third_party/blink/renderer/core/inspector/dom_patch_support.h

/*
 * Copyright (C) 2012 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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
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 * this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_INSPECTOR_DOM_PATCH_SUPPORT_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_INSPECTOR_DOM_PATCH_SUPPORT_H_

#include "base/macros.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"

namespace blink {

class ContainerNode;
class DOMEditor;
class Document;
class ExceptionState;
class Node;

class DOMPatchSupport final {
  STACK_ALLOCATED();

 public:
  DOMPatchSupport(DOMEditor*, Document&);

  void PatchDocument(const String& markup);
  Node* PatchNode(Node*, const String& markup, ExceptionState&);

 private:
  class Digest : public GarbageCollectedFinalized<Digest> {
   public:
    explicit Digest(Node* node) : node_(node) {}
    void Trace(blink::Visitor*);

    String sha1_;
    String attrs_sha1_;
    Member<Node> node_;
    HeapVector<Member<Digest>> children_;
  };

  typedef HeapVector<std::pair<Member<Digest>, wtf_size_t>> ResultMap;
  typedef HeapHashMap<String, Member<Digest>> UnusedNodesMap;

  bool InnerPatchNode(Digest* old_node, Digest* new_node, ExceptionState&);
  std::pair<ResultMap, ResultMap> Diff(
      const HeapVector<Member<Digest>>& old_children,
      const HeapVector<Member<Digest>>& new_children);
  bool InnerPatchChildren(ContainerNode*,
                          const HeapVector<Member<Digest>>& old_children,
                          const HeapVector<Member<Digest>>& new_children,
                          ExceptionState&);
  Digest* CreateDigest(Node*, UnusedNodesMap*);
  bool InsertBeforeAndMarkAsUsed(ContainerNode*,
                                 Digest*,
                                 Node* anchor,
                                 ExceptionState&);
  bool RemoveChildAndMoveToNew(Digest*, ExceptionState&);
  void MarkNodeAsUsed(Digest*);
  Document& GetDocument() const { return *document_; }

  Member<DOMEditor> dom_editor_;
  Member<Document> document_;

  UnusedNodesMap unused_nodes_map_;

  DISALLOW_COPY_AND_ASSIGN(DOMPatchSupport);
};

}  // namespace blink

#endif  // !defined(DOMPatchSupport_h)