Implement PEP 3115 -- new metaclass syntax and semantics.
The compiler package hasn't been updated yet; test_compiler.py fails.
Otherwise all tests seem to be passing now. There are no occurrences
of __metaclass__ left in the standard library.
Docs have not been updated.
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 5d87744..4aa9c62 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -31,6 +31,113 @@
static PyObject *filtertuple (PyObject *, PyObject *);
static PyObject *
+builtin___build_class__(PyObject *self, PyObject *args, PyObject *kwds)
+{
+ PyObject *func, *name, *bases, *mkw, *meta, *prep, *ns, *res;
+ Py_ssize_t nargs, nbases;
+
+ assert(args != NULL);
+ if (!PyTuple_Check(args)) {
+ PyErr_SetString(PyExc_TypeError,
+ "__build_class__: args is not a tuple");
+ return NULL;
+ }
+ nargs = PyTuple_GET_SIZE(args);
+ if (nargs < 2) {
+ PyErr_SetString(PyExc_TypeError,
+ "__build_class__: not enough arguments");
+ return NULL;
+ }
+ func = PyTuple_GET_ITEM(args, 0); /* Better be callable */
+ name = PyTuple_GET_ITEM(args, 1);
+ if (!PyString_Check(name)) {
+ PyErr_SetString(PyExc_TypeError,
+ "__build_class__: name is not a string");
+ return NULL;
+ }
+ bases = PyTuple_GetSlice(args, 2, nargs);
+ if (bases == NULL)
+ return NULL;
+ nbases = nargs - 2;
+
+ if (kwds == NULL) {
+ meta = NULL;
+ mkw = NULL;
+ }
+ else {
+ mkw = PyDict_Copy(kwds); /* Don't modify kwds passed in! */
+ if (mkw == NULL) {
+ Py_DECREF(bases);
+ return NULL;
+ }
+ meta = PyDict_GetItemString(mkw, "metaclass");
+ if (meta != NULL) {
+ Py_INCREF(meta);
+ if (PyDict_DelItemString(mkw, "metaclass") < 0) {
+ Py_DECREF(meta);
+ Py_DECREF(mkw);
+ Py_DECREF(bases);
+ return NULL;
+ }
+ }
+ }
+ if (meta == NULL) {
+ if (PyTuple_GET_SIZE(bases) == 0)
+ meta = (PyObject *) (&PyType_Type);
+ else {
+ PyObject *base0 = PyTuple_GET_ITEM(bases, 0);
+ meta = (PyObject *) (base0->ob_type);
+ }
+ Py_INCREF(meta);
+ }
+ prep = PyObject_GetAttrString(meta, "__prepare__");
+ if (prep == NULL) {
+ PyErr_Clear();
+ ns = PyDict_New();
+ }
+ else {
+ PyObject *pargs = Py_BuildValue("OO", name, bases);
+ if (pargs == NULL) {
+ Py_DECREF(prep);
+ Py_DECREF(meta);
+ Py_XDECREF(mkw);
+ Py_DECREF(bases);
+ return NULL;
+ }
+ ns = PyEval_CallObjectWithKeywords(prep, pargs, mkw);
+ Py_DECREF(pargs);
+ Py_DECREF(prep);
+ if (ns == NULL) {
+ Py_DECREF(meta);
+ Py_XDECREF(mkw);
+ Py_DECREF(bases);
+ return NULL;
+ }
+ }
+ res = PyObject_CallFunctionObjArgs(func, ns, NULL);
+ if (res != NULL) {
+ PyObject *margs;
+ Py_DECREF(res);
+ res = NULL;
+ margs = Py_BuildValue("OOO", name, bases, ns);
+ if (margs != NULL) {
+ res = PyEval_CallObjectWithKeywords(meta, margs, mkw);
+ Py_DECREF(margs);
+ }
+ }
+ Py_DECREF(ns);
+ Py_DECREF(meta);
+ Py_XDECREF(mkw);
+ Py_DECREF(bases);
+ return res;
+}
+
+PyDoc_STRVAR(build_class_doc,
+"__build_class__(func, name, *bases, metaclass=None, **kwds) -> class\n\
+\n\
+Internal helper function used by the class statement.");
+
+static PyObject *
builtin___import__(PyObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"name", "globals", "locals", "fromlist",
@@ -2103,6 +2210,8 @@
static PyMethodDef builtin_methods[] = {
+ {"__build_class__", (PyCFunction)builtin___build_class__,
+ METH_VARARGS | METH_KEYWORDS, build_class_doc},
{"__import__", (PyCFunction)builtin___import__, METH_VARARGS | METH_KEYWORDS, import_doc},
{"abs", builtin_abs, METH_O, abs_doc},
{"all", builtin_all, METH_O, all_doc},