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

Source/core/css/RuleSet.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 19 matching lines @@
 #include "wtf/Forward.h"
 #include "wtf/HashMap.h"
 #include "wtf/LinkedStack.h"
 
 namespace WebCore {
 
 enum AddRuleFlags {
     RuleHasNoSpecialState         = 0,
     RuleHasDocumentSecurityOrigin = 1,
     RuleCanUseFastCheckSelector   = 1 << 1,
-    RuleIsInRegionRule            = 1 << 2,
 };
 
 enum PropertyWhitelistType {
     PropertyWhitelistNone   = 0,
-    PropertyWhitelistRegion,
     PropertyWhitelistCue
 };
 
 class CSSSelector;
 class MediaQueryEvaluator;
-class StyleRuleRegion;
 class StyleSheetContents;
 
 struct MinimalRuleData {
     MinimalRuleData(StyleRule* rule, unsigned selectorIndex, AddRuleFlags flags)
     : m_rule(rule)
     , m_selectorIndex(selectorIndex)
     , m_flags(flags)
     {
     }
 
@@ skipping 92 matching lines @@
     }
 
     struct RuleSetSelectorPair {
         RuleSetSelectorPair(const CSSSelector* selector, PassOwnPtr<RuleSet> ruleSet) : selector(selector), ruleSet(ruleSet) { }
         RuleSetSelectorPair(const RuleSetSelectorPair& rs) : selector(rs.selector), ruleSet(const_cast<RuleSetSelectorPair*>(&rs)->ruleSet.release()) { }
 
         const CSSSelector* selector;
         OwnPtr<RuleSet> ruleSet;
     };
 
-    Vector<RuleSetSelectorPair> m_regionSelectorsAndRuleSets;
-
 private:
     typedef HashMap<StringImpl*, OwnPtr<LinkedStack<RuleData> > > PendingRuleMap;
     typedef HashMap<StringImpl*, OwnPtr<RuleData> > CompactRuleMap;
 
     RuleSet()
         : m_ruleCount(0)
     {
     }
 
     void addToRuleSet(StringImpl* key, PendingRuleMap&, const RuleData&);
     void addPageRule(StyleRulePage*);
     void addViewportRule(StyleRuleViewport*);
     void addFontFaceRule(StyleRuleFontFace*);
     void addKeyframesRule(StyleRuleKeyframes*);
-    void addRegionRule(StyleRuleRegion*, bool hasDocumentSecurityOrigin);
 
     void addChildRules(const Vector<RefPtr<StyleRuleBase> >&, const MediaQueryEvaluator& medium, AddRuleFlags);
     bool findBestRuleSetAndAdd(const CSSSelector*, RuleData&);
 
     void compactRules();
     static void compactPendingRules(PendingRuleMap&, CompactRuleMap&);
 
     struct PendingRuleMaps {
         PendingRuleMap idRules;
         PendingRuleMap classRules;
@@ skipping 26 matching lines @@
 
     MediaQueryResultList m_viewportDependentMediaQueryResults;
 
     unsigned m_ruleCount;
     OwnPtr<PendingRuleMaps> m_pendingRules;
 };
 
 } // namespace WebCore
 
 #endif // RuleSet_h