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/*
* Copyright (C) 2012 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.
*/
#include "config.h"
#include "SimplifyMarkupCommand.h"
#include "NodeRenderStyle.h"
#include "NodeTraversal.h"
#include "RenderInline.h"
#include "RenderObject.h"
#include "RenderStyle.h"
namespace WebCore {
SimplifyMarkupCommand::SimplifyMarkupCommand(Ref<Document>&& document, Node* firstNode, Node* nodeAfterLast)
: CompositeEditCommand(WTFMove(document))
, m_firstNode(firstNode)
, m_nodeAfterLast(nodeAfterLast)
{
}
void SimplifyMarkupCommand::doApply()
{
RefPtr rootNode = m_firstNode->parentNode();
Vector<Ref<Node>> nodesToRemove;
protectedDocument()->updateLayoutIgnorePendingStylesheets();
// Walk through the inserted nodes, to see if there are elements that could be removed
// without affecting the style. The goal is to produce leaner markup even when starting
// from a verbose fragment.
// We look at inline elements as well as non top level divs that don't have attributes.
for (RefPtr node = m_firstNode.get(); node && node != m_nodeAfterLast; node = NodeTraversal::next(*node)) {
if (node->firstChild() || (node->isTextNode() && node->nextSibling()) || !node->parentNode())
continue;
RefPtr startingNode = node->parentNode();
auto* startingStyle = startingNode->renderStyle();
if (!startingStyle)
continue;
RefPtr currentNode = startingNode;
RefPtr<Node> topNodeWithStartingStyle;
while (currentNode != rootNode) {
// FIXME: The simplification algorithm should be rewritten to eliminate redundant
// parents in cases where the children affect rendered content, as observed with
// <span><picture></picture></span>.
if (currentNode->hasTagName(HTMLNames::pictureTag))
break;
if (currentNode->parentNode() != rootNode && isRemovableBlock(currentNode.get()))
nodesToRemove.append(*currentNode);
currentNode = currentNode->parentNode();
if (!currentNode)
break;
CheckedPtr renderInline = dynamicDowncast<RenderInline>(currentNode->renderer());
if (!renderInline || renderInline->mayAffectLayout())
continue;
if (currentNode->firstChild() != currentNode->lastChild()) {
topNodeWithStartingStyle = nullptr;
break;
}
OptionSet<StyleDifferenceContextSensitiveProperty> contextSensitiveProperties;
if (currentNode->renderStyle()->diff(*startingStyle, contextSensitiveProperties) == StyleDifference::Equal)
topNodeWithStartingStyle = currentNode;
}
if (topNodeWithStartingStyle) {
for (RefPtr node = startingNode; node && node != topNodeWithStartingStyle; node = node->parentNode())
nodesToRemove.append(*node);
}
}
// we perform all the DOM mutations at once.
for (size_t i = 0; i < nodesToRemove.size(); ++i) {
// FIXME: We can do better by directly moving children from nodesToRemove[i].
int numPrunedAncestors = pruneSubsequentAncestorsToRemove(nodesToRemove, i);
if (numPrunedAncestors < 0)
continue;
removeNodePreservingChildren(nodesToRemove[i], AssumeContentIsAlwaysEditable);
i += numPrunedAncestors;
}
}
int SimplifyMarkupCommand::pruneSubsequentAncestorsToRemove(Vector<Ref<Node>>& nodesToRemove, size_t startNodeIndex)
{
size_t pastLastNodeToRemove = startNodeIndex + 1;
for (; pastLastNodeToRemove < nodesToRemove.size(); ++pastLastNodeToRemove) {
if (nodesToRemove[pastLastNodeToRemove - 1]->parentNode() != nodesToRemove[pastLastNodeToRemove].ptr())
break;
if (nodesToRemove[pastLastNodeToRemove]->firstChild() != nodesToRemove[pastLastNodeToRemove]->lastChild())
break;
}
Ref highestAncestorToRemove = nodesToRemove[pastLastNodeToRemove - 1].get();
RefPtr parent = highestAncestorToRemove->parentNode();
if (!parent) // Parent has already been removed.
return -1;
if (pastLastNodeToRemove == startNodeIndex + 1)
return 0;
removeNode(nodesToRemove[startNodeIndex], AssumeContentIsAlwaysEditable);
insertNodeBefore(nodesToRemove[startNodeIndex].copyRef(), highestAncestorToRemove, AssumeContentIsAlwaysEditable);
removeNode(highestAncestorToRemove, AssumeContentIsAlwaysEditable);
return pastLastNodeToRemove - startNodeIndex - 1;
}
} // namespace WebCore
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