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#pragma once
#include <forstio/error.h>
#include <forstio/buffer.h>
#include "data.h"
#include "stream_value.h"
namespace saw {
namespace encode {
struct Csv {};
}
namespace impl {
template<typename Schema, typename FromDecode>
struct csv_encode {
static_assert(always_false<Schema, FromDecode>, "Case not supported");
};
template<typename T, size_t Dim, typename FromDecode>
struct csv_encode<schema::Array<T,Dim>, FromDecode> {
static_assert(Dim == 1, "Only one dimension is allowed.");
static_assert(!is_array<T>::value, "Array of an array is not allowed.");
static_assert(is_tuple<T>::value || is_struct<T>::value, "Only struct or tuples allowed inside a csv array");
using Schema = schema::Array<T,Dim>;
static error_or<void> encode(const data<Schema, FromDecode>& from, buffer& to){
if constexpr (is_struct<T>::value){
auto eov = csv_encode<T,FromDecode>::encode_header(to);
if(eov.is_error()){
return eov;
}
}
for(std::size_t i = 0; i < from.size(); ++i){
auto eov = csv_encode<T,FromDecode>::encode(from.at(i), to);
if(eov.is_error()){
return eov;
}
}
return void_t{};
}
};
template<typename... V, string_literal... K, typename FromDecode>
struct csv_encode<schema::Struct<schema::Member<V,K>...>, FromDecode> {
using Schema = schema::Struct<schema::Member<V,K>...>;
template<size_t i>
static error_or<void> encode_header_i(buffer& to){
// Encode string
//
constexpr auto str_view = parameter_key_pack_type<i, K...>::literal;
for(auto& iter : str_view.view()){
auto eov = stream_value<schema::Int8>::encode(iter, to);
if(eov.is_error()){
return eov;
}
}
// Go to next string
if constexpr ( (i+1) < sizeof...(K)){
/**
* Replace this with col separator
*/
constexpr std::string_view lit = ",";
for(int8_t iter : lit){
auto eov = stream_value<schema::Int8>::encode(iter, to);
if(eov.is_error()){
return eov;
}
}
return encode_header_i<i+1>(to);
}
{
/**
* Replace this with row separator
*/
constexpr std::string_view lit = "\r\n";
for(int8_t iter : lit){
auto eov = stream_value<schema::Int8>::encode(iter, to);
if ( eov.is_error()){
return eov;
}
}
}
return make_void();
}
static error_or<void> encode_header(buffer& to){
return encode_header_i<0>(to);
}
template<size_t i>
static error_or<void> encode_i(const data<Schema, FromDecode>& from, buffer& to){
constexpr auto str_view = parameter_key_pack_type<i,K...>::literal;
{
auto eov = csv_encode<typename parameter_pack_type<i,V...>::type, FromDecode>::encode(from.template get<str_view>(), to);
if(eov.is_error()){
return eov;
}
}
if constexpr ( (i+1) < sizeof...(K)){
/**
* Replace this with col separator
*/
constexpr std::string_view lit = ",";
for(int8_t iter : lit){
auto eov = stream_value<schema::Int8>::encode(iter, to);
if(eov.is_error()){
return eov;
}
}
return encode_header(to);
}
{
/**
* Replace this with row separator
*/
constexpr std::string_view lit = "\r\n";
for(int8_t iter : lit){
auto eov = stream_value<schema::Int8>::encode(iter, to);
if ( eov.is_error()){
return eov;
}
}
}
return make_void();
}
static error_or<void> encode(const data<Schema, FromDecode>& from, buffer& to){
return encode_i<0>(from, to);
}
};
template<typename FromDecode>
struct csv_encode<schema::String, FromDecode> {
using Schema = schema::String;
static error_or<void> encode(const data<Schema, FromDecode>& from, buffer& to){
for(size_t i = 0; i < from.size(); ++i){
auto eov = stream_value<schema::Int8>::encode(from.at(i), to);
if(eov.is_error()){
return eov;
}
}
return make_void();
}
};
template<class T, size_t N, typename FromDecode>
struct csv_encode<schema::Primitive<T,N>, FromDecode> {
using Schema = schema::Primitive<T,N>;
static error_or<void> encode(const data<Schema, FromDecode>& from, buffer& to){
std::string to_str;
try {
to_str = std::to_string(from.get());
}catch(const std::exception& ){
return make_error<err::out_of_memory>();
}
for(auto iter : to_str){
auto eov = stream_value<schema::Int8>::encode(iter, to);
if(eov.is_error()){
return eov;
}
}
return make_void();
}
};
}
template<typename Schema>
class data<Schema, encode::Csv> {
private:
ring_buffer buffer_;
public:
data() = default;
buffer& get_buffer(){
return buffer_;
}
};
template<typename Schema>
class codec<Schema, encode::Csv> {
static_assert(is_array<Schema>::value, "Only an Array is allowed as a base value");
public:
template<typename FromEncode>
static error_or<void> encode(const data<Schema, FromEncode>& from, data<Schema,encode::Csv>& to){
buffer_view buff_v{to.get_buffer()};
auto eov = impl::csv_encode<Schema, FromEncode>::encode(from, buff_v);
if(eov.is_error()){
return eov;
}
to.get_buffer().write_advance(buff_v.write_offset());
return eov;
}
template<typename ToDecode>
static error_or<void> decode(data<Schema,encode::Csv>& from, data<Schema, ToDecode>& to){
return make_error<err::not_implemented>();
}
};
}
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