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/* Cell object implementation */
#include "Python.h"
#include "pycore_cell.h" // PyCell_GetRef()
#include "pycore_modsupport.h" // _PyArg_NoKeywords()
#include "pycore_object.h"
#define _PyCell_CAST(op) _Py_CAST(PyCellObject*, (op))
PyObject *
PyCell_New(PyObject *obj)
{
PyCellObject *op;
op = (PyCellObject *)PyObject_GC_New(PyCellObject, &PyCell_Type);
if (op == NULL)
return NULL;
op->ob_ref = Py_XNewRef(obj);
_PyObject_GC_TRACK(op);
return (PyObject *)op;
}
PyDoc_STRVAR(cell_new_doc,
"cell([contents])\n"
"--\n"
"\n"
"Create a new cell object.\n"
"\n"
" contents\n"
" the contents of the cell. If not specified, the cell will be empty,\n"
" and \n further attempts to access its cell_contents attribute will\n"
" raise a ValueError.");
static PyObject *
cell_new(PyTypeObject *type, PyObject *args, PyObject *kwargs)
{
PyObject *return_value = NULL;
PyObject *obj = NULL;
if (!_PyArg_NoKeywords("cell", kwargs)) {
goto exit;
}
/* min = 0: we allow the cell to be empty */
if (!PyArg_UnpackTuple(args, "cell", 0, 1, &obj)) {
goto exit;
}
return_value = PyCell_New(obj);
exit:
return return_value;
}
PyObject *
PyCell_Get(PyObject *op)
{
if (!PyCell_Check(op)) {
PyErr_BadInternalCall();
return NULL;
}
return PyCell_GetRef((PyCellObject *)op);
}
int
PyCell_Set(PyObject *op, PyObject *value)
{
if (!PyCell_Check(op)) {
PyErr_BadInternalCall();
return -1;
}
PyCell_SetTakeRef((PyCellObject *)op, Py_XNewRef(value));
return 0;
}
static void
cell_dealloc(PyObject *self)
{
PyCellObject *op = _PyCell_CAST(self);
_PyObject_GC_UNTRACK(op);
Py_XDECREF(op->ob_ref);
PyObject_GC_Del(op);
}
static PyObject *
cell_compare_impl(PyObject *a, PyObject *b, int op)
{
if (a != NULL && b != NULL) {
return PyObject_RichCompare(a, b, op);
}
else {
Py_RETURN_RICHCOMPARE(b == NULL, a == NULL, op);
}
}
static PyObject *
cell_richcompare(PyObject *a, PyObject *b, int op)
{
/* neither argument should be NULL, unless something's gone wrong */
assert(a != NULL && b != NULL);
/* both arguments should be instances of PyCellObject */
if (!PyCell_Check(a) || !PyCell_Check(b)) {
Py_RETURN_NOTIMPLEMENTED;
}
PyObject *a_ref = PyCell_GetRef((PyCellObject *)a);
PyObject *b_ref = PyCell_GetRef((PyCellObject *)b);
/* compare cells by contents; empty cells come before anything else */
PyObject *res = cell_compare_impl(a_ref, b_ref, op);
Py_XDECREF(a_ref);
Py_XDECREF(b_ref);
return res;
}
static PyObject *
cell_repr(PyObject *self)
{
PyObject *ref = PyCell_GetRef((PyCellObject *)self);
if (ref == NULL) {
return PyUnicode_FromFormat("<cell at %p: empty>", self);
}
PyObject *res = PyUnicode_FromFormat("<cell at %p: %.80s object at %p>",
self, Py_TYPE(ref)->tp_name, ref);
Py_DECREF(ref);
return res;
}
static int
cell_traverse(PyObject *self, visitproc visit, void *arg)
{
PyCellObject *op = _PyCell_CAST(self);
Py_VISIT(op->ob_ref);
return 0;
}
static int
cell_clear(PyObject *self)
{
PyCellObject *op = _PyCell_CAST(self);
Py_CLEAR(op->ob_ref);
return 0;
}
static PyObject *
cell_get_contents(PyObject *self, void *closure)
{
PyCellObject *op = _PyCell_CAST(self);
PyObject *res = PyCell_GetRef(op);
if (res == NULL) {
PyErr_SetString(PyExc_ValueError, "Cell is empty");
return NULL;
}
return res;
}
static int
cell_set_contents(PyObject *self, PyObject *obj, void *Py_UNUSED(ignored))
{
PyCellObject *cell = _PyCell_CAST(self);
Py_XINCREF(obj);
PyCell_SetTakeRef((PyCellObject *)cell, obj);
return 0;
}
static PyGetSetDef cell_getsetlist[] = {
{"cell_contents", cell_get_contents, cell_set_contents, NULL},
{NULL} /* sentinel */
};
PyTypeObject PyCell_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"cell",
sizeof(PyCellObject),
0,
cell_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
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 */
cell_new_doc, /* tp_doc */
cell_traverse, /* tp_traverse */
cell_clear, /* tp_clear */
cell_richcompare, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
cell_getsetlist, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
cell_new, /* tp_new */
0, /* tp_free */
};
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