bitsery/include/Serializer.h

//
// Created by Mindaugas Vinkelis on 17.1.3.
//

#ifndef TMP_SERIALIZER_H
#define TMP_SERIALIZER_H

#include "Common.h"
#include <array>

namespace bitsery {

/*
 * functions for range
 */

    template<typename T, typename std::enable_if<std::is_arithmetic<T>::value>::type * = nullptr>
    bool isRangeValid(const T &v, const RangeSpec<T> &r) {
        return !(r.min > v || v > r.max);
    }

    template<typename T, typename std::enable_if<std::is_enum<T>::value>::type * = nullptr>
    bool isRangeValid(const T &v, const RangeSpec<T> &r) {
        using VT = std::underlying_type_t<T>;
        return !(static_cast<VT>(r.min) > static_cast<VT>(v)
                 || static_cast<VT>(v) > static_cast<VT>(r.max));
    }


    template<typename T, typename std::enable_if<std::is_integral<T>::value>::type * = nullptr>
    auto getRangeValue(const T &v, const RangeSpec<T> &r) {
        return static_cast<SAME_SIZE_UNSIGNED<T>>(v - r.min);
    };

    template<typename T, typename std::enable_if<std::is_enum<T>::value>::type * = nullptr>
    auto getRangeValue(const T &v, const RangeSpec<T> &r) {
        return static_cast<SAME_SIZE_UNSIGNED<T>>(v) - static_cast<SAME_SIZE_UNSIGNED<T>>(r.min);
    };

    template<typename T, typename std::enable_if<std::is_floating_point<T>::value>::type * = nullptr>
    auto getRangeValue(const T &v, const RangeSpec<T> &r) {
        using VT = SAME_SIZE_UNSIGNED<T>;
        const VT maxUint = (static_cast<VT>(1) << r.bitsRequired) - 1;
        const auto ratio = (v - r.min) / (r.max - r.min);
        return static_cast<VT>(ratio * maxUint);
    };

/*
 * functions for substitution
 */

    template<typename T, size_t N>
    size_t findSubstitutionIndex(const T &v, const std::array<T, N> &defValues) {
        auto index{1u};
        for (auto &d:defValues) {
            if (d == v)
                return index;
            ++index;
        }
        return 0u;
    };




    template<typename Writter>
    class Serializer {
    public:
        Serializer(Writter &w) : _writter{w} {};

        template<typename T>
        Serializer& object(const T &obj) {
            return serialize(*this, obj);
        }

        /*
         * value overloads
         */

        template<size_t VSIZE = 0, typename T, typename std::enable_if<std::is_floating_point<T>::value>::type * = nullptr>
        Serializer& value(const T &v) {
            static_assert(std::numeric_limits<float>::is_iec559, "");
            static_assert(std::numeric_limits<double>::is_iec559, "");

            constexpr size_t ValueSize = VSIZE == 0 ? sizeof(T) : VSIZE;
            _writter.template writeBytes<ValueSize>(reinterpret_cast<const SAME_SIZE_UNSIGNED<T> &>(v));
            return *this;
        }

        template<size_t VSIZE = 0, typename T, typename std::enable_if<std::is_enum<T>::value>::type * = nullptr>
        Serializer& value(const T &v) {
            constexpr size_t ValueSize = VSIZE == 0 ? sizeof(T) : VSIZE;
            _writter.template writeBytes<ValueSize>(reinterpret_cast<const std::underlying_type_t<T> &>(v));
            return *this;
        }

        template<size_t VSIZE = 0, typename T, typename std::enable_if<std::is_integral<T>::value>::type * = nullptr>
        Serializer& value(const T &v) {
            constexpr size_t ValueSize = VSIZE == 0 ? sizeof(T) : VSIZE;
            _writter.template writeBytes<ValueSize>(v);
            return *this;
        }

        /*
         * range
         */

        template<typename T>
        Serializer& range(const T &v, const RangeSpec<T> &range) {
            assert(isRangeValid(v, range));
            _writter.template writeBits(getRangeValue(v, range), range.bitsRequired);
            return *this;
        }

        /*
         * substitution overloads
         */
        template<typename T, size_t N, typename Fnc>
        Serializer& substitution(const T &v, const std::array<T, N> &expectedValues, Fnc &&fnc) {
            auto index = findSubstitutionIndex(v, expectedValues);
            range(index, {{}, N +1});
            if (!index)
                fnc(v);
            return *this;
        };

        template<size_t VSIZE, typename T, size_t N>
        Serializer& substitution(const T &v, const std::array<T, N> &expectedValues) {
            auto index = findSubstitutionIndex(v, expectedValues);
            range(index, {{}, N +1});
            if (!index)
                ProcessAnyType<VSIZE>::serialize(*this, v);
            return *this;
        };

        template<typename T, size_t N>
        Serializer& substitution(const T &v, const std::array<T, N> &expectedValues) {
            auto index = findSubstitutionIndex(v, expectedValues);
            range(index, {{}, N +1});
            if (!index)
                ProcessAnyType<ARITHMETIC_OR_ENUM_SIZE<T>>::serialize(*this, v);
            return *this;
        };

        /*
         * text overloads
         */

        template<size_t VSIZE = 1, typename T>
        Serializer& text(const std::basic_string<T> &str, size_t maxSize) {
            assert(str.size() <= maxSize);
            procText<VSIZE>(str.data(), str.size());
            return *this;
        }

        template<size_t VSIZE = 1, typename T, size_t N>
        Serializer& text(const T (&str)[N]) {
            procText<VSIZE>(str, std::min(std::char_traits<T>::length(str), N - 1));
            return *this;
        }

        /*
         * container overloads
         */

        template<typename T, typename Fnc>
        Serializer& container(const T &obj, Fnc &&fnc, size_t maxSize) {
            assert(obj.size() <= maxSize);
            writeLength(obj.size());
            for (auto &v: obj)
                fnc(v);
            return *this;
        }

        template<size_t VSIZE, typename T>
        Serializer& container(const T &obj, size_t maxSize) {
            assert(obj.size() <= maxSize);
            writeLength(obj.size());
            procContainer<VSIZE>(obj);
            return *this;
        }

        template<typename T>
        Serializer& container(const T &obj, size_t maxSize) {
            assert(obj.size() <= maxSize);
            writeLength(obj.size());
            procContainer<ARITHMETIC_OR_ENUM_SIZE<typename T::value_type>>(obj);
            return *this;
        }

        /*
         * array overloads (fixed size array (std::array, and c-style array))
         */

        //std::array overloads

        template<typename T, size_t N, typename Fnc>
        Serializer& array(const std::array<T, N> &arr, Fnc &&fnc) {
            for (auto &v: arr)
                fnc(v);
            return *this;
        }

        template<size_t VSIZE, typename T, size_t N>
        Serializer& array(const std::array<T, N> &arr) {
            procContainer<VSIZE>(arr);
            return *this;
        }

        template<typename T, size_t N>
        Serializer& array(const std::array<T, N> &arr) {
            procContainer<ARITHMETIC_OR_ENUM_SIZE<T>>(arr);
            return *this;
        }

        //c-style array overloads

        template<typename T, size_t N, typename Fnc>
        Serializer& array(const T (&arr)[N], Fnc &&fnc) {
            const T *end = arr + N;
            for (const T *tmp = arr; tmp != end; ++tmp)
                fnc(*tmp);
            return *this;
        }

        template<size_t VSIZE, typename T, size_t N>
        Serializer& array(const T (&arr)[N]) {
            procCArray<VSIZE>(arr);
            return *this;
        }

        template<typename T, size_t N>
        Serializer& array(const T (&arr)[N]) {
            procCArray<ARITHMETIC_OR_ENUM_SIZE<T>>(arr);
            return *this;
        }


    private:
        Writter &_writter;

        void writeLength(const size_t size) {
            _writter.writeBits(size, 32);
        }

        template<size_t VSIZE, typename T>
        void procContainer(T &&obj) {
            //todo could be improved for arithmetic types in contiguous containers (std::vector, std::array) (keep in mind std::vector<bool> specialization)
            for (auto &v: obj)
                ProcessAnyType<VSIZE>::serialize(*this, v);
        };

        template<size_t VSIZE, typename T, size_t N>
        void procCArray(T (&arr)[N]) {
            //todo could be improved for arithmetic types
            const T *end = arr + N;
            for (const T *it = arr; it != end; ++it)
                ProcessAnyType<VSIZE>::serialize(*this, *it);
        };

        template<size_t VSIZE, typename T>
        void procText(const T *str, size_t size) {
            writeLength(size);
            if (size)
                _writter.template writeBuffer<VSIZE>(str, size);
        }
    };

}
#endif //TMP_SERIALIZER_H