95 lines
2.8 KiB
Python
95 lines
2.8 KiB
Python
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"""A shim module for deprecated imports
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"""
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# Copyright (c) yap_ipython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import sys
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import types
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from importlib import import_module
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from .importstring import import_item
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class ShimWarning(Warning):
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"""A warning to show when a module has moved, and a shim is in its place."""
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class ShimImporter(object):
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"""Import hook for a shim.
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This ensures that submodule imports return the real target module,
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not a clone that will confuse `is` and `isinstance` checks.
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"""
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def __init__(self, src, mirror):
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self.src = src
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self.mirror = mirror
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def _mirror_name(self, fullname):
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"""get the name of the mirrored module"""
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return self.mirror + fullname[len(self.src):]
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def find_module(self, fullname, path=None):
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"""Return self if we should be used to import the module."""
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if fullname.startswith(self.src + '.'):
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mirror_name = self._mirror_name(fullname)
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try:
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mod = import_item(mirror_name)
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except ImportError:
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return
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else:
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if not isinstance(mod, types.ModuleType):
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# not a module
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return None
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return self
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def load_module(self, fullname):
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"""Import the mirrored module, and insert it into sys.modules"""
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mirror_name = self._mirror_name(fullname)
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mod = import_item(mirror_name)
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sys.modules[fullname] = mod
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return mod
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class ShimModule(types.ModuleType):
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def __init__(self, *args, **kwargs):
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self._mirror = kwargs.pop("mirror")
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src = kwargs.pop("src", None)
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if src:
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kwargs['name'] = src.rsplit('.', 1)[-1]
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super(ShimModule, self).__init__(*args, **kwargs)
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# add import hook for descendent modules
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if src:
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sys.meta_path.append(
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ShimImporter(src=src, mirror=self._mirror)
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)
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@property
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def __path__(self):
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return []
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@property
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def __spec__(self):
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"""Don't produce __spec__ until requested"""
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return import_module(self._mirror).__spec__
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def __dir__(self):
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return dir(import_module(self._mirror))
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@property
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def __all__(self):
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"""Ensure __all__ is always defined"""
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mod = import_module(self._mirror)
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try:
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return mod.__all__
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except AttributeError:
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return [name for name in dir(mod) if not name.startswith('_')]
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def __getattr__(self, key):
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# Use the equivalent of import_item(name), see below
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name = "%s.%s" % (self._mirror, key)
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try:
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return import_item(name)
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except ImportError:
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raise AttributeError(key)
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