1 /* 2 * Copyright (C) 2013 Google, Inc. 3 * Copyright (C) 1999 Lars Knoll (knoll@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 #include "core/css/resolver/ElementResolveContext.h" 26 #include "core/dom/Element.h" 27 28 namespace WebCore { 29 30 class Element; 31 class Node; 32 class RenderStyle; 33 class RuleFeatureSet; 34 class RuleSet; 35 class SpaceSplitString; 36 class StyleResolver; 37 38 class SharedStyleFinder { 39 public: 40 // RuleSets are passed non-const as the act of matching against them can cause them 41 // to be compacted. :( SharedStyleFinder(const ElementResolveContext & context,const RuleFeatureSet & features,RuleSet * siblingRuleSet,RuleSet * uncommonAttributeRuleSet,StyleResolver & styleResolver)42 SharedStyleFinder(const ElementResolveContext& context, 43 const RuleFeatureSet& features, RuleSet* siblingRuleSet, 44 RuleSet* uncommonAttributeRuleSet, StyleResolver& styleResolver) 45 : m_elementAffectedByClassRules(false) 46 , m_features(features) 47 , m_siblingRuleSet(siblingRuleSet) 48 , m_uncommonAttributeRuleSet(uncommonAttributeRuleSet) 49 , m_styleResolver(styleResolver) 50 , m_context(context) 51 { } 52 53 RenderStyle* findSharedStyle(); 54 55 private: 56 Element* findElementForStyleSharing() const; 57 58 // Only used when we're collecting stats on styles. 59 bool documentContainsValidCandidate() const; 60 61 bool classNamesAffectedByRules(const SpaceSplitString&) const; 62 63 bool canShareStyleWithElement(Element& candidate) const; 64 bool canShareStyleWithControl(Element& candidate) const; 65 bool sharingCandidateHasIdenticalStyleAffectingAttributes(Element& candidate) const; 66 bool matchesRuleSet(RuleSet*); 67 element()68 Element& element() const { return *m_context.element(); } document()69 Document& document() const { return element().document(); } 70 71 bool m_elementAffectedByClassRules; 72 const RuleFeatureSet& m_features; 73 RuleSet* m_siblingRuleSet; 74 RuleSet* m_uncommonAttributeRuleSet; 75 StyleResolver& m_styleResolver; 76 const ElementResolveContext& m_context; 77 }; 78 79 } // namespace WebCore 80 81 #endif // SharedStyleFinder_h 82