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* Copyright (C) 2013 Google, Inc.
* Copyright (C) 1999 Lars Knoll (
* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple 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
* 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.
#ifndef SharedStyleFinder_h
#define SharedStyleFinder_h
namespace WebCore {
class Element;
class ElementResolveContext;
class Node;
class RenderStyle;
class RuleFeatureSet;
class RuleSet;
class SpaceSplitString;
class StyleResolver;
class SharedStyleFinder {
// FIXME: StyleResolver* only used for calling styleSharingCandidateMatchesRuleSet.
// RuleSets are passed non-const as the act of matching against them can cause them
// to be compacted. :(
SharedStyleFinder(const RuleFeatureSet& features, RuleSet* siblingRuleSet,
RuleSet* uncommonAttributeRuleSet, StyleResolver* styleResolver)
: m_elementAffectedByClassRules(false)
, m_features(features)
, m_siblingRuleSet(siblingRuleSet)
, m_uncommonAttributeRuleSet(uncommonAttributeRuleSet)
, m_styleResolver(styleResolver)
{ }
// FIXME: It is not necessarily safe to call this method more than once.
RenderStyle* locateSharedStyle(const ElementResolveContext&, RenderStyle* newStyle);
Node* locateCousinList(Element* parent, unsigned& visitedNodeCount) const;
Element* findSiblingForStyleSharing(const ElementResolveContext&, Node*, unsigned& count) const;
// Only used when we're collecting stats on styles
Element* searchDocumentForSharedStyle(const ElementResolveContext&) const;
bool classNamesAffectedByRules(const SpaceSplitString&) const;
bool canShareStyleWithElement(const ElementResolveContext&, Element*) const;
bool canShareStyleWithControl(const ElementResolveContext&, Element*) const;
bool sharingCandidateHasIdenticalStyleAffectingAttributes(const ElementResolveContext&, Element*) const;
bool m_elementAffectedByClassRules;
const RuleFeatureSet& m_features;
RuleSet* m_siblingRuleSet;
RuleSet* m_uncommonAttributeRuleSet;
StyleResolver* m_styleResolver;
} // namespace WebCore
#endif // SharedStyleFinder_h