Utils.escape = (text) => {
  // https://codereview.stackexchange.com/a/126722
  var table = {
    '<': 'lt',
    '>': 'gt',
    '"': 'quot',
    '\'': 'apos',
    '&': 'amp',
    '\r': '#10',
    '\n': '#13'
  };
  
  return text.toString().replace(/[<>"'\r\n&]/g, (chr) => {
    return '&' + table[chr] + ';';
  });
};

Utils.unescape = (escapedText) => {
  var table = {
    'lt': '<',
    'gt': '>',
    'quot': '"',
    'apos': "'",
    'amp': '&',
    '#10': '\r',
    '#13': '\n'
  };
  
  return escapedText.replace(/&(#?\w+);/g, (match, entity) => {
    if (table.hasOwnProperty(entity)) {
      return table[entity];
    }
    
    return match;
  });
};

Utils.HTMLToElement = (HTMLString) => {
  let templateElement = document.createElement('template');
  templateElement.innerHTML = HTMLString.trim();
  return templateElement.content.firstChild;
};

Utils.generateElementId = (prefix='', suffix='') => {
  for (let i = 0; true; i++) {
    if (document.querySelector(`#${prefix}${i}${suffix}`) !== null) {continue;}
    return `${prefix}${i}${suffix}`;
  }
};

Utils.isObject = (object) => {
  return object !== null && typeof object === 'object' && !Array.isArray(object);
};

Utils.mergeObjectsDeep = (...objects) => {
  let mergedObject = {};
  if (objects.length === 0) {
    return mergedObject;
  }
  if (!Utils.isObject(objects[0])) {throw 'Cannot merge non-object';}
  if (objects.length === 1) {
    return Utils.mergeObjectsDeep(mergedObject, objects[0]);
  }
  if (!Utils.isObject(objects[1])) {throw 'Cannot merge non-object';}
  for (let key in objects[0]) {
    if (objects[0].hasOwnProperty(key)) {
      if (objects[1].hasOwnProperty(key)) {
        if (Utils.isObject(objects[0][key]) && Utils.isObject(objects[1][key])) {
          mergedObject[key] = Utils.mergeObjectsDeep(objects[0][key], objects[1][key]);
        } else {
          mergedObject[key] = objects[1][key];
        }
      } else {
        mergedObject[key] = objects[0][key];
      }
    }
  }
  for (let key in objects[1]) {
    if (objects[1].hasOwnProperty(key)) {
      if (!objects[0].hasOwnProperty(key)) {
        mergedObject[key] = objects[1][key];
      }
    }
  }
  if (objects.length === 2) {
    return mergedObject;
  }
  return Utils.mergeObjectsDeep(mergedObject, ...objects.slice(2));
};