Merge pull request #7 from OpenVicProject/dataloading-event-and-functions

1 files changed, 44 insertions, 0 deletions

diff --git a/src/openvic-dataloader/detail/BasicBufferHandler.hpp b/src/openvic-dataloader/detail/BasicBufferHandler.hpp
new file mode 100644
index 0000000..ba2cef9
--- /dev/null
+++ b/src/openvic-dataloader/detail/BasicBufferHandler.hpp
@@ -0,0 +1,44 @@
+#pragma once
+
+#include <optional>
+
+#include <openvic-dataloader/ParseError.hpp>
+
+#include <lexy/encoding.hpp>
+#include <lexy/input/buffer.hpp>
+#include <lexy/input/file.hpp>
+
+#include "detail/Errors.hpp"
+
+namespace ovdl::detail {
+	template<typename Encoding = lexy::default_encoding, typename MemoryResource = void>
+	class BasicBufferHandler {
+	public:
+		constexpr bool is_valid() const {
+			return _buffer.size() != 0;
+		}
+
+		constexpr std::optional<ovdl::ParseError> load_buffer_size(const char* data, std::size_t size) {
+			_buffer = lexy::buffer<Encoding, MemoryResource>(data, size);
+			return std::nullopt;
+		}
+
+		constexpr std::optional<ovdl::ParseError> load_buffer(const char* start, const char* end) {
+			_buffer = lexy::buffer<Encoding, MemoryResource>(start, end);
+			return std::nullopt;
+		}
+
+		std::optional<ovdl::ParseError> load_file(const char* path) {
+			auto file = lexy::read_file<Encoding, lexy::encoding_endianness::bom, MemoryResource>(path);
+			if (!file) {
+				return ovdl::errors::make_no_file_error(path);
+			}
+
+			_buffer = file.buffer();
+			return std::nullopt;
+		}
+
+	protected:
+		lexy::buffer<Encoding, MemoryResource> _buffer;
+	};
+}
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