/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

utils.block = {
  block: function (list, optional) {
    if (optional === true) {
      if (random.chance(6)) {
        return '';
      }
    }

    function go_deeper(item) {
      if (item === null || item === undefined) {
        return "";
      }
      if (typeof(item) === "function") {
        return item();
      }
      if (typeof(item) === "string") {
        return item;
      }
      if (item instanceof (Array)) {
        let s = "";
        for (let i = 0; i < item.length; i++) {
          s += go_deeper(item[i]);
        }
        return s;
      }
      return item;
    }

    let asString = "";
    for (let i = 0; i < list.length; i++) {
      asString += go_deeper(list[i]);
    }

    return asString;
  }
};