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File Name : deprecations.py

# util/deprecations.py
# Copyright (C) 2005-2021 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php

"""Helpers related to deprecation of functions, methods, classes, other
functionality."""

import re
import warnings

from . import compat
from .langhelpers import _hash_limit_string
from .langhelpers import decorator
from .langhelpers import inject_docstring_text
from .langhelpers import inject_param_text
from .. import exc

def warn_deprecated(msg, stacklevel=3):
    warnings.warn(msg, exc.SADeprecationWarning, stacklevel=stacklevel)

def warn_deprecated_limited(msg, args, stacklevel=3):
    """Issue a deprecation warning with a parameterized string,
    limiting the number of registrations.

"""
    if args:
        msg = _hash_limit_string(msg, 10, args)
    warnings.warn(msg, exc.SADeprecationWarning, stacklevel)

def warn_pending_deprecation(msg, stacklevel=3):
    warnings.warn(msg, exc.SAPendingDeprecationWarning, stacklevel=stacklevel)

def deprecated_cls(version, message, constructor="__init__"):
    header = ".. deprecated:: %s %s" % (version, (message or ""))

def decorate(cls):
        return _decorate_cls_with_warning(
            cls,
            constructor,
            exc.SADeprecationWarning,
            message % dict(func=constructor),
            header,
        )

return decorate

def deprecated(version, message=None, add_deprecation_to_docstring=True):
    """Decorates a function and issues a deprecation warning on use.

:param version:
      Issue version in the warning.

:param message:
      If provided, issue message in the warning.  A sensible default
      is used if not provided.

:param add_deprecation_to_docstring:
      Default True.  If False, the wrapped function's __doc__ is left
      as-is.  If True, the 'message' is prepended to the docs if
      provided, or sensible default if message is omitted.

"""

if add_deprecation_to_docstring:
        header = ".. deprecated:: %s %s" % (version, (message or ""))
    else:
        header = None

if message is None:
        message = "Call to deprecated function %(func)s"

def decorate(fn):
        return _decorate_with_warning(
            fn,
            exc.SADeprecationWarning,
            message % dict(func=fn.__name__),
            header,
        )

return decorate

def deprecated_params(**specs):
    """Decorates a function to warn on use of certain parameters.

e.g. ::

@deprecated_params(
            weak_identity_map=(
                "0.7",
                "the :paramref:`.Session.weak_identity_map parameter "
                "is deprecated."
            )

)

"""

messages = {}
    for param, (version, message) in specs.items():
        messages[param] = _sanitize_restructured_text(message)

def decorate(fn):
        spec = compat.inspect_getfullargspec(fn)
        if spec.defaults is not None:
            defaults = dict(
                zip(
                    spec.args[(len(spec.args) - len(spec.defaults)) :],
                    spec.defaults,
                )
            )
            check_defaults = set(defaults).intersection(messages)
            check_kw = set(messages).difference(defaults)
        else:
            check_defaults = ()
            check_kw = set(messages)

@decorator
        def warned(fn, *args, **kwargs):
            for m in check_defaults:
                if kwargs[m] != defaults[m]:
                    warnings.warn(
                        messages[m], exc.SADeprecationWarning, stacklevel=3
                    )
            for m in check_kw:
                if m in kwargs:
                    warnings.warn(
                        messages[m], exc.SADeprecationWarning, stacklevel=3
                    )

return fn(*args, **kwargs)

doc = fn.__doc__ is not None and fn.__doc__ or ""
        if doc:
            doc = inject_param_text(
                doc,
                {
                    param: ".. deprecated:: %s %s" % (version, (message or ""))
                    for param, (version, message) in specs.items()
                },
            )
        decorated = warned(fn)
        decorated.__doc__ = doc
        return decorated

return decorate

def pending_deprecation(
    version, message=None, add_deprecation_to_docstring=True
):
    """Decorates a function and issues a pending deprecation warning on use.

:param version:
      An approximate future version at which point the pending deprecation
      will become deprecated.  Not used in messaging.

:param message:
      If provided, issue message in the warning.  A sensible default
      is used if not provided.

if add_deprecation_to_docstring:
        header = ".. deprecated:: %s (pending) %s" % (version, (message or ""))
    else:
        header = None

if message is None:
        message = "Call to deprecated function %(func)s"

def decorate(fn):
        return _decorate_with_warning(
            fn,
            exc.SAPendingDeprecationWarning,
            message % dict(func=fn.__name__),
            header,
        )

return decorate

def deprecated_option_value(parameter_value, default_value, warning_text):
    if parameter_value is None:
        return default_value
    else:
        warn_deprecated(warning_text)
        return parameter_value

def _sanitize_restructured_text(text):
    def repl(m):
        type_, name = m.group(1, 2)
        if type_ in ("func", "meth"):
            name += "()"
        return name

return re.sub(r"\:(\w+)\:`~?(?:_\w+)?\.?(.+?)`", repl, text)

def _decorate_cls_with_warning(
    cls, constructor, wtype, message, docstring_header=None
):
    doc = cls.__doc__ is not None and cls.__doc__ or ""
    if docstring_header is not None:
        docstring_header %= dict(func=constructor)

doc = inject_docstring_text(doc, docstring_header, 1)

if type(cls) is type:
            clsdict = dict(cls.__dict__)
            clsdict["__doc__"] = doc
            cls = type(cls.__name__, cls.__bases__, clsdict)
            constructor_fn = clsdict[constructor]
        else:
            cls.__doc__ = doc
            constructor_fn = getattr(cls, constructor)

setattr(
        cls,
        constructor,
        _decorate_with_warning(constructor_fn, wtype, message, None),
    )

return cls

def _decorate_with_warning(func, wtype, message, docstring_header=None):
    """Wrap a function with a warnings.warn and augmented docstring."""

message = _sanitize_restructured_text(message)

@decorator
    def warned(fn, *args, **kwargs):
        warnings.warn(message, wtype, stacklevel=3)
        return fn(*args, **kwargs)

doc = func.__doc__ is not None and func.__doc__ or ""
    if docstring_header is not None:
        docstring_header %= dict(func=func.__name__)

doc = inject_docstring_text(doc, docstring_header, 1)

decorated = warned(func)
    decorated.__doc__ = doc
    decorated._sa_warn = lambda: warnings.warn(message, wtype, stacklevel=3)
    return decorated

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deprecations.py	text/x-script.python	7.3 KB	root/root	0644	2025-04-17 01:10:58
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