library/cpp/protobuf/json/field_option.h


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#pragma once

#include <google/protobuf/descriptor.h>
#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/message.h>

namespace NProtobufJson {
    // Functor that defines whether given field has some option set to true 
    // 
    // Example: 
    // message T { 
    //     optional stroka some_field = 1 [(some_option) = true]; 
    // } 
    // 
    template <typename TFieldOptionExtensionId> 
    class TFieldOptionFunctor { 
    public: 
        TFieldOptionFunctor(const TFieldOptionExtensionId& option, bool positive = true) 
            : Option(option) 
            , Positive(positive) 
        { 
        } 

        bool operator()(const NProtoBuf::Message&, const NProtoBuf::FieldDescriptor* field) const { 
            const NProtoBuf::FieldOptions& opt = field->options(); 
            const bool val = opt.GetExtension(Option); 
            return Positive ? val : !val; 
        } 

    private: 
        const TFieldOptionExtensionId& Option; 
        bool Positive; 
    }; 
 
    template <typename TFieldOptionExtensionId> 
    TFieldOptionFunctor<TFieldOptionExtensionId> MakeFieldOptionFunctor(const TFieldOptionExtensionId& option, bool positive = true) { 
        return TFieldOptionFunctor<TFieldOptionExtensionId>(option, positive); 
    }

}