JSONLoader.h

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// This is a custom visitor for rapidjson::Value.
// The interface described by the link below:
// https://internal.dunescience.org/doxygen/classrapidjson_1_1Handler.html
 
#include <cstdint>
#include <vector>
#include <list>
#include <string>
#include <memory>
#include <unordered_map>
#include "vl_fwd.h"
 
namespace vl
{
    class JSONLoader
    {
        struct ContainerInfo;
 
    public:
        JSONLoader(vl::Object& object) : mObject(object) {}
        ContainerInfo* GetCurrentContainer();
        ContainerInfo* PushContainer(vl::Var* ptr, const std::string& name);
        void PopContainer();
 
        // rapidjson interface
        typedef char Ch;
        typedef size_t SizeType;
        bool Null();
        bool Bool(bool b);
        bool Int(int i);
        bool Uint(unsigned i);
        bool Int64(int64_t i);
        bool Uint64(uint64_t i);
        bool Double(double d);
        bool RawNumber(const Ch* str, SizeType length, bool copy);
        bool String(const Ch* str, SizeType length, bool copy);
        bool StartObject();
        bool Key(const Ch* str, SizeType length, bool copy);
        bool EndObject(SizeType memberCount);
        bool StartArray();
        bool EndArray(SizeType elementCount);
 
    protected:
        bool AddVar(const vl::VarPtr& ptr);
        // 3 following functions: Memorize current object or a list as a container for the next parsed elements
        void PushNewList(ContainerInfo* parentContainer, const std::string& listName);
        void PushNewObject(ContainerInfo* c, const std::string& objectName);
        ContainerInfo* PushNewContainer(
            bool isObject
            , bool isList
            , ContainerInfo* parentConainer
            , const std::string& newContainerName
        );
        // Store references to prototypes which types have not been parsed yet
        void StoreUnresolvedRef(vl::Object& ref);
        // Link eventually parsed type objects to the prototypes
        void ResolveRefs();
 
    private:
        struct ContainerInfo
        {
            ContainerInfo(vl::Var& containerInstance, const std::string& containerName)
                : var(containerInstance)
                , name(containerName)
            {}
            vl::Var& var;
            std::string name;
        };
    private:
        vl::Object& mObject;
        std::vector<ContainerInfo> mStack;
        std::string mCurrentKey;
        bool mCurrentProto = false;
        std::list<vl::Object*> mUnresolvedRefs;
        std::unordered_map<std::string, vl::Object*> mTypeRefs;
    };
}