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

/*
 * Copyright (C) 2014 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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 THE COPYRIGHT
 * OWNER 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 DocumentStyleSheetCollector_h
#define DocumentStyleSheetCollector_h

#include "bindings/core/v8/TraceWrapperMember.h"
#include "platform/heap/Handle.h"
#include "wtf/HashSet.h"
#include "wtf/Vector.h"

namespace blink {

class CSSStyleSheet;
class Document;
class StyleSheet;
class StyleSheetCollection;

class DocumentStyleSheetCollector {
  // This class contains references to two on-heap collections, therefore
  // it's unhealthy to have it anywhere but on the stack, where stack
  // scanning will keep them alive.
  STACK_ALLOCATED();

 public:
  friend class ImportedDocumentStyleSheetCollector;

  DocumentStyleSheetCollector(StyleSheetCollection*,
                              HeapVector<Member<StyleSheet>>*,
                              HeapHashSet<Member<Document>>*);
  ~DocumentStyleSheetCollector();

  void appendActiveStyleSheets(
      const HeapVector<TraceWrapperMember<CSSStyleSheet>>&);
  void appendActiveStyleSheet(CSSStyleSheet*);
  void appendSheetForList(StyleSheet*);

  bool hasVisited(Document* document) const {
    return m_visitedDocuments->contains(document);
  }
  void willVisit(Document* document) { m_visitedDocuments->add(document); }

 private:
  Member<StyleSheetCollection> m_collection;
  HeapVector<Member<StyleSheet>>* m_styleSheetsForStyleSheetList;
  HeapHashSet<Member<Document>>* m_visitedDocuments;
};

class ActiveDocumentStyleSheetCollector final
    : public DocumentStyleSheetCollector {
 public:
  ActiveDocumentStyleSheetCollector(StyleSheetCollection&);

 private:
  HeapHashSet<Member<Document>> m_visitedDocuments;
};

class ImportedDocumentStyleSheetCollector final
    : public DocumentStyleSheetCollector {
 public:
  ImportedDocumentStyleSheetCollector(DocumentStyleSheetCollector&,
                                      HeapVector<Member<StyleSheet>>&);
};

}  // namespace blink

#endif  // DocumentStyleSheetCollector_h