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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup pythonintern
*
* This file defines the API to support temporarily creating #Main data.
* The only use case for this is currently to support temporarily loading data-blocks
* which can be freed, without them polluting the current #G_MAIN.
*
* This is exposed via a context manager `bpy.types.BlendData.temp_data(...)`
* which returns a new `bpy.types.BlendData` that is freed once the context manager exits.
*/
#include <Python.h>
#include <stddef.h>
#include "BLI_string.h"
#include "BLI_utildefines.h"
#include "BKE_global.h"
#include "BKE_main.h"
#include "RNA_access.h"
#include "RNA_prototypes.h"
#include "bpy_rna.h"
#include "bpy_rna_data.h"
typedef struct {
PyObject_HEAD /* Required Python macro. */
BPy_StructRNA *data_rna;
char filepath[1024];
} BPy_DataContext;
static PyObject *bpy_rna_data_temp_data(PyObject *self, PyObject *args, PyObject *kwds);
static PyObject *bpy_rna_data_context_enter(BPy_DataContext *self);
static PyObject *bpy_rna_data_context_exit(BPy_DataContext *self, PyObject *args);
static PyMethodDef bpy_rna_data_context_methods[] = {
{"__enter__", (PyCFunction)bpy_rna_data_context_enter, METH_NOARGS},
{"__exit__", (PyCFunction)bpy_rna_data_context_exit, METH_VARARGS},
{NULL} /* sentinel */
};
static int bpy_rna_data_context_traverse(BPy_DataContext *self, visitproc visit, void *arg)
{
Py_VISIT(self->data_rna);
return 0;
}
static int bpy_rna_data_context_clear(BPy_DataContext *self)
{
Py_CLEAR(self->data_rna);
return 0;
}
static void bpy_rna_data_context_dealloc(BPy_DataContext *self)
{
PyObject_GC_UnTrack(self);
Py_CLEAR(self->data_rna);
PyObject_GC_Del(self);
}
static PyTypeObject bpy_rna_data_context_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
/*tp_name*/ "bpy_rna_data_context",
/*tp_basicsize*/ sizeof(BPy_DataContext),
/*tp_itemsize*/ 0,
/*tp_dealloc*/ (destructor)bpy_rna_data_context_dealloc,
/*tp_vectorcall_offset*/ 0,
/*tp_getattr*/ NULL,
/*tp_setattr*/ NULL,
/*tp_as_async*/ NULL,
/*tp_repr*/ NULL,
/*tp_as_number*/ NULL,
/*tp_as_sequence*/ NULL,
/*tp_as_mapping*/ NULL,
/*tp_hash*/ NULL,
/*tp_call*/ NULL,
/*tp_str*/ NULL,
/*tp_getattro*/ NULL,
/*tp_setattro*/ NULL,
/*tp_as_buffer*/ NULL,
/*tp_flags*/ Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
/*tp_doc*/ NULL,
/*tp_traverse*/ (traverseproc)bpy_rna_data_context_traverse,
/*tp_clear*/ (inquiry)bpy_rna_data_context_clear,
/*tp_richcompare*/ NULL,
/*tp_weaklistoffset*/ 0,
/*tp_iter*/ NULL,
/*tp_iternext*/ NULL,
/*tp_methods*/ bpy_rna_data_context_methods,
/*tp_members*/ NULL,
/*tp_getset*/ NULL,
/*tp_base*/ NULL,
/*tp_dict*/ NULL,
/*tp_descr_get*/ NULL,
/*tp_descr_set*/ NULL,
/*tp_dictoffset*/ 0,
/*tp_init*/ NULL,
/*tp_alloc*/ NULL,
/*tp_new*/ NULL,
/*tp_free*/ NULL,
/*tp_is_gc*/ NULL,
/*tp_bases*/ NULL,
/*tp_mro*/ NULL,
/*tp_cache*/ NULL,
/*tp_subclasses*/ NULL,
/*tp_weaklist*/ NULL,
/*tp_del*/ NULL,
/*tp_version_tag*/ 0,
/*tp_finalize*/ NULL,
/*tp_vectorcall*/ NULL,
};
PyDoc_STRVAR(bpy_rna_data_context_load_doc,
".. method:: temp_data(filepath=None)\n"
"\n"
" A context manager that temporarily creates blender file data.\n"
"\n"
" :arg filepath: The file path for the newly temporary data. "
"When None, the path of the currently open file is used.\n"
" :type filepath: str or NoneType\n"
"\n"
" :return: Blend file data which is freed once the context exists.\n"
" :rtype: :class:`bpy.types.BlendData`\n");
static PyObject *bpy_rna_data_temp_data(PyObject *UNUSED(self), PyObject *args, PyObject *kw)
{
BPy_DataContext *ret;
const char *filepath = NULL;
static const char *_keywords[] = {"filepath", NULL};
static _PyArg_Parser _parser = {
"|$" /* Optional keyword only arguments. */
"z" /* `filepath` */
":temp_data",
_keywords,
0,
};
if (!_PyArg_ParseTupleAndKeywordsFast(args, kw, &_parser, &filepath)) {
return NULL;
}
ret = PyObject_GC_New(BPy_DataContext, &bpy_rna_data_context_Type);
STRNCPY(ret->filepath, filepath ? filepath : G_MAIN->filepath);
return (PyObject *)ret;
}
static PyObject *bpy_rna_data_context_enter(BPy_DataContext *self)
{
Main *bmain_temp = BKE_main_new();
PointerRNA ptr;
RNA_pointer_create(NULL, &RNA_BlendData, bmain_temp, &ptr);
self->data_rna = (BPy_StructRNA *)pyrna_struct_CreatePyObject(&ptr);
BLI_assert(!PyObject_GC_IsTracked((PyObject *)self));
PyObject_GC_Track(self);
return (PyObject *)self->data_rna;
}
static PyObject *bpy_rna_data_context_exit(BPy_DataContext *self, PyObject *UNUSED(args))
{
BKE_main_free(self->data_rna->ptr.data);
RNA_POINTER_INVALIDATE(&self->data_rna->ptr);
Py_RETURN_NONE;
}
PyMethodDef BPY_rna_data_context_method_def = {
"temp_data",
(PyCFunction)bpy_rna_data_temp_data,
METH_STATIC | METH_VARARGS | METH_KEYWORDS,
bpy_rna_data_context_load_doc,
};
int BPY_rna_data_context_type_ready(void)
{
if (PyType_Ready(&bpy_rna_data_context_Type) < 0) {
return -1;
}
return 0;
}
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