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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Copyright (C) Research In Motion Limited 2011. All rights reserved.
* 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 "core/dom/VisitedLinkState.h"
#include "core/HTMLNames.h"
#include "core/XLinkNames.h"
#include "core/dom/ElementTraversal.h"
#include "core/html/HTMLAnchorElement.h"
#include "public/platform/Platform.h"
namespace WebCore {
static inline const AtomicString& linkAttribute(const Element& element)
{
ASSERT(element.isLink());
if (element.isHTMLElement())
return element.fastGetAttribute(HTMLNames::hrefAttr);
ASSERT(element.isSVGElement());
return element.getAttribute(XLinkNames::hrefAttr);
}
static inline LinkHash linkHashForElement(const Element& element, const AtomicString& attribute = AtomicString())
{
ASSERT(attribute.isNull() || linkAttribute(element) == attribute);
if (isHTMLAnchorElement(element))
return toHTMLAnchorElement(element).visitedLinkHash();
return visitedLinkHash(element.document().baseURL(), attribute.isNull() ? linkAttribute(element) : attribute);
}
VisitedLinkState::VisitedLinkState(const Document& document)
: m_document(document)
{
}
void VisitedLinkState::invalidateStyleForAllLinks()
{
if (m_linksCheckedForVisitedState.isEmpty())
return;
for (Element* element = ElementTraversal::firstWithin(m_document); element; element = ElementTraversal::next(*element)) {
if (element->isLink())
element->setNeedsStyleRecalc(SubtreeStyleChange);
}
}
void VisitedLinkState::invalidateStyleForLink(LinkHash linkHash)
{
if (!m_linksCheckedForVisitedState.contains(linkHash))
return;
for (Element* element = ElementTraversal::firstWithin(m_document); element; element = ElementTraversal::next(*element)) {
if (element->isLink() && linkHashForElement(*element) == linkHash)
element->setNeedsStyleRecalc(SubtreeStyleChange);
}
}
EInsideLink VisitedLinkState::determineLinkStateSlowCase(const Element& element)
{
ASSERT(element.isLink());
ASSERT(m_document.isActive());
ASSERT(m_document == element.document());
const AtomicString& attribute = linkAttribute(element);
if (attribute.isNull())
return NotInsideLink; // This can happen for <img usemap>
// An empty attribute refers to the document itself which is always
// visited. It is useful to check this explicitly so that visited
// links can be tested in platform independent manner, without
// explicit support in the test harness.
if (attribute.isEmpty())
return InsideVisitedLink;
if (LinkHash hash = linkHashForElement(element, attribute)) {
m_linksCheckedForVisitedState.add(hash);
if (blink::Platform::current()->isLinkVisited(hash))
return InsideVisitedLink;
}
return InsideUnvisitedLink;
}
}
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