1/* 2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org) 3 * (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com) 4 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com) 5 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. 6 * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org> 7 * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org> 8 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) 9 * Copyright (c) 2011, Code Aurora Forum. All rights reserved. 10 * Copyright (C) Research In Motion Limited 2011. All rights reserved. 11 * Copyright (C) 2012 Google Inc. All rights reserved. 12 * 13 * This library is free software; you can redistribute it and/or 14 * modify it under the terms of the GNU Library General Public 15 * License as published by the Free Software Foundation; either 16 * version 2 of the License, or (at your option) any later version. 17 * 18 * This library is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 21 * Library General Public License for more details. 22 * 23 * You should have received a copy of the GNU Library General Public License 24 * along with this library; see the file COPYING.LIB. If not, write to 25 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 26 * Boston, MA 02110-1301, USA. 27 */ 28 29#include "config.h" 30#include "core/dom/VisitedLinkState.h" 31 32#include "core/HTMLNames.h" 33#include "core/XLinkNames.h" 34#include "core/dom/ElementTraversal.h" 35#include "core/html/HTMLAnchorElement.h" 36#include "public/platform/Platform.h" 37 38namespace blink { 39 40static inline const AtomicString& linkAttribute(const Element& element) 41{ 42 ASSERT(element.isLink()); 43 if (element.isHTMLElement()) 44 return element.fastGetAttribute(HTMLNames::hrefAttr); 45 ASSERT(element.isSVGElement()); 46 return element.getAttribute(XLinkNames::hrefAttr); 47} 48 49static inline LinkHash linkHashForElement(const Element& element, const AtomicString& attribute = AtomicString()) 50{ 51 ASSERT(attribute.isNull() || linkAttribute(element) == attribute); 52 if (isHTMLAnchorElement(element)) 53 return toHTMLAnchorElement(element).visitedLinkHash(); 54 return visitedLinkHash(element.document().baseURL(), attribute.isNull() ? linkAttribute(element) : attribute); 55} 56 57VisitedLinkState::VisitedLinkState(const Document& document) 58 : m_document(document) 59{ 60} 61 62void VisitedLinkState::invalidateStyleForAllLinks() 63{ 64 if (m_linksCheckedForVisitedState.isEmpty()) 65 return; 66 for (Node* node = document().firstChild(); node; node = NodeTraversal::next(*node)) { 67 if (node->isLink()) 68 node->setNeedsStyleRecalc(SubtreeStyleChange); 69 } 70} 71 72void VisitedLinkState::invalidateStyleForLink(LinkHash linkHash) 73{ 74 if (!m_linksCheckedForVisitedState.contains(linkHash)) 75 return; 76 for (Node* node = document().firstChild(); node; node = NodeTraversal::next(*node)) { 77 if (node->isLink() && linkHashForElement(toElement(*node)) == linkHash) 78 node->setNeedsStyleRecalc(SubtreeStyleChange); 79 } 80} 81 82EInsideLink VisitedLinkState::determineLinkStateSlowCase(const Element& element) 83{ 84 ASSERT(element.isLink()); 85 ASSERT(document().isActive()); 86 ASSERT(document() == element.document()); 87 88 const AtomicString& attribute = linkAttribute(element); 89 90 if (attribute.isNull()) 91 return NotInsideLink; // This can happen for <img usemap> 92 93 // An empty attribute refers to the document itself which is always 94 // visited. It is useful to check this explicitly so that visited 95 // links can be tested in platform independent manner, without 96 // explicit support in the test harness. 97 if (attribute.isEmpty()) 98 return InsideVisitedLink; 99 100 if (LinkHash hash = linkHashForElement(element, attribute)) { 101 m_linksCheckedForVisitedState.add(hash); 102 if (Platform::current()->isLinkVisited(hash)) 103 return InsideVisitedLink; 104 } 105 106 return InsideUnvisitedLink; 107} 108 109void VisitedLinkState::trace(Visitor* visitor) 110{ 111 visitor->trace(m_document); 112} 113 114} // namespace blink 115