hugoWebsite/node_modules/date-fns/esm/getOverlappingDaysInIntervals/index.js

59 lines
2.4 KiB
JavaScript

import toDate from "../toDate/index.js";
import requiredArgs from "../_lib/requiredArgs/index.js";
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
*/
export default function getOverlappingDaysInIntervals(dirtyIntervalLeft, dirtyIntervalRight) {
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');
}
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);
}