1/*
2 * Copyright (C) 2012 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32#include "core/html/shadow/HTMLShadowElement.h"
33
34#include "HTMLNames.h"
35#include "core/dom/shadow/ShadowRoot.h"
36
37namespace WebCore {
38
39class Document;
40
41inline HTMLShadowElement::HTMLShadowElement(const QualifiedName& tagName, Document* document)
42    : InsertionPoint(tagName, document)
43{
44    ASSERT(hasTagName(HTMLNames::shadowTag));
45    ScriptWrappable::init(this);
46}
47
48PassRefPtr<HTMLShadowElement> HTMLShadowElement::create(const QualifiedName& tagName, Document* document)
49{
50    return adoptRef(new HTMLShadowElement(tagName, document));
51}
52
53HTMLShadowElement::~HTMLShadowElement()
54{
55}
56
57ShadowRoot* HTMLShadowElement::olderShadowRoot()
58{
59    ShadowRoot* containingRoot = containingShadowRoot();
60    if (!containingRoot)
61        return 0;
62
63    document()->updateDistributionForNodeIfNeeded(this);
64
65    ShadowRoot* older = containingRoot->olderShadowRoot();
66    if (!older || !older->shouldExposeToBindings() || older->insertionPoint() != this)
67        return 0;
68
69    ASSERT(older->shouldExposeToBindings());
70    return older;
71}
72
73static inline Element* hostForOldestAuthorShadowRoot(ShadowRoot* root)
74{
75    return root && root->isOldestAuthorShadowRoot() ? root->host() : 0;
76}
77
78bool HTMLShadowElement::shouldSelect() const
79{
80    Element* host = hostForOldestAuthorShadowRoot(containingShadowRoot());
81    return !host || host->supportsShadowElementForUserAgentShadow();
82}
83
84Node::InsertionNotificationRequest HTMLShadowElement::insertedInto(ContainerNode* insertionPoint)
85{
86    if (insertionPoint->inDocument() && !shouldSelect()) {
87        String message = String::format("<shadow> doesn't work for %s element host.", containingShadowRoot()->host()->nodeName().utf8().data());
88        document()->addConsoleMessage(RenderingMessageSource, WarningMessageLevel, message);
89    }
90    return InsertionPoint::insertedInto(insertionPoint);
91}
92
93} // namespace WebCore
94
95