1 | ;
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2 |
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3 | Object.defineProperty(exports, "__esModule", {
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4 | value: true
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5 | });
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6 | exports.default = getOverlappingDaysInIntervals;
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7 |
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8 | var _index = _interopRequireDefault(require("../toDate/index.js"));
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9 |
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10 | var _index2 = _interopRequireDefault(require("../_lib/requiredArgs/index.js"));
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11 |
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12 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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13 |
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14 | var MILLISECONDS_IN_DAY = 24 * 60 * 60 * 1000;
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15 | /**
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16 | * @name getOverlappingDaysInIntervals
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17 | * @category Interval Helpers
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18 | * @summary Get the number of days that overlap in two time intervals
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19 | *
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20 | * @description
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21 | * Get the number of days that overlap in two time intervals
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22 | *
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23 | * ### v2.0.0 breaking changes:
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24 | *
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25 | * - [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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26 | *
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27 | * - The function was renamed from `getOverlappingDaysInRanges` to `getOverlappingDaysInIntervals`.
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28 | * This change was made to mirror the use of the word "interval" in standard ISO 8601:2004 terminology:
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29 | *
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30 | * ```
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31 | * 2.1.3
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32 | * time interval
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33 | * part of the time axis limited by two instants
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34 | * ```
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35 | *
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36 | * Also, this function now accepts an object with `start` and `end` properties
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37 | * instead of two arguments as an interval.
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38 | * This function now throws `RangeError` if the start of the interval is after its end
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39 | * or if any date in the interval is `Invalid Date`.
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40 | *
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41 | * ```javascript
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42 | * // Before v2.0.0
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43 | *
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44 | * getOverlappingDaysInRanges(
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45 | * new Date(2014, 0, 10), new Date(2014, 0, 20),
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46 | * new Date(2014, 0, 17), new Date(2014, 0, 21)
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47 | * )
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48 | *
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49 | * // v2.0.0 onward
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50 | *
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51 | * getOverlappingDaysInIntervals(
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52 | * { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
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53 | * { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) }
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54 | * )
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55 | * ```
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56 | *
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57 | * @param {Interval} intervalLeft - the first interval to compare. See [Interval]{@link docs/Interval}
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58 | * @param {Interval} intervalRight - the second interval to compare. See [Interval]{@link docs/Interval}
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59 | * @returns {Number} the number of days that overlap in two time intervals
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60 | * @throws {TypeError} 2 arguments required
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61 | * @throws {RangeError} The start of an interval cannot be after its end
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62 | * @throws {RangeError} Date in interval cannot be `Invalid Date`
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63 | *
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64 | * @example
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65 | * // For overlapping time intervals adds 1 for each started overlapping day:
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66 | * getOverlappingDaysInIntervals(
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67 | * { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
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68 | * { start: new Date(2014, 0, 17), end: new Date(2014, 0, 21) }
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69 | * )
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70 | * //=> 3
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71 | *
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72 | * @example
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73 | * // For non-overlapping time intervals returns 0:
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74 | * getOverlappingDaysInIntervals(
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75 | * { start: new Date(2014, 0, 10), end: new Date(2014, 0, 20) },
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76 | * { start: new Date(2014, 0, 21), end: new Date(2014, 0, 22) }
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77 | * )
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78 | * //=> 0
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79 | */
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80 |
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81 | function getOverlappingDaysInIntervals(dirtyIntervalLeft, dirtyIntervalRight) {
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82 | (0, _index2.default)(2, arguments);
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83 | var intervalLeft = dirtyIntervalLeft || {};
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84 | var intervalRight = dirtyIntervalRight || {};
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85 | var leftStartTime = (0, _index.default)(intervalLeft.start).getTime();
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86 | var leftEndTime = (0, _index.default)(intervalLeft.end).getTime();
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87 | var rightStartTime = (0, _index.default)(intervalRight.start).getTime();
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88 | 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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89 |
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90 | if (!(leftStartTime <= leftEndTime && rightStartTime <= rightEndTime)) {
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91 | throw new RangeError('Invalid interval');
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92 | }
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93 |
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94 | var isOverlapping = leftStartTime < rightEndTime && rightStartTime < leftEndTime;
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95 |
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96 | if (!isOverlapping) {
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97 | return 0;
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98 | }
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99 |
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100 | var overlapStartDate = rightStartTime < leftStartTime ? leftStartTime : rightStartTime;
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101 | var overlapEndDate = rightEndTime > leftEndTime ? leftEndTime : rightEndTime;
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102 | var differenceInMs = overlapEndDate - overlapStartDate;
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103 | return Math.ceil(differenceInMs / MILLISECONDS_IN_DAY);
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104 | }
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105 |
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106 | module.exports = exports.default; |
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