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Viewing file:     index.js (4.17 KB)      -rw-r--r--

import toDate from "../toDate/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
/**
 * @name areIntervalsOverlapping
 * @category Interval Helpers
 * @summary Is the given time interval overlapping with another time interval?
 *
 * @description
 * Is the given time interval overlapping with another time interval? Adjacent intervals do not count as overlapping.
 *
 * ### v2.0.0 breaking changes:
 *
 * - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes).
 *
 * - The function was renamed from `areRangesOverlapping` to `areIntervalsOverlapping`.
 *   This change was made to mirror the use of the word "interval" in standard ISO 8601:2004 terminology:
 *
 *   ```
 *   2.1.3
 *   time interval
 *   part of the time axis limited by two instants
 *   ```
 *
 *   Also, this function now accepts an object with `start` and `end` properties
 *   instead of two arguments as an interval.
 *   This function now throws `RangeError` if the start of the interval is after its end
 *   or if any date in the interval is `Invalid Date`.
 *
 *   ```javascript
 *   // Before v2.0.0
 *
 *   areRangesOverlapping(
 *     new Date(2014, 0, 10), new Date(2014, 0, 20),
 *     new Date(2014, 0, 17), new Date(2014, 0, 21)
 *   )
 *
 *   // v2.0.0 onward
 *
 *   areIntervalsOverlapping(
 *     { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
 *     { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) }
 *   )
 *   ```
 *
 * @param {Interval} intervalLeft - the first interval to compare. See [Interval]{@link https://date-fns.org/docs/Interval}
 * @param {Interval} intervalRight - the second interval to compare. See [Interval]{@link https://date-fns.org/docs/Interval}
 * @param {Object} [options] - the object with options
 * @param {Boolean} [options.inclusive=false] - whether the comparison is inclusive or not
 * @returns {Boolean} whether the time intervals are overlapping
 * @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:
 * areIntervalsOverlapping(
 *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
 *   { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) }
 * )
 * //=> true
 *
 * @example
 * // For non-overlapping time intervals:
 * areIntervalsOverlapping(
 *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
 *   { start: new Date(2014, 0, 21), end: new Date(2014, 0, 22) }
 * )
 * //=> false
 *
 * @example
 * // For adjacent time intervals:
 * areIntervalsOverlapping(
 *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
 *   { start: new Date(2014, 0, 20), end: new Date(2014, 0, 30) }
 * )
 * //=> false
 *
 * @example
 * // Using the inclusive option:
 * areIntervalsOverlapping(
 *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
 *   { start: new Date(2014, 0, 20), end: new Date(2014, 0, 24) }
 * )
 * //=> false
 * areIntervalsOverlapping(
 *   { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
 *   { start: new Date(2014, 0, 20), end: new Date(2014, 0, 24) },
 *   { inclusive: true }
 * )
 * //=> true
 */

export default function areIntervalsOverlapping(dirtyIntervalLeft, dirtyIntervalRight) {
  var options = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {
    inclusive: false
  };
  requiredArgs(2, arguments);
  var intervalLeft = dirtyIntervalLeft || {};
  var intervalRight = dirtyIntervalRight || {};
  var leftStartTime = toDate(intervalLeft.start).getTime();
  var leftEndTime = toDate(intervalLeft.end).getTime();
  var rightStartTime = toDate(intervalRight.start).getTime();
  var rightEndTime = toDate(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');
  }

  if (options.inclusive) {
    return leftStartTime <= rightEndTime && rightStartTime <= leftEndTime;
  }

  return leftStartTime < rightEndTime && rightStartTime < leftEndTime;
}