dartterm/lib/cp437.dart

typedef Cp437 = int;

bool initialized = false;
final List<String> _fromCp437 = [
  "\u0000",
  "\u0001",
  "\u0002",
  "\u0003",
  "\u0004",
  "\u0005",
  "\u0006",
  "\u0007",
  "\b",
  "\t",
  "\n",
  "\u000b",
  "\f",
  "\r",
  "\u000e",
  "\u000f",
  "\u0010",
  "\u0011",
  "\u0012",
  "\u0013",
  "\u0014",
  "\u0015",
  "\u0016",
  "\u0017",
  "\u0018",
  "\u0019",
  "\u001a",
  "\u001b",
  "\u001c",
  "\u001d",
  "\u001e",
  "\u001f",
  " ",
  "!",
  "\"",
  "#",
  "\$",
  "%",
  "&",
  "'",
  "(",
  ")",
  "*",
  "+",
  ",",
  "-",
  ".",
  "/",
  "0",
  "1",
  "2",
  "3",
  "4",
  "5",
  "6",
  "7",
  "8",
  "9",
  ":",
  ";",
  "<",
  "=",
  ">",
  "?",
  "@",
  "A",
  "B",
  "C",
  "D",
  "E",
  "F",
  "G",
  "H",
  "I",
  "J",
  "K",
  "L",
  "M",
  "N",
  "O",
  "P",
  "Q",
  "R",
  "S",
  "T",
  "U",
  "V",
  "W",
  "X",
  "Y",
  "Z",
  "[",
  "\\",
  "]",
  "^",
  "_",
  "`",
  "a",
  "b",
  "c",
  "d",
  "e",
  "f",
  "g",
  "h",
  "i",
  "j",
  "k",
  "l",
  "m",
  "n",
  "o",
  "p",
  "q",
  "r",
  "s",
  "t",
  "u",
  "v",
  "w",
  "x",
  "y",
  "z",
  "{",
  "|",
  "}",
  "~",
  "\u007f",
  "\u00c7",
  "\u00fc",
  "\u00e9",
  "\u00e2",
  "\u00e4",
  "\u00e0",
  "\u00e5",
  "\u00e7",
  "\u00ea",
  "\u00eb",
  "\u00e8",
  "\u00ef",
  "\u00ee",
  "\u00ec",
  "\u00c4",
  "\u00c5",
  "\u00c9",
  "\u00e6",
  "\u00c6",
  "\u00f4",
  "\u00f6",
  "\u00f2",
  "\u00fb",
  "\u00f9",
  "\u00ff",
  "\u00d6",
  "\u00dc",
  "\u00a2",
  "\u00a3",
  "\u00a5",
  "\u20a7",
  "\u0192",
  "\u00e1",
  "\u00ed",
  "\u00f3",
  "\u00fa",
  "\u00f1",
  "\u00d1",
  "\u00aa",
  "\u00ba",
  "\u00bf",
  "\u2310",
  "\u00ac",
  "\u00bd",
  "\u00bc",
  "\u00a1",
  "\u00ab",
  "\u00bb",
  "\u2591",
  "\u2592",
  "\u2593",
  "\u2502",
  "\u2524",
  "\u2561",
  "\u2562",
  "\u2556",
  "\u2555",
  "\u2563",
  "\u2551",
  "\u2557",
  "\u255d",
  "\u255c",
  "\u255b",
  "\u2510",
  "\u2514",
  "\u2534",
  "\u252c",
  "\u251c",
  "\u2500",
  "\u253c",
  "\u255e",
  "\u255f",
  "\u255a",
  "\u2554",
  "\u2569",
  "\u2566",
  "\u2560",
  "\u2550",
  "\u256c",
  "\u2567",
  "\u2568",
  "\u2564",
  "\u2565",
  "\u2559",
  "\u2558",
  "\u2552",
  "\u2553",
  "\u256b",
  "\u256a",
  "\u2518",
  "\u250c",
  "\u2588",
  "\u2584",
  "\u258c",
  "\u2590",
  "\u2580",
  "\u03b1",
  "\u00df",
  "\u0393",
  "\u03c0",
  "\u03a3",
  "\u03c3",
  "\u00b5",
  "\u03c4",
  "\u03a6",
  "\u0398",
  "\u03a9",
  "\u03b4",
  "\u221e",
  "\u03c6",
  "\u03b5",
  "\u2229",
  "\u2261",
  "\u00b1",
  "\u2265",
  "\u2264",
  "\u2320",
  "\u2321",
  "\u00f7",
  "\u2248",
  "\u00b0",
  "\u2219",
  "\u00b7",
  "\u221a",
  "\u207f",
  "\u00b2",
  "\u25a0",
  "\u00a0"
];
final Map<String, Cp437> _toCp437 = {};
final Map<int, Cp437> _toCp437I = {};

void _init() {
  if (initialized) {
    return;
  }

  for (final (i, c) in _fromCp437.indexed) {
    _toCp437[c] = i;
    _toCp437I[c.runes.first] = i;
  }

  initialized = true;
}

String fromCp437Char(Cp437 c) {
  _init();
  if (c < 0 || c > _fromCp437.length) {
    return "?";
  }
  return _fromCp437[c];
}

Cp437 toCp437Char(String c) {
  _init();
  var cp = _toCp437[c];
  if (cp == null) {
    return toCp437Char("?");
  }
  return cp;
}

String fromCp437String(List<Cp437> s) {
  _init();
  var out = "";
  for (final c in s) {
    out += fromCp437Char(c);
  }
  return out;
}

List<Cp437> toCp437String(String s) {
  _init();
  List<Cp437> out = [];
  for (final c in s.runes) {
    out.add(_toCp437I[c] ?? toCp437Char("?"));
  }
  return out;
}