Marc Mintel
5397309103
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60 lines
1.9 KiB
Plaintext
60 lines
1.9 KiB
Plaintext
"use strict";
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exports.setDay = setDay;
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var _index = require("./_lib/defaultOptions.cjs");
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var _index2 = require("./addDays.cjs");
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var _index3 = require("./toDate.cjs");
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/**
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* The {@link setDay} function options.
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*/
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/**
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* @name setDay
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* @category Weekday Helpers
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* @summary Set the day of the week to the given date.
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*
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* @description
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* Set the day of the week to the given date.
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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 day - The day of the week 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 day of the week set
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*
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* @example
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* // Set week day to Sunday, with the default weekStartsOn of Sunday:
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* const result = setDay(new Date(2014, 8, 1), 0)
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* //=> Sun Aug 31 2014 00:00:00
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*
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* @example
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* // Set week day to Sunday, with a weekStartsOn of Monday:
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* const result = setDay(new Date(2014, 8, 1), 0, { weekStartsOn: 1 })
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* //=> Sun Sep 07 2014 00:00:00
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*/
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function setDay(date, day, options) {
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const defaultOptions = (0, _index.getDefaultOptions)();
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const weekStartsOn =
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options?.weekStartsOn ??
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options?.locale?.options?.weekStartsOn ??
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defaultOptions.weekStartsOn ??
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defaultOptions.locale?.options?.weekStartsOn ??
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0;
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const date_ = (0, _index3.toDate)(date, options?.in);
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const currentDay = date_.getDay();
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const remainder = day % 7;
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const dayIndex = (remainder + 7) % 7;
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const delta = 7 - weekStartsOn;
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const diff =
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day < 0 || day > 6
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? day - ((currentDay + delta) % 7)
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: ((dayIndex + delta) % 7) - ((currentDay + delta) % 7);
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return (0, _index2.addDays)(date_, diff, options);
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}
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