dynamic/traits.hpp at master · andrusha97/dynamic · GitHub

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#ifndef COCAINE_DYNAMIC_TYPE_TRAITS_HPP
#define COCAINE_DYNAMIC_TYPE_TRAITS_HPP

#include <cocaine/traits.hpp>

#include "dynamic.hpp"

namespace cocaine { namespace io {

template<>
struct type_traits<dynamic_t>
{
    template<class Stream>
    struct pack_visitor :
        public boost::static_visitor<>
    {
        pack_visitor(msgpack::packer<Stream>& packer) :
            m_packer(packer)
        {
            // pass
        }

        void
        operator()(const dynamic_t::null_t&) const {
            m_packer << msgpack::type::nil();
        }

        void
        operator()(const dynamic_t::bool_t& v) const {
            m_packer << v;
        }

        void
        operator()(const dynamic_t::int_t& v) const {
            m_packer << v;
        }

        void
        operator()(const dynamic_t::double_t& v) const {
            m_packer << v;
        }

        void
        operator()(const dynamic_t::string_t& v) const {
            m_packer << v;
        }

        void
        operator()(const dynamic_t::array_t& v) const {
            m_packer.pack_array(v.size());

            for(size_t i = 0; i < v.size(); ++i) {
                v[i].apply(*this);
            }
        }

        void
        operator()(const dynamic_t::object_t& v) const {
            m_packer.pack_map(v.size());

            for(auto it = v.begin(); it != v.end(); ++it) {
                m_packer << it->first;
                it->second.apply(*this);
            }
        }

    private:
        msgpack::packer<Stream>& m_packer;
    };

    template<class Stream>
    static inline
    void
    pack(msgpack::packer<Stream>& packer, const dynamic_t& source) {
        source.apply(pack_visitor<Stream>(packer));
    }

    static inline
    void
    unpack(const msgpack::object& object, dynamic_t& target) {
        switch(object.type) {
            case msgpack::type::MAP: {
                dynamic_t::object_t container;

                msgpack::object_kv *ptr = object.via.map.ptr,
                                   *const end = ptr + object.via.map.size;

                for(; ptr < end; ++ptr) {
                    if(ptr->key.type != msgpack::type::RAW) {
                        // NOTE: The keys should be strings.
                        throw msgpack::type_error();
                    }

                    unpack(ptr->val, container[ptr->key.as<std::string>()]);
                }

                target = std::move(container);
            } break;

            case msgpack::type::ARRAY: {
                dynamic_t::array_t container;
                container.reserve(object.via.array.size);

                msgpack::object *ptr = object.via.array.ptr,
                                *const end = ptr + object.via.array.size;

                for(unsigned int index = 0; ptr < end; ++ptr, ++index) {
                    container.push_back(dynamic_t());
                    unpack(*ptr, container.back());
                }

                target = std::move(container);
            } break;

            case msgpack::type::RAW: {
                target = object.as<std::string>();
            } break;

            case msgpack::type::DOUBLE: {
                target = object.as<double>();
            } break;

            case msgpack::type::POSITIVE_INTEGER: {
                target = object.as<uint64_t>();
            } break;

            case msgpack::type::NEGATIVE_INTEGER: {
                target = object.as<int64_t>();
            } break;

            case msgpack::type::BOOLEAN: {
                target = object.as<bool>();
            } break;

            case msgpack::type::NIL: {
                target = dynamic_t::null_t();
            }
        }
    }
};

}} // namespace cocaine::io

#endif // COCAINE_DYNAMIC_TYPE_TRAITS_HPP