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Viewing file:     index.js (2.74 KB)      -rw-r--r--

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = getOverlappingDaysInIntervals;

var _index = _interopRequireDefault(require("../toDate/index.js"));

var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var MILLISECONDS_IN_DAY = 24 * 60 * 60 * 1000;
/**
 * @name getOverlappingDaysInIntervals
 * @category Interval Helpers
 * @summary Get the number of days that overlap in two time intervals
 *
 * @description
 * Get the number of days that overlap in two time intervals
 *
 * @param {Interval} intervalLeft - the first interval to compare. See [Interval]{@link docs/Interval}
 * @param {Interval} intervalRight - the second interval to compare. See [Interval]{@link docs/Interval}
 * @returns {Number} the number of days that overlap in two time intervals
 * @throws {TypeError} 2 arguments required
 * @throws {RangeError} The start of an interval cannot be after its end
 * @throws {RangeError} Date in interval cannot be `Invalid Date`
 *
 * @example
 * // For overlapping time intervals adds 1 for each started overlapping day:
 * getOverlappingDaysInIntervals(
 *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
 *   { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) }
 * )
 * //=> 3
 *
 * @example
 * // For non-overlapping time intervals returns 0:
 * getOverlappingDaysInIntervals(
 *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
 *   { start: new Date(2014, 0, 21), end: new Date(2014, 0, 22) }
 * )
 * //=> 0
 */

function getOverlappingDaysInIntervals(dirtyIntervalLeft, dirtyIntervalRight) {
  (0, _index2.default)(2, arguments);
  var intervalLeft = dirtyIntervalLeft || {};
  var intervalRight = dirtyIntervalRight || {};
  var leftStartTime = (0, _index.default)(intervalLeft.start).getTime();
  var leftEndTime = (0, _index.default)(intervalLeft.end).getTime();
  var rightStartTime = (0, _index.default)(intervalRight.start).getTime();
  var rightEndTime = (0, _index.default)(intervalRight.end).getTime(); // Throw an exception if start date is after end date or if any date is `Invalid Date`

  if (!(leftStartTime <= leftEndTime && rightStartTime <= rightEndTime)) {
    throw new RangeError('Invalid interval');
  }

  var isOverlapping = leftStartTime < rightEndTime && rightStartTime < leftEndTime;

  if (!isOverlapping) {
    return 0;
  }

  var overlapStartDate = rightStartTime < leftStartTime ? leftStartTime : rightStartTime;
  var overlapEndDate = rightEndTime > leftEndTime ? leftEndTime : rightEndTime;
  var differenceInMs = overlapEndDate - overlapStartDate;
  return Math.ceil(differenceInMs / MILLISECONDS_IN_DAY);
}

module.exports = exports.default;