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reflect.hpp
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#pragma once
#include <array>
#include <cstddef>
#include <cstdint>
#include <map>
#include <memory>
#include <optional>
#include <string>
#include <string_view>
#include <type_traits>
#include <unordered_map>
#include <variant>
#include <vector>
namespace reflect {
#if __cpp_constexpr >= 201'703L
# define REFLECT__CONSTEXPR17 constexpr
#else
# define REFLECT__CONSTEXPR17
#endif
#if defined(_MSC_VER) && (!defined(_MSVC_TRADITIONAL) || _MSVC_TRADITIONAL)
# define REFLECT(...) \
__pragma(message("Please turn on /Zc:preprocessor before using " \
"REFLECT!"))
# define REFLECT_GLOBAL(...) \
__pragma(message("Please turn on /Zc:preprocessor before using " \
"REFLECT!"))
# define REFLECT_GLOBAL_TEMPLATED(...) \
__pragma(message("Please turn on /Zc:preprocessor before using " \
"REFLECT!"))
# define REFLECT__PP_VA_OPT_SUPPORT(...) 0
#else
# define REFLECT__PP_CONCAT_(a, b) a##b
# define REFLECT__PP_CONCAT(a, b) REFLECT__PP_CONCAT_(a, b)
# define REFLECT__PP_GET_1(a, ...) a
# define REFLECT__PP_GET_2(a, b, ...) b
# define REFLECT__PP_GET_3(a, b, c, ...) c
# define REFLECT__PP_GET_4(a, b, c, d, ...) d
# define REFLECT__PP_VA_EMPTY_(...) REFLECT__PP_GET_2(__VA_OPT__(, ) 0, 1, )
# define REFLECT__PP_VA_OPT_SUPPORT !REFLECT__PP_VA_EMPTY_
# if REFLECT__PP_VA_OPT_SUPPORT(?)
# define REFLECT__PP_VA_EMPTY(...) REFLECT__PP_VA_EMPTY_(__VA_ARGS__)
# else
# define REFLECT__PP_VA_EMPTY(...) 0
# endif
# define REFLECT__PP_IF(a, t, f) REFLECT__PP_IF_(a, t, f)
# define REFLECT__PP_IF_(a, t, f) REFLECT__PP_IF__(a, t, f)
# define REFLECT__PP_IF__(a, t, f) \
REFLECT__PP_IF___(REFLECT__PP_VA_EMPTY a, t, f)
# define REFLECT__PP_IF___(a, t, f) REFLECT__PP_IF____(a, t, f)
# define REFLECT__PP_IF____(a, t, f) REFLECT__PP_IF_##a(t, f)
# define REFLECT__PP_IF_0(t, f) REFLECT__PP_UNWRAP_BRACE(f)
# define REFLECT__PP_IF_1(t, f) REFLECT__PP_UNWRAP_BRACE(t)
# define REFLECT__PP_NARG(...) \
REFLECT__PP_IF((__VA_ARGS__), (0), \
(REFLECT__PP_NARG_(__VA_ARGS__, 26, 25, 24, 23, 22, 21, \
20, 19, 18, 17, 16, 15, 14, 13, 12, 11, \
10, 9, 8, 7, 6, 5, 4, 3, 2, 1)))
# define REFLECT__PP_NARG_(...) REFLECT__PP_NARG__(__VA_ARGS__)
# define REFLECT__PP_NARG__(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, \
_13, _14, _15, _16, _17, _18, _19, _20, _21, _22, \
_23, _24, _25, _26, N, ...) \
N
# define REFLECT__PP_FOREACH(f, ...) \
REFLECT__PP_FOREACH_(REFLECT__PP_NARG(__VA_ARGS__), f, __VA_ARGS__)
# define REFLECT__PP_FOREACH_(N, f, ...) \
REFLECT__PP_FOREACH__(N, f, __VA_ARGS__)
# define REFLECT__PP_FOREACH__(N, f, ...) \
REFLECT__PP_FOREACH_##N(f, __VA_ARGS__)
# define REFLECT__PP_FOREACH_0(f, ...)
# define REFLECT__PP_FOREACH_1(f, a) f(a)
# define REFLECT__PP_FOREACH_2(f, a, b) f(a) f(b)
# define REFLECT__PP_FOREACH_3(f, a, b, c) f(a) f(b) f(c)
# define REFLECT__PP_FOREACH_4(f, a, b, c, d) f(a) f(b) f(c) f(d)
# define REFLECT__PP_FOREACH_5(f, a, b, c, d, e) f(a) f(b) f(c) f(d) f(e)
# define REFLECT__PP_FOREACH_6(f, a, b, c, d, e, g) \
f(a) f(b) f(c) f(d) f(e) f(g)
# define REFLECT__PP_FOREACH_7(f, a, b, c, d, e, g, h) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h)
# define REFLECT__PP_FOREACH_8(f, a, b, c, d, e, g, h, i) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i)
# define REFLECT__PP_FOREACH_9(f, a, b, c, d, e, g, h, i, j) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j)
# define REFLECT__PP_FOREACH_10(f, a, b, c, d, e, g, h, i, j, k) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k)
# define REFLECT__PP_FOREACH_11(f, a, b, c, d, e, g, h, i, j, k, l) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l)
# define REFLECT__PP_FOREACH_12(f, a, b, c, d, e, g, h, i, j, k, l, m) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m)
# define REFLECT__PP_FOREACH_13(f, a, b, c, d, e, g, h, i, j, k, l, m, n) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n)
# define REFLECT__PP_FOREACH_14(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o)
# define REFLECT__PP_FOREACH_15(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) f(p)
# define REFLECT__PP_FOREACH_16(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p, q) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) \
f(p) f(q)
# define REFLECT__PP_FOREACH_17(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p, q, r) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) \
f(p) f(q) f(r)
# define REFLECT__PP_FOREACH_18(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p, q, r, s) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) \
f(p) f(q) f(r) f(s)
# define REFLECT__PP_FOREACH_19(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p, q, r, s, t) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) \
f(p) f(q) f(r) f(s) f(t)
# define REFLECT__PP_FOREACH_20(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p, q, r, s, t, u) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) \
f(p) f(q) f(r) f(s) f(t) f(u)
# define REFLECT__PP_FOREACH_21(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p, q, r, s, t, u, v) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) \
f(p) f(q) f(r) f(s) f(t) f(u) f(v)
# define REFLECT__PP_FOREACH_22(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p, q, r, s, t, u, v, w) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) \
f(p) f(q) f(r) f(s) f(t) f(u) f(v) f(w)
# define REFLECT__PP_FOREACH_23(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p, q, r, s, t, u, v, w, x) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) \
f(p) f(q) f(r) f(s) f(t) f(u) f(v) f(w) f(x)
# define REFLECT__PP_FOREACH_24(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p, q, r, s, t, u, v, w, x, y) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) \
f(p) f(q) f(r) f(s) f(t) f(u) f(v) f(w) f(x) f(y)
# define REFLECT__PP_FOREACH_25(f, a, b, c, d, e, g, h, i, j, k, l, m, n, o, \
p, q, r, s, t, u, v, w, x, y, z) \
f(a) f(b) f(c) f(d) f(e) f(g) f(h) f(i) f(j) f(k) f(l) f(m) f(n) f(o) \
f(p) f(q) f(r) f(s) f(t) f(u) f(v) f(w) f(x) f(y) f(z)
# define REFLECT__PP_STRINGIFY(...) REFLECT__PP_STRINGIFY(__VA_ARGS__)
# define REFLECT__PP_STRINGIFY_(...) #__VA_ARGS__
# define REFLECT__PP_EXPAND(...) REFLECT__PP_EXPAND_(__VA_ARGS__)
# define REFLECT__PP_EXPAND_(...) __VA_ARGS__
# define REFLECT__PP_UNWRAP_BRACE(...) REFLECT__PP_UNWRAP_BRACE_ __VA_ARGS__
# define REFLECT__PP_UNWRAP_BRACE_(...) __VA_ARGS__
# ifdef DEBUG_REPR
# define REFLECT__EXTRA(...) DEBUG_REPR(__VA_ARGS__)
# define REFLECT_GLOBAL__EXTRA(...) DEBUG_REPR_GLOBAL(__VA_ARGS__)
# define REFLECT_GLOBAL_TEMPLATED__EXTRA(...) \
DEBUG_REPR_GLOBAL_TEMPLATED(__VA_ARGS__)
# else
# define REFLECT__EXTRA(...)
# define REFLECT_GLOBAL__EXTRA(...)
# define REFLECT_GLOBAL_TEMPLATED__EXTRA(...)
# endif
# define REFLECT__ON_EACH(x) reflector.member(#x, x);
# define REFLECT(...) \
template <class ReflectorT> \
REFLECT__CONSTEXPR17 void REFLECT__MEMBERS(ReflectorT &reflector){ \
REFLECT__PP_FOREACH(REFLECT__ON_EACH, \
__VA_ARGS__)} REFLECT__EXTRA(__VA_ARGS__)
# define REFLECT__GLOBAL_ON_EACH(x) \
reflector.member(#x##_REFLECT__static_string, object.x);
# define REFLECT_GLOBAL(T, ...) \
template <class ReflectorT> \
REFLECT__CONSTEXPR17 void REFLECT__MEMBERS(ReflectorT &reflector, \
T &object){ \
REFLECT__PP_FOREACH(REFLECT__GLOBAL_ON_EACH, \
__VA_ARGS__)} REFLECT_GLOBAL__EXTRA(__VA_ARGS__)
# define REFLECT_GLOBAL_TEMPLATED(T, Tmpls, TmplsClassed, ...) \
template <class ReflectorT, REFLECT__PP_UNWRAP_BRACE(TmplsClassed)> \
REFLECT__CONSTEXPR17 void REFLECT__MEMBERS( \
ReflectorT &reflector, \
T<REFLECT__PP_UNWRAP_BRACE(Tmpls)> &object){REFLECT__PP_FOREACH( \
REFLECT__GLOBAL_ON_EACH, \
__VA_ARGS__)} REFLECT_GLOBAL_TEMPLATED__EXTRA(__VA_ARGS__)
#endif
struct JsonValue {
using Ptr = std::unique_ptr<JsonValue>;
using Null = std::monostate;
using String = std::string;
using Dict = std::map<std::string, JsonValue::Ptr>;
using Array = std::vector<JsonValue::Ptr>;
using Integer = std::int64_t;
using Real = double;
using Boolean = bool;
using Union =
std::variant<Null, String, Dict, Array, Integer, Real, Boolean>;
Union inner;
template <class T>
explicit JsonValue(std::in_place_type_t<T>, T &&value)
: inner(std::in_place_type<T>, std::move(value)) {}
template <class T>
static Ptr make(T value) {
return std::make_unique<JsonValue>(std::in_place_type<T>,
std::move(value));
}
};
template <class T>
struct NoDefault {
private:
T value;
public:
NoDefault(T &&value) noexcept(std::is_nothrow_move_constructible_v<T>)
: value(std::move(value)) {}
NoDefault(T const &value) noexcept(std::is_nothrow_copy_constructible_v<T>)
: value(value) {}
template <class U, class = std::enable_if_t<std::is_convertible_v<U, T>>>
NoDefault(U &&value) noexcept(std::is_nothrow_convertible_v<U, T>)
: value(std::forward<U>(value)) {}
template <class = std::enable_if_t<std::is_convertible_v<
std::initializer_list<typename T::value_type>, T>>>
NoDefault(std::initializer_list<typename T::value_type> value) noexcept(
std::is_nothrow_convertible_v<
std::initializer_list<typename T::value_type>, T>)
: value(std::move(value)) {}
NoDefault(NoDefault const &) = default;
NoDefault &operator=(NoDefault const &) = default;
NoDefault(NoDefault &&) = default;
NoDefault &operator=(NoDefault &&) = default;
T &operator*() noexcept {
return value;
}
T const &operator*() const noexcept {
return value;
}
T *operator->() noexcept {
return std::addressof(value);
}
T const *operator->() const noexcept {
return std::addressof(value);
}
using value_type = T;
};
struct JsonEncoder;
template <class T, class = void>
struct JsonTrait {
static void putValue(JsonEncoder *encoder, T const &value) {
static_assert(!std::is_same_v<T, T>,
"the given type contains members that are not reflected, "
"please add REFLECT macro to it");
}
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
static_assert(!std::is_same_v<T, T>,
"the given type contains members that are not reflected, "
"please add REFLECT macro to it");
return false;
}
};
struct JsonEncoder {
std::string json;
void put(char c) {
json.push_back(c);
}
void put(char const *s, std::size_t len) {
json.append(s, len);
}
void putLiterialString(char const *name) {
put('"');
json.append(name);
put('"');
}
void putString(char const *name, std::size_t len) {
put('"');
for (char const *it = name, *ep = name + len; it != ep; ++it) {
char c = *it;
switch (c) {
case '\n': put("\\n", 2); break;
case '\r': put("\\r", 2); break;
case '\t': put("\\t", 2); break;
case '\\': put("\\\\", 2); break;
case '\0': put("\\0", 2); break;
case '"': put("\\\"", 2); break;
default:
if ((c >= 0 && c < 0x20) || c == 0x7F) {
put("\\u00", 4);
auto u = static_cast<unsigned char>(c);
put("0123456789abcdef"[u >> 4]);
put("0123456789abcdef"[u & 0x0F]);
} else {
put(c);
}
break;
}
}
put('"');
}
template <class T>
void putArithmetic(T const &value) {
json.append(std::to_string(value));
}
template <class T>
void putValue(T const &value) {
JsonTrait<T>::putValue(this, value);
}
};
enum class JsonError : int {
Success = 0,
TypeMismatch,
UnexpectedEnd,
UnexpectedToken,
NonTerminatedString,
InvalidUTF16String,
DictKeyNotString,
InvalidNumberFormat,
NotImplemented,
};
inline std::error_category const &jsonCategory() {
static struct : std::error_category {
virtual char const *name() const noexcept {
return "reflect::json";
}
virtual std::string message(int e) const {
using namespace std::string_literals;
switch (static_cast<JsonError>(e)) {
case JsonError::Success: return "success"s;
case JsonError::TypeMismatch: return "type mismatch"s;
case JsonError::UnexpectedEnd: return "unexpected end"s;
case JsonError::UnexpectedToken: return "unexpected token"s;
case JsonError::NonTerminatedString:
return "non-terminated string"s;
case JsonError::InvalidUTF16String: return "invalid utf-16 string"s;
case JsonError::DictKeyNotString: return "dict key must be string"s;
case JsonError::InvalidNumberFormat:
return "invalid number format"s;
case JsonError::NotImplemented: return "not implemented"s;
default: return "unknown error"s;
}
}
} instance;
return instance;
}
inline std::error_code make_error_code(JsonError e) {
return std::error_code(static_cast<int>(e), jsonCategory());
}
inline JsonValue::Ptr jsonParse(std::string_view &json, std::error_code &ec) {
using namespace std::string_view_literals;
JsonValue::Ptr current;
auto nonempty = json.find_first_not_of(" \t\n\r\0"sv);
if (nonempty == json.npos) {
ec = make_error_code(JsonError::UnexpectedEnd);
return nullptr;
}
json.remove_prefix(nonempty);
char c = json.front();
if (c == '"') {
json.remove_prefix(1);
std::string str;
unsigned int phase = 0;
unsigned int lasthex = 0;
unsigned int hex = 0;
std::size_t i;
for (i = 0;; ++i) {
if (i == json.size()) {
ec = make_error_code(JsonError::NonTerminatedString);
return nullptr;
}
char c = json[i];
if (phase == 0) {
if (c == '"') {
break;
} else if (c == '\\') {
phase = 1;
continue;
}
} else if (phase == 1) {
if (c == 'u') {
phase = 2;
hex = 0;
lasthex = false;
continue;
} else if (c == 'n') {
c = '\n';
} else if (c == 't') {
c = '\t';
} else if (c == '\\') {
c = '\\';
} else if (c == '0') {
c = '\0';
} else if (c == 'r') {
c = '\r';
} else if (c == 'v') {
c = '\v';
} else if (c == 'f') {
c = '\f';
} else if (c == 'b') {
c = '\b';
} else if (c == 'a') {
c = '\a';
}
phase = 0;
} else {
hex <<= 4;
if ('0' <= c && c <= '9') {
hex |= (unsigned int)(c - '0');
} else if ('a' <= c && c <= 'f') {
hex |= (unsigned int)(c - 'a' + 10);
} else if ('A' <= c && c <= 'F') {
hex |= (unsigned int)(c - 'A' + 10);
}
if (phase == 5) {
if (0xD800 <= hex && hex < 0xDC00) {
if (!lasthex) {
phase = 2;
lasthex = hex;
hex = 0;
continue;
} else {
ec = make_error_code(JsonError::InvalidUTF16String);
return nullptr;
}
} else if (0xDC00 <= hex && hex < 0xE000) {
if (lasthex) {
hex = 0x10000 + (lasthex - 0xD800) * 0x400 +
(hex - 0xDC00);
lasthex = false;
phase = 0;
} else {
ec = make_error_code(JsonError::InvalidUTF16String);
return nullptr;
}
}
if (hex <= 0x7F) {
str.push_back((char)(unsigned char)(hex));
} else if (hex <= 0x7FF) {
str.push_back((char)(unsigned char)(0xC0 | (hex >> 6)));
str.push_back(
(char)(unsigned char)(0x80 | (hex & 0x3F)));
} else if (hex <= 0xFFFF) {
str.push_back(
(char)(unsigned char)(0xE0 | (hex >> 12)));
str.push_back(
(char)(unsigned char)(0x80 | ((hex >> 6) & 0x3F)));
str.push_back(
(char)(unsigned char)(0x80 | (hex & 0x3F)));
} else if (hex <= 0x10FFFF) {
str.push_back(
(char)(unsigned char)(0xF0 | (hex >> 18)));
str.push_back(
(char)(unsigned char)(0x80 | ((hex >> 12) & 0x3F)));
str.push_back(
(char)(unsigned char)(0x80 | ((hex >> 6) & 0x3F)));
str.push_back(
(char)(unsigned char)(0x80 | (hex & 0x3F)));
} else {
ec = make_error_code(JsonError::InvalidUTF16String);
return nullptr;
}
phase = 0;
} else {
++phase;
}
continue;
}
str.push_back(c);
}
json.remove_prefix(i + 1);
current = JsonValue::make<JsonValue::String>(std::move(str));
} else if (c == '{') {
json.remove_prefix(1);
std::map<std::string, JsonValue::Ptr> dict;
for (;;) {
nonempty = json.find_first_not_of(" \t\n\r\0"sv);
if (nonempty == json.npos) {
ec = make_error_code(JsonError::UnexpectedEnd);
return nullptr;
}
json.remove_prefix(nonempty);
if (json.front() == '}') {
json.remove_prefix(1);
break;
} else if (json.front() == ',') {
json.remove_prefix(1);
continue;
} else {
auto key = jsonParse(json, ec);
if (!key) {
return nullptr;
}
std::string keyString;
if (auto p = std::get_if<JsonValue::String>(&key->inner)) {
keyString = std::move(*p);
} else {
ec = make_error_code(JsonError::DictKeyNotString);
return nullptr;
}
auto nonempty = json.find_first_not_of(" \t\n\r\0"sv);
if (nonempty == json.npos) {
ec = make_error_code(JsonError::UnexpectedEnd);
return nullptr;
}
json.remove_prefix(nonempty);
if (json.front() != ':') {
ec = make_error_code(JsonError::UnexpectedToken);
return nullptr;
}
json.remove_prefix(1);
auto value = jsonParse(json, ec);
if (!value) {
return nullptr;
}
dict.emplace(std::move(keyString), std::move(value));
}
}
current = JsonValue::make<JsonValue::Dict>(std::move(dict));
} else if (c == '[') {
json.remove_prefix(1);
std::vector<JsonValue::Ptr> array;
for (;;) {
auto nonempty = json.find_first_not_of(" \t\n\r\0"sv);
if (nonempty == json.npos) {
ec = make_error_code(JsonError::UnexpectedEnd);
return nullptr;
}
json.remove_prefix(nonempty);
if (json.front() == ']') {
json.remove_prefix(1);
break;
} else if (json.front() == ',') {
json.remove_prefix(1);
continue;
} else {
auto value = jsonParse(json, ec);
if (!value) {
return nullptr;
}
array.emplace_back(std::move(value));
}
}
current = JsonValue::make<JsonValue::Array>(std::move(array));
} else if (('0' <= c && c <= '9') || c == '.' || c == '-' || c == '+') {
auto end = json.find_first_of(",]}"sv);
if (end == json.npos) {
end = json.size();
}
auto str = std::string(json.data(), end);
if (str.find('.') != str.npos) {
double value;
try {
value = std::stod(str);
} catch (std::exception const &) {
ec = make_error_code(JsonError::InvalidNumberFormat);
return nullptr;
}
current = JsonValue::make<JsonValue::Real>(value);
} else {
std::int64_t value;
try {
value = std::stoll(str);
} catch (std::exception const &) {
ec = make_error_code(JsonError::InvalidNumberFormat);
return nullptr;
}
current = JsonValue::make<JsonValue::Integer>(value);
}
json.remove_prefix(end);
} else if (c == 't') {
if (!json.starts_with("true"sv)) {
ec = make_error_code(JsonError::UnexpectedToken);
return nullptr;
}
current = JsonValue::make<JsonValue::Boolean>(true);
json.remove_prefix(4);
} else if (c == 'f') {
if (!json.starts_with("false"sv)) {
ec = make_error_code(JsonError::UnexpectedToken);
return nullptr;
}
current = JsonValue::make<JsonValue::Boolean>(false);
json.remove_prefix(5);
} else if (c == 'n') {
if (!json.starts_with("null"sv)) {
ec = make_error_code(JsonError::UnexpectedToken);
return nullptr;
}
current = JsonValue::make<JsonValue::Null>(JsonValue::Null());
json.remove_prefix(4);
} else {
ec = make_error_code(JsonError::UnexpectedToken);
return nullptr;
}
return current;
}
struct ReflectorJsonEncode {
JsonEncoder *encoder;
bool comma = false;
template <class T>
void member(char const *name, T &value) {
if (!comma) {
comma = true;
} else {
encoder->put(',');
}
encoder->putLiterialString(name);
encoder->put(':');
encoder->putValue(value);
}
};
struct ReflectorJsonDecode {
JsonValue::Dict *currentDict;
std::error_code ec{};
bool failed = false;
template <class T>
void member(char const *name, T &value) {
if (failed) {
return;
}
auto it = currentDict->find(name);
if (it == currentDict->end()) {
JsonValue::Union nullData;
failed = !JsonTrait<T>::getValue(nullData, value, ec);
} else {
failed = !JsonTrait<T>::getValue(it->second->inner, value, ec);
}
}
static void typeMismatch(char const *expect, JsonValue::Union const &inner,
std::error_code &ec) {
char const *got = "???";
std::visit(
[&](auto &&arg) {
using T = std::decay_t<decltype(arg)>;
if constexpr (std::is_same_v<T, JsonValue::Null>) {
got = "null";
} else if constexpr (std::is_same_v<T, JsonValue::String>) {
got = "string";
} else if constexpr (std::is_same_v<T, JsonValue::Dict>) {
got = "dict";
} else if constexpr (std::is_same_v<T, JsonValue::Array>) {
got = "array";
} else if constexpr (std::is_same_v<T, JsonValue::Integer>) {
got = "integer";
} else if constexpr (std::is_same_v<T, JsonValue::Real>) {
got = "real";
} else if constexpr (std::is_same_v<T, JsonValue::Boolean>) {
got = "boolean";
}
},
inner);
#if DEBUG_LEVEL
std::cerr << std::string(
"reflect::json_decode type mismatch (expect ") +
expect + ", got " + got + ")\n";
#endif
ec = make_error_code(JsonError::TypeMismatch);
}
};
struct JsonTraitArrayLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
auto bit = value.begin();
auto eit = value.end();
encoder->put('[');
bool comma = false;
for (auto it = bit; it != eit; ++it) {
if (!comma) {
comma = true;
} else {
encoder->put(',');
}
JsonTrait<typename T::value_type>::putValue(encoder, *it);
}
encoder->put(']');
}
template <class T>
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
if (auto p = std::get_if<JsonValue::Array>(&data)) {
auto bit = p->begin();
auto eit = p->end();
for (auto it = bit; it != eit; ++it) {
auto &element = value.emplace_back();
if (!JsonTrait<typename T::value_type>::getValue((*it)->inner,
element, ec)) {
return false;
}
}
return true;
} else {
ReflectorJsonDecode::typeMismatch("array", data, ec);
return false;
}
}
};
struct JsonTraitDictLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
auto bit = value.begin();
auto eit = value.end();
encoder->put('{');
bool comma = false;
for (auto it = bit; it != eit; ++it) {
if (!comma) {
comma = true;
} else {
encoder->put(',');
}
encoder->putString(it->first);
encoder->put(':');
JsonTrait<typename T::mapped_type>::putValue(encoder, it->second);
}
encoder->put('}');
}
template <class T>
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
if (auto p = std::get_if<JsonValue::Dict>(&data)) {
auto bit = p->begin();
auto eit = p->end();
for (auto it = bit; it != eit; ++it) {
auto &element = value.try_emplace(it->first).first->second;
if (!JsonTrait<typename T::mapped_type>::getValue(
it->second->inner, element, ec)) {
return false;
}
}
return true;
} else {
ReflectorJsonDecode::typeMismatch("dict", data, ec);
return false;
}
}
};
struct JsonTraitStringLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
encoder->putString(value.data(), value.size());
}
template <class T>
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
if (auto p = std::get_if<JsonValue::String>(&data)) {
value = std::move(*p);
return true;
} else {
ReflectorJsonDecode::typeMismatch("string", data, ec);
return false;
}
}
};
struct JsonTraitNullLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
encoder->put("null", 4);
}
template <class T>
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
if (std::get_if<JsonValue::Null>(&data)) {
return true;
} else {
ReflectorJsonDecode::typeMismatch("null", data, ec);
return false;
}
}
};
struct JsonTraitOptionalLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
if (value) {
encoder->putValue(*value);
} else {
encoder->put("null", 4);
}
}
template <class T>
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
if (std::get_if<JsonValue::Null>(&data)) {
value = std::nullopt;
return true;
} else {
return JsonTrait<typename T::value_type>::getValue(
data, value.emplace(), ec);
}
}
};
struct JsonTraitBooleanLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
if (value) {
encoder->put("true", 4);
} else {
encoder->put("false", 5);
}
}
template <class T>
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
if (auto p = std::get_if<JsonValue::Boolean>(&data)) {
value = *p;
return true;
} else {
ReflectorJsonDecode::typeMismatch("boolean", data, ec);
return false;
}
}
};
struct JsonTraitArithmeticLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
encoder->putArithmetic(value);
}
template <class T>
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
if (auto p = std::get_if<JsonValue::Integer>(&data)) {
value = *p;
return true;
} else if (auto p = std::get_if<JsonValue::Real>(&data)) {
value = *p;
return true;
} else {
ReflectorJsonDecode::typeMismatch("integer or real", data, ec);
return false;
}
}
};
struct JsonTraitVariantLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
std::visit([&](auto const &arg) { encoder->putValue(arg); }, value);
}
template <class T>
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
ec = make_error_code(JsonError::NotImplemented);
return false;
throw "TODO!! IMPLEMENT THIS!!";
/* std::visit([&](auto const &arg) { */
/* using Arg = std::decay_t<decltype(arg)>; */
/* encoder->getValue(data, arg, ec); */
/* }, data.inner); */
}
};
struct JsonTraitJsonValueLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
encoder->putValue(value.inner);
}
template <class T>
static bool getValue(JsonValue::Union &data, JsonValue &value,
std::error_code &ec) {
value.inner = std::move(data);
return true;
}
};
struct JsonTraitObjectLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
ReflectorJsonEncode reflector(encoder);
encoder->put('{');
reflect_members(reflector, const_cast<T &>(value));
encoder->put('}');
}
template <class T>
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
if (auto p = std::get_if<JsonValue::Dict>(&data)) {
ReflectorJsonDecode reflector(p);
reflect_members(reflector, value);
if (reflector.failed) {
ec = reflector.ec;
return false;
}
return true;
} else {
ReflectorJsonDecode::typeMismatch("object", data, ec);
return false;
}
}
};
struct JsonTraitWrapperLike {
template <class T>
static void putValue(JsonEncoder *encoder, T const &value) {
return JsonTrait<typename T::value_type>::putValue(encoder, *value);
}
template <class T>
static bool getValue(JsonValue::Union &data, T &value,
std::error_code &ec) {
return JsonTrait<typename T::value_type>::getValue(data, *value, ec);
}
};
template <class T, std::size_t N>
struct JsonTrait<std::array<T, N>> : JsonTraitArrayLike {};
template <class T, class Alloc>
struct JsonTrait<std::vector<T, Alloc>> : JsonTraitArrayLike {};
template <class K, class V, class Cmp, class Alloc>
struct JsonTrait<std::map<K, V, Cmp, Alloc>> : JsonTraitDictLike {};
template <class K, class V, class Hash, class Eq, class Alloc>
struct JsonTrait<std::unordered_map<K, V, Hash, Eq, Alloc>>
: JsonTraitDictLike {};
template <class Traits, class Alloc>
struct JsonTrait<std::basic_string<char, Traits, Alloc>> : JsonTraitStringLike {
};
template <class Traits>
struct JsonTrait<std::basic_string_view<char, Traits>> : JsonTraitStringLike {};
template <class... Ts>
struct JsonTrait<std::variant<Ts...>> : JsonTraitVariantLike {};
template <class T>
struct JsonTrait<std::optional<T>> : JsonTraitOptionalLike {};
template <>
struct JsonTrait<std::nullptr_t> : JsonTraitNullLike {};
template <>
struct JsonTrait<std::nullopt_t> : JsonTraitNullLike {};
template <>
struct JsonTrait<std::monostate> : JsonTraitNullLike {};
template <>
struct JsonTrait<bool> : JsonTraitBooleanLike {};
template <class T>
struct JsonTrait<NoDefault<T>> : JsonTraitWrapperLike {};
template <class T>
struct JsonTrait<T, std::enable_if_t<std::is_arithmetic_v<T>>>
: JsonTraitArithmeticLike {};
template <class Reflector, class T>
inline std::void_t<
decltype(std::declval<T &>().REFLECT__MEMBERS(std::declval<Reflector &>()))>
reflect_members(Reflector &reflector, T &value) {
value.REFLECT__MEMBERS(reflector);
}
template <class Reflector, class T,
class = std::void_t<decltype(REFLECT__MEMBERS(
std::declval<T &>(), std::declval<Reflector &>()))>>
inline void reflect_members(Reflector &reflector, T &value) {
value.REFLECT__MEMBERS(value, reflector);
}
template <class T>
struct JsonTrait<T, JsonValue> : JsonTraitJsonValueLike {};
template <class T>
struct JsonTrait<