*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/css/ElementRuleCollector.h

 /*
  * 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,
@@ skipping 16 matching lines @@
 #include "core/css/resolver/ElementResolveContext.h"
 #include "core/css/resolver/MatchRequest.h"
 #include "core/css/resolver/MatchResult.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 namespace WebCore {
 
 class CSSStyleSheet;
 class CSSRuleList;
-class RenderRegion;
 class RuleData;
 class RuleSet;
 class ScopedStyleResolver;
 class SelectorFilter;
 class StaticCSSRuleList;
 
 typedef unsigned CascadeScope;
 typedef unsigned CascadeOrder;
 
 const CascadeScope ignoreCascadeScope = 0;
@@ skipping 42 matching lines @@
 // FIXME: Currently it modifies the RenderStyle but should not!
 class ElementRuleCollector {
     WTF_MAKE_NONCOPYABLE(ElementRuleCollector);
 public:
     ElementRuleCollector(const ElementResolveContext&, const SelectorFilter&, RenderStyle* = 0);
     ~ElementRuleCollector();
 
     void setMode(SelectorChecker::Mode mode) { m_mode = mode; }
     void setPseudoStyleRequest(const PseudoStyleRequest& request) { m_pseudoStyleRequest = request; }
     void setSameOriginOnly(bool f) { m_sameOriginOnly = f; }
-    void setRegionForStyling(const RenderRegion* regionForStyling) { m_regionForStyling = regionForStyling; }
 
     void setMatchingUARules(bool matchingUARules) { m_matchingUARules = matchingUARules; }
     bool hasAnyMatchingRules(RuleSet*);
 
     MatchResult& matchedResult();
     PassRefPtr<StyleRuleList> matchedStyleRuleList();
     PassRefPtr<CSSRuleList> matchedCSSRuleList();
 
     void collectMatchingRules(const MatchRequest&, RuleRange&, SelectorChecker::BehaviorAtBoundary = SelectorChecker::DoesNotCrossBoundary, CascadeScope = ignoreCascadeScope, CascadeOrder = ignoreCascadeOrder);
-    void collectMatchingRulesForRegion(const MatchRequest&, RuleRange&, SelectorChecker::BehaviorAtBoundary = SelectorChecker::DoesNotCrossBoundary, CascadeScope = ignoreCascadeScope, CascadeOrder = ignoreCascadeOrder);
     void sortAndTransferMatchedRules();
     void clearMatchedRules();
     void addElementStyleProperties(const StylePropertySet*, bool isCacheable = true);
 
     unsigned lastMatchedRulesPosition() const { return m_matchedRules ? m_matchedRules->size() : 0; }
     void sortMatchedRulesFrom(unsigned position);
     void sortAndTransferMatchedRulesWithOnlySortBySpecificity();
 
 private:
     void collectRuleIfMatches(const RuleData&, SelectorChecker::BehaviorAtBoundary, CascadeScope, CascadeOrder, const MatchRequest&, RuleRange&);
@@ skipping 10 matching lines @@
     void addMatchedRule(const RuleData*, unsigned specificity, CascadeScope, CascadeOrder, unsigned styleSheetIndex, const CSSStyleSheet* parentStyleSheet);
 
     StaticCSSRuleList* ensureRuleList();
     StyleRuleList* ensureStyleRuleList();
 
 private:
     const ElementResolveContext& m_context;
     const SelectorFilter& m_selectorFilter;
     RefPtr<RenderStyle> m_style; // FIXME: This can be mutated during matching!
 
-    const RenderRegion* m_regionForStyling;
     PseudoStyleRequest m_pseudoStyleRequest;
     SelectorChecker::Mode m_mode;
     bool m_canUseFastReject;
     bool m_sameOriginOnly;
     bool m_matchingUARules;
 
     OwnPtr<Vector<MatchedRule, 32> > m_matchedRules;
 
     // Output.
     RefPtr<StaticCSSRuleList> m_cssRuleList;
     RefPtr<StyleRuleList> m_styleRuleList;
     MatchResult m_result;
 };
 
 } // namespace WebCore
 
 #endif // ElementRuleCollector_h