[Experimental] CSSSerializer Proof-of-concept

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

Index: third_party/WebKit/Source/core/css/CSSSelector.cpp
diff --git a/third_party/WebKit/Source/core/css/CSSSelector.cpp b/third_party/WebKit/Source/core/css/CSSSelector.cpp
index 2910c45972c2fd945cbc0bc497337606b813006f..7f11b53521354ced81f1b41922d4b7be3c1c6bfc 100644
--- a/third_party/WebKit/Source/core/css/CSSSelector.cpp
+++ b/third_party/WebKit/Source/core/css/CSSSelector.cpp
@@ -28,6 +28,8 @@
 #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"
@@ -50,6 +52,23 @@ struct SameSizeAsCSSSelector {
 
 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);
@@ -881,6 +900,19 @@ bool CSSSelector::matchNth(int count) const
     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)
@@ -894,6 +926,25 @@ 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)
 {
@@ -909,4 +960,20 @@ bool CSSSelector::RareData::matchNth(int count)
     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