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# util/deprecations.py
# Copyright (C) 2005-2011 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."""
from sqlalchemy import exc
import warnings
import re
from langhelpers import decorator
def warn_deprecated(msg, stacklevel=3):
warnings.warn(msg, exc.SADeprecationWarning, stacklevel=stacklevel)
def warn_pending_deprecation(msg, stacklevel=3):
warnings.warn(msg, exc.SAPendingDeprecationWarning, stacklevel=stacklevel)
def deprecated(version, message=None, add_deprecation_to_docstring=True):
"""Decorates a function and issues a deprecation warning on use.
: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 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.
: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 (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 _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+)\:`~?\.?(.+?)`', repl, text)
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(wtype(message), 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__)
docs = doc and doc.expandtabs().split('\n') or []
indent = ''
for line in docs[1:]:
text = line.lstrip()
if text:
indent = line[0:len(line) - len(text)]
break
point = min(len(docs), 1)
docs.insert(point, '\n' + indent + docstring_header.rstrip())
doc = '\n'.join(docs)
decorated = warned(func)
decorated.__doc__ = doc
return decorated
|
