From 8a7c83e646656361ab322467ad96eb6a6b09a074 Mon Sep 17 00:00:00 2001
From: Claudius 'keldu' Holeksa <mail@keldu.de>
Date: Wed, 24 Jul 2024 15:55:35 +0200
Subject: wip

---
 modules/codec/c++/csv.hpp | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

(limited to 'modules/codec/c++')

diff --git a/modules/codec/c++/csv.hpp b/modules/codec/c++/csv.hpp
index 2d11bff..82010d7 100644
--- a/modules/codec/c++/csv.hpp
+++ b/modules/codec/c++/csv.hpp
@@ -12,6 +12,23 @@ struct Csv {};
 }
 
 namespace impl {
+struct csv_helper {
+	static bool is_whitespace(int8_t ch){
+		/**
+		 * @TODO supply relevant control characters for checks.
+		 * Newlines are whitespace technically, but also control characters in CSV.
+		 * Contrary to JSON for example.
+		 */
+		return ch == '\t' || ch == ' ';
+	}
+
+	static void skip_whitespace(buffer_view& buff){
+		while(buff.read_composite_length() > 0 && csv_helper::is_whitespace(buff.read())){
+			buff.read_advance(1u);
+		}
+	}
+};
+
 template<typename Schema, typename FromDecode>
 struct csv_encode {
 	static_assert(always_false<Schema, FromDecode>, "Case not supported");
@@ -176,6 +193,33 @@ struct csv_encode<schema::Primitive<T,N>, FromDecode> {
 		return make_void();
 	}
 };
+
+template<typename Schema, typename FromDecode>
+struct csv_decode {
+	static_assert(always_false<Schema, FromDecode>, "Case not supported");
+};
+
+template<typename  T, size_t Dim, typename FromDecode>
+struct csv_decode<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> decode(data<Schema, encode::Csv>& from, data<Schema, FromDecode>& to){
+		buffer_view view{from.get_buffer()};
+		if constexpr (is_struct<T>::value) {
+			auto eov = csv_decode<T, FromDecode>::check_header(view);
+			if(eov.is_error()){
+				return eov;
+			}
+		}
+
+		uint64_t len{};
+		return make_error<err::not_implemented>();
+	}
+};
 }
 
 template<typename Schema>
-- 
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