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      1 /*
      2  * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org)
      3  *           (C) 1999 Antti Koivisto (koivisto (at) kde.org)
      4  *           (C) 2001 Dirk Mueller (mueller (at) kde.org)
      5  *           (C) 2006 Alexey Proskuryakov (ap (at) webkit.org)
      6  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
      7  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
      8  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
      9  * Copyright (C) 2013 Google Inc. All rights reserved.
     10  *
     11  * This library is free software; you can redistribute it and/or
     12  * modify it under the terms of the GNU Library General Public
     13  * License as published by the Free Software Foundation; either
     14  * version 2 of the License, or (at your option) any later version.
     15  *
     16  * This library is distributed in the hope that it will be useful,
     17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     19  * Library General Public License for more details.
     20  *
     21  * You should have received a copy of the GNU Library General Public License
     22  * along with this library; see the file COPYING.LIB.  If not, write to
     23  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     24  * Boston, MA 02110-1301, USA.
     25  */
     26 
     27 #include "config.h"
     28 #include "core/dom/DocumentStyleSheetCollection.h"
     29 
     30 #include "core/css/resolver/StyleResolver.h"
     31 #include "core/dom/Document.h"
     32 #include "core/dom/DocumentStyleSheetCollector.h"
     33 #include "core/dom/ProcessingInstruction.h"
     34 #include "core/dom/StyleEngine.h"
     35 #include "core/dom/StyleSheetCandidate.h"
     36 #include "platform/RuntimeEnabledFeatures.h"
     37 
     38 namespace WebCore {
     39 
     40 DocumentStyleSheetCollection::DocumentStyleSheetCollection(TreeScope& treeScope)
     41     : TreeScopeStyleSheetCollection(treeScope)
     42 {
     43     ASSERT(treeScope.rootNode() == treeScope.rootNode().document());
     44 }
     45 
     46 void DocumentStyleSheetCollection::collectStyleSheetsFromCandidates(StyleEngine* engine, DocumentStyleSheetCollector& collector)
     47 {
     48     DocumentOrderedList::iterator begin = m_styleSheetCandidateNodes.begin();
     49     DocumentOrderedList::iterator end = m_styleSheetCandidateNodes.end();
     50     for (DocumentOrderedList::iterator it = begin; it != end; ++it) {
     51         Node* n = *it;
     52         StyleSheetCandidate candidate(*n);
     53 
     54         ASSERT(!candidate.isXSL());
     55         if (candidate.isImport()) {
     56             Document* document = candidate.importedDocument();
     57             if (!document)
     58                 continue;
     59             if (collector.hasVisited(document))
     60                 continue;
     61             collector.willVisit(document);
     62             document->styleEngine()->updateStyleSheetsInImport(collector);
     63             continue;
     64         }
     65 
     66         if (candidate.isEnabledAndLoading()) {
     67             // it is loading but we should still decide which style sheet set to use
     68             if (candidate.hasPreferrableName(engine->preferredStylesheetSetName()))
     69                 engine->selectStylesheetSetName(candidate.title());
     70             continue;
     71         }
     72 
     73         StyleSheet* sheet = candidate.sheet();
     74         if (!sheet)
     75             continue;
     76 
     77         if (candidate.hasPreferrableName(engine->preferredStylesheetSetName()))
     78             engine->selectStylesheetSetName(candidate.title());
     79         collector.appendSheetForList(sheet);
     80         if (candidate.canBeActivated(engine->preferredStylesheetSetName()))
     81             collector.appendActiveStyleSheet(toCSSStyleSheet(sheet));
     82     }
     83 }
     84 
     85 void DocumentStyleSheetCollection::collectStyleSheets(StyleEngine* engine, DocumentStyleSheetCollector& collector)
     86 {
     87     ASSERT(document().styleEngine() == engine);
     88     collector.appendActiveStyleSheets(engine->injectedAuthorStyleSheets());
     89     collector.appendActiveStyleSheets(engine->documentAuthorStyleSheets());
     90     collectStyleSheetsFromCandidates(engine, collector);
     91 }
     92 
     93 void DocumentStyleSheetCollection::updateActiveStyleSheets(StyleEngine* engine, StyleResolverUpdateMode updateMode)
     94 {
     95     StyleSheetCollection collection;
     96     ActiveDocumentStyleSheetCollector collector(collection);
     97     collectStyleSheets(engine, collector);
     98 
     99     StyleSheetChange change;
    100     analyzeStyleSheetChange(updateMode, collection, change);
    101 
    102     if (change.styleResolverUpdateType == Reconstruct) {
    103         engine->clearMasterResolver();
    104         // FIMXE: The following depends on whether StyleRuleFontFace was modified or not.
    105         // No need to always-clear font cache.
    106         engine->clearFontCache();
    107     } else if (StyleResolver* styleResolver = engine->resolver()) {
    108         // FIXME: We might have already had styles in child treescope. In this case, we cannot use buildScopedStyleTreeInDocumentOrder.
    109         // Need to change "false" to some valid condition.
    110         styleResolver->setBuildScopedStyleTreeInDocumentOrder(false);
    111         if (change.styleResolverUpdateType != Additive) {
    112             ASSERT(change.styleResolverUpdateType == Reset);
    113             resetAllRuleSetsInTreeScope(styleResolver);
    114             engine->removeFontFaceRules(change.fontFaceRulesToRemove);
    115             styleResolver->removePendingAuthorStyleSheets(m_activeAuthorStyleSheets);
    116             styleResolver->lazyAppendAuthorStyleSheets(0, collection.activeAuthorStyleSheets());
    117         } else {
    118             styleResolver->lazyAppendAuthorStyleSheets(m_activeAuthorStyleSheets.size(), collection.activeAuthorStyleSheets());
    119         }
    120     }
    121     if (change.requiresFullStyleRecalc)
    122         document().setNeedsStyleRecalc(SubtreeStyleChange);
    123 
    124     m_scopingNodesForStyleScoped.didRemoveScopingNodes();
    125 
    126     collection.swap(*this);
    127 
    128     updateUsesRemUnits();
    129 }
    130 
    131 }
    132