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106 lines
3.9 KiB
106 lines
3.9 KiB
"use strict"; |
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Object.defineProperty(exports, "__esModule", { |
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value: true |
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}); |
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exports.default = getOverlappingDaysInIntervals; |
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var _index = _interopRequireDefault(require("../toDate/index.js")); |
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var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js")); |
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } |
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var MILLISECONDS_IN_DAY = 24 * 60 * 60 * 1000; |
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/** |
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* @name getOverlappingDaysInIntervals |
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* @category Interval Helpers |
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* @summary Get the number of days that overlap in two time intervals |
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* |
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* @description |
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* Get the number of days that overlap in two time intervals |
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* |
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* ### v2.0.0 breaking changes: |
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* |
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* - [Changes that are common for the whole library](https://github.com/date-fns/date-fns/blob/master/docs/upgradeGuide.md#Common-Changes). |
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* |
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* - The function was renamed from `getOverlappingDaysInRanges` to `getOverlappingDaysInIntervals`. |
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* This change was made to mirror the use of the word "interval" in standard ISO 8601:2004 terminology: |
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* |
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* ``` |
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* 2.1.3 |
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* time interval |
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* part of the time axis limited by two instants |
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* ``` |
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* |
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* Also, this function now accepts an object with `start` and `end` properties |
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* instead of two arguments as an interval. |
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* This function now throws `RangeError` if the start of the interval is after its end |
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* or if any date in the interval is `Invalid Date`. |
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* |
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* ```javascript |
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* // Before v2.0.0 |
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* |
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* getOverlappingDaysInRanges( |
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* new Date(2014, 0, 10), new Date(2014, 0, 20), |
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* new Date(2014, 0, 17), new Date(2014, 0, 21) |
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* ) |
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* |
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* // v2.0.0 onward |
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* |
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* getOverlappingDaysInIntervals( |
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* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) }, |
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* { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) } |
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* ) |
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* ``` |
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* |
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* @param {Interval} intervalLeft - the first interval to compare. See [Interval]{@link docs/Interval} |
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* @param {Interval} intervalRight - the second interval to compare. See [Interval]{@link docs/Interval} |
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* @returns {Number} the number of days that overlap in two time intervals |
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* @throws {TypeError} 2 arguments required |
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* @throws {RangeError} The start of an interval cannot be after its end |
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* @throws {RangeError} Date in interval cannot be `Invalid Date` |
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* |
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* @example |
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* // For overlapping time intervals adds 1 for each started overlapping day: |
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* getOverlappingDaysInIntervals( |
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* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) }, |
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* { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) } |
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* ) |
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* //=> 3 |
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* |
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* @example |
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* // For non-overlapping time intervals returns 0: |
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* getOverlappingDaysInIntervals( |
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* { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) }, |
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* { start: new Date(2014, 0, 21), end: new Date(2014, 0, 22) } |
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* ) |
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* //=> 0 |
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*/ |
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function getOverlappingDaysInIntervals(dirtyIntervalLeft, dirtyIntervalRight) { |
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(0, _index2.default)(2, arguments); |
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var intervalLeft = dirtyIntervalLeft || {}; |
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var intervalRight = dirtyIntervalRight || {}; |
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var leftStartTime = (0, _index.default)(intervalLeft.start).getTime(); |
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var leftEndTime = (0, _index.default)(intervalLeft.end).getTime(); |
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var rightStartTime = (0, _index.default)(intervalRight.start).getTime(); |
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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` |
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if (!(leftStartTime <= leftEndTime && rightStartTime <= rightEndTime)) { |
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throw new RangeError('Invalid interval'); |
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} |
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var isOverlapping = leftStartTime < rightEndTime && rightStartTime < leftEndTime; |
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if (!isOverlapping) { |
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return 0; |
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} |
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var overlapStartDate = rightStartTime < leftStartTime ? leftStartTime : rightStartTime; |
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var overlapEndDate = rightEndTime > leftEndTime ? leftEndTime : rightEndTime; |
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var differenceInMs = overlapEndDate - overlapStartDate; |
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return Math.ceil(differenceInMs / MILLISECONDS_IN_DAY); |
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} |
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module.exports = exports.default; |