| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * (C) 2001 Dirk Mueller (mueller@kde.org) |
| * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved. |
| * Copyright (C) 2009 Rob Buis (rwlbuis@gmail.com) |
| * Copyright (C) 2011 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 "core/html/HTMLLinkElement.h" |
| |
| #include "HTMLNames.h" |
| #include "RuntimeEnabledFeatures.h" |
| #include "bindings/v8/ScriptEventListener.h" |
| #include "core/css/MediaList.h" |
| #include "core/css/MediaQueryEvaluator.h" |
| #include "core/css/StyleSheetContents.h" |
| #include "core/css/resolver/StyleResolver.h" |
| #include "core/dom/Attribute.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/Event.h" |
| #include "core/dom/EventSender.h" |
| #include "core/dom/StyleSheetCollections.h" |
| #include "core/fetch/CSSStyleSheetResource.h" |
| #include "core/fetch/FetchRequest.h" |
| #include "core/fetch/ResourceFetcher.h" |
| #include "core/html/LinkImport.h" |
| #include "core/loader/FrameLoader.h" |
| #include "core/loader/FrameLoaderClient.h" |
| #include "core/page/ContentSecurityPolicy.h" |
| #include "core/page/Frame.h" |
| #include "core/page/FrameView.h" |
| #include "wtf/StdLibExtras.h" |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| static LinkEventSender& linkLoadEventSender() |
| { |
| DEFINE_STATIC_LOCAL(LinkEventSender, sharedLoadEventSender, (eventNames().loadEvent)); |
| return sharedLoadEventSender; |
| } |
| |
| inline HTMLLinkElement::HTMLLinkElement(const QualifiedName& tagName, Document* document, bool createdByParser) |
| : HTMLElement(tagName, document) |
| , m_linkLoader(this) |
| , m_sizes(DOMSettableTokenList::create()) |
| , m_createdByParser(createdByParser) |
| , m_isInShadowTree(false) |
| , m_beforeLoadRecurseCount(0) |
| { |
| ASSERT(hasTagName(linkTag)); |
| ScriptWrappable::init(this); |
| } |
| |
| PassRefPtr<HTMLLinkElement> HTMLLinkElement::create(const QualifiedName& tagName, Document* document, bool createdByParser) |
| { |
| return adoptRef(new HTMLLinkElement(tagName, document, createdByParser)); |
| } |
| |
| HTMLLinkElement::~HTMLLinkElement() |
| { |
| m_link.clear(); |
| |
| if (inDocument()) |
| document()->styleSheetCollections()->removeStyleSheetCandidateNode(this); |
| |
| linkLoadEventSender().cancelEvent(this); |
| } |
| |
| void HTMLLinkElement::parseAttribute(const QualifiedName& name, const AtomicString& value) |
| { |
| if (name == relAttr) { |
| m_relAttribute = LinkRelAttribute(value); |
| process(); |
| } else if (name == hrefAttr) { |
| process(); |
| } else if (name == typeAttr) { |
| m_type = value; |
| process(); |
| } else if (name == sizesAttr) { |
| setSizes(value); |
| process(); |
| } else if (name == mediaAttr) { |
| m_media = value.string().lower(); |
| process(); |
| } else if (name == disabledAttr) { |
| if (LinkStyle* link = linkStyle()) |
| link->setDisabledState(!value.isNull()); |
| } else if (name == onbeforeloadAttr) |
| setAttributeEventListener(eventNames().beforeloadEvent, createAttributeEventListener(this, name, value)); |
| else { |
| if (name == titleAttr) { |
| if (LinkStyle* link = linkStyle()) |
| link->setSheetTitle(value); |
| } |
| |
| HTMLElement::parseAttribute(name, value); |
| } |
| } |
| |
| bool HTMLLinkElement::shouldLoadLink() |
| { |
| bool continueLoad = true; |
| RefPtr<Document> originalDocument = document(); |
| int recursionRank = ++m_beforeLoadRecurseCount; |
| if (!dispatchBeforeLoadEvent(getNonEmptyURLAttribute(hrefAttr))) |
| continueLoad = false; |
| |
| // A beforeload handler might have removed us from the document or changed the document. |
| if (continueLoad && (!inDocument() || document() != originalDocument)) |
| continueLoad = false; |
| |
| // If the beforeload handler recurses into the link element by mutating it, we should only |
| // let the latest (innermost) mutation occur. |
| if (recursionRank != m_beforeLoadRecurseCount) |
| continueLoad = false; |
| |
| if (recursionRank == 1) |
| m_beforeLoadRecurseCount = 0; |
| |
| return continueLoad; |
| } |
| |
| LinkResource* HTMLLinkElement::linkResourceToProcess() |
| { |
| bool visible = inDocument() && !m_isInShadowTree; |
| if (!visible) { |
| ASSERT(!linkStyle() || !linkStyle()->hasSheet()); |
| return 0; |
| } |
| |
| if (!m_link) { |
| if (m_relAttribute.isImport() && RuntimeEnabledFeatures::htmlImportsEnabled()) |
| m_link = LinkImport::create(this); |
| else { |
| RefPtr<LinkStyle> link = LinkStyle::create(this); |
| if (fastHasAttribute(disabledAttr)) |
| link->setDisabledState(true); |
| m_link = link.release(); |
| } |
| } |
| |
| return m_link.get(); |
| } |
| |
| LinkStyle* HTMLLinkElement::linkStyle() const |
| { |
| if (!m_link || m_link->type() != LinkResource::Style) |
| return 0; |
| return static_cast<LinkStyle*>(m_link.get()); |
| } |
| |
| LinkImport* HTMLLinkElement::linkImport() const |
| { |
| if (!m_link || m_link->type() != LinkResource::Import) |
| return 0; |
| return static_cast<LinkImport*>(m_link.get()); |
| } |
| |
| Document* HTMLLinkElement::import() const |
| { |
| if (LinkImport* link = linkImport()) |
| return linkImport()->importedDocument(); |
| return 0; |
| } |
| |
| void HTMLLinkElement::process() |
| { |
| if (LinkResource* link = linkResourceToProcess()) |
| link->process(); |
| } |
| |
| Node::InsertionNotificationRequest HTMLLinkElement::insertedInto(ContainerNode* insertionPoint) |
| { |
| HTMLElement::insertedInto(insertionPoint); |
| if (!insertionPoint->inDocument()) |
| return InsertionDone; |
| |
| m_isInShadowTree = isInShadowTree(); |
| if (m_isInShadowTree) |
| return InsertionDone; |
| |
| document()->styleSheetCollections()->addStyleSheetCandidateNode(this, m_createdByParser); |
| |
| process(); |
| return InsertionDone; |
| } |
| |
| void HTMLLinkElement::removedFrom(ContainerNode* insertionPoint) |
| { |
| HTMLElement::removedFrom(insertionPoint); |
| if (!insertionPoint->inDocument()) |
| return; |
| |
| m_linkLoader.released(); |
| |
| if (m_isInShadowTree) { |
| ASSERT(!linkStyle() || !linkStyle()->hasSheet()); |
| return; |
| } |
| document()->styleSheetCollections()->removeStyleSheetCandidateNode(this); |
| |
| RefPtr<StyleSheet> removedSheet = sheet(); |
| |
| if (m_link) |
| m_link->ownerRemoved(); |
| |
| if (document()->renderer()) |
| document()->removedStyleSheet(removedSheet.get()); |
| } |
| |
| void HTMLLinkElement::finishParsingChildren() |
| { |
| m_createdByParser = false; |
| HTMLElement::finishParsingChildren(); |
| } |
| |
| bool HTMLLinkElement::styleSheetIsLoading() const |
| { |
| return linkStyle() && linkStyle()->styleSheetIsLoading(); |
| } |
| |
| void HTMLLinkElement::linkLoaded() |
| { |
| dispatchEvent(Event::create(eventNames().loadEvent)); |
| } |
| |
| void HTMLLinkElement::linkLoadingErrored() |
| { |
| dispatchEvent(Event::create(eventNames().errorEvent)); |
| } |
| |
| void HTMLLinkElement::didStartLinkPrerender() |
| { |
| dispatchEvent(Event::create(eventNames().webkitprerenderstartEvent)); |
| } |
| |
| void HTMLLinkElement::didStopLinkPrerender() |
| { |
| dispatchEvent(Event::create(eventNames().webkitprerenderstopEvent)); |
| } |
| |
| void HTMLLinkElement::didSendLoadForLinkPrerender() |
| { |
| dispatchEvent(Event::create(eventNames().webkitprerenderloadEvent)); |
| } |
| |
| void HTMLLinkElement::didSendDOMContentLoadedForLinkPrerender() |
| { |
| dispatchEvent(Event::create(eventNames().webkitprerenderdomcontentloadedEvent)); |
| } |
| |
| bool HTMLLinkElement::sheetLoaded() |
| { |
| ASSERT(linkStyle()); |
| return linkStyle()->sheetLoaded(); |
| } |
| |
| void HTMLLinkElement::notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred) |
| { |
| ASSERT(linkStyle()); |
| linkStyle()->notifyLoadedSheetAndAllCriticalSubresources(errorOccurred); |
| } |
| |
| void HTMLLinkElement::dispatchPendingLoadEvents() |
| { |
| linkLoadEventSender().dispatchPendingEvents(); |
| } |
| |
| void HTMLLinkElement::dispatchPendingEvent(LinkEventSender* eventSender) |
| { |
| ASSERT_UNUSED(eventSender, eventSender == &linkLoadEventSender()); |
| ASSERT(m_link); |
| if (m_link->hasLoaded()) |
| linkLoaded(); |
| else |
| linkLoadingErrored(); |
| } |
| |
| void HTMLLinkElement::scheduleEvent() |
| { |
| linkLoadEventSender().dispatchEventSoon(this); |
| } |
| |
| void HTMLLinkElement::startLoadingDynamicSheet() |
| { |
| ASSERT(linkStyle()); |
| linkStyle()->startLoadingDynamicSheet(); |
| } |
| |
| bool HTMLLinkElement::isURLAttribute(const Attribute& attribute) const |
| { |
| return attribute.name().localName() == hrefAttr || HTMLElement::isURLAttribute(attribute); |
| } |
| |
| KURL HTMLLinkElement::href() const |
| { |
| return document()->completeURL(getAttribute(hrefAttr)); |
| } |
| |
| String HTMLLinkElement::rel() const |
| { |
| return getAttribute(relAttr); |
| } |
| |
| String HTMLLinkElement::target() const |
| { |
| return getAttribute(targetAttr); |
| } |
| |
| String HTMLLinkElement::type() const |
| { |
| return getAttribute(typeAttr); |
| } |
| |
| IconType HTMLLinkElement::iconType() const |
| { |
| return m_relAttribute.iconType(); |
| } |
| |
| String HTMLLinkElement::iconSizes() const |
| { |
| return m_sizes->toString(); |
| } |
| |
| void HTMLLinkElement::addSubresourceAttributeURLs(ListHashSet<KURL>& urls) const |
| { |
| HTMLElement::addSubresourceAttributeURLs(urls); |
| |
| // Favicons are handled by a special case in LegacyWebArchive::create() |
| if (m_relAttribute.iconType() != InvalidIcon) |
| return; |
| |
| if (!m_relAttribute.isStyleSheet()) |
| return; |
| |
| // Append the URL of this link element. |
| addSubresourceURL(urls, href()); |
| |
| // Walk the URLs linked by the linked-to stylesheet. |
| if (CSSStyleSheet* styleSheet = const_cast<HTMLLinkElement*>(this)->sheet()) |
| styleSheet->contents()->addSubresourceStyleURLs(urls); |
| } |
| |
| DOMSettableTokenList* HTMLLinkElement::sizes() const |
| { |
| return m_sizes.get(); |
| } |
| |
| void HTMLLinkElement::setSizes(const String& value) |
| { |
| m_sizes->setValue(value); |
| } |
| |
| |
| PassRefPtr<LinkStyle> LinkStyle::create(HTMLLinkElement* owner) |
| { |
| return adoptRef(new LinkStyle(owner)); |
| } |
| |
| LinkStyle::LinkStyle(HTMLLinkElement* owner) |
| : LinkResource(owner) |
| , m_disabledState(Unset) |
| , m_pendingSheetType(None) |
| , m_loading(false) |
| , m_firedLoad(false) |
| , m_loadedSheet(false) |
| { |
| } |
| |
| LinkStyle::~LinkStyle() |
| { |
| if (m_sheet) |
| m_sheet->clearOwnerNode(); |
| |
| if (m_resource) |
| m_resource->removeClient(this); |
| } |
| |
| Document* LinkStyle::document() |
| { |
| return m_owner->document(); |
| } |
| |
| void LinkStyle::setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource* cachedStyleSheet) |
| { |
| if (!m_owner->inDocument()) { |
| ASSERT(!m_sheet); |
| return; |
| |
| } |
| // Completing the sheet load may cause scripts to execute. |
| RefPtr<Node> protector(m_owner); |
| |
| CSSParserContext parserContext(m_owner->document(), baseURL, charset); |
| |
| if (RefPtr<StyleSheetContents> restoredSheet = const_cast<CSSStyleSheetResource*>(cachedStyleSheet)->restoreParsedStyleSheet(parserContext)) { |
| ASSERT(restoredSheet->isCacheable()); |
| ASSERT(!restoredSheet->isLoading()); |
| |
| if (m_sheet) |
| clearSheet(); |
| m_sheet = CSSStyleSheet::create(restoredSheet, m_owner); |
| m_sheet->setMediaQueries(MediaQuerySet::create(m_owner->media())); |
| m_sheet->setTitle(m_owner->title()); |
| |
| m_loading = false; |
| sheetLoaded(); |
| notifyLoadedSheetAndAllCriticalSubresources(false); |
| return; |
| } |
| |
| RefPtr<StyleSheetContents> styleSheet = StyleSheetContents::create(href, parserContext); |
| |
| if (m_sheet) |
| clearSheet(); |
| m_sheet = CSSStyleSheet::create(styleSheet, m_owner); |
| m_sheet->setMediaQueries(MediaQuerySet::create(m_owner->media())); |
| m_sheet->setTitle(m_owner->title()); |
| |
| styleSheet->parseAuthorStyleSheet(cachedStyleSheet, m_owner->document()->securityOrigin()); |
| |
| m_loading = false; |
| styleSheet->notifyLoadedSheet(cachedStyleSheet); |
| styleSheet->checkLoaded(); |
| |
| if (styleSheet->isCacheable()) |
| const_cast<CSSStyleSheetResource*>(cachedStyleSheet)->saveParsedStyleSheet(styleSheet); |
| } |
| |
| bool LinkStyle::sheetLoaded() |
| { |
| if (!styleSheetIsLoading()) { |
| removePendingSheet(); |
| return true; |
| } |
| return false; |
| } |
| |
| void LinkStyle::notifyLoadedSheetAndAllCriticalSubresources(bool errorOccurred) |
| { |
| if (m_firedLoad) |
| return; |
| m_loadedSheet = !errorOccurred; |
| if (m_owner) |
| m_owner->scheduleEvent(); |
| m_firedLoad = true; |
| } |
| |
| void LinkStyle::startLoadingDynamicSheet() |
| { |
| ASSERT(m_pendingSheetType < Blocking); |
| addPendingSheet(Blocking); |
| } |
| |
| void LinkStyle::clearSheet() |
| { |
| ASSERT(m_sheet); |
| ASSERT(m_sheet->ownerNode() == m_owner); |
| m_sheet->clearOwnerNode(); |
| m_sheet = 0; |
| } |
| |
| bool LinkStyle::styleSheetIsLoading() const |
| { |
| if (m_loading) |
| return true; |
| if (!m_sheet) |
| return false; |
| return m_sheet->contents()->isLoading(); |
| } |
| |
| void LinkStyle::addPendingSheet(PendingSheetType type) |
| { |
| if (type <= m_pendingSheetType) |
| return; |
| m_pendingSheetType = type; |
| |
| if (m_pendingSheetType == NonBlocking) |
| return; |
| m_owner->document()->styleSheetCollections()->addPendingSheet(); |
| } |
| |
| void LinkStyle::removePendingSheet(RemovePendingSheetNotificationType notification) |
| { |
| PendingSheetType type = m_pendingSheetType; |
| m_pendingSheetType = None; |
| |
| if (type == None) |
| return; |
| if (type == NonBlocking) { |
| // Tell StyleSheetCollections to re-compute styleSheets of this m_owner's treescope. |
| m_owner->document()->styleSheetCollections()->modifiedStyleSheetCandidateNode(m_owner); |
| // Document::removePendingSheet() triggers the style selector recalc for blocking sheets. |
| // FIXME: We don't have enough knowledge at this point to know if we're adding or removing a sheet |
| // so we can't call addedStyleSheet() or removedStyleSheet(). |
| m_owner->document()->styleResolverChanged(RecalcStyleImmediately); |
| return; |
| } |
| |
| m_owner->document()->styleSheetCollections()->removePendingSheet(m_owner, |
| notification == RemovePendingSheetNotifyImmediately |
| ? StyleSheetCollections::RemovePendingSheetNotifyImmediately |
| : StyleSheetCollections::RemovePendingSheetNotifyLater); |
| } |
| |
| void LinkStyle::setDisabledState(bool disabled) |
| { |
| LinkStyle::DisabledState oldDisabledState = m_disabledState; |
| m_disabledState = disabled ? Disabled : EnabledViaScript; |
| if (oldDisabledState != m_disabledState) { |
| // If we change the disabled state while the sheet is still loading, then we have to |
| // perform three checks: |
| if (styleSheetIsLoading()) { |
| // Check #1: The sheet becomes disabled while loading. |
| if (m_disabledState == Disabled) |
| removePendingSheet(); |
| |
| // Check #2: An alternate sheet becomes enabled while it is still loading. |
| if (m_owner->relAttribute().isAlternate() && m_disabledState == EnabledViaScript) |
| addPendingSheet(Blocking); |
| |
| // Check #3: A main sheet becomes enabled while it was still loading and |
| // after it was disabled via script. It takes really terrible code to make this |
| // happen (a double toggle for no reason essentially). This happens on |
| // virtualplastic.net, which manages to do about 12 enable/disables on only 3 |
| // sheets. :) |
| if (!m_owner->relAttribute().isAlternate() && m_disabledState == EnabledViaScript && oldDisabledState == Disabled) |
| addPendingSheet(Blocking); |
| |
| // If the sheet is already loading just bail. |
| return; |
| } |
| |
| if (m_sheet) |
| m_sheet->setDisabled(disabled); |
| |
| // Load the sheet, since it's never been loaded before. |
| if (!m_sheet && m_disabledState == EnabledViaScript) { |
| if (m_owner->shouldProcessStyle()) |
| process(); |
| } else { |
| // FIXME: We don't have enough knowledge here to know if we should call addedStyleSheet() or removedStyleSheet(). |
| m_owner->document()->styleResolverChanged(RecalcStyleDeferred); |
| } |
| } |
| } |
| |
| void LinkStyle::process() |
| { |
| ASSERT(m_owner->shouldProcessStyle()); |
| String type = m_owner->typeValue().lower(); |
| LinkRequestBuilder builder(m_owner); |
| |
| if (m_owner->relAttribute().iconType() != InvalidIcon && builder.url().isValid() && !builder.url().isEmpty()) { |
| if (!m_owner->shouldLoadLink()) |
| return; |
| if (!document()->securityOrigin()->canDisplay(builder.url())) |
| return; |
| if (!document()->contentSecurityPolicy()->allowImageFromSource(builder.url())) |
| return; |
| if (document()->frame()) |
| document()->frame()->loader()->client()->dispatchDidChangeIcons(m_owner->relAttribute().iconType()); |
| } |
| |
| if (!m_owner->loadLink(type, builder.url())) |
| return; |
| |
| if ((m_disabledState != Disabled) && m_owner->relAttribute().isStyleSheet() |
| && document()->frame() && builder.url().isValid()) { |
| |
| if (m_resource) { |
| removePendingSheet(); |
| m_resource->removeClient(this); |
| m_resource = 0; |
| } |
| |
| if (!m_owner->shouldLoadLink()) |
| return; |
| |
| m_loading = true; |
| |
| bool mediaQueryMatches = true; |
| if (!m_owner->media().isEmpty()) { |
| RefPtr<RenderStyle> documentStyle = StyleResolver::styleForDocument(document()); |
| RefPtr<MediaQuerySet> media = MediaQuerySet::create(m_owner->media()); |
| MediaQueryEvaluator evaluator(document()->frame()->view()->mediaType(), document()->frame(), documentStyle.get()); |
| mediaQueryMatches = evaluator.eval(media.get()); |
| } |
| |
| // Don't hold up render tree construction and script execution on stylesheets |
| // that are not needed for the rendering at the moment. |
| bool blocking = mediaQueryMatches && !m_owner->isAlternate(); |
| addPendingSheet(blocking ? Blocking : NonBlocking); |
| |
| // Load stylesheets that are not needed for the rendering immediately with low priority. |
| FetchRequest request = builder.build(blocking); |
| m_resource = document()->fetcher()->fetchCSSStyleSheet(request); |
| |
| if (m_resource) |
| m_resource->addClient(this); |
| else { |
| // The request may have been denied if (for example) the stylesheet is local and the document is remote. |
| m_loading = false; |
| removePendingSheet(); |
| } |
| } else if (m_sheet) { |
| // we no longer contain a stylesheet, e.g. perhaps rel or type was changed |
| RefPtr<StyleSheet> removedSheet = m_sheet; |
| clearSheet(); |
| document()->removedStyleSheet(removedSheet.get()); |
| } |
| } |
| |
| void LinkStyle::setSheetTitle(const String& title) |
| { |
| if (m_sheet) |
| m_sheet->setTitle(title); |
| } |
| |
| void LinkStyle::ownerRemoved() |
| { |
| if (m_sheet) |
| clearSheet(); |
| |
| if (styleSheetIsLoading()) |
| removePendingSheet(RemovePendingSheetNotifyLater); |
| } |
| |
| } // namespace WebCore |