Refactored the ansi_parser into a class that can be reused between render calls.

ansi_parser.hpp

@@ -1,7 +1,21 @@
 #pragma once
 #include <string_view>
 #include <SFML/Graphics.hpp>
+#include <codecvt>
 
 typedef std::function<void(sf::Color bgcolor, sf::Color color, wchar_t ch)> WriteCB;
 
-bool parse_ansi(std::wstring_view codes, sf::Color default_fg, sf::Color default_bg, WriteCB write);
+class ANSIParser {
+  sf::Color $default_fg;
+  sf::Color $default_bg;
+  std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> $converter;
+
+public:
+  ANSIParser(sf::Color default_fg, sf::Color default_bg);
+
+  // disable copying
+  ANSIParser(ANSIParser& ap) = delete;
+
+  bool parse(const std::string &screen, WriteCB write);
+  bool parse(std::wstring_view codes, WriteCB write);
+};