library/cpp/protobuf/util/path.h


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#pragma once

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

#include <util/generic/vector.h>

namespace NProtoBuf {
    class TFieldPath { 
    public: 
        TFieldPath(); 
        TFieldPath(const Descriptor* msgType, const TStringBuf& path); // throws exception if path doesn't exist 
        TFieldPath(const TVector<const FieldDescriptor*>& path); 
        TFieldPath(const TFieldPath&) = default;
        TFieldPath& operator=(const TFieldPath&) = default;

        bool InitUnsafe(const Descriptor* msgType, const TStringBuf path); // noexcept 
        void Init(const Descriptor* msgType, const TStringBuf& path);      // throws 

        const TVector<const FieldDescriptor*>& Fields() const { 
            return Path; 
        } 

        void AddField(const FieldDescriptor* field) { 
            Path.push_back(field); 
        } 

        const Descriptor* ParentType() const { 
            return Empty() ? nullptr : Path.front()->containing_type(); 
        } 

        const FieldDescriptor* FieldDescr() const { 
            return Empty() ? nullptr : Path.back(); 
        } 

        bool Empty() const { 
            return Path.empty(); 
        } 

        explicit operator bool() const { 
            return !Empty(); 
        } 

        bool operator!() const { 
            return Empty(); 
        } 

    private: 
        TVector<const FieldDescriptor*> Path; 
    }; 

}