Move PseudoElements storage to their own object.

third_party/WebKit/Source/core/dom/PseudoElementData.h

+// Copyright 2016 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 PseudoElementData_h
+#define PseudoElementData_h
+
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+class PseudoElementData final : public GarbageCollected<PseudoElementData> {
+    WTF_MAKE_NONCOPYABLE(PseudoElementData);
+public:
+    static PseudoElementData* create();
+    void setPseudoElement(PseudoId, PseudoElement*);
+    PseudoElement* pseudoElement(PseudoId) const;
+    bool hasPseudoElements() const;
+    void clearPseudoElements();
+    DEFINE_INLINE_TRACE()
+    {
+        visitor->trace(m_generatedBefore);
+        visitor->trace(m_generatedAfter);
+        visitor->trace(m_generatedFirstLetter);
+        visitor->trace(m_backdrop);
+    }
+private:
+    PseudoElementData() = default;
+    Member<PseudoElement> m_generatedBefore;
+    Member<PseudoElement> m_generatedAfter;
+    Member<PseudoElement> m_generatedFirstLetter;
+    Member<PseudoElement> m_backdrop;
+};
+
+inline PseudoElementData* PseudoElementData::create()
+{
+    return new PseudoElementData();
+}
+
+inline bool PseudoElementData::hasPseudoElements() const
+{
+    return m_generatedBefore || m_generatedAfter || m_backdrop || m_generatedFirstLetter;
+}
+
+inline void PseudoElementData::clearPseudoElements()
+{
+    setPseudoElement(PseudoIdBefore, nullptr);
+    setPseudoElement(PseudoIdAfter, nullptr);
+    setPseudoElement(PseudoIdBackdrop, nullptr);
+    setPseudoElement(PseudoIdFirstLetter, nullptr);
+}
+
+inline void PseudoElementData::setPseudoElement(PseudoId pseudoId, PseudoElement* element)
+{
+    switch (pseudoId) {
+    case PseudoIdBefore:
+        if (m_generatedBefore)
+            m_generatedBefore->dispose();
+        m_generatedBefore = element;
+        break;
+    case PseudoIdAfter:
+        if (m_generatedAfter)
+            m_generatedAfter->dispose();
+        m_generatedAfter = element;
+        break;
+    case PseudoIdBackdrop:
+        if (m_backdrop)
+            m_backdrop->dispose();
+        m_backdrop = element;
+        break;
+    case PseudoIdFirstLetter:
+        if (m_generatedFirstLetter)
+            m_generatedFirstLetter->dispose();
+        m_generatedFirstLetter = element;
+        break;
+    default:
+        ASSERT_NOT_REACHED();
+    }
+}
+
+inline PseudoElement* PseudoElementData::pseudoElement(PseudoId pseudoId) const
+{
+    switch (pseudoId) {
+    case PseudoIdBefore:
+        return m_generatedBefore;
+    case PseudoIdAfter:
+        return m_generatedAfter;
+    case PseudoIdBackdrop:
+        return m_backdrop;
+    case PseudoIdFirstLetter:
+        return m_generatedFirstLetter;
+    default:
+        return nullptr;
+    }
+}
+
+} // namespace blink
+
+#endif // PseudoElementData_h