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from rpython.tool.uid import uid
from pypy.interpreter.baseobjspace import W_Root
from pypy.interpreter.error import oefmt
from pypy.interpreter.mixedmodule import MixedModule
class Cell(W_Root):
"A simple container for a wrapped value."
def __init__(self, w_value=None):
self.w_value = w_value
def clone(self):
return self.__class__(self.w_value)
def empty(self):
return self.w_value is None
def get(self):
if self.w_value is None:
raise ValueError("get() from an empty cell")
return self.w_value
def set(self, w_value):
self.w_value = w_value
def delete(self):
if self.w_value is None:
raise ValueError("delete() on an empty cell")
self.w_value = None
def descr__lt__(self, space, w_other):
if not isinstance(w_other, Cell):
return space.w_NotImplemented
if self.w_value is None:
# an empty cell is alway less than a non-empty one
if w_other.w_value is None:
return space.w_False
return space.w_True
elif w_other.w_value is None:
return space.w_False
return space.lt(self.w_value, w_other.w_value)
def descr__eq__(self, space, w_other):
if not isinstance(w_other, Cell):
return space.w_NotImplemented
if self.w_value is None or w_other.w_value is None:
return space.newbool(self.w_value == w_other.w_value)
return space.eq(self.w_value, w_other.w_value)
def descr__reduce__(self, space):
w_mod = space.getbuiltinmodule('_pickle_support')
mod = space.interp_w(MixedModule, w_mod)
new_inst = mod.get('cell_new')
if self.w_value is None: # when would this happen?
return space.newtuple([new_inst, space.newtuple([])])
tup = [self.w_value]
return space.newtuple([new_inst, space.newtuple([]),
space.newtuple(tup)])
def descr__setstate__(self, space, w_state):
self.w_value = space.getitem(w_state, space.newint(0))
def __repr__(self):
""" representation for debugging purposes """
if self.w_value is None:
content = ""
else:
content = repr(self.w_value)
return "<%s(%s) at 0x%x>" % (self.__class__.__name__,
content, uid(self))
def descr__repr__(self, space):
if self.w_value is None:
content = "empty"
else:
content = "%s object at 0x%s" % (space.type(self.w_value).name,
self.w_value.getaddrstring(space))
s = "<cell at 0x%s: %s>" % (self.getaddrstring(space), content)
return space.newtext(s)
def descr__cell_contents(self, space):
try:
return self.get()
except ValueError:
raise oefmt(space.w_ValueError, "Cell is empty")
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