@js-joda/extra
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additional date-time classes that complement those in js-joda
297 lines (278 loc) • 11.3 kB
JavaScript
/**
* @copyright (c) 2015-present, Philipp Thürwächter & Pattrick Hüper & Michał Sobkiewicz
* @copyright (c) 2007-present, Stephen Colebourne & Michael Nascimento Santos
* @license BSD-3-Clause (see LICENSE in the root directory of this source tree)
*/
import { requireNonNull } from './assert';
import { ChronoField, ChronoUnit, DateTimeException, DateTimeParseException, IsoFields, ParsePosition, TemporalAdjuster, UnsupportedTemporalTypeException } from '@js-joda/core';
import { _ as jodaInternal } from '@js-joda/core';
const MathUtil = jodaInternal.MathUtil;
/**
* Additional utilities for working with temporal classes.
*
* This includes:
* - adjusters that ignore Saturday/Sunday weekends
* - conversion between `TimeUnit` and `ChronoUnit`
* - converting an amount to another unit
*
*/
export class Temporals {
//-------------------------------------------------------------------------
/**
* Returns an adjuster that returns the next working day, ignoring Saturday and Sunday.
*
* Some territories have weekends that do not consist of Saturday and Sunday.
* No implementation is supplied to support this, however an adjuster
* can be easily written to do so.
*
* @return {TemporalAdjuster} the next working day adjuster, not null
*/
static nextWorkingDay() {
return Adjuster.NEXT_WORKING;
}
/**
* Returns an adjuster that returns the next working day or same day if already working day, ignoring Saturday and Sunday.
*
* Some territories have weekends that do not consist of Saturday and Sunday.
* No implementation is supplied to support this, however an adjuster
* can be easily written to do so.
*
* @return {TemporalAdjuster} the next working day or same adjuster, not null
*/
static nextWorkingDayOrSame() {
return Adjuster.NEXT_WORKING_OR_SAME;
}
/**
* Returns an adjuster that returns the previous working day, ignoring Saturday and Sunday.
*
* Some territories have weekends that do not consist of Saturday and Sunday.
* No implementation is supplied to support this, however an adjuster
* can be easily written to do so.
*
* @return {TemporalAdjuster} the previous working day adjuster, not null
*/
static previousWorkingDay() {
return Adjuster.PREVIOUS_WORKING;
}
/**
* Returns an adjuster that returns the previous working day or same day if already working day, ignoring Saturday and Sunday.
*
* Some territories have weekends that do not consist of Saturday and Sunday.
* No implementation is supplied to support this, however an adjuster
* can be easily written to do so.
*
* @return {TemporalAdjuster} the previous working day or same adjuster, not null
*/
static previousWorkingDayOrSame() {
return Adjuster.PREVIOUS_WORKING_OR_SAME;
}
//-------------------------------------------------------------------------
/**
* Parses the text using one of the formatters.
*
* This will try each formatter in turn, attempting to fully parse the specified text.
* The temporal query is typically a method reference to a `from(TemporalAccessor)` method.
* For example:
* ```
* LocalDateTime dt = Temporals.parseFirstMatching(str, LocalDateTime.FROM, fm1, fm2, fm3);
* ```
* If the parse completes without reading the entire length of the text,
* or a problem occurs during parsing or merging, then an exception is thrown.
*
* @param {string} text the text to parse, not null
* @param {TemporalQuery} query the query defining the type to parse to, not null
* @param {DateTimeFormatter[]} formatters the formatters to try, not null
* @return {*} the parsed date-time, not null
* @throws {DateTimeParseException} if unable to parse the requested result
*/
static parseFirstMatching(text, query, ...formatters) {
requireNonNull(text, 'text');
requireNonNull(query, 'query');
requireNonNull(formatters, 'formatters');
if (formatters.length === 0) {
throw new DateTimeParseException('No formatters specified', text, 0);
}
if (formatters.length === 1) {
return formatters[0].parse(text, query);
}
for (const formatter of formatters) {
try {
const pp = new ParsePosition(0);
formatter.parseUnresolved(text, pp);
const len = text.length;
if (pp.getErrorIndex() === -1 && pp.getIndex() === len) {
return formatter.parse(text, query);
}
} catch (ignored) {
// should not happen, but ignore if it does
}
}
throw new DateTimeParseException(`Text '${text}' could not be parsed`, text, 0);
}
//-------------------------------------------------------------------------
/**
* Converts an amount from one unit to another.
*
* This works on the units in `ChronoUnit` and `IsoFields`.
* The `DAYS` and `WEEKS` units are handled as exact multiple of 24 hours.
* The `ERAS` and `FOREVER` units are not supported.
*
* @param {long} amount the input amount in terms of the `fromUnit`
* @param {TemporalUnit} fromUnit the unit to convert from, not null
* @param {TemporalUnit} toUnit the unit to convert to, not null
* @return {long[]} the conversion array,
* element 0 is the signed whole number,
* element 1 is the signed remainder in terms of the input unit,
* not null
* @throws DateTimeException if the units cannot be converted
* @throws UnsupportedTemporalTypeException if the units are not supported
* @throws ArithmeticException if numeric overflow occurs
*/
static convertAmount(amount, fromUnit, toUnit) {
requireNonNull(fromUnit, 'fromUnit');
requireNonNull(toUnit, 'toUnit');
Temporals._validateUnit(fromUnit);
Temporals._validateUnit(toUnit);
if (fromUnit === toUnit) {
return [amount, 0];
}
// precise-based
if (Temporals._isPrecise(fromUnit) && Temporals._isPrecise(toUnit)) {
const fromNanos = fromUnit.duration().toNanos();
const toNanos = toUnit.duration().toNanos();
if (fromNanos > toNanos) {
const multiple = MathUtil.intDiv(fromNanos, toNanos);
return [MathUtil.safeMultiply(amount, multiple), 0];
} else {
const multiple = MathUtil.intDiv(toNanos, fromNanos);
return [MathUtil.intDiv(amount, multiple), MathUtil.intMod(amount, multiple)];
}
}
// month-based
const fromMonthFactor = Temporals._monthMonthFactor(fromUnit, fromUnit, toUnit);
const toMonthFactor = Temporals._monthMonthFactor(toUnit, fromUnit, toUnit);
if (fromMonthFactor > toMonthFactor) {
const multiple = MathUtil.intDiv(fromMonthFactor, toMonthFactor);
return [MathUtil.safeMultiply(amount, multiple), 0];
} else {
const multiple = MathUtil.intDiv(toMonthFactor, fromMonthFactor);
return [MathUtil.intDiv(amount, multiple), MathUtil.intMod(amount, multiple)];
}
}
/**
*
* @param {TemporalUnit} unit
* @private
*/
static _validateUnit(unit) {
if (unit instanceof ChronoUnit) {
if (unit === ChronoUnit.ERAS || unit === ChronoUnit.FOREVER) {
throw new UnsupportedTemporalTypeException(`Unsupported TemporalUnit: ${unit}`);
}
} else if (unit !== IsoFields.QUARTER_YEARS) {
throw new UnsupportedTemporalTypeException(`Unsupported TemporalUnit: ${unit}`);
}
}
/**
*
* @param {TemporalUnit} unit
* @return {boolean}
* @private
*/
static _isPrecise(unit) {
return unit instanceof ChronoUnit && unit.compareTo(ChronoUnit.WEEKS) <= 0;
}
/**
*
* @param {TemporalUnit} unit
* @param {TemporalUnit} fromUnit
* @param {TemporalUnit} toUnit
* @return {int}
* @private
*/
static _monthMonthFactor(unit, fromUnit, toUnit) {
if (unit instanceof ChronoUnit) {
switch (unit) {
case ChronoUnit.MONTHS:
return 1;
case ChronoUnit.YEARS:
return 12;
case ChronoUnit.DECADES:
return 120;
case ChronoUnit.CENTURIES:
return 1200;
case ChronoUnit.MILLENNIA:
return 12000;
default:
throw new DateTimeException(`Unable to convert between units: ${fromUnit} to ${toUnit}`);
}
}
return 3; // quarters
}
/**
* Restricted constructor.
*
* @private
*/
constructor() {
}
}
const Adjuster = {};
export function _init() {
/** Next working day adjuster. */
Adjuster.NEXT_WORKING = new class extends TemporalAdjuster {
adjustInto(temporal) {
const dow = temporal.get(ChronoField.DAY_OF_WEEK);
switch (dow) {
case 6: // Saturday
return temporal.plus(2, ChronoUnit.DAYS);
case 5: // Friday
return temporal.plus(3, ChronoUnit.DAYS);
default:
return temporal.plus(1, ChronoUnit.DAYS);
}
}
};
/** Previous working day adjuster. */
Adjuster.PREVIOUS_WORKING = new class extends TemporalAdjuster {
adjustInto(temporal) {
const dow = temporal.get(ChronoField.DAY_OF_WEEK);
switch (dow) {
case 1: // Monday
return temporal.minus(3, ChronoUnit.DAYS);
case 7: // Sunday
return temporal.minus(2, ChronoUnit.DAYS);
default:
return temporal.minus(1, ChronoUnit.DAYS);
}
}
};
/** Next working day or same adjuster. */
Adjuster.NEXT_WORKING_OR_SAME = new class extends TemporalAdjuster {
adjustInto(temporal) {
const dow = temporal.get(ChronoField.DAY_OF_WEEK);
switch (dow) {
case 6: // Saturday
return temporal.plus(2, ChronoUnit.DAYS);
case 7: // Sunday
return temporal.plus(1, ChronoUnit.DAYS);
default:
return temporal;
}
}
};
/** Previous working day or same adjuster. */
Adjuster.PREVIOUS_WORKING_OR_SAME = new class extends TemporalAdjuster {
adjustInto(temporal) {
const dow = temporal.get(ChronoField.DAY_OF_WEEK);
switch (dow) {
case 6: //Saturday
return temporal.minus(1, ChronoUnit.DAYS);
case 7: // Sunday
return temporal.minus(2, ChronoUnit.DAYS);
default:
return temporal;
}
}
};
}