From 24d06051231a28ba75bd45fbc792dd4f2e30fddd Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 8 Jan 2024 20:45:54 +0100
Subject: codec: Dangling csv changes

---
 modules/codec/c++/csv.h | 140 +++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 127 insertions(+), 13 deletions(-)

(limited to 'modules')

diff --git a/modules/codec/c++/csv.h b/modules/codec/c++/csv.h
index 1664c31..7a3a18e 100644
--- a/modules/codec/c++/csv.h
+++ b/modules/codec/c++/csv.h
@@ -1,8 +1,10 @@
 #pragma once
 
 #include <forstio/error.h>
+#include <forstio/buffer.h>
 
 #include "data.h"
+#include "stream_value.h"
 
 namespace saw {
 namespace encode {
@@ -23,7 +25,7 @@ struct csv_encode<schema::Array<T,Dim>, FromDecode> {
 
 	using Schema = schema::Array<T,Dim>;
 
-	static error_or<void> encode(const data<Schema, FromDecode>& from, data<Schema, encode::Csv>& to){
+	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()){
@@ -46,14 +48,96 @@ 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>...>;
 
-	static error_or<void> encode_header(const data<Schema, encode::Csv>& to){
-		return make_error<err::not_implemented>();
+	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(const data<Schema, FromDecode>& from, data<Schema,encode::Csv>& to){
-		
+	static error_or<void> encode_header(buffer& to){
+		return encode_header_i<0>(to);
+	}
 
-		return make_error<err::not_implemented>();
+	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);
 	}
 };
 
@@ -61,9 +145,14 @@ template<typename FromDecode>
 struct csv_encode<schema::String, FromDecode> {
 	using Schema = schema::String;
 
-	static error_or<void> encode(const data<Schema, FromDecode>& from, data<Schema, encode::Csv>& to){
-
-		return make_error<err::not_implemented>();
+	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();
 	}
 };
 
@@ -71,9 +160,21 @@ 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, data<Schema, encode::Csv>& to){
-		
-		return make_error<err::not_implemented>();
+	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();
 	}
 };
 }
@@ -81,7 +182,13 @@ struct csv_encode<schema::Primitive<T,N>, FromDecode> {
 template<typename Schema>
 class data<Schema, encode::Csv> {
 	private:
+		ring_buffer buffer_;
 	public:
+		data() = default;
+
+		buffer& get_buffer(){
+			return buffer_;
+		}
 };
 
 template<typename Schema>
@@ -90,8 +197,15 @@ class codec<Schema, encode::Csv> {
 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()};
 
-		return make_error<err::not_implemented>();
+		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>
-- 
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