ContainerNodeAlgorithms.cpp   [plain text]

/*
 * 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) 2012 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 "config.h"
#include "ContainerNodeAlgorithms.h"

#include "Element.h"
#include "ElementShadow.h"
#include "HTMLFrameOwnerElement.h"

namespace WebCore {

void ChildNodeInsertionNotifier::notifyDescendantInsertedIntoDocument(ContainerNode* node)
{
    ChildNodesLazySnapshot snapshot(node);
    while (RefPtr<Node> child = snapshot.nextNode()) {
        // If we have been removed from the document during this loop, then
        // we don't want to tell the rest of our children that they've been
        // inserted into the document because they haven't.
        if (node->inDocument() && child->parentNode() == node)
            notifyNodeInsertedIntoDocument(child.get());
    }

    if (!node->isElementNode())
        return;

    if (ElementShadow* shadow = toElement(node)->shadow()) {
        if (RefPtr<ShadowRoot> root = shadow->shadowRoot()) {
            if (node->inDocument() && root->host() == node)
                notifyNodeInsertedIntoDocument(root.get());
        }
    }
}

void ChildNodeInsertionNotifier::notifyDescendantInsertedIntoTree(ContainerNode* node)
{
    for (Node* child = node->firstChild(); child; child = child->nextSibling()) {
        if (child->isContainerNode())
            notifyNodeInsertedIntoTree(toContainerNode(child));
    }

    if (ShadowRoot* root = node->shadowRoot())
        notifyNodeInsertedIntoTree(root);
}

void ChildNodeRemovalNotifier::notifyDescendantRemovedFromDocument(ContainerNode* node)
{
    ChildNodesLazySnapshot snapshot(node);
    while (RefPtr<Node> child = snapshot.nextNode()) {
        // If we have been added to the document during this loop, then we
        // don't want to tell the rest of our children that they've been
        // removed from the document because they haven't.
        if (!node->inDocument() && child->parentNode() == node)
            notifyNodeRemovedFromDocument(child.get());
    }

    if (!node->isElementNode())
        return;

    if (node->document()->cssTarget() == node)
        node->document()->setCSSTarget(0);

    if (ElementShadow* shadow = toElement(node)->shadow()) {
        if (RefPtr<ShadowRoot> root = shadow->shadowRoot()) {
            if (!node->inDocument() && root->host() == node)
                notifyNodeRemovedFromDocument(root.get());
        }
    }
}

void ChildNodeRemovalNotifier::notifyDescendantRemovedFromTree(ContainerNode* node)
{
    for (Node* child = node->firstChild(); child; child = child->nextSibling()) {
        if (child->isContainerNode())
            notifyNodeRemovedFromTree(toContainerNode(child));
    }

    if (!node->isElementNode())
        return;

    if (ElementShadow* shadow = toElement(node)->shadow()) {
        if (RefPtr<ShadowRoot> root = shadow->shadowRoot())
            notifyNodeRemovedFromTree(root.get());
    }
}

void ChildFrameDisconnector::collectFrameOwners(ElementShadow* shadow)
{
    if (ShadowRoot* root = shadow->shadowRoot())
        collectFrameOwners(root);
}

#ifndef NDEBUG
unsigned assertConnectedSubrameCountIsConsistent(Node* node)
{
    unsigned count = 0;

    if (node->isElementNode()) {
        if (node->isFrameOwnerElement() && toFrameOwnerElement(node)->contentFrame())
            count++;

        if (ElementShadow* shadow = toElement(node)->shadow()) {
            if (ShadowRoot* root = shadow->shadowRoot())
                count += assertConnectedSubrameCountIsConsistent(root);
        }
    }

    for (Node* child = node->firstChild(); child; child = child->nextSibling())
        count += assertConnectedSubrameCountIsConsistent(child);

    // If we undercount there's possibly a security bug since we'd leave frames
    // in subtrees outside the document.
    ASSERT(node->connectedSubframeCount() >= count);

    // If we overcount it's safe, but not optimal because it means we'll traverse
    // through the document in ChildFrameDisconnector looking for frames that have
    // already been disconnected.
    ASSERT(node->connectedSubframeCount() == count);

    return count;
}
#endif

}