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PyAPI: add function to get an RNA subclass 

This is inconvenient in regular Python, add a class-method
to perform the operation, eg:

bpy.types.Node.bl_rna_find_subclass("CustomNodeType")
This commit is contained in:
Campbell Barton 2017-09-07 23:53:02 +10:00
parent accc94dd73
commit e44bf43f6c
1 changed files with 61 additions and 0 deletions
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61
source/blender/python/intern/bpy_rna.c
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@ -3707,6 +3707,66 @@ static PyObject *pyrna_struct_type_recast(BPy_StructRNA *self)
return pyrna_struct_CreatePyObject(&r_ptr);
}
/**
* \note Return value is borrowed, caller must incref.
*/
static PyObject *pyrna_struct_bl_rna_find_subclass_recursive(PyObject *cls, const char *id)
{
PyObject *ret_test = NULL;
PyObject *subclasses = ((PyTypeObject *)cls)->tp_subclasses;
if (subclasses) {
/* Unfortunately we can't use the dict key because Python class names
* don't match the bl_idname used internally. */
BLI_assert(PyDict_CheckExact(subclasses));
PyObject *key = NULL;
Py_ssize_t pos = 0;
PyObject *value = NULL;
while (PyDict_Next(subclasses, &pos, &key, &value)) {
BLI_assert(PyWeakref_CheckRef(value));
PyObject *subcls = PyWeakref_GET_OBJECT(value);
if (subcls != Py_None) {
BPy_StructRNA *py_srna = (BPy_StructRNA *)PyDict_GetItem(
((PyTypeObject *)subcls)->tp_dict, bpy_intern_str_bl_rna);
if (py_srna) {
StructRNA *srna = py_srna->ptr.data;
if (STREQ(id, RNA_struct_identifier(srna))) {
ret_test = subcls;
break;
}
}
ret_test = pyrna_struct_bl_rna_find_subclass_recursive(subcls, id);
if (ret_test) {
break;
}
}
}
}
return ret_test;
}
PyDoc_STRVAR(pyrna_struct_bl_rna_get_subclass_doc,
".. classmethod:: bl_rna_get_subclass(id, default=None)\n"
"\n"
" :arg id: The RNA type identifier.\n"
" :type vector: string\n"
" :return: The class or default when not found.\n"
" :rtype: type\n"
);
static PyObject *pyrna_struct_bl_rna_get_subclass(PyObject *cls, PyObject *args)
{
char *id;
PyObject *ret_default = Py_None;
if (!PyArg_ParseTuple(args, "s|O:bl_rna_find_subclass", &id, &ret_default)) {
return NULL;
}
PyObject *ret = pyrna_struct_bl_rna_find_subclass_recursive(cls, id);
if (ret == NULL) {
ret = ret_default;
}
return Py_INCREF_RET(ret);
}
static void pyrna_dir_members_py__add_keys(PyObject *list, PyObject *dict)
{
PyObject *list_tmp;
@ -5005,6 +5065,7 @@ static struct PyMethodDef pyrna_struct_methods[] = {
{"path_resolve", (PyCFunction)pyrna_struct_path_resolve, METH_VARARGS, pyrna_struct_path_resolve_doc},
{"path_from_id", (PyCFunction)pyrna_struct_path_from_id, METH_VARARGS, pyrna_struct_path_from_id_doc},
{"type_recast", (PyCFunction)pyrna_struct_type_recast, METH_NOARGS, pyrna_struct_type_recast_doc},
{"bl_rna_get_subclass", (PyCFunction) pyrna_struct_bl_rna_get_subclass, METH_VARARGS | METH_CLASS, pyrna_struct_bl_rna_get_subclass_doc},
{"__dir__", (PyCFunction)pyrna_struct_dir, METH_NOARGS, NULL},
/* experimental */