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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__)