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/*
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "Styleable.h"
#include <wtf/HashMap.h>
namespace WebCore {
class Document;
class Element;
class Node;
class RenderStyle;
class SpaceSplitString;
class StyledElement;
namespace Style {
class RuleSet;
class ScopeRuleSets;
class Update;
struct SelectorMatchingState;
class SharingResolver {
public:
SharingResolver(const Document&, const ScopeRuleSets&, SelectorMatchingState&);
std::unique_ptr<RenderStyle> resolve(const Styleable&, const Update&);
private:
struct Context;
StyledElement* findSibling(const Context&, Node*, unsigned& count) const;
Node* locateCousinList(const Element* parent) const;
bool canShareStyleWithElement(const Context&, const StyledElement& candidateElement) const;
bool styleSharingCandidateMatchesRuleSet(const StyledElement&, const RuleSet*) const;
bool sharingCandidateHasIdenticalStyleAffectingAttributes(const Context&, const StyledElement& sharingCandidate) const;
bool classNamesAffectedByRules(const SpaceSplitString& classNames) const;
CheckedRef<const Document> m_document;
const ScopeRuleSets& m_ruleSets;
SelectorMatchingState& m_selectorMatchingState;
// FIXME: Use WeakHashMap or UncheckedKeyHashMap<CheckedPtr, CheckedPtr>.
UncheckedKeyHashMap<const Element*, const Element*> m_elementsSharingStyle;
};
}
}
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