Eric Snow's implementation of PEP 421.
Issue 14673: Add sys.implementation
diff --git a/Objects/namespaceobject.c b/Objects/namespaceobject.c
new file mode 100644
index 0000000..753874c
--- /dev/null
+++ b/Objects/namespaceobject.c
@@ -0,0 +1,225 @@
+/* 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}
+};
+
+
+/* Methods */
+
+static PyObject *
+namespace_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+ _PyNamespaceObject *ns;
+ ns = PyObject_GC_New(_PyNamespaceObject, &_PyNamespace_Type);
+ if (ns == NULL)
+ return NULL;
+
+ ns->ns_dict = PyDict_New();
+ if (ns->ns_dict == NULL) {
+ Py_DECREF(ns);
+ return NULL;
+ }
+
+ PyObject_GC_Track(ns);
+ return (PyObject *)ns;
+}
+
+
+static int
+namespace_init(_PyNamespaceObject *ns, PyObject *args, PyObject *kwds)
+{
+ /* ignore args if it's NULL or empty */
+ if (args != NULL) {
+ Py_ssize_t argcount = PyObject_Size(args);
+ if (argcount < 0)
+ return argcount;
+ 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(_PyNamespaceObject *ns)
+{
+ int i, loop_error = 0;
+ PyObject *pairs = NULL, *d = NULL, *keys = NULL, *keys_iter = NULL;
+ PyObject *key;
+ PyObject *separator, *pairsrepr, *repr = NULL;
+
+ i = Py_ReprEnter((PyObject *)ns);
+ if (i != 0) {
+ return i > 0 ? PyUnicode_FromString("namespace(...)") : 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_SIZE(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)",
+ ((PyObject *)ns)->ob_type->tp_name, pairsrepr);
+ Py_DECREF(pairsrepr);
+
+error:
+ Py_XDECREF(pairs);
+ Py_XDECREF(d);
+ Py_XDECREF(keys);
+ Py_XDECREF(keys_iter);
+ Py_ReprLeave((PyObject *)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;
+}
+
+
+PyDoc_STRVAR(namespace_doc,
+"A simple attribute-based namespace.\n\
+\n\
+namespace(**kwargs)");
+
+PyTypeObject _PyNamespace_Type = {
+ PyVarObject_HEAD_INIT(&PyType_Type, 0)
+ "namespace", /* 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 */
+ 0, /* tp_richcompare */
+ 0, /* tp_weaklistoffset */
+ 0, /* tp_iter */
+ 0, /* tp_iternext */
+ 0, /* 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;
+}