#ifndef RenderIterator_h
#define RenderIterator_h
#include "RenderElement.h"
namespace WebCore {
template <typename T>
class RenderIterator {
public:
RenderIterator(const RenderElement* root);
RenderIterator(const RenderElement* root, T* current);
T& operator*();
T* operator->();
bool operator==(const RenderIterator& other) const;
bool operator!=(const RenderIterator& other) const;
RenderIterator& traverseNextSibling();
RenderIterator& traversePreviousSibling();
RenderIterator& traverseAncestor();
private:
const RenderElement* m_root;
T* m_current;
};
template <typename T>
class RenderConstIterator {
public:
RenderConstIterator(const RenderElement* root);
RenderConstIterator(const RenderElement* root, const T* current);
const T& operator*() const;
const T* operator->() const;
bool operator==(const RenderConstIterator& other) const;
bool operator!=(const RenderConstIterator& other) const;
RenderConstIterator& traverseNextSibling();
RenderConstIterator& traversePreviousSibling();
RenderConstIterator& traverseAncestor();
private:
const RenderElement* m_root;
const T* m_current;
};
namespace RenderTraversal {
template <typename T, typename U>
inline T* firstChild(U& current)
{
RenderObject* object = current.firstChild();
while (object && !isRendererOfType<const T>(*object))
object = object->nextSibling();
return static_cast<T*>(object);
}
template <typename T, typename U>
inline T* lastChild(U& current)
{
RenderObject* object = current.lastChild();
while (object && !isRendererOfType<const T>(*object))
object = object->previousSibling();
return static_cast<T*>(object);
}
template <typename T, typename U>
inline T* nextSibling(U& current)
{
RenderObject* object = current.nextSibling();
while (object && !isRendererOfType<const T>(*object))
object = object->nextSibling();
return static_cast<T*>(object);
}
template <typename T, typename U>
inline T* previousSibling(U& current)
{
RenderObject* object = current.previousSibling();
while (object && !isRendererOfType<const T>(*object))
object = object->previousSibling();
return static_cast<T*>(object);
}
template <typename T>
inline T* findAncestorOfType(const RenderObject& current)
{
for (auto ancestor = current.parent(); ancestor; ancestor = ancestor->parent()) {
if (isRendererOfType<const T>(*ancestor))
return static_cast<T*>(ancestor);
}
return nullptr;
}
}
template <typename T>
inline RenderIterator<T>::RenderIterator(const RenderElement* root)
: m_root(root)
, m_current(nullptr)
{
}
template <typename T>
inline RenderIterator<T>::RenderIterator(const RenderElement* root, T* current)
: m_root(root)
, m_current(current)
{
}
template <typename T>
inline RenderIterator<T>& RenderIterator<T>::traverseNextSibling()
{
ASSERT(m_current);
m_current = RenderTraversal::nextSibling<T>(*m_current);
return *this;
}
template <typename T>
inline RenderIterator<T>& RenderIterator<T>::traversePreviousSibling()
{
ASSERT(m_current);
m_current = RenderTraversal::previousSibling<T>(*m_current);
return *this;
}
template <typename T>
inline RenderIterator<T>& RenderIterator<T>::traverseAncestor()
{
ASSERT(m_current);
ASSERT(m_current != m_root);
m_current = RenderTraversal::findAncestorOfType<T>(*m_current);
return *this;
}
template <typename T>
inline T& RenderIterator<T>::operator*()
{
ASSERT(m_current);
return *m_current;
}
template <typename T>
inline T* RenderIterator<T>::operator->()
{
ASSERT(m_current);
return m_current;
}
template <typename T>
inline bool RenderIterator<T>::operator==(const RenderIterator& other) const
{
ASSERT(m_root == other.m_root);
return m_current == other.m_current;
}
template <typename T>
inline bool RenderIterator<T>::operator!=(const RenderIterator& other) const
{
return !(*this == other);
}
template <typename T>
inline RenderConstIterator<T>::RenderConstIterator(const RenderElement* root)
: m_root(root)
, m_current(nullptr)
{
}
template <typename T>
inline RenderConstIterator<T>::RenderConstIterator(const RenderElement* root, const T* current)
: m_root(root)
, m_current(current)
{
}
template <typename T>
inline RenderConstIterator<T>& RenderConstIterator<T>::traverseNextSibling()
{
ASSERT(m_current);
m_current = RenderTraversal::nextSibling<T>(*m_current);
return *this;
}
template <typename T>
inline RenderConstIterator<T>& RenderConstIterator<T>::traversePreviousSibling()
{
ASSERT(m_current);
m_current = RenderTraversal::previousSibling<T>(m_current);
return *this;
}
template <typename T>
inline RenderConstIterator<T>& RenderConstIterator<T>::traverseAncestor()
{
ASSERT(m_current);
ASSERT(m_current != m_root);
m_current = RenderTraversal::findAncestorOfType<const T>(*m_current);
return *this;
}
template <typename T>
inline const T& RenderConstIterator<T>::operator*() const
{
ASSERT(m_current);
return *m_current;
}
template <typename T>
inline const T* RenderConstIterator<T>::operator->() const
{
ASSERT(m_current);
return m_current;
}
template <typename T>
inline bool RenderConstIterator<T>::operator==(const RenderConstIterator& other) const
{
ASSERT(m_root == other.m_root);
return m_current == other.m_current;
}
template <typename T>
inline bool RenderConstIterator<T>::operator!=(const RenderConstIterator& other) const
{
return !(*this == other);
}
}
#include "RenderAncestorIterator.h"
#include "RenderChildIterator.h"
#endif