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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 Apple Inc. All
* rights reserved.
* Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
* (http://www.torchmobile.com/)
* Copyright (C) 2011 Google Inc. All rights reserved.
*
* 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.
*/
#include "core/dom/TreeScopeAdopter.h"
#include "core/dom/Attr.h"
#include "core/dom/Node.h"
#include "core/dom/NodeRareData.h"
#include "core/dom/NodeTraversal.h"
#include "core/dom/custom/CustomElement.h"
#include "core/dom/shadow/ElementShadow.h"
#include "core/dom/shadow/ShadowRoot.h"
namespace blink {
void TreeScopeAdopter::execute() const {
moveTreeToNewScope(*m_toAdopt);
Document& oldDocument = oldScope().document();
if (oldDocument == newScope().document())
return;
oldDocument.didMoveTreeToNewDocument(*m_toAdopt);
}
void TreeScopeAdopter::moveTreeToNewScope(Node& root) const {
DCHECK(needsScopeChange());
// If an element is moved from a document and then eventually back again the
// collection cache for that element may contain stale data as changes made to
// it will have updated the DOMTreeVersion of the document it was moved to. By
// increasing the DOMTreeVersion of the donating document here we ensure that
// the collection cache will be invalidated as needed when the element is
// moved back.
Document& oldDocument = oldScope().document();
Document& newDocument = newScope().document();
bool willMoveToNewDocument = oldDocument != newDocument;
for (Node& node : NodeTraversal::inclusiveDescendantsOf(root)) {
updateTreeScope(node);
if (willMoveToNewDocument) {
moveNodeToNewDocument(node, oldDocument, newDocument);
} else if (node.hasRareData()) {
NodeRareData* rareData = node.rareData();
if (rareData->nodeLists())
rareData->nodeLists()->adoptTreeScope();
}
if (!node.isElementNode())
continue;
Element& element = toElement(node);
if (HeapVector<Member<Attr>>* attrs = element.attrNodeList()) {
for (const auto& attr : *attrs)
moveTreeToNewScope(*attr);
}
for (ShadowRoot* shadow = element.youngestShadowRoot(); shadow;
shadow = shadow->olderShadowRoot()) {
shadow->setParentTreeScope(newScope());
if (willMoveToNewDocument)
moveTreeToNewDocument(*shadow, oldDocument, newDocument);
}
}
}
void TreeScopeAdopter::moveTreeToNewDocument(Node& root,
Document& oldDocument,
Document& newDocument) const {
DCHECK_NE(oldDocument, newDocument);
for (Node& node : NodeTraversal::inclusiveDescendantsOf(root)) {
moveNodeToNewDocument(node, oldDocument, newDocument);
if (!node.isElementNode())
continue;
Element& element = toElement(node);
if (HeapVector<Member<Attr>>* attrs = element.attrNodeList()) {
for (const auto& attr : *attrs)
moveTreeToNewDocument(*attr, oldDocument, newDocument);
}
for (ShadowRoot* shadow = element.youngestShadowRoot(); shadow;
shadow = shadow->olderShadowRoot())
moveTreeToNewDocument(*shadow, oldDocument, newDocument);
}
}
#if DCHECK_IS_ON()
static bool didMoveToNewDocumentWasCalled = false;
static Document* oldDocumentDidMoveToNewDocumentWasCalledWith = 0;
void TreeScopeAdopter::ensureDidMoveToNewDocumentWasCalled(
Document& oldDocument) {
DCHECK(!didMoveToNewDocumentWasCalled);
DCHECK_EQ(oldDocument, oldDocumentDidMoveToNewDocumentWasCalledWith);
didMoveToNewDocumentWasCalled = true;
}
#endif
inline void TreeScopeAdopter::updateTreeScope(Node& node) const {
DCHECK(!node.isTreeScope());
DCHECK(node.treeScope() == oldScope());
node.setTreeScope(m_newScope);
}
inline void TreeScopeAdopter::moveNodeToNewDocument(
Node& node,
Document& oldDocument,
Document& newDocument) const {
DCHECK_NE(oldDocument, newDocument);
// Note: at the start of this function, node.document() may already have
// changed to match |newDocument|, which is why |oldDocument| is passed in.
if (node.hasRareData()) {
NodeRareData* rareData = node.rareData();
if (rareData->nodeLists())
rareData->nodeLists()->adoptDocument(oldDocument, newDocument);
}
node.willMoveToNewDocument(oldDocument, newDocument);
oldDocument.moveNodeIteratorsToNewDocument(node, newDocument);
if (node.getCustomElementState() == CustomElementState::Custom) {
Element& element = toElement(node);
CustomElement::enqueueAdoptedCallback(&element, &oldDocument, &newDocument);
}
if (node.isShadowRoot())
toShadowRoot(node).setDocument(newDocument);
#if DCHECK_IS_ON()
didMoveToNewDocumentWasCalled = false;
oldDocumentDidMoveToNewDocumentWasCalledWith = &oldDocument;
#endif
node.didMoveToNewDocument(oldDocument);
#if DCHECK_IS_ON()
DCHECK(didMoveToNewDocumentWasCalled);
#endif
}
} // namespace blink
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