mirror of
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290 lines
7.1 KiB
TypeScript
290 lines
7.1 KiB
TypeScript
// Loaded from https://unpkg.com/luxon@1.25.0/src/impl/util.js
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/*
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This is just a junk drawer, containing anything used across multiple classes.
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Because Luxon is small(ish), this should stay small and we won't worry about splitting
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it up into, say, parsingUtil.js and basicUtil.js and so on. But they are divided up by feature area.
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*/
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import { InvalidArgumentError } from "../errors.js";
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/**
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* @private
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*/
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// TYPES
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export function isUndefined(o) {
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return typeof o === "undefined";
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}
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export function isNumber(o) {
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return typeof o === "number";
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}
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export function isInteger(o) {
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return typeof o === "number" && o % 1 === 0;
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}
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export function isString(o) {
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return typeof o === "string";
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}
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export function isDate(o) {
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return Object.prototype.toString.call(o) === "[object Date]";
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}
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// CAPABILITIES
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export function hasIntl() {
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try {
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return typeof Intl !== "undefined" && Intl.DateTimeFormat;
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} catch (e) {
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return false;
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}
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}
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export function hasFormatToParts() {
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return !isUndefined(Intl.DateTimeFormat.prototype.formatToParts);
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}
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export function hasRelative() {
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try {
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return typeof Intl !== "undefined" && !!Intl.RelativeTimeFormat;
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} catch (e) {
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return false;
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}
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}
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// OBJECTS AND ARRAYS
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export function maybeArray(thing) {
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return Array.isArray(thing) ? thing : [thing];
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}
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export function bestBy(arr, by, compare) {
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if (arr.length === 0) {
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return undefined;
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}
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return arr.reduce((best, next) => {
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const pair = [by(next), next];
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if (!best) {
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return pair;
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} else if (compare(best[0], pair[0]) === best[0]) {
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return best;
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} else {
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return pair;
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}
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}, null)[1];
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}
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export function pick(obj, keys) {
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return keys.reduce((a, k) => {
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a[k] = obj[k];
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return a;
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}, {});
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}
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export function hasOwnProperty(obj, prop) {
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return Object.prototype.hasOwnProperty.call(obj, prop);
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}
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// NUMBERS AND STRINGS
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export function integerBetween(thing, bottom, top) {
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return isInteger(thing) && thing >= bottom && thing <= top;
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}
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// x % n but takes the sign of n instead of x
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export function floorMod(x, n) {
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return x - n * Math.floor(x / n);
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}
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export function padStart(input, n = 2) {
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if (input.toString().length < n) {
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return ("0".repeat(n) + input).slice(-n);
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} else {
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return input.toString();
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}
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}
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export function parseInteger(string) {
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if (isUndefined(string) || string === null || string === "") {
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return undefined;
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} else {
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return parseInt(string, 10);
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}
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}
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export function parseMillis(fraction) {
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// Return undefined (instead of 0) in these cases, where fraction is not set
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if (isUndefined(fraction) || fraction === null || fraction === "") {
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return undefined;
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} else {
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const f = parseFloat("0." + fraction) * 1000;
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return Math.floor(f);
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}
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}
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export function roundTo(number, digits, towardZero = false) {
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const factor = 10 ** digits,
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rounder = towardZero ? Math.trunc : Math.round;
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return rounder(number * factor) / factor;
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}
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// DATE BASICS
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export function isLeapYear(year) {
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return year % 4 === 0 && (year % 100 !== 0 || year % 400 === 0);
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}
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export function daysInYear(year) {
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return isLeapYear(year) ? 366 : 365;
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}
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export function daysInMonth(year, month) {
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const modMonth = floorMod(month - 1, 12) + 1,
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modYear = year + (month - modMonth) / 12;
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if (modMonth === 2) {
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return isLeapYear(modYear) ? 29 : 28;
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} else {
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return [31, null, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][modMonth - 1];
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}
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}
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// covert a calendar object to a local timestamp (epoch, but with the offset baked in)
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export function objToLocalTS(obj) {
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let d = Date.UTC(
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obj.year,
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obj.month - 1,
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obj.day,
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obj.hour,
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obj.minute,
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obj.second,
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obj.millisecond
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);
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// for legacy reasons, years between 0 and 99 are interpreted as 19XX; revert that
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if (obj.year < 100 && obj.year >= 0) {
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d = new Date(d);
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d.setUTCFullYear(d.getUTCFullYear() - 1900);
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}
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return +d;
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}
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export function weeksInWeekYear(weekYear) {
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const p1 =
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(weekYear +
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Math.floor(weekYear / 4) -
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Math.floor(weekYear / 100) +
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Math.floor(weekYear / 400)) %
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7,
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last = weekYear - 1,
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p2 = (last + Math.floor(last / 4) - Math.floor(last / 100) + Math.floor(last / 400)) % 7;
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return p1 === 4 || p2 === 3 ? 53 : 52;
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}
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export function untruncateYear(year) {
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if (year > 99) {
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return year;
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} else return year > 60 ? 1900 + year : 2000 + year;
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}
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// PARSING
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export function parseZoneInfo(ts, offsetFormat, locale, timeZone = null) {
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const date = new Date(ts),
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intlOpts = {
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hour12: false,
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year: "numeric",
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month: "2-digit",
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day: "2-digit",
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hour: "2-digit",
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minute: "2-digit"
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};
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if (timeZone) {
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intlOpts.timeZone = timeZone;
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}
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const modified = Object.assign({ timeZoneName: offsetFormat }, intlOpts),
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intl = hasIntl();
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if (intl && hasFormatToParts()) {
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const parsed = new Intl.DateTimeFormat(locale, modified)
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.formatToParts(date)
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.find(m => m.type.toLowerCase() === "timezonename");
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return parsed ? parsed.value : null;
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} else if (intl) {
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// this probably doesn't work for all locales
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const without = new Intl.DateTimeFormat(locale, intlOpts).format(date),
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included = new Intl.DateTimeFormat(locale, modified).format(date),
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diffed = included.substring(without.length),
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trimmed = diffed.replace(/^[, \u200e]+/, "");
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return trimmed;
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} else {
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return null;
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}
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}
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// signedOffset('-5', '30') -> -330
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export function signedOffset(offHourStr, offMinuteStr) {
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let offHour = parseInt(offHourStr, 10);
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// don't || this because we want to preserve -0
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if (Number.isNaN(offHour)) {
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offHour = 0;
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}
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const offMin = parseInt(offMinuteStr, 10) || 0,
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offMinSigned = offHour < 0 || Object.is(offHour, -0) ? -offMin : offMin;
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return offHour * 60 + offMinSigned;
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}
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// COERCION
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export function asNumber(value) {
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const numericValue = Number(value);
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if (typeof value === "boolean" || value === "" || Number.isNaN(numericValue))
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throw new InvalidArgumentError(`Invalid unit value ${value}`);
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return numericValue;
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}
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export function normalizeObject(obj, normalizer, nonUnitKeys) {
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const normalized = {};
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for (const u in obj) {
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if (hasOwnProperty(obj, u)) {
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if (nonUnitKeys.indexOf(u) >= 0) continue;
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const v = obj[u];
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if (v === undefined || v === null) continue;
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normalized[normalizer(u)] = asNumber(v);
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}
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}
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return normalized;
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}
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export function formatOffset(offset, format) {
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const hours = Math.trunc(Math.abs(offset / 60)),
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minutes = Math.trunc(Math.abs(offset % 60)),
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sign = offset >= 0 ? "+" : "-";
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switch (format) {
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case "short":
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return `${sign}${padStart(hours, 2)}:${padStart(minutes, 2)}`;
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case "narrow":
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return `${sign}${hours}${minutes > 0 ? `:${minutes}` : ""}`;
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case "techie":
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return `${sign}${padStart(hours, 2)}${padStart(minutes, 2)}`;
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default:
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throw new RangeError(`Value format ${format} is out of range for property format`);
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}
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}
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export function timeObject(obj) {
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return pick(obj, ["hour", "minute", "second", "millisecond"]);
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}
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export const ianaRegex = /[A-Za-z_+-]{1,256}(:?\/[A-Za-z_+-]{1,256}(\/[A-Za-z_+-]{1,256})?)?/;
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