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2211 lines
63 KiB
2211 lines
63 KiB
# util/langhelpers.py
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# Copyright (C) 2005-2024 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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# mypy: allow-untyped-defs, allow-untyped-calls
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"""Routines to help with the creation, loading and introspection of
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modules, classes, hierarchies, attributes, functions, and methods.
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"""
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from __future__ import annotations
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import collections
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import enum
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from functools import update_wrapper
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import inspect
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import itertools
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import operator
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import re
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import sys
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import textwrap
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import threading
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import types
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from types import CodeType
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from typing import Any
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from typing import Callable
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from typing import cast
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from typing import Dict
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from typing import FrozenSet
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from typing import Generic
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from typing import Iterator
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from typing import List
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from typing import Mapping
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from typing import NoReturn
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from typing import Optional
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from typing import overload
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from typing import Sequence
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from typing import Set
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from typing import Tuple
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from typing import Type
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from typing import TYPE_CHECKING
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from typing import TypeVar
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from typing import Union
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import warnings
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from . import _collections
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from . import compat
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from ._has_cy import HAS_CYEXTENSION
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from .typing import Literal
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from .. import exc
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_T = TypeVar("_T")
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_T_co = TypeVar("_T_co", covariant=True)
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_F = TypeVar("_F", bound=Callable[..., Any])
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_MP = TypeVar("_MP", bound="memoized_property[Any]")
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_MA = TypeVar("_MA", bound="HasMemoized.memoized_attribute[Any]")
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_HP = TypeVar("_HP", bound="hybridproperty[Any]")
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_HM = TypeVar("_HM", bound="hybridmethod[Any]")
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if compat.py310:
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def get_annotations(obj: Any) -> Mapping[str, Any]:
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return inspect.get_annotations(obj)
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else:
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def get_annotations(obj: Any) -> Mapping[str, Any]:
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# it's been observed that cls.__annotations__ can be non present.
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# it's not clear what causes this, running under tox py37/38 it
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# happens, running straight pytest it doesnt
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# https://docs.python.org/3/howto/annotations.html#annotations-howto
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if isinstance(obj, type):
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ann = obj.__dict__.get("__annotations__", None)
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else:
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ann = getattr(obj, "__annotations__", None)
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if ann is None:
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return _collections.EMPTY_DICT
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else:
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return cast("Mapping[str, Any]", ann)
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def md5_hex(x: Any) -> str:
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x = x.encode("utf-8")
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m = compat.md5_not_for_security()
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m.update(x)
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return cast(str, m.hexdigest())
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class safe_reraise:
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"""Reraise an exception after invoking some
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handler code.
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Stores the existing exception info before
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invoking so that it is maintained across a potential
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coroutine context switch.
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e.g.::
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try:
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sess.commit()
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except:
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with safe_reraise():
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sess.rollback()
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TODO: we should at some point evaluate current behaviors in this regard
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based on current greenlet, gevent/eventlet implementations in Python 3, and
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also see the degree to which our own asyncio (based on greenlet also) is
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impacted by this. .rollback() will cause IO / context switch to occur in
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all these scenarios; what happens to the exception context from an
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"except:" block if we don't explicitly store it? Original issue was #2703.
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"""
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__slots__ = ("_exc_info",)
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_exc_info: Union[
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None,
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Tuple[
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Type[BaseException],
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BaseException,
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types.TracebackType,
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],
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Tuple[None, None, None],
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]
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def __enter__(self) -> None:
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self._exc_info = sys.exc_info()
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def __exit__(
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self,
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type_: Optional[Type[BaseException]],
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value: Optional[BaseException],
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traceback: Optional[types.TracebackType],
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) -> NoReturn:
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assert self._exc_info is not None
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# see #2703 for notes
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if type_ is None:
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exc_type, exc_value, exc_tb = self._exc_info
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assert exc_value is not None
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self._exc_info = None # remove potential circular references
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raise exc_value.with_traceback(exc_tb)
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else:
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self._exc_info = None # remove potential circular references
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assert value is not None
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raise value.with_traceback(traceback)
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def walk_subclasses(cls: Type[_T]) -> Iterator[Type[_T]]:
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seen: Set[Any] = set()
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stack = [cls]
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while stack:
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cls = stack.pop()
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if cls in seen:
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continue
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else:
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seen.add(cls)
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stack.extend(cls.__subclasses__())
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yield cls
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def string_or_unprintable(element: Any) -> str:
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if isinstance(element, str):
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return element
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else:
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try:
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return str(element)
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except Exception:
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return "unprintable element %r" % element
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def clsname_as_plain_name(cls: Type[Any]) -> str:
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return " ".join(
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n.lower() for n in re.findall(r"([A-Z][a-z]+|SQL)", cls.__name__)
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)
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def method_is_overridden(
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instance_or_cls: Union[Type[Any], object],
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against_method: Callable[..., Any],
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) -> bool:
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"""Return True if the two class methods don't match."""
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if not isinstance(instance_or_cls, type):
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current_cls = instance_or_cls.__class__
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else:
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current_cls = instance_or_cls
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method_name = against_method.__name__
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current_method: types.MethodType = getattr(current_cls, method_name)
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return current_method != against_method
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def decode_slice(slc: slice) -> Tuple[Any, ...]:
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"""decode a slice object as sent to __getitem__.
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takes into account the 2.5 __index__() method, basically.
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"""
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ret: List[Any] = []
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for x in slc.start, slc.stop, slc.step:
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if hasattr(x, "__index__"):
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x = x.__index__()
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ret.append(x)
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return tuple(ret)
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def _unique_symbols(used: Sequence[str], *bases: str) -> Iterator[str]:
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used_set = set(used)
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for base in bases:
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pool = itertools.chain(
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(base,),
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map(lambda i: base + str(i), range(1000)),
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)
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for sym in pool:
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if sym not in used_set:
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used_set.add(sym)
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yield sym
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break
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else:
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raise NameError("exhausted namespace for symbol base %s" % base)
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def map_bits(fn: Callable[[int], Any], n: int) -> Iterator[Any]:
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"""Call the given function given each nonzero bit from n."""
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while n:
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b = n & (~n + 1)
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yield fn(b)
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n ^= b
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_Fn = TypeVar("_Fn", bound="Callable[..., Any]")
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# this seems to be in flux in recent mypy versions
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def decorator(target: Callable[..., Any]) -> Callable[[_Fn], _Fn]:
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"""A signature-matching decorator factory."""
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def decorate(fn: _Fn) -> _Fn:
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if not inspect.isfunction(fn) and not inspect.ismethod(fn):
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raise Exception("not a decoratable function")
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spec = compat.inspect_getfullargspec(fn)
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env: Dict[str, Any] = {}
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spec = _update_argspec_defaults_into_env(spec, env)
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names = (
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tuple(cast("Tuple[str, ...]", spec[0]))
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+ cast("Tuple[str, ...]", spec[1:3])
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+ (fn.__name__,)
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)
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targ_name, fn_name = _unique_symbols(names, "target", "fn")
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metadata: Dict[str, Optional[str]] = dict(target=targ_name, fn=fn_name)
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metadata.update(format_argspec_plus(spec, grouped=False))
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metadata["name"] = fn.__name__
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if inspect.iscoroutinefunction(fn):
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metadata["prefix"] = "async "
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metadata["target_prefix"] = "await "
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else:
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metadata["prefix"] = ""
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metadata["target_prefix"] = ""
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# look for __ positional arguments. This is a convention in
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# SQLAlchemy that arguments should be passed positionally
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# rather than as keyword
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# arguments. note that apply_pos doesn't currently work in all cases
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# such as when a kw-only indicator "*" is present, which is why
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# we limit the use of this to just that case we can detect. As we add
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# more kinds of methods that use @decorator, things may have to
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# be further improved in this area
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if "__" in repr(spec[0]):
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code = (
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"""\
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%(prefix)sdef %(name)s%(grouped_args)s:
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return %(target_prefix)s%(target)s(%(fn)s, %(apply_pos)s)
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"""
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% metadata
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)
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else:
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code = (
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"""\
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%(prefix)sdef %(name)s%(grouped_args)s:
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return %(target_prefix)s%(target)s(%(fn)s, %(apply_kw)s)
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"""
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% metadata
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)
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mod = sys.modules[fn.__module__]
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env.update(vars(mod))
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env.update({targ_name: target, fn_name: fn, "__name__": fn.__module__})
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decorated = cast(
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types.FunctionType,
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_exec_code_in_env(code, env, fn.__name__),
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)
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decorated.__defaults__ = getattr(fn, "__func__", fn).__defaults__
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decorated.__wrapped__ = fn # type: ignore
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return cast(_Fn, update_wrapper(decorated, fn))
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return update_wrapper(decorate, target)
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def _update_argspec_defaults_into_env(spec, env):
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"""given a FullArgSpec, convert defaults to be symbol names in an env."""
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if spec.defaults:
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new_defaults = []
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i = 0
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for arg in spec.defaults:
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if type(arg).__module__ not in ("builtins", "__builtin__"):
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name = "x%d" % i
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env[name] = arg
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new_defaults.append(name)
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i += 1
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else:
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new_defaults.append(arg)
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elem = list(spec)
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elem[3] = tuple(new_defaults)
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return compat.FullArgSpec(*elem)
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else:
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return spec
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def _exec_code_in_env(
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code: Union[str, types.CodeType], env: Dict[str, Any], fn_name: str
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) -> Callable[..., Any]:
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exec(code, env)
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return env[fn_name] # type: ignore[no-any-return]
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_PF = TypeVar("_PF")
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_TE = TypeVar("_TE")
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class PluginLoader:
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def __init__(
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self, group: str, auto_fn: Optional[Callable[..., Any]] = None
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):
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self.group = group
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self.impls: Dict[str, Any] = {}
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self.auto_fn = auto_fn
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def clear(self):
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self.impls.clear()
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def load(self, name: str) -> Any:
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if name in self.impls:
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return self.impls[name]()
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if self.auto_fn:
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loader = self.auto_fn(name)
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if loader:
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self.impls[name] = loader
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return loader()
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for impl in compat.importlib_metadata_get(self.group):
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if impl.name == name:
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self.impls[name] = impl.load
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return impl.load()
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raise exc.NoSuchModuleError(
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"Can't load plugin: %s:%s" % (self.group, name)
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)
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def register(self, name: str, modulepath: str, objname: str) -> None:
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def load():
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mod = __import__(modulepath)
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for token in modulepath.split(".")[1:]:
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mod = getattr(mod, token)
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return getattr(mod, objname)
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self.impls[name] = load
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def _inspect_func_args(fn):
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try:
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co_varkeywords = inspect.CO_VARKEYWORDS
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except AttributeError:
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# https://docs.python.org/3/library/inspect.html
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# The flags are specific to CPython, and may not be defined in other
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# Python implementations. Furthermore, the flags are an implementation
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# detail, and can be removed or deprecated in future Python releases.
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spec = compat.inspect_getfullargspec(fn)
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return spec[0], bool(spec[2])
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else:
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# use fn.__code__ plus flags to reduce method call overhead
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co = fn.__code__
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nargs = co.co_argcount
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return (
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list(co.co_varnames[:nargs]),
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bool(co.co_flags & co_varkeywords),
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)
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@overload
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def get_cls_kwargs(
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cls: type,
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*,
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_set: Optional[Set[str]] = None,
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raiseerr: Literal[True] = ...,
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) -> Set[str]: ...
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|
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@overload
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def get_cls_kwargs(
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cls: type, *, _set: Optional[Set[str]] = None, raiseerr: bool = False
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) -> Optional[Set[str]]: ...
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|
|
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def get_cls_kwargs(
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cls: type, *, _set: Optional[Set[str]] = None, raiseerr: bool = False
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) -> Optional[Set[str]]:
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r"""Return the full set of inherited kwargs for the given `cls`.
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Probes a class's __init__ method, collecting all named arguments. If the
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__init__ defines a \**kwargs catch-all, then the constructor is presumed
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to pass along unrecognized keywords to its base classes, and the
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collection process is repeated recursively on each of the bases.
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Uses a subset of inspect.getfullargspec() to cut down on method overhead,
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as this is used within the Core typing system to create copies of type
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objects which is a performance-sensitive operation.
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No anonymous tuple arguments please !
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"""
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toplevel = _set is None
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if toplevel:
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_set = set()
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assert _set is not None
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ctr = cls.__dict__.get("__init__", False)
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has_init = (
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ctr
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and isinstance(ctr, types.FunctionType)
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and isinstance(ctr.__code__, types.CodeType)
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)
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if has_init:
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names, has_kw = _inspect_func_args(ctr)
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_set.update(names)
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if not has_kw and not toplevel:
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if raiseerr:
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raise TypeError(
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f"given cls {cls} doesn't have an __init__ method"
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)
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else:
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return None
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else:
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has_kw = False
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|
|
|
if not has_init or has_kw:
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for c in cls.__bases__:
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if get_cls_kwargs(c, _set=_set) is None:
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break
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_set.discard("self")
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return _set
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|
|
|
|
|
def get_func_kwargs(func: Callable[..., Any]) -> List[str]:
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|
"""Return the set of legal kwargs for the given `func`.
|
|
|
|
Uses getargspec so is safe to call for methods, functions,
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etc.
|
|
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|
"""
|
|
|
|
return compat.inspect_getfullargspec(func)[0]
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|
|
|
|
|
def get_callable_argspec(
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fn: Callable[..., Any], no_self: bool = False, _is_init: bool = False
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|
) -> compat.FullArgSpec:
|
|
"""Return the argument signature for any callable.
|
|
|
|
All pure-Python callables are accepted, including
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functions, methods, classes, objects with __call__;
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|
builtins and other edge cases like functools.partial() objects
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raise a TypeError.
|
|
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|
"""
|
|
if inspect.isbuiltin(fn):
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raise TypeError("Can't inspect builtin: %s" % fn)
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|
elif inspect.isfunction(fn):
|
|
if _is_init and no_self:
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spec = compat.inspect_getfullargspec(fn)
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|
return compat.FullArgSpec(
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|
spec.args[1:],
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|
spec.varargs,
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|
spec.varkw,
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|
spec.defaults,
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|
spec.kwonlyargs,
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|
spec.kwonlydefaults,
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|
spec.annotations,
|
|
)
|
|
else:
|
|
return compat.inspect_getfullargspec(fn)
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|
elif inspect.ismethod(fn):
|
|
if no_self and (_is_init or fn.__self__):
|
|
spec = compat.inspect_getfullargspec(fn.__func__)
|
|
return compat.FullArgSpec(
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spec.args[1:],
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spec.varargs,
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|
spec.varkw,
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|
spec.defaults,
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|
spec.kwonlyargs,
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|
spec.kwonlydefaults,
|
|
spec.annotations,
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|
)
|
|
else:
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|
return compat.inspect_getfullargspec(fn.__func__)
|
|
elif inspect.isclass(fn):
|
|
return get_callable_argspec(
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|
fn.__init__, no_self=no_self, _is_init=True
|
|
)
|
|
elif hasattr(fn, "__func__"):
|
|
return compat.inspect_getfullargspec(fn.__func__)
|
|
elif hasattr(fn, "__call__"):
|
|
if inspect.ismethod(fn.__call__):
|
|
return get_callable_argspec(fn.__call__, no_self=no_self)
|
|
else:
|
|
raise TypeError("Can't inspect callable: %s" % fn)
|
|
else:
|
|
raise TypeError("Can't inspect callable: %s" % fn)
|
|
|
|
|
|
def format_argspec_plus(
|
|
fn: Union[Callable[..., Any], compat.FullArgSpec], grouped: bool = True
|
|
) -> Dict[str, Optional[str]]:
|
|
"""Returns a dictionary of formatted, introspected function arguments.
|
|
|
|
A enhanced variant of inspect.formatargspec to support code generation.
|
|
|
|
fn
|
|
An inspectable callable or tuple of inspect getargspec() results.
|
|
grouped
|
|
Defaults to True; include (parens, around, argument) lists
|
|
|
|
Returns:
|
|
|
|
args
|
|
Full inspect.formatargspec for fn
|
|
self_arg
|
|
The name of the first positional argument, varargs[0], or None
|
|
if the function defines no positional arguments.
|
|
apply_pos
|
|
args, re-written in calling rather than receiving syntax. Arguments are
|
|
passed positionally.
|
|
apply_kw
|
|
Like apply_pos, except keyword-ish args are passed as keywords.
|
|
apply_pos_proxied
|
|
Like apply_pos but omits the self/cls argument
|
|
|
|
Example::
|
|
|
|
>>> format_argspec_plus(lambda self, a, b, c=3, **d: 123)
|
|
{'grouped_args': '(self, a, b, c=3, **d)',
|
|
'self_arg': 'self',
|
|
'apply_kw': '(self, a, b, c=c, **d)',
|
|
'apply_pos': '(self, a, b, c, **d)'}
|
|
|
|
"""
|
|
if callable(fn):
|
|
spec = compat.inspect_getfullargspec(fn)
|
|
else:
|
|
spec = fn
|
|
|
|
args = compat.inspect_formatargspec(*spec)
|
|
|
|
apply_pos = compat.inspect_formatargspec(
|
|
spec[0], spec[1], spec[2], None, spec[4]
|
|
)
|
|
|
|
if spec[0]:
|
|
self_arg = spec[0][0]
|
|
|
|
apply_pos_proxied = compat.inspect_formatargspec(
|
|
spec[0][1:], spec[1], spec[2], None, spec[4]
|
|
)
|
|
|
|
elif spec[1]:
|
|
# I'm not sure what this is
|
|
self_arg = "%s[0]" % spec[1]
|
|
|
|
apply_pos_proxied = apply_pos
|
|
else:
|
|
self_arg = None
|
|
apply_pos_proxied = apply_pos
|
|
|
|
num_defaults = 0
|
|
if spec[3]:
|
|
num_defaults += len(cast(Tuple[Any], spec[3]))
|
|
if spec[4]:
|
|
num_defaults += len(spec[4])
|
|
|
|
name_args = spec[0] + spec[4]
|
|
|
|
defaulted_vals: Union[List[str], Tuple[()]]
|
|
|
|
if num_defaults:
|
|
defaulted_vals = name_args[0 - num_defaults :]
|
|
else:
|
|
defaulted_vals = ()
|
|
|
|
apply_kw = compat.inspect_formatargspec(
|
|
name_args,
|
|
spec[1],
|
|
spec[2],
|
|
defaulted_vals,
|
|
formatvalue=lambda x: "=" + str(x),
|
|
)
|
|
|
|
if spec[0]:
|
|
apply_kw_proxied = compat.inspect_formatargspec(
|
|
name_args[1:],
|
|
spec[1],
|
|
spec[2],
|
|
defaulted_vals,
|
|
formatvalue=lambda x: "=" + str(x),
|
|
)
|
|
else:
|
|
apply_kw_proxied = apply_kw
|
|
|
|
if grouped:
|
|
return dict(
|
|
grouped_args=args,
|
|
self_arg=self_arg,
|
|
apply_pos=apply_pos,
|
|
apply_kw=apply_kw,
|
|
apply_pos_proxied=apply_pos_proxied,
|
|
apply_kw_proxied=apply_kw_proxied,
|
|
)
|
|
else:
|
|
return dict(
|
|
grouped_args=args,
|
|
self_arg=self_arg,
|
|
apply_pos=apply_pos[1:-1],
|
|
apply_kw=apply_kw[1:-1],
|
|
apply_pos_proxied=apply_pos_proxied[1:-1],
|
|
apply_kw_proxied=apply_kw_proxied[1:-1],
|
|
)
|
|
|
|
|
|
def format_argspec_init(method, grouped=True):
|
|
"""format_argspec_plus with considerations for typical __init__ methods
|
|
|
|
Wraps format_argspec_plus with error handling strategies for typical
|
|
__init__ cases::
|
|
|
|
object.__init__ -> (self)
|
|
other unreflectable (usually C) -> (self, *args, **kwargs)
|
|
|
|
"""
|
|
if method is object.__init__:
|
|
grouped_args = "(self)"
|
|
args = "(self)" if grouped else "self"
|
|
proxied = "()" if grouped else ""
|
|
else:
|
|
try:
|
|
return format_argspec_plus(method, grouped=grouped)
|
|
except TypeError:
|
|
grouped_args = "(self, *args, **kwargs)"
|
|
args = grouped_args if grouped else "self, *args, **kwargs"
|
|
proxied = "(*args, **kwargs)" if grouped else "*args, **kwargs"
|
|
return dict(
|
|
self_arg="self",
|
|
grouped_args=grouped_args,
|
|
apply_pos=args,
|
|
apply_kw=args,
|
|
apply_pos_proxied=proxied,
|
|
apply_kw_proxied=proxied,
|
|
)
|
|
|
|
|
|
def create_proxy_methods(
|
|
target_cls: Type[Any],
|
|
target_cls_sphinx_name: str,
|
|
proxy_cls_sphinx_name: str,
|
|
classmethods: Sequence[str] = (),
|
|
methods: Sequence[str] = (),
|
|
attributes: Sequence[str] = (),
|
|
use_intermediate_variable: Sequence[str] = (),
|
|
) -> Callable[[_T], _T]:
|
|
"""A class decorator indicating attributes should refer to a proxy
|
|
class.
|
|
|
|
This decorator is now a "marker" that does nothing at runtime. Instead,
|
|
it is consumed by the tools/generate_proxy_methods.py script to
|
|
statically generate proxy methods and attributes that are fully
|
|
recognized by typing tools such as mypy.
|
|
|
|
"""
|
|
|
|
def decorate(cls):
|
|
return cls
|
|
|
|
return decorate
|
|
|
|
|
|
def getargspec_init(method):
|
|
"""inspect.getargspec with considerations for typical __init__ methods
|
|
|
|
Wraps inspect.getargspec with error handling for typical __init__ cases::
|
|
|
|
object.__init__ -> (self)
|
|
other unreflectable (usually C) -> (self, *args, **kwargs)
|
|
|
|
"""
|
|
try:
|
|
return compat.inspect_getfullargspec(method)
|
|
except TypeError:
|
|
if method is object.__init__:
|
|
return (["self"], None, None, None)
|
|
else:
|
|
return (["self"], "args", "kwargs", None)
|
|
|
|
|
|
def unbound_method_to_callable(func_or_cls):
|
|
"""Adjust the incoming callable such that a 'self' argument is not
|
|
required.
|
|
|
|
"""
|
|
|
|
if isinstance(func_or_cls, types.MethodType) and not func_or_cls.__self__:
|
|
return func_or_cls.__func__
|
|
else:
|
|
return func_or_cls
|
|
|
|
|
|
def generic_repr(
|
|
obj: Any,
|
|
additional_kw: Sequence[Tuple[str, Any]] = (),
|
|
to_inspect: Optional[Union[object, List[object]]] = None,
|
|
omit_kwarg: Sequence[str] = (),
|
|
) -> str:
|
|
"""Produce a __repr__() based on direct association of the __init__()
|
|
specification vs. same-named attributes present.
|
|
|
|
"""
|
|
if to_inspect is None:
|
|
to_inspect = [obj]
|
|
else:
|
|
to_inspect = _collections.to_list(to_inspect)
|
|
|
|
missing = object()
|
|
|
|
pos_args = []
|
|
kw_args: _collections.OrderedDict[str, Any] = _collections.OrderedDict()
|
|
vargs = None
|
|
for i, insp in enumerate(to_inspect):
|
|
try:
|
|
spec = compat.inspect_getfullargspec(insp.__init__)
|
|
except TypeError:
|
|
continue
|
|
else:
|
|
default_len = len(spec.defaults) if spec.defaults else 0
|
|
if i == 0:
|
|
if spec.varargs:
|
|
vargs = spec.varargs
|
|
if default_len:
|
|
pos_args.extend(spec.args[1:-default_len])
|
|
else:
|
|
pos_args.extend(spec.args[1:])
|
|
else:
|
|
kw_args.update(
|
|
[(arg, missing) for arg in spec.args[1:-default_len]]
|
|
)
|
|
|
|
if default_len:
|
|
assert spec.defaults
|
|
kw_args.update(
|
|
[
|
|
(arg, default)
|
|
for arg, default in zip(
|
|
spec.args[-default_len:], spec.defaults
|
|
)
|
|
]
|
|
)
|
|
output: List[str] = []
|
|
|
|
output.extend(repr(getattr(obj, arg, None)) for arg in pos_args)
|
|
|
|
if vargs is not None and hasattr(obj, vargs):
|
|
output.extend([repr(val) for val in getattr(obj, vargs)])
|
|
|
|
for arg, defval in kw_args.items():
|
|
if arg in omit_kwarg:
|
|
continue
|
|
try:
|
|
val = getattr(obj, arg, missing)
|
|
if val is not missing and val != defval:
|
|
output.append("%s=%r" % (arg, val))
|
|
except Exception:
|
|
pass
|
|
|
|
if additional_kw:
|
|
for arg, defval in additional_kw:
|
|
try:
|
|
val = getattr(obj, arg, missing)
|
|
if val is not missing and val != defval:
|
|
output.append("%s=%r" % (arg, val))
|
|
except Exception:
|
|
pass
|
|
|
|
return "%s(%s)" % (obj.__class__.__name__, ", ".join(output))
|
|
|
|
|
|
class portable_instancemethod:
|
|
"""Turn an instancemethod into a (parent, name) pair
|
|
to produce a serializable callable.
|
|
|
|
"""
|
|
|
|
__slots__ = "target", "name", "kwargs", "__weakref__"
|
|
|
|
def __getstate__(self):
|
|
return {
|
|
"target": self.target,
|
|
"name": self.name,
|
|
"kwargs": self.kwargs,
|
|
}
|
|
|
|
def __setstate__(self, state):
|
|
self.target = state["target"]
|
|
self.name = state["name"]
|
|
self.kwargs = state.get("kwargs", ())
|
|
|
|
def __init__(self, meth, kwargs=()):
|
|
self.target = meth.__self__
|
|
self.name = meth.__name__
|
|
self.kwargs = kwargs
|
|
|
|
def __call__(self, *arg, **kw):
|
|
kw.update(self.kwargs)
|
|
return getattr(self.target, self.name)(*arg, **kw)
|
|
|
|
|
|
def class_hierarchy(cls):
|
|
"""Return an unordered sequence of all classes related to cls.
|
|
|
|
Traverses diamond hierarchies.
|
|
|
|
Fibs slightly: subclasses of builtin types are not returned. Thus
|
|
class_hierarchy(class A(object)) returns (A, object), not A plus every
|
|
class systemwide that derives from object.
|
|
|
|
"""
|
|
|
|
hier = {cls}
|
|
process = list(cls.__mro__)
|
|
while process:
|
|
c = process.pop()
|
|
bases = (_ for _ in c.__bases__ if _ not in hier)
|
|
|
|
for b in bases:
|
|
process.append(b)
|
|
hier.add(b)
|
|
|
|
if c.__module__ == "builtins" or not hasattr(c, "__subclasses__"):
|
|
continue
|
|
|
|
for s in [
|
|
_
|
|
for _ in (
|
|
c.__subclasses__()
|
|
if not issubclass(c, type)
|
|
else c.__subclasses__(c)
|
|
)
|
|
if _ not in hier
|
|
]:
|
|
process.append(s)
|
|
hier.add(s)
|
|
return list(hier)
|
|
|
|
|
|
def iterate_attributes(cls):
|
|
"""iterate all the keys and attributes associated
|
|
with a class, without using getattr().
|
|
|
|
Does not use getattr() so that class-sensitive
|
|
descriptors (i.e. property.__get__()) are not called.
|
|
|
|
"""
|
|
keys = dir(cls)
|
|
for key in keys:
|
|
for c in cls.__mro__:
|
|
if key in c.__dict__:
|
|
yield (key, c.__dict__[key])
|
|
break
|
|
|
|
|
|
def monkeypatch_proxied_specials(
|
|
into_cls,
|
|
from_cls,
|
|
skip=None,
|
|
only=None,
|
|
name="self.proxy",
|
|
from_instance=None,
|
|
):
|
|
"""Automates delegation of __specials__ for a proxying type."""
|
|
|
|
if only:
|
|
dunders = only
|
|
else:
|
|
if skip is None:
|
|
skip = (
|
|
"__slots__",
|
|
"__del__",
|
|
"__getattribute__",
|
|
"__metaclass__",
|
|
"__getstate__",
|
|
"__setstate__",
|
|
)
|
|
dunders = [
|
|
m
|
|
for m in dir(from_cls)
|
|
if (
|
|
m.startswith("__")
|
|
and m.endswith("__")
|
|
and not hasattr(into_cls, m)
|
|
and m not in skip
|
|
)
|
|
]
|
|
|
|
for method in dunders:
|
|
try:
|
|
maybe_fn = getattr(from_cls, method)
|
|
if not hasattr(maybe_fn, "__call__"):
|
|
continue
|
|
maybe_fn = getattr(maybe_fn, "__func__", maybe_fn)
|
|
fn = cast(types.FunctionType, maybe_fn)
|
|
|
|
except AttributeError:
|
|
continue
|
|
try:
|
|
spec = compat.inspect_getfullargspec(fn)
|
|
fn_args = compat.inspect_formatargspec(spec[0])
|
|
d_args = compat.inspect_formatargspec(spec[0][1:])
|
|
except TypeError:
|
|
fn_args = "(self, *args, **kw)"
|
|
d_args = "(*args, **kw)"
|
|
|
|
py = (
|
|
"def %(method)s%(fn_args)s: "
|
|
"return %(name)s.%(method)s%(d_args)s" % locals()
|
|
)
|
|
|
|
env: Dict[str, types.FunctionType] = (
|
|
from_instance is not None and {name: from_instance} or {}
|
|
)
|
|
exec(py, env)
|
|
try:
|
|
env[method].__defaults__ = fn.__defaults__
|
|
except AttributeError:
|
|
pass
|
|
setattr(into_cls, method, env[method])
|
|
|
|
|
|
def methods_equivalent(meth1, meth2):
|
|
"""Return True if the two methods are the same implementation."""
|
|
|
|
return getattr(meth1, "__func__", meth1) is getattr(
|
|
meth2, "__func__", meth2
|
|
)
|
|
|
|
|
|
def as_interface(obj, cls=None, methods=None, required=None):
|
|
"""Ensure basic interface compliance for an instance or dict of callables.
|
|
|
|
Checks that ``obj`` implements public methods of ``cls`` or has members
|
|
listed in ``methods``. If ``required`` is not supplied, implementing at
|
|
least one interface method is sufficient. Methods present on ``obj`` that
|
|
are not in the interface are ignored.
|
|
|
|
If ``obj`` is a dict and ``dict`` does not meet the interface
|
|
requirements, the keys of the dictionary are inspected. Keys present in
|
|
``obj`` that are not in the interface will raise TypeErrors.
|
|
|
|
Raises TypeError if ``obj`` does not meet the interface criteria.
|
|
|
|
In all passing cases, an object with callable members is returned. In the
|
|
simple case, ``obj`` is returned as-is; if dict processing kicks in then
|
|
an anonymous class is returned.
|
|
|
|
obj
|
|
A type, instance, or dictionary of callables.
|
|
cls
|
|
Optional, a type. All public methods of cls are considered the
|
|
interface. An ``obj`` instance of cls will always pass, ignoring
|
|
``required``..
|
|
methods
|
|
Optional, a sequence of method names to consider as the interface.
|
|
required
|
|
Optional, a sequence of mandatory implementations. If omitted, an
|
|
``obj`` that provides at least one interface method is considered
|
|
sufficient. As a convenience, required may be a type, in which case
|
|
all public methods of the type are required.
|
|
|
|
"""
|
|
if not cls and not methods:
|
|
raise TypeError("a class or collection of method names are required")
|
|
|
|
if isinstance(cls, type) and isinstance(obj, cls):
|
|
return obj
|
|
|
|
interface = set(methods or [m for m in dir(cls) if not m.startswith("_")])
|
|
implemented = set(dir(obj))
|
|
|
|
complies = operator.ge
|
|
if isinstance(required, type):
|
|
required = interface
|
|
elif not required:
|
|
required = set()
|
|
complies = operator.gt
|
|
else:
|
|
required = set(required)
|
|
|
|
if complies(implemented.intersection(interface), required):
|
|
return obj
|
|
|
|
# No dict duck typing here.
|
|
if not isinstance(obj, dict):
|
|
qualifier = complies is operator.gt and "any of" or "all of"
|
|
raise TypeError(
|
|
"%r does not implement %s: %s"
|
|
% (obj, qualifier, ", ".join(interface))
|
|
)
|
|
|
|
class AnonymousInterface:
|
|
"""A callable-holding shell."""
|
|
|
|
if cls:
|
|
AnonymousInterface.__name__ = "Anonymous" + cls.__name__
|
|
found = set()
|
|
|
|
for method, impl in dictlike_iteritems(obj):
|
|
if method not in interface:
|
|
raise TypeError("%r: unknown in this interface" % method)
|
|
if not callable(impl):
|
|
raise TypeError("%r=%r is not callable" % (method, impl))
|
|
setattr(AnonymousInterface, method, staticmethod(impl))
|
|
found.add(method)
|
|
|
|
if complies(found, required):
|
|
return AnonymousInterface
|
|
|
|
raise TypeError(
|
|
"dictionary does not contain required keys %s"
|
|
% ", ".join(required - found)
|
|
)
|
|
|
|
|
|
_GFD = TypeVar("_GFD", bound="generic_fn_descriptor[Any]")
|
|
|
|
|
|
class generic_fn_descriptor(Generic[_T_co]):
|
|
"""Descriptor which proxies a function when the attribute is not
|
|
present in dict
|
|
|
|
This superclass is organized in a particular way with "memoized" and
|
|
"non-memoized" implementation classes that are hidden from type checkers,
|
|
as Mypy seems to not be able to handle seeing multiple kinds of descriptor
|
|
classes used for the same attribute.
|
|
|
|
"""
|
|
|
|
fget: Callable[..., _T_co]
|
|
__doc__: Optional[str]
|
|
__name__: str
|
|
|
|
def __init__(self, fget: Callable[..., _T_co], doc: Optional[str] = None):
|
|
self.fget = fget
|
|
self.__doc__ = doc or fget.__doc__
|
|
self.__name__ = fget.__name__
|
|
|
|
@overload
|
|
def __get__(self: _GFD, obj: None, cls: Any) -> _GFD: ...
|
|
|
|
@overload
|
|
def __get__(self, obj: object, cls: Any) -> _T_co: ...
|
|
|
|
def __get__(self: _GFD, obj: Any, cls: Any) -> Union[_GFD, _T_co]:
|
|
raise NotImplementedError()
|
|
|
|
if TYPE_CHECKING:
|
|
|
|
def __set__(self, instance: Any, value: Any) -> None: ...
|
|
|
|
def __delete__(self, instance: Any) -> None: ...
|
|
|
|
def _reset(self, obj: Any) -> None:
|
|
raise NotImplementedError()
|
|
|
|
@classmethod
|
|
def reset(cls, obj: Any, name: str) -> None:
|
|
raise NotImplementedError()
|
|
|
|
|
|
class _non_memoized_property(generic_fn_descriptor[_T_co]):
|
|
"""a plain descriptor that proxies a function.
|
|
|
|
primary rationale is to provide a plain attribute that's
|
|
compatible with memoized_property which is also recognized as equivalent
|
|
by mypy.
|
|
|
|
"""
|
|
|
|
if not TYPE_CHECKING:
|
|
|
|
def __get__(self, obj, cls):
|
|
if obj is None:
|
|
return self
|
|
return self.fget(obj)
|
|
|
|
|
|
class _memoized_property(generic_fn_descriptor[_T_co]):
|
|
"""A read-only @property that is only evaluated once."""
|
|
|
|
if not TYPE_CHECKING:
|
|
|
|
def __get__(self, obj, cls):
|
|
if obj is None:
|
|
return self
|
|
obj.__dict__[self.__name__] = result = self.fget(obj)
|
|
return result
|
|
|
|
def _reset(self, obj):
|
|
_memoized_property.reset(obj, self.__name__)
|
|
|
|
@classmethod
|
|
def reset(cls, obj, name):
|
|
obj.__dict__.pop(name, None)
|
|
|
|
|
|
# despite many attempts to get Mypy to recognize an overridden descriptor
|
|
# where one is memoized and the other isn't, there seems to be no reliable
|
|
# way other than completely deceiving the type checker into thinking there
|
|
# is just one single descriptor type everywhere. Otherwise, if a superclass
|
|
# has non-memoized and subclass has memoized, that requires
|
|
# "class memoized(non_memoized)". but then if a superclass has memoized and
|
|
# superclass has non-memoized, the class hierarchy of the descriptors
|
|
# would need to be reversed; "class non_memoized(memoized)". so there's no
|
|
# way to achieve this.
|
|
# additional issues, RO properties:
|
|
# https://github.com/python/mypy/issues/12440
|
|
if TYPE_CHECKING:
|
|
# allow memoized and non-memoized to be freely mixed by having them
|
|
# be the same class
|
|
memoized_property = generic_fn_descriptor
|
|
non_memoized_property = generic_fn_descriptor
|
|
|
|
# for read only situations, mypy only sees @property as read only.
|
|
# read only is needed when a subtype specializes the return type
|
|
# of a property, meaning assignment needs to be disallowed
|
|
ro_memoized_property = property
|
|
ro_non_memoized_property = property
|
|
|
|
else:
|
|
memoized_property = ro_memoized_property = _memoized_property
|
|
non_memoized_property = ro_non_memoized_property = _non_memoized_property
|
|
|
|
|
|
def memoized_instancemethod(fn: _F) -> _F:
|
|
"""Decorate a method memoize its return value.
|
|
|
|
Best applied to no-arg methods: memoization is not sensitive to
|
|
argument values, and will always return the same value even when
|
|
called with different arguments.
|
|
|
|
"""
|
|
|
|
def oneshot(self, *args, **kw):
|
|
result = fn(self, *args, **kw)
|
|
|
|
def memo(*a, **kw):
|
|
return result
|
|
|
|
memo.__name__ = fn.__name__
|
|
memo.__doc__ = fn.__doc__
|
|
self.__dict__[fn.__name__] = memo
|
|
return result
|
|
|
|
return update_wrapper(oneshot, fn) # type: ignore
|
|
|
|
|
|
class HasMemoized:
|
|
"""A mixin class that maintains the names of memoized elements in a
|
|
collection for easy cache clearing, generative, etc.
|
|
|
|
"""
|
|
|
|
if not TYPE_CHECKING:
|
|
# support classes that want to have __slots__ with an explicit
|
|
# slot for __dict__. not sure if that requires base __slots__ here.
|
|
__slots__ = ()
|
|
|
|
_memoized_keys: FrozenSet[str] = frozenset()
|
|
|
|
def _reset_memoizations(self) -> None:
|
|
for elem in self._memoized_keys:
|
|
self.__dict__.pop(elem, None)
|
|
|
|
def _assert_no_memoizations(self) -> None:
|
|
for elem in self._memoized_keys:
|
|
assert elem not in self.__dict__
|
|
|
|
def _set_memoized_attribute(self, key: str, value: Any) -> None:
|
|
self.__dict__[key] = value
|
|
self._memoized_keys |= {key}
|
|
|
|
class memoized_attribute(memoized_property[_T]):
|
|
"""A read-only @property that is only evaluated once.
|
|
|
|
:meta private:
|
|
|
|
"""
|
|
|
|
fget: Callable[..., _T]
|
|
__doc__: Optional[str]
|
|
__name__: str
|
|
|
|
def __init__(self, fget: Callable[..., _T], doc: Optional[str] = None):
|
|
self.fget = fget
|
|
self.__doc__ = doc or fget.__doc__
|
|
self.__name__ = fget.__name__
|
|
|
|
@overload
|
|
def __get__(self: _MA, obj: None, cls: Any) -> _MA: ...
|
|
|
|
@overload
|
|
def __get__(self, obj: Any, cls: Any) -> _T: ...
|
|
|
|
def __get__(self, obj, cls):
|
|
if obj is None:
|
|
return self
|
|
obj.__dict__[self.__name__] = result = self.fget(obj)
|
|
obj._memoized_keys |= {self.__name__}
|
|
return result
|
|
|
|
@classmethod
|
|
def memoized_instancemethod(cls, fn: _F) -> _F:
|
|
"""Decorate a method memoize its return value.
|
|
|
|
:meta private:
|
|
|
|
"""
|
|
|
|
def oneshot(self: Any, *args: Any, **kw: Any) -> Any:
|
|
result = fn(self, *args, **kw)
|
|
|
|
def memo(*a, **kw):
|
|
return result
|
|
|
|
memo.__name__ = fn.__name__
|
|
memo.__doc__ = fn.__doc__
|
|
self.__dict__[fn.__name__] = memo
|
|
self._memoized_keys |= {fn.__name__}
|
|
return result
|
|
|
|
return update_wrapper(oneshot, fn) # type: ignore
|
|
|
|
|
|
if TYPE_CHECKING:
|
|
HasMemoized_ro_memoized_attribute = property
|
|
else:
|
|
HasMemoized_ro_memoized_attribute = HasMemoized.memoized_attribute
|
|
|
|
|
|
class MemoizedSlots:
|
|
"""Apply memoized items to an object using a __getattr__ scheme.
|
|
|
|
This allows the functionality of memoized_property and
|
|
memoized_instancemethod to be available to a class using __slots__.
|
|
|
|
"""
|
|
|
|
__slots__ = ()
|
|
|
|
def _fallback_getattr(self, key):
|
|
raise AttributeError(key)
|
|
|
|
def __getattr__(self, key: str) -> Any:
|
|
if key.startswith("_memoized_attr_") or key.startswith(
|
|
"_memoized_method_"
|
|
):
|
|
raise AttributeError(key)
|
|
# to avoid recursion errors when interacting with other __getattr__
|
|
# schemes that refer to this one, when testing for memoized method
|
|
# look at __class__ only rather than going into __getattr__ again.
|
|
elif hasattr(self.__class__, f"_memoized_attr_{key}"):
|
|
value = getattr(self, f"_memoized_attr_{key}")()
|
|
setattr(self, key, value)
|
|
return value
|
|
elif hasattr(self.__class__, f"_memoized_method_{key}"):
|
|
fn = getattr(self, f"_memoized_method_{key}")
|
|
|
|
def oneshot(*args, **kw):
|
|
result = fn(*args, **kw)
|
|
|
|
def memo(*a, **kw):
|
|
return result
|
|
|
|
memo.__name__ = fn.__name__
|
|
memo.__doc__ = fn.__doc__
|
|
setattr(self, key, memo)
|
|
return result
|
|
|
|
oneshot.__doc__ = fn.__doc__
|
|
return oneshot
|
|
else:
|
|
return self._fallback_getattr(key)
|
|
|
|
|
|
# from paste.deploy.converters
|
|
def asbool(obj: Any) -> bool:
|
|
if isinstance(obj, str):
|
|
obj = obj.strip().lower()
|
|
if obj in ["true", "yes", "on", "y", "t", "1"]:
|
|
return True
|
|
elif obj in ["false", "no", "off", "n", "f", "0"]:
|
|
return False
|
|
else:
|
|
raise ValueError("String is not true/false: %r" % obj)
|
|
return bool(obj)
|
|
|
|
|
|
def bool_or_str(*text: str) -> Callable[[str], Union[str, bool]]:
|
|
"""Return a callable that will evaluate a string as
|
|
boolean, or one of a set of "alternate" string values.
|
|
|
|
"""
|
|
|
|
def bool_or_value(obj: str) -> Union[str, bool]:
|
|
if obj in text:
|
|
return obj
|
|
else:
|
|
return asbool(obj)
|
|
|
|
return bool_or_value
|
|
|
|
|
|
def asint(value: Any) -> Optional[int]:
|
|
"""Coerce to integer."""
|
|
|
|
if value is None:
|
|
return value
|
|
return int(value)
|
|
|
|
|
|
def coerce_kw_type(
|
|
kw: Dict[str, Any],
|
|
key: str,
|
|
type_: Type[Any],
|
|
flexi_bool: bool = True,
|
|
dest: Optional[Dict[str, Any]] = None,
|
|
) -> None:
|
|
r"""If 'key' is present in dict 'kw', coerce its value to type 'type\_' if
|
|
necessary. If 'flexi_bool' is True, the string '0' is considered false
|
|
when coercing to boolean.
|
|
"""
|
|
|
|
if dest is None:
|
|
dest = kw
|
|
|
|
if (
|
|
key in kw
|
|
and (not isinstance(type_, type) or not isinstance(kw[key], type_))
|
|
and kw[key] is not None
|
|
):
|
|
if type_ is bool and flexi_bool:
|
|
dest[key] = asbool(kw[key])
|
|
else:
|
|
dest[key] = type_(kw[key])
|
|
|
|
|
|
def constructor_key(obj: Any, cls: Type[Any]) -> Tuple[Any, ...]:
|
|
"""Produce a tuple structure that is cacheable using the __dict__ of
|
|
obj to retrieve values
|
|
|
|
"""
|
|
names = get_cls_kwargs(cls)
|
|
return (cls,) + tuple(
|
|
(k, obj.__dict__[k]) for k in names if k in obj.__dict__
|
|
)
|
|
|
|
|
|
def constructor_copy(obj: _T, cls: Type[_T], *args: Any, **kw: Any) -> _T:
|
|
"""Instantiate cls using the __dict__ of obj as constructor arguments.
|
|
|
|
Uses inspect to match the named arguments of ``cls``.
|
|
|
|
"""
|
|
|
|
names = get_cls_kwargs(cls)
|
|
kw.update(
|
|
(k, obj.__dict__[k]) for k in names.difference(kw) if k in obj.__dict__
|
|
)
|
|
return cls(*args, **kw)
|
|
|
|
|
|
def counter() -> Callable[[], int]:
|
|
"""Return a threadsafe counter function."""
|
|
|
|
lock = threading.Lock()
|
|
counter = itertools.count(1)
|
|
|
|
# avoid the 2to3 "next" transformation...
|
|
def _next():
|
|
with lock:
|
|
return next(counter)
|
|
|
|
return _next
|
|
|
|
|
|
def duck_type_collection(
|
|
specimen: Any, default: Optional[Type[Any]] = None
|
|
) -> Optional[Type[Any]]:
|
|
"""Given an instance or class, guess if it is or is acting as one of
|
|
the basic collection types: list, set and dict. If the __emulates__
|
|
property is present, return that preferentially.
|
|
"""
|
|
|
|
if hasattr(specimen, "__emulates__"):
|
|
# canonicalize set vs sets.Set to a standard: the builtin set
|
|
if specimen.__emulates__ is not None and issubclass(
|
|
specimen.__emulates__, set
|
|
):
|
|
return set
|
|
else:
|
|
return specimen.__emulates__ # type: ignore
|
|
|
|
isa = issubclass if isinstance(specimen, type) else isinstance
|
|
if isa(specimen, list):
|
|
return list
|
|
elif isa(specimen, set):
|
|
return set
|
|
elif isa(specimen, dict):
|
|
return dict
|
|
|
|
if hasattr(specimen, "append"):
|
|
return list
|
|
elif hasattr(specimen, "add"):
|
|
return set
|
|
elif hasattr(specimen, "set"):
|
|
return dict
|
|
else:
|
|
return default
|
|
|
|
|
|
def assert_arg_type(
|
|
arg: Any, argtype: Union[Tuple[Type[Any], ...], Type[Any]], name: str
|
|
) -> Any:
|
|
if isinstance(arg, argtype):
|
|
return arg
|
|
else:
|
|
if isinstance(argtype, tuple):
|
|
raise exc.ArgumentError(
|
|
"Argument '%s' is expected to be one of type %s, got '%s'"
|
|
% (name, " or ".join("'%s'" % a for a in argtype), type(arg))
|
|
)
|
|
else:
|
|
raise exc.ArgumentError(
|
|
"Argument '%s' is expected to be of type '%s', got '%s'"
|
|
% (name, argtype, type(arg))
|
|
)
|
|
|
|
|
|
def dictlike_iteritems(dictlike):
|
|
"""Return a (key, value) iterator for almost any dict-like object."""
|
|
|
|
if hasattr(dictlike, "items"):
|
|
return list(dictlike.items())
|
|
|
|
getter = getattr(dictlike, "__getitem__", getattr(dictlike, "get", None))
|
|
if getter is None:
|
|
raise TypeError("Object '%r' is not dict-like" % dictlike)
|
|
|
|
if hasattr(dictlike, "iterkeys"):
|
|
|
|
def iterator():
|
|
for key in dictlike.iterkeys():
|
|
assert getter is not None
|
|
yield key, getter(key)
|
|
|
|
return iterator()
|
|
elif hasattr(dictlike, "keys"):
|
|
return iter((key, getter(key)) for key in dictlike.keys())
|
|
else:
|
|
raise TypeError("Object '%r' is not dict-like" % dictlike)
|
|
|
|
|
|
class classproperty(property):
|
|
"""A decorator that behaves like @property except that operates
|
|
on classes rather than instances.
|
|
|
|
The decorator is currently special when using the declarative
|
|
module, but note that the
|
|
:class:`~.sqlalchemy.ext.declarative.declared_attr`
|
|
decorator should be used for this purpose with declarative.
|
|
|
|
"""
|
|
|
|
fget: Callable[[Any], Any]
|
|
|
|
def __init__(self, fget: Callable[[Any], Any], *arg: Any, **kw: Any):
|
|
super().__init__(fget, *arg, **kw)
|
|
self.__doc__ = fget.__doc__
|
|
|
|
def __get__(self, obj: Any, cls: Optional[type] = None) -> Any:
|
|
return self.fget(cls)
|
|
|
|
|
|
class hybridproperty(Generic[_T]):
|
|
def __init__(self, func: Callable[..., _T]):
|
|
self.func = func
|
|
self.clslevel = func
|
|
|
|
def __get__(self, instance: Any, owner: Any) -> _T:
|
|
if instance is None:
|
|
clsval = self.clslevel(owner)
|
|
return clsval
|
|
else:
|
|
return self.func(instance)
|
|
|
|
def classlevel(self, func: Callable[..., Any]) -> hybridproperty[_T]:
|
|
self.clslevel = func
|
|
return self
|
|
|
|
|
|
class rw_hybridproperty(Generic[_T]):
|
|
def __init__(self, func: Callable[..., _T]):
|
|
self.func = func
|
|
self.clslevel = func
|
|
self.setfn: Optional[Callable[..., Any]] = None
|
|
|
|
def __get__(self, instance: Any, owner: Any) -> _T:
|
|
if instance is None:
|
|
clsval = self.clslevel(owner)
|
|
return clsval
|
|
else:
|
|
return self.func(instance)
|
|
|
|
def __set__(self, instance: Any, value: Any) -> None:
|
|
assert self.setfn is not None
|
|
self.setfn(instance, value)
|
|
|
|
def setter(self, func: Callable[..., Any]) -> rw_hybridproperty[_T]:
|
|
self.setfn = func
|
|
return self
|
|
|
|
def classlevel(self, func: Callable[..., Any]) -> rw_hybridproperty[_T]:
|
|
self.clslevel = func
|
|
return self
|
|
|
|
|
|
class hybridmethod(Generic[_T]):
|
|
"""Decorate a function as cls- or instance- level."""
|
|
|
|
def __init__(self, func: Callable[..., _T]):
|
|
self.func = self.__func__ = func
|
|
self.clslevel = func
|
|
|
|
def __get__(self, instance: Any, owner: Any) -> Callable[..., _T]:
|
|
if instance is None:
|
|
return self.clslevel.__get__(owner, owner.__class__) # type:ignore
|
|
else:
|
|
return self.func.__get__(instance, owner) # type:ignore
|
|
|
|
def classlevel(self, func: Callable[..., Any]) -> hybridmethod[_T]:
|
|
self.clslevel = func
|
|
return self
|
|
|
|
|
|
class symbol(int):
|
|
"""A constant symbol.
|
|
|
|
>>> symbol('foo') is symbol('foo')
|
|
True
|
|
>>> symbol('foo')
|
|
<symbol 'foo>
|
|
|
|
A slight refinement of the MAGICCOOKIE=object() pattern. The primary
|
|
advantage of symbol() is its repr(). They are also singletons.
|
|
|
|
Repeated calls of symbol('name') will all return the same instance.
|
|
|
|
"""
|
|
|
|
name: str
|
|
|
|
symbols: Dict[str, symbol] = {}
|
|
_lock = threading.Lock()
|
|
|
|
def __new__(
|
|
cls,
|
|
name: str,
|
|
doc: Optional[str] = None,
|
|
canonical: Optional[int] = None,
|
|
) -> symbol:
|
|
with cls._lock:
|
|
sym = cls.symbols.get(name)
|
|
if sym is None:
|
|
assert isinstance(name, str)
|
|
if canonical is None:
|
|
canonical = hash(name)
|
|
sym = int.__new__(symbol, canonical)
|
|
sym.name = name
|
|
if doc:
|
|
sym.__doc__ = doc
|
|
|
|
# NOTE: we should ultimately get rid of this global thing,
|
|
# however, currently it is to support pickling. The best
|
|
# change would be when we are on py3.11 at a minimum, we
|
|
# switch to stdlib enum.IntFlag.
|
|
cls.symbols[name] = sym
|
|
else:
|
|
if canonical and canonical != sym:
|
|
raise TypeError(
|
|
f"Can't replace canonical symbol for {name!r} "
|
|
f"with new int value {canonical}"
|
|
)
|
|
return sym
|
|
|
|
def __reduce__(self):
|
|
return symbol, (self.name, "x", int(self))
|
|
|
|
def __str__(self):
|
|
return repr(self)
|
|
|
|
def __repr__(self):
|
|
return f"symbol({self.name!r})"
|
|
|
|
|
|
class _IntFlagMeta(type):
|
|
def __init__(
|
|
cls,
|
|
classname: str,
|
|
bases: Tuple[Type[Any], ...],
|
|
dict_: Dict[str, Any],
|
|
**kw: Any,
|
|
) -> None:
|
|
items: List[symbol]
|
|
cls._items = items = []
|
|
for k, v in dict_.items():
|
|
if isinstance(v, int):
|
|
sym = symbol(k, canonical=v)
|
|
elif not k.startswith("_"):
|
|
raise TypeError("Expected integer values for IntFlag")
|
|
else:
|
|
continue
|
|
setattr(cls, k, sym)
|
|
items.append(sym)
|
|
|
|
cls.__members__ = _collections.immutabledict(
|
|
{sym.name: sym for sym in items}
|
|
)
|
|
|
|
def __iter__(self) -> Iterator[symbol]:
|
|
raise NotImplementedError(
|
|
"iter not implemented to ensure compatibility with "
|
|
"Python 3.11 IntFlag. Please use __members__. See "
|
|
"https://github.com/python/cpython/issues/99304"
|
|
)
|
|
|
|
|
|
class _FastIntFlag(metaclass=_IntFlagMeta):
|
|
"""An 'IntFlag' copycat that isn't slow when performing bitwise
|
|
operations.
|
|
|
|
the ``FastIntFlag`` class will return ``enum.IntFlag`` under TYPE_CHECKING
|
|
and ``_FastIntFlag`` otherwise.
|
|
|
|
"""
|
|
|
|
|
|
if TYPE_CHECKING:
|
|
from enum import IntFlag
|
|
|
|
FastIntFlag = IntFlag
|
|
else:
|
|
FastIntFlag = _FastIntFlag
|
|
|
|
|
|
_E = TypeVar("_E", bound=enum.Enum)
|
|
|
|
|
|
def parse_user_argument_for_enum(
|
|
arg: Any,
|
|
choices: Dict[_E, List[Any]],
|
|
name: str,
|
|
resolve_symbol_names: bool = False,
|
|
) -> Optional[_E]:
|
|
"""Given a user parameter, parse the parameter into a chosen value
|
|
from a list of choice objects, typically Enum values.
|
|
|
|
The user argument can be a string name that matches the name of a
|
|
symbol, or the symbol object itself, or any number of alternate choices
|
|
such as True/False/ None etc.
|
|
|
|
:param arg: the user argument.
|
|
:param choices: dictionary of enum values to lists of possible
|
|
entries for each.
|
|
:param name: name of the argument. Used in an :class:`.ArgumentError`
|
|
that is raised if the parameter doesn't match any available argument.
|
|
|
|
"""
|
|
for enum_value, choice in choices.items():
|
|
if arg is enum_value:
|
|
return enum_value
|
|
elif resolve_symbol_names and arg == enum_value.name:
|
|
return enum_value
|
|
elif arg in choice:
|
|
return enum_value
|
|
|
|
if arg is None:
|
|
return None
|
|
|
|
raise exc.ArgumentError(f"Invalid value for '{name}': {arg!r}")
|
|
|
|
|
|
_creation_order = 1
|
|
|
|
|
|
def set_creation_order(instance: Any) -> None:
|
|
"""Assign a '_creation_order' sequence to the given instance.
|
|
|
|
This allows multiple instances to be sorted in order of creation
|
|
(typically within a single thread; the counter is not particularly
|
|
threadsafe).
|
|
|
|
"""
|
|
global _creation_order
|
|
instance._creation_order = _creation_order
|
|
_creation_order += 1
|
|
|
|
|
|
def warn_exception(func: Callable[..., Any], *args: Any, **kwargs: Any) -> Any:
|
|
"""executes the given function, catches all exceptions and converts to
|
|
a warning.
|
|
|
|
"""
|
|
try:
|
|
return func(*args, **kwargs)
|
|
except Exception:
|
|
warn("%s('%s') ignored" % sys.exc_info()[0:2])
|
|
|
|
|
|
def ellipses_string(value, len_=25):
|
|
try:
|
|
if len(value) > len_:
|
|
return "%s..." % value[0:len_]
|
|
else:
|
|
return value
|
|
except TypeError:
|
|
return value
|
|
|
|
|
|
class _hash_limit_string(str):
|
|
"""A string subclass that can only be hashed on a maximum amount
|
|
of unique values.
|
|
|
|
This is used for warnings so that we can send out parameterized warnings
|
|
without the __warningregistry__ of the module, or the non-overridable
|
|
"once" registry within warnings.py, overloading memory,
|
|
|
|
|
|
"""
|
|
|
|
_hash: int
|
|
|
|
def __new__(
|
|
cls, value: str, num: int, args: Sequence[Any]
|
|
) -> _hash_limit_string:
|
|
interpolated = (value % args) + (
|
|
" (this warning may be suppressed after %d occurrences)" % num
|
|
)
|
|
self = super().__new__(cls, interpolated)
|
|
self._hash = hash("%s_%d" % (value, hash(interpolated) % num))
|
|
return self
|
|
|
|
def __hash__(self) -> int:
|
|
return self._hash
|
|
|
|
def __eq__(self, other: Any) -> bool:
|
|
return hash(self) == hash(other)
|
|
|
|
|
|
def warn(msg: str, code: Optional[str] = None) -> None:
|
|
"""Issue a warning.
|
|
|
|
If msg is a string, :class:`.exc.SAWarning` is used as
|
|
the category.
|
|
|
|
"""
|
|
if code:
|
|
_warnings_warn(exc.SAWarning(msg, code=code))
|
|
else:
|
|
_warnings_warn(msg, exc.SAWarning)
|
|
|
|
|
|
def warn_limited(msg: str, args: Sequence[Any]) -> None:
|
|
"""Issue a warning with a parameterized string, limiting the number
|
|
of registrations.
|
|
|
|
"""
|
|
if args:
|
|
msg = _hash_limit_string(msg, 10, args)
|
|
_warnings_warn(msg, exc.SAWarning)
|
|
|
|
|
|
_warning_tags: Dict[CodeType, Tuple[str, Type[Warning]]] = {}
|
|
|
|
|
|
def tag_method_for_warnings(
|
|
message: str, category: Type[Warning]
|
|
) -> Callable[[_F], _F]:
|
|
def go(fn):
|
|
_warning_tags[fn.__code__] = (message, category)
|
|
return fn
|
|
|
|
return go
|
|
|
|
|
|
_not_sa_pattern = re.compile(r"^(?:sqlalchemy\.(?!testing)|alembic\.)")
|
|
|
|
|
|
def _warnings_warn(
|
|
message: Union[str, Warning],
|
|
category: Optional[Type[Warning]] = None,
|
|
stacklevel: int = 2,
|
|
) -> None:
|
|
# adjust the given stacklevel to be outside of SQLAlchemy
|
|
try:
|
|
frame = sys._getframe(stacklevel)
|
|
except ValueError:
|
|
# being called from less than 3 (or given) stacklevels, weird,
|
|
# but don't crash
|
|
stacklevel = 0
|
|
except:
|
|
# _getframe() doesn't work, weird interpreter issue, weird,
|
|
# ok, but don't crash
|
|
stacklevel = 0
|
|
else:
|
|
stacklevel_found = warning_tag_found = False
|
|
while frame is not None:
|
|
# using __name__ here requires that we have __name__ in the
|
|
# __globals__ of the decorated string functions we make also.
|
|
# we generate this using {"__name__": fn.__module__}
|
|
if not stacklevel_found and not re.match(
|
|
_not_sa_pattern, frame.f_globals.get("__name__", "")
|
|
):
|
|
# stop incrementing stack level if an out-of-SQLA line
|
|
# were found.
|
|
stacklevel_found = True
|
|
|
|
# however, for the warning tag thing, we have to keep
|
|
# scanning up the whole traceback
|
|
|
|
if frame.f_code in _warning_tags:
|
|
warning_tag_found = True
|
|
(_suffix, _category) = _warning_tags[frame.f_code]
|
|
category = category or _category
|
|
message = f"{message} ({_suffix})"
|
|
|
|
frame = frame.f_back # type: ignore[assignment]
|
|
|
|
if not stacklevel_found:
|
|
stacklevel += 1
|
|
elif stacklevel_found and warning_tag_found:
|
|
break
|
|
|
|
if category is not None:
|
|
warnings.warn(message, category, stacklevel=stacklevel + 1)
|
|
else:
|
|
warnings.warn(message, stacklevel=stacklevel + 1)
|
|
|
|
|
|
def only_once(
|
|
fn: Callable[..., _T], retry_on_exception: bool
|
|
) -> Callable[..., Optional[_T]]:
|
|
"""Decorate the given function to be a no-op after it is called exactly
|
|
once."""
|
|
|
|
once = [fn]
|
|
|
|
def go(*arg: Any, **kw: Any) -> Optional[_T]:
|
|
# strong reference fn so that it isn't garbage collected,
|
|
# which interferes with the event system's expectations
|
|
strong_fn = fn # noqa
|
|
if once:
|
|
once_fn = once.pop()
|
|
try:
|
|
return once_fn(*arg, **kw)
|
|
except:
|
|
if retry_on_exception:
|
|
once.insert(0, once_fn)
|
|
raise
|
|
|
|
return None
|
|
|
|
return go
|
|
|
|
|
|
_SQLA_RE = re.compile(r"sqlalchemy/([a-z_]+/){0,2}[a-z_]+\.py")
|
|
_UNITTEST_RE = re.compile(r"unit(?:2|test2?/)")
|
|
|
|
|
|
def chop_traceback(
|
|
tb: List[str],
|
|
exclude_prefix: re.Pattern[str] = _UNITTEST_RE,
|
|
exclude_suffix: re.Pattern[str] = _SQLA_RE,
|
|
) -> List[str]:
|
|
"""Chop extraneous lines off beginning and end of a traceback.
|
|
|
|
:param tb:
|
|
a list of traceback lines as returned by ``traceback.format_stack()``
|
|
|
|
:param exclude_prefix:
|
|
a regular expression object matching lines to skip at beginning of
|
|
``tb``
|
|
|
|
:param exclude_suffix:
|
|
a regular expression object matching lines to skip at end of ``tb``
|
|
"""
|
|
start = 0
|
|
end = len(tb) - 1
|
|
while start <= end and exclude_prefix.search(tb[start]):
|
|
start += 1
|
|
while start <= end and exclude_suffix.search(tb[end]):
|
|
end -= 1
|
|
return tb[start : end + 1]
|
|
|
|
|
|
NoneType = type(None)
|
|
|
|
|
|
def attrsetter(attrname):
|
|
code = "def set(obj, value): obj.%s = value" % attrname
|
|
env = locals().copy()
|
|
exec(code, env)
|
|
return env["set"]
|
|
|
|
|
|
class TypingOnly:
|
|
"""A mixin class that marks a class as 'typing only', meaning it has
|
|
absolutely no methods, attributes, or runtime functionality whatsoever.
|
|
|
|
"""
|
|
|
|
__slots__ = ()
|
|
|
|
def __init_subclass__(cls) -> None:
|
|
if TypingOnly in cls.__bases__:
|
|
remaining = set(cls.__dict__).difference(
|
|
{
|
|
"__module__",
|
|
"__doc__",
|
|
"__slots__",
|
|
"__orig_bases__",
|
|
"__annotations__",
|
|
}
|
|
)
|
|
if remaining:
|
|
raise AssertionError(
|
|
f"Class {cls} directly inherits TypingOnly but has "
|
|
f"additional attributes {remaining}."
|
|
)
|
|
super().__init_subclass__()
|
|
|
|
|
|
class EnsureKWArg:
|
|
r"""Apply translation of functions to accept \**kw arguments if they
|
|
don't already.
|
|
|
|
Used to ensure cross-compatibility with third party legacy code, for things
|
|
like compiler visit methods that need to accept ``**kw`` arguments,
|
|
but may have been copied from old code that didn't accept them.
|
|
|
|
"""
|
|
|
|
ensure_kwarg: str
|
|
"""a regular expression that indicates method names for which the method
|
|
should accept ``**kw`` arguments.
|
|
|
|
The class will scan for methods matching the name template and decorate
|
|
them if necessary to ensure ``**kw`` parameters are accepted.
|
|
|
|
"""
|
|
|
|
def __init_subclass__(cls) -> None:
|
|
fn_reg = cls.ensure_kwarg
|
|
clsdict = cls.__dict__
|
|
if fn_reg:
|
|
for key in clsdict:
|
|
m = re.match(fn_reg, key)
|
|
if m:
|
|
fn = clsdict[key]
|
|
spec = compat.inspect_getfullargspec(fn)
|
|
if not spec.varkw:
|
|
wrapped = cls._wrap_w_kw(fn)
|
|
setattr(cls, key, wrapped)
|
|
super().__init_subclass__()
|
|
|
|
@classmethod
|
|
def _wrap_w_kw(cls, fn: Callable[..., Any]) -> Callable[..., Any]:
|
|
def wrap(*arg: Any, **kw: Any) -> Any:
|
|
return fn(*arg)
|
|
|
|
return update_wrapper(wrap, fn)
|
|
|
|
|
|
def wrap_callable(wrapper, fn):
|
|
"""Augment functools.update_wrapper() to work with objects with
|
|
a ``__call__()`` method.
|
|
|
|
:param fn:
|
|
object with __call__ method
|
|
|
|
"""
|
|
if hasattr(fn, "__name__"):
|
|
return update_wrapper(wrapper, fn)
|
|
else:
|
|
_f = wrapper
|
|
_f.__name__ = fn.__class__.__name__
|
|
if hasattr(fn, "__module__"):
|
|
_f.__module__ = fn.__module__
|
|
|
|
if hasattr(fn.__call__, "__doc__") and fn.__call__.__doc__:
|
|
_f.__doc__ = fn.__call__.__doc__
|
|
elif fn.__doc__:
|
|
_f.__doc__ = fn.__doc__
|
|
|
|
return _f
|
|
|
|
|
|
def quoted_token_parser(value):
|
|
"""Parse a dotted identifier with accommodation for quoted names.
|
|
|
|
Includes support for SQL-style double quotes as a literal character.
|
|
|
|
E.g.::
|
|
|
|
>>> quoted_token_parser("name")
|
|
["name"]
|
|
>>> quoted_token_parser("schema.name")
|
|
["schema", "name"]
|
|
>>> quoted_token_parser('"Schema"."Name"')
|
|
['Schema', 'Name']
|
|
>>> quoted_token_parser('"Schema"."Name""Foo"')
|
|
['Schema', 'Name""Foo']
|
|
|
|
"""
|
|
|
|
if '"' not in value:
|
|
return value.split(".")
|
|
|
|
# 0 = outside of quotes
|
|
# 1 = inside of quotes
|
|
state = 0
|
|
result: List[List[str]] = [[]]
|
|
idx = 0
|
|
lv = len(value)
|
|
while idx < lv:
|
|
char = value[idx]
|
|
if char == '"':
|
|
if state == 1 and idx < lv - 1 and value[idx + 1] == '"':
|
|
result[-1].append('"')
|
|
idx += 1
|
|
else:
|
|
state ^= 1
|
|
elif char == "." and state == 0:
|
|
result.append([])
|
|
else:
|
|
result[-1].append(char)
|
|
idx += 1
|
|
|
|
return ["".join(token) for token in result]
|
|
|
|
|
|
def add_parameter_text(params: Any, text: str) -> Callable[[_F], _F]:
|
|
params = _collections.to_list(params)
|
|
|
|
def decorate(fn):
|
|
doc = fn.__doc__ is not None and fn.__doc__ or ""
|
|
if doc:
|
|
doc = inject_param_text(doc, {param: text for param in params})
|
|
fn.__doc__ = doc
|
|
return fn
|
|
|
|
return decorate
|
|
|
|
|
|
def _dedent_docstring(text: str) -> str:
|
|
split_text = text.split("\n", 1)
|
|
if len(split_text) == 1:
|
|
return text
|
|
else:
|
|
firstline, remaining = split_text
|
|
if not firstline.startswith(" "):
|
|
return firstline + "\n" + textwrap.dedent(remaining)
|
|
else:
|
|
return textwrap.dedent(text)
|
|
|
|
|
|
def inject_docstring_text(
|
|
given_doctext: Optional[str], injecttext: str, pos: int
|
|
) -> str:
|
|
doctext: str = _dedent_docstring(given_doctext or "")
|
|
lines = doctext.split("\n")
|
|
if len(lines) == 1:
|
|
lines.append("")
|
|
injectlines = textwrap.dedent(injecttext).split("\n")
|
|
if injectlines[0]:
|
|
injectlines.insert(0, "")
|
|
|
|
blanks = [num for num, line in enumerate(lines) if not line.strip()]
|
|
blanks.insert(0, 0)
|
|
|
|
inject_pos = blanks[min(pos, len(blanks) - 1)]
|
|
|
|
lines = lines[0:inject_pos] + injectlines + lines[inject_pos:]
|
|
return "\n".join(lines)
|
|
|
|
|
|
_param_reg = re.compile(r"(\s+):param (.+?):")
|
|
|
|
|
|
def inject_param_text(doctext: str, inject_params: Dict[str, str]) -> str:
|
|
doclines = collections.deque(doctext.splitlines())
|
|
lines = []
|
|
|
|
# TODO: this is not working for params like ":param case_sensitive=True:"
|
|
|
|
to_inject = None
|
|
while doclines:
|
|
line = doclines.popleft()
|
|
|
|
m = _param_reg.match(line)
|
|
|
|
if to_inject is None:
|
|
if m:
|
|
param = m.group(2).lstrip("*")
|
|
if param in inject_params:
|
|
# default indent to that of :param: plus one
|
|
indent = " " * len(m.group(1)) + " "
|
|
|
|
# but if the next line has text, use that line's
|
|
# indentation
|
|
if doclines:
|
|
m2 = re.match(r"(\s+)\S", doclines[0])
|
|
if m2:
|
|
indent = " " * len(m2.group(1))
|
|
|
|
to_inject = indent + inject_params[param]
|
|
elif m:
|
|
lines.extend(["\n", to_inject, "\n"])
|
|
to_inject = None
|
|
elif not line.rstrip():
|
|
lines.extend([line, to_inject, "\n"])
|
|
to_inject = None
|
|
elif line.endswith("::"):
|
|
# TODO: this still won't cover if the code example itself has
|
|
# blank lines in it, need to detect those via indentation.
|
|
lines.extend([line, doclines.popleft()])
|
|
continue
|
|
lines.append(line)
|
|
|
|
return "\n".join(lines)
|
|
|
|
|
|
def repr_tuple_names(names: List[str]) -> Optional[str]:
|
|
"""Trims a list of strings from the middle and return a string of up to
|
|
four elements. Strings greater than 11 characters will be truncated"""
|
|
if len(names) == 0:
|
|
return None
|
|
flag = len(names) <= 4
|
|
names = names[0:4] if flag else names[0:3] + names[-1:]
|
|
res = ["%s.." % name[:11] if len(name) > 11 else name for name in names]
|
|
if flag:
|
|
return ", ".join(res)
|
|
else:
|
|
return "%s, ..., %s" % (", ".join(res[0:3]), res[-1])
|
|
|
|
|
|
def has_compiled_ext(raise_=False):
|
|
if HAS_CYEXTENSION:
|
|
return True
|
|
elif raise_:
|
|
raise ImportError(
|
|
"cython extensions were expected to be installed, "
|
|
"but are not present"
|
|
)
|
|
else:
|
|
return False
|