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143 lines
4.3 KiB
Python
143 lines
4.3 KiB
Python
# util/deprecations.py
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# Copyright (C) 2005-2014 the SQLAlchemy authors and contributors <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: http://www.opensource.org/licenses/mit-license.php
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"""Helpers related to deprecation of functions, methods, classes, other
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functionality."""
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from .. import exc
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import warnings
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import re
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from .langhelpers import decorator
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def warn_deprecated(msg, stacklevel=3):
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warnings.warn(msg, exc.SADeprecationWarning, stacklevel=stacklevel)
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def warn_pending_deprecation(msg, stacklevel=3):
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warnings.warn(msg, exc.SAPendingDeprecationWarning, stacklevel=stacklevel)
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def deprecated(version, message=None, add_deprecation_to_docstring=True):
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"""Decorates a function and issues a deprecation warning on use.
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:param message:
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If provided, issue message in the warning. A sensible default
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is used if not provided.
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:param add_deprecation_to_docstring:
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Default True. If False, the wrapped function's __doc__ is left
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as-is. If True, the 'message' is prepended to the docs if
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provided, or sensible default if message is omitted.
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"""
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if add_deprecation_to_docstring:
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header = ".. deprecated:: %s %s" % \
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(version, (message or ''))
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else:
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header = None
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if message is None:
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message = "Call to deprecated function %(func)s"
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def decorate(fn):
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return _decorate_with_warning(
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fn, exc.SADeprecationWarning,
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message % dict(func=fn.__name__), header)
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return decorate
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def pending_deprecation(version, message=None,
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add_deprecation_to_docstring=True):
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"""Decorates a function and issues a pending deprecation warning on use.
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:param version:
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An approximate future version at which point the pending deprecation
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will become deprecated. Not used in messaging.
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:param message:
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If provided, issue message in the warning. A sensible default
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is used if not provided.
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:param add_deprecation_to_docstring:
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Default True. If False, the wrapped function's __doc__ is left
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as-is. If True, the 'message' is prepended to the docs if
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provided, or sensible default if message is omitted.
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"""
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if add_deprecation_to_docstring:
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header = ".. deprecated:: %s (pending) %s" % \
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(version, (message or ''))
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else:
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header = None
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if message is None:
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message = "Call to deprecated function %(func)s"
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def decorate(fn):
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return _decorate_with_warning(
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fn, exc.SAPendingDeprecationWarning,
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message % dict(func=fn.__name__), header)
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return decorate
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def _sanitize_restructured_text(text):
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def repl(m):
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type_, name = m.group(1, 2)
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if type_ in ("func", "meth"):
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name += "()"
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return name
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return re.sub(r'\:(\w+)\:`~?\.?(.+?)`', repl, text)
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def _decorate_with_warning(func, wtype, message, docstring_header=None):
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"""Wrap a function with a warnings.warn and augmented docstring."""
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message = _sanitize_restructured_text(message)
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@decorator
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def warned(fn, *args, **kwargs):
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warnings.warn(wtype(message), stacklevel=3)
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return fn(*args, **kwargs)
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doc = func.__doc__ is not None and func.__doc__ or ''
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if docstring_header is not None:
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docstring_header %= dict(func=func.__name__)
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doc = inject_docstring_text(doc, docstring_header, 1)
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decorated = warned(func)
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decorated.__doc__ = doc
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return decorated
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import textwrap
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def _dedent_docstring(text):
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split_text = text.split("\n", 1)
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if len(split_text) == 1:
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return text
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else:
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firstline, remaining = split_text
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if not firstline.startswith(" "):
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return firstline + "\n" + textwrap.dedent(remaining)
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else:
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return textwrap.dedent(text)
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def inject_docstring_text(doctext, injecttext, pos):
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doctext = _dedent_docstring(doctext or "")
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lines = doctext.split('\n')
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injectlines = textwrap.dedent(injecttext).split("\n")
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if injectlines[0]:
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injectlines.insert(0, "")
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blanks = [num for num, line in enumerate(lines) if not line.strip()]
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blanks.insert(0, 0)
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inject_pos = blanks[min(pos, len(blanks) - 1)]
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lines = lines[0:inject_pos] + injectlines + lines[inject_pos:]
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return "\n".join(lines)
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