73 lines
2.4 KiB
Python
73 lines
2.4 KiB
Python
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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
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# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
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"""Determine contexts for coverage.py"""
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from __future__ import annotations
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from types import FrameType
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from typing import cast, Callable, Optional, Sequence
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def combine_context_switchers(
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context_switchers: Sequence[Callable[[FrameType], Optional[str]]],
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) -> Optional[Callable[[FrameType], Optional[str]]]:
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"""Create a single context switcher from multiple switchers.
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`context_switchers` is a list of functions that take a frame as an
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argument and return a string to use as the new context label.
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Returns a function that composites `context_switchers` functions, or None
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if `context_switchers` is an empty list.
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When invoked, the combined switcher calls `context_switchers` one-by-one
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until a string is returned. The combined switcher returns None if all
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`context_switchers` return None.
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"""
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if not context_switchers:
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return None
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if len(context_switchers) == 1:
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return context_switchers[0]
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def should_start_context(frame: FrameType) -> Optional[str]:
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"""The combiner for multiple context switchers."""
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for switcher in context_switchers:
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new_context = switcher(frame)
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if new_context is not None:
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return new_context
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return None
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return should_start_context
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def should_start_context_test_function(frame: FrameType) -> Optional[str]:
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"""Is this frame calling a test_* function?"""
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co_name = frame.f_code.co_name
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if co_name.startswith("test") or co_name == "runTest":
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return qualname_from_frame(frame)
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return None
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def qualname_from_frame(frame: FrameType) -> Optional[str]:
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"""Get a qualified name for the code running in `frame`."""
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co = frame.f_code
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fname = co.co_name
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method = None
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if co.co_argcount and co.co_varnames[0] == "self":
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self = frame.f_locals.get("self", None)
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method = getattr(self, fname, None)
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if method is None:
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func = frame.f_globals.get(fname)
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if func is None:
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return None
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return cast(str, func.__module__ + "." + fname)
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func = getattr(method, "__func__", None)
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if func is None:
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cls = self.__class__
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return cast(str, cls.__module__ + "." + cls.__name__ + "." + fname)
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return cast(str, func.__module__ + "." + func.__qualname__)
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