From aa2ecacd2e477eb5748f060d33138e0c12c0634f Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Mon, 27 Nov 2023 23:03:57 +0100
Subject: codec,core,tools: Adding dangling experimental changes

---
 c++/codec/args.h       | 123 +++++++++++++++++++++++++++++++++++++++++++++++++
 c++/codec/forst.h      |  19 ++++++++
 c++/codec/forst.tmpl.h |   7 +++
 3 files changed, 149 insertions(+)
 create mode 100644 c++/codec/args.h
 create mode 100644 c++/codec/forst.tmpl.h

(limited to 'c++/codec')

diff --git a/c++/codec/args.h b/c++/codec/args.h
new file mode 100644
index 0000000..6bb75a2
--- /dev/null
+++ b/c++/codec/args.h
@@ -0,0 +1,123 @@
+#pragma once
+
+#include "schema.h"
+
+namespace saw {
+namespace encode {
+struct Args {};
+}
+
+namespace schema {
+template<typename InnerSchemaStruct, typename InnerSchemaTuple>
+using Args = Struct<
+	Member<String, "program">,
+	Member<InnerSchemaStruct, "args">,
+	Member<InnerSchemaTuple, "positionals">
+>;
+}
+
+template<typename T>
+class data<T, encode::Args> {
+	static_assert(always_false<T>,"Not supported. Use the schema::Args alias or check how it's defined.");
+};
+
+template<typename... Str, string_literal... Lits, typename... Tup>
+class data<schema::Args<schema::Struct<schema::Member<Str,Lits>...>, schema::Tuple<Tup...>>, encode::Args> {
+private:
+	char** argv_;
+	int argc_;
+public:
+	data(char** argv, int argc):
+		argv_{argv},
+		argc_{argc}
+	{}
+
+	size_t size() const {
+		if(argc_ < 0){
+			return 0;
+		}
+
+		static_assert(sizeof(int) <= sizeof(size_t), "size_t is smaller than int");
+
+		return static_cast<size_t>(argc_);
+	}
+
+	std::string_view arg_view(size_t i){
+		if(i < size()){
+			return std::string_view{argv_[i]};
+		}
+		return "";
+	}
+};
+
+namespace impl {
+template<typename T, typename ToDec>
+struct args_decode {
+	static_assert(always_false<T,ToDec>, "Not supported");
+};
+
+template<typename... Str, string_literal... Lits, typename... Tup, typename ToDec>
+struct args_decode<schema::Args<schema::Struct<schema::Member<Str,Lits>...>,schema::Tuple<Tup...>>,ToDec> {
+	using Schema = schema::Args<
+		schema::Struct<schema::Member<Str,Lits>...>,
+		schema::Tuple<Tup...>
+	>;
+
+	static error_or<void> decode(data<Schema, encode::Args>& from, data<Schema,ToDec>& to){
+		if(from.size() == 0){
+			return make_error<err::invalid_state>();
+		}
+
+		to.get<"program">().set(std::string{from.arg_view(0)});
+		std::size_t tuple_pos = 0;
+		for(size_t i = 1; i < from.size(); ++i){
+			auto view = from.arg_view(i);
+			if(view.starts_with("--")){
+				view.remove_prefix(std::min(2u, view.size()));
+				++i;
+
+				if( i >= from.size() ){
+					return make_error<err::invalid_state>();
+				}
+
+				auto value_view = from.arg_view(i);
+
+				auto eov = decode_struct_member<0>(to.get<"args">(), view, value_view);
+				if(eov.is_error()){
+					return eov;
+				}
+			} else {
+				auto eov = decode_tuple_member<0>(to.get<"positionals">(), view);
+				if(eov.is_error()){
+					return eov;
+				}
+				++tuple_pos;
+			}
+		}
+
+		if(tuple_pos != sizeof...(Tup)){
+			return make_error<err::invalid_state>();
+		}
+
+		return void_t{};
+	}
+};
+}
+
+template<typename Schema>
+class codec<Schema, encode::Args> {
+public:
+	template<typename ToDec>
+	error_or<void> decode(data<Schema, encode::Args>& from, data<Schema, ToDec>& to){
+		struct name_and_value {
+			std::string name;
+			std::string value;
+		};
+		std::string program;
+		std::vector<name_and_value> navs;
+		std::vector<std::string> positionals;
+
+		return void_t{};
+	}
+};
+}
diff --git a/c++/codec/forst.h b/c++/codec/forst.h
index cadf78e..7e8fbf0 100644
--- a/c++/codec/forst.h
+++ b/c++/codec/forst.h
@@ -6,8 +6,27 @@ namespace saw {
 namespace encode {
 struct KelForst {};
 }
+}
+
+#include "forst.tmpl.hpp"
 
+namespace saw {
 class data<schema::String, encode::KelForst> {
+private:
+	own<buffer> buff_;
+public:
+	data(own<buffer> buff):
+		buff_{std::move(buff)}
+	{}
+};
 
+template<typename... T, string_literal... Keys>
+class data<schema::Struct<schema::Member<T,Keys>...>, encode::KelForst> {
+private:
+	own<buffer> buff_;
+public:
+	data(own<buffer> buff):
+		buff_{std::move(buff)}
+	{}
 };
 }
diff --git a/c++/codec/forst.tmpl.h b/c++/codec/forst.tmpl.h
new file mode 100644
index 0000000..30d18ef
--- /dev/null
+++ b/c++/codec/forst.tmpl.h
@@ -0,0 +1,7 @@
+namespace saw {
+namespace impl {
+struct forst_decode {
+
+};
+}
+}
-- 
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