graphbuilderadapter.h

#ifndef GRAPHBUILDERADAPTER_H_62B23520_7C8E_11DE_8A39_0800200C9A66
#define GRAPHBUILDERADAPTER_H_62B23520_7C8E_11DE_8A39_0800200C9A66

#if defined(_MSC_VER) ||                                            \
    (defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || \
     (__GNUC__ >= 4))  // GCC supports "pragma once" correctly since 3.4
#pragma once
#endif

#include <cstdlib>
#include <map>
#include <stack>

#include "yaml-cpp/anchor.h"
#include "yaml-cpp/contrib/anchordict.h"
#include "yaml-cpp/emitterstyle.h"
#include "yaml-cpp/eventhandler.h"

namespace YAML {
class GraphBuilderInterface;
struct Mark;
}  // namespace YAML

namespace YAML {
class GraphBuilderAdapter : public EventHandler {
 public:
  GraphBuilderAdapter(GraphBuilderInterface& builder)
      : m_builder(builder),
        m_containers{},
        m_anchors{},
        m_pRootNode(nullptr),
        m_pKeyNode(nullptr) {}
  GraphBuilderAdapter(const GraphBuilderAdapter&) = delete;
  GraphBuilderAdapter(GraphBuilderAdapter&&) = delete;
  GraphBuilderAdapter& operator=(const GraphBuilderAdapter&) = delete;
  GraphBuilderAdapter& operator=(GraphBuilderAdapter&&) = delete;

  virtual void OnDocumentStart(const Mark& mark) { (void)mark; }
  virtual void OnDocumentEnd() {}

  virtual void OnNull(const Mark& mark, anchor_t anchor);
  virtual void OnAlias(const Mark& mark, anchor_t anchor);
  virtual void OnScalar(const Mark& mark, const std::string& tag,
                        anchor_t anchor, const std::string& value);

  virtual void OnSequenceStart(const Mark& mark, const std::string& tag,
                               anchor_t anchor, EmitterStyle::value style);
  virtual void OnSequenceEnd();

  virtual void OnMapStart(const Mark& mark, const std::string& tag,
                          anchor_t anchor, EmitterStyle::value style);
  virtual void OnMapEnd();

  void* RootNode() const { return m_pRootNode; }

 private:
  struct ContainerFrame {
    ContainerFrame(void* pSequence)
        : pContainer(pSequence), pPrevKeyNode(&sequenceMarker) {}
    ContainerFrame(void* pMap, void* pPreviousKeyNode)
        : pContainer(pMap), pPrevKeyNode(pPreviousKeyNode) {}

    void* pContainer;
    void* pPrevKeyNode;

    bool isMap() const { return pPrevKeyNode != &sequenceMarker; }

   private:
    static int sequenceMarker;
  };
  typedef std::stack<ContainerFrame> ContainerStack;
  typedef AnchorDict<void*> AnchorMap;

  GraphBuilderInterface& m_builder;
  ContainerStack m_containers;
  AnchorMap m_anchors;
  void* m_pRootNode;
  void* m_pKeyNode;

  void* GetCurrentParent() const;
  void RegisterAnchor(anchor_t anchor, void* pNode);
  void DispositionNode(void* pNode);
};
}  // namespace YAML

#endif  // GRAPHBUILDERADAPTER_H_62B23520_7C8E_11DE_8A39_0800200C9A66