finalize schema/data setup

Signed-off-by: Folling <mail@folling.io>

src/ikarus/values/schema.hpp

@@ -0,0 +1,51 @@
+#pragma once
+
+#include <string>
+#include <variant>
+#include <vector>
+
+#include <nlohmann/json.hpp>
+
+#include <cppbase/pointer.hpp>
+#include <cppbase/result.hpp>
+
+#include <ikarus/values/errors.hpp>
+#include <ikarus/values/schema.h>
+
+struct IkarusValue;
+struct IkarusValueData;
+struct IkarusValueSchema;
+
+struct IkarusValueSchemaPrimitive {
+	IkarusValuePrimitiveType type;
+};
+
+struct IkarusValueSchemaList {
+	cppbase::owning_ptr<IkarusValueSchema> sub_schema;
+};
+
+struct IkarusValueSchemaMap {
+	cppbase::owning_ptr<IkarusValueSchema> key_schema;
+	cppbase::owning_ptr<IkarusValueSchema> value_schema;
+};
+
+struct IkarusValueSchemaTuple {
+	std::vector<cppbase::owning_ptr<IkarusValueSchema>> sub_schemas;
+};
+
+struct IkarusValueSchema {
+	using IkarusValueSchemaVariant = std::variant<
+		IkarusValueSchemaPrimitive,
+		IkarusValueSchemaList,
+		IkarusValueSchemaMap,
+		IkarusValueSchemaTuple>;
+
+	static auto from_json(nlohmann::json const & json)
+		-> cppbase::Result<IkarusValueSchema, IkarusValueSchemaParseError>;
+	static auto to_json(nlohmann::json & json, IkarusValueSchema const & value)
+		-> void;
+
+	auto validate(IkarusValueData const & data) const -> bool;
+
+	IkarusValueSchemaVariant variant;
+};