1 files changed, 69 insertions, 0 deletions
diff --git a/include/openvic-dataloader/File.hpp b/include/openvic-dataloader/File.hpp
new file mode 100644
index 0000000..caa4a0a
--- /dev/null
+++ b/include/openvic-dataloader/File.hpp
@@ -0,0 +1,69 @@
+#pragma once
+
+#include <concepts>
+
+#include <openvic-dataloader/NodeLocation.hpp>
+#include <openvic-dataloader/detail/LexyFwdDeclaration.hpp>
+
+#include <dryad/node_map.hpp>
+
+namespace ovdl {
+	template<typename T>
+	concept IsEncoding = requires(T t) {
+		typename T::char_type;
+		typename T::int_type;
+		{ T::template is_secondary_char_type<typename T::char_type>() } -> std::same_as<bool>;
+		{ T::eof() } -> std::same_as<typename T::int_type>;
+		{ T::to_int_type(typename T::char_type {}) } -> std::same_as<typename T::int_type>;
+	};
+
+	struct File {
+		explicit File(const char* path);
+
+		const char* path() const noexcept;
+
+	protected:
+		const char* _path;
+	};
+
+	template<typename T>
+	concept IsFile =
+		std::derived_from<T, File> && IsEncoding<typename T::encoding_type> &&
+		requires(T t, const typename T::node_type* node, NodeLocation location) {
+			{ t.buffer() } -> std::same_as<const lexy::buffer<typename T::encoding_type, void>&>;
+			{ t.set_location(node, location) } -> std::same_as<void>;
+			{ t.location_of(node) } -> std::same_as<NodeLocation>;
+		};
+
+	template<typename EncodingT, typename NodeT>
+	struct BasicFile : File {
+		using encoding_type = EncodingT;
+		using node_type = NodeT;
+
+		explicit BasicFile(const char* path, lexy::buffer<encoding_type, void>&& buffer)
+			: File(path),
+			  _buffer(static_cast<std ::remove_reference_t<decltype(buffer)>&&>(buffer)) {}
+
+		explicit BasicFile(lexy::buffer<encoding_type, void>&& buffer)
+			: File(""),
+			  _buffer(static_cast<std ::remove_reference_t<decltype(buffer)>&&>(buffer)) {}
+
+		const lexy::buffer<encoding_type, void>& buffer() const {
+			return _buffer;
+		}
+
+		void set_location(const node_type* n, NodeLocation loc) {
+			_map.insert(n, loc);
+		}
+
+		NodeLocation location_of(const node_type* n) const {
+			auto result = _map.lookup(n);
+			DRYAD_ASSERT(result != nullptr, "every Node should have a NodeLocation");
+			return *result;
+		}
+
+	protected:
+		lexy::buffer<encoding_type, void> _buffer;
+		dryad::node_map<const node_type, NodeLocation> _map;
+	};
+}
+\ No newline at end of file