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author | nkozlovskiy <nmk@ydb.tech> | 2023-09-29 12:24:06 +0300 |
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committer | nkozlovskiy <nmk@ydb.tech> | 2023-09-29 12:41:34 +0300 |
commit | e0e3e1717e3d33762ce61950504f9637a6e669ed (patch) | |
tree | bca3ff6939b10ed60c3d5c12439963a1146b9711 /contrib/python/pytest/py3/_pytest/compat.py | |
parent | 38f2c5852db84c7b4d83adfcb009eb61541d1ccd (diff) | |
download | ydb-e0e3e1717e3d33762ce61950504f9637a6e669ed.tar.gz |
add ydb deps
Diffstat (limited to 'contrib/python/pytest/py3/_pytest/compat.py')
-rw-r--r-- | contrib/python/pytest/py3/_pytest/compat.py | 426 |
1 files changed, 426 insertions, 0 deletions
diff --git a/contrib/python/pytest/py3/_pytest/compat.py b/contrib/python/pytest/py3/_pytest/compat.py new file mode 100644 index 0000000000..a1f9d37722 --- /dev/null +++ b/contrib/python/pytest/py3/_pytest/compat.py @@ -0,0 +1,426 @@ +"""Python version compatibility code.""" +from __future__ import annotations + +import dataclasses +import enum +import functools +import inspect +import os +import sys +from inspect import Parameter +from inspect import signature +from pathlib import Path +from typing import Any +from typing import Callable +from typing import Generic +from typing import NoReturn +from typing import TYPE_CHECKING +from typing import TypeVar + +import _pytest._py.path as py_path + +# fmt: off +# Workaround for https://github.com/sphinx-doc/sphinx/issues/10351. +# If `overload` is imported from `compat` instead of from `typing`, +# Sphinx doesn't recognize it as `overload` and the API docs for +# overloaded functions look good again. But type checkers handle +# it fine. +# fmt: on +if True: + from typing import overload as overload + +if TYPE_CHECKING: + from typing_extensions import Final + + +_T = TypeVar("_T") +_S = TypeVar("_S") + +#: constant to prepare valuing pylib path replacements/lazy proxies later on +# intended for removal in pytest 8.0 or 9.0 + +# fmt: off +# intentional space to create a fake difference for the verification +LEGACY_PATH = py_path. local +# fmt: on + + +def legacy_path(path: str | os.PathLike[str]) -> LEGACY_PATH: + """Internal wrapper to prepare lazy proxies for legacy_path instances""" + return LEGACY_PATH(path) + + +# fmt: off +# Singleton type for NOTSET, as described in: +# https://www.python.org/dev/peps/pep-0484/#support-for-singleton-types-in-unions +class NotSetType(enum.Enum): + token = 0 +NOTSET: Final = NotSetType.token # noqa: E305 +# fmt: on + +if sys.version_info >= (3, 8): + import importlib.metadata + + importlib_metadata = importlib.metadata +else: + import importlib_metadata as importlib_metadata # noqa: F401 + + +def _format_args(func: Callable[..., Any]) -> str: + return str(signature(func)) + + +def is_generator(func: object) -> bool: + genfunc = inspect.isgeneratorfunction(func) + return genfunc and not iscoroutinefunction(func) + + +def iscoroutinefunction(func: object) -> bool: + """Return True if func is a coroutine function (a function defined with async + def syntax, and doesn't contain yield), or a function decorated with + @asyncio.coroutine. + + Note: copied and modified from Python 3.5's builtin couroutines.py to avoid + importing asyncio directly, which in turns also initializes the "logging" + module as a side-effect (see issue #8). + """ + return inspect.iscoroutinefunction(func) or getattr(func, "_is_coroutine", False) + + +def is_async_function(func: object) -> bool: + """Return True if the given function seems to be an async function or + an async generator.""" + return iscoroutinefunction(func) or inspect.isasyncgenfunction(func) + + +def getlocation(function, curdir: str | None = None) -> str: + function = get_real_func(function) + fn = Path(inspect.getfile(function)) + lineno = function.__code__.co_firstlineno + if curdir is not None: + try: + relfn = fn.relative_to(curdir) + except ValueError: + pass + else: + return "%s:%d" % (relfn, lineno + 1) + return "%s:%d" % (fn, lineno + 1) + + +def num_mock_patch_args(function) -> int: + """Return number of arguments used up by mock arguments (if any).""" + patchings = getattr(function, "patchings", None) + if not patchings: + return 0 + + mock_sentinel = getattr(sys.modules.get("mock"), "DEFAULT", object()) + ut_mock_sentinel = getattr(sys.modules.get("unittest.mock"), "DEFAULT", object()) + + return len( + [ + p + for p in patchings + if not p.attribute_name + and (p.new is mock_sentinel or p.new is ut_mock_sentinel) + ] + ) + + +def getfuncargnames( + function: Callable[..., Any], + *, + name: str = "", + is_method: bool = False, + cls: type | None = None, +) -> tuple[str, ...]: + """Return the names of a function's mandatory arguments. + + Should return the names of all function arguments that: + * Aren't bound to an instance or type as in instance or class methods. + * Don't have default values. + * Aren't bound with functools.partial. + * Aren't replaced with mocks. + + The is_method and cls arguments indicate that the function should + be treated as a bound method even though it's not unless, only in + the case of cls, the function is a static method. + + The name parameter should be the original name in which the function was collected. + """ + # TODO(RonnyPfannschmidt): This function should be refactored when we + # revisit fixtures. The fixture mechanism should ask the node for + # the fixture names, and not try to obtain directly from the + # function object well after collection has occurred. + + # The parameters attribute of a Signature object contains an + # ordered mapping of parameter names to Parameter instances. This + # creates a tuple of the names of the parameters that don't have + # defaults. + try: + parameters = signature(function).parameters + except (ValueError, TypeError) as e: + from _pytest.outcomes import fail + + fail( + f"Could not determine arguments of {function!r}: {e}", + pytrace=False, + ) + + arg_names = tuple( + p.name + for p in parameters.values() + if ( + p.kind is Parameter.POSITIONAL_OR_KEYWORD + or p.kind is Parameter.KEYWORD_ONLY + ) + and p.default is Parameter.empty + ) + if not name: + name = function.__name__ + + # If this function should be treated as a bound method even though + # it's passed as an unbound method or function, remove the first + # parameter name. + if is_method or ( + # Not using `getattr` because we don't want to resolve the staticmethod. + # Not using `cls.__dict__` because we want to check the entire MRO. + cls + and not isinstance( + inspect.getattr_static(cls, name, default=None), staticmethod + ) + ): + arg_names = arg_names[1:] + # Remove any names that will be replaced with mocks. + if hasattr(function, "__wrapped__"): + arg_names = arg_names[num_mock_patch_args(function) :] + return arg_names + + +def get_default_arg_names(function: Callable[..., Any]) -> tuple[str, ...]: + # Note: this code intentionally mirrors the code at the beginning of + # getfuncargnames, to get the arguments which were excluded from its result + # because they had default values. + return tuple( + p.name + for p in signature(function).parameters.values() + if p.kind in (Parameter.POSITIONAL_OR_KEYWORD, Parameter.KEYWORD_ONLY) + and p.default is not Parameter.empty + ) + + +_non_printable_ascii_translate_table = { + i: f"\\x{i:02x}" for i in range(128) if i not in range(32, 127) +} +_non_printable_ascii_translate_table.update( + {ord("\t"): "\\t", ord("\r"): "\\r", ord("\n"): "\\n"} +) + + +def _translate_non_printable(s: str) -> str: + return s.translate(_non_printable_ascii_translate_table) + + +STRING_TYPES = bytes, str + + +def _bytes_to_ascii(val: bytes) -> str: + return val.decode("ascii", "backslashreplace") + + +def ascii_escaped(val: bytes | str) -> str: + r"""If val is pure ASCII, return it as an str, otherwise, escape + bytes objects into a sequence of escaped bytes: + + b'\xc3\xb4\xc5\xd6' -> r'\xc3\xb4\xc5\xd6' + + and escapes unicode objects into a sequence of escaped unicode + ids, e.g.: + + r'4\nV\U00043efa\x0eMXWB\x1e\u3028\u15fd\xcd\U0007d944' + + Note: + The obvious "v.decode('unicode-escape')" will return + valid UTF-8 unicode if it finds them in bytes, but we + want to return escaped bytes for any byte, even if they match + a UTF-8 string. + """ + if isinstance(val, bytes): + ret = _bytes_to_ascii(val) + else: + ret = val + return ret + + +@dataclasses.dataclass +class _PytestWrapper: + """Dummy wrapper around a function object for internal use only. + + Used to correctly unwrap the underlying function object when we are + creating fixtures, because we wrap the function object ourselves with a + decorator to issue warnings when the fixture function is called directly. + """ + + obj: Any + + +def get_real_func(obj): + """Get the real function object of the (possibly) wrapped object by + functools.wraps or functools.partial.""" + start_obj = obj + for i in range(100): + # __pytest_wrapped__ is set by @pytest.fixture when wrapping the fixture function + # to trigger a warning if it gets called directly instead of by pytest: we don't + # want to unwrap further than this otherwise we lose useful wrappings like @mock.patch (#3774) + new_obj = getattr(obj, "__pytest_wrapped__", None) + if isinstance(new_obj, _PytestWrapper): + obj = new_obj.obj + break + new_obj = getattr(obj, "__wrapped__", None) + if new_obj is None: + break + obj = new_obj + else: + from _pytest._io.saferepr import saferepr + + raise ValueError( + ("could not find real function of {start}\nstopped at {current}").format( + start=saferepr(start_obj), current=saferepr(obj) + ) + ) + if isinstance(obj, functools.partial): + obj = obj.func + return obj + + +def get_real_method(obj, holder): + """Attempt to obtain the real function object that might be wrapping + ``obj``, while at the same time returning a bound method to ``holder`` if + the original object was a bound method.""" + try: + is_method = hasattr(obj, "__func__") + obj = get_real_func(obj) + except Exception: # pragma: no cover + return obj + if is_method and hasattr(obj, "__get__") and callable(obj.__get__): + obj = obj.__get__(holder) + return obj + + +def getimfunc(func): + try: + return func.__func__ + except AttributeError: + return func + + +def safe_getattr(object: Any, name: str, default: Any) -> Any: + """Like getattr but return default upon any Exception or any OutcomeException. + + Attribute access can potentially fail for 'evil' Python objects. + See issue #214. + It catches OutcomeException because of #2490 (issue #580), new outcomes + are derived from BaseException instead of Exception (for more details + check #2707). + """ + from _pytest.outcomes import TEST_OUTCOME + + try: + return getattr(object, name, default) + except TEST_OUTCOME: + return default + + +def safe_isclass(obj: object) -> bool: + """Ignore any exception via isinstance on Python 3.""" + try: + return inspect.isclass(obj) + except Exception: + return False + + +if TYPE_CHECKING: + if sys.version_info >= (3, 8): + from typing import final as final + else: + from typing_extensions import final as final +elif sys.version_info >= (3, 8): + from typing import final as final +else: + + def final(f): + return f + + +if sys.version_info >= (3, 8): + from functools import cached_property as cached_property +else: + + class cached_property(Generic[_S, _T]): + __slots__ = ("func", "__doc__") + + def __init__(self, func: Callable[[_S], _T]) -> None: + self.func = func + self.__doc__ = func.__doc__ + + @overload + def __get__( + self, instance: None, owner: type[_S] | None = ... + ) -> cached_property[_S, _T]: + ... + + @overload + def __get__(self, instance: _S, owner: type[_S] | None = ...) -> _T: + ... + + def __get__(self, instance, owner=None): + if instance is None: + return self + value = instance.__dict__[self.func.__name__] = self.func(instance) + return value + + +def get_user_id() -> int | None: + """Return the current user id, or None if we cannot get it reliably on the current platform.""" + # win32 does not have a getuid() function. + # On Emscripten, getuid() is a stub that always returns 0. + if sys.platform in ("win32", "emscripten"): + return None + # getuid shouldn't fail, but cpython defines such a case. + # Let's hope for the best. + uid = os.getuid() + return uid if uid != -1 else None + + +# Perform exhaustiveness checking. +# +# Consider this example: +# +# MyUnion = Union[int, str] +# +# def handle(x: MyUnion) -> int { +# if isinstance(x, int): +# return 1 +# elif isinstance(x, str): +# return 2 +# else: +# raise Exception('unreachable') +# +# Now suppose we add a new variant: +# +# MyUnion = Union[int, str, bytes] +# +# After doing this, we must remember ourselves to go and update the handle +# function to handle the new variant. +# +# With `assert_never` we can do better: +# +# // raise Exception('unreachable') +# return assert_never(x) +# +# Now, if we forget to handle the new variant, the type-checker will emit a +# compile-time error, instead of the runtime error we would have gotten +# previously. +# +# This also work for Enums (if you use `is` to compare) and Literals. +def assert_never(value: NoReturn) -> NoReturn: + assert False, f"Unhandled value: {value} ({type(value).__name__})" |