mirror of
https://github.com/sphinx-doc/sphinx.git
synced 2025-02-25 18:55:22 -06:00
664 lines
23 KiB
Python
664 lines
23 KiB
Python
"""
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sphinx.util.inspect
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~~~~~~~~~~~~~~~~~~~
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Helpers for inspecting Python modules.
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:copyright: Copyright 2007-2020 by the Sphinx team, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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import builtins
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import contextlib
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import enum
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import inspect
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import re
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import sys
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import types
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import typing
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import warnings
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from functools import partial, partialmethod
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from inspect import ( # NOQA
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Parameter, isclass, ismethod, ismethoddescriptor, ismodule
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)
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from io import StringIO
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from typing import Any, Callable, Dict
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from typing import cast
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from sphinx.deprecation import RemovedInSphinx50Warning
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from sphinx.pycode.ast import ast # for py36-37
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from sphinx.pycode.ast import unparse as ast_unparse
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from sphinx.util import logging
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from sphinx.util.typing import ForwardRef
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from sphinx.util.typing import stringify as stringify_annotation
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if sys.version_info > (3, 7):
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from types import (
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ClassMethodDescriptorType,
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MethodDescriptorType,
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WrapperDescriptorType
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)
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else:
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ClassMethodDescriptorType = type(object.__init__)
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MethodDescriptorType = type(str.join)
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WrapperDescriptorType = type(dict.__dict__['fromkeys'])
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logger = logging.getLogger(__name__)
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memory_address_re = re.compile(r' at 0x[0-9a-f]{8,16}(?=>)', re.IGNORECASE)
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# Copied from the definition of inspect.getfullargspec from Python master,
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# and modified to remove the use of special flags that break decorated
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# callables and bound methods in the name of backwards compatibility. Used
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# under the terms of PSF license v2, which requires the above statement
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# and the following:
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#
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# Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009,
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# 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 Python Software
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# Foundation; All Rights Reserved
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def getargspec(func: Callable) -> Any:
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"""Like inspect.getfullargspec but supports bound methods, and wrapped
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methods."""
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warnings.warn('sphinx.ext.inspect.getargspec() is deprecated',
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RemovedInSphinx50Warning, stacklevel=2)
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# On 3.5+, signature(int) or similar raises ValueError. On 3.4, it
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# succeeds with a bogus signature. We want a TypeError uniformly, to
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# match historical behavior.
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if (isinstance(func, type) and
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is_builtin_class_method(func, "__new__") and
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is_builtin_class_method(func, "__init__")):
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raise TypeError(
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"can't compute signature for built-in type {}".format(func))
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sig = inspect.signature(func)
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args = []
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varargs = None
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varkw = None
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kwonlyargs = []
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defaults = ()
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annotations = {}
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defaults = ()
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kwdefaults = {}
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if sig.return_annotation is not sig.empty:
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annotations['return'] = sig.return_annotation
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for param in sig.parameters.values():
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kind = param.kind
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name = param.name
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if kind is Parameter.POSITIONAL_ONLY:
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args.append(name)
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elif kind is Parameter.POSITIONAL_OR_KEYWORD:
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args.append(name)
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if param.default is not param.empty:
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defaults += (param.default,) # type: ignore
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elif kind is Parameter.VAR_POSITIONAL:
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varargs = name
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elif kind is Parameter.KEYWORD_ONLY:
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kwonlyargs.append(name)
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if param.default is not param.empty:
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kwdefaults[name] = param.default
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elif kind is Parameter.VAR_KEYWORD:
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varkw = name
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if param.annotation is not param.empty:
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annotations[name] = param.annotation
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if not kwdefaults:
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# compatibility with 'func.__kwdefaults__'
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kwdefaults = None
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if not defaults:
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# compatibility with 'func.__defaults__'
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defaults = None
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return inspect.FullArgSpec(args, varargs, varkw, defaults,
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kwonlyargs, kwdefaults, annotations)
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def unwrap(obj: Any) -> Any:
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"""Get an original object from wrapped object (wrapped functions)."""
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try:
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return inspect.unwrap(obj)
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except ValueError:
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# might be a mock object
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return obj
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def unwrap_all(obj: Any, *, stop: Callable = None) -> Any:
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"""
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Get an original object from wrapped object (unwrapping partials, wrapped
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functions, and other decorators).
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"""
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while True:
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if stop and stop(obj):
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return obj
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elif ispartial(obj):
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obj = obj.func
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elif inspect.isroutine(obj) and hasattr(obj, '__wrapped__'):
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obj = obj.__wrapped__
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elif isclassmethod(obj):
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obj = obj.__func__
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elif isstaticmethod(obj):
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obj = obj.__func__
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else:
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return obj
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def isenumclass(x: Any) -> bool:
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"""Check if the object is subclass of enum."""
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return inspect.isclass(x) and issubclass(x, enum.Enum)
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def isenumattribute(x: Any) -> bool:
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"""Check if the object is attribute of enum."""
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return isinstance(x, enum.Enum)
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def unpartial(obj: Any) -> Any:
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"""Get an original object from partial object.
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This returns given object itself if not partial.
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"""
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while ispartial(obj):
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obj = obj.func
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return obj
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def ispartial(obj: Any) -> bool:
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"""Check if the object is partial."""
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return isinstance(obj, (partial, partialmethod))
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def isclassmethod(obj: Any) -> bool:
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"""Check if the object is classmethod."""
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if isinstance(obj, classmethod):
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return True
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elif inspect.ismethod(obj) and obj.__self__ is not None and isclass(obj.__self__):
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return True
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return False
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def isstaticmethod(obj: Any, cls: Any = None, name: str = None) -> bool:
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"""Check if the object is staticmethod."""
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if isinstance(obj, staticmethod):
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return True
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elif cls and name:
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# trace __mro__ if the method is defined in parent class
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#
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# .. note:: This only works well with new style classes.
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for basecls in getattr(cls, '__mro__', [cls]):
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meth = basecls.__dict__.get(name)
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if meth:
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if isinstance(meth, staticmethod):
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return True
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else:
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return False
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return False
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def isdescriptor(x: Any) -> bool:
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"""Check if the object is some kind of descriptor."""
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for item in '__get__', '__set__', '__delete__':
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if hasattr(safe_getattr(x, item, None), '__call__'):
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return True
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return False
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def isabstractmethod(obj: Any) -> bool:
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"""Check if the object is an abstractmethod."""
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return safe_getattr(obj, '__isabstractmethod__', False) is True
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def is_cython_function_or_method(obj: Any) -> bool:
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"""Check if the object is a function or method in cython."""
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try:
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return obj.__class__.__name__ == 'cython_function_or_method'
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except AttributeError:
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return False
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def isattributedescriptor(obj: Any) -> bool:
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"""Check if the object is an attribute like descriptor."""
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if inspect.isdatadescriptor(obj):
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# data descriptor is kind of attribute
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return True
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elif isdescriptor(obj):
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# non data descriptor
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unwrapped = unwrap(obj)
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if isfunction(unwrapped) or isbuiltin(unwrapped) or inspect.ismethod(unwrapped):
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# attribute must not be either function, builtin and method
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return False
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elif is_cython_function_or_method(unwrapped):
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# attribute must not be either function and method (for cython)
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return False
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elif inspect.isclass(unwrapped):
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# attribute must not be a class
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return False
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elif isinstance(unwrapped, (ClassMethodDescriptorType,
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MethodDescriptorType,
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WrapperDescriptorType)):
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# attribute must not be a method descriptor
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return False
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elif type(unwrapped).__name__ == "instancemethod":
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# attribute must not be an instancemethod (C-API)
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return False
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else:
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return True
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else:
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return False
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def is_singledispatch_function(obj: Any) -> bool:
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"""Check if the object is singledispatch function."""
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if (inspect.isfunction(obj) and
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hasattr(obj, 'dispatch') and
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hasattr(obj, 'register') and
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obj.dispatch.__module__ == 'functools'):
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return True
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else:
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return False
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def is_singledispatch_method(obj: Any) -> bool:
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"""Check if the object is singledispatch method."""
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try:
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from functools import singledispatchmethod # type: ignore
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return isinstance(obj, singledispatchmethod)
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except ImportError: # py35-37
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return False
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def isfunction(obj: Any) -> bool:
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"""Check if the object is function."""
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return inspect.isfunction(unwrap_all(obj))
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def isbuiltin(obj: Any) -> bool:
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"""Check if the object is builtin."""
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return inspect.isbuiltin(unwrap_all(obj))
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def isroutine(obj: Any) -> bool:
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"""Check is any kind of function or method."""
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return inspect.isroutine(unwrap_all(obj))
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def iscoroutinefunction(obj: Any) -> bool:
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"""Check if the object is coroutine-function."""
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# unwrap staticmethod, classmethod and partial (except wrappers)
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obj = unwrap_all(obj, stop=lambda o: hasattr(o, '__wrapped__'))
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if hasattr(obj, '__code__') and inspect.iscoroutinefunction(obj):
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# check obj.__code__ because iscoroutinefunction() crashes for custom method-like
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# objects (see https://github.com/sphinx-doc/sphinx/issues/6605)
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return True
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else:
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return False
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def isproperty(obj: Any) -> bool:
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"""Check if the object is property."""
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return isinstance(obj, property)
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def isgenericalias(obj: Any) -> bool:
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"""Check if the object is GenericAlias."""
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if (hasattr(typing, '_GenericAlias') and # only for py37+
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isinstance(obj, typing._GenericAlias)): # type: ignore
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return True
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elif (hasattr(types, 'GenericAlias') and # only for py39+
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isinstance(obj, types.GenericAlias)): # type: ignore
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return True
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else:
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return False
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|
|
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def safe_getattr(obj: Any, name: str, *defargs: Any) -> Any:
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"""A getattr() that turns all exceptions into AttributeErrors."""
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try:
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return getattr(obj, name, *defargs)
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except Exception as exc:
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# sometimes accessing a property raises an exception (e.g.
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# NotImplementedError), so let's try to read the attribute directly
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try:
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# In case the object does weird things with attribute access
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# such that accessing `obj.__dict__` may raise an exception
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return obj.__dict__[name]
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except Exception:
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pass
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# this is a catch-all for all the weird things that some modules do
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# with attribute access
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if defargs:
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return defargs[0]
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raise AttributeError(name) from exc
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|
|
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def object_description(object: Any) -> str:
|
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"""A repr() implementation that returns text safe to use in reST context."""
|
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if isinstance(object, dict):
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try:
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sorted_keys = sorted(object)
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except Exception:
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pass # Cannot sort dict keys, fall back to generic repr
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else:
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items = ("%s: %s" %
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(object_description(key), object_description(object[key]))
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for key in sorted_keys)
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return "{%s}" % ", ".join(items)
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if isinstance(object, set):
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try:
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sorted_values = sorted(object)
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except TypeError:
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pass # Cannot sort set values, fall back to generic repr
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else:
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return "{%s}" % ", ".join(object_description(x) for x in sorted_values)
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if isinstance(object, frozenset):
|
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try:
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sorted_values = sorted(object)
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except TypeError:
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pass # Cannot sort frozenset values, fall back to generic repr
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|
else:
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return "frozenset({%s})" % ", ".join(object_description(x)
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for x in sorted_values)
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try:
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s = repr(object)
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except Exception as exc:
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raise ValueError from exc
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|
# Strip non-deterministic memory addresses such as
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# ``<__main__.A at 0x7f68cb685710>``
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s = memory_address_re.sub('', s)
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return s.replace('\n', ' ')
|
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|
|
|
|
def is_builtin_class_method(obj: Any, attr_name: str) -> bool:
|
|
"""If attr_name is implemented at builtin class, return True.
|
|
|
|
>>> is_builtin_class_method(int, '__init__')
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True
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|
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Why this function needed? CPython implements int.__init__ by Descriptor
|
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but PyPy implements it by pure Python code.
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"""
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try:
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mro = inspect.getmro(obj)
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except AttributeError:
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# no __mro__, assume the object has no methods as we know them
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return False
|
|
|
|
try:
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cls = next(c for c in mro if attr_name in safe_getattr(c, '__dict__', {}))
|
|
except StopIteration:
|
|
return False
|
|
|
|
try:
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name = safe_getattr(cls, '__name__')
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|
except AttributeError:
|
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return False
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|
|
|
return getattr(builtins, name, None) is cls
|
|
|
|
|
|
def _should_unwrap(subject: Callable) -> bool:
|
|
"""Check the function should be unwrapped on getting signature."""
|
|
if (safe_getattr(subject, '__globals__', None) and
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subject.__globals__.get('__name__') == 'contextlib' and # type: ignore
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subject.__globals__.get('__file__') == contextlib.__file__): # type: ignore
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# contextmanger should be unwrapped
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return True
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|
|
|
return False
|
|
|
|
|
|
def signature(subject: Callable, bound_method: bool = False, follow_wrapped: bool = False
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|
) -> inspect.Signature:
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|
"""Return a Signature object for the given *subject*.
|
|
|
|
:param bound_method: Specify *subject* is a bound method or not
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|
:param follow_wrapped: Same as ``inspect.signature()``.
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Defaults to ``False`` (get a signature of *subject*).
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"""
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try:
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|
try:
|
|
if _should_unwrap(subject):
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signature = inspect.signature(subject)
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|
else:
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|
signature = inspect.signature(subject, follow_wrapped=follow_wrapped)
|
|
except ValueError:
|
|
# follow built-in wrappers up (ex. functools.lru_cache)
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|
signature = inspect.signature(subject)
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|
parameters = list(signature.parameters.values())
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|
return_annotation = signature.return_annotation
|
|
except IndexError:
|
|
# Until python 3.6.4, cpython has been crashed on inspection for
|
|
# partialmethods not having any arguments.
|
|
# https://bugs.python.org/issue33009
|
|
if hasattr(subject, '_partialmethod'):
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|
parameters = []
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|
return_annotation = Parameter.empty
|
|
else:
|
|
raise
|
|
|
|
try:
|
|
# Update unresolved annotations using ``get_type_hints()``.
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|
annotations = typing.get_type_hints(subject)
|
|
for i, param in enumerate(parameters):
|
|
if isinstance(param.annotation, str) and param.name in annotations:
|
|
parameters[i] = param.replace(annotation=annotations[param.name])
|
|
if 'return' in annotations:
|
|
return_annotation = annotations['return']
|
|
except Exception:
|
|
# ``get_type_hints()`` does not support some kind of objects like partial,
|
|
# ForwardRef and so on.
|
|
pass
|
|
|
|
if bound_method:
|
|
if inspect.ismethod(subject):
|
|
# ``inspect.signature()`` considers the subject is a bound method and removes
|
|
# first argument from signature. Therefore no skips are needed here.
|
|
pass
|
|
else:
|
|
if len(parameters) > 0:
|
|
parameters.pop(0)
|
|
|
|
# To allow to create signature object correctly for pure python functions,
|
|
# pass an internal parameter __validate_parameters__=False to Signature
|
|
#
|
|
# For example, this helps a function having a default value `inspect._empty`.
|
|
# refs: https://github.com/sphinx-doc/sphinx/issues/7935
|
|
return inspect.Signature(parameters, return_annotation=return_annotation, # type: ignore
|
|
__validate_parameters__=False)
|
|
|
|
|
|
def evaluate_signature(sig: inspect.Signature, globalns: Dict = None, localns: Dict = None
|
|
) -> inspect.Signature:
|
|
"""Evaluate unresolved type annotations in a signature object."""
|
|
def evaluate(annotation: Any, globalns: Dict, localns: Dict) -> Any:
|
|
"""Evaluate unresolved type annotation."""
|
|
try:
|
|
if isinstance(annotation, str):
|
|
ref = ForwardRef(annotation, True)
|
|
annotation = ref._evaluate(globalns, localns)
|
|
|
|
if isinstance(annotation, ForwardRef):
|
|
annotation = annotation._evaluate(globalns, localns)
|
|
elif isinstance(annotation, str):
|
|
# might be a ForwardRef'ed annotation in overloaded functions
|
|
ref = ForwardRef(annotation, True)
|
|
annotation = ref._evaluate(globalns, localns)
|
|
except (NameError, TypeError):
|
|
# failed to evaluate type. skipped.
|
|
pass
|
|
|
|
return annotation
|
|
|
|
if globalns is None:
|
|
globalns = {}
|
|
if localns is None:
|
|
localns = globalns
|
|
|
|
parameters = list(sig.parameters.values())
|
|
for i, param in enumerate(parameters):
|
|
if param.annotation:
|
|
annotation = evaluate(param.annotation, globalns, localns)
|
|
parameters[i] = param.replace(annotation=annotation)
|
|
|
|
return_annotation = sig.return_annotation
|
|
if return_annotation:
|
|
return_annotation = evaluate(return_annotation, globalns, localns)
|
|
|
|
return sig.replace(parameters=parameters, return_annotation=return_annotation)
|
|
|
|
|
|
def stringify_signature(sig: inspect.Signature, show_annotation: bool = True,
|
|
show_return_annotation: bool = True) -> str:
|
|
"""Stringify a Signature object.
|
|
|
|
:param show_annotation: Show annotation in result
|
|
"""
|
|
args = []
|
|
last_kind = None
|
|
for param in sig.parameters.values():
|
|
if param.kind != param.POSITIONAL_ONLY and last_kind == param.POSITIONAL_ONLY:
|
|
# PEP-570: Separator for Positional Only Parameter: /
|
|
args.append('/')
|
|
if param.kind == param.KEYWORD_ONLY and last_kind in (param.POSITIONAL_OR_KEYWORD,
|
|
param.POSITIONAL_ONLY,
|
|
None):
|
|
# PEP-3102: Separator for Keyword Only Parameter: *
|
|
args.append('*')
|
|
|
|
arg = StringIO()
|
|
if param.kind == param.VAR_POSITIONAL:
|
|
arg.write('*' + param.name)
|
|
elif param.kind == param.VAR_KEYWORD:
|
|
arg.write('**' + param.name)
|
|
else:
|
|
arg.write(param.name)
|
|
|
|
if show_annotation and param.annotation is not param.empty:
|
|
arg.write(': ')
|
|
arg.write(stringify_annotation(param.annotation))
|
|
if param.default is not param.empty:
|
|
if show_annotation and param.annotation is not param.empty:
|
|
arg.write(' = ')
|
|
else:
|
|
arg.write('=')
|
|
arg.write(object_description(param.default))
|
|
|
|
args.append(arg.getvalue())
|
|
last_kind = param.kind
|
|
|
|
if last_kind == Parameter.POSITIONAL_ONLY:
|
|
# PEP-570: Separator for Positional Only Parameter: /
|
|
args.append('/')
|
|
|
|
if (sig.return_annotation is Parameter.empty or
|
|
show_annotation is False or
|
|
show_return_annotation is False):
|
|
return '(%s)' % ', '.join(args)
|
|
else:
|
|
annotation = stringify_annotation(sig.return_annotation)
|
|
return '(%s) -> %s' % (', '.join(args), annotation)
|
|
|
|
|
|
def signature_from_str(signature: str) -> inspect.Signature:
|
|
"""Create a Signature object from string."""
|
|
module = ast.parse('def func' + signature + ': pass')
|
|
function = cast(ast.FunctionDef, module.body[0]) # type: ignore
|
|
|
|
return signature_from_ast(function)
|
|
|
|
|
|
def signature_from_ast(node: ast.FunctionDef) -> inspect.Signature:
|
|
"""Create a Signature object from AST *node*."""
|
|
args = node.args
|
|
defaults = list(args.defaults)
|
|
params = []
|
|
if hasattr(args, "posonlyargs"):
|
|
posonlyargs = len(args.posonlyargs) # type: ignore
|
|
positionals = posonlyargs + len(args.args)
|
|
else:
|
|
posonlyargs = 0
|
|
positionals = len(args.args)
|
|
|
|
for _ in range(len(defaults), positionals):
|
|
defaults.insert(0, Parameter.empty)
|
|
|
|
if hasattr(args, "posonlyargs"):
|
|
for i, arg in enumerate(args.posonlyargs): # type: ignore
|
|
if defaults[i] is Parameter.empty:
|
|
default = Parameter.empty
|
|
else:
|
|
default = ast_unparse(defaults[i])
|
|
|
|
annotation = ast_unparse(arg.annotation) or Parameter.empty
|
|
params.append(Parameter(arg.arg, Parameter.POSITIONAL_ONLY,
|
|
default=default, annotation=annotation))
|
|
|
|
for i, arg in enumerate(args.args):
|
|
if defaults[i + posonlyargs] is Parameter.empty:
|
|
default = Parameter.empty
|
|
else:
|
|
default = ast_unparse(defaults[i + posonlyargs])
|
|
|
|
annotation = ast_unparse(arg.annotation) or Parameter.empty
|
|
params.append(Parameter(arg.arg, Parameter.POSITIONAL_OR_KEYWORD,
|
|
default=default, annotation=annotation))
|
|
|
|
if args.vararg:
|
|
annotation = ast_unparse(args.vararg.annotation) or Parameter.empty
|
|
params.append(Parameter(args.vararg.arg, Parameter.VAR_POSITIONAL,
|
|
annotation=annotation))
|
|
|
|
for i, arg in enumerate(args.kwonlyargs):
|
|
default = ast_unparse(args.kw_defaults[i]) or Parameter.empty
|
|
annotation = ast_unparse(arg.annotation) or Parameter.empty
|
|
params.append(Parameter(arg.arg, Parameter.KEYWORD_ONLY, default=default,
|
|
annotation=annotation))
|
|
|
|
if args.kwarg:
|
|
annotation = ast_unparse(args.kwarg.annotation) or Parameter.empty
|
|
params.append(Parameter(args.kwarg.arg, Parameter.VAR_KEYWORD,
|
|
annotation=annotation))
|
|
|
|
return_annotation = ast_unparse(node.returns) or Parameter.empty
|
|
|
|
return inspect.Signature(params, return_annotation=return_annotation)
|
|
|
|
|
|
def getdoc(obj: Any, attrgetter: Callable = safe_getattr,
|
|
allow_inherited: bool = False, cls: Any = None, name: str = None) -> str:
|
|
"""Get the docstring for the object.
|
|
|
|
This tries to obtain the docstring for some kind of objects additionally:
|
|
|
|
* partial functions
|
|
* inherited docstring
|
|
* inherited decorated methods
|
|
"""
|
|
doc = attrgetter(obj, '__doc__', None)
|
|
if ispartial(obj) and doc == obj.__class__.__doc__:
|
|
return getdoc(obj.func)
|
|
elif doc is None and allow_inherited:
|
|
doc = inspect.getdoc(obj)
|
|
|
|
if doc is None and cls:
|
|
# inspect.getdoc() does not support some kind of inherited and decorated methods.
|
|
# This tries to obtain the docstring from super classes.
|
|
for basecls in getattr(cls, '__mro__', []):
|
|
meth = safe_getattr(basecls, name, None)
|
|
if meth is not None:
|
|
doc = inspect.getdoc(meth)
|
|
if doc:
|
|
break
|
|
|
|
return doc
|