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// This is the implementation of the pyqtSlot decorator.
//
// Copyright (c) 2018 Riverbank Computing Limited <info@riverbankcomputing.com>
//
// This file is part of PyQt5.
//
// This file may be used under the terms of the GNU General Public License
// version 3.0 as published by the Free Software Foundation and appearing in
// the file LICENSE included in the packaging of this file. Please review the
// following information to ensure the GNU General Public License version 3.0
// requirements will be met: http://www.gnu.org/copyleft/gpl.html.
//
// If you do not wish to use this file under the terms of the GPL version 3.0
// then you may purchase a commercial license. For more information contact
// info@riverbankcomputing.com.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
#include <Python.h>
#include <QByteArray>
#include "qpycore_api.h"
#include "qpycore_chimera.h"
#include "qpycore_misc.h"
#include "qpycore_objectified_strings.h"
// Forward declarations.
extern "C" {static PyObject *decorator(PyObject *self, PyObject *f);}
// This implements the pyqtSlot decorator.
PyObject *qpycore_pyqtslot(PyObject *args, PyObject *kwds)
{
const char *name_str = 0;
PyObject *res_obj = 0;
int revision = 0;
static const char *kwlist[] = {"name", "result", "revision", 0};
static PyObject *no_args = 0;
if (!no_args)
{
no_args = PyTuple_New(0);
if (!no_args)
return 0;
}
if (!PyArg_ParseTupleAndKeywords(no_args, kwds, "|sOi:pyqtSlot",
const_cast<char **>(kwlist), &name_str, &res_obj, &revision))
return 0;
Chimera::Signature *parsed_sig = Chimera::parse(args, name_str,
"a pyqtSlot type argument");
if (!parsed_sig)
return 0;
// Sticking the revision here is an awful hack, but it saves creating
// another data structure wrapped in a capsule.
parsed_sig->revision = revision;
// Parse any result type.
if (res_obj)
{
parsed_sig->result = Chimera::parse(res_obj);
if (!parsed_sig->result)
{
Chimera::raiseParseException(res_obj, "a pyqtSlot result");
delete parsed_sig;
return 0;
}
}
// Wrap the parsed signature in a Python object.
PyObject *sig_obj = Chimera::Signature::toPyObject(parsed_sig);
if (!sig_obj)
return 0;
// Create the decorator function itself. We stash the arguments in "self".
// This may be an abuse, but it seems to be Ok.
static PyMethodDef deco_method = {
#if PY_VERSION_HEX >= 0x02050000
"_deco", decorator, METH_O, 0
#else
const_cast<char *>("_deco"), decorator, METH_O, 0
#endif
};
PyObject *obj = PyCFunction_New(&deco_method, sig_obj);
Py_DECREF(sig_obj);
return obj;
}
// This is the decorator function that saves the C++ signature as a function
// attribute.
static PyObject *decorator(PyObject *self, PyObject *f)
{
Chimera::Signature *parsed_sig = Chimera::Signature::fromPyObject(self);
const QByteArray &sig = parsed_sig->signature;
// Use the function name if there isn't already one.
if (sig.startsWith('('))
{
// Get the function's name.
PyObject *nobj = PyObject_GetAttr(f, qpycore_dunder_name);
if (!nobj)
return 0;
PyObject *ascii_obj = nobj;
const char *ascii = sipString_AsASCIIString(&ascii_obj);
Py_DECREF(nobj);
if (!ascii)
return 0;
parsed_sig->signature.prepend(ascii);
parsed_sig->py_signature.prepend(ascii);
Py_DECREF(ascii_obj);
}
// See if the function has already been decorated.
PyObject *decorations = PyObject_GetAttr(f, qpycore_dunder_pyqtsignature);
int rc;
if (decorations)
{
// Insert the new decoration at the head of the existing ones so that
// the list order matches the order they appear in the script.
rc = PyList_Insert(decorations, 0, self);
}
else
{
PyErr_Clear();
decorations = PyList_New(1);
if (!decorations)
return 0;
Py_INCREF(self);
PyList_SetItem(decorations, 0, self);
// Save the new decoration.
rc = PyObject_SetAttr(f, qpycore_dunder_pyqtsignature, decorations);
}
Py_DECREF(decorations);
if (rc < 0)
return 0;
// Return the function.
Py_INCREF(f);
return f;
}
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