1 /*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
4 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
5 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
6 * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
7 * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
8 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
9 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
10 * Copyright (C) Research In Motion Limited 2011. All rights reserved.
11 * Copyright (C) 2012 Google Inc. All rights reserved.
12 *
13 * This library is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU Library General Public
15 * License as published by the Free Software Foundation; either
16 * version 2 of the License, or (at your option) any later version.
17 *
18 * This library is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * Library General Public License for more details.
22 *
23 * You should have received a copy of the GNU Library General Public License
24 * along with this library; see the file COPYING.LIB. If not, write to
25 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
26 * Boston, MA 02110-1301, USA.
27 */
28
29 #include "config.h"
30 #include "core/dom/VisitedLinkState.h"
31
32 #include "HTMLNames.h"
33 #include "XLinkNames.h"
34 #include "core/dom/ElementTraversal.h"
35 #include "core/html/HTMLAnchorElement.h"
36 #include "public/platform/Platform.h"
37
38 namespace WebCore {
39
linkAttribute(const Element & element)40 static inline const AtomicString& linkAttribute(const Element& element)
41 {
42 ASSERT(element.isLink());
43 if (element.isHTMLElement())
44 return element.fastGetAttribute(HTMLNames::hrefAttr);
45 ASSERT(element.isSVGElement());
46 return element.getAttribute(XLinkNames::hrefAttr);
47 }
48
linkHashForElement(const Element & element,const AtomicString & attribute=AtomicString ())49 static inline LinkHash linkHashForElement(const Element& element, const AtomicString& attribute = AtomicString())
50 {
51 ASSERT(attribute.isNull() || linkAttribute(element) == attribute);
52 if (isHTMLAnchorElement(element))
53 return toHTMLAnchorElement(element).visitedLinkHash();
54 return visitedLinkHash(element.document().baseURL(), attribute.isNull() ? linkAttribute(element) : attribute);
55 }
56
VisitedLinkState(const Document & document)57 VisitedLinkState::VisitedLinkState(const Document& document)
58 : m_document(document)
59 {
60 }
61
invalidateStyleForAllLinks()62 void VisitedLinkState::invalidateStyleForAllLinks()
63 {
64 if (m_linksCheckedForVisitedState.isEmpty())
65 return;
66 for (Element* element = ElementTraversal::firstWithin(m_document); element; element = ElementTraversal::next(*element)) {
67 if (element->isLink())
68 element->setNeedsStyleRecalc();
69 }
70 }
71
invalidateStyleForLink(LinkHash linkHash)72 void VisitedLinkState::invalidateStyleForLink(LinkHash linkHash)
73 {
74 if (!m_linksCheckedForVisitedState.contains(linkHash))
75 return;
76 for (Element* element = ElementTraversal::firstWithin(m_document); element; element = ElementTraversal::next(*element)) {
77 if (element->isLink() && linkHashForElement(*element) == linkHash)
78 element->setNeedsStyleRecalc();
79 }
80 }
81
determineLinkStateSlowCase(const Element & element)82 EInsideLink VisitedLinkState::determineLinkStateSlowCase(const Element& element)
83 {
84 ASSERT(element.isLink());
85 ASSERT(m_document.isActive());
86 ASSERT(m_document == element.document());
87
88 const AtomicString& attribute = linkAttribute(element);
89
90 if (attribute.isNull())
91 return NotInsideLink; // This can happen for <img usemap>
92
93 // An empty attribute refers to the document itself which is always
94 // visited. It is useful to check this explicitly so that visited
95 // links can be tested in platform independent manner, without
96 // explicit support in the test harness.
97 if (attribute.isEmpty())
98 return InsideVisitedLink;
99
100 if (LinkHash hash = linkHashForElement(element, attribute)) {
101 m_linksCheckedForVisitedState.add(hash);
102 if (blink::Platform::current()->isLinkVisited(hash))
103 return InsideVisitedLink;
104 }
105
106 return InsideUnvisitedLink;
107 }
108
109 }
110