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# Copyright (C) 2010 Google 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 of Google Inc. 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
# OWNER 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.
"""generic routines to convert platform-specific paths to URIs."""
from __future__ import with_statement
import atexit
import subprocess
import sys
import threading
import urllib
def abspath_to_uri(path, platform=None):
"""Converts a platform-specific absolute path to a file: URL."""
if platform is None:
platform = sys.platform
return "file:" + _escape(_convert_path(path, platform))
def cygpath(path):
"""Converts an absolute cygwin path to an absolute Windows path."""
return _CygPath.convert_using_singleton(path)
# Note that this object is not threadsafe and must only be called
# from multiple threads under protection of a lock (as is done in cygpath())
class _CygPath(object):
"""Manages a long-running 'cygpath' process for file conversion."""
_lock = None
_singleton = None
@staticmethod
def stop_cygpath_subprocess():
if not _CygPath._lock:
return
with _CygPath._lock:
if _CygPath._singleton:
_CygPath._singleton.stop()
@staticmethod
def convert_using_singleton(path):
if not _CygPath._lock:
_CygPath._lock = threading.Lock()
with _CygPath._lock:
if not _CygPath._singleton:
_CygPath._singleton = _CygPath()
# Make sure the cygpath subprocess always gets shutdown cleanly.
atexit.register(_CygPath.stop_cygpath_subprocess)
return _CygPath._singleton.convert(path)
def __init__(self):
self._child_process = None
def start(self):
assert(self._child_process is None)
args = ['cygpath', '-f', '-', '-wa']
self._child_process = subprocess.Popen(args,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
def is_running(self):
if not self._child_process:
return False
return self._child_process.returncode is None
def stop(self):
if self._child_process:
self._child_process.stdin.close()
self._child_process.wait()
self._child_process = None
def convert(self, path):
if not self.is_running():
self.start()
self._child_process.stdin.write("%s\r\n" % path)
self._child_process.stdin.flush()
windows_path = self._child_process.stdout.readline().rstrip()
# Some versions of cygpath use lowercase drive letters while others
# use uppercase. We always convert to uppercase for consistency.
windows_path = '%s%s' % (windows_path[0].upper(), windows_path[1:])
return windows_path
def _escape(path):
"""Handle any characters in the path that should be escaped."""
# FIXME: web browsers don't appear to blindly quote every character
# when converting filenames to files. Instead of using urllib's default
# rules, we allow a small list of other characters through un-escaped.
# It's unclear if this is the best possible solution.
return urllib.quote(path, safe='/+:')
def _convert_path(path, platform):
"""Handles any os-specific path separators, mappings, etc."""
if platform == 'win32':
return _winpath_to_uri(path)
if platform == 'cygwin':
return _winpath_to_uri(cygpath(path))
return _unixypath_to_uri(path)
def _winpath_to_uri(path):
"""Converts a window absolute path to a file: URL."""
return "///" + path.replace("\\", "/")
def _unixypath_to_uri(path):
"""Converts a unix-style path to a file: URL."""
return "//" + path
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