mercurial/thirdparty/zope/interface/_compat.py

thirdparty: port zope.interface to relative imports

By using relative imports, we're guaranteed to get modules
vendored with Mercurial rather than other random modules
that might be in sys.path.

My editor strips trailing whitespace on save. So some minor
source code cleanup was also performed as part of this commit.

# no-check-commit because some modified lines have double newlines

Differential Revision: https://phab.mercurial-scm.org/D2930

##############################################################################
#
# Copyright (c) 2006 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Basic components support
"""
from __future__ import absolute_import

import sys
import types

if sys.version_info[0] < 3:

    def _normalize_name(name):
        if isinstance(name, basestring):
            return unicode(name)
        raise TypeError("name must be a regular or unicode string")

    CLASS_TYPES = (type, types.ClassType)
    STRING_TYPES = (basestring,)

    _BUILTINS = '__builtin__'

    PYTHON3 = False
    PYTHON2 = True

else:

    def _normalize_name(name):
        if isinstance(name, bytes):
            name = str(name, 'ascii')
        if isinstance(name, str):
            return name
        raise TypeError("name must be a string or ASCII-only bytes")

    CLASS_TYPES = (type,)
    STRING_TYPES = (str,)

    _BUILTINS = 'builtins'

    PYTHON3 = True
    PYTHON2 = False

def _skip_under_py3k(test_method):
    import unittest
    return unittest.skipIf(sys.version_info[0] >= 3, "Only on Python 2")(test_method)


def _skip_under_py2(test_method):
    import unittest
    return unittest.skipIf(sys.version_info[0] < 3, "Only on Python 3")(test_method)