127 lines
4.3 KiB
C++
127 lines
4.3 KiB
C++
/*
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* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
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* (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
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* Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
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* Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
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* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
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* Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
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* Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
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* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
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* Copyright (C) Research In Motion Limited 2011. All rights reserved.
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* Copyright (C) 2012 Google Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "VisitedLinkState.h"
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#include "ElementIterator.h"
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#include "Frame.h"
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#include "HTMLAnchorElement.h"
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#include "Page.h"
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#include "SVGAElement.h"
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#include "SVGNames.h"
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#include "VisitedLinkStore.h"
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#include "XLinkNames.h"
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namespace WebCore {
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using namespace HTMLNames;
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inline static const AtomString* linkAttribute(const Element& element)
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{
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if (!element.isLink())
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return nullptr;
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if (element.isHTMLElement())
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return &element.attributeWithoutSynchronization(HTMLNames::hrefAttr);
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if (element.isSVGElement())
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return &element.getAttribute(SVGNames::hrefAttr, XLinkNames::hrefAttr);
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return nullptr;
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}
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VisitedLinkState::VisitedLinkState(Document& document)
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: m_document(document)
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{
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}
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void VisitedLinkState::invalidateStyleForAllLinks()
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{
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if (m_linksCheckedForVisitedState.isEmpty())
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return;
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for (auto& element : descendantsOfType<Element>(m_document)) {
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if (element.isLink())
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element.invalidateStyleForSubtree();
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}
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}
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inline static std::optional<SharedStringHash> linkHashForElement(const Element& element)
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{
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if (is<HTMLAnchorElement>(element))
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return downcast<HTMLAnchorElement>(element).visitedLinkHash();
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if (is<SVGAElement>(element))
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return downcast<SVGAElement>(element).visitedLinkHash();
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return std::nullopt;
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}
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void VisitedLinkState::invalidateStyleForLink(SharedStringHash linkHash)
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{
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if (!m_linksCheckedForVisitedState.contains(linkHash))
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return;
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for (auto& element : descendantsOfType<Element>(m_document)) {
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if (element.isLink() && linkHashForElement(element) == linkHash)
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element.invalidateStyleForSubtree();
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}
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}
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InsideLink VisitedLinkState::determineLinkStateSlowCase(const Element& element)
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{
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ASSERT(element.isLink());
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const AtomString* attribute = linkAttribute(element);
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if (!attribute || attribute->isNull())
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return InsideLink::NotInside;
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auto hashIfFound = linkHashForElement(element);
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if (!hashIfFound)
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return attribute->isEmpty() ? InsideLink::InsideVisited : InsideLink::InsideUnvisited;
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auto hash = *hashIfFound;
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// An empty href (hash==0) refers to the document itself which is always visited. It is useful to check this explicitly so
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// that visited links can be tested in platform independent manner, without explicit support in the test harness.
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if (!hash)
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return InsideLink::InsideVisited;
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Frame* frame = element.document().frame();
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if (!frame)
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return InsideLink::InsideUnvisited;
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Page* page = frame->page();
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if (!page)
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return InsideLink::InsideUnvisited;
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m_linksCheckedForVisitedState.add(hash);
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if (!page->visitedLinkStore().isLinkVisited(*page, hash, element.document().baseURL(), *attribute))
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return InsideLink::InsideUnvisited;
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return InsideLink::InsideVisited;
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}
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} // namespace WebCore
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