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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 "core/dom/VisitedLinkState.h"
#include "core/HTMLNames.h"
#include "core/dom/ElementTraversal.h"
#include "core/dom/shadow/ElementShadow.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "core/html/HTMLAnchorElement.h"
#include "core/svg/SVGURIReference.h"
#include "public/platform/Platform.h"
namespace blink {
static inline const AtomicString& linkAttribute(const Element& element) {
DCHECK(element.isLink());
if (element.isHTMLElement())
return element.fastGetAttribute(HTMLNames::hrefAttr);
DCHECK(element.isSVGElement());
return SVGURIReference::legacyHrefString(toSVGElement(element));
}
static inline LinkHash linkHashForElement(
const Element& element,
const AtomicString& attribute = AtomicString()) {
DCHECK(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) {}
static void invalidateStyleForAllLinksRecursively(
Node& rootNode,
bool invalidateVisitedLinkHashes) {
for (Node& node : NodeTraversal::startsAt(rootNode)) {
if (node.isLink()) {
if (invalidateVisitedLinkHashes && isHTMLAnchorElement(node))
toHTMLAnchorElement(node).invalidateCachedVisitedLinkHash();
toElement(node).pseudoStateChanged(CSSSelector::PseudoLink);
toElement(node).pseudoStateChanged(CSSSelector::PseudoVisited);
toElement(node).pseudoStateChanged(CSSSelector::PseudoAnyLink);
}
if (isShadowHost(&node)) {
for (ShadowRoot* root = node.youngestShadowRoot(); root;
root = root->olderShadowRoot())
invalidateStyleForAllLinksRecursively(*root,
invalidateVisitedLinkHashes);
}
}
}
void VisitedLinkState::invalidateStyleForAllLinks(
bool invalidateVisitedLinkHashes) {
if (!m_linksCheckedForVisitedState.isEmpty() && document().firstChild())
invalidateStyleForAllLinksRecursively(*document().firstChild(),
invalidateVisitedLinkHashes);
}
static void invalidateStyleForLinkRecursively(Node& rootNode,
LinkHash linkHash) {
for (Node& node : NodeTraversal::startsAt(rootNode)) {
if (node.isLink() && linkHashForElement(toElement(node)) == linkHash) {
toElement(node).pseudoStateChanged(CSSSelector::PseudoLink);
toElement(node).pseudoStateChanged(CSSSelector::PseudoVisited);
toElement(node).pseudoStateChanged(CSSSelector::PseudoAnyLink);
}
if (isShadowHost(&node))
for (ShadowRoot* root = node.youngestShadowRoot(); root;
root = root->olderShadowRoot())
invalidateStyleForLinkRecursively(*root, linkHash);
}
}
void VisitedLinkState::invalidateStyleForLink(LinkHash linkHash) {
if (m_linksCheckedForVisitedState.contains(linkHash) &&
document().firstChild())
invalidateStyleForLinkRecursively(*document().firstChild(), linkHash);
}
EInsideLink VisitedLinkState::determineLinkStateSlowCase(
const Element& element) {
DCHECK(element.isLink());
DCHECK(document().isActive());
DCHECK(document() == element.document());
const AtomicString& attribute = linkAttribute(element);
if (attribute.isNull())
return EInsideLink::kNotInsideLink; // 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 EInsideLink::kInsideVisitedLink;
if (LinkHash hash = linkHashForElement(element, attribute)) {
m_linksCheckedForVisitedState.add(hash);
if (Platform::current()->isLinkVisited(hash))
return EInsideLink::kInsideVisitedLink;
}
return EInsideLink::kInsideUnvisitedLink;
}
DEFINE_TRACE(VisitedLinkState) {
visitor->trace(m_document);
}
} // namespace blink
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