text: /*
   * Copyright (C) 2005, 2006, 2008 Apple Inc. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
   * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
   * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #ifndef EditCommand_h
  #define EditCommand_h
  
  #include "core/CoreExport.h"
  #include "core/editing/VisibleSelection.h"
  #include "core/events/InputEvent.h"
  #include "platform/heap/Handle.h"
  
  namespace blink {
  
  class CompositeEditCommand;
  class Document;
  class EditingState;
  
  class CORE_EXPORT EditCommand : public GarbageCollectedFinalized<EditCommand> {
   public:
    virtual ~EditCommand();
  
    virtual void setParent(CompositeEditCommand*);
  
    virtual InputEvent::InputType inputType() const;
  
    virtual bool isSimpleEditCommand() const { return false; }
    virtual bool isCompositeEditCommand() const { return false; }
    bool isTopLevelCommand() const { return !m_parent; }
  
    // The |EditingState*| argument must not be nullptr.
    virtual void doApply(EditingState*) = 0;
  
    // |TypingCommand| will return the text of the last |m_commands|.
    virtual String textDataForInputEvent() const;
  
    DECLARE_VIRTUAL_TRACE();
  
   protected:
    explicit EditCommand(Document&);
  
    Document& document() const { return *m_document.get(); }
    CompositeEditCommand* parent() const { return m_parent; }
  
    // TODO(yosin) |isRenderedCharacter()| should be removed, and we should use
    // |VisiblePosition::characterAfter()| and
    // |VisiblePosition::characterBefore()|.
    static bool isRenderedCharacter(const Position&);
  
   private:
    Member<Document> m_document;
    Member<CompositeEditCommand> m_parent;
  };
  
  enum ShouldAssumeContentIsAlwaysEditable {
    AssumeContentIsAlwaysEditable,
    DoNotAssumeContentIsAlwaysEditable,
  };
  
  class SimpleEditCommand : public EditCommand {
   public:
    virtual void doUnapply() = 0;
    virtual void doReapply();  // calls doApply()
  
   protected:
    explicit SimpleEditCommand(Document& document) : EditCommand(document) {}
  
   private:
    bool isSimpleEditCommand() const final { return true; }
  };
  
  DEFINE_TYPE_CASTS(SimpleEditCommand,
                    EditCommand,
                    command,
                    command->isSimpleEditCommand(),
                    command.isSimpleEditCommand());
  
  }  // namespace blink
  
  #endif  // EditCommand_h
  