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// Copyright (C) 2025 Ford Motor Company
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "pysidecapsulemethod_p.h"
extern "C"
{
// This struct is used for both CapsuleMethod and CapsuleProperty
struct CapsuleDescriptor
{
PyTypeObject base;
PyObject *capsule;
PyMethodDef methodDef;
void configure(PyObject *capsule, PyMethodDef *method)
{
this->capsule = capsule;
Py_INCREF(capsule);
// We make a copy of the input name and doc strings so they can be temporary on
// the input.
if (method->ml_name)
methodDef.ml_name = strdup(method->ml_name);
if (method->ml_doc)
methodDef.ml_doc = strdup(method->ml_doc);
methodDef.ml_meth = method->ml_meth;
methodDef.ml_flags = method->ml_flags;
}
};
static PyObject *CapsuleDescriptor_tp_new(PyTypeObject *type, PyObject * /* args */, PyObject * /* kwds */);
static void CapsuleDescriptor_free(PyObject *self);
static PyObject *CapsuleMethod_descr_get(PyObject *self, PyObject *instance, PyObject * /* owner */);
static PyObject *CapsuleProperty_descr_get(PyObject *self, PyObject *instance, PyObject * /* owner */);
static int CapsuleProperty_descr_set(PyObject *self, PyObject *instance, PyObject * /* owner */);
/**
* We are creating two related types, CapsuleMethod and CapsuleProperty, that are
* used to enable lambda-like behavior. The difference is in usage, where
* CapsuleMethod's __get__ function returns a Callable (i.e., method-like usage:
* obj.capsuleMethodName(args)) and only supports the __get__ method.
* CapsuleProperty on the other hand is used for properties, and supports both
* __get__ and __set__ methods (i.e., obj.capsulePropertyName = value or val =
* obj.capsulePropertyName).
*/
static PyTypeObject *createCapsuleMethodType()
{
PyType_Slot CapsuleMethodType_slots[] = {
{Py_tp_new, reinterpret_cast<void *>(CapsuleDescriptor_tp_new)},
{Py_tp_descr_get, reinterpret_cast<void *>(CapsuleMethod_descr_get)},
{Py_tp_free, reinterpret_cast<void *>(CapsuleDescriptor_free)},
{0, nullptr}
};
PyType_Spec CapsuleMethodType_spec = {
"2:PySide6.QtRemoteObjects.CapsuleMethod",
sizeof(CapsuleDescriptor),
0,
Py_TPFLAGS_DEFAULT,
CapsuleMethodType_slots};
PyObject *type = PyType_FromSpec(&CapsuleMethodType_spec);
if (!type) {
PyErr_Print();
return nullptr;
}
return reinterpret_cast<PyTypeObject*>(type);
}
PyTypeObject *CapsuleMethod_TypeF(void)
{
static auto *type = createCapsuleMethodType();
return type;
}
static PyTypeObject *createCapsulePropertyType(bool isWritable)
{
PyType_Slot WritablePropertyType_slots[] = {
{Py_tp_new, reinterpret_cast<void *>(CapsuleDescriptor_tp_new)},
{Py_tp_descr_get, reinterpret_cast<void *>(CapsuleProperty_descr_get)},
{Py_tp_descr_set, reinterpret_cast<void *>(CapsuleProperty_descr_set)},
{Py_tp_free, reinterpret_cast<void *>(CapsuleDescriptor_free)},
{0, nullptr}
};
PyType_Slot ReadOnlyPropertyType_slots[] = {
{Py_tp_new, reinterpret_cast<void *>(CapsuleDescriptor_tp_new)},
{Py_tp_descr_get, reinterpret_cast<void *>(CapsuleProperty_descr_get)},
{Py_tp_free, reinterpret_cast<void *>(CapsuleDescriptor_free)},
{0, nullptr}
};
PyType_Spec CapsulePropertyType_spec = {
"2:PySide6.QtRemoteObjects.CapsuleProperty",
sizeof(CapsuleDescriptor),
0,
Py_TPFLAGS_DEFAULT,
isWritable ? WritablePropertyType_slots : ReadOnlyPropertyType_slots};
PyObject *type = PyType_FromSpec(&CapsulePropertyType_spec);
if (!type) {
PyErr_Print();
return nullptr;
}
return reinterpret_cast<PyTypeObject*>(type);
}
PyTypeObject *CapsuleProperty_TypeF(bool isWritable=false)
{
if (isWritable) {
static auto *type = createCapsulePropertyType(true);
return type;
}
static auto *type = createCapsulePropertyType(false);
return type;
}
static PyObject *CapsuleDescriptor_tp_new(PyTypeObject *type, PyObject * /* args */, PyObject * /* kwds */)
{
auto *self = reinterpret_cast<CapsuleDescriptor *>(PyType_GenericAlloc(type, 0));
if (self != nullptr) {
self->capsule = nullptr;
self->methodDef = {nullptr, nullptr, METH_NOARGS, nullptr}; // Initialize methodDef
}
return reinterpret_cast<PyObject *>(self);
}
static void CapsuleDescriptor_free(PyObject *self)
{
auto *d = reinterpret_cast<CapsuleDescriptor *>(self);
Py_XDECREF(d->capsule);
free(const_cast<char*>(d->methodDef.ml_name));
free(const_cast<char*>(d->methodDef.ml_doc));
}
static PyObject *CapsuleMethod_descr_get(PyObject *self, PyObject *instance, PyObject * /* owner */)
{
if (instance == nullptr) {
// Return the descriptor object if accessed from the class
Py_INCREF(self);
return self;
}
auto *d = reinterpret_cast<CapsuleDescriptor *>(self);
CapsuleDescriptorData *data = new CapsuleDescriptorData{instance, d->capsule};
PyObject *payload = PyCapsule_New(data, "Payload", [](PyObject *capsule) {
delete reinterpret_cast<CapsuleDescriptorData *>(PyCapsule_GetPointer(capsule, "Payload"));
});
if (!payload)
return nullptr;
Py_INCREF(payload);
return PyCFunction_New(&d->methodDef, payload);
}
bool add_capsule_method_to_type(PyTypeObject *type, PyMethodDef *method, PyObject *capsule)
{
if (PyType_Ready(type) < 0) {
PyErr_Print();
return false;
}
auto *descriptor = reinterpret_cast<CapsuleDescriptor *>(
PyObject_CallObject(reinterpret_cast<PyObject *>(CapsuleMethod_TypeF()), nullptr));
if (!descriptor) {
PyErr_Print();
return false;
}
descriptor->configure(capsule, method);
auto *descr = reinterpret_cast<PyObject *>(descriptor);
if (PyObject_SetAttrString(reinterpret_cast<PyObject *>(type), method->ml_name, descr) < 0) {
PyErr_Print();
return false;
}
return true;
}
static PyObject *CapsuleProperty_descr_get(PyObject *self, PyObject *instance, PyObject * /* owner */)
{
if (instance == nullptr) {
// Return the descriptor object if accessed from the class
Py_INCREF(self);
return self;
}
auto *d = reinterpret_cast<CapsuleDescriptor *>(self);
CapsuleDescriptorData *data = new CapsuleDescriptorData{instance, d->capsule};
PyObject *payload = PyCapsule_New(data, "Payload", [](PyObject *capsule) {
delete reinterpret_cast<CapsuleDescriptorData *>(PyCapsule_GetPointer(capsule, "Payload"));
});
if (!payload)
return nullptr;
return PyObject_CallFunctionObjArgs(PyCFunction_New(&d->methodDef, payload), nullptr);
}
static int CapsuleProperty_descr_set(PyObject *self, PyObject *instance, PyObject *value)
{
auto *d = reinterpret_cast<CapsuleDescriptor *>(self);
CapsuleDescriptorData *data = new CapsuleDescriptorData{instance, d->capsule};
PyObject *payload = PyCapsule_New(data, "Payload", [](PyObject *capsule) {
delete reinterpret_cast<CapsuleDescriptorData *>(PyCapsule_GetPointer(capsule, "Payload"));
});
if (!payload)
return -1;
Py_INCREF(payload);
PyObject *result = PyObject_CallFunctionObjArgs(PyCFunction_New(&d->methodDef, payload),
value, nullptr);
if (!result)
return -1;
Py_DECREF(result);
return 0;
}
// Returns a new CapsuleProperty descriptor object for use with PySideProperty
PyObject *make_capsule_property(PyMethodDef *method, PyObject *capsule, bool isWritable)
{
auto *type = CapsuleProperty_TypeF(isWritable);
auto *descriptor = PyObject_CallObject(reinterpret_cast<PyObject *>(type), nullptr);
if (!descriptor)
return nullptr;
reinterpret_cast<CapsuleDescriptor*>(descriptor)->configure(capsule, method);
return descriptor;
}
} // extern "C"
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