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

/*
 * Copyright (C) 2000 Peter Kelly (pmk@post.com)
 * Copyright (C) 2006 Apple Inc. All rights reserved.
 *
 * 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 ProcessingInstruction_h
#define ProcessingInstruction_h

#include "core/dom/CharacterData.h"
#include "core/dom/StyleEngineContext.h"
#include "core/fetch/ResourceOwner.h"
#include "core/fetch/StyleSheetResource.h"
#include "core/fetch/StyleSheetResourceClient.h"

namespace blink {

class StyleSheet;
class CSSStyleSheet;
class EventListener;

class ProcessingInstruction final : public CharacterData,
                                    private ResourceOwner<StyleSheetResource> {
  DEFINE_WRAPPERTYPEINFO();
  USING_GARBAGE_COLLECTED_MIXIN(ProcessingInstruction);

 public:
  static ProcessingInstruction* create(Document&,
                                       const String& target,
                                       const String& data);
  ~ProcessingInstruction() override;
  DECLARE_VIRTUAL_TRACE();

  const String& target() const { return m_target; }
  const String& localHref() const { return m_localHref; }
  StyleSheet* sheet() const { return m_sheet.get(); }

  bool isCSS() const { return m_isCSS; }
  bool isXSL() const { return m_isXSL; }

  void didAttributeChanged();
  bool isLoading() const;

  // For XSLT
  class DetachableEventListener : public GarbageCollectedMixin {
   public:
    virtual ~DetachableEventListener() {}
    virtual EventListener* toEventListener() = 0;
    // Detach event listener from its processing instruction.
    virtual void detach() = 0;

    DEFINE_INLINE_VIRTUAL_TRACE() {}
  };

  void setEventListenerForXSLT(DetachableEventListener* listener) {
    m_listenerForXSLT = listener;
  }
  EventListener* eventListenerForXSLT();
  void clearEventListenerForXSLT();

 private:
  ProcessingInstruction(Document&, const String& target, const String& data);

  String nodeName() const override;
  NodeType getNodeType() const override;
  Node* cloneNode(bool deep) override;

  InsertionNotificationRequest insertedInto(ContainerNode*) override;
  void removedFrom(ContainerNode*) override;

  bool checkStyleSheet(String& href, String& charset);
  void process(const String& href, const String& charset);

  void setCSSStyleSheet(const String& href,
                        const KURL& baseURL,
                        const String& charset,
                        const CSSStyleSheetResource*) override;
  void setXSLStyleSheet(const String& href,
                        const KURL& baseURL,
                        const String& sheet) override;

  bool sheetLoaded() override;

  void parseStyleSheet(const String& sheet);
  void clearSheet();

  String debugName() const override { return "ProcessingInstruction"; }

  String m_target;
  String m_localHref;
  String m_title;
  String m_media;
  Member<StyleSheet> m_sheet;
  StyleEngineContext m_styleEngineContext;
  bool m_loading;
  bool m_alternate;
  bool m_isCSS;
  bool m_isXSL;

  Member<DetachableEventListener> m_listenerForXSLT;
};

DEFINE_NODE_TYPE_CASTS(ProcessingInstruction,
                       getNodeType() == Node::kProcessingInstructionNode);

inline bool isXSLStyleSheet(const Node& node) {
  return node.getNodeType() == Node::kProcessingInstructionNode &&
         toProcessingInstruction(node).isXSL();
}

}  // namespace blink

#endif  // ProcessingInstruction_h