bpo-33201: Modernize "Extension types" doc (GH-6337)
* bpo-33201: Modernize "Extension types" doc
* Split tutorial and other topics
* Some small fixes
* Address some review comments
* Rename noddy* to custom* and shoddy to sublist
* Fix markup
diff --git a/Doc/includes/custom4.c b/Doc/includes/custom4.c
new file mode 100644
index 0000000..0994d8f
--- /dev/null
+++ b/Doc/includes/custom4.c
@@ -0,0 +1,197 @@
+#include <Python.h>
+#include "structmember.h"
+
+typedef struct {
+ PyObject_HEAD
+ PyObject *first; /* first name */
+ PyObject *last; /* last name */
+ int number;
+} CustomObject;
+
+static int
+Custom_traverse(CustomObject *self, visitproc visit, void *arg)
+{
+ Py_VISIT(self->first);
+ Py_VISIT(self->last);
+ return 0;
+}
+
+static int
+Custom_clear(CustomObject *self)
+{
+ Py_CLEAR(self->first);
+ Py_CLEAR(self->last);
+ return 0;
+}
+
+static void
+Custom_dealloc(CustomObject *self)
+{
+ PyObject_GC_UnTrack(self);
+ Custom_clear(self);
+ Py_TYPE(self)->tp_free((PyObject *) self);
+}
+
+static PyObject *
+Custom_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+ CustomObject *self;
+ self = (CustomObject *) type->tp_alloc(type, 0);
+ if (self != NULL) {
+ self->first = PyUnicode_FromString("");
+ if (self->first == NULL) {
+ Py_DECREF(self);
+ return NULL;
+ }
+ self->last = PyUnicode_FromString("");
+ if (self->last == NULL) {
+ Py_DECREF(self);
+ return NULL;
+ }
+ self->number = 0;
+ }
+ return (PyObject *) self;
+}
+
+static int
+Custom_init(CustomObject *self, PyObject *args, PyObject *kwds)
+{
+ static char *kwlist[] = {"first", "last", "number", NULL};
+ PyObject *first = NULL, *last = NULL, *tmp;
+
+ if (!PyArg_ParseTupleAndKeywords(args, kwds, "|UUi", kwlist,
+ &first, &last,
+ &self->number))
+ return -1;
+
+ if (first) {
+ tmp = self->first;
+ Py_INCREF(first);
+ self->first = first;
+ Py_DECREF(tmp);
+ }
+ if (last) {
+ tmp = self->last;
+ Py_INCREF(last);
+ self->last = last;
+ Py_DECREF(tmp);
+ }
+ return 0;
+}
+
+static PyMemberDef Custom_members[] = {
+ {"number", T_INT, offsetof(CustomObject, number), 0,
+ "custom number"},
+ {NULL} /* Sentinel */
+};
+
+static PyObject *
+Custom_getfirst(CustomObject *self, void *closure)
+{
+ Py_INCREF(self->first);
+ return self->first;
+}
+
+static int
+Custom_setfirst(CustomObject *self, PyObject *value, void *closure)
+{
+ if (value == NULL) {
+ PyErr_SetString(PyExc_TypeError, "Cannot delete the first attribute");
+ return -1;
+ }
+ if (!PyUnicode_Check(value)) {
+ PyErr_SetString(PyExc_TypeError,
+ "The first attribute value must be a string");
+ return -1;
+ }
+ Py_INCREF(value);
+ Py_CLEAR(self->first);
+ self->first = value;
+ return 0;
+}
+
+static PyObject *
+Custom_getlast(CustomObject *self, void *closure)
+{
+ Py_INCREF(self->last);
+ return self->last;
+}
+
+static int
+Custom_setlast(CustomObject *self, PyObject *value, void *closure)
+{
+ if (value == NULL) {
+ PyErr_SetString(PyExc_TypeError, "Cannot delete the last attribute");
+ return -1;
+ }
+ if (!PyUnicode_Check(value)) {
+ PyErr_SetString(PyExc_TypeError,
+ "The last attribute value must be a string");
+ return -1;
+ }
+ Py_INCREF(value);
+ Py_CLEAR(self->last);
+ self->last = value;
+ return 0;
+}
+
+static PyGetSetDef Custom_getsetters[] = {
+ {"first", (getter) Custom_getfirst, (setter) Custom_setfirst,
+ "first name", NULL},
+ {"last", (getter) Custom_getlast, (setter) Custom_setlast,
+ "last name", NULL},
+ {NULL} /* Sentinel */
+};
+
+static PyObject *
+Custom_name(CustomObject *self, PyObject *Py_UNUSED(ignored))
+{
+ return PyUnicode_FromFormat("%S %S", self->first, self->last);
+}
+
+static PyMethodDef Custom_methods[] = {
+ {"name", (PyCFunction) Custom_name, METH_NOARGS,
+ "Return the name, combining the first and last name"
+ },
+ {NULL} /* Sentinel */
+};
+
+static PyTypeObject CustomType = {
+ PyVarObject_HEAD_INIT(NULL, 0)
+ .tp_name = "custom4.Custom",
+ .tp_doc = "Custom objects",
+ .tp_basicsize = sizeof(CustomObject),
+ .tp_itemsize = 0,
+ .tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+ .tp_new = Custom_new,
+ .tp_init = (initproc) Custom_init,
+ .tp_dealloc = (destructor) Custom_dealloc,
+ .tp_traverse = (traverseproc) Custom_traverse,
+ .tp_clear = (inquiry) Custom_clear,
+ .tp_members = Custom_members,
+ .tp_methods = Custom_methods,
+ .tp_getset = Custom_getsetters,
+};
+
+static PyModuleDef custommodule = {
+ PyModuleDef_HEAD_INIT,
+ .m_name = "custom4",
+ .m_doc = "Example module that creates an extension type.",
+ .m_size = -1,
+};
+
+PyMODINIT_FUNC
+PyInit_custom4(void)
+{
+ PyObject *m;
+ if (PyType_Ready(&CustomType) < 0)
+ return NULL;
+
+ m = PyModule_Create(&custommodule);
+ if (m == NULL)
+ return NULL;
+
+ Py_INCREF(&CustomType);
+ PyModule_AddObject(m, "Custom", (PyObject *) &CustomType);
+ return m;
+}