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/*
* Copyright (C) 2013 Google, Inc.
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* 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
* 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.
*/
#ifndef SharedStyleFinder_h
#define SharedStyleFinder_h
#include "core/css/resolver/ElementResolveContext.h"
#include "core/dom/Element.h"
namespace WebCore {
class Element;
class Node;
class RenderStyle;
class RuleFeatureSet;
class RuleSet;
class SpaceSplitString;
class StyleResolver;
class SharedStyleFinder {
public:
// RuleSets are passed non-const as the act of matching against them can cause them
// to be compacted. :(
SharedStyleFinder(const ElementResolveContext& context,
const RuleFeatureSet& features, RuleSet* siblingRuleSet,
RuleSet* uncommonAttributeRuleSet, StyleResolver& styleResolver)
: m_elementAffectedByClassRules(false)
, m_features(features)
, m_siblingRuleSet(siblingRuleSet)
, m_uncommonAttributeRuleSet(uncommonAttributeRuleSet)
, m_styleResolver(styleResolver)
, m_context(context)
{ }
RenderStyle* findSharedStyle();
private:
Element* findElementForStyleSharing() const;
// Only used when we're collecting stats on styles.
bool documentContainsValidCandidate() const;
bool classNamesAffectedByRules(const SpaceSplitString&) const;
bool canShareStyleWithElement(Element& candidate) const;
bool canShareStyleWithControl(Element& candidate) const;
bool sharingCandidateHasIdenticalStyleAffectingAttributes(Element& candidate) const;
bool matchesRuleSet(RuleSet*);
Element& element() const { return *m_context.element(); }
Document& document() const { return element().document(); }
bool m_elementAffectedByClassRules;
const RuleFeatureSet& m_features;
RuleSet* m_siblingRuleSet;
RuleSet* m_uncommonAttributeRuleSet;
StyleResolver& m_styleResolver;
const ElementResolveContext& m_context;
};
} // namespace WebCore
#endif // SharedStyleFinder_h
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