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/*
* This file is part of the Shiboken Python Bindings Generator project.
*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
*
* Contact: PySide team <contact@pyside.org>
*
* 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.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef BASEWRAPPER_P_H
#define BASEWRAPPER_P_H
#include <Python.h>
#include <list>
namespace Shiboken
{
struct SbkBaseWrapperType;
/**
* Visitor class used by walkOnClassHierarchy function.
*/
class HierarchyVisitor
{
public:
HierarchyVisitor() : m_wasFinished(false) {}
virtual ~HierarchyVisitor() {}
virtual void visit(SbkBaseWrapperType* node) = 0;
void finish() { m_wasFinished = true; };
bool wasFinished() const { return m_wasFinished; }
private:
bool m_wasFinished;
};
class BaseCountVisitor : public HierarchyVisitor
{
public:
BaseCountVisitor() : m_count(0) {}
void visit(SbkBaseWrapperType*)
{
m_count++;
}
int count() const { return m_count; }
private:
int m_count;
};
class BaseAccumulatorVisitor : public HierarchyVisitor
{
public:
BaseAccumulatorVisitor() {}
void visit(SbkBaseWrapperType* node)
{
m_bases.push_back(node);
}
std::list<SbkBaseWrapperType*> bases() const { return m_bases; }
private:
std::list<SbkBaseWrapperType*> m_bases;
};
class GetIndexVisitor : public HierarchyVisitor
{
public:
GetIndexVisitor(PyTypeObject* desiredType) : m_index(-1), m_desiredType(desiredType) {}
virtual void visit(SbkBaseWrapperType* node)
{
m_index++;
if (PyType_IsSubtype(reinterpret_cast<PyTypeObject*>(node), m_desiredType))
finish();
}
int index() const { return m_index; }
private:
int m_index;
PyTypeObject* m_desiredType;
};
/// \internal Internal function used to walk on classes inheritance trees.
/**
* Walk on class hierarchy using a DFS algorithm.
* For each pure Shiboken type found, HiearchyVisitor::visit is called and the algorithm consider
* all children of this type as visited.
*/
void walkThroughClassHierarchy(PyTypeObject* currentType, HierarchyVisitor* visitor);
inline int getTypeIndexOnHierarchy(PyTypeObject* baseType, PyTypeObject* desiredType)
{
GetIndexVisitor visitor(desiredType);
walkThroughClassHierarchy(baseType, &visitor);
return visitor.index();
}
inline int getNumberOfCppBaseClasses(PyTypeObject* baseType)
{
BaseCountVisitor visitor;
walkThroughClassHierarchy(baseType, &visitor);
return visitor.count();
}
inline std::list<SbkBaseWrapperType*> getCppBaseClasses(PyTypeObject* baseType)
{
BaseAccumulatorVisitor visitor;
walkThroughClassHierarchy(baseType, &visitor);
return visitor.bases();
}
struct SbkBaseWrapper;
/// Linked list of SbkBaseWrapper pointers
typedef std::list<SbkBaseWrapper*> ChildrenList;
/// Struct used to store information about object parent and children.
struct ParentInfo
{
/// Default ctor.
ParentInfo() : parent(0) {}
/// Pointer to parent object.
SbkBaseWrapper* parent;
/// List of object children.
ChildrenList children;
};
/**
* Decrements the reference counters of every object referred by self.
* \param self the wrapper instance that keeps references to other objects.
*/
void clearReferences(SbkBaseWrapper* self);
}
#endif
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