Split out String, URI and CustomIdent from CSSPrimitiveValue

Source/core/css/CSSStringValue.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CSSStringValue_h
+#define CSSStringValue_h
+
+#include "core/CoreExport.h"
+#include "core/css/CSSValue.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefCounted.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+class CORE_EXPORT CSSStringValue : public CSSValue {
+public:
+    enum SerializationType { SerializeAsString, SerializeAsCustomIdentifier, SerializeAsURI };
+
+    static PassRefPtrWillBeRawPtr<CSSStringValue> create(const String& str, SerializationType serializationType)
+    {
+        return adoptRefWillBeNoop(new CSSStringValue(str, serializationType));
+    }
+
+    ~CSSStringValue();
+
+    String getStringValue() const { return m_string; }
+    SerializationType serializationType() const { return m_serializationType; }
+
+    String customCSSText() const;
+
+    bool equals(const CSSStringValue& other) const
+    {
+        return m_serializationType == other.m_serializationType
+            && equal(m_string, other.m_string);
+    }
+
+    DECLARE_TRACE_AFTER_DISPATCH();
+
+private:
+    CSSStringValue(const String& str, SerializationType serializationType)
+        : CSSValue(StringClass)
+        , m_string(str.impl())
+        , m_serializationType(serializationType)
+    {
+        if (m_string)
+            m_string->ref();
+    }
+
+    StringImpl* m_string;

[Timothy Loh, 2015/08/31 06:32:47]

..just store a String :\

+    SerializationType m_serializationType;
+};
+
+DEFINE_CSS_VALUE_TYPE_CASTS(CSSStringValue, isStringValue());
+
+} // namespace
+
+#endif // CSSStringValue_h