PythonQtConversion.cpp

/*
*
*  Copyright (C) 2006 MeVis Research GmbH All Rights Reserved.
*
*  This library is free software; you can redistribute it and/or
*  modify it under the terms of the GNU Lesser General Public
*  License as published by the Free Software Foundation; either
*  version 2.1 of the License, or (at your option) any later version.
*
*  This library 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
*  Lesser General Public License for more details.
*
*  Further, this software is distributed without any warranty that it is
*  free of the rightful claim of any third person regarding infringement
*  or the like.  Any license provided herein, whether implied or
*  otherwise, applies only to this software file.  Patent licenses, if
*  any, provided herein do not apply to combinations of this program with
*  other software, or any other product whatsoever.
*
*  You should have received a copy of the GNU Lesser General Public
*  License along with this library; if not, write to the Free Software
*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
*  Contact information: MeVis Research GmbH, Universitaetsallee 29,
*  28359 Bremen, Germany or:
*
*  http://www.mevis.de
*
*/

//----------------------------------------------------------------------------------
/*!
// \file    PythonQtConversion.cpp
// \author  Florian Link
// \author  Last changed by $Author: florian $
// \date    2006-05
*/
//----------------------------------------------------------------------------------

#include "PythonQtConversion.h"
#include "PythonQtVariants.h"
#include "PythonQtVariantWrapper.h"
#include <QDateTime>
#include <QTime>
#include <QDate>

PythonQtValueStorage<qint64, 128>  PythonQtConv::global_valueStorage;
PythonQtValueStorage<void*, 128>   PythonQtConv::global_ptrStorage;
PythonQtValueStorage<QVariant, 32> PythonQtConv::global_variantStorage;


PyObject* PythonQtConv::GetPyBool(bool val)
{
  PyObject* r = val?Py_True:Py_False;
  Py_INCREF(r);
  return r;
}

PyObject* PythonQtConv::ConvertQtValueToPython(const PythonQtMethodInfo::ParameterInfo& info, void* data) {
  if (info.typeId == QMetaType::Void) {
    Py_INCREF(Py_None);
    return Py_None;
  } else {
    if (info.isPointer && (info.typeId == PythonQtMethodInfo::Unknown)) {
      // convert argList[0] to python
      PyObject* pyObj = PythonQt::priv()->wrapPtr(*((void**)data), info.name);
      if (pyObj) {
        return pyObj;
      } else {
        std::cerr << "unknown pointer type " << info.name.data() << ", in " << __FILE__ << ":" << __LINE__ << std::endl;
        Py_INCREF(Py_None);
        return Py_None;
      }
    } else if (info.isPointer && (info.typeId == QMetaType::Char)) {
      // a char ptr will probably be a null terminated string, so we support that:
      return PyString_FromString(*((char**)data));
    } else {
      // handle values that are not pointers
      return ConvertQtValueToPythonInternal(info.typeId, data);
    }
  }
}

PyObject* PythonQtConv::ConvertQtValueToPythonInternal(int type, void* data) {
  switch (type) {
  case QMetaType::Void:
    Py_INCREF(Py_None);
    return Py_None;
  case QMetaType::Char:
    return PyInt_FromLong(*((char*)data));
  case QMetaType::UChar:
    return PyInt_FromLong(*((unsigned char*)data));
  case QMetaType::Short:
    return PyInt_FromLong(*((short*)data));
  case QMetaType::UShort:
    return PyInt_FromLong(*((unsigned short*)data));
  case QMetaType::Long:
    return PyInt_FromLong(*((long*)data));
  case QMetaType::ULong:
    // does not fit into simple int of python
    return PyLong_FromUnsignedLong(*((unsigned long*)data));
  case QMetaType::Bool:
    return PythonQtConv::GetPyBool(*((bool*)data));
  case QMetaType::Int:
    return PyInt_FromLong(*((int*)data));
  case QMetaType::UInt:
    return PyInt_FromLong(*((unsigned int*)data));
  case QMetaType::QChar:
    return PyInt_FromLong(*((short*)data));
  case QMetaType::Float:
    return PyFloat_FromDouble(*((float*)data));
  case QMetaType::Double:
    return PyFloat_FromDouble(*((double*)data));
  case QMetaType::LongLong:
    return PyLong_FromLongLong(*((qint64*)data));
  case QMetaType::ULongLong:
    return PyLong_FromUnsignedLongLong(*((quint64*)data));
  case QMetaType::QByteArray:
    return PyString_FromString(*((QByteArray*)data));
  case QMetaType::QVariantMap:
    return PythonQtConv::QVariantMapToPyObject(*((QVariantMap*)data));
  case QMetaType::QVariantList:
    return PythonQtConv::QVariantListToPyObject(*((QVariantList*)data));
  case QMetaType::QString:
    return PythonQtConv::QStringToPyObject(*((QString*)data));
  case QMetaType::QStringList:
    return PythonQtConv::QStringListToPyObject(*((QStringList*)data));
    
  case PythonQtMethodInfo::Variant:
    return PythonQtConv::QVariantToPyObject(*((QVariant*)data));
  case QMetaType::QObjectStar:
  case QMetaType::QWidgetStar:
    return PythonQt::priv()->wrapQObject(*((QObject**)data));

  // the following cases could be handled by the default case, but it is faster to do it with
  // direct casts:
  case QMetaType::QDate:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QDate*)data)));
  case QMetaType::QTime:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QTime*)data)));
  case QMetaType::QDateTime:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QDateTime*)data)));
  case QMetaType::QRect:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QRect*)data)));
  case QMetaType::QSize:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QSize*)data)));
  case QMetaType::QPoint:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QPoint*)data)));
  case QMetaType::QColor:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QColor*)data)));
  case QMetaType::QPixmap:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QPixmap*)data)));
  case QMetaType::QUrl:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QUrl*)data)));
  case QMetaType::QRectF:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QRectF*)data)));
  case QMetaType::QSizeF:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QSizeF*)data)));
  case QMetaType::QLine:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QLine*)data)));
  case QMetaType::QLineF:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QLineF*)data)));
  case QMetaType::QPointF:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QPointF*)data)));
  case QMetaType::QRegExp:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QRegExp*)data)));
  case QMetaType::QBitArray:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QBitArray*)data)));
  case QMetaType::QLocale:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QLocale*)data)));
  case QMetaType::QFont:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QFont*)data)));
  case QMetaType::QBrush:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QBrush*)data)));
  case QMetaType::QPalette:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QPalette*)data)));
  case QMetaType::QIcon:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(qVariantFromValue(*((QIcon*)data)));
  case QMetaType::QImage:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QImage*)data)));
  case QMetaType::QPolygon:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QPolygon*)data)));
  case QMetaType::QRegion:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QRegion*)data)));
  case QMetaType::QBitmap:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(qVariantFromValue(*((QBitmap*)data)));
  case QMetaType::QCursor:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QCursor*)data)));
  case QMetaType::QSizePolicy:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(QVariant(*((QSizePolicy*)data)));
  case QMetaType::QKeySequence:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(qVariantFromValue(*((QKeySequence*)data)));
  case QMetaType::QPen:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(qVariantFromValue(*((QPen*)data)));
  case QMetaType::QTextLength:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(qVariantFromValue(*((QTextLength*)data)));
  case QMetaType::QTextFormat:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(qVariantFromValue(*((QTextFormat*)data)));
  case QMetaType::QMatrix:
    return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(qVariantFromValue(*((QMatrix*)data)));
  default:
    if (PythonQt::priv()->isPythonQtObjectPtrMetaId(type)) {
      PyObject* o = ((PythonQtObjectPtr*)data)->object();
      Py_INCREF(o);
      return o;
    } else {
      QVariant v(type, data);
      if (v.isValid()) {
        return (PyObject*)PythonQt::priv()->createNewPythonQtVariantWrapper(v);
      } else {
        std::cerr << "Unknown type that can not be converted to Python: " << type << ", in " << __FILE__ << ":" << __LINE__ << std::endl;
      }
    }
}
Py_INCREF(Py_None);
return Py_None;
 }
 
 void* PythonQtConv::CreateQtReturnValue(const PythonQtMethodInfo::ParameterInfo& info) {
   void* ptr = NULL;
   if (info.isPointer) {
     PythonQtValueStorage_ADD_VALUE(global_ptrStorage, void*, NULL, ptr);
   } else {
     switch (info.typeId) {
     case QMetaType::Char:
     case QMetaType::UChar:
     case QMetaType::Short:
     case QMetaType::UShort:
     case QMetaType::Long:
     case QMetaType::ULong:
     case QMetaType::Bool:
     case QMetaType::Int:
     case QMetaType::UInt:
     case QMetaType::QChar:
     case QMetaType::Float:
     case QMetaType::Double:
       PythonQtValueStorage_ADD_VALUE(global_valueStorage, long, 0, ptr);
       break;
     case PythonQtMethodInfo::Variant:
       PythonQtValueStorage_ADD_VALUE(global_variantStorage, QVariant, 0, ptr);
       // return the ptr to the variant
       break;
     default:
       // everything else is stored in a QVariant...
       PythonQtValueStorage_ADD_VALUE(global_variantStorage, QVariant, QVariant::Type(info.typeId), ptr);
       // return the constData pointer that will be filled with the result value later on
       ptr = (void*)((QVariant*)ptr)->constData();
     }
   }
   return ptr;
 }
 
 void* PythonQtConv::ConvertPythonToQt(const PythonQtMethodInfo::ParameterInfo& info, PyObject* obj, bool strict, const QMetaObject* meta)
 {
   bool ok;
   void* ptr = NULL;
   if (info.isPointer) {
     if (obj->ob_type == &PythonQtWrapper_Type) {
       PythonQtWrapper* wrap = (PythonQtWrapper*)obj;
       // c++ wrapper, check if the class names of the c++ objects match
       if (wrap->_info->isCPPWrapper()) {
         //TODO: we could support inheritance on cpp wrappers as well
         if (wrap->_info->wrappedCPPClassName() == info.name) {
           PythonQtValueStorage_ADD_VALUE(global_ptrStorage, void*, wrap->_wrappedPtr, ptr);
         } else {
           // not matching
         }
       } else {
         if (wrap->_info->inherits(info.name)) {
           PythonQtValueStorage_ADD_VALUE(global_ptrStorage, void*, wrap->_obj, ptr);
         } else {
           // not matching
         }
       }
     } else
       if (info.typeId == QMetaType::Char || info.typeId == QMetaType::UChar) {
         QString str = PyObjGetString(obj, strict, ok);
         if (ok) {
           void* ptr2 = NULL;
           PythonQtValueStorage_ADD_VALUE(global_variantStorage, QVariant, QVariant(str.toUtf8()), ptr2);
           PythonQtValueStorage_ADD_VALUE(global_ptrStorage, void*, (((QByteArray*)((QVariant*)ptr2)->constData())->data()), ptr);
         }
       } else if (info.name == "PyObject") {
         // handle low level PyObject directly
         PythonQtValueStorage_ADD_VALUE(global_ptrStorage, void*, obj, ptr);
       } else if (obj == Py_None) {
         // None is treated as a NULL ptr
         PythonQtValueStorage_ADD_VALUE(global_ptrStorage, void*, NULL, ptr);
       } else {
         // if we are not strict, we try if we are passed a 0 integer
         if (!strict) {
           bool ok;
           int value = PyObjGetInt(obj, true, ok);
           if (ok && value==0) {
             PythonQtValueStorage_ADD_VALUE(global_ptrStorage, void*, NULL, ptr);
           }
         }
         // EXTRA: we could support pointers to other simple types, but this would not make sense in most situations
       }
       
   } else {
     // not a pointer
     switch (info.typeId) {
     case QMetaType::Char:
       {
         int val = PyObjGetInt(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, char, val, ptr);
         }
       }
       break;
     case QMetaType::UChar:
       {
         int val = PyObjGetInt(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, unsigned char, val, ptr);
         }
       }
       break;
     case QMetaType::Short:
       {
         int val = PyObjGetInt(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, short, val, ptr);
         }
       }
       break;
     case QMetaType::UShort:
       {
         int val = PyObjGetInt(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, unsigned short, val, ptr);
         }
       }
       break;
     case QMetaType::Long:
       {
         long val = (long)PyObjGetLongLong(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, long, val, ptr);
         }
       }
       break;
     case QMetaType::ULong:
       {
         unsigned long val = (unsigned long)PyObjGetLongLong(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, unsigned long, val, ptr);
         }
       }
       break;
     case QMetaType::Bool:
       {
         bool val = PyObjGetBool(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, bool, val, ptr);
         }
       }
       break;
     case QMetaType::Int:
       {
         int val = PyObjGetInt(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, int, val, ptr);
         }
       }
       break;
     case QMetaType::UInt:
       {
         unsigned int val = (unsigned int)PyObjGetLongLong(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, unsigned int, val, ptr);
         }
       }
       break;
     case QMetaType::QChar:
       {
         int val = PyObjGetInt(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, short, val, ptr);
         }
       }
       break;
     case QMetaType::Float:
       {
         float val = (float)PyObjGetDouble(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, float, val, ptr);
         }
       }
       break;
     case QMetaType::Double:
       {
         double val = (double)PyObjGetDouble(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, double, val, ptr);
         }
       }
       break;
     case QMetaType::LongLong:
       {
         qint64 val = PyObjGetLongLong(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, qint64, val, ptr);
         }
       }
       break;
     case QMetaType::ULongLong:
       {
         quint64 val = PyObjGetULongLong(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_valueStorage, quint64, val, ptr);
         }
       }
       break;
     case QMetaType::QByteArray:
       {
         QString str = PyObjGetString(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_variantStorage, QVariant, QVariant(str.toUtf8()), ptr);
           ptr = (void*)((QVariant*)ptr)->constData();
         }
       }
       break;
     case QMetaType::QString:
       {
         QString str = PyObjGetString(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_variantStorage, QVariant, QVariant(str), ptr);
           ptr = (void*)((QVariant*)ptr)->constData();
         }
       }
       break;
     case QMetaType::QStringList:
       {
         QStringList l = PyObjToStringList(obj, strict, ok);
         if (ok) {
           PythonQtValueStorage_ADD_VALUE(global_variantStorage, QVariant, QVariant(l), ptr);
           ptr = (void*)((QVariant*)ptr)->constData();
         }
       }
       break;
       
     case PythonQtMethodInfo::Variant:
       {
         QVariant v = PyObjToQVariant(obj);
         if (v.isValid()) {
           PythonQtValueStorage_ADD_VALUE(global_variantStorage, QVariant, v, ptr);
         }
       }
       break;
     case PythonQtMethodInfo::Unknown:
       {
         if (PythonQt::priv()->isEnumType(meta, info.name)) {
           unsigned int val = (unsigned int)PyObjGetLongLong(obj, strict, ok);
           if (ok) {
             PythonQtValueStorage_ADD_VALUE(global_valueStorage, unsigned int, val, ptr);
           }
         }
       }
       break;
       default:
       {
         // for all other types, we use the same qvariant conversion and pass out the constData of the variant:
         QVariant v = PyObjToQVariant(obj, info.typeId);
         if (v.isValid()) {
           PythonQtValueStorage_ADD_VALUE(global_variantStorage, QVariant, v, ptr);
           ptr = (void*)((QVariant*)ptr)->constData();
         }
       }
    }
  }
  return ptr;
}


QStringList PythonQtConv::PyObjToStringList(PyObject* val, bool strict, bool& ok) {
  QStringList v;
  ok = false;
  // if we are strict, we do not want to convert a string to a stringlist
  // (strings in python are detected to be sequences)
  if (strict &&
    (val->ob_type == &PyString_Type ||
    PyUnicode_Check(val))) {
    ok = false;
    return v;
  }
  if (PySequence_Check(val)) {
    int count = PySequence_Size(val);
    for (int i = 0;i<count;i++) {
      PyObject* value = PySequence_GetItem(val,i);
      v.append(PyObjGetString(value,false,ok));
    }
    ok = true;
  }
  return v;
}

QString PythonQtConv::PyObjGetRepresentation(PyObject* val)
{
  QString r;
  PyObject* str =  PyObject_Repr(val);
  if (str) {
    r = QString(PyString_AS_STRING(str));
    Py_DECREF(str);
  }
  return r;
}

QString PythonQtConv::PyObjGetString(PyObject* val, bool strict, bool& ok) {
  QString r;
  ok = true;
  if (val->ob_type == &PyString_Type) {
    r = QString(PyString_AS_STRING(val));
  } else if (PyUnicode_Check(val)) {
#ifdef WIN32
    r = QString::fromUtf16(PyUnicode_AS_UNICODE(val));
#else
    PyObject *ptmp = PyUnicode_AsUTF8String(val);
    if(ptmp) {
      r = QString::fromUtf8(PyString_AS_STRING(ptmp));
      Py_DECREF(ptmp);
    }
#endif
  } else if (!strict) {
    // EXTRA: could also use _Unicode, but why should we?
    PyObject* str =  PyObject_Str(val);
    if (str) {
      r = QString(PyString_AS_STRING(str));
      Py_DECREF(str);
    } else {
      ok = false;
    }
  } else {
    ok = false;
  }
  return r;
}

bool PythonQtConv::PyObjGetBool(PyObject* val, bool strict, bool &ok) {
  bool d = false;
  ok = false;
  if (val == Py_False) {
    d = false;
    ok = true;
  } else if (val == Py_True) {
    d = true;
    ok = true;
  } else if (!strict) {
    d = PyObjGetInt(val, false, ok)!=0;
    ok = true;
  }
  return d;
}

int PythonQtConv::PyObjGetInt(PyObject* val, bool strict, bool &ok) {
  int d = 0;
  ok = true;
  if (val->ob_type == &PyInt_Type) {
    d = PyInt_AS_LONG(val);
  } else if (!strict) {
    if (val->ob_type == &PyFloat_Type) {
      d = floor(PyFloat_AS_DOUBLE(val));
    } else if (val->ob_type == &PyLong_Type) {
      // handle error on overflow!
      d = PyLong_AsLong(val);
    } else if (val == Py_False) {
      d = 0;
    } else if (val == Py_True) {
      d = 1;
    } else {
      ok = false;
    }
  } else {
    ok = false;
  }
  return d;
}

qint64 PythonQtConv::PyObjGetLongLong(PyObject* val, bool strict, bool &ok) {
  qint64 d = 0;
  ok = true;
  if (val->ob_type == &PyInt_Type) {
    d = PyInt_AS_LONG(val);
  } else if (val->ob_type == &PyLong_Type) {
    d = PyLong_AsLongLong(val);
  } else if (!strict) {
    if (val->ob_type == &PyFloat_Type) {
      d = floor(PyFloat_AS_DOUBLE(val));
    } else if (val == Py_False) {
      d = 0;
    } else if (val == Py_True) {
      d = 1;
    } else {
      ok = false;
    }
  } else {
    ok = false;
  }
  return d;
}

quint64 PythonQtConv::PyObjGetULongLong(PyObject* val, bool strict, bool &ok) {
  quint64 d = 0;
  ok = true;
  if (val->ob_type == &PyInt_Type) {
    d = PyInt_AS_LONG(val);
  } else if (val->ob_type == &PyLong_Type) {
    d = PyLong_AsLongLong(val);
  } else if (!strict) {
    if (val->ob_type == &PyFloat_Type) {
      d = floor(PyFloat_AS_DOUBLE(val));
    } else if (val == Py_False) {
      d = 0;
    } else if (val == Py_True) {
      d = 1;
    } else {
      ok = false;
    }
  } else {
    ok = false;
  }
  return d;
}

double PythonQtConv::PyObjGetDouble(PyObject* val, bool strict, bool &ok) {
  double d = 0;
  ok = true;
  if (val->ob_type == &PyFloat_Type) {
    d = PyFloat_AS_DOUBLE(val);
  } else if (!strict) {
    if (val->ob_type == &PyInt_Type) {
      d = PyInt_AS_LONG(val);
    } else if (val->ob_type == &PyLong_Type) {
      d = PyLong_AsLong(val);
    } else if (val == Py_False) {
      d = 0;
    } else if (val == Py_True) {
      d = 1;
    } else {
      ok = false;
    }
  } else {
    ok = false;
  }
  return d;
}

QVariant PythonQtConv::PyObjToQVariant(PyObject* val, int type)
{
  QVariant v;
  bool ok = true;
  
  if (type==-1) {
    // no special type requested
    if (val->ob_type==&PyString_Type || val->ob_type==&PyUnicode_Type) {
      type = QVariant::String;
    } else if (val->ob_type==&PyInt_Type) {
      type = QVariant::Int;
    } else if (val->ob_type==&PyLong_Type) {
      type = QVariant::LongLong;
    } else if (val->ob_type==&PyFloat_Type) {
      type = QVariant::Double;
    } else if (val == Py_False || val == Py_True) {
      type = QVariant::Bool;
    } else if (val->ob_type == &PythonQtWrapper_Type) {
      PythonQtWrapper* wrap = (PythonQtWrapper*)val;
      // c++ wrapper, check if the class names of the c++ objects match
      if (wrap->_info->isCPPWrapper()) {
        // is this worth anything? we loose the knowledge of the cpp object type
        v = qVariantFromValue(wrap->_wrappedPtr);
      } else {
        v = qVariantFromValue(wrap->_obj);
      }
      return v;
    } else if (val->ob_type==&PyDict_Type) {
      type = QVariant::Map;
    } else if (val->ob_type==&PyList_Type || val->ob_type==&PyTuple_Type || PySequence_Check(val)) {
      type = QVariant::List;
    } else if (val == Py_None) {
      // none is invalid
      type = QVariant::Invalid;
    } else if (val->ob_type == &PythonQtVariantWrapper_Type) {
      PythonQtVariantWrapper* varWrap = (PythonQtVariantWrapper*)val;
      if (varWrap->_variant->userType() == type) {
        v = *varWrap->_variant;
        return v;
      }
    } else {
      // this used to be:
      // type = QVariant::String;
      // but now we want to transport the Python Objects directly:
      PythonQtObjectPtr o(val);
      v = qVariantFromValue(o);
      return v;
    }
  }
  // special type request:
  switch (type) {
  case QVariant::Invalid:
    return v;
    break;
  case QVariant::Int:
    {
      int d = PyObjGetInt(val, false, ok);
      if (ok) return QVariant(d);
    }
    break;
  case QVariant::UInt:
    {
      int d = PyObjGetInt(val, false,ok);
      if (ok) v = QVariant((unsigned int)d);
    }
    break;
  case QVariant::Bool:
    {
      int d = PyObjGetBool(val,false,ok);
      if (ok) v =  QVariant((bool)(d!=0));
    }
    break;
  case QVariant::Double:
    {
      double d = PyObjGetDouble(val,false,ok);
      if (ok) v =  QVariant(d);
      break;
    }
  case QMetaType::Float:
    {
      float d = (float) PyObjGetDouble(val,false,ok);
      if (ok) v =  qVariantFromValue(d);
      break;
    }
  case QMetaType::Long:
    {
      long d = (long) PyObjGetLongLong(val,false,ok);
      if (ok) v =  qVariantFromValue(d);
      break;
    }
  case QMetaType::ULong:
    {
      unsigned long d = (unsigned long) PyObjGetLongLong(val,false,ok);
      if (ok) v =  qVariantFromValue(d);
      break;
    }
  case QMetaType::Short:
    {
      short d = (short) PyObjGetInt(val,false,ok);
      if (ok) v =  qVariantFromValue(d);
      break;
    }
  case QMetaType::UShort:
    {
      unsigned short d = (unsigned short) PyObjGetInt(val,false,ok);
      if (ok) v =  qVariantFromValue(d);
      break;
    }
  case QMetaType::Char:
    {
      char d = (char) PyObjGetInt(val,false,ok);
      if (ok) v =  qVariantFromValue(d);
      break;
    }
  case QMetaType::UChar:
    {
      unsigned char d = (unsigned char) PyObjGetInt(val,false,ok);
      if (ok) v =  qVariantFromValue(d);
      break;
    }
    
  case QVariant::ByteArray:
  case QVariant::String:
    {
      bool ok;
      v = QVariant(PyObjGetString(val, false, ok));
    }
    break;
    
    // these are important for MeVisLab
  case QVariant::Map:
    {
      if (PyMapping_Check(val)) {
        QMap<QString,QVariant> map;
        PyObject* items = PyMapping_Items(val);
        if (items) {
          int count = PyList_Size(items);
          PyObject* value;
          PyObject* key;
          PyObject* tuple;
          for (int i = 0;i<count;i++) {
            tuple = PyList_GetItem(items,i);
            key = PyTuple_GetItem(tuple, 0);
            value = PyTuple_GetItem(tuple, 1);
            map.insert(PyObjGetString(key), PyObjToQVariant(value,-1));
          }
          Py_DECREF(items);
          v = map;
        }
      }
    }
    break;
  case QVariant::List:
    if (PySequence_Check(val)) {
      QVariantList list;
      int count = PySequence_Size(val);
      PyObject* value;
      for (int i = 0;i<count;i++) {
        value = PySequence_GetItem(val,i);
        list.append(PyObjToQVariant(value, -1));
      }
      v = list;
    }
    break;
  case QVariant::StringList:
    {
      bool ok;
      QStringList l = PyObjToStringList(val, false, ok);
      if (ok) {
        v = l;
      }
    }
    break;
    
  default:
    if (val->ob_type == &PythonQtVariantWrapper_Type) {
      PythonQtVariantWrapper* varWrap = (PythonQtVariantWrapper*)val;
      if (varWrap->_variant->userType() == type) {
        v = *varWrap->_variant;
      }
    } else {
      v = QVariant();
    }
  }
  return v;
}

PyObject* PythonQtConv::QStringToPyObject(const QString& str)
{
  if (str.isNull()) {
    return PyString_FromString("");
  } else {
#ifdef WIN32
    //    return PyString_FromString(str.toLatin1().data());
    return PyUnicode_FromUnicode(str.utf16(), str.length());
#else
    return PyUnicode_DecodeUTF16((const char*)str.utf16(), str.length()*2, NULL, NULL);
#endif
  }
}

PyObject* PythonQtConv::QStringListToPyObject(const QStringList& list)
{
  PyObject* result = PyTuple_New(list.count());
  int i = 0;
  QString str;
  foreach (str, list) {
    PyTuple_SET_ITEM(result, i, PythonQtConv::QStringToPyObject(str));
    i++;
  }
  // why is the error state bad after this?
  PyErr_Clear();
  return result;
}

PyObject* PythonQtConv::QStringListToPyList(const QStringList& list)
{
  PyObject* result = PyList_New(list.count());
  int i = 0;
  for (QStringList::ConstIterator it = list.begin(); it!=list.end(); ++it) {
    PyList_SET_ITEM(result, i, PythonQtConv::QStringToPyObject(*it));
    i++;
  }
  return result;
}

PyObject* PythonQtConv::QVariantToPyObject(const QVariant& v)
{
  return ConvertQtValueToPythonInternal(v.userType(), (void*)v.constData());
}

PyObject* PythonQtConv::QVariantMapToPyObject(const QVariantMap& m) {
  PyObject* result = PyDict_New();
  QVariantMap::const_iterator t = m.constBegin();
  PyObject* key;
  PyObject* val;
  for (;t!=m.end();t++) {
    key = QStringToPyObject(t.key());
    val = QVariantToPyObject(t.value());
    PyDict_SetItem(result, key, val);
    Py_DECREF(key);
    Py_DECREF(val);
  }
  return result;
}

PyObject* PythonQtConv::QVariantListToPyObject(const QVariantList& l) {
  PyObject* result = PyTuple_New(l.count());
  int i = 0;
  QVariant v;
  foreach (v, l) {
    PyTuple_SET_ITEM(result, i, PythonQtConv::QVariantToPyObject(v));
    i++;
  }
  // why is the error state bad after this?
  PyErr_Clear();
  return result;
}