library/cpp/json/yson/json2yson.h


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#pragma once

#include <library/cpp/json/json_reader.h> 
#include <library/cpp/json/json_value.h> 
#include <library/cpp/yson/writer.h>

namespace NJson2Yson {
    class TJsonBuilderImpl: public NYson::TYsonConsumerBase {
    public:
        TJsonBuilderImpl(NJson::TJsonCallbacks* parserCallbacks)
            : ParserCallbacks_(parserCallbacks)
        {
        }

        void OnStringScalar(TStringBuf value) override {
            ParserCallbacks_->OnString(value);
        }

        void OnInt64Scalar(i64 value) override {
            ParserCallbacks_->OnInteger(value);
        }

        void OnUint64Scalar(ui64 value) override {
            ParserCallbacks_->OnUInteger(value);
        }

        void OnDoubleScalar(double value) override {
            ParserCallbacks_->OnDouble(value);
        }

        void OnBooleanScalar(bool value) override {
            ParserCallbacks_->OnBoolean(value);
        }

        void OnEntity() override {
            ParserCallbacks_->OnNull();
        }

        void OnBeginList() override {
            ParserCallbacks_->OnOpenArray();
        }

        void OnListItem() override {
        }

        void OnEndList() override {
            ParserCallbacks_->OnCloseArray();
        }

        void OnBeginMap() override {
            ParserCallbacks_->OnOpenMap();
        }

        void OnKeyedItem(TStringBuf key) override {
            ParserCallbacks_->OnMapKey(key);
        }

        void OnEndMap() override {
            ParserCallbacks_->OnCloseMap();
        }

        void OnBeginAttributes() override {
        }

        void OnEndAttributes() override {
        }

    private:
        NJson::TJsonCallbacks* ParserCallbacks_;
    };

    template <typename TBase>
    class TSkipAttributesProxy: public TBase {
    public:
        template <typename... TArgs>
        TSkipAttributesProxy<TBase>(TArgs&&... args)
            : TBase(std::forward<TArgs>(args)...)
        {
        }

        void OnStringScalar(TStringBuf value) override {
            if (AttributesDepth == 0) {
                TBase::OnStringScalar(value);
            }
        }

        void OnInt64Scalar(i64 value) override {
            if (AttributesDepth == 0) {
                TBase::OnInt64Scalar(value);
            }
        }

        void OnUint64Scalar(ui64 value) override {
            if (AttributesDepth == 0) {
                TBase::OnUint64Scalar(value);
            }
        }

        void OnDoubleScalar(double value) override {
            if (AttributesDepth == 0) {
                TBase::OnDoubleScalar(value);
            }
        }

        void OnBooleanScalar(bool value) override {
            if (AttributesDepth == 0) {
                TBase::OnBooleanScalar(value);
            }
        }

        void OnEntity() override {
            if (AttributesDepth == 0) {
                TBase::OnEntity();
            }
        }

        void OnBeginList() override {
            if (AttributesDepth == 0) {
                TBase::OnBeginList();
            }
        }

        void OnListItem() override {
            if (AttributesDepth == 0) {
                TBase::OnListItem();
            }
        }

        void OnEndList() override {
            if (AttributesDepth == 0) {
                TBase::OnEndList();
            }
        }

        void OnBeginMap() override {
            if (AttributesDepth == 0) {
                TBase::OnBeginMap();
            }
        }

        void OnKeyedItem(TStringBuf key) override {
            if (AttributesDepth == 0) {
                TBase::OnKeyedItem(key);
            }
        }

        void OnEndMap() override {
            if (AttributesDepth == 0) {
                TBase::OnEndMap();
            }
        }

        void OnBeginAttributes() override {
            ++AttributesDepth;
        }

        void OnEndAttributes() override {
            --AttributesDepth;
            Y_ASSERT(AttributesDepth >= 0);
        }

    private:
        int AttributesDepth = 0;
    };

    using TJsonBuilder = TSkipAttributesProxy<TJsonBuilderImpl>;

    void ConvertYson2Json(IInputStream* inputStream, IOutputStream* outputStream);
    void ConvertYson2Json(TStringBuf yson, IOutputStream* outputStream);
    TString ConvertYson2Json(TStringBuf yson);

    bool DeserializeYsonAsJsonValue(IInputStream* inputStream, NJson::TJsonValue* outputValue, bool throwOnError = false);
    bool DeserializeYsonAsJsonValue(TStringBuf str, NJson::TJsonValue* outputValue, bool throwOnError = false);

    void SerializeJsonValueAsYson(const NJson::TJsonValue& inputValue, NYson::TYsonWriter* ysonWriter);
    void SerializeJsonValueAsYson(const NJson::TJsonValue& inputValue, IOutputStream* outputStream);
    void SerializeJsonValueAsYson(const NJson::TJsonValue& inputValue, TString& result);
    TString SerializeJsonValueAsYson(const NJson::TJsonValue& inputValue);
}