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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{};
}
};
}
}
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