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 // Python.h needs to be included first.
  23 #include "GUIScript.h"
  24
  25 #include "win32def.h" // For Logging
  26
  27 #include "Callback.h"
  28 #include "Holder.h"
  29 #include "Interface.h"
  30
  31 class StringCallback : public Callback {
  32 public:
  33         StringCallback(const char*);
  34         StringCallback(PyObject*);
  35         ~StringCallback();
  36         bool call();
  37 private:
  38         PyObject* Name;
  39 };
  40
  41 struct PythonCallback : public Callback {
  42 public:
  43         PythonCallback(PyObject *Function);
  44         ~PythonCallback();
  45         bool call();
  46 private:
  47         PyObject *Function;
  48 };
  49
  50
  51 template <typename T>
  52 class CObject : public Holder<T> {
  53 private:
  54 public:
  55         operator PyObject* () const
  56         {
  57                 if (Holder<T>::ptr) {
  58                         Holder<T>::ptr->acquire();
  59                         GUIScript *gs = (GUIScript *) core->GetGUIScriptEngine();
  60                         PyObject *obj = PyCObject_FromVoidPtrAndDesc(Holder<T>::ptr,const_cast<TypeID*>(&T::ID),PyRelease);
  61                         PyObject *tuple = PyTuple_New(1);
  62                         PyTuple_SET_ITEM(tuple, 0, obj);
  63                         return gs->ConstructObject(T::ID.description, tuple);
  64                 } else {
  65                         Py_INCREF( Py_None );
  66                         return Py_None;
  67                 }
  68         }
  69         CObject(PyObject *obj)
  70         {
  71                 if (obj == Py_None)
  72                         return;
  73                 PyObject *id = PyObject_GetAttrString(obj, "ID");
  74                 if (id)
  75                         obj = id;
  76                 else
  77                         PyErr_Clear();
  78                 if (!PyCObject_Check(obj) || PyCObject_GetDesc(obj) != const_cast<TypeID*>(&T::ID)) {
  79                         printMessage("GUIScript","Bad CObject extracted.\n",LIGHT_RED);
  80                         return;
  81                 }
  82                 Holder<T>::ptr = static_cast<T*>(PyCObject_AsVoidPtr(obj));
  83                 Holder<T>::ptr->acquire();
  84                 if (id) {
  85                         Py_DECREF(id);
  86                 }
  87         }
  88         CObject(const Holder<T>& ptr)
  89                 : Holder<T>(ptr)
  90         {
  91         }
  92         // This is here because of lookup order issues.
  93         operator bool () const
  94         {
  95                 return Holder<T>::ptr;
  96         }
  97 private:
  98         static void PyRelease(void *obj, void *desc)
  99         {
 100                 if (desc != const_cast<TypeID*>(&T::ID)) {
 101                         printMessage("GUIScript","Bad CObject deleted.\n",LIGHT_RED);
 102                         return;
 103                 }
 104                 static_cast<T*>(obj)->release();
 105         }
 106 };
 107
 108 template <typename T, class Container>
 109 PyObject* MakePyList(const Container &source)
 110 {
 111         size_t size = source.size();
 112         PyObject *list = PyList_New(size);
 113         for (size_t i = 0; i < size; ++i) {
 114                 // SET_ITEM might be preferable to SetItem here, but MSVC6 doesn't like it.
 115                 PyList_SetItem(list, i, CObject<T>(source[i]));
 116         }
 117         return list;
 118 }
 119
 120 #endif