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/*
* 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/DocumentStyleSheetCollection.h"
#include "HTMLNames.h"
#include "RuntimeEnabledFeatures.h"
#include "SVGNames.h"
#include "core/css/CSSStyleSheet.h"
#include "core/css/resolver/StyleResolver.h"
#include "core/dom/Document.h"
#include "core/dom/Element.h"
#include "core/dom/ProcessingInstruction.h"
#include "core/dom/StyleEngine.h"
#include "core/html/HTMLIFrameElement.h"
#include "core/html/HTMLLinkElement.h"
#include "core/html/HTMLStyleElement.h"
#include "core/frame/Settings.h"
#include "core/svg/SVGStyleElement.h"
namespace WebCore {
using namespace HTMLNames;
DocumentStyleSheetCollection::DocumentStyleSheetCollection(TreeScope& treeScope)
: StyleSheetCollection(treeScope)
{
ASSERT(treeScope.rootNode() == treeScope.rootNode()->document());
}
void DocumentStyleSheetCollection::collectStyleSheetsFromCandidates(StyleEngine* engine, StyleSheetCollectionBase& collection, DocumentStyleSheetCollection::CollectFor collectFor)
{
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 = toProcessingInstruction(n);
// Don't apply XSL transforms to already transformed documents -- <rdar://problem/4132806>
if (RuntimeEnabledFeatures::xsltEnabled() && 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 = toCSSStyleSheet(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() && engine->preferredStylesheetSetName().isEmpty()) {
const AtomicString& rel = e->getAttribute(relAttr);
if (!rel.contains("alternate")) {
engine->setPreferredStylesheetSetName(title);
engine->setSelectedStylesheetSetName(title);
}
}
continue;
}
sheet = linkElement->sheet();
if (!sheet)
title = nullAtom;
} else if (n->isSVGElement() && n->hasTagName(SVGNames::styleTag)) {
sheet = toSVGStyleElement(n)->sheet();
} else {
sheet = toHTMLStyleElement(n)->sheet();
}
if (sheet && !sheet->disabled() && sheet->isCSSStyleSheet())
activeSheet = toCSSStyleSheet(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 (engine->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")) {
engine->setPreferredStylesheetSetName(title);
engine->setSelectedStylesheetSetName(title);
}
}
if (title != engine->preferredStylesheetSetName())
activeSheet = 0;
}
if (rel.contains("alternate") && title.isEmpty())
activeSheet = 0;
}
if (sheet && collectFor == CollectForList)
collection.appendSheetForList(sheet);
if (activeSheet)
collection.appendActiveStyleSheet(activeSheet);
}
}
static void collectActiveCSSStyleSheetsFromSeamlessParents(StyleSheetCollectionBase& collection, Document* document)
{
HTMLIFrameElement* seamlessParentIFrame = document->seamlessParentIFrame();
if (!seamlessParentIFrame)
return;
collection.appendActiveStyleSheets(seamlessParentIFrame->document().styleEngine()->activeAuthorStyleSheets());
}
void DocumentStyleSheetCollection::collectStyleSheets(StyleEngine* engine, StyleSheetCollectionBase& collection, DocumentStyleSheetCollection::CollectFor colletFor)
{
ASSERT(document()->styleEngine() == engine);
collection.appendActiveStyleSheets(engine->injectedAuthorStyleSheets());
collection.appendActiveStyleSheets(engine->documentAuthorStyleSheets());
collectActiveCSSStyleSheetsFromSeamlessParents(collection, document());
collectStyleSheetsFromCandidates(engine, collection, colletFor);
}
bool DocumentStyleSheetCollection::updateActiveStyleSheets(StyleEngine* engine, StyleResolverUpdateMode updateMode)
{
StyleSheetCollectionBase collection;
engine->collectDocumentActiveStyleSheets(collection);
StyleSheetChange change;
analyzeStyleSheetChange(updateMode, collection, change);
if (change.styleResolverUpdateType == Reconstruct) {
engine->clearMasterResolver();
engine->resetFontSelector();
} else if (StyleResolver* styleResolver = engine->resolver()) {
// 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 (change.styleResolverUpdateType != Additive) {
ASSERT(change.styleResolverUpdateType == Reset || change.styleResolverUpdateType == ResetStyleResolverAndFontSelector);
resetAllRuleSetsInTreeScope(styleResolver);
if (change.styleResolverUpdateType == ResetStyleResolverAndFontSelector)
engine->resetFontSelector();
styleResolver->removePendingAuthorStyleSheets(m_activeAuthorStyleSheets);
styleResolver->lazyAppendAuthorStyleSheets(0, collection.activeAuthorStyleSheets());
} else {
styleResolver->lazyAppendAuthorStyleSheets(m_activeAuthorStyleSheets.size(), collection.activeAuthorStyleSheets());
}
} else if (change.styleResolverUpdateType == ResetStyleResolverAndFontSelector) {
engine->resetFontSelector();
}
m_scopingNodesForStyleScoped.didRemoveScopingNodes();
collection.swap(*this);
updateUsesRemUnits();
return change.requiresFullStyleRecalc;
}
}
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