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Make unicode subclassable.

This commit is contained in:
Guido van Rossum 2001-08-30 03:12:59 +00:00
parent ae960afb5e
commit e023fe0eef
1 changed files with 32 additions and 2 deletions
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34
Objects/unicodeobject.c
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@ -5298,6 +5298,9 @@ static PyBufferProcs unicode_as_buffer = {
(getcharbufferproc) unicode_buffer_getcharbuf,
};
staticforward PyObject *
unicode_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
static PyObject *
unicode_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
@ -5306,7 +5309,8 @@ unicode_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
char *encoding = NULL;
char *errors = NULL;
assert(type == &PyUnicode_Type);
if (type != &PyUnicode_Type)
return unicode_subtype_new(type, args, kwds);
if (!PyArg_ParseTupleAndKeywords(args, kwds, "|Oss:unicode",
kwlist, &x, &encoding, &errors))
return NULL;
@ -5315,6 +5319,32 @@ unicode_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
return PyUnicode_FromEncodedObject(x, encoding, errors);
}
static PyObject *
unicode_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyUnicodeObject *tmp, *new;
int n;
assert(PyType_IsSubtype(type, &PyUnicode_Type));
tmp = (PyUnicodeObject *)unicode_new(&PyUnicode_Type, args, kwds);
if (tmp == NULL)
return NULL;
assert(PyUnicode_Check(tmp));
new = (PyUnicodeObject *) type->tp_alloc(type, n = tmp->length);
if (new == NULL)
return NULL;
new->str = PyMem_NEW(Py_UNICODE, n+1);
if (new->str == NULL) {
_Py_ForgetReference((PyObject *)new);
PyObject_DEL(new);
return NULL;
}
Py_UNICODE_COPY(new->str, tmp->str, n+1);
new->length = n;
Py_DECREF(tmp);
return (PyObject *)new;
}
static char unicode_doc[] =
"unicode(string [, encoding[, errors]]) -> object\n\
\n\
@ -5344,7 +5374,7 @@ PyTypeObject PyUnicode_Type = {
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
&unicode_as_buffer, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
unicode_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */