gemrb/plugins/GUIScript/PythonHelpers.h

   1 /* GemRB - Infinity Engine Emulator
   2  * Copyright (C) 2003 The GemRB Project
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  17  */
  18
  19 #ifndef PYTHON_HELPERS_H
  20 #define PYTHON_HELPERS_H
  21
  22 #include "win32def.h" // For Logging
  23
  24 #include "Holder.h"
  25 #include "Interface.h"
  26
  27 template <typename T>
  28 class CObject : public Holder<T> {
  29 private:
  30 public:
  31         operator PyObject* () const
  32         {
  33                 if (Holder<T>::ptr) {
  34                         Holder<T>::ptr->acquire();
  35                         GUIScript *gs = (GUIScript *) core->GetGUIScriptEngine();
  36                         PyObject *obj = PyCObject_FromVoidPtrAndDesc(Holder<T>::ptr,const_cast<TypeID*>(&T::ID),PyRelease);
  37                         PyObject *tuple = PyTuple_New(1);
  38                         PyTuple_SET_ITEM(tuple, 0, obj);
  39                         return gs->ConstructObject(T::ID.description, tuple);
  40                 } else {
  41                         Py_INCREF( Py_None );
  42                         return Py_None;
  43                 }
  44         }
  45         CObject(PyObject *obj)
  46         {
  47                 if (obj == Py_None)
  48                         return;
  49                 PyObject *id = PyObject_GetAttrString(obj, "ID");
  50                 if (id)
  51                         obj = id;
  52                 else
  53                         PyErr_Clear();
  54                 if (!PyCObject_Check(obj) || PyCObject_GetDesc(obj) != const_cast<TypeID*>(&T::ID)) {
  55                         printMessage("GUIScript","Bad CObject extracted.\n",LIGHT_RED);
  56                         return;
  57                 }
  58                 Holder<T>::ptr = static_cast<T*>(PyCObject_AsVoidPtr(obj));
  59                 Holder<T>::ptr->acquire();
  60                 if (id) {
  61                         Py_DECREF(id);
  62                 }
  63         }
  64         CObject(const Holder<T>& ptr)
  65                 : Holder<T>(ptr)
  66         {
  67         }
  68         // This is here because of lookup order issues.
  69         operator bool () const
  70         {
  71                 return Holder<T>::ptr;
  72         }
  73 private:
  74         static void PyRelease(void *obj, void *desc)
  75         {
  76                 if (desc != const_cast<TypeID*>(&T::ID)) {
  77                         printMessage("GUIScript","Bad CObject deleted.\n",LIGHT_RED);
  78                         return;
  79                 }
  80                 static_cast<T*>(obj)->release();
  81         }
  82 };
  83
  84 template <typename T, class Container>
  85 PyObject* MakePyList(const Container &source)
  86 {
  87         size_t size = source.size();
  88         PyObject *list = PyList_New(size);
  89         for (size_t i = 0; i < size; ++i) {
  90                 // SET_ITEM might be preferable to SetItem here, but MSVC6 doesn't like it.
  91                 PyList_SetItem(list, i, CObject<T>(source[i]));
  92         }
  93         return list;
  94 }
  95
  96 #endif