[Experimental] CSSSerializer Proof-of-concept

third_party/WebKit/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 11 matching lines @@
 #ifndef CSSSelector_h
 #define CSSSelector_h
 
 #include "core/CoreExport.h"
 #include "core/dom/QualifiedName.h"
 #include "core/style/ComputedStyleConstants.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 
 namespace blink {
+class CSSDeserializeStream;
 class CSSSelectorList;
+class CSSSerializeStream;
 
 // This class represents a selector for a StyleRule.
 
 // CSS selector representation is somewhat complicated and subtle. A representative list of selectors is
 // in CSSSelectorTest; run it in a debug build to see useful debugging output.
 //
 // ** tagHistory() and relation():
 //
 // Selectors are represented as a linked list of simple selectors (defined more or less according to
 // http://www.w3.org/TR/css3-selectors/#simple-selectors-dfn). The tagHistory() method returns the next
@@ skipping 29 matching lines @@
 // ** Attribute selectors.
 //
 // Attribute selectors return the attribute name in the attribute() method. The value() method returns the value matched against
 // in case of selectors like [attr="value"].
 //
 class CORE_EXPORT CSSSelector {
     USING_FAST_MALLOC_WITH_TYPE_NAME(blink::CSSSelector);
 public:
     CSSSelector();
     CSSSelector(const CSSSelector&);
+    CSSSelector(CSSDeserializeStream*);
     explicit CSSSelector(const QualifiedName&, bool tagIsImplicit = false);
 
     ~CSSSelector();
 
     String selectorText(const String& rightSide = "") const;
 
     bool operator==(const CSSSelector&) const;
 
     // http://www.w3.org/TR/css3-selectors/#specificity
     // We use 256 as the base of the specificity number system.
@@ skipping 188 matching lines @@
 
     enum LinkMatchMask { MatchLink = 1, MatchVisited = 2, MatchAll = MatchLink | MatchVisited };
     unsigned computeLinkMatchType() const;
 
     bool isForPage() const { return m_isForPage; }
     void setForPage() { m_isForPage = true; }
 
     bool relationIsAffectedByPseudoContent() const { return m_relationIsAffectedByPseudoContent; }
     void setRelationIsAffectedByPseudoContent() { m_relationIsAffectedByPseudoContent = true; }
 
+    void serialize(CSSSerializeStream*) const;
+
 private:
-    unsigned m_relation               : 3; // enum Relation
-    unsigned m_match                  : 4; // enum Match
-    unsigned m_pseudoType             : 8; // enum PseudoType
-    unsigned m_isLastInSelectorList   : 1;
-    unsigned m_isLastInTagHistory     : 1;
-    unsigned m_hasRareData            : 1;
-    unsigned m_isForPage              : 1;
-    unsigned m_tagIsImplicit          : 1;
-    unsigned m_relationIsAffectedByPseudoContent  : 1;
+    union {
+        struct {
+            unsigned m_relation : 3; // enum Relation
+            unsigned m_match : 4; // enum Match
+            unsigned m_pseudoType : 8; // enum PseudoType
+            unsigned m_isLastInSelectorList : 1;
+            unsigned m_isLastInTagHistory : 1;
+            unsigned m_hasRareData : 1;
+            unsigned m_isForPage : 1;
+            unsigned m_tagIsImplicit : 1;
+            unsigned m_relationIsAffectedByPseudoContent : 1;
+        };
+        unsigned m_bitfields;
+    };
 
     void setPseudoType(PseudoType pseudoType)
     {
         m_pseudoType = pseudoType;
         ASSERT(static_cast<PseudoType>(m_pseudoType) == pseudoType); // using a bitfield.
     }
 
     unsigned specificityForOneSelector() const;
     unsigned specificityForPage() const;
 
     // Hide.
     CSSSelector& operator=(const CSSSelector&);
 
     struct RareData : public RefCounted<RareData> {
         static PassRefPtr<RareData> create(const AtomicString& value) { return adoptRef(new RareData(value)); }
+        static PassRefPtr<RareData> deserialize(CSSDeserializeStream*);
         ~RareData();
 
         bool matchNth(int count);
         int nthAValue() const { return m_bits.m_nth.m_a; }
         int nthBValue() const { return m_bits.m_nth.m_b; }
+        void serialize(CSSSerializeStream*);
 
         AtomicString m_matchingValue;
         AtomicString m_serializingValue;
         union {
             struct {
                 int m_a; // Used for :nth-*
                 int m_b; // Used for :nth-*
             } m_nth;
             AttributeMatchType m_attributeMatchType; // used for attribute selector (with value)
         } m_bits;
@@ skipping 159 matching lines @@
     if (m_hasRareData)
         return m_data.m_rareData->m_serializingValue;
     // AtomicString is really just a StringImpl* so the cast below is safe.
     // FIXME: Perhaps call sites could be changed to accept StringImpl?
     return *reinterpret_cast<const AtomicString*>(&m_data.m_value);
 }
 
 } // namespace blink
 
 #endif // CSSSelector_h