visiting-hours/lib/Timezone.js

An advanced, feature rich, optimised and tiny visiting-hours library.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.Timezone = void 0;

function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

function _iterableToArrayLimit(arr, i) { if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return; var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }

function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

var Timezone = /*#__PURE__*/function () {
  function Timezone() {
    _classCallCheck(this, Timezone);
  }

  _createClass(Timezone, null, [{
    key: "getDateTimeFormat",
    value: function getDateTimeFormat(timeZone) {
      if (!Timezone.formattersCache[timeZone]) {
        Timezone.formattersCache[timeZone] = new Intl.DateTimeFormat('en-US', {
          hour12: false,
          timeZone: timeZone,
          year: 'numeric',
          month: '2-digit',
          day: '2-digit',
          hour: '2-digit',
          minute: '2-digit',
          second: '2-digit'
        });
      }

      return Timezone.formattersCache[timeZone];
    }
  }, {
    key: "partsOffset",
    value: function partsOffset(dtf, date) {
      return dtf.formatToParts(date).reduce(function (acc, _ref) {
        var type = _ref.type,
            value = _ref.value;

        if (type !== 'literal') {
          acc[type] = +value;
        }

        return acc;
      }, {});
    }
  }, {
    key: "utcToZonedTime",
    value: function utcToZonedTime(date, timeZone) {
      var utcDate = new Date(date.getUTCFullYear(), date.getUTCMonth(), date.getUTCDate(), date.getUTCHours(), date.getUTCMinutes(), date.getUTCSeconds(), date.getUTCMilliseconds());
      var dtf = Timezone.getDateTimeFormat(timeZone);

      var _Timezone$partsOffset = Timezone.partsOffset(dtf, date),
          year = _Timezone$partsOffset.year,
          month = _Timezone$partsOffset.month,
          day = _Timezone$partsOffset.day,
          hour = _Timezone$partsOffset.hour,
          minute = _Timezone$partsOffset.minute,
          second = _Timezone$partsOffset.second;

      var asUTC = Date.UTC(year, month - 1, day, hour, minute, second, 0);
      var timestampWithMsZeroed = date.getTime() - date.getTime() % 1000;
      var offsetMilliseconds = -(asUTC - timestampWithMsZeroed);
      return offsetMilliseconds ? new Date(utcDate.getTime() + -offsetMilliseconds) : utcDate;
    }
  }, {
    key: "fromTimeValues",
    value: function fromTimeValues(hours, minutes, zone) {
      var now = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : new Date();
      var zoned = zone ? Timezone.utcToZonedTime(now, zone) : new Date(now);
      var diff = now.getTime() - zoned.getTime();
      zoned.setHours(hours + (zoned.getHours() > hours ? 24 : 0));
      zoned.setMinutes(minutes);
      zoned.setSeconds(0);
      zoned.setMilliseconds(diff);
      return zoned;
    }
  }, {
    key: "fromTimeString",
    value: function fromTimeString(time, zone) {
      var now = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : new Date();

      var _time$split$map = time.split(':').map(Number),
          _time$split$map2 = _slicedToArray(_time$split$map, 2),
          h = _time$split$map2[0],
          m = _time$split$map2[1];

      return Timezone.fromTimeValues(h, m, zone, now);
    }
  }]);

  return Timezone;
}();

exports.Timezone = Timezone;

_defineProperty(Timezone, "formattersCache", {});