Make a '::distributed' pseudo element the first-ever client who can accept a relative selector.

Source/core/css/CSSSelector.h

 /*
  * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
  *               1999 Waldo Bastian (bastian@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2008, 2009, 2010, 2013 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 61 matching lines @@
             End, // css3: E[foo$="bar"]
             PagePseudoClass
         };
 
         enum Relation {
             Descendant = 0,
             Child,
             DirectAdjacent,
             IndirectAdjacent,
             SubSelector,
-            ShadowPseudo,
-            ShadowDistributed
+            ShadowPseudo
         };
 
         enum PseudoType {
             PseudoNotParsed = 0,
             PseudoUnknown,
             PseudoEmpty,
             PseudoFirstChild,
             PseudoFirstOfType,
             PseudoLastChild,
             PseudoLastOfType,
@@ skipping 119 matching lines @@
 
         bool parseNth() const;
         bool matchNth(int count) const;
 
         bool matchesPseudoElement() const;
         bool isUnknownPseudoElement() const;
         bool isCustomPseudoElement() const;
         bool isSiblingSelector() const;
         bool isAttributeSelector() const;
         bool isDistributedPseudoElement() const;
-        bool isShadowDistributed() const;
 
         Relation relation() const { return static_cast<Relation>(m_relation); }
 
         bool isLastInSelectorList() const { return m_isLastInSelectorList; }
         void setLastInSelectorList() { m_isLastInSelectorList = true; }
         bool isLastInTagHistory() const { return m_isLastInTagHistory; }
         void setNotLastInTagHistory() { m_isLastInTagHistory = false; }
 
         bool isSimple() const;
 
         bool isForPage() const { return m_isForPage; }
         void setForPage() { m_isForPage = true; }
 
+        bool relationIsForShadowDistributed() const { return m_relationIsForShadowDistributed; }
+        void setRelationIsForShadowDistributed() { m_relationIsForShadowDistributed = true; }
+
         unsigned m_relation           : 3; // enum Relation
         mutable unsigned m_match      : 4; // enum Match
         mutable unsigned m_pseudoType : 8; // PseudoType
 
     private:
         mutable unsigned m_parsedNth      : 1; // Used for :nth-*
         unsigned m_isLastInSelectorList   : 1;
         unsigned m_isLastInTagHistory     : 1;
         unsigned m_hasRareData            : 1;
         unsigned m_isForPage              : 1;
         unsigned m_tagIsForNamespaceRule  : 1;
+        unsigned m_relationIsForShadowDistributed  : 1;
 
         unsigned specificityForOneSelector() const;
         unsigned specificityForPage() const;
         void extractPseudoType() const;
 
         // Hide.
         CSSSelector& operator=(const CSSSelector&);
 
         struct RareData : public RefCounted<RareData> {
             static PassRefPtr<RareData> create(PassRefPtr<AtomicStringImpl> value) { return adoptRef(new RareData(value)); }
@@ skipping 73 matching lines @@
         || m_match == CSSSelector::Contain
         || m_match == CSSSelector::Begin
         || m_match == CSSSelector::End;
 }
 
 inline bool CSSSelector::isDistributedPseudoElement() const
 {
     return m_match == PseudoElement && pseudoType() == PseudoDistributed;
 }
 
-inline bool CSSSelector::isShadowDistributed() const
-{
-    return m_relation == CSSSelector::ShadowDistributed;
-}
-
 inline void CSSSelector::setValue(const AtomicString& value)
 {
     ASSERT(m_match != Tag);
     ASSERT(m_pseudoType == PseudoNotParsed);
     // Need to do ref counting manually for the union.
     if (m_hasRareData) {
         if (m_data.m_rareData->m_value)
             m_data.m_rareData->m_value->deref();
         m_data.m_rareData->m_value = value.impl();
         m_data.m_rareData->m_value->ref();
         return;
     }
     if (m_data.m_value)
         m_data.m_value->deref();
     m_data.m_value = value.impl();
     m_data.m_value->ref();
 }
 
 inline CSSSelector::CSSSelector()
     : m_relation(Descendant)
     , m_match(Unknown)
     , m_pseudoType(PseudoNotParsed)
     , m_parsedNth(false)
     , m_isLastInSelectorList(false)
     , m_isLastInTagHistory(true)
     , m_hasRareData(false)
     , m_isForPage(false)
     , m_tagIsForNamespaceRule(false)
+    , m_relationIsForShadowDistributed(false)
 {
 }
 
 inline CSSSelector::CSSSelector(const QualifiedName& tagQName, bool tagIsForNamespaceRule)
     : m_relation(Descendant)
     , m_match(Tag)
     , m_pseudoType(PseudoNotParsed)
     , m_parsedNth(false)
     , m_isLastInSelectorList(false)
     , m_isLastInTagHistory(true)
     , m_hasRareData(false)
     , m_isForPage(false)
     , m_tagIsForNamespaceRule(tagIsForNamespaceRule)
+    , m_relationIsForShadowDistributed(false)
 {
     m_data.m_tagQName = tagQName.impl();
     m_data.m_tagQName->ref();
 }
 
 inline CSSSelector::CSSSelector(const CSSSelector& o)
     : m_relation(o.m_relation)
     , m_match(o.m_match)
     , m_pseudoType(o.m_pseudoType)
     , m_parsedNth(o.m_parsedNth)
     , m_isLastInSelectorList(o.m_isLastInSelectorList)
     , m_isLastInTagHistory(o.m_isLastInTagHistory)
     , m_hasRareData(o.m_hasRareData)
     , m_isForPage(o.m_isForPage)
     , m_tagIsForNamespaceRule(o.m_tagIsForNamespaceRule)
+    , m_relationIsForShadowDistributed(o.m_relationIsForShadowDistributed)
 {
     if (o.m_match == Tag) {
         m_data.m_tagQName = o.m_data.m_tagQName;
         m_data.m_tagQName->ref();
     } else if (o.m_hasRareData) {
         m_data.m_rareData = o.m_data.m_rareData;
         m_data.m_rareData->ref();
     } else if (o.m_data.m_value) {
         m_data.m_value = o.m_data.m_value;
         m_data.m_value->ref();
@@ skipping 21 matching lines @@
     ASSERT(m_match != Tag);
     // AtomicString is really just an AtomicStringImpl* so the cast below is safe.
     // FIXME: Perhaps call sites could be changed to accept AtomicStringImpl?
     return *reinterpret_cast<const AtomicString*>(m_hasRareData ? &m_data.m_rareData->m_value : &m_data.m_value);
 }
 
 
 } // namespace WebCore
 
 #endif // CSSSelector_h