1 /* 2 * Copyright (C) 2013 Google, Inc. 3 * Copyright (C) 1999 Lars Knoll (knoll (at) kde.org) 4 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public License 17 * along with this library; see the file COPYING.LIB. If not, write to 18 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA. 20 */ 21 22 #ifndef SharedStyleFinder_h 23 #define SharedStyleFinder_h 24 25 namespace WebCore { 26 27 class Element; 28 class ElementResolveContext; 29 class Node; 30 class RenderStyle; 31 class RuleFeatureSet; 32 class RuleSet; 33 class SpaceSplitString; 34 class StyleResolver; 35 36 class SharedStyleFinder { 37 public: 38 // FIXME: StyleResolver* only used for calling styleSharingCandidateMatchesRuleSet. 39 // RuleSets are passed non-const as the act of matching against them can cause them 40 // to be compacted. :( 41 SharedStyleFinder(const RuleFeatureSet& features, RuleSet* siblingRuleSet, 42 RuleSet* uncommonAttributeRuleSet, StyleResolver* styleResolver) 43 : m_elementAffectedByClassRules(false) 44 , m_features(features) 45 , m_siblingRuleSet(siblingRuleSet) 46 , m_uncommonAttributeRuleSet(uncommonAttributeRuleSet) 47 , m_styleResolver(styleResolver) 48 { } 49 50 // FIXME: It is not necessarily safe to call this method more than once. 51 RenderStyle* locateSharedStyle(const ElementResolveContext&, RenderStyle* newStyle); 52 53 private: 54 Node* locateCousinList(Element* parent, unsigned& visitedNodeCount) const; 55 Element* findSiblingForStyleSharing(const ElementResolveContext&, Node*, unsigned& count) const; 56 57 // Only used when we're collecting stats on styles 58 Element* searchDocumentForSharedStyle(const ElementResolveContext&) const; 59 60 bool classNamesAffectedByRules(const SpaceSplitString&) const; 61 62 bool canShareStyleWithElement(const ElementResolveContext&, Element*) const; 63 bool canShareStyleWithControl(const ElementResolveContext&, Element*) const; 64 bool sharingCandidateHasIdenticalStyleAffectingAttributes(const ElementResolveContext&, Element*) const; 65 66 bool m_elementAffectedByClassRules; 67 const RuleFeatureSet& m_features; 68 RuleSet* m_siblingRuleSet; 69 RuleSet* m_uncommonAttributeRuleSet; 70 StyleResolver* m_styleResolver; 71 }; 72 73 } // namespace WebCore 74 75 #endif // SharedStyleFinder_h 76
