# Copyright 2019 Ram Rachum and collaborators.
# This program is distributed under the MIT license.
'''Python 2/3 compatibility'''

import abc
import os

if hasattr(abc, 'ABC'):
    ABC = abc.ABC
else:
    class ABC(object):
        """Helper class that provides a standard way to create an ABC using
        inheritance.
        """
        __metaclass__ = abc.ABCMeta
        __slots__ = ()


if hasattr(os, 'PathLike'):
    PathLike = os.PathLike
else:
    class PathLike(ABC):
        """Abstract base class for implementing the file system path protocol."""

        @abc.abstractmethod
        def __fspath__(self):
            """Return the file system path representation of the object."""
            raise NotImplementedError

        @classmethod
        def __subclasshook__(cls, subclass):
            return (
                hasattr(subclass, '__fspath__') or
                # Make a concession for older `pathlib` versions:g
                (hasattr(subclass, 'open') and
                 'path' in subclass.__name__.lower())
            )