cpython/Objects/namespaceobject.c

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// namespace object implementation
#include "Python.h"
#include "structmember.h"
typedef struct {
PyObject_HEAD
PyObject *ns_dict;
} _PyNamespaceObject;
static PyMemberDef namespace_members[] = {
{"__dict__", T_OBJECT, offsetof(_PyNamespaceObject, ns_dict), READONLY},
{NULL}
};
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// Methods
static PyObject *
namespace_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyObject *self;
assert(type != NULL && type->tp_alloc != NULL);
self = type->tp_alloc(type, 0);
if (self != NULL) {
_PyNamespaceObject *ns = (_PyNamespaceObject *)self;
ns->ns_dict = PyDict_New();
if (ns->ns_dict == NULL) {
Py_DECREF(ns);
return NULL;
}
}
return self;
}
static int
namespace_init(_PyNamespaceObject *ns, PyObject *args, PyObject *kwds)
{
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// ignore args if it's NULL or empty
if (args != NULL) {
Py_ssize_t argcount = PyObject_Size(args);
if (argcount < 0)
return -1;
else if (argcount > 0) {
PyErr_Format(PyExc_TypeError, "no positional arguments expected");
return -1;
}
}
if (kwds == NULL)
return 0;
return PyDict_Update(ns->ns_dict, kwds);
}
static void
namespace_dealloc(_PyNamespaceObject *ns)
{
PyObject_GC_UnTrack(ns);
Py_CLEAR(ns->ns_dict);
Py_TYPE(ns)->tp_free((PyObject *)ns);
}
static PyObject *
namespace_repr(PyObject *ns)
{
int i, loop_error = 0;
PyObject *pairs = NULL, *d = NULL, *keys = NULL, *keys_iter = NULL;
PyObject *key;
PyObject *separator, *pairsrepr, *repr = NULL;
const char * name;
name = (Py_TYPE(ns) == &_PyNamespace_Type) ? "namespace"
: ns->ob_type->tp_name;
i = Py_ReprEnter(ns);
if (i != 0) {
return i > 0 ? PyUnicode_FromFormat("%s(...)", name) : NULL;
}
pairs = PyList_New(0);
if (pairs == NULL)
goto error;
d = ((_PyNamespaceObject *)ns)->ns_dict;
assert(d != NULL);
Py_INCREF(d);
keys = PyDict_Keys(d);
if (keys == NULL)
goto error;
if (PyList_Sort(keys) != 0)
goto error;
keys_iter = PyObject_GetIter(keys);
if (keys_iter == NULL)
goto error;
while ((key = PyIter_Next(keys_iter)) != NULL) {
if (PyUnicode_Check(key) && PyUnicode_GET_LENGTH(key) > 0) {
PyObject *value, *item;
value = PyDict_GetItem(d, key);
assert(value != NULL);
item = PyUnicode_FromFormat("%S=%R", key, value);
if (item == NULL) {
loop_error = 1;
}
else {
loop_error = PyList_Append(pairs, item);
Py_DECREF(item);
}
}
Py_DECREF(key);
if (loop_error)
goto error;
}
separator = PyUnicode_FromString(", ");
if (separator == NULL)
goto error;
pairsrepr = PyUnicode_Join(separator, pairs);
Py_DECREF(separator);
if (pairsrepr == NULL)
goto error;
repr = PyUnicode_FromFormat("%s(%S)", name, pairsrepr);
Py_DECREF(pairsrepr);
error:
Py_XDECREF(pairs);
Py_XDECREF(d);
Py_XDECREF(keys);
Py_XDECREF(keys_iter);
Py_ReprLeave(ns);
return repr;
}
static int
namespace_traverse(_PyNamespaceObject *ns, visitproc visit, void *arg)
{
Py_VISIT(ns->ns_dict);
return 0;
}
static int
namespace_clear(_PyNamespaceObject *ns)
{
Py_CLEAR(ns->ns_dict);
return 0;
}
static PyObject *
namespace_richcompare(PyObject *self, PyObject *other, int op)
{
if (PyObject_TypeCheck(self, &_PyNamespace_Type) &&
PyObject_TypeCheck(other, &_PyNamespace_Type))
return PyObject_RichCompare(((_PyNamespaceObject *)self)->ns_dict,
((_PyNamespaceObject *)other)->ns_dict, op);
Py_RETURN_NOTIMPLEMENTED;
}
PyDoc_STRVAR(namespace_reduce__doc__, "Return state information for pickling");
static PyObject *
namespace_reduce(_PyNamespaceObject *ns)
{
PyObject *result, *args = PyTuple_New(0);
if (!args)
return NULL;
result = PyTuple_Pack(3, (PyObject *)Py_TYPE(ns), args, ns->ns_dict);
Py_DECREF(args);
return result;
}
static PyMethodDef namespace_methods[] = {
{"__reduce__", (PyCFunction)namespace_reduce, METH_NOARGS,
namespace_reduce__doc__},
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{NULL, NULL} // sentinel
};
PyDoc_STRVAR(namespace_doc,
"A simple attribute-based namespace.\n\
\n\
SimpleNamespace(**kwargs)");
PyTypeObject _PyNamespace_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"types.SimpleNamespace", /* tp_name */
sizeof(_PyNamespaceObject), /* tp_size */
0, /* tp_itemsize */
(destructor)namespace_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
(reprfunc)namespace_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 */
PyObject_GenericSetAttr, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_BASETYPE, /* tp_flags */
namespace_doc, /* tp_doc */
(traverseproc)namespace_traverse, /* tp_traverse */
(inquiry)namespace_clear, /* tp_clear */
namespace_richcompare, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
namespace_methods, /* tp_methods */
namespace_members, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
offsetof(_PyNamespaceObject, ns_dict), /* tp_dictoffset */
(initproc)namespace_init, /* tp_init */
PyType_GenericAlloc, /* tp_alloc */
(newfunc)namespace_new, /* tp_new */
PyObject_GC_Del, /* tp_free */
};
PyObject *
_PyNamespace_New(PyObject *kwds)
{
PyObject *ns = namespace_new(&_PyNamespace_Type, NULL, NULL);
if (ns == NULL)
return NULL;
if (kwds == NULL)
return ns;
if (PyDict_Update(((_PyNamespaceObject *)ns)->ns_dict, kwds) != 0) {
Py_DECREF(ns);
return NULL;
}
return (PyObject *)ns;
}