| /* |
| * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
| * (C) 1999 Antti Koivisto (koivisto@kde.org) |
| * (C) 2001 Dirk Mueller (mueller@kde.org) |
| * (C) 2006 Alexey Proskuryakov (ap@webkit.org) |
| * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved. |
| * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) |
| * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved. |
| * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) |
| * Copyright (C) Research In Motion Limited 2010-2011. 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 "DocumentStyleSheetCollection.h" |
| |
| #include "CSSStyleSheet.h" |
| #include "Document.h" |
| #include "Element.h" |
| #include "HTMLIFrameElement.h" |
| #include "HTMLLinkElement.h" |
| #include "HTMLNames.h" |
| #include "HTMLStyleElement.h" |
| #include "Page.h" |
| #include "PageGroup.h" |
| #include "ProcessingInstruction.h" |
| #include "SVGNames.h" |
| #include "SVGStyleElement.h" |
| #include "Settings.h" |
| #include "StyleInvalidationAnalysis.h" |
| #include "StyleResolver.h" |
| #include "StyleSheetContents.h" |
| #include "StyleSheetList.h" |
| #include "UserContentURLPattern.h" |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| DocumentStyleSheetCollection::DocumentStyleSheetCollection(Document& document) |
| : m_document(document) |
| , m_pendingStylesheets(0) |
| , m_injectedStyleSheetCacheValid(false) |
| , m_hadActiveLoadingStylesheet(false) |
| , m_pendingUpdateType(NoUpdate) |
| , m_usesSiblingRules(false) |
| , m_usesSiblingRulesOverride(false) |
| , m_usesFirstLineRules(false) |
| , m_usesFirstLetterRules(false) |
| , m_usesBeforeAfterRules(false) |
| , m_usesBeforeAfterRulesOverride(false) |
| , m_usesRemUnits(false) |
| { |
| } |
| |
| void DocumentStyleSheetCollection::combineCSSFeatureFlags() |
| { |
| // Delay resetting the flags until after next style recalc since unapplying the style may not work without these set (this is true at least with before/after). |
| const StyleResolver& styleResolver = m_document.ensureStyleResolver(); |
| m_usesSiblingRules = m_usesSiblingRules || styleResolver.usesSiblingRules(); |
| m_usesFirstLineRules = m_usesFirstLineRules || styleResolver.usesFirstLineRules(); |
| m_usesBeforeAfterRules = m_usesBeforeAfterRules || styleResolver.usesBeforeAfterRules(); |
| } |
| |
| void DocumentStyleSheetCollection::resetCSSFeatureFlags() |
| { |
| const StyleResolver& styleResolver = m_document.ensureStyleResolver(); |
| m_usesSiblingRules = styleResolver.usesSiblingRules(); |
| m_usesFirstLineRules = styleResolver.usesFirstLineRules(); |
| m_usesBeforeAfterRules = styleResolver.usesBeforeAfterRules(); |
| } |
| |
| CSSStyleSheet* DocumentStyleSheetCollection::pageUserSheet() |
| { |
| if (m_pageUserSheet) |
| return m_pageUserSheet.get(); |
| |
| Page* owningPage = m_document.page(); |
| if (!owningPage) |
| return 0; |
| |
| String userSheetText = owningPage->userStyleSheet(); |
| if (userSheetText.isEmpty()) |
| return 0; |
| |
| // Parse the sheet and cache it. |
| m_pageUserSheet = CSSStyleSheet::createInline(m_document, m_document.settings()->userStyleSheetLocation()); |
| m_pageUserSheet->contents()->setIsUserStyleSheet(true); |
| m_pageUserSheet->contents()->parseString(userSheetText); |
| return m_pageUserSheet.get(); |
| } |
| |
| void DocumentStyleSheetCollection::clearPageUserSheet() |
| { |
| if (m_pageUserSheet) { |
| m_pageUserSheet = 0; |
| m_document.styleResolverChanged(DeferRecalcStyle); |
| } |
| } |
| |
| void DocumentStyleSheetCollection::updatePageUserSheet() |
| { |
| clearPageUserSheet(); |
| if (pageUserSheet()) |
| m_document.styleResolverChanged(RecalcStyleImmediately); |
| } |
| |
| const Vector<RefPtr<CSSStyleSheet>>& DocumentStyleSheetCollection::injectedUserStyleSheets() const |
| { |
| updateInjectedStyleSheetCache(); |
| return m_injectedUserStyleSheets; |
| } |
| |
| const Vector<RefPtr<CSSStyleSheet>>& DocumentStyleSheetCollection::injectedAuthorStyleSheets() const |
| { |
| updateInjectedStyleSheetCache(); |
| return m_injectedAuthorStyleSheets; |
| } |
| |
| void DocumentStyleSheetCollection::updateInjectedStyleSheetCache() const |
| { |
| if (m_injectedStyleSheetCacheValid) |
| return; |
| m_injectedStyleSheetCacheValid = true; |
| m_injectedUserStyleSheets.clear(); |
| m_injectedAuthorStyleSheets.clear(); |
| |
| Page* owningPage = m_document.page(); |
| if (!owningPage) |
| return; |
| |
| const PageGroup& pageGroup = owningPage->group(); |
| const UserStyleSheetMap* sheetsMap = pageGroup.userStyleSheets(); |
| if (!sheetsMap) |
| return; |
| |
| UserStyleSheetMap::const_iterator end = sheetsMap->end(); |
| for (UserStyleSheetMap::const_iterator it = sheetsMap->begin(); it != end; ++it) { |
| const UserStyleSheetVector* sheets = it->value.get(); |
| for (unsigned i = 0; i < sheets->size(); ++i) { |
| const UserStyleSheet* sheet = sheets->at(i).get(); |
| if (sheet->injectedFrames() == InjectInTopFrameOnly && m_document.ownerElement()) |
| continue; |
| if (!UserContentURLPattern::matchesPatterns(m_document.url(), sheet->whitelist(), sheet->blacklist())) |
| continue; |
| RefPtr<CSSStyleSheet> groupSheet = CSSStyleSheet::createInline(const_cast<Document&>(m_document), sheet->url()); |
| bool isUserStyleSheet = sheet->level() == UserStyleUserLevel; |
| if (isUserStyleSheet) |
| m_injectedUserStyleSheets.append(groupSheet); |
| else |
| m_injectedAuthorStyleSheets.append(groupSheet); |
| groupSheet->contents()->setIsUserStyleSheet(isUserStyleSheet); |
| groupSheet->contents()->parseString(sheet->source()); |
| } |
| } |
| } |
| |
| void DocumentStyleSheetCollection::invalidateInjectedStyleSheetCache() |
| { |
| if (!m_injectedStyleSheetCacheValid) |
| return; |
| m_injectedStyleSheetCacheValid = false; |
| if (m_injectedUserStyleSheets.isEmpty() && m_injectedAuthorStyleSheets.isEmpty()) |
| return; |
| m_document.styleResolverChanged(DeferRecalcStyle); |
| } |
| |
| void DocumentStyleSheetCollection::addAuthorSheet(PassRef<StyleSheetContents> authorSheet) |
| { |
| ASSERT(!authorSheet.get().isUserStyleSheet()); |
| m_authorStyleSheets.append(CSSStyleSheet::create(std::move(authorSheet), &m_document)); |
| m_document.styleResolverChanged(RecalcStyleImmediately); |
| } |
| |
| void DocumentStyleSheetCollection::addUserSheet(PassRef<StyleSheetContents> userSheet) |
| { |
| ASSERT(userSheet.get().isUserStyleSheet()); |
| m_userStyleSheets.append(CSSStyleSheet::create(std::move(userSheet), &m_document)); |
| m_document.styleResolverChanged(RecalcStyleImmediately); |
| } |
| |
| // This method is called whenever a top-level stylesheet has finished loading. |
| void DocumentStyleSheetCollection::removePendingSheet(RemovePendingSheetNotificationType notification) |
| { |
| // Make sure we knew this sheet was pending, and that our count isn't out of sync. |
| ASSERT(m_pendingStylesheets > 0); |
| |
| m_pendingStylesheets--; |
| |
| #ifdef INSTRUMENT_LAYOUT_SCHEDULING |
| if (!ownerElement()) |
| printf("Stylesheet loaded at time %d. %d stylesheets still remain.\n", elapsedTime(), m_pendingStylesheets); |
| #endif |
| |
| if (m_pendingStylesheets) |
| return; |
| |
| if (notification == RemovePendingSheetNotifyLater) { |
| m_document.setNeedsNotifyRemoveAllPendingStylesheet(); |
| return; |
| } |
| |
| m_document.didRemoveAllPendingStylesheet(); |
| } |
| |
| void DocumentStyleSheetCollection::addStyleSheetCandidateNode(Node& node, bool createdByParser) |
| { |
| if (!node.inDocument()) |
| return; |
| |
| // Until the <body> exists, we have no choice but to compare document positions, |
| // since styles outside of the body and head continue to be shunted into the head |
| // (and thus can shift to end up before dynamically added DOM content that is also |
| // outside the body). |
| if ((createdByParser && m_document.body()) || m_styleSheetCandidateNodes.isEmpty()) { |
| m_styleSheetCandidateNodes.add(&node); |
| return; |
| } |
| |
| // Determine an appropriate insertion point. |
| StyleSheetCandidateListHashSet::iterator begin = m_styleSheetCandidateNodes.begin(); |
| StyleSheetCandidateListHashSet::iterator end = m_styleSheetCandidateNodes.end(); |
| StyleSheetCandidateListHashSet::iterator it = end; |
| Node* followingNode = 0; |
| do { |
| --it; |
| Node* n = *it; |
| unsigned short position = n->compareDocumentPosition(&node); |
| if (position == Node::DOCUMENT_POSITION_FOLLOWING) { |
| m_styleSheetCandidateNodes.insertBefore(followingNode, &node); |
| return; |
| } |
| followingNode = n; |
| } while (it != begin); |
| |
| m_styleSheetCandidateNodes.insertBefore(followingNode, &node); |
| } |
| |
| void DocumentStyleSheetCollection::removeStyleSheetCandidateNode(Node& node) |
| { |
| m_styleSheetCandidateNodes.remove(&node); |
| } |
| |
| void DocumentStyleSheetCollection::collectActiveStyleSheets(Vector<RefPtr<StyleSheet>>& sheets) |
| { |
| if (m_document.settings() && !m_document.settings()->authorAndUserStylesEnabled()) |
| return; |
| |
| StyleSheetCandidateListHashSet::iterator begin = m_styleSheetCandidateNodes.begin(); |
| StyleSheetCandidateListHashSet::iterator end = m_styleSheetCandidateNodes.end(); |
| for (StyleSheetCandidateListHashSet::iterator it = begin; it != end; ++it) { |
| Node* n = *it; |
| StyleSheet* sheet = 0; |
| if (n->nodeType() == Node::PROCESSING_INSTRUCTION_NODE) { |
| // Processing instruction (XML documents only). |
| // We don't support linking to embedded CSS stylesheets, see <https://bugs.webkit.org/show_bug.cgi?id=49281> for discussion. |
| ProcessingInstruction* pi = toProcessingInstruction(n); |
| sheet = pi->sheet(); |
| #if ENABLE(XSLT) |
| // Don't apply XSL transforms to already transformed documents -- <rdar://problem/4132806> |
| if (pi->isXSL() && !m_document.transformSourceDocument()) { |
| // Don't apply XSL transforms until loading is finished. |
| if (!m_document.parsing()) |
| m_document.applyXSLTransform(pi); |
| return; |
| } |
| #endif |
| } else if ((n->isHTMLElement() && (n->hasTagName(linkTag) || n->hasTagName(styleTag))) |
| #if ENABLE(SVG) |
| || (n->isSVGElement() && n->hasTagName(SVGNames::styleTag)) |
| #endif |
| ) { |
| Element* e = toElement(n); |
| AtomicString title = e->getAttribute(titleAttr); |
| bool enabledViaScript = false; |
| if (e->hasTagName(linkTag)) { |
| // <LINK> element |
| HTMLLinkElement* linkElement = static_cast<HTMLLinkElement*>(n); |
| if (linkElement->isDisabled()) |
| continue; |
| enabledViaScript = linkElement->isEnabledViaScript(); |
| if (linkElement->styleSheetIsLoading()) { |
| // it is loading but we should still decide which style sheet set to use |
| if (!enabledViaScript && !title.isEmpty() && m_preferredStylesheetSetName.isEmpty()) { |
| const AtomicString& rel = e->getAttribute(relAttr); |
| if (!rel.contains("alternate")) { |
| m_preferredStylesheetSetName = title; |
| m_selectedStylesheetSetName = title; |
| } |
| } |
| continue; |
| } |
| if (!linkElement->sheet()) |
| title = nullAtom; |
| } |
| // Get the current preferred styleset. This is the |
| // set of sheets that will be enabled. |
| #if ENABLE(SVG) |
| if (isSVGStyleElement(e)) |
| sheet = toSVGStyleElement(e)->sheet(); |
| else |
| #endif |
| { |
| if (isHTMLLinkElement(e)) |
| sheet = toHTMLLinkElement(n)->sheet(); |
| else { |
| // <STYLE> element |
| sheet = toHTMLStyleElement(e)->sheet(); |
| } |
| } |
| // Check to see if this sheet belongs to a styleset |
| // (thus making it PREFERRED or ALTERNATE rather than |
| // PERSISTENT). |
| AtomicString rel = e->getAttribute(relAttr); |
| if (!enabledViaScript && !title.isEmpty()) { |
| // Yes, we have a title. |
| if (m_preferredStylesheetSetName.isEmpty()) { |
| // No preferred set has been established. If |
| // we are NOT an alternate sheet, then establish |
| // us as the preferred set. Otherwise, just ignore |
| // this sheet. |
| if (e->hasTagName(styleTag) || !rel.contains("alternate")) |
| m_preferredStylesheetSetName = m_selectedStylesheetSetName = title; |
| } |
| if (title != m_preferredStylesheetSetName) |
| sheet = 0; |
| } |
| |
| if (rel.contains("alternate") && title.isEmpty()) |
| sheet = 0; |
| } |
| if (sheet) |
| sheets.append(sheet); |
| } |
| } |
| |
| void DocumentStyleSheetCollection::analyzeStyleSheetChange(UpdateFlag updateFlag, const Vector<RefPtr<CSSStyleSheet>>& newStylesheets, StyleResolverUpdateType& styleResolverUpdateType, bool& requiresFullStyleRecalc) |
| { |
| styleResolverUpdateType = Reconstruct; |
| requiresFullStyleRecalc = true; |
| |
| // Stylesheets of <style> elements that @import stylesheets are active but loading. We need to trigger a full recalc when such loads are done. |
| bool hasActiveLoadingStylesheet = false; |
| unsigned newStylesheetCount = newStylesheets.size(); |
| for (unsigned i = 0; i < newStylesheetCount; ++i) { |
| if (newStylesheets[i]->isLoading()) |
| hasActiveLoadingStylesheet = true; |
| } |
| if (m_hadActiveLoadingStylesheet && !hasActiveLoadingStylesheet) { |
| m_hadActiveLoadingStylesheet = false; |
| return; |
| } |
| m_hadActiveLoadingStylesheet = hasActiveLoadingStylesheet; |
| |
| if (updateFlag != OptimizedUpdate) |
| return; |
| if (!m_document.styleResolverIfExists()) |
| return; |
| |
| // Find out which stylesheets are new. |
| unsigned oldStylesheetCount = m_activeAuthorStyleSheets.size(); |
| if (newStylesheetCount < oldStylesheetCount) |
| return; |
| Vector<StyleSheetContents*> addedSheets; |
| unsigned newIndex = 0; |
| for (unsigned oldIndex = 0; oldIndex < oldStylesheetCount; ++oldIndex) { |
| if (newIndex >= newStylesheetCount) |
| return; |
| while (m_activeAuthorStyleSheets[oldIndex] != newStylesheets[newIndex]) { |
| addedSheets.append(newStylesheets[newIndex]->contents()); |
| ++newIndex; |
| if (newIndex == newStylesheetCount) |
| return; |
| } |
| ++newIndex; |
| } |
| bool hasInsertions = !addedSheets.isEmpty(); |
| while (newIndex < newStylesheetCount) { |
| addedSheets.append(newStylesheets[newIndex]->contents()); |
| ++newIndex; |
| } |
| // If all new sheets were added at the end of the list we can just add them to existing StyleResolver. |
| // If there were insertions we need to re-add all the stylesheets so rules are ordered correctly. |
| styleResolverUpdateType = hasInsertions ? Reset : Additive; |
| |
| // If we are already parsing the body and so may have significant amount of elements, put some effort into trying to avoid style recalcs. |
| if (!m_document.body() || m_document.hasNodesWithPlaceholderStyle()) |
| return; |
| StyleInvalidationAnalysis invalidationAnalysis(addedSheets); |
| if (invalidationAnalysis.dirtiesAllStyle()) |
| return; |
| invalidationAnalysis.invalidateStyle(m_document); |
| requiresFullStyleRecalc = false; |
| } |
| |
| static bool styleSheetsUseRemUnits(const Vector<RefPtr<CSSStyleSheet>>& sheets) |
| { |
| for (unsigned i = 0; i < sheets.size(); ++i) { |
| if (sheets[i]->contents()->usesRemUnits()) |
| return true; |
| } |
| return false; |
| } |
| |
| static void filterEnabledNonemptyCSSStyleSheets(Vector<RefPtr<CSSStyleSheet>>& result, const Vector<RefPtr<StyleSheet>>& sheets) |
| { |
| for (unsigned i = 0; i < sheets.size(); ++i) { |
| if (!sheets[i]->isCSSStyleSheet()) |
| continue; |
| if (sheets[i]->disabled()) |
| continue; |
| CSSStyleSheet* sheet = static_cast<CSSStyleSheet*>(sheets[i].get()); |
| if (!sheet->length()) |
| continue; |
| result.append(sheet); |
| } |
| } |
| |
| static void collectActiveCSSStyleSheetsFromSeamlessParents(Vector<RefPtr<CSSStyleSheet>>& sheets, Document& document) |
| { |
| HTMLIFrameElement* seamlessParentIFrame = document.seamlessParentIFrame(); |
| if (!seamlessParentIFrame) |
| return; |
| sheets.appendVector(seamlessParentIFrame->document().styleSheetCollection().activeAuthorStyleSheets()); |
| } |
| |
| bool DocumentStyleSheetCollection::updateActiveStyleSheets(UpdateFlag updateFlag) |
| { |
| if (m_document.inStyleRecalc()) { |
| // SVG <use> element may manage to invalidate style selector in the middle of a style recalc. |
| // https://bugs.webkit.org/show_bug.cgi?id=54344 |
| // FIXME: This should be fixed in SVG and the call site replaced by ASSERT(!m_inStyleRecalc). |
| m_pendingUpdateType = FullUpdate; |
| m_document.scheduleForcedStyleRecalc(); |
| return false; |
| |
| } |
| if (!m_document.renderView() || !m_document.attached()) |
| return false; |
| |
| Vector<RefPtr<StyleSheet>> activeStyleSheets; |
| collectActiveStyleSheets(activeStyleSheets); |
| |
| Vector<RefPtr<CSSStyleSheet>> activeCSSStyleSheets; |
| activeCSSStyleSheets.appendVector(injectedAuthorStyleSheets()); |
| activeCSSStyleSheets.appendVector(documentAuthorStyleSheets()); |
| collectActiveCSSStyleSheetsFromSeamlessParents(activeCSSStyleSheets, m_document); |
| filterEnabledNonemptyCSSStyleSheets(activeCSSStyleSheets, activeStyleSheets); |
| |
| StyleResolverUpdateType styleResolverUpdateType; |
| bool requiresFullStyleRecalc; |
| analyzeStyleSheetChange(updateFlag, activeCSSStyleSheets, styleResolverUpdateType, requiresFullStyleRecalc); |
| |
| if (styleResolverUpdateType == Reconstruct) |
| m_document.clearStyleResolver(); |
| else { |
| StyleResolver& styleResolver = m_document.ensureStyleResolver(); |
| if (styleResolverUpdateType == Reset) { |
| styleResolver.ruleSets().resetAuthorStyle(); |
| styleResolver.appendAuthorStyleSheets(0, activeCSSStyleSheets); |
| } else { |
| ASSERT(styleResolverUpdateType == Additive); |
| styleResolver.appendAuthorStyleSheets(m_activeAuthorStyleSheets.size(), activeCSSStyleSheets); |
| } |
| resetCSSFeatureFlags(); |
| } |
| |
| m_weakCopyOfActiveStyleSheetListForFastLookup.clear(); |
| m_activeAuthorStyleSheets.swap(activeCSSStyleSheets); |
| m_styleSheetsForStyleSheetList.swap(activeStyleSheets); |
| |
| m_usesRemUnits = styleSheetsUseRemUnits(m_activeAuthorStyleSheets); |
| m_pendingUpdateType = NoUpdate; |
| |
| m_document.notifySeamlessChildDocumentsOfStylesheetUpdate(); |
| |
| return requiresFullStyleRecalc; |
| } |
| |
| bool DocumentStyleSheetCollection::activeStyleSheetsContains(const CSSStyleSheet* sheet) const |
| { |
| if (!m_weakCopyOfActiveStyleSheetListForFastLookup) { |
| m_weakCopyOfActiveStyleSheetListForFastLookup = adoptPtr(new HashSet<const CSSStyleSheet*>); |
| for (unsigned i = 0; i < m_activeAuthorStyleSheets.size(); ++i) |
| m_weakCopyOfActiveStyleSheetListForFastLookup->add(m_activeAuthorStyleSheets[i].get()); |
| } |
| return m_weakCopyOfActiveStyleSheetListForFastLookup->contains(sheet); |
| } |
| |
| void DocumentStyleSheetCollection::detachFromDocument() |
| { |
| if (m_pageUserSheet) |
| m_pageUserSheet->detachFromDocument(); |
| for (unsigned i = 0; i < m_injectedUserStyleSheets.size(); ++i) |
| m_injectedUserStyleSheets[i]->detachFromDocument(); |
| for (unsigned i = 0; i < m_injectedAuthorStyleSheets.size(); ++i) |
| m_injectedAuthorStyleSheets[i]->detachFromDocument(); |
| for (unsigned i = 0; i < m_userStyleSheets.size(); ++i) |
| m_userStyleSheets[i]->detachFromDocument(); |
| for (unsigned i = 0; i < m_authorStyleSheets.size(); ++i) |
| m_authorStyleSheets[i]->detachFromDocument(); |
| } |
| |
| } |
