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types.hpp
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types.hpp
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#pragma once
#include <string>
#include <variant>
#include <nlohmann/json.hpp>
#include <immer/array.hpp>
#include <immer/map.hpp>
#include <boost/hana/type.hpp>
#include <lager/util.hpp>
#include "descendent.hpp"
namespace Kazv
{
using json = nlohmann::json;
using Bytes = std::string;
enum Status : bool
{
FAIL,
SUCC,
};
class JsonWrap
{
// Cannot use box here, because it causes the resulting json
// to be wrapped into an array.
// https://github.com/arximboldi/immer/issues/155
immer::array<json> m_d;
public:
JsonWrap() = default;
JsonWrap(json&& j) : m_d(1, std::move(j)) {}
JsonWrap(const json& j) : m_d(1, j) {}
const json &get() const { return m_d.at(0); }
operator json() const { return m_d.at(0); }
};
namespace detail
{
auto hasEmptyMethod = boost::hana::is_valid(
[](auto &&x) -> decltype((void)x.empty()) {});
template<class U>
struct AddToJsonIfNeededT
{
template<class T>
static void call(json &j, std::string name, T &&arg) {
if constexpr (detail::hasEmptyMethod(arg)) {
if (! arg.empty()) {
j[name] = std::forward<T>(arg);
}
} else {
j[name] = std::forward<T>(arg);
}
}
};
template<class U>
struct AddToJsonIfNeededT<std::optional<U>>
{
template<class T>
static void call(json &j, std::string name, T &&arg) {
if (arg.has_value()) {
j[name] = std::forward<T>(arg).value();
}
}
};
}
template<class T>
inline void addToJsonIfNeeded(json &j, std::string name, T &&arg)
{
detail::AddToJsonIfNeededT<std::decay_t<T>>::call(j, name, std::forward<T>(arg));
};
// Provide a non-destructive way to add the map
// to json.
template<class MapT,
// disallow json object here
std::enable_if_t<!std::is_same_v<std::decay_t<MapT>, json>
&& !std::is_same_v<std::decay_t<MapT>, JsonWrap>, int> = 0>
inline void addPropertyMapToJson(json &j, MapT &&arg)
{
for (auto kv : std::forward<MapT>(arg)) {
auto [k, v] = kv;
j[k] = v;
}
};
inline void addPropertyMapToJson(json &j, const json &arg)
{
for (auto kv : arg.items()) {
auto [k, v] = kv;
j[k] = v;
}
};
using EventList = immer::array<JsonWrap>;
using namespace std::string_literals;
struct Null {};
using Variant = std::variant<std::string, JsonWrap, Null>;
}
namespace nlohmann {
template <class T, class V>
struct adl_serializer<immer::map<T, V>> {
static void to_json(json& j, immer::map<T, V> map) {
for (auto [k, v] : map) {
j[k] = v;
}
}
static void from_json(const json& j, immer::map<T, V> &m) {
immer::map<T, V> ret;
if (j.is_object()) {
for (const auto &[k, v] : j.items()) {
ret = std::move(ret).set(k, v);
}
}
m = ret;
}
};
template <class T>
struct adl_serializer<immer::array<T>> {
static void to_json(json& j, immer::array<T> arr) {
for (auto i : arr) {
j.push_back(i);
}
}
static void from_json(const json& j, immer::array<T> &a) {
immer::array<T> ret;
if (j.is_object()) {
for (const auto &i : j) {
ret = std::move(ret).push_back(i);
}
}
a = ret;
}
};
template <>
struct adl_serializer<Kazv::JsonWrap> {
static void to_json(json& j, Kazv::JsonWrap w) {
j = w.get();
}
static void from_json(const json& j, Kazv::JsonWrap &w) {
w = Kazv::JsonWrap(j);
}
};
template <>
struct adl_serializer<Kazv::Variant> {
static void to_json(json& j, const Kazv::Variant &var) {
std::visit(lager::visitor{
[&j](std::string i) { j = i; },
[&j](Kazv::JsonWrap i) { j = i; },
[&j](Kazv::Null) { j = nullptr; }
}, var);
}
static void from_json(const json& j, Kazv::Variant &var) {
if (j.is_string()) {
var = j.get<std::string>();
} else if (j.is_null()) {
var = Kazv::Null{};
} else { // is object
var = Kazv::Variant(Kazv::JsonWrap(j));
}
}
};
}

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