# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: copy.py
"""Generic (shallow and deep) copying operations.

Interface summary:

        import copy

        x = copy.copy(y)        # make a shallow copy of y
        x = copy.deepcopy(y)    # make a deep copy of y

For module specific errors, copy.Error is raised.

The difference between shallow and deep copying is only relevant for
compound objects (objects that contain other objects, like lists or
class instances).

- A shallow copy constructs a new compound object and then (to the
  extent possible) inserts *the same objects* into it that the
  original contains.

- A deep copy constructs a new compound object and then, recursively,
  inserts *copies* into it of the objects found in the original.

Two problems often exist with deep copy operations that don't exist
with shallow copy operations:

 a) recursive objects (compound objects that, directly or indirectly,
    contain a reference to themselves) may cause a recursive loop

 b) because deep copy copies *everything* it may copy too much, e.g.
    administrative data structures that should be shared even between
    copies

Python's deep copy operation avoids these problems by:

 a) keeping a table of objects already copied during the current
    copying pass

 b) letting user-defined classes override the copying operation or the
    set of components copied

This version does not copy types like module, class, function, method,
nor stack trace, stack frame, nor file, socket, window, nor array, nor
any similar types.

Classes can use the same interfaces to control copying that they use
to control pickling: they can define methods called __getinitargs__(),
__getstate__() and __setstate__().  See the documentation for module
"pickle" for information on these methods.
"""
import types, weakref
from copyreg import dispatch_table


class Error(Exception):
    pass


error = Error
try:
    from org.python.core import PyStringMap
except ImportError:
    PyStringMap = None

__all__ = ["Error", "copy", "deepcopy"]


def copy(x):
    """Shallow copy operation on arbitrary Python objects.
    
    See the module's __doc__ string for more info.
    """
    cls = type(x)
    copier = _copy_dispatch.get(cls)
    if copier:
        return copier(x)
        try:
            issc = issubclass(cls, type)
        except TypeError:
            issc = False

        if issc:
            return _copy_immutable(x)
        copier = getattr(cls, "__copy__", None)
        if copier:
            return copier(x)
        reductor = dispatch_table.get(cls)
    if reductor:
        rv = reductor(x)
    else:
        reductor = getattr(x, "__reduce_ex__", None)
        if reductor:
            rv = reductor(4)
        else:
            reductor = getattr(x, "__reduce__", None)
            if reductor:
                rv = reductor()
            else:
                raise Error("un(shallow)copyable object of type %s" % cls)
            if isinstance(rv, str):
                return x
            return _reconstruct(x, None, *rv)


_copy_dispatch = d = {}


def _copy_immutable(x):
    return x


for t in (
    type(None),
    int,
    float,
    bool,
    complex,
    str,
    tuple,
    bytes,
    frozenset,
    type,
    range,
    slice,
    types.BuiltinFunctionType,
    type(Ellipsis),
    type(NotImplemented),
    types.FunctionType,
    weakref.ref,
):
    d[t] = _copy_immutable

t = getattr(types, "CodeType", None)
if t is not None:
    d[t] = _copy_immutable
d[list] = list.copy
d[dict] = dict.copy
d[set] = set.copy
d[bytearray] = bytearray.copy
if PyStringMap is not None:
    d[PyStringMap] = PyStringMap.copy
del d
del t


def deepcopy(x, memo=None, _nil=[]):
    """Deep copy operation on arbitrary Python objects.
    
    See the module's __doc__ string for more info.
    """
    if memo is None:
        memo = {}
    d = id(x)
    y = memo.get(d, _nil)
    if y is not _nil:
        return y
    cls = type(x)
    copier = _deepcopy_dispatch.get(cls)
    if copier:
        y = copier(x, memo)
    else:
        try:
            issc = issubclass(cls, type)
        except TypeError:
            issc = 0

        if issc:
            y = _deepcopy_atomic(x, memo)
        else:
            copier = getattr(x, "__deepcopy__", None)
            if copier:
                y = copier(memo)
            else:
                reductor = dispatch_table.get(cls)
                if reductor:
                    rv = reductor(x)
                else:
                    reductor = getattr(x, "__reduce_ex__", None)
                    if reductor:
                        rv = reductor(4)
                    else:
                        reductor = getattr(x, "__reduce__", None)
                        if reductor:
                            rv = reductor()
                        else:
                            raise Error("un(deep)copyable object of type %s" % cls)
                        if isinstance(rv, str):
                            y = x
                        else:
                            y = _reconstruct(x, memo, *rv)
                        if y is not x:
                            memo[d] = y
                            _keep_alive(x, memo)
                        return y


_deepcopy_dispatch = d = {}


def _deepcopy_atomic(x, memo):
    return x


d[type(None)] = _deepcopy_atomic
d[type(Ellipsis)] = _deepcopy_atomic
d[type(NotImplemented)] = _deepcopy_atomic
d[int] = _deepcopy_atomic
d[float] = _deepcopy_atomic
d[bool] = _deepcopy_atomic
d[complex] = _deepcopy_atomic
d[bytes] = _deepcopy_atomic
d[str] = _deepcopy_atomic
try:
    d[types.CodeType] = _deepcopy_atomic
except AttributeError:
    pass

d[type] = _deepcopy_atomic
d[types.BuiltinFunctionType] = _deepcopy_atomic
d[types.FunctionType] = _deepcopy_atomic
d[weakref.ref] = _deepcopy_atomic


def _deepcopy_list(x, memo, deepcopy=deepcopy):
    y = []
    memo[id(x)] = y
    append = y.append
    for a in x:
        append(deepcopy(a, memo))

    return y


d[list] = _deepcopy_list


def _deepcopy_tuple(x, memo, deepcopy=deepcopy):
    y = [deepcopy(a, memo) for a in x]
    try:
        return memo[id(x)]
    except KeyError:
        pass

    for k, j in zip(x, y):
        if k is not j:
            y = tuple(y)
            break
    else:
        y = x

    return y


d[tuple] = _deepcopy_tuple


def _deepcopy_dict(x, memo, deepcopy=deepcopy):
    y = {}
    memo[id(x)] = y
    for key, value in x.items():
        y[deepcopy(key, memo)] = deepcopy(value, memo)

    return y


d[dict] = _deepcopy_dict
if PyStringMap is not None:
    d[PyStringMap] = _deepcopy_dict


def _deepcopy_method(x, memo):
    return type(x)(x.__func__, deepcopy(x.__self__, memo))


d[types.MethodType] = _deepcopy_method
del d


def _keep_alive(x, memo):
    """Keeps a reference to the object x in the memo.
    
    Because we remember objects by their id, we have
    to assure that possibly temporary objects are kept
    alive by referencing them.
    We store a reference at the id of the memo, which should
    normally not be used unless someone tries to deepcopy
    the memo itself...
    """
    try:
        memo[id(memo)].append(x)
    except KeyError:
        memo[id(memo)] = [x]


def _reconstruct(
    x, memo, func, args, state=None, listiter=None, dictiter=None, deepcopy=deepcopy
):
    deep = memo is not None
    if deep:
        if args:
            args = (deepcopy(arg, memo) for arg in args)
    y = func(*args)
    if deep:
        memo[id(x)] = y
    if state is not None:
        if deep:
            state = deepcopy(state, memo)
        if hasattr(y, "__setstate__"):
            y.__setstate__(state)
        else:
            if isinstance(state, tuple):
                if len(state) == 2:
                    state, slotstate = state
                slotstate = None
            if state is not None:
                y.__dict__.update(state)
            if slotstate is not None:
                for key, value in slotstate.items():
                    setattr(y, key, value)

        if listiter is not None:
            if deep:
                for item in listiter:
                    item = deepcopy(item, memo)
                    y.append(item)

            else:
                for item in listiter:
                    y.append(item)

            if dictiter is not None:
                if deep:
                    for key, value in dictiter:
                        key = deepcopy(key, memo)
                        value = deepcopy(value, memo)
                        y[key] = value

                else:
                    for key, value in dictiter:
                        y[key] = value

                return y


del types
del weakref
del PyStringMap