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

Source/core/css/StyleRule.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 2012 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.
  *
@@ skipping 11 matching lines @@
 #include "config.h"
 #include "core/css/StyleRule.h"
 
 #include "RuntimeEnabledFeatures.h"
 #include "core/css/CSSFilterRule.h"
 #include "core/css/CSSFontFaceRule.h"
 #include "core/css/CSSImportRule.h"
 #include "core/css/CSSKeyframesRule.h"
 #include "core/css/CSSMediaRule.h"
 #include "core/css/CSSPageRule.h"
-#include "core/css/CSSRegionRule.h"
 #include "core/css/CSSStyleRule.h"
 #include "core/css/CSSSupportsRule.h"
 #include "core/css/CSSViewportRule.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/StyleRuleImport.h"
 
 namespace WebCore {
 
 struct SameSizeAsStyleRuleBase : public WTF::RefCountedBase {
     unsigned bitfields;
@@ skipping 22 matching lines @@
         return;
     case FontFace:
         delete toStyleRuleFontFace(this);
         return;
     case Media:
         delete toStyleRuleMedia(this);
         return;
     case Supports:
         delete toStyleRuleSupports(this);
         return;
-    case Region:
-        delete toStyleRuleRegion(this);
-        return;
     case Import:
         delete toStyleRuleImport(this);
         return;
     case Keyframes:
         delete toStyleRuleKeyframes(this);
         return;
     case Viewport:
         delete toStyleRuleViewport(this);
         return;
     case Filter:
@@ skipping 14 matching lines @@
     case Style:
         return toStyleRule(this)->copy();
     case Page:
         return toStyleRulePage(this)->copy();
     case FontFace:
         return toStyleRuleFontFace(this)->copy();
     case Media:
         return toStyleRuleMedia(this)->copy();
     case Supports:
         return toStyleRuleSupports(this)->copy();
-    case Region:
-        return toStyleRuleRegion(this)->copy();
     case Import:
         // FIXME: Copy import rules.
         ASSERT_NOT_REACHED();
         return 0;
     case Keyframes:
         return toStyleRuleKeyframes(this)->copy();
     case Viewport:
         return toStyleRuleViewport(this)->copy();
     case Filter:
         return toStyleRuleFilter(this)->copy();
@@ skipping 20 matching lines @@
         break;
     case FontFace:
         rule = CSSFontFaceRule::create(toStyleRuleFontFace(self), parentSheet);
         break;
     case Media:
         rule = CSSMediaRule::create(toStyleRuleMedia(self), parentSheet);
         break;
     case Supports:
         rule = CSSSupportsRule::create(toStyleRuleSupports(self), parentSheet);
         break;
-    case Region:
-        rule = CSSRegionRule::create(toStyleRuleRegion(self), parentSheet);
-        break;
     case Import:
         rule = CSSImportRule::create(toStyleRuleImport(self), parentSheet);
         break;
     case Keyframes:
         rule = CSSKeyframesRule::create(toStyleRuleKeyframes(self), parentSheet);
         break;
     case Viewport:
         rule = CSSViewportRule::create(toStyleRuleViewport(self), parentSheet);
         break;
     case Filter:
@@ skipping 142 matching lines @@
 {
 }
 
 StyleRuleSupports::StyleRuleSupports(const StyleRuleSupports& o)
     : StyleRuleGroup(o)
     , m_conditionText(o.m_conditionText)
     , m_conditionIsSupported(o.m_conditionIsSupported)
 {
 }
 
-StyleRuleRegion::StyleRuleRegion(Vector<OwnPtr<CSSParserSelector> >* selectors, Vector<RefPtr<StyleRuleBase> >& adoptRules)
-    : StyleRuleGroup(Region, adoptRules)
-{
-    ASSERT(RuntimeEnabledFeatures::cssRegionsEnabled());
-    m_selectorList.adoptSelectorVector(*selectors);
-}
-
-StyleRuleRegion::StyleRuleRegion(const StyleRuleRegion& o)
-    : StyleRuleGroup(o)
-    , m_selectorList(o.m_selectorList)
-{
-    ASSERT(RuntimeEnabledFeatures::cssRegionsEnabled());
-}
-
 StyleRuleViewport::StyleRuleViewport()
     : StyleRuleBase(Viewport)
 {
 }
 
 StyleRuleViewport::StyleRuleViewport(const StyleRuleViewport& o)
     : StyleRuleBase(o)
     , m_properties(o.m_properties->mutableCopy())
 {
 }
@@ skipping 37 matching lines @@
         m_properties = m_properties->mutableCopy();
     return toMutableStylePropertySet(m_properties);
 }
 
 void StyleRuleFilter::setProperties(PassRefPtr<StylePropertySet> properties)
 {
     m_properties = properties;
 }
 
 } // namespace WebCore