codec: Adding a basic csv decoder. Unfinished

1 files changed, 47 insertions, 0 deletions

diff --git a/modules/codec/c++/csv.h b/modules/codec/c++/csv.h
index 67c2c1d..3727829 100644
--- a/modules/codec/c++/csv.h
+++ b/modules/codec/c++/csv.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <forstio/error.h>
+
 #include "data.h"
 
 namespace saw {
@@ -7,8 +9,53 @@ namespace encode {
 struct Csv {};
 }
 
+namespace impl {
+template<typename Schema, typename FromDecode>
+struct csv_encode {
+	static_assert(always_false<T>, "Case not supported");
+};
+
+template<typename  T, size_t Dim>
+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, data<Schema, encode::Csv>& to){
+		if constexpr (is_struct<T>::value){
+			auto eov = csv_encode<T>::encode_header(to);
+			if(eov.is_error()){
+				return eov;
+			}
+		}
+
+		for(std::size_t i = 0; i < from.size(); ++i){
+			auto eov = csv_encode<T>::encode(from.at(i), to);
+			if(eov.is_error()){
+				return eov;
+			}
+		}
+		
+		return void_t{};
+	}
+};
+
+template<>
+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 void_t{};
+	}
+};
+}
+
 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){