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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 "VisitedLinkState.h"
#include "Frame.h"
#include "HTMLAnchorElement.h"
#include "HTMLNames.h"
#include "NodeTraversal.h"
#include "Page.h"
#include "PageGroup.h"
#include "PlatformStrategies.h"
#include "VisitedLinkStrategy.h"
namespace WebCore {
using namespace HTMLNames;
inline static const AtomicString* linkAttribute(Element* element)
{
if (!element->isLink())
return 0;
if (element->isHTMLElement())
return &element->fastGetAttribute(HTMLNames::hrefAttr);
if (element->isSVGElement())
return &element->getAttribute(XLinkNames::hrefAttr);
return 0;
}
PassOwnPtr<VisitedLinkState> VisitedLinkState::create(Document* document)
{
return adoptPtr(new VisitedLinkState(document));
}
VisitedLinkState::VisitedLinkState(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();
}
}
inline static LinkHash linkHashForElement(Document* document, Element* element)
{
if (isHTMLAnchorElement(element))
return toHTMLAnchorElement(element)->visitedLinkHash();
if (const AtomicString* attribute = linkAttribute(element))
return WebCore::visitedLinkHash(document->baseURL(), *attribute);
return 0;
}
void VisitedLinkState::invalidateStyleForLink(LinkHash linkHash)
{
if (!m_linksCheckedForVisitedState.contains(linkHash))
return;
for (Element* element = ElementTraversal::firstWithin(m_document); element; element = ElementTraversal::next(element)) {
if (linkHashForElement(m_document, element) == linkHash)
element->setNeedsStyleRecalc();
}
}
EInsideLink VisitedLinkState::determineLinkStateSlowCase(Element* element)
{
ASSERT(element->isLink());
const AtomicString* attribute = linkAttribute(element);
if (!attribute || attribute->isNull())
return NotInsideLink;
// An empty href 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;
LinkHash hash;
if (isHTMLAnchorElement(element))
hash = toHTMLAnchorElement(element)->visitedLinkHash();
else
hash = WebCore::visitedLinkHash(element->document()->baseURL(), *attribute);
if (!hash)
return InsideUnvisitedLink;
Frame* frame = element->document()->frame();
if (!frame)
return InsideUnvisitedLink;
Page* page = frame->page();
if (!page)
return InsideUnvisitedLink;
m_linksCheckedForVisitedState.add(hash);
return platformStrategies()->visitedLinkStrategy()->isLinkVisited(page, hash, element->document()->baseURL(), *attribute) ? InsideVisitedLink : InsideUnvisitedLink;
}
}
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