Introduce DEFINE_CONTENT_DATA_TYPE_CASTS, and use it

Source/core/rendering/style/ContentData.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * 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
@@ skipping 48 matching lines @@
     void setNext(PassOwnPtr<ContentData> next) { m_next = next; }
 
     virtual bool equals(const ContentData&) const = 0;
 
 private:
     virtual PassOwnPtr<ContentData> cloneInternal() const = 0;
 
     OwnPtr<ContentData> m_next;
 };
 
+#define DEFINE_CONTENT_DATA_TYPE_CASTS(typeName) \
+    DEFINE_TYPE_CASTS(typeName##ContentData, ContentData, content, content->is##typeName(), content.is##typeName())
+
 class ImageContentData FINAL : public ContentData {
     friend class ContentData;
 public:
     const StyleImage* image() const { return m_image.get(); }
     StyleImage* image() { return m_image.get(); }
     void setImage(PassRefPtr<StyleImage> image) { m_image = image; }
 
     virtual bool isImage() const OVERRIDE { return true; }
     virtual RenderObject* createRenderer(Document&, RenderStyle*) const OVERRIDE;
 
@@ skipping 12 matching lines @@
 
     virtual PassOwnPtr<ContentData> cloneInternal() const OVERRIDE
     {
         RefPtr<StyleImage> image = const_cast<StyleImage*>(this->image());
         return create(image.release());
     }
 
     RefPtr<StyleImage> m_image;
 };
 
+DEFINE_CONTENT_DATA_TYPE_CASTS(Image);
+
 class TextContentData FINAL : public ContentData {
     friend class ContentData;
 public:
     const String& text() const { return m_text; }
     void setText(const String& text) { m_text = text; }
 
     virtual bool isText() const OVERRIDE { return true; }
     virtual RenderObject* createRenderer(Document&, RenderStyle*) const OVERRIDE;
 
     virtual bool equals(const ContentData& data) const OVERRIDE
     {
         if (!data.isText())
             return false;
         return static_cast<const TextContentData&>(data).text() == text();
     }
 
 private:
     TextContentData(const String& text)
         : m_text(text)
     {
     }
 
     virtual PassOwnPtr<ContentData> cloneInternal() const OVERRIDE { return create(text()); }
 
     String m_text;
 };
 
+DEFINE_CONTENT_DATA_TYPE_CASTS(Text);
+
 class CounterContentData FINAL : public ContentData {
     friend class ContentData;
 public:
     const CounterContent* counter() const { return m_counter.get(); }
     void setCounter(PassOwnPtr<CounterContent> counter) { m_counter = counter; }
 
     virtual bool isCounter() const OVERRIDE { return true; }
     virtual RenderObject* createRenderer(Document&, RenderStyle*) const OVERRIDE;
 
 private:
@@ skipping 11 matching lines @@
     virtual bool equals(const ContentData& data) const OVERRIDE
     {
         if (!data.isCounter())
             return false;
         return *static_cast<const CounterContentData&>(data).counter() == *counter();
     }
 
     OwnPtr<CounterContent> m_counter;
 };
 
+DEFINE_CONTENT_DATA_TYPE_CASTS(Counter);
+
 class QuoteContentData FINAL : public ContentData {
     friend class ContentData;
 public:
     QuoteType quote() const { return m_quote; }
     void setQuote(QuoteType quote) { m_quote = quote; }
 
     virtual bool isQuote() const OVERRIDE { return true; }
     virtual RenderObject* createRenderer(Document&, RenderStyle*) const OVERRIDE;
 
     virtual bool equals(const ContentData& data) const OVERRIDE
     {
         if (!data.isQuote())
             return false;
         return static_cast<const QuoteContentData&>(data).quote() == quote();
     }
 
 private:
     QuoteContentData(QuoteType quote)
         : m_quote(quote)
     {
     }
 
     virtual PassOwnPtr<ContentData> cloneInternal() const OVERRIDE { return create(quote()); }
 
     QuoteType m_quote;
 };
 
+DEFINE_CONTENT_DATA_TYPE_CASTS(Quote);
+
 inline bool operator==(const ContentData& a, const ContentData& b)
 {
     return a.equals(b);
 }
 
 inline bool operator!=(const ContentData& a, const ContentData& b)
 {
     return !(a == b);
 }
 
 } // namespace blink
 
 #endif // ContentData_h