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# util/deprecations.py
# Copyright (C) 2005-2017 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 .. 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(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
return decorated
import textwrap
def _dedent_docstring(text):
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(doctext, injecttext, pos):
doctext = _dedent_docstring(doctext or "")
lines = doctext.split('\n')
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)
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