[Experimental] CSSSerializer Proof-of-concept

third_party/WebKit/Source/core/css/CSSSelector.cpp

 /*
  * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
  *               1999 Waldo Bastian (bastian@kde.org)
  *               2001 Andreas Schlapbach (schlpbch@iam.unibe.ch)
  *               2001-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 10 matching lines @@
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "core/css/CSSSelector.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/CSSMarkup.h"
 #include "core/css/CSSSelectorList.h"
+#include "core/css/serializer/CSSDeserializeStream.h"
+#include "core/css/serializer/CSSSerializeStream.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/Assertions.h"
 #include "wtf/HashMap.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuilder.h"
 #include <algorithm>
 
 #ifndef NDEBUG
 #include <stdio.h>
 #endif
 
 namespace blink {
 
 using namespace HTMLNames;
 
 struct SameSizeAsCSSSelector {
     unsigned bitfields;
     void* pointers[1];
 };
 
 static_assert(sizeof(CSSSelector) == sizeof(SameSizeAsCSSSelector), "CSSSelector should stay small");
 
+CSSSelector::CSSSelector(CSSDeserializeStream* stream)
+{
+    CSDEBUG("CSSSelector::ctor deserialize\n");
+    m_bitfields = stream->readUnsigned();
+    if (m_hasRareData) {
+        m_data.m_rareData = RareData::deserialize(stream).leakRef();
+    } else if (m_match == Tag) {
+        QualifiedName tagQName = stream->readQualifiedName();
+        m_data.m_tagQName = tagQName.impl();
+        m_data.m_tagQName->ref();
+    } else {
+        AtomicString value = stream->readAtomicString();
+        m_data.m_value = value.impl();
+        m_data.m_value->ref();
+    }
+}
+
 void CSSSelector::createRareData()
 {
     ASSERT(m_match != Tag);
     if (m_hasRareData)
         return;
     AtomicString value(m_data.m_value);
     if (m_data.m_value)
         m_data.m_value->deref();
     m_data.m_rareData = RareData::create(value).leakRef();
     m_hasRareData = true;
@@ skipping 811 matching lines @@
     m_data.m_rareData->m_bits.m_nth.m_a = a;
     m_data.m_rareData->m_bits.m_nth.m_b = b;
 }
 
 bool CSSSelector::matchNth(int count) const
 {
     ASSERT(m_hasRareData);
     return m_data.m_rareData->matchNth(count);
 }
 
+void CSSSelector::serialize(CSSSerializeStream* stream) const
+{
+    CSDEBUG("CSSSelector::serialize "); CSSHOW(selectorText());
+    stream->writeUnsigned(m_bitfields);
+    if (m_hasRareData) {
+        m_data.m_rareData->serialize(stream);
+    } else if (m_match == Tag) {
+        stream->writeQualifiedName(tagQName());
+    } else {
+        stream->writeAtomicString(value());
+    }
+}
+
 CSSSelector::RareData::RareData(const AtomicString& value)
     : m_matchingValue(value)
     , m_serializingValue(value)
     , m_bits()
     , m_attribute(anyQName())
     , m_argument(nullAtom)
 {
 }
 
 CSSSelector::RareData::~RareData()
 {
 }
 
+PassRefPtr<CSSSelector::RareData> CSSSelector::RareData::deserialize(CSSDeserializeStream* stream)
+{
+    AtomicString matchingValue = stream->readAtomicString();
+    RefPtr<RareData> rareData = create(matchingValue);
+    rareData->m_serializingValue = stream->readAtomicString();;
+
+    rareData->m_bits.m_nth.m_a = stream->readInt();
+    rareData->m_bits.m_nth.m_b = stream->readInt();
+    rareData->m_attribute = stream->readQualifiedName();
+    rareData->m_argument = stream->readAtomicString();
+    bool hasSelectorList = stream->readBool();
+    if (hasSelectorList) {
+        rareData->m_selectorList = adoptPtr(new CSSSelectorList());
+        *rareData->m_selectorList = CSSSelectorList::deserialize(stream);
+    }
+
+    return rareData.release();
+}
+
 // a helper function for checking nth-arguments
 bool CSSSelector::RareData::matchNth(int count)
 {
     if (!nthAValue())
         return count == nthBValue();
     if (nthAValue() > 0) {
         if (count < nthBValue())
             return false;
         return (count - nthBValue()) % nthAValue() == 0;
     }
     if (count > nthBValue())
         return false;
     return (nthBValue() - count) % (-nthAValue()) == 0;
 }
 
+void CSSSelector::RareData::serialize(CSSSerializeStream* stream)
+{
+    stream->writeAtomicString(m_matchingValue);
+    stream->writeAtomicString(m_serializingValue);
+    stream->writeInt(m_bits.m_nth.m_a);
+    stream->writeInt(m_bits.m_nth.m_b);
+    stream->writeQualifiedName(m_attribute);
+    stream->writeAtomicString(m_argument);
+    if (m_selectorList) {
+        stream->writeBool(true);
+        m_selectorList->serialize(stream);
+    } else {
+        stream->writeBool(false);
+    }
+}
+
 } // namespace blink