#pragma once

// Standard C++
#include <istream>
#include <span>
#include <string_view>
#include <vector>

class XML {
public:
	XML()                      = default;
	virtual ~XML()             = default;
	XML(const XML&)            = default;
	XML(XML&&)                 = default;
	XML& operator=(const XML&) = default;
	XML& operator=(XML&&)      = default;

	void parse(std::istream& ins);

protected:
	virtual void handle_start(std::string_view name, const std::vector<std::tuple<std::string_view, std::string_view>>& attr) = 0;
	virtual void handle_end(std::string_view name)                                                                            = 0;
	virtual void handle_cdata_start() {}
	virtual void handle_cdata_end() {}
	virtual void handle_character_data(std::span<const char> /* data */) {}

private:
	static void tag_start(void* self, const char* name, const char** attr);
	static void tag_end(void* self, const char* name);
	static void cdata_start(void* self);
	static void cdata_end(void* self);
	static void data(void* self, const char* dat, int len);
};