG = _ARG.NO,
+        # Options below are taken from argparse.ArgumentParser.add_argument
+        action: str | type[argparse.Action] | _ARG = _ARG.NO,
+        default: Any | _ARG = _ARG.NO,
+        type: Callable[..., Any] | _ARG = _ARG.NO,
+        dest: str | _ARG = _ARG.NO,
+        nargs: int | str | _ARG = _ARG.NO,
+        const: Any | _ARG = _ARG.NO,
+        choices: Sequence[Any] | _ARG = _ARG.NO,
+        help: str | _ARG = _ARG.NO,
+        metavar: str | _ARG = _ARG.NO,
+        required: bool | _ARG = _ARG.NO,
+        # Options below here are specific to Flake8
+        parse_from_config: bool = False,
+        comma_separated_list: bool = False,
+        normalize_paths: bool = False,
+    ) -> None:
+        """Initialize an Option instance.
+
+        The following are all passed directly through to argparse.
+
+        :param short_option_name:
+            The short name of the option (e.g., ``-x``). This will be the
+            first argument passed to ``ArgumentParser.add_argument``
+        :param long_option_name:
+            The long name of the option (e.g., ``--xtra-long-option``). This
+            will be the second argument passed to
+            ``ArgumentParser.add_argument``
+        :param default:
+            Default value of the option.
+        :param dest:
+            Attribute name to store parsed option value as.
+        :param nargs:
+            Number of arguments to parse for this option.
+        :param const:
+            Constant value to store on a common destination. Usually used in
+            conjunction with ``action="store_const"``.
+        :param choices:
+            Possible values for the option.
+        :param help:
+            Help text displayed in the usage information.
+        :param metavar:
+            Name to use instead of the long option name for help text.
+        :param required:
+            Whether this option is required or not.
+
+        The following options may be passed directly through to :mod:`argparse`
+        but may need some massaging.
+
+        :param type:
+            A callable to normalize the type (as is the case in
+            :mod:`argparse`).
+        :param action:
+            Any action allowed by :mod:`argparse`.
+
+        The following parameters are for Flake8's option handling alone.
+
+        :param parse_from_config:
+            Whether or not this option should be parsed out of config files.
+        :param comma_separated_list:
+            Whether the option is a comma separated list when parsing from a
+            config file.
+        :param normalize_paths:
+            Whether the option is expecting a path or list of paths and should
+            attempt to normalize the paths to absolute paths.
+        """
+        if (
+            long_option_name is _ARG.NO
+            and short_option_name is not _ARG.NO
+            and short_option_name.startswith("--")
+        ):
+            short_option_name, long_option_name = _ARG.NO, short_option_name
+
+        # flake8 special type normalization
+        if comma_separated_list or normalize_paths:
+            type = functools.partial(
+                _flake8_normalize,
+                comma_separated_list=comma_separated_list,
+                normalize_paths=normalize_paths,
+            )
+
+        self.short_option_name = short_option_name
+        self.long_option_name = long_option_name
+        self.option_args = [
+            x
+            for x in (short_option_name, long_option_name)
+            if x is not _ARG.NO
+        ]
+        self.action = action
+        self.default = default
+        self.type = type
+        self.dest = dest
+        self.nargs = nargs
+        self.const = const
+        self.choices = choices
+        self.help = help
+        self.metavar = metavar
+        self.required = required
+        self.option_kwargs: dict[str, Any | _ARG] = {
+            "action": self.action,
+            "default": self.default,
+            "type": self.type,
+            "dest": self.dest,
+            "nargs": self.nargs,
+            "const": self.const,
+            "choices": self.choices,
+            "help": self.help,
+            "metavar": self.metavar,
+            "required": self.required,
+        }
+
+        # Set our custom attributes
+        self.parse_from_config = parse_from_config
+        self.comma_separated_list = comma_separated_list
+        self.normalize_paths = normalize_paths
+
+        self.config_name: str | None = None
+        if parse_from_config:
+            if long_option_name is _ARG.NO:
+                raise ValueError(
+                    "When specifying parse_from_config=True, "
+                    "a long_option_name must also be specified."
+                )
+            self.config_name = long_option_name[2:].replace("-", "_")
+
+        self._opt = None
+
+    @property
+    def filtered_option_kwargs(self) -> dict[str, Any]:
+        """Return any actually-specified arguments."""
+        return {
+            k: v for k, v in self.option_kwargs.items() if v is not _ARG.NO
+        }
+
+    def __repr__(self) -> str:  # noqa: D105
+        parts = []
+        for arg in self.option_args:
+            parts.append(arg)
+        for k, v in self.filtered_option_kwargs.items():
+            parts.append(f"{k}={v!r}")
+        return f"Option({', '.join(parts)})"
+
+    def normalize(self, value: Any, *normalize_args: str) -> Any:
+        """Normalize the value based on the option configuration."""
+        if self.comma_separated_list and isinstance(value, str):
+            value = utils.parse_comma_separated_list(value)
+
+        if self.normalize_paths:
+            if isinstance(value, list):
+                value = utils.normalize_paths(value, *normalize_args)
+            else:
+                value = utils.normalize_path(value, *normalize_args)
+
+        return value
+
+    def to_argparse(self) -> tuple[list[str], dict[str, Any]]:
+        """Convert a Flake8 Option to argparse ``add_argument`` arguments."""
+        return self.option_args, self.filtered_option_kwargs
+
+
+class OptionManager:
+    """Manage Options and OptionParser while adding post-processing."""
+
+    def __init__(
+        self,
+        *,
+        version: str,
+        plugin_versions: str,
+        parents: list[argparse.ArgumentParser],
+        formatter_names: list[str],
+    ) -> None:
+        """Initialize an instance of an OptionManager."""
+        self.formatter_names = formatter_names
+        self.parser = argparse.ArgumentParser(
+            prog="flake8",
+            usage="%(prog)s [options] file file ...",
+            parents=parents,
+            epilog=f"Installed plugins: {plugin_versions}",
+        )
+        self.parser.add_argument(
+            "--version",
+            action="version",
+            version=(
+                f"{version} ({plugin_versions}) "
+                f"{utils.get_python_version()}"
+            ),
+        )
+        self.parser.add_argument("filenames", nargs="*", metavar="filename")
+
+        self.config_options_dict: dict[str, Option] = {}
+        self.options: list[Option] = []
+        self.extended_default_ignore: list[str] = []
+        self.extended_default_select: list[str] = []
+
+        self._current_group: argparse._ArgumentGroup | None = None
+
+    # TODO: maybe make this a free function to reduce api surface area
+    def register_plugins(self, plugins: Plugins) -> None:
+        """Register the plugin options (if needed)."""
+        groups: dict[str, argparse._ArgumentGroup] = {}
+
+        def _set_group(name: str) -> None:
+            try:
+                self._current_group = groups[name]
+            except KeyError:
+                group = self.parser.add_argument_group(name)
+                self._current_group = groups[name] = group
+
+        for loaded in plugins.all_plugins():
+            add_options = getattr(loaded.obj, "add_options", None)
+            if add_options:
+                _set_group(loaded.plugin.package)
+                add_options(self)
+
+            if loaded.plugin.entry_point.group == "flake8.extension":
+                self.extend_default_select([loaded.entry_name])
+
+        # isn't strictly necessary, but seems cleaner
+        self._current_group = None
+
+    def add_option(self, *args: Any, **kwargs: Any) -> None:
+        """Create and register a new option.
+
+        See parameters for :class:`~flake8.options.manager.Option` for
+        acceptable arguments to this method.
+
+        .. note::
+
+            ``short_option_name`` and ``long_option_name`` may be specified
+            positionally as they are with argparse normally.
+        """
+        option = Option(*args, **kwargs)
+        option_args, option_kwargs = option.to_argparse()
+        if self._current_group is not None:
+            self._current_group.add_argument(*option_args, **option_kwargs)
+        else:
+            self.parser.add_argument(*option_args, **option_kwargs)
+        self.options.append(option)
+        if option.parse_from_config:
+            name = option.config_name
+            assert name is not None
+            self.config_options_dict[name] = option
+            self.config_options_dict[name.replace("_", "-")] = option
+        LOG.debug('Registered option "%s".', option)
+
+    def extend_default_ignore(self, error_codes: Sequence[str]) -> None:
+        """Extend the default ignore list with the error codes provided.
+
+        :param error_codes:
+            List of strings that are the error/warning codes with which to
+            extend the default ignore list.
+        """
+        LOG.debug("Extending default ignore list with %r", error_codes)
+        self.extended_default_ignore.extend(error_codes)
+
+    def extend_default_select(self, error_codes: Sequence[str]) -> None:
+        """Extend the default select list with the error codes provided.
+
+        :param error_codes:
+            List of strings that are the error/warning codes with which
+            to extend the default select list.
+        """
+        LOG.debug("Extending default select list with %r", error_codes)
+        self.extended_default_select.extend(error_codes)
+
+    def parse_args(
+        self,
+        args: Sequence[str] | None = None,
+        values: argparse.Namespace | None = None,
+    ) -> argparse.Namespace:
+        """Proxy to calling the OptionParser's parse_args method."""
+        if values:
+            self.parser.set_defaults(**vars(values))
+        return self.parser.parse_args(args)

calculator/lib/python3.12/site-packages/flake8/options/parse_args.py

@@ -0,0 +1,70 @@
+"""Procedure for parsing args, config, loading plugins."""
+from __future__ import annotations
+
+import argparse
+from collections.abc import Sequence
+
+import flake8
+from flake8.main import options
+from flake8.options import aggregator
+from flake8.options import config
+from flake8.options import manager
+from flake8.plugins import finder
+
+
+def parse_args(
+    argv: Sequence[str],
+) -> tuple[finder.Plugins, argparse.Namespace]:
+    """Procedure for parsing args, config, loading plugins."""
+    prelim_parser = options.stage1_arg_parser()
+
+    args0, rest = prelim_parser.parse_known_args(argv)
+    # XXX (ericvw): Special case "forwarding" the output file option so
+    # that it can be reparsed again for the BaseFormatter.filename.
+    if args0.output_file:
+        rest.extend(("--output-file", args0.output_file))
+
+    flake8.configure_logging(args0.verbose, args0.output_file)
+
+    cfg, cfg_dir = config.load_config(
+        config=args0.config,
+        extra=args0.append_config,
+        isolated=args0.isolated,
+    )
+
+    plugin_opts = finder.parse_plugin_options(
+        cfg,
+        cfg_dir,
+        enable_extensions=args0.enable_extensions,
+        require_plugins=args0.require_plugins,
+    )
+    raw_plugins = finder.find_plugins(cfg, plugin_opts)
+    plugins = finder.load_plugins(raw_plugins, plugin_opts)
+
+    option_manager = manager.OptionManager(
+        version=flake8.__version__,
+        plugin_versions=plugins.versions_str(),
+        parents=[prelim_parser],
+        formatter_names=list(plugins.reporters),
+    )
+    options.register_default_options(option_manager)
+    option_manager.register_plugins(plugins)
+
+    opts = aggregator.aggregate_options(option_manager, cfg, cfg_dir, rest)
+
+    for loaded in plugins.all_plugins():
+        parse_options = getattr(loaded.obj, "parse_options", None)
+        if parse_options is None:
+            continue
+
+        # XXX: ideally we wouldn't have two forms of parse_options
+        try:
+            parse_options(
+                option_manager,
+                opts,
+                opts.filenames,
+            )
+        except TypeError:
+            parse_options(opts)
+
+    return plugins, opts

calculator/lib/python3.12/site-packages/flake8/plugins/__init__.py

@@ -0,0 +1,2 @@
+"""Submodule of built-in plugins and plugin managers."""
+from __future__ import annotations

calculator/lib/python3.12/site-packages/flake8/plugins/finder.py

@@ -0,0 +1,365 @@
+"""Functions related to finding and loading plugins."""
+from __future__ import annotations
+
+import configparser
+import importlib.metadata
+import inspect
+import itertools
+import logging
+import sys
+from collections.abc import Generator
+from collections.abc import Iterable
+from typing import Any
+from typing import NamedTuple
+
+from flake8 import utils
+from flake8.defaults import VALID_CODE_PREFIX
+from flake8.exceptions import ExecutionError
+from flake8.exceptions import FailedToLoadPlugin
+
+LOG = logging.getLogger(__name__)
+
+FLAKE8_GROUPS = frozenset(("flake8.extension", "flake8.report"))
+
+BANNED_PLUGINS = {
+    "flake8-colors": "5.0",
+    "flake8-per-file-ignores": "3.7",
+}
+
+
+class Plugin(NamedTuple):
+    """A plugin before loading."""
+
+    package: str
+    version: str
+    entry_point: importlib.metadata.EntryPoint
+
+
+class LoadedPlugin(NamedTuple):
+    """Represents a plugin after being imported."""
+
+    plugin: Plugin
+    obj: Any
+    parameters: dict[str, bool]
+
+    @property
+    def entry_name(self) -> str:
+        """Return the name given in the packaging metadata."""
+        return self.plugin.entry_point.name
+
+    @property
+    def display_name(self) -> str:
+        """Return the name for use in user-facing / error messages."""
+        return f"{self.plugin.package}[{self.entry_name}]"
+
+
+class Checkers(NamedTuple):
+    """Classified plugins needed for checking."""
+
+    tree: list[LoadedPlugin]
+    logical_line: list[LoadedPlugin]
+    physical_line: list[LoadedPlugin]
+
+
+class Plugins(NamedTuple):
+    """Classified plugins."""
+
+    checkers: Checkers
+    reporters: dict[str, LoadedPlugin]
+    disabled: list[LoadedPlugin]
+
+    def all_plugins(self) -> Generator[LoadedPlugin]:
+        """Return an iterator over all :class:`LoadedPlugin`s."""
+        yield from self.checkers.tree
+        yield from self.checkers.logical_line
+        yield from self.checkers.physical_line
+        yield from self.reporters.values()
+
+    def versions_str(self) -> str:
+        """Return a user-displayed list of plugin versions."""
+        return ", ".join(
+            sorted(
+                {
+                    f"{loaded.plugin.package}: {loaded.plugin.version}"
+                    for loaded in self.all_plugins()
+                    if loaded.plugin.package not in {"flake8", "local"}
+                }
+            )
+        )
+
+
+class PluginOptions(NamedTuple):
+    """Options related to plugin loading."""
+
+    local_plugin_paths: tuple[str, ...]
+    enable_extensions: frozenset[str]
+    require_plugins: frozenset[str]
+
+    @classmethod
+    def blank(cls) -> PluginOptions:
+        """Make a blank PluginOptions, mostly used for tests."""
+        return cls(
+            local_plugin_paths=(),
+            enable_extensions=frozenset(),
+            require_plugins=frozenset(),
+        )
+
+
+def _parse_option(
+    cfg: configparser.RawConfigParser,
+    cfg_opt_name: str,
+    opt: str | None,
+) -> list[str]:
+    # specified on commandline: use that
+    if opt is not None:
+        return utils.parse_comma_separated_list(opt)
+    else:
+        # ideally this would reuse our config parsing framework but we need to
+        # parse this from preliminary options before plugins are enabled
+        for opt_name in (cfg_opt_name, cfg_opt_name.replace("_", "-")):
+            val = cfg.get("flake8", opt_name, fallback=None)
+            if val is not None:
+                return utils.parse_comma_separated_list(val)
+        else:
+            return []
+
+
+def parse_plugin_options(
+    cfg: configparser.RawConfigParser,
+    cfg_dir: str,
+    *,
+    enable_extensions: str | None,
+    require_plugins: str | None,
+) -> PluginOptions:
+    """Parse plugin loading related options."""
+    paths_s = cfg.get("flake8:local-plugins", "paths", fallback="").strip()
+    paths = utils.parse_comma_separated_list(paths_s)
+    paths = utils.normalize_paths(paths, cfg_dir)
+
+    return PluginOptions(
+        local_plugin_paths=tuple(paths),
+        enable_extensions=frozenset(
+            _parse_option(cfg, "enable_extensions", enable_extensions),
+        ),
+        require_plugins=frozenset(
+            _parse_option(cfg, "require_plugins", require_plugins),
+        ),
+    )
+
+
+def _flake8_plugins(
+    eps: Iterable[importlib.metadata.EntryPoint],
+    name: str,
+    version: str,
+) -> Generator[Plugin]:
+    pyflakes_meta = importlib.metadata.distribution("pyflakes").metadata
+    pycodestyle_meta = importlib.metadata.distribution("pycodestyle").metadata
+
+    for ep in eps:
+        if ep.group not in FLAKE8_GROUPS:
+            continue
+
+        if ep.name == "F":
+            yield Plugin(pyflakes_meta["name"], pyflakes_meta["version"], ep)
+        elif ep.name in "EW":
+            # pycodestyle provides both `E` and `W` -- but our default select
+            # handles those
+            # ideally pycodestyle's plugin entrypoints would exactly represent
+            # the codes they produce...
+            yield Plugin(
+                pycodestyle_meta["name"], pycodestyle_meta["version"], ep
+            )
+        else:
+            yield Plugin(name, version, ep)
+
+
+def _find_importlib_plugins() -> Generator[Plugin]:
+    # some misconfigured pythons (RHEL) have things on `sys.path` twice
+    seen = set()
+    for dist in importlib.metadata.distributions():
+        # assigned to prevent continual reparsing
+        eps = dist.entry_points
+
+        # perf: skip parsing `.metadata` (slow) if no entry points match
+        if not any(ep.group in FLAKE8_GROUPS for ep in eps):
+            continue
+
+        # assigned to prevent continual reparsing
+        meta = dist.metadata
+
+        if meta["name"] in seen:
+            continue
+        else:
+            seen.add(meta["name"])
+
+        if meta["name"] in BANNED_PLUGINS:
+            LOG.warning(
+                "%s plugin is obsolete in flake8>=%s",
+                meta["name"],
+                BANNED_PLUGINS[meta["name"]],
+            )
+            continue
+        elif meta["name"] == "flake8":
+            # special case flake8 which provides plugins for pyflakes /
+            # pycodestyle
+            yield from _flake8_plugins(eps, meta["name"], meta["version"])
+            continue
+
+        for ep in eps:
+            if ep.group in FLAKE8_GROUPS:
+                yield Plugin(meta["name"], meta["version"], ep)
+
+
+def _find_local_plugins(
+    cfg: configparser.RawConfigParser,
+) -> Generator[Plugin]:
+    for plugin_type in ("extension", "report"):
+        group = f"flake8.{plugin_type}"
+        for plugin_s in utils.parse_comma_separated_list(
+            cfg.get("flake8:local-plugins", plugin_type, fallback="").strip(),
+            regexp=utils.LOCAL_PLUGIN_LIST_RE,
+        ):
+            name, _, entry_str = plugin_s.partition("=")
+            name, entry_str = name.strip(), entry_str.strip()
+            ep = importlib.metadata.EntryPoint(name, entry_str, group)
+            yield Plugin("local", "local", ep)
+
+
+def _check_required_plugins(
+    plugins: list[Plugin],
+    expected: frozenset[str],
+) -> None:
+    plugin_names = {
+        utils.normalize_pypi_name(plugin.package) for plugin in plugins
+    }
+    expected_names = {utils.normalize_pypi_name(name) for name in expected}
+    missing_plugins = expected_names - plugin_names
+
+    if missing_plugins:
+        raise ExecutionError(
+            f"required plugins were not installed!\n"
+            f"- installed: {', '.join(sorted(plugin_names))}\n"
+            f"- expected: {', '.join(sorted(expected_names))}\n"
+            f"- missing: {', '.join(sorted(missing_plugins))}"
+        )
+
+
+def find_plugins(
+    cfg: configparser.RawConfigParser,
+    opts: PluginOptions,
+) -> list[Plugin]:
+    """Discovers all plugins (but does not load them)."""
+    ret = [*_find_importlib_plugins(), *_find_local_plugins(cfg)]
+
+    # for determinism, sort the list
+    ret.sort()
+
+    _check_required_plugins(ret, opts.require_plugins)
+
+    return ret
+
+
+def _parameters_for(func: Any) -> dict[str, bool]:
+    """Return the parameters for the plugin.
+
+    This will inspect the plugin and return either the function parameters
+    if the plugin is a function or the parameters for ``__init__`` after
+    ``self`` if the plugin is a class.
+
+    :returns:
+        A dictionary mapping the parameter name to whether or not it is
+        required (a.k.a., is positional only/does not have a default).
+    """
+    is_class = not inspect.isfunction(func)
+    if is_class:
+        func = func.__init__
+
+    parameters = {
+        parameter.name: parameter.default is inspect.Parameter.empty
+        for parameter in inspect.signature(func).parameters.values()
+        if parameter.kind is inspect.Parameter.POSITIONAL_OR_KEYWORD
+    }
+
+    if is_class:
+        parameters.pop("self", None)
+
+    return parameters
+
+
+def _load_plugin(plugin: Plugin) -> LoadedPlugin:
+    try:
+        obj = plugin.entry_point.load()
+    except Exception as e:
+        raise FailedToLoadPlugin(plugin.package, e)
+
+    if not callable(obj):
+        err = TypeError("expected loaded plugin to be callable")
+        raise FailedToLoadPlugin(plugin.package, err)
+
+    return LoadedPlugin(plugin, obj, _parameters_for(obj))
+
+
+def _import_plugins(
+    plugins: list[Plugin],
+    opts: PluginOptions,
+) -> list[LoadedPlugin]:
+    sys.path.extend(opts.local_plugin_paths)
+    return [_load_plugin(p) for p in plugins]
+
+
+def _classify_plugins(
+    plugins: list[LoadedPlugin],
+    opts: PluginOptions,
+) -> Plugins:
+    tree = []
+    logical_line = []
+    physical_line = []
+    reporters = {}
+    disabled = []
+
+    for loaded in plugins:
+        if (
+            getattr(loaded.obj, "off_by_default", False)
+            and loaded.plugin.entry_point.name not in opts.enable_extensions
+        ):
+            disabled.append(loaded)
+        elif loaded.plugin.entry_point.group == "flake8.report":
+            reporters[loaded.entry_name] = loaded
+        elif "tree" in loaded.parameters:
+            tree.append(loaded)
+        elif "logical_line" in loaded.parameters:
+            logical_line.append(loaded)
+        elif "physical_line" in loaded.parameters:
+            physical_line.append(loaded)
+        else:
+            raise NotImplementedError(f"what plugin type? {loaded}")
+
+    for loaded in itertools.chain(tree, logical_line, physical_line):
+        if not VALID_CODE_PREFIX.match(loaded.entry_name):
+            raise ExecutionError(
+                f"plugin code for `{loaded.display_name}` does not match "
+                f"{VALID_CODE_PREFIX.pattern}"
+            )
+
+    return Plugins(
+        checkers=Checkers(
+            tree=tree,
+            logical_line=logical_line,
+            physical_line=physical_line,
+        ),
+        reporters=reporters,
+        disabled=disabled,
+    )
+
+
+def load_plugins(
+    plugins: list[Plugin],
+    opts: PluginOptions,
+) -> Plugins:
+    """Load and classify all flake8 plugins.
+
+    - first: extends ``sys.path`` with ``paths`` (to import local plugins)
+    - next: converts the ``Plugin``s to ``LoadedPlugins``
+    - finally: classifies plugins into their specific types
+    """
+    return _classify_plugins(_import_plugins(plugins, opts), opts)

calculator/lib/python3.12/site-packages/flake8/plugins/pycodestyle.py

@@ -0,0 +1,112 @@
+"""Generated using ./bin/gen-pycodestyle-plugin."""
+# fmt: off
+from __future__ import annotations
+
+from collections.abc import Generator
+from typing import Any
+
+from pycodestyle import ambiguous_identifier as _ambiguous_identifier
+from pycodestyle import bare_except as _bare_except
+from pycodestyle import blank_lines as _blank_lines
+from pycodestyle import break_after_binary_operator as _break_after_binary_operator  # noqa: E501
+from pycodestyle import break_before_binary_operator as _break_before_binary_operator  # noqa: E501
+from pycodestyle import comparison_negative as _comparison_negative
+from pycodestyle import comparison_to_singleton as _comparison_to_singleton
+from pycodestyle import comparison_type as _comparison_type
+from pycodestyle import compound_statements as _compound_statements
+from pycodestyle import continued_indentation as _continued_indentation
+from pycodestyle import explicit_line_join as _explicit_line_join
+from pycodestyle import extraneous_whitespace as _extraneous_whitespace
+from pycodestyle import imports_on_separate_lines as _imports_on_separate_lines
+from pycodestyle import indentation as _indentation
+from pycodestyle import maximum_doc_length as _maximum_doc_length
+from pycodestyle import maximum_line_length as _maximum_line_length
+from pycodestyle import missing_whitespace as _missing_whitespace
+from pycodestyle import missing_whitespace_after_keyword as _missing_whitespace_after_keyword  # noqa: E501
+from pycodestyle import module_imports_on_top_of_file as _module_imports_on_top_of_file  # noqa: E501
+from pycodestyle import python_3000_invalid_escape_sequence as _python_3000_invalid_escape_sequence  # noqa: E501
+from pycodestyle import tabs_obsolete as _tabs_obsolete
+from pycodestyle import tabs_or_spaces as _tabs_or_spaces
+from pycodestyle import trailing_blank_lines as _trailing_blank_lines
+from pycodestyle import trailing_whitespace as _trailing_whitespace
+from pycodestyle import whitespace_around_comma as _whitespace_around_comma
+from pycodestyle import whitespace_around_keywords as _whitespace_around_keywords  # noqa: E501
+from pycodestyle import whitespace_around_named_parameter_equals as _whitespace_around_named_parameter_equals  # noqa: E501
+from pycodestyle import whitespace_around_operator as _whitespace_around_operator  # noqa: E501
+from pycodestyle import whitespace_before_comment as _whitespace_before_comment
+from pycodestyle import whitespace_before_parameters as _whitespace_before_parameters  # noqa: E501
+
+
+def pycodestyle_logical(
+    blank_before: Any,
+    blank_lines: Any,
+    checker_state: Any,
+    hang_closing: Any,
+    indent_char: Any,
+    indent_level: Any,
+    indent_size: Any,
+    line_number: Any,
+    lines: Any,
+    logical_line: Any,
+    max_doc_length: Any,
+    noqa: Any,
+    previous_indent_level: Any,
+    previous_logical: Any,
+    previous_unindented_logical_line: Any,
+    tokens: Any,
+    verbose: Any,
+) -> Generator[tuple[int, str]]:
+    """Run pycodestyle logical checks."""
+    yield from _ambiguous_identifier(logical_line, tokens)
+    yield from _bare_except(logical_line, noqa)
+    yield from _blank_lines(logical_line, blank_lines, indent_level, line_number, blank_before, previous_logical, previous_unindented_logical_line, previous_indent_level, lines)  # noqa: E501
+    yield from _break_after_binary_operator(logical_line, tokens)
+    yield from _break_before_binary_operator(logical_line, tokens)
+    yield from _comparison_negative(logical_line)
+    yield from _comparison_to_singleton(logical_line, noqa)
+    yield from _comparison_type(logical_line, noqa)
+    yield from _compound_statements(logical_line)
+    yield from _continued_indentation(logical_line, tokens, indent_level, hang_closing, indent_char, indent_size, noqa, verbose)  # noqa: E501
+    yield from _explicit_line_join(logical_line, tokens)
+    yield from _extraneous_whitespace(logical_line)
+    yield from _imports_on_separate_lines(logical_line)
+    yield from _indentation(logical_line, previous_logical, indent_char, indent_level, previous_indent_level, indent_size)  # noqa: E501
+    yield from _maximum_doc_length(logical_line, max_doc_length, noqa, tokens)
+    yield from _missing_whitespace(logical_line, tokens)
+    yield from _missing_whitespace_after_keyword(logical_line, tokens)
+    yield from _module_imports_on_top_of_file(logical_line, indent_level, checker_state, noqa)  # noqa: E501
+    yield from _python_3000_invalid_escape_sequence(logical_line, tokens, noqa)
+    yield from _whitespace_around_comma(logical_line)
+    yield from _whitespace_around_keywords(logical_line)
+    yield from _whitespace_around_named_parameter_equals(logical_line, tokens)
+    yield from _whitespace_around_operator(logical_line)
+    yield from _whitespace_before_comment(logical_line, tokens)
+    yield from _whitespace_before_parameters(logical_line, tokens)
+
+
+def pycodestyle_physical(
+    indent_char: Any,
+    line_number: Any,
+    lines: Any,
+    max_line_length: Any,
+    multiline: Any,
+    noqa: Any,
+    physical_line: Any,
+    total_lines: Any,
+) -> Generator[tuple[int, str]]:
+    """Run pycodestyle physical checks."""
+    ret = _maximum_line_length(physical_line, max_line_length, multiline, line_number, noqa)  # noqa: E501
+    if ret is not None:
+        yield ret
+    ret = _tabs_obsolete(physical_line)
+    if ret is not None:
+        yield ret
+    ret = _tabs_or_spaces(physical_line, indent_char)
+    if ret is not None:
+        yield ret
+    ret = _trailing_blank_lines(physical_line, lines, line_number, total_lines)
+    if ret is not None:
+        yield ret
+    ret = _trailing_whitespace(physical_line)
+    if ret is not None:
+        yield ret

calculator/lib/python3.12/site-packages/flake8/plugins/pyflakes.py

@@ -0,0 +1,114 @@
+"""Plugin built-in to Flake8 to treat pyflakes as a plugin."""
+from __future__ import annotations
+
+import argparse
+import ast
+import logging
+from collections.abc import Generator
+from typing import Any
+
+import pyflakes.checker
+
+from flake8.options.manager import OptionManager
+
+LOG = logging.getLogger(__name__)
+
+FLAKE8_PYFLAKES_CODES = {
+    "UnusedImport": "F401",
+    "ImportShadowedByLoopVar": "F402",
+    "ImportStarUsed": "F403",
+    "LateFutureImport": "F404",
+    "ImportStarUsage": "F405",
+    "ImportStarNotPermitted": "F406",
+    "FutureFeatureNotDefined": "F407",
+    "PercentFormatInvalidFormat": "F501",
+    "PercentFormatExpectedMapping": "F502",
+    "PercentFormatExpectedSequence": "F503",
+    "PercentFormatExtraNamedArguments": "F504",
+    "PercentFormatMissingArgument": "F505",
+    "PercentFormatMixedPositionalAndNamed": "F506",
+    "PercentFormatPositionalCountMismatch": "F507",
+    "PercentFormatStarRequiresSequence": "F508",
+    "PercentFormatUnsupportedFormatCharacter": "F509",
+    "StringDotFormatInvalidFormat": "F521",
+    "StringDotFormatExtraNamedArguments": "F522",
+    "StringDotFormatExtraPositionalArguments": "F523",
+    "StringDotFormatMissingArgument": "F524",
+    "StringDotFormatMixingAutomatic": "F525",
+    "FStringMissingPlaceholders": "F541",
+    "TStringMissingPlaceholders": "F542",
+    "MultiValueRepeatedKeyLiteral": "F601",
+    "MultiValueRepeatedKeyVariable": "F602",
+    "TooManyExpressionsInStarredAssignment": "F621",
+    "TwoStarredExpressions": "F622",
+    "AssertTuple": "F631",
+    "IsLiteral": "F632",
+    "InvalidPrintSyntax": "F633",
+    "IfTuple": "F634",
+    "BreakOutsideLoop": "F701",
+    "ContinueOutsideLoop": "F702",
+    "YieldOutsideFunction": "F704",
+    "ReturnOutsideFunction": "F706",
+    "DefaultExceptNotLast": "F707",
+    "DoctestSyntaxError": "F721",
+    "ForwardAnnotationSyntaxError": "F722",
+    "RedefinedWhileUnused": "F811",
+    "UndefinedName": "F821",
+    "UndefinedExport": "F822",
+    "UndefinedLocal": "F823",
+    "UnusedIndirectAssignment": "F824",
+    "DuplicateArgument": "F831",
+    "UnusedVariable": "F841",
+    "UnusedAnnotation": "F842",
+    "RaiseNotImplemented": "F901",
+}
+
+
+class FlakesChecker(pyflakes.checker.Checker):
+    """Subclass the Pyflakes checker to conform with the flake8 API."""
+
+    with_doctest = False
+
+    def __init__(self, tree: ast.AST, filename: str) -> None:
+        """Initialize the PyFlakes plugin with an AST tree and filename."""
+        super().__init__(
+            tree, filename=filename, withDoctest=self.with_doctest
+        )
+
+    @classmethod
+    def add_options(cls, parser: OptionManager) -> None:
+        """Register options for PyFlakes on the Flake8 OptionManager."""
+        parser.add_option(
+            "--builtins",
+            parse_from_config=True,
+            comma_separated_list=True,
+            help="define more built-ins, comma separated",
+        )
+        parser.add_option(
+            "--doctests",
+            default=False,
+            action="store_true",
+            parse_from_config=True,
+            help="also check syntax of the doctests",
+        )
+
+    @classmethod
+    def parse_options(cls, options: argparse.Namespace) -> None:
+        """Parse option values from Flake8's OptionManager."""
+        if options.builtins:
+            cls.builtIns = cls.builtIns.union(options.builtins)
+        cls.with_doctest = options.doctests
+
+    def run(self) -> Generator[tuple[int, int, str, type[Any]]]:
+        """Run the plugin."""
+        for message in self.messages:
+            col = getattr(message, "col", 0)
+            yield (
+                message.lineno,
+                col,
+                "{} {}".format(
+                    FLAKE8_PYFLAKES_CODES.get(type(message).__name__, "F999"),
+                    message.message % message.message_args,
+                ),
+                message.__class__,
+            )

calculator/lib/python3.12/site-packages/flake8/plugins/reporter.py

@@ -0,0 +1,42 @@
+"""Functions for constructing the requested report plugin."""
+from __future__ import annotations
+
+import argparse
+import logging
+
+from flake8.formatting.base import BaseFormatter
+from flake8.plugins.finder import LoadedPlugin
+
+LOG = logging.getLogger(__name__)
+
+
+def make(
+    reporters: dict[str, LoadedPlugin],
+    options: argparse.Namespace,
+) -> BaseFormatter:
+    """Make the formatter from the requested user options.
+
+    - if :option:`flake8 --quiet` is specified, return the ``quiet-filename``
+      formatter.
+    - if :option:`flake8 --quiet` is specified at least twice, return the
+      ``quiet-nothing`` formatter.
+    - otherwise attempt to return the formatter by name.
+    - failing that, assume it is a format string and return the ``default``
+      formatter.
+    """
+    format_name = options.format
+    if options.quiet == 1:
+        format_name = "quiet-filename"
+    elif options.quiet >= 2:
+        format_name = "quiet-nothing"
+
+    try:
+        format_plugin = reporters[format_name]
+    except KeyError:
+        LOG.warning(
+            "%r is an unknown formatter.  Falling back to default.",
+            format_name,
+        )
+        format_plugin = reporters["default"]
+
+    return format_plugin.obj(options)

calculator/lib/python3.12/site-packages/flake8/processor.py

@@ -0,0 +1,454 @@
+"""Module containing our file processor that tokenizes a file for checks."""
+from __future__ import annotations
+
+import argparse
+import ast
+import functools
+import logging
+import tokenize
+from collections.abc import Generator
+from typing import Any
+
+from flake8 import defaults
+from flake8 import utils
+from flake8._compat import FSTRING_END
+from flake8._compat import FSTRING_MIDDLE
+from flake8._compat import TSTRING_END
+from flake8._compat import TSTRING_MIDDLE
+from flake8.plugins.finder import LoadedPlugin
+
+LOG = logging.getLogger(__name__)
+NEWLINE = frozenset([tokenize.NL, tokenize.NEWLINE])
+
+SKIP_TOKENS = frozenset(
+    [tokenize.NL, tokenize.NEWLINE, tokenize.INDENT, tokenize.DEDENT]
+)
+
+_LogicalMapping = list[tuple[int, tuple[int, int]]]
+_Logical = tuple[list[str], list[str], _LogicalMapping]
+
+
+class FileProcessor:
+    """Processes a file and holds state.
+
+    This processes a file by generating tokens, logical and physical lines,
+    and AST trees. This also provides a way of passing state about the file
+    to checks expecting that state. Any public attribute on this object can
+    be requested by a plugin. The known public attributes are:
+
+    - :attr:`blank_before`
+    - :attr:`blank_lines`
+    - :attr:`checker_state`
+    - :attr:`indent_char`
+    - :attr:`indent_level`
+    - :attr:`line_number`
+    - :attr:`logical_line`
+    - :attr:`max_line_length`
+    - :attr:`max_doc_length`
+    - :attr:`multiline`
+    - :attr:`noqa`
+    - :attr:`previous_indent_level`
+    - :attr:`previous_logical`
+    - :attr:`previous_unindented_logical_line`
+    - :attr:`tokens`
+    - :attr:`file_tokens`
+    - :attr:`total_lines`
+    - :attr:`verbose`
+    """
+
+    #: always ``False``, included for compatibility
+    noqa = False
+
+    def __init__(
+        self,
+        filename: str,
+        options: argparse.Namespace,
+        lines: list[str] | None = None,
+    ) -> None:
+        """Initialize our file processor.
+
+        :param filename: Name of the file to process
+        """
+        self.options = options
+        self.filename = filename
+        self.lines = lines if lines is not None else self.read_lines()
+        self.strip_utf_bom()
+
+        # Defaults for public attributes
+        #: Number of preceding blank lines
+        self.blank_before = 0
+        #: Number of blank lines
+        self.blank_lines = 0
+        #: Checker states for each plugin?
+        self._checker_states: dict[str, dict[Any, Any]] = {}
+        #: Current checker state
+        self.checker_state: dict[Any, Any] = {}
+        #: User provided option for hang closing
+        self.hang_closing = options.hang_closing
+        #: Character used for indentation
+        self.indent_char: str | None = None
+        #: Current level of indentation
+        self.indent_level = 0
+        #: Number of spaces used for indentation
+        self.indent_size = options.indent_size
+        #: Line number in the file
+        self.line_number = 0
+        #: Current logical line
+        self.logical_line = ""
+        #: Maximum line length as configured by the user
+        self.max_line_length = options.max_line_length
+        #: Maximum docstring / comment line length as configured by the user
+        self.max_doc_length = options.max_doc_length
+        #: Whether the current physical line is multiline
+        self.multiline = False
+        #: Previous level of indentation
+        self.previous_indent_level = 0
+        #: Previous logical line
+        self.previous_logical = ""
+        #: Previous unindented (i.e. top-level) logical line
+        self.previous_unindented_logical_line = ""
+        #: Current set of tokens
+        self.tokens: list[tokenize.TokenInfo] = []
+        #: Total number of lines in the file
+        self.total_lines = len(self.lines)
+        #: Verbosity level of Flake8
+        self.verbose = options.verbose
+        #: Statistics dictionary
+        self.statistics = {"logical lines": 0}
+        self._fstring_start = self._tstring_start = -1
+
+    @functools.cached_property
+    def file_tokens(self) -> list[tokenize.TokenInfo]:
+        """Return the complete set of tokens for a file."""
+        line_iter = iter(self.lines)
+        return list(tokenize.generate_tokens(lambda: next(line_iter)))
+
+    def fstring_start(self, lineno: int) -> None:  # pragma: >=3.12 cover
+        """Signal the beginning of an fstring."""
+        self._fstring_start = lineno
+
+    def tstring_start(self, lineno: int) -> None:  # pragma: >=3.14 cover
+        """Signal the beginning of an tstring."""
+        self._tstring_start = lineno
+
+    def multiline_string(self, token: tokenize.TokenInfo) -> Generator[str]:
+        """Iterate through the lines of a multiline string."""
+        if token.type == FSTRING_END:  # pragma: >=3.12 cover
+            start = self._fstring_start
+        elif token.type == TSTRING_END:  # pragma: >=3.14 cover
+            start = self._tstring_start
+        else:
+            start = token.start[0]
+
+        self.multiline = True
+        self.line_number = start
+        # intentionally don't include the last line, that line will be
+        # terminated later by a future end-of-line
+        for _ in range(start, token.end[0]):
+            yield self.lines[self.line_number - 1]
+            self.line_number += 1
+        self.multiline = False
+
+    def reset_blank_before(self) -> None:
+        """Reset the blank_before attribute to zero."""
+        self.blank_before = 0
+
+    def delete_first_token(self) -> None:
+        """Delete the first token in the list of tokens."""
+        del self.tokens[0]
+
+    def visited_new_blank_line(self) -> None:
+        """Note that we visited a new blank line."""
+        self.blank_lines += 1
+
+    def update_state(self, mapping: _LogicalMapping) -> None:
+        """Update the indent level based on the logical line mapping."""
+        (start_row, start_col) = mapping[0][1]
+        start_line = self.lines[start_row - 1]
+        self.indent_level = expand_indent(start_line[:start_col])
+        if self.blank_before < self.blank_lines:
+            self.blank_before = self.blank_lines
+
+    def update_checker_state_for(self, plugin: LoadedPlugin) -> None:
+        """Update the checker_state attribute for the plugin."""
+        if "checker_state" in plugin.parameters:
+            self.checker_state = self._checker_states.setdefault(
+                plugin.entry_name, {}
+            )
+
+    def next_logical_line(self) -> None:
+        """Record the previous logical line.
+
+        This also resets the tokens list and the blank_lines count.
+        """
+        if self.logical_line:
+            self.previous_indent_level = self.indent_level
+            self.previous_logical = self.logical_line
+            if not self.indent_level:
+                self.previous_unindented_logical_line = self.logical_line
+        self.blank_lines = 0
+        self.tokens = []
+
+    def build_logical_line_tokens(self) -> _Logical:  # noqa: C901
+        """Build the mapping, comments, and logical line lists."""
+        logical = []
+        comments = []
+        mapping: _LogicalMapping = []
+        length = 0
+        previous_row = previous_column = None
+        for token_type, text, start, end, line in self.tokens:
+            if token_type in SKIP_TOKENS:
+                continue
+            if not mapping:
+                mapping = [(0, start)]
+            if token_type == tokenize.COMMENT:
+                comments.append(text)
+                continue
+            if token_type == tokenize.STRING:
+                text = mutate_string(text)
+            elif token_type in {
+                FSTRING_MIDDLE,
+                TSTRING_MIDDLE,
+            }:  # pragma: >=3.12 cover  # noqa: E501
+                # A curly brace in an FSTRING_MIDDLE token must be an escaped
+                # curly brace. Both 'text' and 'end' will account for the
+                # escaped version of the token (i.e. a single brace) rather
+                # than the raw double brace version, so we must counteract this
+                brace_offset = text.count("{") + text.count("}")
+                text = "x" * (len(text) + brace_offset)
+                end = (end[0], end[1] + brace_offset)
+            if previous_row is not None and previous_column is not None:
+                (start_row, start_column) = start
+                if previous_row != start_row:
+                    row_index = previous_row - 1
+                    column_index = previous_column - 1
+                    previous_text = self.lines[row_index][column_index]
+                    if previous_text == "," or (
+                        previous_text not in "{[(" and text not in "}])"
+                    ):
+                        text = f" {text}"
+                elif previous_column != start_column:
+                    text = line[previous_column:start_column] + text
+            logical.append(text)
+            length += len(text)
+            mapping.append((length, end))
+            (previous_row, previous_column) = end
+        return comments, logical, mapping
+
+    def build_ast(self) -> ast.AST:
+        """Build an abstract syntax tree from the list of lines."""
+        return ast.parse("".join(self.lines))
+
+    def build_logical_line(self) -> tuple[str, str, _LogicalMapping]:
+        """Build a logical line from the current tokens list."""
+        comments, logical, mapping_list = self.build_logical_line_tokens()
+        joined_comments = "".join(comments)
+        self.logical_line = "".join(logical)
+        self.statistics["logical lines"] += 1
+        return joined_comments, self.logical_line, mapping_list
+
+    def keyword_arguments_for(
+        self,
+        parameters: dict[str, bool],
+        arguments: dict[str, Any],
+    ) -> dict[str, Any]:
+        """Generate the keyword arguments for a list of parameters."""
+        ret = {}
+        for param, required in parameters.items():
+            if param in arguments:
+                continue
+            try:
+                ret[param] = getattr(self, param)
+            except AttributeError:
+                if required:
+                    raise
+                else:
+                    LOG.warning(
+                        'Plugin requested optional parameter "%s" '
+                        "but this is not an available parameter.",
+                        param,
+                    )
+        return ret
+
+    def generate_tokens(self) -> Generator[tokenize.TokenInfo]:
+        """Tokenize the file and yield the tokens."""
+        for token in tokenize.generate_tokens(self.next_line):
+            if token[2][0] > self.total_lines:
+                break
+            self.tokens.append(token)
+            yield token
+
+    def _noqa_line_range(self, min_line: int, max_line: int) -> dict[int, str]:
+        line_range = range(min_line, max_line + 1)
+        joined = "".join(self.lines[min_line - 1 : max_line])
+        return dict.fromkeys(line_range, joined)
+
+    @functools.cached_property
+    def _noqa_line_mapping(self) -> dict[int, str]:
+        """Map from line number to the line we'll search for `noqa` in."""
+        try:
+            file_tokens = self.file_tokens
+        except (tokenize.TokenError, SyntaxError):
+            # if we failed to parse the file tokens, we'll always fail in
+            # the future, so set this so the code does not try again
+            return {}
+        else:
+            ret = {}
+
+            min_line = len(self.lines) + 2
+            max_line = -1
+            for tp, _, (s_line, _), (e_line, _), _ in file_tokens:
+                if tp == tokenize.ENDMARKER or tp == tokenize.DEDENT:
+                    continue
+
+                min_line = min(min_line, s_line)
+                max_line = max(max_line, e_line)
+
+                if tp in (tokenize.NL, tokenize.NEWLINE):
+                    ret.update(self._noqa_line_range(min_line, max_line))
+
+                    min_line = len(self.lines) + 2
+                    max_line = -1
+
+            return ret
+
+    def noqa_line_for(self, line_number: int) -> str | None:
+        """Retrieve the line which will be used to determine noqa."""
+        # NOTE(sigmavirus24): Some plugins choose to report errors for empty
+        # files on Line 1. In those cases, we shouldn't bother trying to
+        # retrieve a physical line (since none exist).
+        return self._noqa_line_mapping.get(line_number)
+
+    def next_line(self) -> str:
+        """Get the next line from the list."""
+        if self.line_number >= self.total_lines:
+            return ""
+        line = self.lines[self.line_number]
+        self.line_number += 1
+        if self.indent_char is None and line[:1] in defaults.WHITESPACE:
+            self.indent_char = line[0]
+        return line
+
+    def read_lines(self) -> list[str]:
+        """Read the lines for this file checker."""
+        if self.filename == "-":
+            self.filename = self.options.stdin_display_name or "stdin"
+            lines = self.read_lines_from_stdin()
+        else:
+            lines = self.read_lines_from_filename()
+        return lines
+
+    def read_lines_from_filename(self) -> list[str]:
+        """Read the lines for a file."""
+        try:
+            with tokenize.open(self.filename) as fd:
+                return fd.readlines()
+        except (SyntaxError, UnicodeError):
+            # If we can't detect the codec with tokenize.detect_encoding, or
+            # the detected encoding is incorrect, just fallback to latin-1.
+            with open(self.filename, encoding="latin-1") as fd:
+                return fd.readlines()
+
+    def read_lines_from_stdin(self) -> list[str]:
+        """Read the lines from standard in."""
+        return utils.stdin_get_lines()
+
+    def should_ignore_file(self) -> bool:
+        """Check if ``flake8: noqa`` is in the file to be ignored.
+
+        :returns:
+            True if a line matches :attr:`defaults.NOQA_FILE`,
+            otherwise False
+        """
+        if not self.options.disable_noqa and any(
+            defaults.NOQA_FILE.match(line) for line in self.lines
+        ):
+            return True
+        elif any(defaults.NOQA_FILE.search(line) for line in self.lines):
+            LOG.warning(
+                "Detected `flake8: noqa` on line with code. To ignore an "
+                "error on a line use `noqa` instead."
+            )
+            return False
+        else:
+            return False
+
+    def strip_utf_bom(self) -> None:
+        """Strip the UTF bom from the lines of the file."""
+        if not self.lines:
+            # If we have nothing to analyze quit early
+            return
+
+        # If the first byte of the file is a UTF-8 BOM, strip it
+        if self.lines[0][:1] == "\uFEFF":
+            self.lines[0] = self.lines[0][1:]
+        elif self.lines[0][:3] == "\xEF\xBB\xBF":
+            self.lines[0] = self.lines[0][3:]
+
+
+def is_eol_token(token: tokenize.TokenInfo) -> bool:
+    """Check if the token is an end-of-line token."""
+    return token[0] in NEWLINE or token[4][token[3][1] :].lstrip() == "\\\n"
+
+
+def is_multiline_string(token: tokenize.TokenInfo) -> bool:
+    """Check if this is a multiline string."""
+    return token.type in {FSTRING_END, TSTRING_END} or (
+        token.type == tokenize.STRING and "\n" in token.string
+    )
+
+
+def token_is_newline(token: tokenize.TokenInfo) -> bool:
+    """Check if the token type is a newline token type."""
+    return token[0] in NEWLINE
+
+
+def count_parentheses(current_parentheses_count: int, token_text: str) -> int:
+    """Count the number of parentheses."""
+    if token_text in "([{":  # nosec
+        return current_parentheses_count + 1
+    elif token_text in "}])":  # nosec
+        return current_parentheses_count - 1
+    return current_parentheses_count
+
+
+def expand_indent(line: str) -> int:
+    r"""Return the amount of indentation.
+
+    Tabs are expanded to the next multiple of 8.
+
+    >>> expand_indent('    ')
+    4
+    >>> expand_indent('\t')
+    8
+    >>> expand_indent('       \t')
+    8
+    >>> expand_indent('        \t')
+    16
+    """
+    return len(line.expandtabs(8))
+
+
+# NOTE(sigmavirus24): This was taken wholesale from
+# https://github.com/PyCQA/pycodestyle. The in-line comments were edited to be
+# more descriptive.
+def mutate_string(text: str) -> str:
+    """Replace contents with 'xxx' to prevent syntax matching.
+
+    >>> mutate_string('"abc"')
+    '"xxx"'
+    >>> mutate_string("'''abc'''")
+    "'''xxx'''"
+    >>> mutate_string("r'abc'")
+    "r'xxx'"
+    """
+    # NOTE(sigmavirus24): If there are string modifiers (e.g., b, u, r)
+    # use the last "character" to determine if we're using single or double
+    # quotes and then find the first instance of it
+    start = text.index(text[-1]) + 1
+    end = len(text) - 1
+    # Check for triple-quoted strings
+    if text[-3:] in ('"""', "'''"):
+        start += 2
+        end -= 2
+    return text[:start] + "x" * (end - start) + text[end:]

calculator/lib/python3.12/site-packages/flake8/statistics.py

@@ -0,0 +1,131 @@
+"""Statistic collection logic for Flake8."""
+from __future__ import annotations
+
+from collections.abc import Generator
+from typing import NamedTuple
+
+from flake8.violation import Violation
+
+
+class Statistics:
+    """Manager of aggregated statistics for a run of Flake8."""
+
+    def __init__(self) -> None:
+        """Initialize the underlying dictionary for our statistics."""
+        self._store: dict[Key, Statistic] = {}
+
+    def error_codes(self) -> list[str]:
+        """Return all unique error codes stored.
+
+        :returns:
+            Sorted list of error codes.
+        """
+        return sorted({key.code for key in self._store})
+
+    def record(self, error: Violation) -> None:
+        """Add the fact that the error was seen in the file.
+
+        :param error:
+            The Violation instance containing the information about the
+            violation.
+        """
+        key = Key.create_from(error)
+        if key not in self._store:
+            self._store[key] = Statistic.create_from(error)
+        self._store[key].increment()
+
+    def statistics_for(
+        self, prefix: str, filename: str | None = None
+    ) -> Generator[Statistic]:
+        """Generate statistics for the prefix and filename.
+
+        If you have a :class:`Statistics` object that has recorded errors,
+        you can generate the statistics for a prefix (e.g., ``E``, ``E1``,
+        ``W50``, ``W503``) with the optional filter of a filename as well.
+
+        .. code-block:: python
+
+            >>> stats = Statistics()
+            >>> stats.statistics_for('E12',
+                                     filename='src/flake8/statistics.py')
+            <generator ...>
+            >>> stats.statistics_for('W')
+            <generator ...>
+
+        :param prefix:
+            The error class or specific error code to find statistics for.
+        :param filename:
+            (Optional) The filename to further filter results by.
+        :returns:
+            Generator of instances of :class:`Statistic`
+        """
+        matching_errors = sorted(
+            key for key in self._store if key.matches(prefix, filename)
+        )
+        for error_code in matching_errors:
+            yield self._store[error_code]
+
+
+class Key(NamedTuple):
+    """Simple key structure for the Statistics dictionary.
+
+    To make things clearer, easier to read, and more understandable, we use a
+    namedtuple here for all Keys in the underlying dictionary for the
+    Statistics object.
+    """
+
+    filename: str
+    code: str
+
+    @classmethod
+    def create_from(cls, error: Violation) -> Key:
+        """Create a Key from :class:`flake8.violation.Violation`."""
+        return cls(filename=error.filename, code=error.code)
+
+    def matches(self, prefix: str, filename: str | None) -> bool:
+        """Determine if this key matches some constraints.
+
+        :param prefix:
+            The error code prefix that this key's error code should start with.
+        :param filename:
+            The filename that we potentially want to match on. This can be
+            None to only match on error prefix.
+        :returns:
+            True if the Key's code starts with the prefix and either filename
+            is None, or the Key's filename matches the value passed in.
+        """
+        return self.code.startswith(prefix) and (
+            filename is None or self.filename == filename
+        )
+
+
+class Statistic:
+    """Simple wrapper around the logic of each statistic.
+
+    Instead of maintaining a simple but potentially hard to reason about
+    tuple, we create a class which has attributes and a couple
+    convenience methods on it.
+    """
+
+    def __init__(
+        self, error_code: str, filename: str, message: str, count: int
+    ) -> None:
+        """Initialize our Statistic."""
+        self.error_code = error_code
+        self.filename = filename
+        self.message = message
+        self.count = count
+
+    @classmethod
+    def create_from(cls, error: Violation) -> Statistic:
+        """Create a Statistic from a :class:`flake8.violation.Violation`."""
+        return cls(
+            error_code=error.code,
+            filename=error.filename,
+            message=error.text,
+            count=0,
+        )
+
+    def increment(self) -> None:
+        """Increment the number of times we've seen this error in this file."""
+        self.count += 1

calculator/lib/python3.12/site-packages/flake8/style_guide.py

@@ -0,0 +1,425 @@
+"""Implementation of the StyleGuide used by Flake8."""
+from __future__ import annotations
+
+import argparse
+import contextlib
+import copy
+import enum
+import functools
+import logging
+from collections.abc import Generator
+from collections.abc import Sequence
+
+from flake8 import defaults
+from flake8 import statistics
+from flake8 import utils
+from flake8.formatting import base as base_formatter
+from flake8.violation import Violation
+
+__all__ = ("StyleGuide",)
+
+LOG = logging.getLogger(__name__)
+
+
+class Selected(enum.Enum):
+    """Enum representing an explicitly or implicitly selected code."""
+
+    Explicitly = "explicitly selected"
+    Implicitly = "implicitly selected"
+
+
+class Ignored(enum.Enum):
+    """Enum representing an explicitly or implicitly ignored code."""
+
+    Explicitly = "explicitly ignored"
+    Implicitly = "implicitly ignored"
+
+
+class Decision(enum.Enum):
+    """Enum representing whether a code should be ignored or selected."""
+
+    Ignored = "ignored error"
+    Selected = "selected error"
+
+
+def _explicitly_chosen(
+    *,
+    option: list[str] | None,
+    extend: list[str] | None,
+) -> tuple[str, ...]:
+    ret = [*(option or []), *(extend or [])]
+    return tuple(sorted(ret, reverse=True))
+
+
+def _select_ignore(
+    *,
+    option: list[str] | None,
+    default: tuple[str, ...],
+    extended_default: list[str],
+    extend: list[str] | None,
+) -> tuple[str, ...]:
+    # option was explicitly set, ignore the default and extended default
+    if option is not None:
+        ret = [*option, *(extend or [])]
+    else:
+        ret = [*default, *extended_default, *(extend or [])]
+    return tuple(sorted(ret, reverse=True))
+
+
+class DecisionEngine:
+    """A class for managing the decision process around violations.
+
+    This contains the logic for whether a violation should be reported or
+    ignored.
+    """
+
+    def __init__(self, options: argparse.Namespace) -> None:
+        """Initialize the engine."""
+        self.cache: dict[str, Decision] = {}
+
+        self.selected_explicitly = _explicitly_chosen(
+            option=options.select,
+            extend=options.extend_select,
+        )
+        self.ignored_explicitly = _explicitly_chosen(
+            option=options.ignore,
+            extend=options.extend_ignore,
+        )
+
+        self.selected = _select_ignore(
+            option=options.select,
+            default=(),
+            extended_default=options.extended_default_select,
+            extend=options.extend_select,
+        )
+        self.ignored = _select_ignore(
+            option=options.ignore,
+            default=defaults.IGNORE,
+            extended_default=options.extended_default_ignore,
+            extend=options.extend_ignore,
+        )
+
+    def was_selected(self, code: str) -> Selected | Ignored:
+        """Determine if the code has been selected by the user.
+
+        :param code: The code for the check that has been run.
+        :returns:
+            Selected.Implicitly if the selected list is empty,
+            Selected.Explicitly if the selected list is not empty and a match
+            was found,
+            Ignored.Implicitly if the selected list is not empty but no match
+            was found.
+        """
+        if code.startswith(self.selected_explicitly):
+            return Selected.Explicitly
+        elif code.startswith(self.selected):
+            return Selected.Implicitly
+        else:
+            return Ignored.Implicitly
+
+    def was_ignored(self, code: str) -> Selected | Ignored:
+        """Determine if the code has been ignored by the user.
+
+        :param code:
+            The code for the check that has been run.
+        :returns:
+            Selected.Implicitly if the ignored list is empty,
+            Ignored.Explicitly if the ignored list is not empty and a match was
+            found,
+            Selected.Implicitly if the ignored list is not empty but no match
+            was found.
+        """
+        if code.startswith(self.ignored_explicitly):
+            return Ignored.Explicitly
+        elif code.startswith(self.ignored):
+            return Ignored.Implicitly
+        else:
+            return Selected.Implicitly
+
+    def make_decision(self, code: str) -> Decision:
+        """Decide if code should be ignored or selected."""
+        selected = self.was_selected(code)
+        ignored = self.was_ignored(code)
+        LOG.debug(
+            "The user configured %r to be %r, %r",
+            code,
+            selected,
+            ignored,
+        )
+
+        if isinstance(selected, Selected) and isinstance(ignored, Selected):
+            return Decision.Selected
+        elif isinstance(selected, Ignored) and isinstance(ignored, Ignored):
+            return Decision.Ignored
+        elif (
+            selected is Selected.Explicitly
+            and ignored is not Ignored.Explicitly
+        ):
+            return Decision.Selected
+        elif (
+            selected is not Selected.Explicitly
+            and ignored is Ignored.Explicitly
+        ):
+            return Decision.Ignored
+        elif selected is Ignored.Implicitly and ignored is Selected.Implicitly:
+            return Decision.Ignored
+        elif (
+            selected is Selected.Explicitly and ignored is Ignored.Explicitly
+        ) or (
+            selected is Selected.Implicitly and ignored is Ignored.Implicitly
+        ):
+            # we only get here if it was in both lists: longest prefix wins
+            select = next(s for s in self.selected if code.startswith(s))
+            ignore = next(s for s in self.ignored if code.startswith(s))
+            if len(select) > len(ignore):
+                return Decision.Selected
+            else:
+                return Decision.Ignored
+        else:
+            raise AssertionError(f"unreachable {code} {selected} {ignored}")
+
+    def decision_for(self, code: str) -> Decision:
+        """Return the decision for a specific code.
+
+        This method caches the decisions for codes to avoid retracing the same
+        logic over and over again. We only care about the select and ignore
+        rules as specified by the user in their configuration files and
+        command-line flags.
+
+        This method does not look at whether the specific line is being
+        ignored in the file itself.
+
+        :param code: The code for the check that has been run.
+        """
+        decision = self.cache.get(code)
+        if decision is None:
+            decision = self.make_decision(code)
+            self.cache[code] = decision
+            LOG.debug('"%s" will be "%s"', code, decision)
+        return decision
+
+
+class StyleGuideManager:
+    """Manage multiple style guides for a single run."""
+
+    def __init__(
+        self,
+        options: argparse.Namespace,
+        formatter: base_formatter.BaseFormatter,
+        decider: DecisionEngine | None = None,
+    ) -> None:
+        """Initialize our StyleGuide.
+
+        .. todo:: Add parameter documentation.
+        """
+        self.options = options
+        self.formatter = formatter
+        self.stats = statistics.Statistics()
+        self.decider = decider or DecisionEngine(options)
+        self.style_guides: list[StyleGuide] = []
+        self.default_style_guide = StyleGuide(
+            options, formatter, self.stats, decider=decider
+        )
+        self.style_guides = [
+            self.default_style_guide,
+            *self.populate_style_guides_with(options),
+        ]
+
+        self.style_guide_for = functools.cache(self._style_guide_for)
+
+    def populate_style_guides_with(
+        self, options: argparse.Namespace
+    ) -> Generator[StyleGuide]:
+        """Generate style guides from the per-file-ignores option.
+
+        :param options:
+            The original options parsed from the CLI and config file.
+        :returns:
+            A copy of the default style guide with overridden values.
+        """
+        per_file = utils.parse_files_to_codes_mapping(options.per_file_ignores)
+        for filename, violations in per_file:
+            yield self.default_style_guide.copy(
+                filename=filename, extend_ignore_with=violations
+            )
+
+    def _style_guide_for(self, filename: str) -> StyleGuide:
+        """Find the StyleGuide for the filename in particular."""
+        return max(
+            (g for g in self.style_guides if g.applies_to(filename)),
+            key=lambda g: len(g.filename or ""),
+        )
+
+    @contextlib.contextmanager
+    def processing_file(self, filename: str) -> Generator[StyleGuide]:
+        """Record the fact that we're processing the file's results."""
+        guide = self.style_guide_for(filename)
+        with guide.processing_file(filename):
+            yield guide
+
+    def handle_error(
+        self,
+        code: str,
+        filename: str,
+        line_number: int,
+        column_number: int,
+        text: str,
+        physical_line: str | None = None,
+    ) -> int:
+        """Handle an error reported by a check.
+
+        :param code:
+            The error code found, e.g., E123.
+        :param filename:
+            The file in which the error was found.
+        :param line_number:
+            The line number (where counting starts at 1) at which the error
+            occurs.
+        :param column_number:
+            The column number (where counting starts at 1) at which the error
+            occurs.
+        :param text:
+            The text of the error message.
+        :param physical_line:
+            The actual physical line causing the error.
+        :returns:
+            1 if the error was reported. 0 if it was ignored. This is to allow
+            for counting of the number of errors found that were not ignored.
+        """
+        guide = self.style_guide_for(filename)
+        return guide.handle_error(
+            code, filename, line_number, column_number, text, physical_line
+        )
+
+
+class StyleGuide:
+    """Manage a Flake8 user's style guide."""
+
+    def __init__(
+        self,
+        options: argparse.Namespace,
+        formatter: base_formatter.BaseFormatter,
+        stats: statistics.Statistics,
+        filename: str | None = None,
+        decider: DecisionEngine | None = None,
+    ):
+        """Initialize our StyleGuide.
+
+        .. todo:: Add parameter documentation.
+        """
+        self.options = options
+        self.formatter = formatter
+        self.stats = stats
+        self.decider = decider or DecisionEngine(options)
+        self.filename = filename
+        if self.filename:
+            self.filename = utils.normalize_path(self.filename)
+
+    def __repr__(self) -> str:
+        """Make it easier to debug which StyleGuide we're using."""
+        return f"<StyleGuide [{self.filename}]>"
+
+    def copy(
+        self,
+        filename: str | None = None,
+        extend_ignore_with: Sequence[str] | None = None,
+    ) -> StyleGuide:
+        """Create a copy of this style guide with different values."""
+        filename = filename or self.filename
+        options = copy.deepcopy(self.options)
+        options.extend_ignore = options.extend_ignore or []
+        options.extend_ignore.extend(extend_ignore_with or [])
+        return StyleGuide(
+            options, self.formatter, self.stats, filename=filename
+        )
+
+    @contextlib.contextmanager
+    def processing_file(self, filename: str) -> Generator[StyleGuide]:
+        """Record the fact that we're processing the file's results."""
+        self.formatter.beginning(filename)
+        yield self
+        self.formatter.finished(filename)
+
+    def applies_to(self, filename: str) -> bool:
+        """Check if this StyleGuide applies to the file.
+
+        :param filename:
+            The name of the file with violations that we're potentially
+            applying this StyleGuide to.
+        :returns:
+            True if this applies, False otherwise
+        """
+        if self.filename is None:
+            return True
+        return utils.matches_filename(
+            filename,
+            patterns=[self.filename],
+            log_message=f'{self!r} does %(whether)smatch "%(path)s"',
+            logger=LOG,
+        )
+
+    def should_report_error(self, code: str) -> Decision:
+        """Determine if the error code should be reported or ignored.
+
+        This method only cares about the select and ignore rules as specified
+        by the user in their configuration files and command-line flags.
+
+        This method does not look at whether the specific line is being
+        ignored in the file itself.
+
+        :param code:
+            The code for the check that has been run.
+        """
+        return self.decider.decision_for(code)
+
+    def handle_error(
+        self,
+        code: str,
+        filename: str,
+        line_number: int,
+        column_number: int,
+        text: str,
+        physical_line: str | None = None,
+    ) -> int:
+        """Handle an error reported by a check.
+
+        :param code:
+            The error code found, e.g., E123.
+        :param filename:
+            The file in which the error was found.
+        :param line_number:
+            The line number (where counting starts at 1) at which the error
+            occurs.
+        :param column_number:
+            The column number (where counting starts at 1) at which the error
+            occurs.
+        :param text:
+            The text of the error message.
+        :param physical_line:
+            The actual physical line causing the error.
+        :returns:
+            1 if the error was reported. 0 if it was ignored. This is to allow
+            for counting of the number of errors found that were not ignored.
+        """
+        disable_noqa = self.options.disable_noqa
+        # NOTE(sigmavirus24): Apparently we're provided with 0-indexed column
+        # numbers so we have to offset that here.
+        if not column_number:
+            column_number = 0
+        error = Violation(
+            code,
+            filename,
+            line_number,
+            column_number + 1,
+            text,
+            physical_line,
+        )
+        error_is_selected = (
+            self.should_report_error(error.code) is Decision.Selected
+        )
+        is_not_inline_ignored = error.is_inline_ignored(disable_noqa) is False
+        if error_is_selected and is_not_inline_ignored:
+            self.formatter.handle(error)
+            self.stats.record(error)
+            return 1
+        return 0

calculator/lib/python3.12/site-packages/flake8/utils.py

@@ -0,0 +1,280 @@
+"""Utility methods for flake8."""
+from __future__ import annotations
+
+import fnmatch as _fnmatch
+import functools
+import io
+import logging
+import os
+import platform
+import re
+import sys
+import textwrap
+import tokenize
+from collections.abc import Sequence
+from re import Pattern
+from typing import NamedTuple
+
+from flake8 import exceptions
+
+COMMA_SEPARATED_LIST_RE = re.compile(r"[,\s]")
+LOCAL_PLUGIN_LIST_RE = re.compile(r"[,\t\n\r\f\v]")
+NORMALIZE_PACKAGE_NAME_RE = re.compile(r"[-_.]+")
+
+
+def parse_comma_separated_list(
+    value: str, regexp: Pattern[str] = COMMA_SEPARATED_LIST_RE
+) -> list[str]:
+    """Parse a comma-separated list.
+
+    :param value:
+        String to be parsed and normalized.
+    :param regexp:
+        Compiled regular expression used to split the value when it is a
+        string.
+    :returns:
+        List of values with whitespace stripped.
+    """
+    assert isinstance(value, str), value
+
+    separated = regexp.split(value)
+    item_gen = (item.strip() for item in separated)
+    return [item for item in item_gen if item]
+
+
+class _Token(NamedTuple):
+    tp: str
+    src: str
+
+
+_CODE, _FILE, _COLON, _COMMA, _WS = "code", "file", "colon", "comma", "ws"
+_EOF = "eof"
+_FILE_LIST_TOKEN_TYPES = [
+    (re.compile(r"[A-Z]+[0-9]*(?=$|\s|,)"), _CODE),
+    (re.compile(r"[^\s:,]+"), _FILE),
+    (re.compile(r"\s*:\s*"), _COLON),
+    (re.compile(r"\s*,\s*"), _COMMA),
+    (re.compile(r"\s+"), _WS),
+]
+
+
+def _tokenize_files_to_codes_mapping(value: str) -> list[_Token]:
+    tokens = []
+    i = 0
+    while i < len(value):
+        for token_re, token_name in _FILE_LIST_TOKEN_TYPES:
+            match = token_re.match(value, i)
+            if match:
+                tokens.append(_Token(token_name, match.group().strip()))
+                i = match.end()
+                break
+        else:
+            raise AssertionError("unreachable", value, i)
+    tokens.append(_Token(_EOF, ""))
+
+    return tokens
+
+
+def parse_files_to_codes_mapping(  # noqa: C901
+    value_: Sequence[str] | str,
+) -> list[tuple[str, list[str]]]:
+    """Parse a files-to-codes mapping.
+
+    A files-to-codes mapping a sequence of values specified as
+    `filenames list:codes list ...`.  Each of the lists may be separated by
+    either comma or whitespace tokens.
+
+    :param value: String to be parsed and normalized.
+    """
+    if not isinstance(value_, str):
+        value = "\n".join(value_)
+    else:
+        value = value_
+
+    ret: list[tuple[str, list[str]]] = []
+    if not value.strip():
+        return ret
+
+    class State:
+        seen_sep = True
+        seen_colon = False
+        filenames: list[str] = []
+        codes: list[str] = []
+
+    def _reset() -> None:
+        if State.codes:
+            for filename in State.filenames:
+                ret.append((filename, State.codes))
+        State.seen_sep = True
+        State.seen_colon = False
+        State.filenames = []
+        State.codes = []
+
+    def _unexpected_token() -> exceptions.ExecutionError:
+        return exceptions.ExecutionError(
+            f"Expected `per-file-ignores` to be a mapping from file exclude "
+            f"patterns to ignore codes.\n\n"
+            f"Configured `per-file-ignores` setting:\n\n"
+            f"{textwrap.indent(value.strip(), '    ')}"
+        )
+
+    for token in _tokenize_files_to_codes_mapping(value):
+        # legal in any state: separator sets the sep bit
+        if token.tp in {_COMMA, _WS}:
+            State.seen_sep = True
+        # looking for filenames
+        elif not State.seen_colon:
+            if token.tp == _COLON:
+                State.seen_colon = True
+                State.seen_sep = True
+            elif State.seen_sep and token.tp == _FILE:
+                State.filenames.append(token.src)
+                State.seen_sep = False
+            else:
+                raise _unexpected_token()
+        # looking for codes
+        else:
+            if token.tp == _EOF:
+                _reset()
+            elif State.seen_sep and token.tp == _CODE:
+                State.codes.append(token.src)
+                State.seen_sep = False
+            elif State.seen_sep and token.tp == _FILE:
+                _reset()
+                State.filenames.append(token.src)
+                State.seen_sep = False
+            else:
+                raise _unexpected_token()
+
+    return ret
+
+
+def normalize_paths(
+    paths: Sequence[str], parent: str = os.curdir
+) -> list[str]:
+    """Normalize a list of paths relative to a parent directory.
+
+    :returns:
+        The normalized paths.
+    """
+    assert isinstance(paths, list), paths
+    return [normalize_path(p, parent) for p in paths]
+
+
+def normalize_path(path: str, parent: str = os.curdir) -> str:
+    """Normalize a single-path.
+
+    :returns:
+        The normalized path.
+    """
+    # NOTE(sigmavirus24): Using os.path.sep and os.path.altsep allow for
+    # Windows compatibility with both Windows-style paths (c:\foo\bar) and
+    # Unix style paths (/foo/bar).
+    separator = os.path.sep
+    # NOTE(sigmavirus24): os.path.altsep may be None
+    alternate_separator = os.path.altsep or ""
+    if (
+        path == "."
+        or separator in path
+        or (alternate_separator and alternate_separator in path)
+    ):
+        path = os.path.abspath(os.path.join(parent, path))
+    return path.rstrip(separator + alternate_separator)
+
+
+@functools.lru_cache(maxsize=1)
+def stdin_get_value() -> str:
+    """Get and cache it so plugins can use it."""
+    stdin_value = sys.stdin.buffer.read()
+    fd = io.BytesIO(stdin_value)
+    try:
+        coding, _ = tokenize.detect_encoding(fd.readline)
+        fd.seek(0)
+        return io.TextIOWrapper(fd, coding).read()
+    except (LookupError, SyntaxError, UnicodeError):
+        return stdin_value.decode("utf-8")
+
+
+def stdin_get_lines() -> list[str]:
+    """Return lines of stdin split according to file splitting."""
+    return list(io.StringIO(stdin_get_value()))
+
+
+def is_using_stdin(paths: list[str]) -> bool:
+    """Determine if we're going to read from stdin.
+
+    :param paths:
+        The paths that we're going to check.
+    :returns:
+        True if stdin (-) is in the path, otherwise False
+    """
+    return "-" in paths
+
+
+def fnmatch(filename: str, patterns: Sequence[str]) -> bool:
+    """Wrap :func:`fnmatch.fnmatch` to add some functionality.
+
+    :param filename:
+        Name of the file we're trying to match.
+    :param patterns:
+        Patterns we're using to try to match the filename.
+    :param default:
+        The default value if patterns is empty
+    :returns:
+        True if a pattern matches the filename, False if it doesn't.
+        ``True`` if patterns is empty.
+    """
+    if not patterns:
+        return True
+    return any(_fnmatch.fnmatch(filename, pattern) for pattern in patterns)
+
+
+def matches_filename(
+    path: str,
+    patterns: Sequence[str],
+    log_message: str,
+    logger: logging.Logger,
+) -> bool:
+    """Use fnmatch to discern if a path exists in patterns.
+
+    :param path:
+        The path to the file under question
+    :param patterns:
+        The patterns to match the path against.
+    :param log_message:
+        The message used for logging purposes.
+    :returns:
+        True if path matches patterns, False otherwise
+    """
+    if not patterns:
+        return False
+    basename = os.path.basename(path)
+    if basename not in {".", ".."} and fnmatch(basename, patterns):
+        logger.debug(log_message, {"path": basename, "whether": ""})
+        return True
+
+    absolute_path = os.path.abspath(path)
+    match = fnmatch(absolute_path, patterns)
+    logger.debug(
+        log_message,
+        {"path": absolute_path, "whether": "" if match else "not "},
+    )
+    return match
+
+
+def get_python_version() -> str:
+    """Find and format the python implementation and version.
+
+    :returns:
+        Implementation name, version, and platform as a string.
+    """
+    return "{} {} on {}".format(
+        platform.python_implementation(),
+        platform.python_version(),
+        platform.system(),
+    )
+
+
+def normalize_pypi_name(s: str) -> str:
+    """Normalize a distribution name according to PEP 503."""
+    return NORMALIZE_PACKAGE_NAME_RE.sub("-", s).lower()

calculator/lib/python3.12/site-packages/flake8/violation.py

@@ -0,0 +1,69 @@
+"""Contains the Violation error class used internally."""
+from __future__ import annotations
+
+import functools
+import linecache
+import logging
+from re import Match
+from typing import NamedTuple
+
+from flake8 import defaults
+from flake8 import utils
+
+
+LOG = logging.getLogger(__name__)
+
+
+@functools.lru_cache(maxsize=512)
+def _find_noqa(physical_line: str) -> Match[str] | None:
+    return defaults.NOQA_INLINE_REGEXP.search(physical_line)
+
+
+class Violation(NamedTuple):
+    """Class representing a violation reported by Flake8."""
+
+    code: str
+    filename: str
+    line_number: int
+    column_number: int
+    text: str
+    physical_line: str | None
+
+    def is_inline_ignored(self, disable_noqa: bool) -> bool:
+        """Determine if a comment has been added to ignore this line.
+
+        :param disable_noqa:
+            Whether or not users have provided ``--disable-noqa``.
+        :returns:
+            True if error is ignored in-line, False otherwise.
+        """
+        physical_line = self.physical_line
+        # TODO(sigmavirus24): Determine how to handle stdin with linecache
+        if disable_noqa:
+            return False
+
+        if physical_line is None:
+            physical_line = linecache.getline(self.filename, self.line_number)
+        noqa_match = _find_noqa(physical_line)
+        if noqa_match is None:
+            LOG.debug("%r is not inline ignored", self)
+            return False
+
+        codes_str = noqa_match.groupdict()["codes"]
+        if codes_str is None:
+            LOG.debug("%r is ignored by a blanket ``# noqa``", self)
+            return True
+
+        codes = set(utils.parse_comma_separated_list(codes_str))
+        if self.code in codes or self.code.startswith(tuple(codes)):
+            LOG.debug(
+                "%r is ignored specifically inline with ``# noqa: %s``",
+                self,
+                codes_str,
+            )
+            return True
+
+        LOG.debug(
+            "%r is not ignored inline with ``# noqa: %s``", self, codes_str
+        )
+        return False