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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt

"""Determine contexts for coverage.py"""

from __future__ import annotations

from types import FrameType
from typing import cast, Callable, Optional, Sequence


def combine_context_switchers(
    context_switchers: Sequence[Callable[[FrameType], Optional[str]]],
) -> Optional[Callable[[FrameType], Optional[str]]]:
    """Create a single context switcher from multiple switchers.

    `context_switchers` is a list of functions that take a frame as an
    argument and return a string to use as the new context label.

    Returns a function that composites `context_switchers` functions, or None
    if `context_switchers` is an empty list.

    When invoked, the combined switcher calls `context_switchers` one-by-one
    until a string is returned.  The combined switcher returns None if all
    `context_switchers` return None.
    """
    if not context_switchers:
        return None

    if len(context_switchers) == 1:
        return context_switchers[0]

    def should_start_context(frame: FrameType) -> Optional[str]:
        """The combiner for multiple context switchers."""
        for switcher in context_switchers:
            new_context = switcher(frame)
            if new_context is not None:
                return new_context
        return None

    return should_start_context


def should_start_context_test_function(frame: FrameType) -> Optional[str]:
    """Is this frame calling a test_* function?"""
    co_name = frame.f_code.co_name
    if co_name.startswith("test") or co_name == "runTest":
        return qualname_from_frame(frame)
    return None


def qualname_from_frame(frame: FrameType) -> Optional[str]:
    """Get a qualified name for the code running in `frame`."""
    co = frame.f_code
    fname = co.co_name
    method = None
    if co.co_argcount and co.co_varnames[0] == "self":
        self = frame.f_locals.get("self", None)
        method = getattr(self, fname, None)

    if method is None:
        func = frame.f_globals.get(fname)
        if func is None:
            return None
        return cast(str, func.__module__ + "." + fname)

    func = getattr(method, "__func__", None)
    if func is None:
        cls = self.__class__
        return cast(str, cls.__module__ + "." + cls.__name__ + "." + fname)

    return cast(str, func.__module__ + "." + func.__qualname__)