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Make str and tuple types subclassable.

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This commit is contained in:
Guido van Rossum 2001-08-30 03:11:59 +00:00
parent 147b13c069
commit ae960afb5e
2 changed files with 54 additions and 4 deletions
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26
Objects/stringobject.c
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@ -2683,13 +2683,17 @@ string_methods[] = {
{NULL, NULL} /* sentinel */
};
staticforward PyObject *
str_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
static PyObject *
string_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyObject *x = NULL;
static char *kwlist[] = {"object", 0};
assert(type == &PyString_Type);
if (type != &PyString_Type)
return str_subtype_new(type, args, kwds);
if (!PyArg_ParseTupleAndKeywords(args, kwds, "|O:str", kwlist, &x))
return NULL;
if (x == NULL)
@ -2697,6 +2701,24 @@ string_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
return PyObject_Str(x);
}
static PyObject *
str_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyObject *tmp, *new;
int n;
assert(PyType_IsSubtype(type, &PyString_Type));
tmp = string_new(&PyString_Type, args, kwds);
if (tmp == NULL)
return NULL;
assert(PyString_Check(tmp));
new = type->tp_alloc(type, n = PyString_GET_SIZE(tmp));
if (new == NULL)
return NULL;
memcpy(PyString_AS_STRING(new), PyString_AS_STRING(tmp), n+1);
return new;
}
static char string_doc[] =
"str(object) -> string\n\
\n\
@ -2724,7 +2746,7 @@ PyTypeObject PyString_Type = {
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
&string_as_buffer, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
string_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */