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File: isoweek.js
import { D, W, Y } from "./constant.js"; const isoWeekPrettyUnit = "isoweek"; export default (o, c, d) => { const getYearFirstThursday = (year, isUtc) => { const yearFirstDay = (isUtc ? d.utc : d)().year(year).startOf(Y); let addDiffDays = 4 - yearFirstDay.isoWeekday(); if (yearFirstDay.isoWeekday() > 4) { addDiffDays += 7; } return yearFirstDay.add(addDiffDays, D); }; const getCurrentWeekThursday = (ins) => ins.add(4 - ins.isoWeekday(), D); const proto = c.prototype; proto.isoWeekYear = function () { const nowWeekThursday = getCurrentWeekThursday(this); return nowWeekThursday.year(); }; proto.isoWeek = function (week) { if (!this.$utils().u(week)) { return this.add((week - this.isoWeek()) * 7, D); } const nowWeekThursday = getCurrentWeekThursday(this); const diffWeekThursday = getYearFirstThursday(this.isoWeekYear(), this.$u); return nowWeekThursday.diff(diffWeekThursday, W) + 1; }; proto.isoWeekday = function (week) { if (!this.$utils().u(week)) { return this.day(this.day() % 7 ? week : week - 7); } return this.day() || 7; }; const oldStartOf = proto.startOf; proto.startOf = function (units, startOf) { const utils = this.$utils(); const isStartOf = !utils.u(startOf) ? startOf : true; const unit = utils.p(units); if (unit === isoWeekPrettyUnit) { return isStartOf ? this.date(this.date() - (this.isoWeekday() - 1)).startOf("day") : this.date(this.date() - 1 - (this.isoWeekday() - 1) + 7).endOf("day"); } return oldStartOf.bind(this)(units, startOf); }; };