#include "Python.h"

#include "structmember.h" // PyMemberDef

typedef struct {

PyObject_HEAD

PyObject *ns_dict;

} _PyNamespaceObject;

static PyMemberDef namespace_members[] = {

{"__dict__", T_OBJECT, offsetof(_PyNamespaceObject, ns_dict), READONLY},

{NULL}

};

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)

{

if (PyTuple_GET_SIZE(args) != 0) {

PyErr_Format(PyExc_TypeError, "no positional arguments expected");

return -1;

}

if (kwds == NULL) {

return 0;

}

if (!PyArg_ValidateKeywordArguments(kwds)) {

return -1;

}

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_IS_TYPE(ns, &_PyNamespace_Type) ? "namespace"

: Py_TYPE(ns)->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_GetItemWithError(d, key);

if (value != NULL) {

item = PyUnicode_FromFormat("%U=%R", key, value);

if (item == NULL) {

loop_error = 1;

}

else {

loop_error = PyList_Append(pairs, item);

Py_DECREF(item);

}

}

else if (PyErr_Occurred()) {

loop_error = 1;

}

}

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 *Py_UNUSED(ignored))

{

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__},

{NULL, NULL} // sentinel

};

PyDoc_STRVAR(namespace_doc,

SimpleNamespace(**kwargs)");

PyTypeObject _PyNamespace_Type = {

PyVarObject_HEAD_INIT(&PyType_Type, 0)

"types.SimpleNamespace", /* tp_name */

sizeof(_PyNamespaceObject), /* tp_basicsize */

0, /* tp_itemsize */

(destructor)namespace_dealloc, /* tp_dealloc */

0, /* tp_vectorcall_offset */

0, /* tp_getattr */

0, /* tp_setattr */

0, /* tp_as_async */

(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;

}