| /* |
| * 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, 2010, 2012 Apple Inc. All rights reserved. |
| * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) |
| * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) |
| * Copyright (C) 2013 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/dom/StyleSheetCollection.h" |
| |
| #include "HTMLNames.h" |
| #include "SVGNames.h" |
| #include "core/css/CSSStyleSheet.h" |
| #include "core/css/StyleInvalidationAnalysis.h" |
| #include "core/css/StyleSheetContents.h" |
| #include "core/css/resolver/StyleResolver.h" |
| #include "core/dom/Document.h" |
| #include "core/dom/DocumentStyleSheetCollection.h" |
| #include "core/dom/Element.h" |
| #include "core/dom/ProcessingInstruction.h" |
| #include "core/dom/shadow/ShadowRoot.h" |
| #include "core/html/HTMLIFrameElement.h" |
| #include "core/html/HTMLLinkElement.h" |
| #include "core/html/HTMLStyleElement.h" |
| #include "core/page/Settings.h" |
| #include "core/svg/SVGStyleElement.h" |
| |
| namespace WebCore { |
| |
| using namespace HTMLNames; |
| |
| StyleSheetCollection::StyleSheetCollection(TreeScope* treeScope) |
| : m_treeScope(treeScope) |
| , m_hadActiveLoadingStylesheet(false) |
| { |
| } |
| |
| void StyleSheetCollection::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 && document()->body()) |
| m_styleSheetCandidateNodes.parserAdd(node); |
| else |
| m_styleSheetCandidateNodes.add(node); |
| |
| if (!isHTMLStyleElement(node)) |
| return; |
| |
| ContainerNode* scopingNode = toHTMLStyleElement(node)->scopingNode(); |
| if (!isTreeScopeRoot(scopingNode)) |
| m_scopingNodesForStyleScoped.add(scopingNode); |
| } |
| |
| void StyleSheetCollection::removeStyleSheetCandidateNode(Node* node, ContainerNode* scopingNode) |
| { |
| m_styleSheetCandidateNodes.remove(node); |
| |
| if (!isTreeScopeRoot(scopingNode)) |
| m_scopingNodesForStyleScoped.remove(scopingNode); |
| } |
| |
| StyleSheetCollection::StyleResolverUpdateType StyleSheetCollection::compareStyleSheets(const Vector<RefPtr<CSSStyleSheet> >& oldStyleSheets, const Vector<RefPtr<CSSStyleSheet> >& newStylesheets, Vector<StyleSheetContents*>& addedSheets) |
| { |
| // Find out which stylesheets are new. |
| unsigned newStylesheetCount = newStylesheets.size(); |
| unsigned oldStylesheetCount = oldStyleSheets.size(); |
| if (newStylesheetCount < oldStylesheetCount) |
| return Reconstruct; |
| |
| unsigned newIndex = 0; |
| for (unsigned oldIndex = 0; oldIndex < oldStylesheetCount; ++oldIndex) { |
| if (newIndex >= newStylesheetCount) |
| return Reconstruct; |
| while (oldStyleSheets[oldIndex] != newStylesheets[newIndex]) { |
| addedSheets.append(newStylesheets[newIndex]->contents()); |
| ++newIndex; |
| if (newIndex == newStylesheetCount) |
| return Reconstruct; |
| } |
| ++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. |
| return hasInsertions ? Reset : Additive; |
| } |
| |
| bool StyleSheetCollection::activeLoadingStyleSheetLoaded(const Vector<RefPtr<CSSStyleSheet> >& newStyleSheets) |
| { |
| // 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 true; |
| } |
| m_hadActiveLoadingStylesheet = hasActiveLoadingStylesheet; |
| return false; |
| } |
| |
| void StyleSheetCollection::analyzeStyleSheetChange(StyleResolverUpdateMode updateMode, const Vector<RefPtr<CSSStyleSheet> >& oldStyleSheets, const Vector<RefPtr<CSSStyleSheet> >& newStyleSheets, StyleResolverUpdateType& styleResolverUpdateType, bool& requiresFullStyleRecalc) |
| { |
| styleResolverUpdateType = Reconstruct; |
| requiresFullStyleRecalc = true; |
| |
| if (activeLoadingStyleSheetLoaded(newStyleSheets)) |
| return; |
| |
| if (updateMode != AnalyzedStyleUpdate) |
| return; |
| if (!document()->styleResolverIfExists()) |
| return; |
| |
| // Find out which stylesheets are new. |
| Vector<StyleSheetContents*> addedSheets; |
| styleResolverUpdateType = compareStyleSheets(oldStyleSheets, newStyleSheets, addedSheets); |
| |
| // 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 (!document()->body() || document()->hasNodesWithPlaceholderStyle()) |
| return; |
| StyleInvalidationAnalysis invalidationAnalysis(addedSheets); |
| if (invalidationAnalysis.dirtiesAllStyle()) |
| return; |
| invalidationAnalysis.invalidateStyle(document()); |
| requiresFullStyleRecalc = false; |
| } |
| |
| void StyleSheetCollection::resetAllRuleSetsInTreeScope(StyleResolver* styleResolver) |
| { |
| // FIXME: If many web developers use style scoped, implement reset RuleSets in per-scoping node manner. |
| if (DocumentOrderedList* styleScopedScopingNodes = scopingNodesForStyleScoped()) { |
| for (DocumentOrderedList::iterator it = styleScopedScopingNodes->begin(); it != styleScopedScopingNodes->end(); ++it) |
| styleResolver->resetAuthorStyle(toContainerNode(*it)); |
| } |
| if (ListHashSet<Node*, 4>* removedNodes = scopingNodesRemoved()) { |
| for (ListHashSet<Node*, 4>::iterator it = removedNodes->begin(); it != removedNodes->end(); ++it) |
| styleResolver->resetAuthorStyle(toContainerNode(*it)); |
| } |
| styleResolver->resetAuthorStyle(toContainerNode(m_treeScope->rootNode())); |
| } |
| |
| 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; |
| } |
| |
| void StyleSheetCollection::updateUsesRemUnits() |
| { |
| m_usesRemUnits = styleSheetsUseRemUnits(m_activeAuthorStyleSheets); |
| } |
| |
| StyleSheetCollectionForDocument::StyleSheetCollectionForDocument(TreeScope* treeScope) |
| : StyleSheetCollection(treeScope) |
| { |
| ASSERT(treeScope->rootNode() == treeScope->rootNode()->document()); |
| } |
| |
| void StyleSheetCollectionForDocument::collectStyleSheets(DocumentStyleSheetCollection* collections, Vector<RefPtr<StyleSheet> >& styleSheets, Vector<RefPtr<CSSStyleSheet> >& activeSheets) |
| { |
| if (document()->settings() && !document()->settings()->authorAndUserStylesEnabled()) |
| return; |
| |
| DocumentOrderedList::iterator begin = m_styleSheetCandidateNodes.begin(); |
| DocumentOrderedList::iterator end = m_styleSheetCandidateNodes.end(); |
| for (DocumentOrderedList::iterator it = begin; it != end; ++it) { |
| Node* n = *it; |
| StyleSheet* sheet = 0; |
| CSSStyleSheet* activeSheet = 0; |
| if (n->nodeType() == Node::PROCESSING_INSTRUCTION_NODE && !document()->isHTMLDocument()) { |
| // 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 = static_cast<ProcessingInstruction*>(n); |
| // Don't apply XSL transforms to already transformed documents -- <rdar://problem/4132806> |
| if (pi->isXSL() && !document()->transformSourceDocument()) { |
| // Don't apply XSL transforms until loading is finished. |
| if (!document()->parsing() && !pi->isLoading()) |
| document()->applyXSLTransform(pi); |
| return; |
| } |
| sheet = pi->sheet(); |
| if (sheet && !sheet->disabled() && sheet->isCSSStyleSheet()) |
| activeSheet = static_cast<CSSStyleSheet*>(sheet); |
| } else if ((n->isHTMLElement() && (n->hasTagName(linkTag) || n->hasTagName(styleTag))) || (n->isSVGElement() && n->hasTagName(SVGNames::styleTag))) { |
| Element* e = toElement(n); |
| AtomicString title = e->getAttribute(titleAttr); |
| bool enabledViaScript = false; |
| if (e->hasLocalName(linkTag)) { |
| // <LINK> element |
| HTMLLinkElement* linkElement = toHTMLLinkElement(n); |
| enabledViaScript = linkElement->isEnabledViaScript(); |
| if (!linkElement->isDisabled() && linkElement->styleSheetIsLoading()) { |
| // it is loading but we should still decide which style sheet set to use |
| if (!enabledViaScript && !title.isEmpty() && collections->preferredStylesheetSetName().isEmpty()) { |
| const AtomicString& rel = e->getAttribute(relAttr); |
| if (!rel.contains("alternate")) { |
| collections->setPreferredStylesheetSetName(title); |
| collections->setSelectedStylesheetSetName(title); |
| } |
| } |
| |
| continue; |
| } |
| sheet = linkElement->sheet(); |
| if (!sheet) |
| title = nullAtom; |
| } else if (n->isSVGElement() && n->hasTagName(SVGNames::styleTag)) { |
| sheet = static_cast<SVGStyleElement*>(n)->sheet(); |
| } else { |
| sheet = static_cast<HTMLStyleElement*>(n)->sheet(); |
| } |
| |
| if (sheet && !sheet->disabled() && sheet->isCSSStyleSheet()) |
| activeSheet = static_cast<CSSStyleSheet*>(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 && sheet && !title.isEmpty()) { |
| // Yes, we have a title. |
| if (collections->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->hasLocalName(styleTag) || !rel.contains("alternate")) { |
| collections->setPreferredStylesheetSetName(title); |
| collections->setSelectedStylesheetSetName(title); |
| } |
| } |
| if (title != collections->preferredStylesheetSetName()) |
| activeSheet = 0; |
| } |
| |
| if (rel.contains("alternate") && title.isEmpty()) |
| activeSheet = 0; |
| } |
| if (sheet) |
| styleSheets.append(sheet); |
| if (activeSheet) |
| activeSheets.append(activeSheet); |
| } |
| } |
| |
| static void collectActiveCSSStyleSheetsFromSeamlessParents(Vector<RefPtr<CSSStyleSheet> >& sheets, Document* document) |
| { |
| HTMLIFrameElement* seamlessParentIFrame = document->seamlessParentIFrame(); |
| if (!seamlessParentIFrame) |
| return; |
| sheets.append(seamlessParentIFrame->document()->styleSheetCollection()->activeAuthorStyleSheets()); |
| } |
| |
| bool StyleSheetCollectionForDocument::updateActiveStyleSheets(DocumentStyleSheetCollection* collections, StyleResolverUpdateMode updateMode) |
| { |
| Vector<RefPtr<StyleSheet> > styleSheets; |
| Vector<RefPtr<CSSStyleSheet> > activeCSSStyleSheets; |
| activeCSSStyleSheets.append(collections->injectedAuthorStyleSheets()); |
| activeCSSStyleSheets.append(collections->documentAuthorStyleSheets()); |
| collectActiveCSSStyleSheetsFromSeamlessParents(activeCSSStyleSheets, document()); |
| collectStyleSheets(collections, styleSheets, activeCSSStyleSheets); |
| |
| StyleResolverUpdateType styleResolverUpdateType; |
| bool requiresFullStyleRecalc; |
| analyzeStyleSheetChange(updateMode, activeAuthorStyleSheets(), activeCSSStyleSheets, styleResolverUpdateType, requiresFullStyleRecalc); |
| |
| if (styleResolverUpdateType == Reconstruct) { |
| document()->clearStyleResolver(); |
| } else { |
| StyleResolver* styleResolver = document()->styleResolverIfExists(); |
| ASSERT(styleResolver); |
| // FIXME: We might have already had styles in child treescope. In this case, we cannot use buildScopedStyleTreeInDocumentOrder. |
| // Need to change "false" to some valid condition. |
| styleResolver->setBuildScopedStyleTreeInDocumentOrder(false); |
| if (styleResolverUpdateType == Reset) { |
| resetAllRuleSetsInTreeScope(styleResolver); |
| styleResolver->appendAuthorStyleSheets(0, activeCSSStyleSheets); |
| } else { |
| ASSERT(styleResolverUpdateType == Additive); |
| styleResolver->appendAuthorStyleSheets(m_activeAuthorStyleSheets.size(), activeCSSStyleSheets); |
| } |
| } |
| m_scopingNodesForStyleScoped.didRemoveScopingNodes(); |
| m_activeAuthorStyleSheets.swap(activeCSSStyleSheets); |
| m_styleSheetsForStyleSheetList.swap(styleSheets); |
| updateUsesRemUnits(); |
| |
| return requiresFullStyleRecalc; |
| } |
| |
| } |
