# Copyright 2016-present Facebook, Inc.

# All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions are met:

#

#  * Redistributions of source code must retain the above copyright notice,

#    this list of conditions and the following disclaimer.

#

#  * Redistributions in binary form must reproduce the above copyright notice,

#    this list of conditions and the following disclaimer in the documentation

#    and/or other materials provided with the distribution.

#

#  * Neither the name Facebook nor the names of its contributors may be used to

#    endorse or promote products derived from this software without specific

#    prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE

# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# no unicode literals

import sys

PYTHON3 = sys.version_info >= (3, 0)

# This is adapted from https://bitbucket.org/gutworth/six, and used under the

# MIT license. See LICENSE for a full copyright notice.

if PYTHON3:

    def reraise(tp, value, tb=None):

        try:

            if value is None:

                value = tp()

            if value.__traceback__ is not tb:

                raise value.with_traceback(tb)

            raise value

        finally:

            value = None

            tb = None

else:

def reraise(tp, value, tb=None):

    try:

        raise tp, value, tb

    finally:

        tb = None

if PYTHON3:

    UNICODE = str

else: