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Ian Cordasco
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""" | ||
Copyright (c) Donald Stufft, pip, and individual contributors | ||
Permission is hereby granted, free of charge, to any person obtaining | ||
a copy of this software and associated documentation files (the | ||
"Software"), to deal in the Software without restriction, including | ||
without limitation the rights to use, copy, modify, merge, publish, | ||
distribute, sublicense, and/or sell copies of the Software, and to | ||
permit persons to whom the Software is furnished to do so, subject to | ||
the following conditions: | ||
The above copyright notice and this permission notice shall be | ||
included in all copies or substantial portions of the Software. | ||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE | ||
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION | ||
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION | ||
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
""" | ||
from __future__ import absolute_import | ||
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import sys | ||
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class VendorAlias(object): | ||
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def __init__(self, package_names): | ||
self._package_names = package_names | ||
self._vendor_name = __name__ | ||
self._vendor_pkg = self._vendor_name + "." | ||
self._vendor_pkgs = [ | ||
self._vendor_pkg + name for name in self._package_names | ||
] | ||
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def find_module(self, fullname, path=None): | ||
if fullname.startswith(self._vendor_pkg): | ||
return self | ||
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def load_module(self, name): | ||
# Ensure that this only works for the vendored name | ||
if not name.startswith(self._vendor_pkg): | ||
raise ImportError( | ||
"Cannot import %s, must be a subpackage of '%s'." % ( | ||
name, self._vendor_name, | ||
) | ||
) | ||
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if not (name == self._vendor_name or | ||
any(name.startswith(pkg) for pkg in self._vendor_pkgs)): | ||
raise ImportError( | ||
"Cannot import %s, must be one of %s." % ( | ||
name, self._vendor_pkgs | ||
) | ||
) | ||
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# Check to see if we already have this item in sys.modules, if we do | ||
# then simply return that. | ||
if name in sys.modules: | ||
return sys.modules[name] | ||
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# Check to see if we can import the vendor name | ||
try: | ||
# We do this dance here because we want to try and import this | ||
# module without hitting a recursion error because of a bunch of | ||
# VendorAlias instances on sys.meta_path | ||
real_meta_path = sys.meta_path[:] | ||
try: | ||
sys.meta_path = [ | ||
m for m in sys.meta_path | ||
if not isinstance(m, VendorAlias) | ||
] | ||
__import__(name) | ||
module = sys.modules[name] | ||
finally: | ||
# Re-add any additions to sys.meta_path that were made while | ||
# during the import we just did, otherwise things like | ||
# requests.packages.urllib3.poolmanager will fail. | ||
for m in sys.meta_path: | ||
if m not in real_meta_path: | ||
real_meta_path.append(m) | ||
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# Restore sys.meta_path with any new items. | ||
sys.meta_path = real_meta_path | ||
except ImportError: | ||
# We can't import the vendor name, so we'll try to import the | ||
# "real" name. | ||
real_name = name[len(self._vendor_pkg):] | ||
try: | ||
__import__(real_name) | ||
module = sys.modules[real_name] | ||
except ImportError: | ||
raise ImportError("No module named '%s'" % (name,)) | ||
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# If we've gotten here we've found the module we're looking for, either | ||
# as part of our vendored package, or as the real name, so we'll add | ||
# it to sys.modules as the vendored name so that we don't have to do | ||
# the lookup again. | ||
sys.modules[name] = module | ||
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# Finally, return the loaded module | ||
return module | ||
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sys.meta_path.insert(0, VendorAlias(["urllib3", "chardet"])) | ||
from . import urllib3 |