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from typing import Any, Dict
import textwrap

_BACK_COMPAT_OBJECTS : Dict[Any, None] = {}
_MARKED_WITH_COMPATIBILITY : Dict[Any, None] = {}

def compatibility(is_backward_compatible : bool):
    if is_backward_compatible:

        def mark_back_compat(fn):
            docstring = textwrap.dedent(getattr(fn, '__doc__', None) or '')
            docstring += """

.. note::

    Backwards-compatibility for this API is guaranteed.

"""
            fn.__doc__ = docstring
            _BACK_COMPAT_OBJECTS.setdefault(fn)
            _MARKED_WITH_COMPATIBILITY.setdefault(fn)
            return fn

        return mark_back_compat
    else:

        def mark_not_back_compat(fn):
            docstring = textwrap.dedent(getattr(fn, '__doc__', None) or '')
            docstring += """

.. warning::

    This API is experimental and is *NOT* backward-compatible.

"""
            fn.__doc__ = docstring
            _MARKED_WITH_COMPATIBILITY.setdefault(fn)
            return fn

        return mark_not_back_compat