75 lines
2.8 KiB
JavaScript
75 lines
2.8 KiB
JavaScript
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"use strict";
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exports.setWeekYear = setWeekYear;
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var _index = require("./_lib/defaultOptions.cjs");
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var _index2 = require("./constructFrom.cjs");
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var _index3 = require("./differenceInCalendarDays.cjs");
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var _index4 = require("./startOfWeekYear.cjs");
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var _index5 = require("./toDate.cjs");
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/**
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* The {@link setWeekYear} function options.
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*/
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/**
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* @name setWeekYear
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* @category Week-Numbering Year Helpers
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* @summary Set the local week-numbering year to the given date.
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*
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* @description
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* Set the local week-numbering year to the given date,
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* saving the week number and the weekday number.
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* The exact calculation depends on the values of
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* `options.weekStartsOn` (which is the index of the first day of the week)
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* and `options.firstWeekContainsDate` (which is the day of January, which is always in
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* the first week of the week-numbering year)
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*
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* Week numbering: https://en.wikipedia.org/wiki/Week#The_ISO_week_date_system
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*
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* @typeParam DateType - The `Date` type, the function operates on. Gets inferred from passed arguments. Allows to use extensions like [`UTCDate`](https://github.com/date-fns/utc).
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* @typeParam ResultDate - The result `Date` type, it is the type returned from the context function if it is passed, or inferred from the arguments.
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*
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* @param date - The date to be changed
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* @param weekYear - The local week-numbering year of the new date
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* @param options - An object with options
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*
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* @returns The new date with the local week-numbering year set
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*
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* @example
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* // Set the local week-numbering year 2004 to 2 January 2010 with default options:
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* const result = setWeekYear(new Date(2010, 0, 2), 2004)
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* //=> Sat Jan 03 2004 00:00:00
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*
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* @example
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* // Set the local week-numbering year 2004 to 2 January 2010,
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* // if Monday is the first day of week
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* // and 4 January is always in the first week of the year:
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* const result = setWeekYear(new Date(2010, 0, 2), 2004, {
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* weekStartsOn: 1,
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* firstWeekContainsDate: 4
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* })
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* //=> Sat Jan 01 2005 00:00:00
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*/
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function setWeekYear(date, weekYear, options) {
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const defaultOptions = (0, _index.getDefaultOptions)();
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const firstWeekContainsDate =
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options?.firstWeekContainsDate ??
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options?.locale?.options?.firstWeekContainsDate ??
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defaultOptions.firstWeekContainsDate ??
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defaultOptions.locale?.options?.firstWeekContainsDate ??
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1;
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const diff = (0, _index3.differenceInCalendarDays)(
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(0, _index5.toDate)(date, options?.in),
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(0, _index4.startOfWeekYear)(date, options),
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options,
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);
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const firstWeek = (0, _index2.constructFrom)(options?.in || date, 0);
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firstWeek.setFullYear(weekYear, 0, firstWeekContainsDate);
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firstWeek.setHours(0, 0, 0, 0);
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const date_ = (0, _index4.startOfWeekYear)(firstWeek, options);
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date_.setDate(date_.getDate() + diff);
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return date_;
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}
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