PythonQtConversion.h

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#ifndef _PYTHONQTCONVERSION_H
#define _PYTHONQTCONVERSION_H
 
/*
 *
 *  Copyright (C) 2010 MeVis Medical Solutions AG 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 Medical Solutions AG, Universitaetsallee 29,
 *  28359 Bremen, Germany or:
 *
 *  http://www.mevis.de
 *
 */
 
//----------------------------------------------------------------------------------
//----------------------------------------------------------------------------------
 
#include "PythonQtPythonInclude.h"
#include "PythonQt.h"
#include "PythonQtMisc.h"
#include "PythonQtClassInfo.h"
#include "PythonQtMethodInfo.h"
 
#include <QList>
#include <vector>
 
typedef PyObject* PythonQtConvertMetaTypeToPythonCB(const void* inObject, int metaTypeId);
typedef bool PythonQtConvertPythonToMetaTypeCB(PyObject* inObject, void* outObject, int metaTypeId, bool strict);
typedef QVariant PythonQtConvertPythonSequenceToQVariantListCB(PyObject* inObject);
 
#define PythonQtRegisterListTemplateConverter(type, innertype) \
  { \
    int typeId = qRegisterMetaType<type<innertype>>(#type "<" #innertype ">"); \
    PythonQtConv::registerPythonToMetaTypeConverter(typeId, \
      PythonQtConvertPythonListToListOfValueType<type<innertype>, innertype>); \
    PythonQtConv::registerMetaTypeToPythonConverter(typeId, \
      PythonQtConvertListOfValueTypeToPythonList<type<innertype>, innertype>); \
  }
 
#define PythonQtRegisterListTemplateConverterForKnownClass(type, innertype) \
  { \
    int typeId = qRegisterMetaType<type<innertype>>(#type "<" #innertype ">"); \
    PythonQtConv::registerPythonToMetaTypeConverter(typeId, \
      PythonQtConvertPythonListToListOfKnownClass<type<innertype>, innertype>); \
    PythonQtConv::registerMetaTypeToPythonConverter(typeId, \
      PythonQtConvertListOfKnownClassToPythonList<type<innertype>, innertype>); \
  }
 
#define PythonQtRegisterQPairConverter(type1, type2) \
  { \
    int typeId = qRegisterMetaType<QPair<type1, type2>>("QPair<" #type1 "," #type2 ">"); \
    PythonQtConv::registerPythonToMetaTypeConverter(typeId, PythonQtConvertPythonToPair<type1, type2>); \
    PythonQtConv::registerMetaTypeToPythonConverter(typeId, PythonQtConvertPairToPython<type1, type2>); \
  }
 
#define PythonQtRegisterIntegerMapConverter(type, innertype) \
  { \
    int typeId = qRegisterMetaType<type<int, innertype>>(#type "<int, " #innertype ">"); \
    PythonQtConv::registerPythonToMetaTypeConverter(typeId, \
      PythonQtConvertPythonToIntegerMap<type<int, innertype>, innertype>); \
    PythonQtConv::registerMetaTypeToPythonConverter(typeId, \
      PythonQtConvertIntegerMapToPython<type<int, innertype>, innertype>); \
  }
 
#define PythonQtRegisterListTemplateQPairConverter(listtype, type1, type2) \
  { \
    qRegisterMetaType<QPair<type1, type2>>("QPair<" #type1 "," #type2 ">"); \
    int typeId = qRegisterMetaType<listtype<QPair<type1, type2>>>(#listtype "<QPair<" #type1 "," #type2 ">>"); \
    PythonQtConv::registerPythonToMetaTypeConverter(typeId, \
      PythonQtConvertPythonListToListOfPair<listtype<QPair<type1, type2>>, type1, type2>); \
    PythonQtConv::registerMetaTypeToPythonConverter(typeId, \
      PythonQtConvertListOfPairToPythonList<listtype<QPair<type1, type2>>, type1, type2>); \
  }
 
#define PythonQtRegisterToolClassesTemplateConverter(innertype) \
  PythonQtRegisterListTemplateConverter(QList, innertype); \
  PythonQtRegisterListTemplateConverter(QVector, innertype); \
  PythonQtRegisterListTemplateConverter(std::vector, innertype);
 
#define PythonQtRegisterToolClassesTemplateConverterForKnownClass(innertype) \
  PythonQtRegisterListTemplateConverterForKnownClass(QList, innertype); \
  PythonQtRegisterListTemplateConverterForKnownClass(QVector, innertype); \
  PythonQtRegisterListTemplateConverterForKnownClass(std::vector, innertype);
 
class PYTHONQT_EXPORT PythonQtConv
{
 
public:
 
  static PyObject* GetPyBool(bool val);
 
  static PyObject* ConvertQtValueToPython(const PythonQtMethodInfo::ParameterInfo& info, const void* data);
 
  static void* ConvertPythonToQt(const PythonQtMethodInfo::ParameterInfo& info, PyObject* obj, bool strict,
    PythonQtClassInfo* classInfo, void* alreadyAllocatedCPPObject, PythonQtArgumentFrame* frame = nullptr);
 
  static void* CreateQtReturnValue(const PythonQtMethodInfo::ParameterInfo& info, PythonQtArgumentFrame* frame);
 
  static PyObject* QStringToPyObject(const QString& str);
 
  static PyObject* QStringListToPyObject(const QStringList& list);
 
  static PyObject* QStringListToPyList(const QStringList& list);
 
  static QString PyObjGetRepresentation(PyObject* val);
 
  static QString PyObjGetString(PyObject* val)
  {
    bool ok;
    QString s = PyObjGetString(val, false, ok);
    return s;
  }
  static QString PyObjGetString(PyObject* val, bool strict, bool& ok);
  static QByteArray PyObjGetBytes(PyObject* val, bool strict, bool& ok);
  static QByteArray PyObjGetBytesAllowString(PyObject* val, bool strict, bool& ok);
  static int PyObjGetInt(PyObject* val, bool strict, bool& ok);
  static qint64 PyObjGetLongLong(PyObject* val, bool strict, bool& ok);
  static quint64 PyObjGetULongLong(PyObject* val, bool strict, bool& ok);
  static double PyObjGetDouble(PyObject* val, bool strict, bool& ok);
  static bool PyObjGetBool(PyObject* val, bool strict, bool& ok);
 
  static QStringList PyObjToStringList(PyObject* val, bool strict, bool& ok);
 
  static QVariant PyObjToQVariant(PyObject* val, int type = -1);
 
  static PyObject* QVariantToPyObject(const QVariant& v);
 
  static PyObject* QVariantHashToPyObject(const QVariantHash& m);
  static PyObject* QVariantMapToPyObject(const QVariantMap& m);
  static PyObject* QVariantListToPyObject(const QVariantList& l);
 
  static QString CPPObjectToString(int type, const void* data);
 
  static void registerPythonToMetaTypeConverter(int metaTypeId, PythonQtConvertPythonToMetaTypeCB* cb)
  {
    _pythonToMetaTypeConverters.insert(metaTypeId, cb);
  }
 
  static void registerMetaTypeToPythonConverter(int metaTypeId, PythonQtConvertMetaTypeToPythonCB* cb)
  {
    _metaTypeToPythonConverters.insert(metaTypeId, cb);
  }
 
  static void setPythonSequenceToQVariantListCallback(PythonQtConvertPythonSequenceToQVariantListCB* cb)
  {
    _pythonSequenceToQVariantListCB = cb;
  }
 
  static PyObject* convertQtValueToPythonInternal(int type, const void* data);
 
  static PyObject* createCopyFromMetaType(int type, const void* object);
 
  static void* castWrapperTo(PythonQtInstanceWrapper* wrapper, const QByteArray& className, bool& ok);
 
  static bool convertToPythonQtObjectPtr(PyObject* obj, void* /* PythonQtObjectPtr* */ outPtr, int /*metaTypeId*/,
    bool /*strict*/);
  static PyObject* convertFromPythonQtObjectPtr(const void* /* PythonQtObjectPtr* */ inObject, int /*metaTypeId*/);
  static bool convertToPythonQtSafeObjectPtr(PyObject* obj, void* /* PythonQtObjectPtr* */ outPtr, int /*metaTypeId*/,
    bool /*strict*/);
  static PyObject* convertFromPythonQtSafeObjectPtr(const void* /* PythonQtObjectPtr* */ inObject, int /*metaTypeId*/);
  static bool convertToQListOfPythonQtObjectPtr(PyObject* obj, void* /* QList<PythonQtObjectPtr>* */ outList,
    int /*metaTypeId*/, bool /*strict*/);
  static PyObject* convertFromQListOfPythonQtObjectPtr(const void* /* QList<PythonQtObjectPtr>* */ inObject,
    int /*metaTypeId*/);
#if QT_VERSION < 0x060000
  static PyObject* convertFromStringRef(const void* inObject, int /*metaTypeId*/);
#else
  static PyObject* convertFromStringView(const void* inObject, int /*metaTypeId*/);
  static PyObject* convertFromAnyStringView(const void* inObject, int /*metaTypeId*/);
  static PyObject* convertFromByteArrayView(const void* inObject, int /*metaTypeId*/);
#endif
 
  static QByteArray getCPPTypeName(PyObject* type);
 
  static bool isStringType(PyTypeObject* type);
 
  static void registerStringViewTypes();
 
protected:
  static QHash<int, PythonQtConvertMetaTypeToPythonCB*> _metaTypeToPythonConverters;
  static QHash<int, PythonQtConvertPythonToMetaTypeCB*> _pythonToMetaTypeConverters;
  static PythonQtConvertPythonSequenceToQVariantListCB* _pythonSequenceToQVariantListCB;
 
  static void* handlePythonToQtAutoConversion(int typeId, PyObject* obj, void* alreadyAllocatedCPPObject,
    PythonQtArgumentFrame* frame);
 
  static PyObject* ConvertQListOfPointerTypeToPythonList(QList<void*>* list,
    const PythonQtMethodInfo::ParameterInfo& info);
  static bool ConvertPythonListToQListOfPointerType(PyObject* obj, QList<void*>* list,
    const PythonQtMethodInfo::ParameterInfo& info, bool strict);
 
  template<typename Map>
  static void pythonToMapVariant(PyObject* val, QVariant& result);
  template<typename Map>
  static PyObject* mapToPython(const Map& m);
 
#if QT_VERSION < 0x060000
  static int stringRefTypeId;
#else
  static int stringViewTypeId;
  static int anyStringViewTypeId;
  static int byteArrayViewTypeId;
#endif
};
 
template<class ListType, class T>
PyObject* PythonQtConvertListOfValueTypeToPythonList(const void* /*QList<T>* */ inList, int metaTypeId)
{
  ListType* list = (ListType*)inList;
  static const int innerType =
    PythonQtMethodInfo::getInnerTemplateMetaType(QByteArray(PythonQtUtils::typeNameFromMetaTypeId(metaTypeId)));
  if (innerType == QMetaType::UnknownType) {
    std::cerr << "PythonQtConvertListOfValueTypeToPythonList: unknown inner type "
              << PythonQtUtils::typeNameFromMetaTypeId(metaTypeId) << std::endl;
  }
  PyObject* result = PyTuple_New(list->size());
  int i = 0;
  for (const T& value : *list) {
    PyTuple_SET_ITEM(result, i, PythonQtConv::convertQtValueToPythonInternal(innerType, &value));
    i++;
  }
  return result;
}
 
template<class ListType, class T>
bool PythonQtConvertPythonListToListOfValueType(PyObject* obj, void* /*QList<T>* */ outList, int metaTypeId,
  bool /*strict*/)
{
  ListType* list = (ListType*)outList;
  static const int innerType =
    PythonQtMethodInfo::getInnerTemplateMetaType(QByteArray(PythonQtUtils::typeNameFromMetaTypeId(metaTypeId)));
  if (innerType == QMetaType::UnknownType) {
    std::cerr << "PythonQtConvertPythonListToListOfValueType: unknown inner type "
              << PythonQtUtils::typeNameFromMetaTypeId(metaTypeId) << std::endl;
  }
  bool result = false;
  if (PySequence_Check(obj)) {
    int count = PySequence_Size(obj);
    if (count >= 0) {
      result = true;
      PyObject* value;
      for (int i = 0; i < count; i++) {
        value = PySequence_GetItem(obj, i);
        // this is quite some overhead, but it avoids having another large switch...
        QVariant v = PythonQtConv::PyObjToQVariant(value, innerType);
        Py_XDECREF(value);
        if (v.isValid()) {
          list->push_back(qvariant_cast<T>(v));
        } else {
          result = false;
          break;
        }
      }
    }
  }
  return result;
}
 
//--------------------------------------------------------------------------------------------------------------------
 
template<class ListType, class T>
PyObject* PythonQtConvertListOfKnownClassToPythonList(const void* /*QList<T>* */ inList, int metaTypeId)
{
  ListType* list = (ListType*)inList;
  static PythonQtClassInfo* innerType = PythonQt::priv()->getClassInfo(
    PythonQtMethodInfo::getInnerListTypeName(QByteArray(PythonQtUtils::typeNameFromMetaTypeId(metaTypeId))));
  if (innerType == nullptr) {
    std::cerr << "PythonQtConvertListOfKnownClassToPythonList: unknown inner type for "
              << PythonQtUtils::typeNameFromMetaTypeId(metaTypeId) << std::endl;
  }
  PyObject* result = PyTuple_New(list->size());
  int i = 0;
  for (const T& value : *list) {
    T* newObject = new T(value);
    PythonQtInstanceWrapper* wrap =
      (PythonQtInstanceWrapper*)PythonQt::priv()->wrapPtr(newObject, innerType->className());
    wrap->_ownedByPythonQt = true;
    PyTuple_SET_ITEM(result, i, (PyObject*)wrap);
    i++;
  }
  return result;
}
 
template<class ListType, class T>
bool PythonQtConvertPythonListToListOfKnownClass(PyObject* obj, void* /*QList<T>* */ outList, int metaTypeId,
  bool /*strict*/)
{
  ListType* list = (ListType*)outList;
  static PythonQtClassInfo* innerType = PythonQt::priv()->getClassInfo(
    PythonQtMethodInfo::getInnerListTypeName(QByteArray(PythonQtUtils::typeNameFromMetaTypeId(metaTypeId))));
  if (innerType == nullptr) {
    std::cerr << "PythonQtConvertListOfKnownClassToPythonList: unknown inner type for "
              << PythonQtUtils::typeNameFromMetaTypeId(metaTypeId) << std::endl;
  }
  bool result = false;
  if (PySequence_Check(obj)) {
    int count = PySequence_Size(obj);
    if (count >= 0) {
      result = true;
      PyObject* value;
      for (int i = 0; i < count; i++) {
        value = PySequence_GetItem(obj, i);
        if (PyObject_TypeCheck(value, &PythonQtInstanceWrapper_Type)) {
          PythonQtInstanceWrapper* wrap = (PythonQtInstanceWrapper*)value;
          bool ok;
          T* object = (T*)PythonQtConv::castWrapperTo(wrap, innerType->className(), ok);
          Py_XDECREF(value);
          if (ok) {
            list->push_back(*object);
          } else {
            result = false;
            break;
          }
        } else {
          Py_XDECREF(value);
          result = false;
          break;
        }
      }
    }
  }
  return result;
}
 
//--------------------------------------------------------------------------------------------------------------------
 
template<class T1, class T2>
PyObject* PythonQtConvertPairToPython(const void* /*QPair<T1,T2>* */ inPair, int metaTypeId)
{
  QPair<T1, T2>* pair = (QPair<T1, T2>*)inPair;
  static int innerType1 = -1;
  static int innerType2 = -1;
  if (innerType1 == -1) {
    QByteArray innerTypes =
      PythonQtMethodInfo::getInnerTemplateTypeName(QByteArray(PythonQtUtils::typeNameFromMetaTypeId(metaTypeId)));
    QList<QByteArray> names = innerTypes.split(',');
    innerType1 = PythonQtUtils::metaTypeIdFromTypeName(names.at(0).trimmed());
    innerType2 = PythonQtUtils::metaTypeIdFromTypeName(names.at(1).trimmed());
  }
  if (innerType1 == QMetaType::UnknownType || innerType2 == QMetaType::UnknownType) {
    std::cerr << "PythonQtConvertPairToPython: unknown inner type " << PythonQtUtils::typeNameFromMetaTypeId(metaTypeId)
              << std::endl;
  }
  PyObject* result = PyTuple_New(2);
  PyTuple_SET_ITEM(result, 0, PythonQtConv::convertQtValueToPythonInternal(innerType1, &pair->first));
  PyTuple_SET_ITEM(result, 1, PythonQtConv::convertQtValueToPythonInternal(innerType2, &pair->second));
  return result;
}
 
template<class T1, class T2>
bool PythonQtConvertPythonToPair(PyObject* obj, void* /*QPair<T1,T2>* */ outPair, int metaTypeId, bool /*strict*/)
{
  QPair<T1, T2>* pair = (QPair<T1, T2>*)outPair;
  static int innerType1 = -1;
  static int innerType2 = -1;
  if (innerType1 == -1) {
    QByteArray innerTypes =
      PythonQtMethodInfo::getInnerTemplateTypeName(QByteArray(PythonQtUtils::typeNameFromMetaTypeId(metaTypeId)));
    QList<QByteArray> names = innerTypes.split(',');
    innerType1 = PythonQtUtils::metaTypeIdFromTypeName(names.at(0).trimmed());
    innerType2 = PythonQtUtils::metaTypeIdFromTypeName(names.at(1).trimmed());
  }
  if (innerType1 == QMetaType::UnknownType || innerType2 == QMetaType::UnknownType) {
    std::cerr << "PythonQtConvertPythonToPair: unknown inner type " << PythonQtUtils::typeNameFromMetaTypeId(metaTypeId)
              << std::endl;
  }
  bool result = false;
  if (PySequence_Check(obj)) {
    int count = PySequence_Size(obj);
    if (count == 2) {
      result = true;
      PyObject* value;
 
      value = PySequence_GetItem(obj, 0);
      // this is quite some overhead, but it avoids having another large switch...
      QVariant v = PythonQtConv::PyObjToQVariant(value, innerType1);
      Py_XDECREF(value);
      if (v.isValid()) {
        pair->first = qvariant_cast<T1>(v);
      } else {
        return false;
      }
 
      value = PySequence_GetItem(obj, 1);
      // this is quite some overhead, but it avoids having another large switch...
      v = PythonQtConv::PyObjToQVariant(value, innerType2);
      Py_XDECREF(value);
      if (v.isValid()) {
        pair->second = qvariant_cast<T2>(v);
      } else {
        return false;
      }
    }
  }
  return result;
}
 
//--------------------------------------------------------------------------------------------------------------------
 
template<class ListType, class T1, class T2>
PyObject* PythonQtConvertListOfPairToPythonList(const void* /*QList<QPair<T1,T2> >* */ inList, int metaTypeId)
{
  ListType* list = (ListType*)inList;
  static int innerType =
    PythonQtMethodInfo::getInnerTemplateMetaType(QByteArray(PythonQtUtils::typeNameFromMetaTypeId(metaTypeId)));
  if (innerType == QMetaType::UnknownType) {
    std::cerr << "PythonQtConvertListOfPairToPythonList: unknown inner type "
              << PythonQtUtils::typeNameFromMetaTypeId(metaTypeId) << std::endl;
  }
  PyObject* result = PyTuple_New(list->size());
  int i = 0;
  typedef const QPair<T1, T2> Pair;
  for (Pair& value : *list) {
    PyObject* object = PythonQtConvertPairToPython<T1, T2>(&value, innerType);
    PyTuple_SET_ITEM(result, i, object);
    i++;
  }
  return result;
}
 
template<class ListType, class T1, class T2>
bool PythonQtConvertPythonListToListOfPair(PyObject* obj, void* /*QList<QPair<T1,T2> >* */ outList, int metaTypeId,
  bool /*strict*/)
{
  ListType* list = (ListType*)outList;
  static int innerType =
    PythonQtMethodInfo::getInnerTemplateMetaType(QByteArray(PythonQtUtils::typeNameFromMetaTypeId(metaTypeId)));
  if (innerType == QMetaType::UnknownType) {
    std::cerr << "PythonQtConvertPythonListToListOfPair: unknown inner type "
              << PythonQtUtils::typeNameFromMetaTypeId(metaTypeId) << std::endl;
  }
  bool result = false;
  if (PySequence_Check(obj)) {
    int count = PySequence_Size(obj);
    if (count >= 0) {
      result = true;
      PyObject* value;
      for (int i = 0; i < count; i++) {
        QPair<T1, T2> pair;
        value = PySequence_GetItem(obj, i);
        if (PythonQtConvertPythonToPair<T1, T2>(value, &pair, innerType, false)) {
          Py_XDECREF(value);
          list->push_back(pair);
        } else {
          Py_XDECREF(value);
          result = false;
          break;
        }
      }
    }
  }
  return result;
}
 
//--------------------------------------------------------------------------------------------------------------------
 
template<class MapType, class T>
PyObject* PythonQtConvertIntegerMapToPython(const void* /*QMap<int, T>* */ inMap, int metaTypeId)
{
  MapType* map = (MapType*)inMap;
  static int innerType = -1;
  if (innerType == -1) {
    QByteArray innerTypes =
      PythonQtMethodInfo::getInnerTemplateTypeName(QByteArray(PythonQtUtils::typeNameFromMetaTypeId(metaTypeId)));
    QList<QByteArray> names = innerTypes.split(',');
    innerType = PythonQtUtils::metaTypeIdFromTypeName(names.at(1).trimmed());
  }
  if (innerType == QMetaType::UnknownType) {
    std::cerr << "PythonQtConvertIntegerMapToPython: unknown inner type "
              << PythonQtUtils::typeNameFromMetaTypeId(metaTypeId) << std::endl;
  }
 
  PyObject* result = PyDict_New();
  typename MapType::const_iterator t = map->constBegin();
  PyObject* key;
  PyObject* val;
  for (; t != map->constEnd(); t++) {
    key = PyLong_FromLong(t.key());
    val = PythonQtConv::convertQtValueToPythonInternal(innerType, &t.value());
    PyDict_SetItem(result, key, val);
    Py_DECREF(key);
    Py_DECREF(val);
  }
  return result;
}
 
template<class MapType, class T>
bool PythonQtConvertPythonToIntegerMap(PyObject* val, void* /*QMap<int, T>* */ outMap, int metaTypeId, bool /*strict*/)
{
  MapType* map = (MapType*)outMap;
  static int innerType = -1;
  if (innerType == -1) {
    QByteArray innerTypes =
      PythonQtMethodInfo::getInnerTemplateTypeName(QByteArray(PythonQtUtils::typeNameFromMetaTypeId(metaTypeId)));
    QList<QByteArray> names = innerTypes.split(',');
    innerType = PythonQtUtils::metaTypeIdFromTypeName(names.at(1).trimmed());
  }
  if (innerType == QMetaType::UnknownType) {
    std::cerr << "PythonQtConvertPythonToIntegerMap: unknown inner type "
              << PythonQtUtils::typeNameFromMetaTypeId(metaTypeId) << std::endl;
  }
  bool result = false;
  if (PyMapping_Check(val)) {
    result = true;
    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);
 
        bool ok;
        int intKey = PythonQtConv::PyObjGetInt(key, false, ok);
        // this is quite some overhead, but it avoids having another large switch...
        QVariant v = PythonQtConv::PyObjToQVariant(value, innerType);
        if (v.isValid() && ok) {
          map->insert(intKey, qvariant_cast<T>(v));
        } else {
          result = false;
          break;
        }
      }
      Py_DECREF(items);
    }
  }
  return result;
}
 
#endif