third_party/WebKit/Source/core/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
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * 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.
 *
 */

#ifndef ContentData_h
#define ContentData_h

#include "core/style/CounterContent.h"
#include "core/style/StyleImage.h"
#include "wtf/PtrUtil.h"
#include <memory>

namespace blink {

class Document;
class LayoutObject;
class ComputedStyle;

class ContentData : public GarbageCollectedFinalized<ContentData> {
 public:
  static ContentData* create(StyleImage*);
  static ContentData* create(const String&);
  static ContentData* create(std::unique_ptr<CounterContent>);
  static ContentData* create(QuoteType);

  virtual ~ContentData() {}

  virtual bool isCounter() const { return false; }
  virtual bool isImage() const { return false; }
  virtual bool isQuote() const { return false; }
  virtual bool isText() const { return false; }

  virtual LayoutObject* createLayoutObject(Document&, ComputedStyle&) const = 0;

  virtual ContentData* clone() const;

  ContentData* next() const { return m_next.get(); }
  void setNext(ContentData* next) { m_next = next; }

  virtual bool equals(const ContentData&) const = 0;

  DECLARE_VIRTUAL_TRACE();

 private:
  virtual ContentData* cloneInternal() const = 0;

  Member<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(StyleImage* image) {
    ASSERT(image);
    m_image = image;
  }

  bool isImage() const override { return true; }
  LayoutObject* createLayoutObject(Document&, ComputedStyle&) const override;

  bool equals(const ContentData& data) const override {
    if (!data.isImage())
      return false;
    return *static_cast<const ImageContentData&>(data).image() == *image();
  }

  DECLARE_VIRTUAL_TRACE();

 private:
  ImageContentData(StyleImage* image) : m_image(image) { ASSERT(m_image); }

  ContentData* cloneInternal() const override {
    StyleImage* image = const_cast<StyleImage*>(this->image());
    return create(image);
  }

  Member<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; }

  bool isText() const override { return true; }
  LayoutObject* createLayoutObject(Document&, ComputedStyle&) const override;

  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) {}

  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(std::unique_ptr<CounterContent> counter) {
    m_counter = std::move(counter);
  }

  bool isCounter() const override { return true; }
  LayoutObject* createLayoutObject(Document&, ComputedStyle&) const override;

 private:
  CounterContentData(std::unique_ptr<CounterContent> counter)
      : m_counter(std::move(counter)) {}

  ContentData* cloneInternal() const override {
    std::unique_ptr<CounterContent> counterData =
        wrapUnique(new CounterContent(*counter()));
    return create(std::move(counterData));
  }

  bool equals(const ContentData& data) const override {
    if (!data.isCounter())
      return false;
    return *static_cast<const CounterContentData&>(data).counter() ==
           *counter();
  }

  std::unique_ptr<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; }

  bool isQuote() const override { return true; }
  LayoutObject* createLayoutObject(Document&, ComputedStyle&) const override;

  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) {}

  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