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-# Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
-#
-# Redistribution and use in source and binary forms, with or without
-# modification, are permitted provided that the following conditions
-# are met:
-# 1. Redistributions of source code must retain the above copyright
-# notice, this list of conditions and the following disclaimer.
-# 2. 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.
-#
-# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
-
-"""Contains a substitute for Python 2.6's os.path.relpath()."""
-
-import os
-
-
-# This function is a replacement for os.path.relpath(), which is only
-# available in Python 2.6:
-#
-# http://docs.python.org/library/os.path.html#os.path.relpath
-#
-# It should behave essentially the same as os.path.relpath(), except for
-# returning None on paths not contained in abs_start_path.
-def relpath(path, start_path, os_path_abspath=None, sep=None):
- """Return a path relative to the given start path, or None.
-
- Returns None if the path is not contained in the directory start_path.
-
- Args:
- path: An absolute or relative path to convert to a relative path.
- start_path: The path relative to which the given path should be
- converted.
- os_path_abspath: A replacement function for unit testing. This
- function should strip trailing slashes just like
- os.path.abspath(). Defaults to os.path.abspath.
- sep: Path separator. Defaults to os.path.sep
-
- """
- if os_path_abspath is None:
- os_path_abspath = os.path.abspath
- sep = sep or os.sep
-
- # Since os_path_abspath() calls os.path.normpath()--
- #
- # (see http://docs.python.org/library/os.path.html#os.path.abspath )
- #
- # it also removes trailing slashes and converts forward and backward
- # slashes to the preferred slash os.sep.
- start_path = os_path_abspath(start_path)
- path = os_path_abspath(path)
-
- if not path.lower().startswith(start_path.lower()):
- # Then path is outside the directory given by start_path.
- return None
-
- rel_path = path[len(start_path):]
-
- if not rel_path:
- # Then the paths are the same.
- pass
- elif rel_path[0] == sep:
- # It is probably sufficient to remove just the first character
- # since os.path.normpath() collapses separators, but we use
- # lstrip() just to be sure.
- rel_path = rel_path.lstrip(sep)
- else:
- # We are in the case typified by the following example:
- #
- # start_path = "/tmp/foo"
- # path = "/tmp/foobar"
- # rel_path = "bar"
- return None
-
- return rel_path