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#pragma once
#include <cstdio>
#include <string>
#include <utility>
#include <fstream>
#include <exception>
#include <nlohmann/json.hpp>
#include <Corrade/Utility/Debug.h>
#include <Corrade/Utility/DebugStl.h>
#include <Magnum/Magnum.h>
#include <Magnum/Math/Vector2.h>
namespace nlohmann {
template<>
struct adl_serializer<Magnum::Vector2i> final {
static void to_json(json& j, const Magnum::Vector2i& x);
static void from_json(const json& j, Magnum::Vector2i& x);
};
void adl_serializer<Magnum::Vector2i>::to_json(json& j, const Magnum::Vector2i& val)
{
char buf[64];
snprintf(buf, sizeof(buf), "%d x %d", val[0], val[1]);
j = buf;
}
void adl_serializer<Magnum::Vector2i>::from_json(const json& j, Magnum::Vector2i& val)
{
std::string str = j;
int x = 0, y = 0, n = 0;
int ret = std::sscanf(str.c_str(), "%d x %d%n", &x, &y, &n);
if (ret != 2 || (std::size_t)n != str.size())
{
std::string msg; msg.reserve(64 + str.size());
msg += "failed to parse string '";
msg += str;
msg += "' as Magnum::Vector2i";
throw std::invalid_argument(msg);
}
val = { x, y };
}
} // namespace nlohmann
template<typename t>
struct json_helper final {
[[nodiscard]] static std::tuple<t, bool> from_json(const std::filesystem::path& pathname) noexcept;
[[nodiscard]] static bool to_json(const t& self, const std::filesystem::path& pathname) noexcept;
};
template<typename t>
std::tuple<t, bool> json_helper<t>::from_json(const std::filesystem::path& pathname) noexcept {
using namespace nlohmann;
using Corrade::Utility::Error;
std::ifstream s;
s.exceptions(s.exceptions() | std::ios::failbit | std::ios::badbit);
try {
s.open(pathname, std::ios_base::in);
} catch (const std::ios::failure& e) {
Error{Error::Flag::NoSpace} << "failed to open " << pathname << ": " << e.what();
return { {}, false };
}
t ret;
try {
json j;
s >> j;
using nlohmann::from_json;
from_json(j, ret);
} catch (const std::exception& e) {
Error{Error::Flag::NoSpace} << "failed to parse " << pathname << ": " << e.what();
return { {}, false };
}
return { std::move(ret), true };
}
template<typename t>
bool json_helper<t>::to_json(const t& self, const std::filesystem::path& pathname) noexcept {
using Corrade::Utility::Error;
try {
nlohmann::json j = self;
std::ofstream s;
s.exceptions(s.exceptions() | std::ios::failbit | std::ios::badbit);
try {
s.open(pathname, std::ios_base::out | std::ios_base::trunc);
} catch (const std::ios::failure& e) {
Error{} << "failed to open" << pathname << "for writing:" << e.what();
return false;
}
s << j.dump(4);
s.flush();
} catch (const std::exception& e) {
Error{Error::Flag::NoSpace} << "failed writing to " << pathname << ": " << e.what();
return false;
}
return true;
}
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