library/cpp/yson_pull/reader.h


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#pragma once

#include "event.h"
#include "input.h"
#include "stream_type.h"

#include <util/system/yassert.h>

#include <memory>

namespace NYsonPull {
    namespace NDetail { 
        class reader_impl; 
    } 

    //! \brief YSON reader facade class. 
    //! 
    //! Owns an input stream. 
    class TReader { 
        THolder<NInput::IStream> Stream_;
        THolder<NDetail::reader_impl> Impl_;

    public: 
        TReader(THolder<NInput::IStream> stream, EStreamType mode); 
        TReader(TReader&&) noexcept; 
        ~TReader(); 

        //! \brief Advance stream to next event and return it. 
        //! 
        //! Any event data is invalidated by a call to NextEvent();
        const TEvent& NextEvent();

        //! \brief Get last returned event. 
        const TEvent& LastEvent() const noexcept;
    }; 

}