+++ /dev/null
-"""Generic (shallow and deep) copying operations.\r
-\r
-Interface summary:\r
-\r
- import copy\r
-\r
- x = copy.copy(y) # make a shallow copy of y\r
- x = copy.deepcopy(y) # make a deep copy of y\r
-\r
-For module specific errors, copy.Error is raised.\r
-\r
-The difference between shallow and deep copying is only relevant for\r
-compound objects (objects that contain other objects, like lists or\r
-class instances).\r
-\r
-- A shallow copy constructs a new compound object and then (to the\r
- extent possible) inserts *the same objects* into it that the\r
- original contains.\r
-\r
-- A deep copy constructs a new compound object and then, recursively,\r
- inserts *copies* into it of the objects found in the original.\r
-\r
-Two problems often exist with deep copy operations that don't exist\r
-with shallow copy operations:\r
-\r
- a) recursive objects (compound objects that, directly or indirectly,\r
- contain a reference to themselves) may cause a recursive loop\r
-\r
- b) because deep copy copies *everything* it may copy too much, e.g.\r
- administrative data structures that should be shared even between\r
- copies\r
-\r
-Python's deep copy operation avoids these problems by:\r
-\r
- a) keeping a table of objects already copied during the current\r
- copying pass\r
-\r
- b) letting user-defined classes override the copying operation or the\r
- set of components copied\r
-\r
-This version does not copy types like module, class, function, method,\r
-nor stack trace, stack frame, nor file, socket, window, nor array, nor\r
-any similar types.\r
-\r
-Classes can use the same interfaces to control copying that they use\r
-to control pickling: they can define methods called __getinitargs__(),\r
-__getstate__() and __setstate__(). See the documentation for module\r
-"pickle" for information on these methods.\r
-"""\r
-\r
-import types\r
-import weakref\r
-from copy_reg import dispatch_table\r
-\r
-class Error(Exception):\r
- pass\r
-error = Error # backward compatibility\r
-\r
-try:\r
- from org.python.core import PyStringMap\r
-except ImportError:\r
- PyStringMap = None\r
-\r
-__all__ = ["Error", "copy", "deepcopy"]\r
-\r
-def copy(x):\r
- """Shallow copy operation on arbitrary Python objects.\r
-\r
- See the module's __doc__ string for more info.\r
- """\r
-\r
- cls = type(x)\r
-\r
- copier = _copy_dispatch.get(cls)\r
- if copier:\r
- return copier(x)\r
-\r
- copier = getattr(cls, "__copy__", None)\r
- if copier:\r
- return copier(x)\r
-\r
- reductor = dispatch_table.get(cls)\r
- if reductor:\r
- rv = reductor(x)\r
- else:\r
- reductor = getattr(x, "__reduce_ex__", None)\r
- if reductor:\r
- rv = reductor(2)\r
- else:\r
- reductor = getattr(x, "__reduce__", None)\r
- if reductor:\r
- rv = reductor()\r
- else:\r
- raise Error("un(shallow)copyable object of type %s" % cls)\r
-\r
- return _reconstruct(x, rv, 0)\r
-\r
-\r
-_copy_dispatch = d = {}\r
-\r
-def _copy_immutable(x):\r
- return x\r
-for t in (type(None), int, long, float, bool, str, tuple,\r
- frozenset, type, xrange, types.ClassType,\r
- types.BuiltinFunctionType, type(Ellipsis),\r
- types.FunctionType, weakref.ref):\r
- d[t] = _copy_immutable\r
-for name in ("ComplexType", "UnicodeType", "CodeType"):\r
- t = getattr(types, name, None)\r
- if t is not None:\r
- d[t] = _copy_immutable\r
-\r
-def _copy_with_constructor(x):\r
- return type(x)(x)\r
-for t in (list, dict, set):\r
- d[t] = _copy_with_constructor\r
-\r
-def _copy_with_copy_method(x):\r
- return x.copy()\r
-if PyStringMap is not None:\r
- d[PyStringMap] = _copy_with_copy_method\r
-\r
-def _copy_inst(x):\r
- if hasattr(x, '__copy__'):\r
- return x.__copy__()\r
- if hasattr(x, '__getinitargs__'):\r
- args = x.__getinitargs__()\r
- y = x.__class__(*args)\r
- else:\r
- y = _EmptyClass()\r
- y.__class__ = x.__class__\r
- if hasattr(x, '__getstate__'):\r
- state = x.__getstate__()\r
- else:\r
- state = x.__dict__\r
- if hasattr(y, '__setstate__'):\r
- y.__setstate__(state)\r
- else:\r
- y.__dict__.update(state)\r
- return y\r
-d[types.InstanceType] = _copy_inst\r
-\r
-del d\r
-\r
-def deepcopy(x, memo=None, _nil=[]):\r
- """Deep copy operation on arbitrary Python objects.\r
-\r
- See the module's __doc__ string for more info.\r
- """\r
-\r
- if memo is None:\r
- memo = {}\r
-\r
- d = id(x)\r
- y = memo.get(d, _nil)\r
- if y is not _nil:\r
- return y\r
-\r
- cls = type(x)\r
-\r
- copier = _deepcopy_dispatch.get(cls)\r
- if copier:\r
- y = copier(x, memo)\r
- else:\r
- try:\r
- issc = issubclass(cls, type)\r
- except TypeError: # cls is not a class (old Boost; see SF #502085)\r
- issc = 0\r
- if issc:\r
- y = _deepcopy_atomic(x, memo)\r
- else:\r
- copier = getattr(x, "__deepcopy__", None)\r
- if copier:\r
- y = copier(memo)\r
- else:\r
- reductor = dispatch_table.get(cls)\r
- if reductor:\r
- rv = reductor(x)\r
- else:\r
- reductor = getattr(x, "__reduce_ex__", None)\r
- if reductor:\r
- rv = reductor(2)\r
- else:\r
- reductor = getattr(x, "__reduce__", None)\r
- if reductor:\r
- rv = reductor()\r
- else:\r
- raise Error(\r
- "un(deep)copyable object of type %s" % cls)\r
- y = _reconstruct(x, rv, 1, memo)\r
-\r
- memo[d] = y\r
- _keep_alive(x, memo) # Make sure x lives at least as long as d\r
- return y\r
-\r
-_deepcopy_dispatch = d = {}\r
-\r
-def _deepcopy_atomic(x, memo):\r
- return x\r
-d[type(None)] = _deepcopy_atomic\r
-d[type(Ellipsis)] = _deepcopy_atomic\r
-d[int] = _deepcopy_atomic\r
-d[long] = _deepcopy_atomic\r
-d[float] = _deepcopy_atomic\r
-d[bool] = _deepcopy_atomic\r
-try:\r
- d[complex] = _deepcopy_atomic\r
-except NameError:\r
- pass\r
-d[str] = _deepcopy_atomic\r
-try:\r
- d[unicode] = _deepcopy_atomic\r
-except NameError:\r
- pass\r
-try:\r
- d[types.CodeType] = _deepcopy_atomic\r
-except AttributeError:\r
- pass\r
-d[type] = _deepcopy_atomic\r
-d[xrange] = _deepcopy_atomic\r
-d[types.ClassType] = _deepcopy_atomic\r
-d[types.BuiltinFunctionType] = _deepcopy_atomic\r
-d[types.FunctionType] = _deepcopy_atomic\r
-d[weakref.ref] = _deepcopy_atomic\r
-\r
-def _deepcopy_list(x, memo):\r
- y = []\r
- memo[id(x)] = y\r
- for a in x:\r
- y.append(deepcopy(a, memo))\r
- return y\r
-d[list] = _deepcopy_list\r
-\r
-def _deepcopy_tuple(x, memo):\r
- y = []\r
- for a in x:\r
- y.append(deepcopy(a, memo))\r
- d = id(x)\r
- try:\r
- return memo[d]\r
- except KeyError:\r
- pass\r
- for i in range(len(x)):\r
- if x[i] is not y[i]:\r
- y = tuple(y)\r
- break\r
- else:\r
- y = x\r
- memo[d] = y\r
- return y\r
-d[tuple] = _deepcopy_tuple\r
-\r
-def _deepcopy_dict(x, memo):\r
- y = {}\r
- memo[id(x)] = y\r
- for key, value in x.iteritems():\r
- y[deepcopy(key, memo)] = deepcopy(value, memo)\r
- return y\r
-d[dict] = _deepcopy_dict\r
-if PyStringMap is not None:\r
- d[PyStringMap] = _deepcopy_dict\r
-\r
-def _deepcopy_method(x, memo): # Copy instance methods\r
- return type(x)(x.im_func, deepcopy(x.im_self, memo), x.im_class)\r
-_deepcopy_dispatch[types.MethodType] = _deepcopy_method\r
-\r
-def _keep_alive(x, memo):\r
- """Keeps a reference to the object x in the memo.\r
-\r
- Because we remember objects by their id, we have\r
- to assure that possibly temporary objects are kept\r
- alive by referencing them.\r
- We store a reference at the id of the memo, which should\r
- normally not be used unless someone tries to deepcopy\r
- the memo itself...\r
- """\r
- try:\r
- memo[id(memo)].append(x)\r
- except KeyError:\r
- # aha, this is the first one :-)\r
- memo[id(memo)]=[x]\r
-\r
-def _deepcopy_inst(x, memo):\r
- if hasattr(x, '__deepcopy__'):\r
- return x.__deepcopy__(memo)\r
- if hasattr(x, '__getinitargs__'):\r
- args = x.__getinitargs__()\r
- args = deepcopy(args, memo)\r
- y = x.__class__(*args)\r
- else:\r
- y = _EmptyClass()\r
- y.__class__ = x.__class__\r
- memo[id(x)] = y\r
- if hasattr(x, '__getstate__'):\r
- state = x.__getstate__()\r
- else:\r
- state = x.__dict__\r
- state = deepcopy(state, memo)\r
- if hasattr(y, '__setstate__'):\r
- y.__setstate__(state)\r
- else:\r
- y.__dict__.update(state)\r
- return y\r
-d[types.InstanceType] = _deepcopy_inst\r
-\r
-def _reconstruct(x, info, deep, memo=None):\r
- if isinstance(info, str):\r
- return x\r
- assert isinstance(info, tuple)\r
- if memo is None:\r
- memo = {}\r
- n = len(info)\r
- assert n in (2, 3, 4, 5)\r
- callable, args = info[:2]\r
- if n > 2:\r
- state = info[2]\r
- else:\r
- state = {}\r
- if n > 3:\r
- listiter = info[3]\r
- else:\r
- listiter = None\r
- if n > 4:\r
- dictiter = info[4]\r
- else:\r
- dictiter = None\r
- if deep:\r
- args = deepcopy(args, memo)\r
- y = callable(*args)\r
- memo[id(x)] = y\r
-\r
- if state:\r
- if deep:\r
- state = deepcopy(state, memo)\r
- if hasattr(y, '__setstate__'):\r
- y.__setstate__(state)\r
- else:\r
- if isinstance(state, tuple) and len(state) == 2:\r
- state, slotstate = state\r
- else:\r
- slotstate = None\r
- if state is not None:\r
- y.__dict__.update(state)\r
- if slotstate is not None:\r
- for key, value in slotstate.iteritems():\r
- setattr(y, key, value)\r
-\r
- if listiter is not None:\r
- for item in listiter:\r
- if deep:\r
- item = deepcopy(item, memo)\r
- y.append(item)\r
- if dictiter is not None:\r
- for key, value in dictiter:\r
- if deep:\r
- key = deepcopy(key, memo)\r
- value = deepcopy(value, memo)\r
- y[key] = value\r
- return y\r
-\r
-del d\r
-\r
-del types\r
-\r
-# Helper for instance creation without calling __init__\r
-class _EmptyClass:\r
- pass\r
-\r
-def _test():\r
- l = [None, 1, 2L, 3.14, 'xyzzy', (1, 2L), [3.14, 'abc'],\r
- {'abc': 'ABC'}, (), [], {}]\r
- l1 = copy(l)\r
- print l1==l\r
- l1 = map(copy, l)\r
- print l1==l\r
- l1 = deepcopy(l)\r
- print l1==l\r
- class C:\r
- def __init__(self, arg=None):\r
- self.a = 1\r
- self.arg = arg\r
- if __name__ == '__main__':\r
- import sys\r
- file = sys.argv[0]\r
- else:\r
- file = __file__\r
- self.fp = open(file)\r
- self.fp.close()\r
- def __getstate__(self):\r
- return {'a': self.a, 'arg': self.arg}\r
- def __setstate__(self, state):\r
- for key, value in state.iteritems():\r
- setattr(self, key, value)\r
- def __deepcopy__(self, memo=None):\r
- new = self.__class__(deepcopy(self.arg, memo))\r
- new.a = self.a\r
- return new\r
- c = C('argument sketch')\r
- l.append(c)\r
- l2 = copy(l)\r
- print l == l2\r
- print l\r
- print l2\r
- l2 = deepcopy(l)\r
- print l == l2\r
- print l\r
- print l2\r
- l.append({l[1]: l, 'xyz': l[2]})\r
- l3 = copy(l)\r
- import repr\r
- print map(repr.repr, l)\r
- print map(repr.repr, l1)\r
- print map(repr.repr, l2)\r
- print map(repr.repr, l3)\r
- l3 = deepcopy(l)\r
- import repr\r
- print map(repr.repr, l)\r
- print map(repr.repr, l1)\r
- print map(repr.repr, l2)\r
- print map(repr.repr, l3)\r
- class odict(dict):\r
- def __init__(self, d = {}):\r
- self.a = 99\r
- dict.__init__(self, d)\r
- def __setitem__(self, k, i):\r
- dict.__setitem__(self, k, i)\r
- self.a\r
- o = odict({"A" : "B"})\r
- x = deepcopy(o)\r
- print(o, x)\r
-\r
-if __name__ == '__main__':\r
- _test()\r
projects / mirror_edk2.git / blobdiff