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/*
* Copyright (C) 2012 Google 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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.
*/
#ifndef ComposedTreeTraversal_h
#define ComposedTreeTraversal_h
#include "core/dom/NodeRenderingTraversal.h"
#include "core/dom/shadow/InsertionPoint.h"
#include "core/dom/shadow/ShadowRoot.h"
namespace blink {
class ContainerNode;
class Node;
// FIXME: Make some functions inline to optimise the performance.
// https://bugs.webkit.org/show_bug.cgi?id=82702
class ComposedTreeTraversal {
public:
typedef NodeRenderingTraversal::ParentDetails ParentTraversalDetails;
static Node* next(const Node&);
static Node* previous(const Node&);
static Node* firstChild(const Node&);
static Node* lastChild(const Node&);
static ContainerNode* parent(const Node&, ParentTraversalDetails* = 0);
static Node* nextSibling(const Node&);
static Node* previousSibling(const Node&);
private:
enum TraversalDirection {
TraversalDirectionForward,
TraversalDirectionBackward
};
static void assertPrecondition(const Node& node)
{
#if ENABLE(ASSERT)
ASSERT(node.canParticipateInComposedTree());
#endif
}
static void assertPostcondition(const Node* node)
{
#if ENABLE(ASSERT)
if (node)
assertPrecondition(*node);
#endif
}
static Node* traverseNode(const Node&, TraversalDirection);
static Node* traverseLightChildren(const Node&, TraversalDirection);
static Node* traverseNext(const Node&);
static Node* traversePrevious(const Node&);
static Node* traverseFirstChild(const Node&);
static Node* traverseLastChild(const Node&);
static Node* traverseChild(const Node&, TraversalDirection);
static ContainerNode* traverseParent(const Node&, ParentTraversalDetails* = 0);
static Node* traverseNextSibling(const Node&);
static Node* traversePreviousSibling(const Node&);
static Node* traverseSiblingOrBackToInsertionPoint(const Node&, TraversalDirection);
static Node* traverseSiblingInCurrentTree(const Node&, TraversalDirection);
static Node* traverseSiblings(const Node*, TraversalDirection);
static Node* traverseDistributedNodes(const Node*, const InsertionPoint&, TraversalDirection);
static Node* traverseBackToYoungerShadowRoot(const Node&, TraversalDirection);
static ContainerNode* traverseParentOrHost(const Node&);
};
inline ContainerNode* ComposedTreeTraversal::parent(const Node& node, ParentTraversalDetails* details)
{
assertPrecondition(node);
ContainerNode* result = traverseParent(node, details);
assertPostcondition(result);
return result;
}
inline Node* ComposedTreeTraversal::nextSibling(const Node& node)
{
assertPrecondition(node);
Node* result = traverseSiblingOrBackToInsertionPoint(node, TraversalDirectionForward);
assertPostcondition(result);
return result;
}
inline Node* ComposedTreeTraversal::previousSibling(const Node& node)
{
assertPrecondition(node);
Node* result = traverseSiblingOrBackToInsertionPoint(node, TraversalDirectionBackward);
assertPostcondition(result);
return result;
}
inline Node* ComposedTreeTraversal::next(const Node& node)
{
assertPrecondition(node);
Node* result = traverseNext(node);
assertPostcondition(result);
return result;
}
inline Node* ComposedTreeTraversal::traverseNext(const Node& node)
{
if (Node* next = traverseFirstChild(node))
return next;
for (const Node* next = &node; next; next = traverseParent(*next)) {
if (Node* sibling = traverseNextSibling(*next))
return sibling;
}
return 0;
}
inline Node* ComposedTreeTraversal::previous(const Node& node)
{
assertPrecondition(node);
Node* result = traversePrevious(node);
assertPostcondition(result);
return result;
}
inline Node* ComposedTreeTraversal::traversePrevious(const Node& node)
{
if (Node* previous = traversePreviousSibling(node)) {
while (Node* child = traverseLastChild(*previous))
previous = child;
return previous;
}
return traverseParent(node);
}
inline Node* ComposedTreeTraversal::firstChild(const Node& node)
{
assertPrecondition(node);
Node* result = traverseChild(node, TraversalDirectionForward);
assertPostcondition(result);
return result;
}
inline Node* ComposedTreeTraversal::lastChild(const Node& node)
{
assertPrecondition(node);
Node* result = traverseLastChild(node);
assertPostcondition(result);
return result;
}
inline Node* ComposedTreeTraversal::traverseNextSibling(const Node& node)
{
return traverseSiblingOrBackToInsertionPoint(node, TraversalDirectionForward);
}
inline Node* ComposedTreeTraversal::traversePreviousSibling(const Node& node)
{
return traverseSiblingOrBackToInsertionPoint(node, TraversalDirectionBackward);
}
inline Node* ComposedTreeTraversal::traverseFirstChild(const Node& node)
{
return traverseChild(node, TraversalDirectionForward);
}
inline Node* ComposedTreeTraversal::traverseLastChild(const Node& node)
{
return traverseChild(node, TraversalDirectionBackward);
}
} // namespace
#endif
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