forked from bton/matekasse
165 lines
5.9 KiB
Python
165 lines
5.9 KiB
Python
# 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 facts about the environment."""
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from __future__ import annotations
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import os
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import platform
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import sys
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from typing import Any, Iterable, Tuple
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# debug_info() at the bottom wants to show all the globals, but not imports.
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# Grab the global names here to know which names to not show. Nothing defined
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# above this line will be in the output.
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_UNINTERESTING_GLOBALS = list(globals())
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# These names also shouldn't be shown.
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_UNINTERESTING_GLOBALS += ["PYBEHAVIOR", "debug_info"]
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# Operating systems.
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WINDOWS = sys.platform == "win32"
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LINUX = sys.platform.startswith("linux")
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OSX = sys.platform == "darwin"
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# Python implementations.
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CPYTHON = (platform.python_implementation() == "CPython")
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PYPY = (platform.python_implementation() == "PyPy")
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# Python versions. We amend version_info with one more value, a zero if an
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# official version, or 1 if built from source beyond an official version.
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PYVERSION = sys.version_info + (int(platform.python_version()[-1] == "+"),)
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if PYPY:
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PYPYVERSION = sys.pypy_version_info # type: ignore[attr-defined]
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# Python behavior.
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class PYBEHAVIOR:
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"""Flags indicating this Python's behavior."""
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# Does Python conform to PEP626, Precise line numbers for debugging and other tools.
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# https://www.python.org/dev/peps/pep-0626
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pep626 = (PYVERSION > (3, 10, 0, "alpha", 4))
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# Is "if __debug__" optimized away?
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optimize_if_debug = not pep626
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# Is "if not __debug__" optimized away? The exact details have changed
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# across versions.
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if pep626:
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optimize_if_not_debug = 1
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elif PYPY:
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if PYVERSION >= (3, 9):
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optimize_if_not_debug = 2
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elif PYVERSION[:2] == (3, 8):
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optimize_if_not_debug = 3
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else:
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optimize_if_not_debug = 1
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else:
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if PYVERSION >= (3, 8, 0, "beta", 1):
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optimize_if_not_debug = 2
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else:
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optimize_if_not_debug = 1
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# Can co_lnotab have negative deltas?
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negative_lnotab = not (PYPY and PYPYVERSION < (7, 2))
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# 3.7 changed how functions with only docstrings are numbered.
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docstring_only_function = (not PYPY) and ((3, 7, 0, "beta", 5) <= PYVERSION <= (3, 10))
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# When a break/continue/return statement in a try block jumps to a finally
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# block, does the finally block do the break/continue/return (pre-3.8), or
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# does the finally jump back to the break/continue/return (3.8) to do the
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# work?
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finally_jumps_back = ((3, 8) <= PYVERSION < (3, 10))
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if PYPY and PYPYVERSION < (7, 3, 7):
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finally_jumps_back = False
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# When a function is decorated, does the trace function get called for the
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# @-line and also the def-line (new behavior in 3.8)? Or just the @-line
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# (old behavior)?
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trace_decorated_def = (
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(PYVERSION >= (3, 8)) and
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(CPYTHON or (PYVERSION > (3, 8)) or (PYPYVERSION > (7, 3, 9)))
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)
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# Functions are no longer claimed to start at their earliest decorator even though
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# the decorators are traced?
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def_ast_no_decorator = (PYPY and PYVERSION >= (3, 9))
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# CPython 3.11 now jumps to the decorator line again while executing
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# the decorator.
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trace_decorator_line_again = (CPYTHON and PYVERSION > (3, 11, 0, "alpha", 3, 0))
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# Are while-true loops optimized into absolute jumps with no loop setup?
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nix_while_true = (PYVERSION >= (3, 8))
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# CPython 3.9a1 made sys.argv[0] and other reported files absolute paths.
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report_absolute_files = (
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(CPYTHON or (PYPY and PYPYVERSION >= (7, 3, 10)))
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and PYVERSION >= (3, 9)
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)
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# Lines after break/continue/return/raise are no longer compiled into the
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# bytecode. They used to be marked as missing, now they aren't executable.
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omit_after_jump = (
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pep626
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or (PYPY and PYVERSION >= (3, 9) and PYPYVERSION >= (7, 3, 12))
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)
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# PyPy has always omitted statements after return.
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omit_after_return = omit_after_jump or PYPY
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# Optimize away unreachable try-else clauses.
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optimize_unreachable_try_else = pep626
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# Modules used to have firstlineno equal to the line number of the first
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# real line of code. Now they always start at 1.
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module_firstline_1 = pep626
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# Are "if 0:" lines (and similar) kept in the compiled code?
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keep_constant_test = pep626
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# When leaving a with-block, do we visit the with-line again for the exit?
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exit_through_with = (PYVERSION >= (3, 10, 0, "beta"))
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# Match-case construct.
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match_case = (PYVERSION >= (3, 10))
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# Some words are keywords in some places, identifiers in other places.
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soft_keywords = (PYVERSION >= (3, 10))
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# Modules start with a line numbered zero. This means empty modules have
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# only a 0-number line, which is ignored, giving a truly empty module.
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empty_is_empty = (PYVERSION >= (3, 11, 0, "beta", 4))
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# Are comprehensions inlined (new) or compiled as called functions (old)?
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# Changed in https://github.com/python/cpython/pull/101441
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comprehensions_are_functions = (PYVERSION <= (3, 12, 0, "alpha", 7, 0))
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# Coverage.py specifics.
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# Are we using the C-implemented trace function?
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C_TRACER = os.getenv("COVERAGE_TEST_TRACER", "c") == "c"
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# Are we coverage-measuring ourselves?
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METACOV = os.getenv("COVERAGE_COVERAGE", "") != ""
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# Are we running our test suite?
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# Even when running tests, you can use COVERAGE_TESTING=0 to disable the
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# test-specific behavior like AST checking.
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TESTING = os.getenv("COVERAGE_TESTING", "") == "True"
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def debug_info() -> Iterable[Tuple[str, Any]]:
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"""Return a list of (name, value) pairs for printing debug information."""
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info = [
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(name, value) for name, value in globals().items()
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if not name.startswith("_") and name not in _UNINTERESTING_GLOBALS
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]
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info += [
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(name, value) for name, value in PYBEHAVIOR.__dict__.items()
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if not name.startswith("_")
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]
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return sorted(info)
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