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/* Cell object implementation */
#include "Python.h"
PyObject *
PyCell_New(PyObject *obj)
{
PyCellObject *op;
op = (PyCellObject *)PyObject_GC_New(PyCellObject, &PyCell_Type);
if (op == NULL)
return NULL;
op->ob_ref = obj;
Py_XINCREF(obj);
_PyObject_GC_TRACK(op);
return (PyObject *)op;
}
PyObject *
PyCell_Get(PyObject *op)
{
if (!PyCell_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
Py_XINCREF(((PyCellObject*)op)->ob_ref);
return PyCell_GET(op);
}
int
PyCell_Set(PyObject *op, PyObject *obj)
{
PyObject* oldobj;
if (!PyCell_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
oldobj = PyCell_GET(op);
Py_XINCREF(obj);
PyCell_SET(op, obj);
Py_XDECREF(oldobj);
return 0;
}
static void
cell_dealloc(PyCellObject *op)
{
_PyObject_GC_UNTRACK(op);
Py_XDECREF(op->ob_ref);
PyObject_GC_Del(op);
}
static int
cell_compare(PyCellObject *a, PyCellObject *b)
{
/* Py3K warning for comparisons */
if (PyErr_WarnPy3k("cell comparisons not supported in 3.x",
1) < 0) {
return -2;
}
if (a->ob_ref == NULL) {
if (b->ob_ref == NULL)
return 0;
return -1;
} else if (b->ob_ref == NULL)
return 1;
return PyObject_Compare(a->ob_ref, b->ob_ref);
}
static PyObject *
cell_repr(PyCellObject *op)
{
if (op->ob_ref == NULL)
return PyString_FromFormat("<cell at %p: empty>", op);
return PyString_FromFormat("<cell at %p: %.80s object at %p>",
op, op->ob_ref->ob_type->tp_name,
op->ob_ref);
}
static int
cell_traverse(PyCellObject *op, visitproc visit, void *arg)
{
Py_VISIT(op->ob_ref);
return 0;
}
static int
cell_clear(PyCellObject *op)
{
Py_CLEAR(op->ob_ref);
return 0;
}
static PyObject *
cell_get_contents(PyCellObject *op, void *closure)
{
if (op->ob_ref == NULL)
{
PyErr_SetString(PyExc_ValueError, "Cell is empty");
return NULL;
}
Py_INCREF(op->ob_ref);
return op->ob_ref;
}
static PyGetSetDef cell_getsetlist[] = {
{"cell_contents", (getter)cell_get_contents, NULL},
{NULL} /* sentinel */
};
PyTypeObject PyCell_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"cell",
sizeof(PyCellObject),
0,
(destructor)cell_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
(cmpfunc)cell_compare, /* tp_compare */
(reprfunc)cell_repr, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
0, /* tp_doc */
(traverseproc)cell_traverse, /* tp_traverse */
(inquiry)cell_clear, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
cell_getsetlist, /* tp_getset */
};
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