1 // namespace object implementation
2
3 #include "Python.h"
4 #include "pycore_namespace.h" // _PyNamespace_Type
5 #include "structmember.h" // PyMemberDef
6
7
8 typedef struct {
9 PyObject_HEAD
10 PyObject *ns_dict;
11 } _PyNamespaceObject;
12
13
14 static PyMemberDef namespace_members[] = {
15 {"__dict__", T_OBJECT, offsetof(_PyNamespaceObject, ns_dict), READONLY},
16 {NULL}
17 };
18
19
20 // Methods
21
22 static PyObject *
23 namespace_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
24 {
25 PyObject *self;
26
27 assert(type != NULL && type->tp_alloc != NULL);
28 self = type->tp_alloc(type, 0);
29 if (self != NULL) {
30 _PyNamespaceObject *ns = (_PyNamespaceObject *)self;
31 ns->ns_dict = PyDict_New();
32 if (ns->ns_dict == NULL) {
33 Py_DECREF(ns);
34 return NULL;
35 }
36 }
37 return self;
38 }
39
40
41 static int
42 namespace_init(_PyNamespaceObject *ns, PyObject *args, PyObject *kwds)
43 {
44 if (PyTuple_GET_SIZE(args) != 0) {
45 PyErr_Format(PyExc_TypeError, "no positional arguments expected");
46 return -1;
47 }
48 if (kwds == NULL) {
49 return 0;
50 }
51 if (!PyArg_ValidateKeywordArguments(kwds)) {
52 return -1;
53 }
54 return PyDict_Update(ns->ns_dict, kwds);
55 }
56
57
58 static void
59 namespace_dealloc(_PyNamespaceObject *ns)
60 {
61 PyObject_GC_UnTrack(ns);
62 Py_CLEAR(ns->ns_dict);
63 Py_TYPE(ns)->tp_free((PyObject *)ns);
64 }
65
66
67 static PyObject *
68 namespace_repr(PyObject *ns)
69 {
70 int i, loop_error = 0;
71 PyObject *pairs = NULL, *d = NULL, *keys = NULL, *keys_iter = NULL;
72 PyObject *key;
73 PyObject *separator, *pairsrepr, *repr = NULL;
74 const char * name;
75
76 name = Py_IS_TYPE(ns, &_PyNamespace_Type) ? "namespace"
77 : Py_TYPE(ns)->tp_name;
78
79 i = Py_ReprEnter(ns);
80 if (i != 0) {
81 return i > 0 ? PyUnicode_FromFormat("%s(...)", name) : NULL;
82 }
83
84 pairs = PyList_New(0);
85 if (pairs == NULL)
86 goto error;
87
88 d = ((_PyNamespaceObject *)ns)->ns_dict;
89 assert(d != NULL);
90 Py_INCREF(d);
91
92 keys = PyDict_Keys(d);
93 if (keys == NULL)
94 goto error;
95
96 keys_iter = PyObject_GetIter(keys);
97 if (keys_iter == NULL)
98 goto error;
99
100 while ((key = PyIter_Next(keys_iter)) != NULL) {
101 if (PyUnicode_Check(key) && PyUnicode_GET_LENGTH(key) > 0) {
102 PyObject *value, *item;
103
104 value = PyDict_GetItemWithError(d, key);
105 if (value != NULL) {
106 item = PyUnicode_FromFormat("%U=%R", key, value);
107 if (item == NULL) {
108 loop_error = 1;
109 }
110 else {
111 loop_error = PyList_Append(pairs, item);
112 Py_DECREF(item);
113 }
114 }
115 else if (PyErr_Occurred()) {
116 loop_error = 1;
117 }
118 }
119
120 Py_DECREF(key);
121 if (loop_error)
122 goto error;
123 }
124
125 separator = PyUnicode_FromString(", ");
126 if (separator == NULL)
127 goto error;
128
129 pairsrepr = PyUnicode_Join(separator, pairs);
130 Py_DECREF(separator);
131 if (pairsrepr == NULL)
132 goto error;
133
134 repr = PyUnicode_FromFormat("%s(%S)", name, pairsrepr);
135 Py_DECREF(pairsrepr);
136
137 error:
138 Py_XDECREF(pairs);
139 Py_XDECREF(d);
140 Py_XDECREF(keys);
141 Py_XDECREF(keys_iter);
142 Py_ReprLeave(ns);
143
144 return repr;
145 }
146
147
148 static int
149 namespace_traverse(_PyNamespaceObject *ns, visitproc visit, void *arg)
150 {
151 Py_VISIT(ns->ns_dict);
152 return 0;
153 }
154
155
156 static int
157 namespace_clear(_PyNamespaceObject *ns)
158 {
159 Py_CLEAR(ns->ns_dict);
160 return 0;
161 }
162
163
164 static PyObject *
165 namespace_richcompare(PyObject *self, PyObject *other, int op)
166 {
167 if (PyObject_TypeCheck(self, &_PyNamespace_Type) &&
168 PyObject_TypeCheck(other, &_PyNamespace_Type))
169 return PyObject_RichCompare(((_PyNamespaceObject *)self)->ns_dict,
170 ((_PyNamespaceObject *)other)->ns_dict, op);
171 Py_RETURN_NOTIMPLEMENTED;
172 }
173
174
175 PyDoc_STRVAR(namespace_reduce__doc__, "Return state information for pickling");
176
177 static PyObject *
178 namespace_reduce(_PyNamespaceObject *ns, PyObject *Py_UNUSED(ignored))
179 {
180 PyObject *result, *args = PyTuple_New(0);
181
182 if (!args)
183 return NULL;
184
185 result = PyTuple_Pack(3, (PyObject *)Py_TYPE(ns), args, ns->ns_dict);
186 Py_DECREF(args);
187 return result;
188 }
189
190
191 static PyMethodDef namespace_methods[] = {
192 {"__reduce__", (PyCFunction)namespace_reduce, METH_NOARGS,
193 namespace_reduce__doc__},
194 {NULL, NULL} // sentinel
195 };
196
197
198 PyDoc_STRVAR(namespace_doc,
199 "A simple attribute-based namespace.\n\
200 \n\
201 SimpleNamespace(**kwargs)");
202
203 PyTypeObject _PyNamespace_Type = {
204 PyVarObject_HEAD_INIT(&PyType_Type, 0)
205 "types.SimpleNamespace", /* tp_name */
206 sizeof(_PyNamespaceObject), /* tp_basicsize */
207 0, /* tp_itemsize */
208 (destructor)namespace_dealloc, /* tp_dealloc */
209 0, /* tp_vectorcall_offset */
210 0, /* tp_getattr */
211 0, /* tp_setattr */
212 0, /* tp_as_async */
213 (reprfunc)namespace_repr, /* tp_repr */
214 0, /* tp_as_number */
215 0, /* tp_as_sequence */
216 0, /* tp_as_mapping */
217 0, /* tp_hash */
218 0, /* tp_call */
219 0, /* tp_str */
220 PyObject_GenericGetAttr, /* tp_getattro */
221 PyObject_GenericSetAttr, /* tp_setattro */
222 0, /* tp_as_buffer */
223 Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
224 Py_TPFLAGS_BASETYPE, /* tp_flags */
225 namespace_doc, /* tp_doc */
226 (traverseproc)namespace_traverse, /* tp_traverse */
227 (inquiry)namespace_clear, /* tp_clear */
228 namespace_richcompare, /* tp_richcompare */
229 0, /* tp_weaklistoffset */
230 0, /* tp_iter */
231 0, /* tp_iternext */
232 namespace_methods, /* tp_methods */
233 namespace_members, /* tp_members */
234 0, /* tp_getset */
235 0, /* tp_base */
236 0, /* tp_dict */
237 0, /* tp_descr_get */
238 0, /* tp_descr_set */
239 offsetof(_PyNamespaceObject, ns_dict), /* tp_dictoffset */
240 (initproc)namespace_init, /* tp_init */
241 PyType_GenericAlloc, /* tp_alloc */
242 (newfunc)namespace_new, /* tp_new */
243 PyObject_GC_Del, /* tp_free */
244 };
245
246
247 PyObject *
248 _PyNamespace_New(PyObject *kwds)
249 {
250 PyObject *ns = namespace_new(&_PyNamespace_Type, NULL, NULL);
251 if (ns == NULL)
252 return NULL;
253
254 if (kwds == NULL)
255 return ns;
256 if (PyDict_Update(((_PyNamespaceObject *)ns)->ns_dict, kwds) != 0) {
257 Py_DECREF(ns);
258 return NULL;
259 }
260
261 return (PyObject *)ns;
262 }