Rework Grammar and Parser

Add proper headless binary construction:
	Includes basic validation

Add Error and Warning structs to Parser
Add FileNode pointer getter to Parser
Change all `char8_t*` and `const char8_t` to `const char*` in Parser
Add Parser move operators and Parser deconstructor
Add BufferHandler PIMPL object to Parser
Add UTF-8 file Warning to v2script
Add proper Grammar value retrieval
Add AbstractSyntaxTree for v2script data parser:
	Has compile-time embedded type information accessible at compile-time and runtime
	Has Tab-based print functionality

Fix wrong environment reference for headless construction in SConstruct
Add error retrieval
Add BasicCallbackOStreamBuffer for callback streaming
Add CallbackStreamBuffer for char
Add CallbackWStreamBuffer for wchar_t
Add BasicCallbackStream
Add CallbackStream for char
Add CallbackWStream for wchar_t
Add grammar for events and decisions
Add event_parse to Parser
Add decision_parse to Parser
Add .clang-format
Ignore dirty lexy module
Add CSV parser and grammar:
	Creates std::vector<csv::LineObject> for a list of lines

Add BasicParser and BasicBufferHandler to reduce code reduplication

12 files changed, 675 insertions, 13 deletions

diff --git a/include/openvic-dataloader/ParseData.hpp b/include/openvic-dataloader/ParseData.hpp
new file mode 100644
index 0000000..8bec7d2
--- /dev/null
+++ b/include/openvic-dataloader/ParseData.hpp
@@ -0,0 +1,11 @@
+#pragma once
+
+#include <string>
+
+namespace ovdl {
+	struct ParseData {
+		const std::string production_name;
+		const unsigned int context_start_line;
+		const unsigned int context_start_column;
+	};
+}
\ No newline at end of file
diff --git a/include/openvic-dataloader/ParseError.hpp b/include/openvic-dataloader/ParseError.hpp
new file mode 100644
index 0000000..9e4541e
--- /dev/null
+++ b/include/openvic-dataloader/ParseError.hpp
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <string>
+
+#include <openvic-dataloader/ParseData.hpp>
+
+namespace ovdl {
+	struct ParseError {
+		const enum class Type : unsigned char {
+			Recoverable,
+			Fatal
+		} type;
+		const std::string message;
+		const int error_value;
+		const ParseData parse_data;
+		const unsigned int start_line;
+		const unsigned int start_column;
+	};
+
+}
\ No newline at end of file
diff --git a/include/openvic-dataloader/ParseWarning.hpp b/include/openvic-dataloader/ParseWarning.hpp
new file mode 100644
index 0000000..307599f
--- /dev/null
+++ b/include/openvic-dataloader/ParseWarning.hpp
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <string>
+
+namespace ovdl {
+	struct ParseWarning {
+		const std::string message;
+		const int warning_value;
+	};
+}
\ No newline at end of file
diff --git a/include/openvic-dataloader/csv/LineObject.hpp b/include/openvic-dataloader/csv/LineObject.hpp
new file mode 100644
index 0000000..0494ffb
--- /dev/null
+++ b/include/openvic-dataloader/csv/LineObject.hpp
@@ -0,0 +1,84 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+#include <functional>
+#include <initializer_list>
+#include <optional>
+#include <string>
+#include <string_view>
+#include <tuple>
+#include <vector>
+
+namespace ovdl::csv {
+	/// LineObject should be able to recognize the differences between:
+	///	Input -> Indexes == ""
+	/// ;;a;b;c;; -> 0,1,5,6+ == ""
+	/// a;b;c -> 3+ == ""
+	/// a;;b;c;; -> 1,4,5+ == ""
+	/// a;b;;c; -> 2,4+ == ""
+	/// a;b;c;; -> 3,4+ == ""
+	/// a;b;c; -> 3+ == ""
+	/// ;a;b;c -> 0,4+ == ""
+	///
+	/// If this is incorrect, please report an issue.
+	class LineObject final : public std::vector<std::tuple<std::uint32_t, std::string>> {
+	public:
+		// Stored position of value
+		using position_type = std::uint32_t;
+		// Value
+		using inner_value_type = std::string;
+		using container_type = std::vector<std::tuple<position_type, inner_value_type>>;
+
+		constexpr LineObject() = default;
+		constexpr LineObject(LineObject&) = default;
+		constexpr LineObject(LineObject&&) = default;
+		constexpr LineObject(const LineObject&) = default;
+
+		constexpr LineObject& operator=(const LineObject& other) = default;
+		constexpr LineObject& operator=(LineObject&& other) = default;
+
+		constexpr ~LineObject() = default;
+
+		constexpr LineObject(std::initializer_list<value_type> pos_and_val) : container_type(pos_and_val) {
+		}
+
+		constexpr LineObject(position_type prefix_end, std::initializer_list<value_type> pos_and_val, position_type suffix_end = 0)
+			: container_type(pos_and_val),
+			  _prefix_end(prefix_end),
+			  _suffix_end(suffix_end) {
+		}
+
+		/// Special Functionality
+		/// Retrieves value, produces "" for empty values
+		constexpr std::string_view get_value_for(std::size_t position) const {
+			if (position <= _prefix_end || position >= _suffix_end) return "";
+			for (const auto& [pos, val] : *this) {
+				if (pos == position) return val;
+			}
+			return "";
+		}
+		/// Tries to retrieve reference, produces nullopt for empty values
+		constexpr std::optional<const std::reference_wrapper<const std::string>> try_get_string_at(std::size_t position) const {
+			if (position <= _prefix_end || position > _suffix_end) return std::nullopt;
+			for (const auto& [pos, val] : *this) {
+				if (pos == position) return std::cref(val);
+			}
+			return std::nullopt;
+		}
+
+		constexpr position_type prefix_end() const { return _prefix_end; }
+		constexpr void set_prefix_end(position_type value) { _prefix_end = value; }
+
+		constexpr position_type suffix_end() const { return _suffix_end; }
+		constexpr void set_suffix_end(position_type value) { _suffix_end = value; }
+
+		constexpr std::size_t value_count() const { return _suffix_end; }
+
+	private:
+		// Should be position of first valid value on line
+		position_type _prefix_end;
+		// Should be position after last value or position after last seperator
+		position_type _suffix_end;
+	};
+}
\ No newline at end of file
diff --git a/include/openvic-dataloader/csv/Parser.hpp b/include/openvic-dataloader/csv/Parser.hpp
new file mode 100644
index 0000000..3497864
--- /dev/null
+++ b/include/openvic-dataloader/csv/Parser.hpp
@@ -0,0 +1,42 @@
+#pragma once
+
+#include <openvic-dataloader/csv/LineObject.hpp>
+#include <openvic-dataloader/detail/BasicParser.hpp>
+
+namespace ovdl::csv {
+	class Parser final : public detail::BasicParser {
+	public:
+		Parser();
+
+		static Parser from_buffer(const char* data, std::size_t size);
+		static Parser from_buffer(const char* start, const char* end);
+		static Parser from_string(const std::string_view string);
+		static Parser from_file(const char* path);
+		static Parser from_file(const std::filesystem::path& path);
+
+		constexpr Parser& load_from_buffer(const char* data, std::size_t size);
+		constexpr Parser& load_from_buffer(const char* start, const char* end);
+		constexpr Parser& load_from_string(const std::string_view string);
+		constexpr Parser& load_from_file(const char* path);
+		Parser& load_from_file(const std::filesystem::path& path);
+
+		constexpr Parser& load_from_file(const detail::Has_c_str auto& path);
+
+		bool parse_csv();
+
+		const std::vector<csv::LineObject> get_lines() const;
+
+		Parser(Parser&&);
+		Parser& operator=(Parser&&);
+
+		~Parser();
+
+	private:
+		class BufferHandler;
+		std::unique_ptr<BufferHandler> _buffer_handler;
+		std::vector<csv::LineObject> _lines;
+
+		template<typename... Args>
+		constexpr void _run_load_func(detail::LoadCallback<BufferHandler, Args...> auto func, Args... args);
+	};
+}
\ No newline at end of file
diff --git a/include/openvic-dataloader/detail/BasicParser.hpp b/include/openvic-dataloader/detail/BasicParser.hpp
new file mode 100644
index 0000000..5493804
--- /dev/null
+++ b/include/openvic-dataloader/detail/BasicParser.hpp
@@ -0,0 +1,37 @@
+#pragma once
+
+#include <filesystem>
+#include <optional>
+#include <string_view>
+#include <vector>
+
+#include <openvic-dataloader/ParseError.hpp>
+#include <openvic-dataloader/ParseWarning.hpp>
+#include <openvic-dataloader/detail/Concepts.hpp>
+
+namespace ovdl::detail {
+	class BasicParser {
+	public:
+		BasicParser();
+
+		void set_error_log_to_null();
+		void set_error_log_to_stderr();
+		void set_error_log_to_stdout();
+		void set_error_log_to(std::basic_ostream<char>& stream);
+
+		bool has_error() const;
+		bool has_fatal_error() const;
+		bool has_warning() const;
+
+		const std::vector<ParseError>& get_errors() const;
+		const std::vector<ParseWarning>& get_warnings() const;
+
+	protected:
+		std::vector<ParseError> _errors;
+		std::vector<ParseWarning> _warnings;
+
+		std::reference_wrapper<std::ostream> _error_stream;
+		const char* _file_path;
+		bool _has_fatal_error = false;
+	};
+}
\ No newline at end of file
diff --git a/include/openvic-dataloader/detail/CallbackOStream.hpp b/include/openvic-dataloader/detail/CallbackOStream.hpp
new file mode 100644
index 0000000..641d53f
--- /dev/null
+++ b/include/openvic-dataloader/detail/CallbackOStream.hpp
@@ -0,0 +1,100 @@
+#pragma once
+
+#include <cstring>
+#include <functional>
+#include <ostream>
+#include <type_traits>
+
+namespace ovdl::detail {
+	template<typename Callback, class CHAR_T, class traits = std::char_traits<CHAR_T>>
+	class BasicCallbackStreamBuffer : public std::basic_streambuf<CHAR_T, traits> {
+	public:
+		using base_type = std::basic_streambuf<CHAR_T, traits>;
+		using callback_type = Callback;
+		using char_type = typename base_type::char_type;
+		using int_type = typename base_type::int_type;
+
+		BasicCallbackStreamBuffer(Callback cb, void* user_data = nullptr)
+			: _callback(cb),
+			  _user_data(user_data) {}
+
+	protected:
+		std::streamsize xsputn(const char_type* s, std::streamsize n) override {
+			if constexpr (std::is_same_v<void, typename decltype(std::function { _callback })::result_type>) {
+				_callback(s, n, _user_data);
+				return n;
+			} else {
+				return _callback(s, n, _user_data); // returns the number of characters successfully written.
+			}
+		};
+
+		int_type overflow(int_type ch) override {
+			if constexpr (std::is_same_v<void, typename decltype(std::function { _callback })::result_type>) {
+				_callback(&ch, 1, _user_data);
+				return 1;
+			} else {
+				return _callback(&ch, 1, _user_data); // returns the number of characters successfully written.
+			}
+		}
+
+	private:
+		Callback _callback;
+		void* _user_data;
+	};
+
+	template<typename Callback>
+	class CallbackStreamBuffer : public BasicCallbackStreamBuffer<Callback, char> {
+	public:
+		using base_type = BasicCallbackStreamBuffer<Callback, char>;
+		using callback_type = Callback;
+		using char_type = typename base_type::char_type;
+		using int_type = typename base_type::int_type;
+
+		CallbackStreamBuffer(Callback cb, void* user_data = nullptr) : base_type(cb, user_data) {}
+	};
+
+	template<typename Callback>
+	class CallbackWStreamBuffer : public BasicCallbackStreamBuffer<Callback, wchar_t> {
+	public:
+		using base_type = BasicCallbackStreamBuffer<Callback, wchar_t>;
+		using callback_type = Callback;
+		using char_type = typename base_type::char_type;
+		using int_type = typename base_type::int_type;
+
+		CallbackWStreamBuffer(Callback cb, void* user_data = nullptr) : base_type(cb, user_data) {}
+	};
+
+	template<typename Callback, class CHAR_T, class traits = std::char_traits<CHAR_T>>
+	class BasicCallbackStream : public std::basic_ostream<CHAR_T, traits> {
+	public:
+		using base_type = std::basic_ostream<CHAR_T, traits>;
+
+		BasicCallbackStream(Callback cb, void* user_data = nullptr)
+			: m_sbuf(cb, user_data),
+			  std::basic_ios<CHAR_T, traits>(&m_sbuf),
+			  std::basic_ostream<CHAR_T, traits>(&m_sbuf) {
+			std::basic_ios<CHAR_T, traits>::init(&m_sbuf);
+		}
+
+	private:
+		BasicCallbackStreamBuffer<Callback, CHAR_T, traits> m_sbuf;
+	};
+
+	template<typename Callback>
+	class CallbackStream : public BasicCallbackStream<Callback, char> {
+	public:
+		using base_type = BasicCallbackStream<Callback, char>;
+
+		CallbackStream(Callback cb, void* user_data = nullptr) : base_type(cb, user_data) {
+		}
+	};
+
+	template<typename Callback>
+	class CallbackWStream : public BasicCallbackStream<Callback, wchar_t> {
+	public:
+		using base_type = BasicCallbackStream<Callback, wchar_t>;
+
+		CallbackWStream(Callback cb, void* user_data = nullptr) : base_type(cb, user_data) {
+		}
+	};
+}
\ No newline at end of file
diff --git a/include/openvic-dataloader/detail/Concepts.hpp b/include/openvic-dataloader/detail/Concepts.hpp
new file mode 100644
index 0000000..3e1c785
--- /dev/null
+++ b/include/openvic-dataloader/detail/Concepts.hpp
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <concepts>
+#include <optional>
+#include <type_traits>
+#include <utility>
+
+#include <openvic-dataloader/ParseError.hpp>
+
+namespace ovdl::detail {
+	template<typename T, typename Self, typename... Args>
+	concept LoadCallback =
+		requires(T t, Self* self, Args... args) {
+			{ t(self, std::forward<Args>(args)...) } -> std::same_as<std::optional<ParseError>>;
+		};
+
+	template<typename T>
+	concept Has_c_str =
+		requires(T t) {
+			{ t.c_str() } -> std::same_as<const char*>;
+		};
+}
\ No newline at end of file
diff --git a/include/openvic-dataloader/detail/SelfType.hpp b/include/openvic-dataloader/detail/SelfType.hpp
new file mode 100644
index 0000000..5209700
--- /dev/null
+++ b/include/openvic-dataloader/detail/SelfType.hpp
@@ -0,0 +1,28 @@
+#pragma once
+
+#include <type_traits>
+
+namespace ovdl::detail {
+#if !defined(_MSC_VER)
+#pragma GCC diagnostic push
+#pragma clang diagnostic ignored "-Wunknown-warning-option"
+#pragma GCC diagnostic ignored "-Wnon-template-friend"
+#endif
+	template<typename T>
+	struct Reader {
+		friend auto adl_GetSelfType(Reader<T>);
+	};
+
+	template<typename T, typename U>
+	struct Writer {
+		friend auto adl_GetSelfType(Reader<T>) { return U {}; }
+	};
+#if !defined(_MSC_VER)
+#pragma GCC diagnostic pop
+#endif
+
+	inline void adl_GetSelfType() {}
+
+	template<typename T>
+	using Read = std::remove_pointer_t<decltype(adl_GetSelfType(Reader<T> {}))>;
+}
diff --git a/include/openvic-dataloader/detail/TypeName.hpp b/include/openvic-dataloader/detail/TypeName.hpp
new file mode 100644
index 0000000..1a34a0f
--- /dev/null
+++ b/include/openvic-dataloader/detail/TypeName.hpp
@@ -0,0 +1,52 @@
+#pragma once
+
+#include <array>
+#include <cstddef>
+#include <string_view>
+#include <utility>
+
+namespace ovdl::detail {
+
+	template<std::size_t... Idxs>
+	constexpr auto substring_as_array(std::string_view str, std::index_sequence<Idxs...>) {
+		return std::array { str[Idxs]... };
+	}
+
+	template<typename T>
+	constexpr auto type_name_array() {
+#if defined(__clang__)
+		constexpr auto prefix = std::string_view { "[T = " };
+		constexpr auto suffix = std::string_view { "]" };
+		constexpr auto function = std::string_view { __PRETTY_FUNCTION__ };
+#elif defined(__GNUC__)
+		constexpr auto prefix = std::string_view { "with T = " };
+		constexpr auto suffix = std::string_view { "]" };
+		constexpr auto function = std::string_view { __PRETTY_FUNCTION__ };
+#elif defined(_MSC_VER)
+		constexpr auto prefix = std::string_view { "type_name_array<" };
+		constexpr auto suffix = std::string_view { ">(void)" };
+		constexpr auto function = std::string_view { __FUNCSIG__ };
+#else
+#error Unsupported compiler
+#endif
+
+		constexpr auto start = function.find(prefix) + prefix.size();
+		constexpr auto end = function.rfind(suffix);
+
+		static_assert(start < end);
+
+		constexpr auto name = function.substr(start, (end - start));
+		return substring_as_array(name, std::make_index_sequence<name.size()> {});
+	}
+
+	template<typename T>
+	struct type_name_holder {
+		static inline constexpr auto value = type_name_array<T>();
+	};
+
+	template<typename T>
+	constexpr auto type_name() -> std::string_view {
+		constexpr auto& value = type_name_holder<T>::value;
+		return std::string_view { value.data(), value.size() };
+	}
+}
\ No newline at end of file
diff --git a/include/openvic-dataloader/v2script/AbstractSyntaxTree.hpp b/include/openvic-dataloader/v2script/AbstractSyntaxTree.hpp
new file mode 100644
index 0000000..7b382fd
--- /dev/null
+++ b/include/openvic-dataloader/v2script/AbstractSyntaxTree.hpp
@@ -0,0 +1,224 @@
+#pragma once
+
+#include <iostream>
+#include <memory>
+#include <optional>
+#include <string>
+#include <string_view>
+#include <type_traits>
+#include <utility>
+#include <vector>
+
+#include <openvic-dataloader/detail/SelfType.hpp>
+#include <openvic-dataloader/detail/TypeName.hpp>
+
+#define OVDL_PRINT_FUNC_DEF std::ostream& print(std::ostream& stream, size_t indent) const override
+
+// defines get_type_static and get_type for string type naming
+#define OVDL_RT_TYPE_DEF                                                                              \
+	static constexpr std::string_view get_type_static() { return ::ovdl::detail::type_name<type>(); } \
+	constexpr std::string_view get_type() const override { return ::ovdl::detail::type_name<std::decay_t<decltype(*this)>>(); }
+
+// defines type for self-class referencing
+#define OVDL_TYPE_DEFINE_SELF                                                                                \
+	struct _self_type_tag {};                                                                                \
+	constexpr auto _self_type_helper()->decltype(::ovdl::detail::Writer<_self_type_tag, decltype(this)> {}); \
+	using type = ::ovdl::detail::Read<_self_type_tag>;
+
+namespace ovdl::v2script::ast {
+
+	struct Node;
+	using NodePtr = Node*;
+	using NodeCPtr = const Node*;
+	using NodeUPtr = std::unique_ptr<Node>;
+
+	struct Node {
+		Node(const Node&) = delete;
+		Node& operator=(const Node&) = delete;
+		Node() = default;
+		Node(Node&&) = default;
+		Node& operator=(Node&&) = default;
+		virtual ~Node() = default;
+
+		virtual std::ostream& print(std::ostream& stream, size_t indent) const = 0;
+		static std::ostream& print_ptr(std::ostream& stream, NodeCPtr node, size_t indent);
+		explicit operator std::string() const;
+
+		static constexpr std::string_view get_type_static() { return detail::type_name<Node>(); }
+		constexpr virtual std::string_view get_type() const = 0;
+
+		template<typename T>
+		constexpr bool is_type() const {
+			return get_type().compare(detail::type_name<T>()) == 0;
+		}
+
+		template<typename T>
+		constexpr std::optional<T&> cast_to() {
+			if (is_type<T>()) return static_cast<T>(*this);
+			return std::nullopt;
+		}
+	};
+
+	inline std::ostream& operator<<(std::ostream& stream, Node const& node) {
+		return node.print(stream, 0);
+	}
+	inline std::ostream& operator<<(std::ostream& stream, NodeCPtr node) {
+		return Node::print_ptr(stream, node, 0);
+	}
+
+	template<class T, class... Args>
+	NodePtr make_node_ptr(Args&&... args) {
+		if constexpr (std::is_pointer_v<NodePtr>) {
+			return new T(std::forward<Args>(args)...);
+		} else {
+			return NodePtr(new T(std::forward<Args>(args)...));
+		}
+	}
+
+	template<typename To, typename From>
+	To& cast_node_ptr(const From& from) {
+		if constexpr (std::is_pointer_v<NodePtr>) {
+			return *static_cast<To*>(from);
+		} else {
+			return *static_cast<To*>(from.get());
+		}
+	}
+
+	template<typename To, typename From>
+	const To& cast_node_cptr(const From& from) {
+		if constexpr (std::is_pointer_v<NodePtr>) {
+			return *static_cast<const To*>(from);
+		} else {
+			return *static_cast<const To*>(from.get());
+		}
+	}
+
+	void copy_into_node_ptr_vector(const std::vector<NodePtr>& source, std::vector<NodeUPtr>& dest);
+
+	struct AbstractStringNode : public Node {
+		std::string _name;
+		explicit AbstractStringNode(std::string&& name);
+		OVDL_TYPE_DEFINE_SELF;
+		OVDL_RT_TYPE_DEF;
+		OVDL_PRINT_FUNC_DEF;
+	};
+
+#define OVDL_AST_STRING_NODE(NAME)                  \
+	struct NAME final : public AbstractStringNode { \
+		explicit NAME(std::string&& name);          \
+		OVDL_TYPE_DEFINE_SELF;                      \
+		OVDL_RT_TYPE_DEF;                           \
+		OVDL_PRINT_FUNC_DEF;                        \
+	}
+
+	// Value Expression Nodes
+	OVDL_AST_STRING_NODE(IdentifierNode);
+	OVDL_AST_STRING_NODE(StringNode);
+
+	// Assignment Nodes
+	OVDL_AST_STRING_NODE(FactorNode);
+	OVDL_AST_STRING_NODE(MonthNode);
+	OVDL_AST_STRING_NODE(NameNode);
+	OVDL_AST_STRING_NODE(FireOnlyNode);
+	OVDL_AST_STRING_NODE(IdNode);
+	OVDL_AST_STRING_NODE(TitleNode);
+	OVDL_AST_STRING_NODE(DescNode);
+	OVDL_AST_STRING_NODE(PictureNode);
+	OVDL_AST_STRING_NODE(IsTriggeredNode);
+
+#undef OVDL_AST_STRING_NODE
+
+	struct AssignNode final : public Node {
+		std::string _name;
+		NodeUPtr _initializer;
+		explicit AssignNode(NodeCPtr name, NodePtr init);
+		OVDL_TYPE_DEFINE_SELF;
+		OVDL_RT_TYPE_DEF;
+		OVDL_PRINT_FUNC_DEF;
+	};
+
+	struct AbstractListNode : public Node {
+		std::vector<NodeUPtr> _statements;
+		AbstractListNode(const std::vector<NodePtr>& statements = std::vector<NodePtr> {});
+		OVDL_TYPE_DEFINE_SELF;
+		OVDL_RT_TYPE_DEF;
+		OVDL_PRINT_FUNC_DEF;
+	};
+
+#define OVDL_AST_LIST_NODE(NAME)                                                         \
+	struct NAME final : public AbstractListNode {                                        \
+		explicit NAME(const std::vector<NodePtr>& statements = std::vector<NodePtr> {}); \
+		OVDL_TYPE_DEFINE_SELF;                                                           \
+		OVDL_RT_TYPE_DEF;                                                                \
+		OVDL_PRINT_FUNC_DEF;                                                             \
+	}
+
+	OVDL_AST_LIST_NODE(FileNode);
+	OVDL_AST_LIST_NODE(ListNode);
+
+	OVDL_AST_LIST_NODE(ModifierNode);
+	OVDL_AST_LIST_NODE(MtthNode);
+	OVDL_AST_LIST_NODE(EventOptionNode);
+	OVDL_AST_LIST_NODE(BehaviorListNode);
+	OVDL_AST_LIST_NODE(DecisionListNode);
+
+#undef OVDL_AST_LIST_NODE
+
+	struct EventNode final : public Node {
+		enum class Type {
+			Country,
+			Province
+		} _type;
+		std::vector<NodeUPtr> _statements;
+		explicit EventNode(Type type, const std::vector<NodePtr>& statements = {});
+		OVDL_TYPE_DEFINE_SELF;
+		OVDL_RT_TYPE_DEF;
+		OVDL_PRINT_FUNC_DEF;
+	};
+
+	struct DecisionNode final : public Node {
+		NodeUPtr _name;
+		std::vector<NodeUPtr> _statements;
+		explicit DecisionNode(NodePtr name, const std::vector<NodePtr>& statements = {});
+		OVDL_TYPE_DEFINE_SELF;
+		OVDL_RT_TYPE_DEF;
+		OVDL_PRINT_FUNC_DEF;
+	};
+
+	struct EventMtthModifierNode final : public Node {
+		NodeUPtr _factor_value;
+		std::vector<NodeUPtr> _statements;
+		EventMtthModifierNode() {}
+		OVDL_TYPE_DEFINE_SELF;
+		OVDL_RT_TYPE_DEF;
+		OVDL_PRINT_FUNC_DEF;
+	};
+
+	// Packed single case
+	struct ExecutionNode final : public Node {
+		enum class Type {
+			Effect,
+			Trigger
+		} _type;
+		NodeUPtr _name;
+		NodeUPtr _initializer;
+		explicit ExecutionNode(Type type, NodePtr name, NodePtr init);
+		OVDL_TYPE_DEFINE_SELF;
+		OVDL_RT_TYPE_DEF;
+		OVDL_PRINT_FUNC_DEF;
+	};
+
+	struct ExecutionListNode final : public Node {
+		ExecutionNode::Type _type;
+		std::vector<NodeUPtr> _statements;
+		explicit ExecutionListNode(ExecutionNode::Type type, const std::vector<NodePtr>& statements);
+		OVDL_TYPE_DEFINE_SELF;
+		OVDL_RT_TYPE_DEF;
+		OVDL_PRINT_FUNC_DEF;
+	};
+
+}
+
+#undef OVDL_PRINT_FUNC_DECL
+#undef OVDL_PRINT_FUNC_DEF
+#undef OVDL_TYPE_DEFINE_SELF
\ No newline at end of file
diff --git a/include/openvic-dataloader/v2script/Parser.hpp b/include/openvic-dataloader/v2script/Parser.hpp
index 53aab90..1c524b2 100644
--- a/include/openvic-dataloader/v2script/Parser.hpp
+++ b/include/openvic-dataloader/v2script/Parser.hpp
@@ -1,27 +1,59 @@
 #pragma once
 
 #include <cstddef>
-#include <cstdio>
+#include <filesystem>
+#include <functional>
+#include <memory>
+#include <optional>
 #include <ostream>
+#include <string_view>
+#include <vector>
+
+#include <openvic-dataloader/ParseError.hpp>
+#include <openvic-dataloader/ParseWarning.hpp>
+#include <openvic-dataloader/detail/BasicParser.hpp>
+#include <openvic-dataloader/detail/Concepts.hpp>
+#include <openvic-dataloader/v2script/AbstractSyntaxTree.hpp>
 
 namespace ovdl::v2script {
-	class Parser {
+
+	using FileNode = ast::FileNode;
+
+	class Parser final : public detail::BasicParser {
 	public:
-		static Parser from_buffer(char8_t* data, std::size_t size);
-		static Parser from_buffer(char8_t* start, char8_t* end);
-		static Parser from_file(const char8_t* path);
+		Parser();
+
+		static Parser from_buffer(const char* data, std::size_t size);
+		static Parser from_buffer(const char* start, const char* end);
+		static Parser from_string(const std::string_view string);
+		static Parser from_file(const char* path);
+		static Parser from_file(const std::filesystem::path& path);
 
-		void set_error_log_to_stderr();
-		void set_error_log_path(const char8_t* path);
-		void set_error_log_to(std::basic_ostream<char8_t> stream);
-		void set_error_log_to(std::FILE* file);
+		constexpr Parser& load_from_buffer(const char* data, std::size_t size);
+		constexpr Parser& load_from_buffer(const char* start, const char* end);
+		constexpr Parser& load_from_string(const std::string_view string);
+		constexpr Parser& load_from_file(const char* path);
+		Parser& load_from_file(const std::filesystem::path& path);
 
-		bool parse();
+		constexpr Parser& load_from_file(const detail::Has_c_str auto& path);
 
-		bool has_error();
-		bool has_warning();
+		bool simple_parse();
+		bool event_parse();
+		bool decision_parse();
+
+		const FileNode* get_file_node() const;
+
+		Parser(Parser&&);
+		Parser& operator=(Parser&&);
+
+		~Parser();
 
 	private:
-		Parser();
+		class BufferHandler;
+		std::unique_ptr<BufferHandler> _buffer_handler;
+		std::unique_ptr<FileNode> _file_node;
+
+		template<typename... Args>
+		constexpr void _run_load_func(detail::LoadCallback<BufferHandler, Args...> auto func, Args... args);
 	};
 }
\ No newline at end of file