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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 "ElementIterator.h"
#include "FrameDestructionObserverInlines.h"
#include "HTMLAnchorElementInlines.h"
#include "LocalFrame.h"
#include "Page.h"
#include "SVGAElement.h"
#include "SVGElementTypeHelpers.h"
#include "SVGNames.h"
#include "TypedElementDescendantIteratorInlines.h"
#include "VisitedLinkStore.h"
#include "XLinkNames.h"
#include <wtf/TZoneMallocInlines.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(VisitedLinkState);
using namespace HTMLNames;
inline static const AtomString linkAttribute(const Element& element)
{
if (!element.isLink())
return nullAtom();
if (element.isHTMLElement())
return element.attributeWithoutSynchronization(HTMLNames::hrefAttr);
if (element.isSVGElement())
return element.getAttribute(SVGNames::hrefAttr, XLinkNames::hrefAttr);
return nullAtom();
}
VisitedLinkState::VisitedLinkState(Document& document)
: m_document(document)
{
}
void VisitedLinkState::invalidateStyleForAllLinks()
{
if (m_linksCheckedForVisitedState.isEmpty())
return;
Ref document = m_document.get();
for (Ref element : descendantsOfType<Element>(document.get())) {
if (element->isLink())
element->invalidateStyleForSubtree();
}
}
inline static std::optional<SharedStringHash> linkHashForElement(const Element& element)
{
if (auto anchor = dynamicDowncast<HTMLAnchorElement>(element))
return anchor->visitedLinkHash();
if (auto anchor = dynamicDowncast<SVGAElement>(element))
return anchor->visitedLinkHash();
return std::nullopt;
}
void VisitedLinkState::invalidateStyleForLink(SharedStringHash linkHash)
{
if (!m_linksCheckedForVisitedState.contains(linkHash))
return;
Ref document = m_document.get();
for (Ref element : descendantsOfType<Element>(document.get())) {
if (element->isLink() && linkHashForElement(element) == linkHash)
element->invalidateStyleForSubtree();
}
}
InsideLink VisitedLinkState::determineLinkStateSlowCase(const Element& element)
{
ASSERT(element.isLink());
auto attribute = linkAttribute(element);
if (attribute.isNull())
return InsideLink::NotInside;
auto hashIfFound = linkHashForElement(element);
if (!hashIfFound)
return attribute.isEmpty() ? InsideLink::InsideVisited : InsideLink::InsideUnvisited;
auto hash = *hashIfFound;
// An empty href (hash==0) 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 (!hash)
return InsideLink::InsideVisited;
RefPtr frame = element.document().frame();
if (!frame)
return InsideLink::InsideUnvisited;
RefPtr page = frame->page();
if (!page)
return InsideLink::InsideUnvisited;
m_linksCheckedForVisitedState.add(hash);
if (!page->visitedLinkStore().isLinkVisited(*page, hash, element.document().baseURL(), attribute))
return InsideLink::InsideUnvisited;
return InsideLink::InsideVisited;
}
} // namespace WebCore
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