summaryrefslogtreecommitdiffstats
path: root/sources/pyside2/libpyside/pysidemetafunction.cpp
blob: 3461172013666506c0fb706ddd3fe3075b770dfa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt for Python.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "pysidemetafunction.h"
#include "pysidemetafunction_p.h"

#include <shiboken.h>

#include <QtCore/QMetaMethod>

extern "C"
{

struct PySideMetaFunctionPrivate
{
    QObject *qobject;
    int methodIndex;
};

//methods
static void functionFree(void *);
static PyObject *functionCall(PyObject *, PyObject *, PyObject *);

static PyType_Slot PySideMetaFunctionType_slots[] = {
    {Py_tp_call, (void *)functionCall},
    {Py_tp_new, (void *)PyType_GenericNew},
    {Py_tp_free, (void *)functionFree},
    {Py_tp_dealloc, (void *)object_dealloc},
    {0, 0}
};
static PyType_Spec PySideMetaFunctionType_spec = {
    "PySide.MetaFunction",
    sizeof(PySideMetaFunction),
    0,
    Py_TPFLAGS_DEFAULT,
    PySideMetaFunctionType_slots,
};


PyTypeObject *PySideMetaFunctionTypeF(void)
{
    static PyTypeObject *type = nullptr;
    if (!type)
        type = (PyTypeObject *)PyType_FromSpec(&PySideMetaFunctionType_spec);
    return type;
}

void functionFree(void *self)
{
    PySideMetaFunction *function = reinterpret_cast<PySideMetaFunction *>(self);
    delete function->d;
}

PyObject *functionCall(PyObject *self, PyObject *args, PyObject * /* kw */)
{
    PySideMetaFunction *function = reinterpret_cast<PySideMetaFunction *>(self);

    PyObject *retVal;
    if (!PySide::MetaFunction::call(function->d->qobject, function->d->methodIndex, args, &retVal))
        return 0;
    return retVal;
}

} // extern "C"

namespace PySide { namespace MetaFunction {

void init(PyObject *module)
{
    if (PyType_Ready(PySideMetaFunctionTypeF()) < 0)
        return;

    PyModule_AddObject(module, "MetaFunction", reinterpret_cast<PyObject *>(PySideMetaFunctionTypeF()));
}

PySideMetaFunction *newObject(QObject *source, int methodIndex)
{
    if (methodIndex >= source->metaObject()->methodCount())
        return 0;

    QMetaMethod method = source->metaObject()->method(methodIndex);
    if ((method.methodType() == QMetaMethod::Slot) ||
        (method.methodType() == QMetaMethod::Method)) {
        PySideMetaFunction *function = PyObject_New(PySideMetaFunction, PySideMetaFunctionTypeF());
        function->d = new PySideMetaFunctionPrivate();
        function->d->qobject = source;
        function->d->methodIndex = methodIndex;
        return function;
    }
    return 0;
}

bool call(QObject *self, int methodIndex, PyObject *args, PyObject **retVal)
{

    QMetaMethod method = self->metaObject()->method(methodIndex);
    QList<QByteArray> argTypes = method.parameterTypes();

    // args given plus return type
    Shiboken::AutoDecRef sequence(PySequence_Fast(args, 0));
    int numArgs = PySequence_Fast_GET_SIZE(sequence.object()) + 1;

    if (numArgs - 1 > argTypes.count()) {
        PyErr_Format(PyExc_TypeError, "%s only accepts %d argument(s), %d given!",
                     method.methodSignature().constData(),
                     argTypes.count(), numArgs - 1);
        return false;
    }

    if (numArgs - 1 < argTypes.count()) {
        PyErr_Format(PyExc_TypeError, "%s needs %d argument(s), %d given!",
                     method.methodSignature().constData(),
                     argTypes.count(), numArgs - 1);
        return false;
    }

    QVariant *methValues = new QVariant[numArgs];
    void **methArgs = new void *[numArgs];

    // Prepare room for return type
    const char *returnType = method.typeName();
    if (returnType && std::strcmp("void", returnType))
        argTypes.prepend(returnType);
    else
        argTypes.prepend(QByteArray());

    int i;
    for (i = 0; i < numArgs; ++i) {
        const QByteArray &typeName = argTypes.at(i);
        // This must happen only when the method hasn't return type.
        if (typeName.isEmpty()) {
            methArgs[i] = 0;
            continue;
        }

        Shiboken::Conversions::SpecificConverter converter(typeName);
        if (converter) {
            int typeId = QMetaType::type(typeName);
            if (!Shiboken::Conversions::pythonTypeIsObjectType(converter)) {
                if (!typeId) {
                    PyErr_Format(PyExc_TypeError, "Value types used on meta functions (including signals) need to be "
                                                  "registered on meta type: %s", typeName.data());
                    break;
                }
                methValues[i] = QVariant(typeId, static_cast<const void *>(0));
            }
            methArgs[i] = methValues[i].data();
            if (i == 0) // Don't do this for return type
                continue;
            if (typeId == QVariant::String) {
                QString tmp;
                converter.toCpp(PySequence_Fast_GET_ITEM(sequence.object(), i - 1), &tmp);
                methValues[i] = tmp;
            } else {
                converter.toCpp(PySequence_Fast_GET_ITEM(sequence.object(), i - 1), methArgs[i]);
            }
        } else {
            PyErr_Format(PyExc_TypeError, "Unknown type used to call meta function (that may be a signal): %s", argTypes[i].constData());
            break;
        }
    }

    bool ok = i == numArgs;
    if (ok) {
        Py_BEGIN_ALLOW_THREADS
        QMetaObject::metacall(self, QMetaObject::InvokeMetaMethod, method.methodIndex(), methArgs);
        Py_END_ALLOW_THREADS

        if (retVal) {
            if (methArgs[0]) {
                static SbkConverter *qVariantTypeConverter = Shiboken::Conversions::getConverter("QVariant");
                Q_ASSERT(qVariantTypeConverter);
                *retVal = Shiboken::Conversions::copyToPython(qVariantTypeConverter, &methValues[0]);
            } else {
                *retVal = Py_None;
                Py_INCREF(*retVal);
            }
        }
    }

    delete[] methArgs;
    delete[] methValues;

    return ok;
}


} //namespace MetaFunction
} //namespace PySide