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#pragma once
#include <charconv>
namespace saw {
namespace impl {
template<typename Schema, typename RootSchema, typename FromEncode>
class json_encode {
static_assert(always_false<Schema, RootSchema, FromEncode>, "This schema type is not being handle by the json encoding.");
};
template<typename T, size_t N, typename RootSchema, typename FromEncode>
struct json_encode<schema::Primitive<T,N>, RootSchema, FromEncode> {
static error_or<void> encode(const data<schema::Primitive<T,N>, FromEncode>& from, buffer& to) {
auto val = from.get();
std::array<uint8_t, 256> data;
auto tc_result = std::to_chars(reinterpret_cast<char*>(data.data()), reinterpret_cast<char*>(data.data())+data.size(), val);
if(tc_result.ec != std::errc{}){
return make_error<err::critical>();
}
size_t bytes_written = 0;
for(char* ptr = reinterpret_cast<char*>(data.data()); ptr != tc_result.ptr; ++ptr){
++bytes_written;
}
auto& buff = to;
error err = buff.write_require_length(bytes_written);
if(!err.template is_type<err::no_error>()){
return std::move(err);
}
for(char* ptr = reinterpret_cast<char*>(data.data()); ptr != tc_result.ptr; ++ptr){
uint8_t* un_ptr = reinterpret_cast<uint8_t*>(ptr);
buff.push(un_ptr[0]);
}
return void_t{};
}
};
template<typename RootSchema, typename FromEncode>
struct json_encode<schema::String, RootSchema, FromEncode> {
static error_or<void> encode(const data<schema::String, FromEncode>& from, buffer& to) {
{
auto err = to.push('"');
if(!err.template is_type<err::no_error>()){
return err;
}
}
for(std::size_t i = 0; i < from.size(); ++i){
auto err = to.push(from.get_at(i));
if(!err.template is_type<err::no_error>()){
return err;
}
}
{
auto err = to.push('"');
if(!err.template is_type<err::no_error>()){
return err;
}
}
return void_t{};
}
};
template<typename... T, typename RootSchema, typename FromEncode>
struct json_encode<schema::Tuple<T...>, RootSchema, FromEncode> {
template<size_t i>
static error_or<void> encode_element(const data<schema::Tuple<T...>, FromEncode>& from, buffer& to){
auto eov = json_encode<typename parameter_pack_type<i, T...>::type, RootSchema, FromEncode>::encode(from.template get<i>(), to);
if(eov.is_error()){
return eov;
}
if constexpr ( (i+1) < sizeof...(T)){
{
auto eov_ele = to.push(',');
if(!eov_ele.template is_type<err::no_error>()){
return eov_ele;
}
}
{
auto eov_ele = encode_element<i+1>(from, to);
if(eov_ele.is_error()){
return eov_ele;
}
}
}
return void_t{};
}
static error_or<void> encode(const data<schema::Tuple<T...>, FromEncode>& from, buffer& to) {
{
auto err = to.push('[');
if(!err.template is_type<err::no_error>()){
return err;
}
}
if constexpr ( sizeof...(T) > 0 ){
auto eov = encode_element<0>(from, to);
if(eov.is_error()){
return eov;
}
}
{
auto err = to.push(']');
if(!err.template is_type<err::no_error>()){
return err;
}
}
return void_t{};
}
};
template<typename T, size_t D, typename RootSchema, typename FromEncode>
struct json_encode<schema::Array<T,D>, RootSchema, FromEncode> {
template<size_t Level>
static error_or<void> encode_level(const data<schema::Array<T,D>, FromEncode>& from, buffer& to, std::array<std::size_t, D>& index){
if constexpr (Level == D){
auto eov = json_encode<T, RootSchema, FromEncode>::encode(from.at(index), to);
if(eov.is_error()){
return eov;
}
} else {
{
auto err = to.push('[');
if(!err.template is_type<err::no_error>()){
return err;
}
}
for(std::size_t i = 0; i < from.get_dim_size(Level); ++i){
if( i > 0 ){
auto err = to.push(',');
if(!err.template is_type<err::no_error>()){
return err;
}
}
{
index[Level] = i;
auto eov = encode_level<Level+1>(from, to, index);
if(eov.is_error()){
return eov;
}
}
}
{
auto err = to.push(']');
if(!err.template is_type<err::no_error>()){
return err;
}
}
}
return void_t{};
}
static error_or<void> encode(const data<schema::Array<T,D>, FromEncode>& from, buffer& to) {
std::array<std::size_t, D> index;
return encode_level<0>(from, to, index);
}
};
template<typename... T, string_literal... Key, typename RootSchema, typename FromEncode>
struct json_encode<schema::Struct<schema::Member<T,Key>...>, RootSchema, FromEncode> {
template<size_t i>
static error_or<void> encode_element(const data<schema::Struct<schema::Member<T,Key>...>, FromEncode>& from, buffer& to){
// Encode the name
{
std::string_view view = parameter_key_pack_type<i, Key...>::literal.view();
error err = to.push('"');
if(!err.template is_type<err::no_error>()){
return err;
}
err = to.push(*reinterpret_cast<const uint8_t *>(view.data()), view.size());
if(!err.template is_type<err::no_error>()){
return err;
}
err = to.push('"');
if(!err.template is_type<err::no_error>()){
return err;
}
}
// Add the separator
{
auto eov_ele = to.push(':');
if(!eov_ele.template is_type<err::no_error>()){
return eov_ele;
}
}
// Encode the value
auto eov = json_encode<typename parameter_pack_type<i, T...>::type, RootSchema, FromEncode>::encode(from.template get<parameter_key_pack_type<i, Key...>::literal>(), to);
// Go to the next element
if constexpr ( (i+1) < sizeof...(T)){
{
auto eov_ele = to.push(',');
if(!eov_ele.template is_type<err::no_error>()){
return eov_ele;
}
}
{
auto eov_ele = encode_element<i+1>(from, to);
if(eov_ele.is_error()){
return eov_ele;
}
}
}
return void_t{};
}
static error_or<void> encode(const data<schema::Struct<schema::Member<T,Key>...>, FromEncode>& from, buffer& to) {
{
auto err = to.push('{');
if(!err.template is_type<err::no_error>()){
return err;
}
}
if constexpr ( sizeof...(T) > 0 ){
auto eov = encode_element<0>(from, to);
if(eov.is_error()){
return eov;
}
}
{
auto err = to.push('}');
if(!err.template is_type<err::no_error>()){
return err;
}
}
return void_t{};
}
};
template<typename... T, string_literal... Key, typename RootSchema, typename FromEncode>
struct json_encode<schema::Union<schema::Member<T,Key>...>, RootSchema, FromEncode> {
template<size_t i>
static error_or<void> encode_element(const data<schema::Union<schema::Member<T,Key>...>, FromEncode>& from, buffer& to){
if(from.template holds_alternative<typename parameter_key_pack_type<i, Key...>::literal>()){
// Encode the name
{
std::string_view view = parameter_key_pack_type<i, Key...>::literal.view();
error err = to.push('"');
if(!err.template is_type<err::no_error>()){
return err;
}
err = to.push(*reinterpret_cast<const uint8_t *>(view.data()), view.size());
if(!err.template is_type<err::no_error>()){
return err;
}
err = to.push('"');
if(!err.template is_type<err::no_error>()){
return err;
}
}
// Add the separator
{
auto eov_ele = to.push(':');
if(!eov_ele.template is_type<err::no_error>()){
return eov_ele;
}
}
// Encode the value
auto eov = json_encode<typename parameter_pack_type<i, T...>::type, RootSchema, FromEncode>::encode(from.template get<parameter_key_pack_type<i, Key...>::literal>(), to);
}
// Go to the next element
if constexpr ( (i+1) < sizeof...(T)){
{
auto eov_ele = encode_element<i+1>(from, to);
if(eov_ele.is_error()){
return eov_ele;
}
}
}
return void_t{};
}
static error_or<void> encode(const data<schema::Union<schema::Member<T,Key>...>, FromEncode>& from, buffer& to) {
{
auto err = to.push('{');
if(!err.template is_type<err::no_error>()){
return err;
}
}
if constexpr ( sizeof...(T) > 0 ){
auto eov = encode_element<0>(from, to);
if(eov.is_error()){
return eov;
}
}
{
auto err = to.push('}');
if(!err.template is_type<err::no_error>()){
return err;
}
}
return void_t{};
}
};
template<typename Schema, typename RootSchema, typename ToDecode>
struct json_decode;
template<typename T, size_t N, typename RootSchema, typename ToDecode>
struct json_decode<schema::Primitive<T,N>, RootSchema, ToDecode> {
static error_or<void> decode(buffer_view& buff, data<schema::Primitive<T,N>, ToDecode>& to){
assert((buff.read() >= '0' && buff.read() <= '9') ||
buff.read() == '+' || buff.read() == '-');
std::size_t offset = 0;
if(buff.read() == '-'){
++offset;
}else if(buff.read() == '+'){
return make_error<err::not_supported>();
}
if (offset >= buff.read_composite_length()) {
return make_error<err::buffer_exhausted>();
}
if(buff.read(offset) >= '1' && buff.read(offset) <= '9'){
++offset;
if(offset >= buff.read_composite_length()){
return make_error<err::buffer_exhausted>();
}
while(1){
if (buff.read(offset) >= '0' && buff.read(offset) <= '9'){
++offset;
if(offset >= buff.read_composite_length()){
break;
}
continue;
}
break;
}
}else if (buff.read(offset) == '0' ){
++offset;
}else{
return make_error<err::buffer_exhausted>();
}
{
std::string_view num_view{reinterpret_cast<char*>(&buff.read()), offset};
typename native_data_type<schema::Primitive<T,N>>::type result;
auto fc_result = std::from_chars(num_view.data(), num_view.data() + num_view.size(), result);
if(fc_result.ec != std::errc{}){
return make_error<err::invalid_state>();
}
to.set(result);
}
buff.read_advance(offset);
return void_t{};
}
};
template<typename T, size_t D, typename RootSchema, typename ToDecode>
struct json_decode<schema::Array<T,D>, RootSchema, ToDecode> {
template<size_t Level>
static error_or<void> decode_level(buffer_view& buff, data<schema::Array<T,D>, ToDecode>& to, std::array<std::size_t, D>& index){
if constexpr (Level == D) {
auto eov = json_decode<T, RootSchema, ToDecode>::decode(buff, to.at(index));
if(eov.is_error()){
return eov;
}
} else {
assert(buff.read() == '[');
buff.read_advance(1);
if( buff.read_composite_length() == 0 ){
return make_error<err::buffer_exhausted>();
}
}
return void_t{};
}
static error_or<void> decode(buffer_view& buff, data<schema::Array<T,D>, ToDecode>& to){
std::array<std::size_t, D> index;
return decode_level<0>(buff, to, index);
}
};
}
}
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