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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2001 Dirk Mueller (mueller (at) kde.org)
      5  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
      6  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
      7  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
      8  * Copyright (C) 2011 Google Inc. All rights reserved.
      9  *
     10  * This library is free software; you can redistribute it and/or
     11  * modify it under the terms of the GNU Library General Public
     12  * License as published by the Free Software Foundation; either
     13  * version 2 of the License, or (at your option) any later version.
     14  *
     15  * This library is distributed in the hope that it will be useful,
     16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     18  * Library General Public License for more details.
     19  *
     20  * You should have received a copy of the GNU Library General Public License
     21  * along with this library; see the file COPYING.LIB.  If not, write to
     22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     23  * Boston, MA 02110-1301, USA.
     24  */
     25 #include "config.h"
     26 #include "core/dom/TreeScopeAdopter.h"
     27 
     28 #include "core/accessibility/AXObjectCache.h"
     29 #include "core/dom/Attr.h"
     30 #include "core/dom/NodeRareData.h"
     31 #include "core/dom/NodeTraversal.h"
     32 #include "core/dom/shadow/ElementShadow.h"
     33 #include "core/dom/shadow/ShadowRoot.h"
     34 
     35 namespace blink {
     36 
     37 void TreeScopeAdopter::moveTreeToNewScope(Node& root) const
     38 {
     39     ASSERT(needsScopeChange());
     40 
     41 #if !ENABLE(OILPAN)
     42     oldScope().guardRef();
     43 #endif
     44 
     45     // If an element is moved from a document and then eventually back again the collection cache for
     46     // that element may contain stale data as changes made to it will have updated the DOMTreeVersion
     47     // of the document it was moved to. By increasing the DOMTreeVersion of the donating document here
     48     // we ensure that the collection cache will be invalidated as needed when the element is moved back.
     49     Document& oldDocument = oldScope().document();
     50     Document& newDocument = newScope().document();
     51     bool willMoveToNewDocument = oldDocument != newDocument;
     52     AXObjectCache* axObjectCache = oldDocument.existingAXObjectCache();
     53     if (willMoveToNewDocument)
     54         oldDocument.incDOMTreeVersion();
     55 
     56     for (Node* node = &root; node; node = NodeTraversal::next(*node, &root)) {
     57         updateTreeScope(*node);
     58 
     59         if (willMoveToNewDocument) {
     60             if (axObjectCache)
     61                 axObjectCache->remove(node);
     62             moveNodeToNewDocument(*node, oldDocument, newDocument);
     63         } else if (node->hasRareData()) {
     64             NodeRareData* rareData = node->rareData();
     65             if (rareData->nodeLists())
     66                 rareData->nodeLists()->adoptTreeScope();
     67         }
     68 
     69         if (!node->isElementNode())
     70             continue;
     71 
     72         if (node->hasSyntheticAttrChildNodes()) {
     73             WillBeHeapVector<RefPtrWillBeMember<Attr> >& attrs = *toElement(node)->attrNodeList();
     74             for (unsigned i = 0; i < attrs.size(); ++i)
     75                 moveTreeToNewScope(*attrs[i]);
     76         }
     77 
     78         for (ShadowRoot* shadow = node->youngestShadowRoot(); shadow; shadow = shadow->olderShadowRoot()) {
     79             shadow->setParentTreeScope(newScope());
     80             if (willMoveToNewDocument)
     81                 moveTreeToNewDocument(*shadow, oldDocument, newDocument);
     82         }
     83     }
     84 
     85 #if !ENABLE(OILPAN)
     86     oldScope().guardDeref();
     87 #endif
     88 }
     89 
     90 void TreeScopeAdopter::moveTreeToNewDocument(Node& root, Document& oldDocument, Document& newDocument) const
     91 {
     92     ASSERT(oldDocument != newDocument);
     93     for (Node* node = &root; node; node = NodeTraversal::next(*node, &root)) {
     94         moveNodeToNewDocument(*node, oldDocument, newDocument);
     95 
     96         if (node->hasSyntheticAttrChildNodes()) {
     97             WillBeHeapVector<RefPtrWillBeMember<Attr> >& attrs = *toElement(node)->attrNodeList();
     98             for (unsigned i = 0; i < attrs.size(); ++i)
     99                 moveTreeToNewDocument(*attrs[i], oldDocument, newDocument);
    100         }
    101 
    102         for (ShadowRoot* shadow = node->youngestShadowRoot(); shadow; shadow = shadow->olderShadowRoot())
    103             moveTreeToNewDocument(*shadow, oldDocument, newDocument);
    104     }
    105 }
    106 
    107 #if ENABLE(ASSERT)
    108 static bool didMoveToNewDocumentWasCalled = false;
    109 static Document* oldDocumentDidMoveToNewDocumentWasCalledWith = 0;
    110 
    111 void TreeScopeAdopter::ensureDidMoveToNewDocumentWasCalled(Document& oldDocument)
    112 {
    113     ASSERT(!didMoveToNewDocumentWasCalled);
    114     ASSERT_UNUSED(oldDocument, oldDocument == oldDocumentDidMoveToNewDocumentWasCalledWith);
    115     didMoveToNewDocumentWasCalled = true;
    116 }
    117 #endif
    118 
    119 inline void TreeScopeAdopter::updateTreeScope(Node& node) const
    120 {
    121     ASSERT(!node.isTreeScope());
    122     ASSERT(node.treeScope() == oldScope());
    123 #if !ENABLE(OILPAN)
    124     newScope().guardRef();
    125     oldScope().guardDeref();
    126 #endif
    127     node.setTreeScope(m_newScope);
    128 }
    129 
    130 inline void TreeScopeAdopter::moveNodeToNewDocument(Node& node, Document& oldDocument, Document& newDocument) const
    131 {
    132     ASSERT(oldDocument != newDocument);
    133 
    134     if (node.hasRareData()) {
    135         NodeRareData* rareData = node.rareData();
    136         if (rareData->nodeLists())
    137             rareData->nodeLists()->adoptDocument(oldDocument, newDocument);
    138     }
    139 
    140     oldDocument.moveNodeIteratorsToNewDocument(node, newDocument);
    141 
    142     if (node.isShadowRoot())
    143         toShadowRoot(node).setDocument(newDocument);
    144 
    145 #if ENABLE(ASSERT)
    146     didMoveToNewDocumentWasCalled = false;
    147     oldDocumentDidMoveToNewDocumentWasCalledWith = &oldDocument;
    148 #endif
    149 
    150     node.didMoveToNewDocument(oldDocument);
    151     ASSERT(didMoveToNewDocumentWasCalled);
    152 }
    153 
    154 }
    155