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

2 files changed, 269 insertions, 13 deletions

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