piskel/js/service/keyboard/KeycodeTranslator.js

(function () {
  var specialKeys = {
    191 : "?",
    27 : "esc",
    38 : "up",
    40 : "down"
  };

  var ns = $.namespace('pskl.service.keyboard');

  ns.KeycodeTranslator= {
    toChar : function (keycode) {
      if (keycode >= 48 && keycode <= 57) {
        // key is 0-9
        return (keycode - 48) + "";
      } else if (keycode >= 65 && keycode <= 90) {
        // key is a-z, use base 36 to get the string representation
        return (keycode - 65 + 10).toString(36);
      } else {
        return specialKeys[keycode];
      }
    }
  };
})();