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gross json preprocessor abuse time

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ouwou 2020-11-01 01:18:54 -05:00
parent 925d7afaf8
commit 18f4f7ce5e
1 changed files with 124 additions and 29 deletions
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153
discord/json.hpp
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@ -1,45 +1,140 @@
#pragma once
#include <nlohmann/json.hpp>
#include <optional>
#define JS_D(k, t) \
do { \
j.at(k).get_to(t); \
namespace detail { // more or less because idk what to name this stuff
template<typename T>
struct is_optional : ::std::false_type {};
template<typename T>
struct is_optional<::std::optional<T>> : ::std::true_type {};
template<typename T>
inline void json_direct(const ::nlohmann::json &j, const char *key, T &val) {
if constexpr (is_optional<T>::value)
val = j.at(key).get<T::value_type>();
else
j.at(key).get_to(val);
}
template<typename T>
inline void json_optional(const ::nlohmann::json &j, const char *key, T &val) {
if constexpr (is_optional<T>::value) {
if (j.contains(key))
val = j.at(key).get<T::value_type>();
else
val = ::std::nullopt;
} else {
if (j.contains(key))
j.at(key).get_to(val);
}
}
template<typename T>
inline void json_nullable(const ::nlohmann::json &j, const char *key, T &val) {
if constexpr (is_optional<T>::value) {
const auto &at = j.at(key);
if (!at.is_null())
val = at.get<T::value_type>();
else
val = std::nullopt;
} else {
const auto &at = j.at(key);
if (!at.is_null())
at.get_to(val);
}
}
template<typename T>
inline void json_optional_nullable(const ::nlohmann::json &j, const char *key, T &val) {
if constexpr (is_optional<T>::value) {
if (j.contains(key)) {
const auto &at = j.at(key);
if (!at.is_null())
val = at.get<T::value_type>();
else
val = std::nullopt;
} else {
val = std::nullopt;
}
} else {
if (j.contains(key)) {
const auto &at = j.at(key);
if (!at.is_null())
at.get_to(val);
}
}
}
template<typename T>
inline void json_update_optional_nullable(const ::nlohmann::json &j, const char *key, T &val) {
if constexpr (is_optional<T>::value) {
if (j.contains(key)) {
const auto &at = j.at(key);
if (!at.is_null())
val = at.get<T::value_type>();
else
val = std::nullopt;
}
} else {
if (j.contains(key)) {
const auto &at = j.at(key);
if (!at.is_null())
at.get_to(val);
else
val = T();
}
}
}
template<typename T, typename U>
inline void json_update_optional_nullable_default(const ::nlohmann::json &j, const char *key, T &val, const U &fallback) {
if constexpr (is_optional<T>::value) {
if (j.contains(key)) {
const auto &at = j.at(key);
if (at.is_null())
val = fallback;
else
val = at.get<T::value_type>();
}
} else {
if (j.contains(key)) {
const auto &at = j.at(key);
if (at.is_null())
val = fallback;
else
at.get_to(val);
}
}
}
} // namespace detail
#define JS_D(k, t) \
do { \
detail::json_direct(j, k, t); \
} while (0)
#define JS_O(k, t) \
do { \
if (j.contains(k)) j.at(k).get_to(t); \
#define JS_O(k, t) \
do { \
detail::json_optional(j, k, t); \
} while (0)
#define JS_N(k, t) \
do { \
if (!j.at(k).is_null()) j.at(k).get_to(t); \
#define JS_N(k, t) \
do { \
detail::json_nullable(j, k, t); \
} while (0)
#define JS_ON(k, t) \
do { \
if (j.contains(k) && !j.at(k).is_null()) \
j.at(k).get_to(t); \
detail::json_optional_nullable(j, k, t); \
} while (0)
#define JS_RD(k, t) \
do { \
if (j.contains(k)) { \
if (j.at(k).is_null()) { \
t = decltype(t)(); \
} else { \
j.at(k).get_to(t); \
} \
} \
#define JS_RD(k, t) \
do { \
detail::json_update_optional_nullable(j, k, t); \
} while (0)
#define JS_RV(k, t, d) \
do { \
if (j.contains(k)) { \
if (j.at(k).is_null()) { \
t = d; \
} else { \
j.at(k).get_to(t); \
} \
} \
#define JS_RV(k, t, d) \
do { \
detail::json_update_optional_nullable_default(j, k, t, d); \
} while (0)