| /* |
| * 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/dom/ElementShadow.h" |
| #include "core/dom/ElementTraversal.h" |
| #include "core/dom/ShadowRoot.h" |
| #include "core/html/HTMLAnchorElement.h" |
| #include "core/html_names.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 (auto* anchor = ToHTMLAnchorElementOrNull(element)) |
| return anchor->VisitedLinkHash(); |
| return VisitedLinkHash( |
| element.GetDocument().BaseURL(), |
| attribute.IsNull() ? LinkAttribute(element) : attribute); |
| } |
| |
| VisitedLinkState::VisitedLinkState(const Document& document) |
| : document_(document) {} |
| |
| static void InvalidateStyleForAllLinksRecursively( |
| Node& root_node, |
| bool invalidate_visited_link_hashes) { |
| for (Node& node : NodeTraversal::StartsAt(root_node)) { |
| if (node.IsLink()) { |
| if (invalidate_visited_link_hashes && IsHTMLAnchorElement(node)) |
| ToHTMLAnchorElement(node).InvalidateCachedVisitedLinkHash(); |
| ToElement(node).PseudoStateChanged(CSSSelector::kPseudoLink); |
| ToElement(node).PseudoStateChanged(CSSSelector::kPseudoVisited); |
| ToElement(node).PseudoStateChanged(CSSSelector::kPseudoWebkitAnyLink); |
| ToElement(node).PseudoStateChanged(CSSSelector::kPseudoAnyLink); |
| } |
| if (IsShadowHost(&node)) { |
| for (ShadowRoot* root = node.YoungestShadowRoot(); root; |
| root = root->OlderShadowRoot()) |
| InvalidateStyleForAllLinksRecursively(*root, |
| invalidate_visited_link_hashes); |
| } |
| } |
| } |
| |
| void VisitedLinkState::InvalidateStyleForAllLinks( |
| bool invalidate_visited_link_hashes) { |
| if (!links_checked_for_visited_state_.IsEmpty() && GetDocument().firstChild()) |
| InvalidateStyleForAllLinksRecursively(*GetDocument().firstChild(), |
| invalidate_visited_link_hashes); |
| } |
| |
| static void InvalidateStyleForLinkRecursively(Node& root_node, |
| LinkHash link_hash) { |
| for (Node& node : NodeTraversal::StartsAt(root_node)) { |
| if (node.IsLink() && LinkHashForElement(ToElement(node)) == link_hash) { |
| ToElement(node).PseudoStateChanged(CSSSelector::kPseudoLink); |
| ToElement(node).PseudoStateChanged(CSSSelector::kPseudoVisited); |
| ToElement(node).PseudoStateChanged(CSSSelector::kPseudoWebkitAnyLink); |
| ToElement(node).PseudoStateChanged(CSSSelector::kPseudoAnyLink); |
| } |
| if (IsShadowHost(&node)) |
| for (ShadowRoot* root = node.YoungestShadowRoot(); root; |
| root = root->OlderShadowRoot()) |
| InvalidateStyleForLinkRecursively(*root, link_hash); |
| } |
| } |
| |
| void VisitedLinkState::InvalidateStyleForLink(LinkHash link_hash) { |
| if (links_checked_for_visited_state_.Contains(link_hash) && |
| GetDocument().firstChild()) |
| InvalidateStyleForLinkRecursively(*GetDocument().firstChild(), link_hash); |
| } |
| |
| EInsideLink VisitedLinkState::DetermineLinkStateSlowCase( |
| const Element& element) { |
| DCHECK(element.IsLink()); |
| DCHECK(GetDocument().IsActive()); |
| DCHECK(GetDocument() == element.GetDocument()); |
| |
| 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)) { |
| links_checked_for_visited_state_.insert(hash); |
| if (Platform::Current()->IsLinkVisited(hash)) |
| return EInsideLink::kInsideVisitedLink; |
| } |
| |
| return EInsideLink::kInsideUnvisitedLink; |
| } |
| |
| void VisitedLinkState::Trace(blink::Visitor* visitor) { |
| visitor->Trace(document_); |
| } |
| |
| } // namespace blink |