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27 #include "core/editing/SimplifyMarkupCommand.h"
29 #include "core/dom/NodeRenderStyle.h"
30 #include "core/dom/NodeTraversal.h"
31 #include "core/rendering/RenderInline.h"
32 #include "core/rendering/RenderObject.h"
33 #include "core/rendering/style/RenderStyle.h"
37 SimplifyMarkupCommand::SimplifyMarkupCommand(Document& document, Node* firstNode, Node* nodeAfterLast)
38 : CompositeEditCommand(document), m_firstNode(firstNode), m_nodeAfterLast(nodeAfterLast)
42 void SimplifyMarkupCommand::doApply()
44 ContainerNode* rootNode = m_firstNode->parentNode();
45 WillBeHeapVector<RefPtrWillBeMember<ContainerNode> > nodesToRemove;
47 // Walk through the inserted nodes, to see if there are elements that could be removed
48 // without affecting the style. The goal is to produce leaner markup even when starting
49 // from a verbose fragment.
50 // We look at inline elements as well as non top level divs that don't have attributes.
51 for (Node* node = m_firstNode.get(); node && node != m_nodeAfterLast; node = NodeTraversal::next(*node)) {
52 if (node->hasChildren() || (node->isTextNode() && node->nextSibling()))
55 ContainerNode* startingNode = node->parentNode();
58 RenderStyle* startingStyle = startingNode->renderStyle();
61 ContainerNode* currentNode = startingNode;
62 ContainerNode* topNodeWithStartingStyle = 0;
63 while (currentNode != rootNode) {
64 if (currentNode->parentNode() != rootNode && isRemovableBlock(currentNode))
65 nodesToRemove.append(currentNode);
67 currentNode = currentNode->parentNode();
71 if (!currentNode->renderer() || !currentNode->renderer()->isRenderInline() || toRenderInline(currentNode->renderer())->alwaysCreateLineBoxes())
74 if (currentNode->firstChild() != currentNode->lastChild()) {
75 topNodeWithStartingStyle = 0;
79 if (!currentNode->renderStyle()->visualInvalidationDiff(*startingStyle).hasDifference())
80 topNodeWithStartingStyle = currentNode;
83 if (topNodeWithStartingStyle) {
84 for (ContainerNode* node = startingNode; node != topNodeWithStartingStyle; node = node->parentNode())
85 nodesToRemove.append(node);
89 // we perform all the DOM mutations at once.
90 for (size_t i = 0; i < nodesToRemove.size(); ++i) {
91 // FIXME: We can do better by directly moving children from nodesToRemove[i].
92 int numPrunedAncestors = pruneSubsequentAncestorsToRemove(nodesToRemove, i);
93 if (numPrunedAncestors < 0)
95 removeNodePreservingChildren(nodesToRemove[i], AssumeContentIsAlwaysEditable);
96 i += numPrunedAncestors;
100 int SimplifyMarkupCommand::pruneSubsequentAncestorsToRemove(WillBeHeapVector<RefPtrWillBeMember<ContainerNode> >& nodesToRemove, size_t startNodeIndex)
102 size_t pastLastNodeToRemove = startNodeIndex + 1;
103 for (; pastLastNodeToRemove < nodesToRemove.size(); ++pastLastNodeToRemove) {
104 if (nodesToRemove[pastLastNodeToRemove - 1]->parentNode() != nodesToRemove[pastLastNodeToRemove])
106 ASSERT(nodesToRemove[pastLastNodeToRemove]->firstChild() == nodesToRemove[pastLastNodeToRemove]->lastChild());
109 ContainerNode* highestAncestorToRemove = nodesToRemove[pastLastNodeToRemove - 1].get();
110 RefPtrWillBeRawPtr<ContainerNode> parent = highestAncestorToRemove->parentNode();
111 if (!parent) // Parent has already been removed.
114 if (pastLastNodeToRemove == startNodeIndex + 1)
117 removeNode(nodesToRemove[startNodeIndex], AssumeContentIsAlwaysEditable);
118 insertNodeBefore(nodesToRemove[startNodeIndex], highestAncestorToRemove, AssumeContentIsAlwaysEditable);
119 removeNode(highestAncestorToRemove, AssumeContentIsAlwaysEditable);
121 return pastLastNodeToRemove - startNodeIndex - 1;
124 void SimplifyMarkupCommand::trace(Visitor* visitor)
126 visitor->trace(m_firstNode);
127 visitor->trace(m_nodeAfterLast);
128 CompositeEditCommand::trace(visitor);