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cdc6c5208e
Also strip UnsafeProxy off of low level srings and objects to ensure they don't cause issues later down the road Fixes #12513
175 lines
7.1 KiB
Python
175 lines
7.1 KiB
Python
# PYTHON SOFTWARE FOUNDATION LICENSE VERSION 2
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# --------------------------------------------
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#
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# 1. This LICENSE AGREEMENT is between the Python Software Foundation
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# ("PSF"), and the Individual or Organization ("Licensee") accessing and
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# otherwise using this software ("Python") in source or binary form and
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# its associated documentation.
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#
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# 2. Subject to the terms and conditions of this License Agreement, PSF hereby
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# grants Licensee a nonexclusive, royalty-free, world-wide license to reproduce,
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# analyze, test, perform and/or display publicly, prepare derivative works,
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# distribute, and otherwise use Python alone or in any derivative version,
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# provided, however, that PSF's License Agreement and PSF's notice of copyright,
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# i.e., "Copyright (c) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
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# 2011, 2012, 2013, 2014 Python Software Foundation; All Rights Reserved" are
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# retained in Python alone or in any derivative version prepared by Licensee.
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#
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# 3. In the event Licensee prepares a derivative work that is based on
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# or incorporates Python or any part thereof, and wants to make
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# the derivative work available to others as provided herein, then
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# Licensee hereby agrees to include in any such work a brief summary of
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# the changes made to Python.
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#
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# 4. PSF is making Python available to Licensee on an "AS IS"
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# basis. PSF MAKES NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR
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# IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION, PSF MAKES NO AND
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# DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
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# FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF PYTHON WILL NOT
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# INFRINGE ANY THIRD PARTY RIGHTS.
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#
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# 5. PSF SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF PYTHON
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# FOR ANY INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS
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# A RESULT OF MODIFYING, DISTRIBUTING, OR OTHERWISE USING PYTHON,
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# OR ANY DERIVATIVE THEREOF, EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
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#
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# 6. This License Agreement will automatically terminate upon a material
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# breach of its terms and conditions.
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#
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# 7. Nothing in this License Agreement shall be deemed to create any
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# relationship of agency, partnership, or joint venture between PSF and
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# Licensee. This License Agreement does not grant permission to use PSF
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# trademarks or trade name in a trademark sense to endorse or promote
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# products or services of Licensee, or any third party.
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#
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# 8. By copying, installing or otherwise using Python, Licensee
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# agrees to be bound by the terms and conditions of this License
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# Agreement.
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#
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# Original Python Recipe for Proxy:
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# http://code.activestate.com/recipes/496741-object-proxying/
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# Author: Tomer Filiba
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__all__ = ['UnsafeProxy', 'wrap_var']
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class UnsafeProxy(object):
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__slots__ = ["_obj", "__weakref__"]
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def __init__(self, obj):
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object.__setattr__(self, "_obj", obj)
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#
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# proxying (special cases)
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#
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def __getattribute__(self, name):
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if name == '_obj':
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return object.__getattribute__(self, "_obj")
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elif name == '__reduce_ex__':
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return object.__getattribute__(self, "__reduce_ex__")
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elif name == '__UNSAFE__':
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return True
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else:
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return getattr(object.__getattribute__(self, "_obj"), name)
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def __eq__(self, obj):
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'''
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special handling for == due to the fact that int objects do
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not define it, so trying to guess whether we should or should
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not override object.__eq__ with the wrapped classes version
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causes problems
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'''
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return object.__getattribute__(self, "_obj") == obj
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def __delattr__(self, name):
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delattr(object.__getattribute__(self, "_obj"), name)
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def __setattr__(self, name, value):
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setattr(object.__getattribute__(self, "_obj"), name, value)
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def __nonzero__(self):
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return bool(object.__getattribute__(self, "_obj"))
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def __str__(self):
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#import epdb; epdb.st()
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return str(object.__getattribute__(self, "_obj"))
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def __unicode__(self):
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#import epdb; epdb.st()
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return unicode(object.__getattribute__(self, "_obj"))
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def __repr__(self):
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return repr(object.__getattribute__(self, "_obj"))
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def __reduce_ex__(self, protocol):
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return (UnsafeProxy, (self._obj,))
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#
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# factories
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#
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_special_names = [
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'__abs__', '__add__', '__and__', '__call__', '__cmp__', '__coerce__',
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'__contains__', '__delitem__', '__delslice__', '__div__', '__divmod__',
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'__eq__', '__float__', '__floordiv__', '__ge__', '__getitem__',
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'__getslice__', '__gt__', '__hash__', '__hex__', '__iadd__', '__iand__',
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'__idiv__', '__idivmod__', '__ifloordiv__', '__ilshift__', '__imod__',
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'__imul__', '__int__', '__invert__', '__ior__', '__ipow__', '__irshift__',
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'__isub__', '__iter__', '__itruediv__', '__ixor__', '__le__', '__len__',
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'__long__', '__lshift__', '__lt__', '__mod__', '__mul__', '__ne__',
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'__neg__', '__oct__', '__or__', '__pos__', '__pow__', '__radd__', '__rand__',
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'__rdiv__', '__rdivmod__', '__repr__', '__reversed__', '__rfloordiv__',
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'__rlshift__', '__rmod__', '__rmul__', '__ror__', '__rpow__', '__rrshift__',
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'__rshift__', '__rsub__', '__rtruediv__', '__rxor__', '__setitem__',
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'__setslice__', '__sub__', '__truediv__', '__xor__', 'next',
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]
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@classmethod
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def _create_class_proxy(cls, theclass):
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"""creates a proxy for the given class"""
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def make_method(name):
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def method(self, *args, **kw):
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return getattr(object.__getattribute__(self, "_obj"), name)(*args, **kw)
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return method
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namespace = {}
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for name in cls._special_names:
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if hasattr(theclass, name) and not hasattr(cls, name):
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namespace[name] = make_method(name)
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return type("%s(%s)" % (cls.__name__, theclass.__name__), (cls,), namespace)
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def __new__(cls, obj, *args, **kwargs):
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"""
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creates an proxy instance referencing `obj`. (obj, *args, **kwargs) are
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passed to this class' __init__, so deriving classes can define an
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__init__ method of their own.
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note: _class_proxy_cache is unique per deriving class (each deriving
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class must hold its own cache)
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"""
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try:
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cache = cls.__dict__["_class_proxy_cache"]
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except KeyError:
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cls._class_proxy_cache = cache = {}
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try:
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theclass = cache[obj.__class__]
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except KeyError:
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cache[obj.__class__] = theclass = cls._create_class_proxy(obj.__class__)
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ins = object.__new__(theclass)
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return ins
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def _wrap_dict(v):
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for k in v.keys():
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if v[k] is not None and not isinstance(v[k], UnsafeProxy):
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v[k] = _wrap_var(v[k])
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return v
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def _wrap_list(v):
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for idx, item in enumerate(v):
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if item is not None and not isinstance(item, UnsafeProxy):
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v[idx] = _wrap_var(item)
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return v
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def wrap_var(v):
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if isinstance(v, dict):
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v = _wrap_dict(v)
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elif isinstance(v, list):
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v = _wrap_list(v)
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else:
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if v is not None and not isinstance(v, UnsafeProxy):
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v = UnsafeProxy(v)
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return v
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