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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef NodeTraversal_h
#define NodeTraversal_h
#include "ContainerNode.h"
#include "Text.h"
namespace WebCore {
namespace NodeTraversal {
// Does a pre-order traversal of the tree to find the next node after this one.
// This uses the same order that tags appear in the source file. If the stayWithin
// argument is non-null, the traversal will stop once the specified node is reached.
// This can be used to restrict traversal to a particular sub-tree.
Node* next(const Node*);
Node* next(const Node*, const Node* stayWithin);
Node* next(const ContainerNode*);
Node* next(const ContainerNode*, const Node* stayWithin);
Node* next(const Text*);
Node* next(const Text*, const Node* stayWithin);
// Like next, but skips children and starts with the next sibling.
Node* nextSkippingChildren(const Node*);
Node* nextSkippingChildren(const Node*, const Node* stayWithin);
Node* nextSkippingChildren(const ContainerNode*);
Node* nextSkippingChildren(const ContainerNode*, const Node* stayWithin);
// Does a reverse pre-order traversal to find the node that comes before the current one in document order
Node* last(const ContainerNode*);
Node* previous(const Node*, const Node* stayWithin = 0);
// Like previous, but skips children and starts with the next sibling.
Node* previousSkippingChildren(const Node*, const Node* stayWithin = 0);
// Like next, but visits parents after their children.
Node* nextPostOrder(const Node*, const Node* stayWithin = 0);
// Like previous/previousSkippingChildren, but visits parents before their children.
Node* previousPostOrder(const Node*, const Node* stayWithin = 0);
Node* previousSkippingChildrenPostOrder(const Node*, const Node* stayWithin = 0);
// Pre-order traversal including the pseudo-elements.
Node* previousIncludingPseudo(const Node*, const Node* = 0);
Node* nextIncludingPseudo(const Node*, const Node* = 0);
Node* nextIncludingPseudoSkippingChildren(const Node*, const Node* = 0);
}
namespace NodeTraversal {
Node* nextAncestorSibling(const Node*);
Node* nextAncestorSibling(const Node*, const Node* stayWithin);
Node* deepLastChild(Node*);
template <class NodeType>
inline Node* traverseNextTemplate(NodeType* current)
{
if (current->firstChild())
return current->firstChild();
if (current->nextSibling())
return current->nextSibling();
return nextAncestorSibling(current);
}
inline Node* next(const Node* current) { return traverseNextTemplate(current); }
inline Node* next(const ContainerNode* current) { return traverseNextTemplate(current); }
template <class NodeType>
inline Node* traverseNextTemplate(NodeType* current, const Node* stayWithin)
{
if (current->firstChild())
return current->firstChild();
if (current == stayWithin)
return 0;
if (current->nextSibling())
return current->nextSibling();
return nextAncestorSibling(current, stayWithin);
}
inline Node* next(const Node* current, const Node* stayWithin) { return traverseNextTemplate(current, stayWithin); }
inline Node* next(const ContainerNode* current, const Node* stayWithin) { return traverseNextTemplate(current, stayWithin); }
template <class NodeType>
inline Node* traverseNextSkippingChildrenTemplate(NodeType* current)
{
if (current->nextSibling())
return current->nextSibling();
return nextAncestorSibling(current);
}
inline Node* nextSkippingChildren(const Node* current) { return traverseNextSkippingChildrenTemplate(current); }
inline Node* nextSkippingChildren(const ContainerNode* current) { return traverseNextSkippingChildrenTemplate(current); }
template <class NodeType>
inline Node* traverseNextSkippingChildrenTemplate(NodeType* current, const Node* stayWithin)
{
if (current == stayWithin)
return 0;
if (current->nextSibling())
return current->nextSibling();
return nextAncestorSibling(current, stayWithin);
}
inline Node* nextSkippingChildren(const Node* current, const Node* stayWithin) { return traverseNextSkippingChildrenTemplate(current, stayWithin); }
inline Node* nextSkippingChildren(const ContainerNode* current, const Node* stayWithin) { return traverseNextSkippingChildrenTemplate(current, stayWithin); }
inline Node* next(const Text* current) { return traverseNextSkippingChildrenTemplate(current); }
inline Node* next(const Text* current, const Node* stayWithin) { return traverseNextSkippingChildrenTemplate(current, stayWithin); }
inline Node* previous(const Node* current, const Node* stayWithin)
{
if (Node* previous = current->previousSibling())
return deepLastChild(previous);
if (current->parentNode() == stayWithin)
return nullptr;
return current->parentNode();
}
}
}
#endif
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