1 files changed, 81 insertions, 0 deletions
diff --git a/include/openvic-dataloader/csv/ValueNode.hpp b/include/openvic-dataloader/csv/ValueNode.hpp
new file mode 100644
index 0000000..e66dac0
--- /dev/null
+++ b/include/openvic-dataloader/csv/ValueNode.hpp
@@ -0,0 +1,81 @@
+#pragma once
+
+#include <concepts>
+#include <cstdint>
+#include <initializer_list>
+#include <optional>
+#include <string>
+#include <string_view>
+#include <type_traits>
+#include <variant>
+#include <vector>
+
+#include <fmt/compile.h>
+#include <fmt/core.h>
+#include <fmt/format.h>
+
+namespace ovdl::csv {
+	template<typename T, typename Value>
+	concept IsMap =
+		requires(T t) {
+			{ t.begin() } -> std::same_as<typename T::const_iterator>;
+			{ t.end() } -> std::same_as<typename T::const_iterator>;
+			{ t.empty() } -> std::same_as<bool>;
+			{ t.size() } -> std::same_as<typename T::size_type>;
+			{ t.at("") } -> std::same_as<const Value&>;
+			{ t.find("") } -> std::same_as<typename T::const_iterator>;
+			{ t[""] } -> std::same_as<const Value&>;
+		};
+
+	class ValueNode {
+	public:
+		struct Placeholder {
+			static constexpr char ESCAPE_CHAR = '$';
+			static constexpr std::string_view ESCAPE_STR = std::string_view { &ESCAPE_CHAR, 1 };
+
+			std::string value;
+			inline std::string as_string(std::string_view prefix = ESCAPE_STR, std::optional<std::string_view> suffix = std::nullopt) const {
+				return fmt::format(FMT_COMPILE("{}{}{}"), prefix, value, suffix.value_or(prefix));
+			}
+		};
+
+		using internal_value_type = std::variant<std::string, Placeholder>;
+		using position_type = std::uint32_t;
+
+		ValueNode();
+		ValueNode(std::string_view string, position_type position = 0);
+		ValueNode(std::vector<internal_value_type> value_list, position_type position = 0);
+		ValueNode(std::initializer_list<internal_value_type> value_list, position_type position = 0);
+
+		void set_position(position_type position);
+		position_type get_position() const;
+
+		void set_as_list(internal_value_type value);
+		void add_to_list(internal_value_type value);
+		bool list_is_empty() const;
+
+		inline std::string make_from_map(const IsMap<std::string> auto& map) const {
+			std::vector<std::string_view> pre_joined(_value_list.size());
+
+			for (auto&& value : _value_list) {
+				pre_joined.push_back(std::visit([&](auto&& arg) -> std::string_view {
+					using T = std::decay_t<decltype(arg)>;
+					if constexpr (std::is_same_v<T, std::string>) {
+						return arg;
+					} else if constexpr (std::is_same_v<T, Placeholder>) {
+						return map[arg.value];
+					}
+				},
+					value));
+			}
+
+			return fmt::format(FMT_COMPILE("{}"), fmt::join(pre_joined, ""));
+		}
+
+		std::string make(std::string_view prefix = Placeholder::ESCAPE_STR, std::optional<std::string_view> suffix = std::nullopt) const;
+
+	private:
+		position_type _position;
+		std::vector<internal_value_type> _value_list;
+	};
+}
+\ No newline at end of file