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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "RenderElement.h"
namespace WebCore {
class RenderText;
template <typename T>
class RenderIterator {
public:
RenderIterator(const RenderElement* root);
RenderIterator(const RenderElement* root, T* current);
T& operator*();
T* operator->();
operator bool() const { return m_current; }
bool operator==(const RenderIterator& other) const;
bool operator!=(const RenderIterator& other) const;
RenderIterator& traverseNext();
RenderIterator& traverseNextSibling();
RenderIterator& traverseNextSkippingChildren();
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;
operator bool() const { return m_current; }
bool operator==(const RenderConstIterator& other) const;
bool operator!=(const RenderConstIterator& other) const;
RenderConstIterator& traverseNext();
RenderConstIterator& traverseNextSibling();
RenderConstIterator& traverseNextSkippingChildren();
RenderConstIterator& traversePreviousSibling();
RenderConstIterator& traverseAncestor();
private:
const RenderElement* m_root;
const T* m_current;
};
// Similar to is<>() but without the static_assert() making sure the check is necessary.
template <typename T, typename U>
inline bool isRendererOfType(const U& renderer) { return TypeCastTraits<const T, const U>::isOfType(renderer); }
// Traversal helpers
namespace RenderObjectTraversal {
template <typename U>
inline RenderObject* firstChild(U& object)
{
return object.firstChild();
}
inline RenderObject* firstChild(RenderObject& object)
{
return object.firstChildSlow();
}
inline RenderObject* firstChild(RenderText&)
{
return nullptr;
}
inline RenderObject* nextAncestorSibling(RenderObject& current, const RenderObject* stayWithin)
{
for (auto* ancestor = current.parent(); ancestor; ancestor = ancestor->parent()) {
if (ancestor == stayWithin)
return nullptr;
if (auto* sibling = ancestor->nextSibling())
return sibling;
}
return nullptr;
}
template <typename U>
inline RenderObject* next(U& current, const RenderObject* stayWithin)
{
if (auto* child = firstChild(current))
return child;
if (&current == stayWithin)
return nullptr;
if (auto* sibling = current.nextSibling())
return sibling;
return nextAncestorSibling(current, stayWithin);
}
inline RenderObject* nextSkippingChildren(RenderObject& current, const RenderObject* stayWithin)
{
if (&current == stayWithin)
return nullptr;
if (auto* sibling = current.nextSibling())
return sibling;
return nextAncestorSibling(current, stayWithin);
}
}
namespace RenderTraversal {
template <typename T, typename U>
inline T* firstChild(U& current)
{
RenderObject* object = RenderObjectTraversal::firstChild(current);
while (object && !isRendererOfType<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<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<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<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<T>(*ancestor))
return static_cast<T*>(ancestor);
}
return nullptr;
}
template <typename T, typename U>
inline T* firstWithin(U& current)
{
auto* descendant = RenderObjectTraversal::firstChild(current);
while (descendant && !isRendererOfType<T>(*descendant))
descendant = RenderObjectTraversal::next(*descendant, &current);
return static_cast<T*>(descendant);
}
template <typename T, typename U>
inline T* next(U& current, const RenderObject* stayWithin)
{
auto* descendant = RenderObjectTraversal::next(current, stayWithin);
while (descendant && !isRendererOfType<T>(*descendant))
descendant = RenderObjectTraversal::next(*descendant, stayWithin);
return static_cast<T*>(descendant);
}
} // namespace WebCore::RenderTraversal
// RenderIterator
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>::traverseNext()
{
ASSERT(m_current);
m_current = RenderTraversal::next<T>(*m_current, m_root);
return *this;
}
template <typename T>
inline RenderIterator<T>& RenderIterator<T>::traverseNextSkippingChildren()
{
ASSERT(m_current);
m_current = RenderObjectTraversal::nextSkippingChildren(*m_current, m_root);
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);
}
// RenderConstIterator
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>::traverseNext()
{
ASSERT(m_current);
m_current = RenderTraversal::next<T>(*m_current, m_root);
return *this;
}
template <typename T>
inline RenderConstIterator<T>& RenderConstIterator<T>::traverseNextSkippingChildren()
{
ASSERT(m_current);
m_current = RenderObjectTraversal::nextSkippingChildren(*m_current, m_root);
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);
}
} // namespace WebCore
#include "RenderAncestorIterator.h"
#include "RenderChildIterator.h"