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
|
/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Contributor(s): Porteries Tristan.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file gameengine/Expressions/KX_PythonCallBack.cpp
* \ingroup expressions
*/
#include "KX_PythonCallBack.h"
#include <iostream>
#include <stdarg.h>
#include "BLI_alloca.h"
/** Check if a python value is a function and have the correct number of arguments.
* \param value The python value to check.
* \param minargcount The minimum of arguments possible.
* \param maxargcount The maximum of arguments possible.
* \param r_argcount The number of argument of this function, this variable will be
* changed in the function.
*/
static PyObject *CheckPythonFunction(PyObject *value, unsigned int minargcount, unsigned int maxargcount, unsigned int &r_argcount)
{
if (PyMethod_Check(value)) {
PyCodeObject *code = ((PyCodeObject *)PyFunction_GET_CODE(PyMethod_GET_FUNCTION(value)));
// *args support
r_argcount = (code->co_flags & CO_VARARGS) ? maxargcount : (code->co_argcount - 1);
}
else if (PyFunction_Check(value)) {
PyCodeObject *code = ((PyCodeObject *)PyFunction_GET_CODE(value));
// *args support
r_argcount = (code->co_flags & CO_VARARGS) ? maxargcount : code->co_argcount;
}
else { // is not a methode or a function
PyErr_Format(PyExc_TypeError, "items must be functions or methodes, not %s",
Py_TYPE(value)->tp_name);
return NULL;
}
if (r_argcount < minargcount || r_argcount > maxargcount) {
// wrong number of arguments
PyErr_Format(PyExc_TypeError, "methode or function (%s) has invalid number of arguments (%i) must be between %i and %i",
Py_TYPE(value)->tp_name, r_argcount, minargcount, maxargcount);
return NULL;
}
return value;
}
/** Create a python tuple to call a python function
* \param argcount The lenght of the tuple.
* \param arglist The fully list of python arguments [size >= argcount].
*/
static PyObject *CreatePythonTuple(unsigned int argcount, PyObject **arglist)
{
PyObject *tuple = PyTuple_New(argcount);
for (unsigned int i = 0; i < argcount; ++i) {
PyObject *item = arglist[i];
// increment reference and copy it in a new tuple
Py_INCREF(item);
PyTuple_SET_ITEM(tuple, i, item);
}
return tuple;
}
void RunPythonCallBackList(PyObject *functionlist, PyObject **arglist, unsigned int minargcount, unsigned int maxargcount)
{
unsigned int size = PyList_Size(functionlist);
PyObject **argTuples = (PyObject **)BLI_array_alloca(argTuples, maxargcount - minargcount + 1);
memset(argTuples, 0, sizeof(PyObject *) * (maxargcount - minargcount + 1));
for (unsigned int i = 0; i < size; ++i) {
unsigned int funcargcount = 0;
PyObject *item = PyList_GET_ITEM(functionlist, i);
PyObject *func = CheckPythonFunction(item, minargcount, maxargcount, funcargcount);
if (!func) { // this item fails the check
PyErr_Print();
PyErr_Clear();
continue;
}
// get correct argument tuple.
PyObject *tuple = argTuples[funcargcount - minargcount];
if (!tuple)
argTuples[funcargcount - minargcount] = tuple = CreatePythonTuple(funcargcount, arglist);
PyObject *ret = PyObject_Call(func, tuple, NULL);
if (!ret) { // if ret is NULL this seems that the function doesn't work !
PyErr_Print();
PyErr_Clear();
}
else
Py_DECREF(ret);
}
for (unsigned int i = 0; i <= (maxargcount - minargcount); ++i)
Py_XDECREF(argTuples[i]);
}
|
