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Instead of trying to match the actual attribute rules, lets just look at the HashSet of attribute names. This is faster, though possibly less optimal if you use compound rules like .foo[attr]. That's rare though, and removing this extra RuleSet will allow simplifying SelectorChecker since hasAnyMatchingRules required a special mode where it tried to match selectors but ignored if the scope could really match. This paves the way to moving the RuleFeatureSet to be per-TreeScope instead of per-Document. I also made the API of classNamesAffectedByRules match the newly added attributesAffectedByRules to make SharedStyleFinder consistent. R=ojan@chromium.org Review URL: https://codereview.chromium.org/796583002
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
/*
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* Copyright (C) 2013 Google, Inc.
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* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
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* Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef SKY_ENGINE_CORE_CSS_RESOLVER_SHAREDSTYLEFINDER_H_
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#define SKY_ENGINE_CORE_CSS_RESOLVER_SHAREDSTYLEFINDER_H_
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#include "sky/engine/core/css/resolver/ElementResolveContext.h"
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#include "sky/engine/core/dom/Element.h"
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namespace blink {
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class Element;
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class Node;
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class RenderStyle;
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class RuleFeatureSet;
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class RuleSet;
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class SpaceSplitString;
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class StyleResolver;
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class SharedStyleFinder {
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STACK_ALLOCATED();
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public:
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// RuleSets are passed non-const as the act of matching against them can cause them
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// to be compacted. :(
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SharedStyleFinder(const ElementResolveContext& context,
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const RuleFeatureSet& features, StyleResolver& styleResolver)
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: m_elementAffectedByClassRules(false)
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, m_features(features)
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, m_styleResolver(styleResolver)
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, m_context(context)
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{ }
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RenderStyle* findSharedStyle();
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private:
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Element* findElementForStyleSharing() const;
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// Only used when we're collecting stats on styles.
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bool documentContainsValidCandidate() const;
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bool classNamesAffectedByRules(const Element&) const;
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bool attributesAffectedByRules(const Element&) const;
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bool canShareStyleWithElement(Element& candidate) const;
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bool sharingCandidateHasIdenticalStyleAffectingAttributes(Element& candidate) const;
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bool sharingCandidateCanShareHostStyles(Element& candidate) const;
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bool sharingCandidateDistributedToSameInsertionPoint(Element& candidate) const;
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Element& element() const { return *m_context.element(); }
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Document& document() const { return element().document(); }
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bool m_elementAffectedByClassRules;
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const RuleFeatureSet& m_features;
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StyleResolver& m_styleResolver;
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const ElementResolveContext& m_context;
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};
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} // namespace blink
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#endif // SKY_ENGINE_CORE_CSS_RESOLVER_SHAREDSTYLEFINDER_H_
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