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import DateTime, { friendlyDateTime } from "./datetime.js";
import Duration from "./duration.js";
import Settings from "./settings.js";
import { InvalidArgumentError, InvalidIntervalError } from "./errors.js";
import Invalid from "./impl/invalid.js";
import Formatter from "./impl/formatter.js";
import * as Formats from "./impl/formats.js";
const INVALID = "Invalid Interval";
// checks if the start is equal to or before the end
function validateStartEnd(start, end) {
if (!start || !start.isValid) {
return Interval.invalid("missing or invalid start");
} else if (!end || !end.isValid) {
return Interval.invalid("missing or invalid end");
} else if (end < start) {
return Interval.invalid(
"end before start",
`The end of an interval must be after its start, but you had start=${start.toISO()} and end=${end.toISO()}`
);
} else {
return null;
}
}
/**
* An Interval object represents a half-open interval of time, where each endpoint is a {@link DateTime}. Conceptually, it's a container for those two endpoints, accompanied by methods for creating, parsing, interrogating, comparing, transforming, and formatting them.
*
* Here is a brief overview of the most commonly used methods and getters in Interval:
*
* * **Creation** To create an Interval, use {@link Interval.fromDateTimes}, {@link Interval.after}, {@link Interval.before}, or {@link Interval.fromISO}.
* * **Accessors** Use {@link Interval#start} and {@link Interval#end} to get the start and end.
* * **Interrogation** To analyze the Interval, use {@link Interval#count}, {@link Interval#length}, {@link Interval#hasSame}, {@link Interval#contains}, {@link Interval#isAfter}, or {@link Interval#isBefore}.
* * **Transformation** To create other Intervals out of this one, use {@link Interval#set}, {@link Interval#splitAt}, {@link Interval#splitBy}, {@link Interval#divideEqually}, {@link Interval.merge}, {@link Interval.xor}, {@link Interval#union}, {@link Interval#intersection}, or {@link Interval#difference}.
* * **Comparison** To compare this Interval to another one, use {@link Interval#equals}, {@link Interval#overlaps}, {@link Interval#abutsStart}, {@link Interval#abutsEnd}, {@link Interval#engulfs}
* * **Output** To convert the Interval into other representations, see {@link Interval#toString}, {@link Interval#toLocaleString}, {@link Interval#toISO}, {@link Interval#toISODate}, {@link Interval#toISOTime}, {@link Interval#toFormat}, and {@link Interval#toDuration}.
*/
export default class Interval {
/**
* @private
*/
constructor(config) {
/**
* @access private
*/
this.s = config.start;
/**
* @access private
*/
this.e = config.end;
/**
* @access private
*/
this.invalid = config.invalid || null;
/**
* @access private
*/
this.isLuxonInterval = true;
}
/**
* Create an invalid Interval.
* @param {string} reason - simple string of why this Interval is invalid. Should not contain parameters or anything else data-dependent
* @param {string} [explanation=null] - longer explanation, may include parameters and other useful debugging information
* @return {Interval}
*/
static invalid(reason, explanation = null) {
if (!reason) {
throw new InvalidArgumentError("need to specify a reason the Interval is invalid");
}
const invalid = reason instanceof Invalid ? reason : new Invalid(reason, explanation);
if (Settings.throwOnInvalid) {
throw new InvalidIntervalError(invalid);
} else {
return new Interval({ invalid });
}
}
/**
* Create an Interval from a start DateTime and an end DateTime. Inclusive of the start but not the end.
* @param {DateTime|Date|Object} start
* @param {DateTime|Date|Object} end
* @return {Interval}
*/
static fromDateTimes(start, end) {
const builtStart = friendlyDateTime(start),
builtEnd = friendlyDateTime(end);
const validateError = validateStartEnd(builtStart, builtEnd);
if (validateError == null) {
return new Interval({
start: builtStart,
end: builtEnd,
});
} else {
return validateError;
}
}
/**
* Create an Interval from a start DateTime and a Duration to extend to.
* @param {DateTime|Date|Object} start
* @param {Duration|Object|number} duration - the length of the Interval.
* @return {Interval}
*/
static after(start, duration) {
const dur = Duration.fromDurationLike(duration),
dt = friendlyDateTime(start);
return Interval.fromDateTimes(dt, dt.plus(dur));
}
/**
* Create an Interval from an end DateTime and a Duration to extend backwards to.
* @param {DateTime|Date|Object} end
* @param {Duration|Object|number} duration - the length of the Interval.
* @return {Interval}
*/
static before(end, duration) {
const dur = Duration.fromDurationLike(duration),
dt = friendlyDateTime(end);
return Interval.fromDateTimes(dt.minus(dur), dt);
}
/**
* Create an Interval from an ISO 8601 string.
* Accepts `<start>/<end>`, `<start>/<duration>`, and `<duration>/<end>` formats.
* @param {string} text - the ISO string to parse
* @param {Object} [opts] - options to pass {@link DateTime#fromISO} and optionally {@link Duration#fromISO}
* @see https://en.wikipedia.org/wiki/ISO_8601#Time_intervals
* @return {Interval}
*/
static fromISO(text, opts) {
const [s, e] = (text || "").split("/", 2);
if (s && e) {
let start, startIsValid;
try {
start = DateTime.fromISO(s, opts);
startIsValid = start.isValid;
} catch (e) {
startIsValid = false;
}
let end, endIsValid;
try {
end = DateTime.fromISO(e, opts);
endIsValid = end.isValid;
} catch (e) {
endIsValid = false;
}
if (startIsValid && endIsValid) {
return Interval.fromDateTimes(start, end);
}
if (startIsValid) {
const dur = Duration.fromISO(e, opts);
if (dur.isValid) {
return Interval.after(start, dur);
}
} else if (endIsValid) {
const dur = Duration.fromISO(s, opts);
if (dur.isValid) {
return Interval.before(end, dur);
}
}
}
return Interval.invalid("unparsable", `the input "${text}" can't be parsed as ISO 8601`);
}
/**
* Check if an object is an Interval. Works across context boundaries
* @param {object} o
* @return {boolean}
*/
static isInterval(o) {
return (o && o.isLuxonInterval) || false;
}
/**
* Returns the start of the Interval
* @type {DateTime}
*/
get start() {
return this.isValid ? this.s : null;
}
/**
* Returns the end of the Interval
* @type {DateTime}
*/
get end() {
return this.isValid ? this.e : null;
}
/**
* Returns whether this Interval's end is at least its start, meaning that the Interval isn't 'backwards'.
* @type {boolean}
*/
get isValid() {
return this.invalidReason === null;
}
/**
* Returns an error code if this Interval is invalid, or null if the Interval is valid
* @type {string}
*/
get invalidReason() {
return this.invalid ? this.invalid.reason : null;
}
/**
* Returns an explanation of why this Interval became invalid, or null if the Interval is valid
* @type {string}
*/
get invalidExplanation() {
return this.invalid ? this.invalid.explanation : null;
}
/**
* Returns the length of the Interval in the specified unit.
* @param {string} unit - the unit (such as 'hours' or 'days') to return the length in.
* @return {number}
*/
length(unit = "milliseconds") {
return this.isValid ? this.toDuration(...[unit]).get(unit) : NaN;
}
/**
* Returns the count of minutes, hours, days, months, or years included in the Interval, even in part.
* Unlike {@link Interval#length} this counts sections of the calendar, not periods of time, e.g. specifying 'day'
* asks 'what dates are included in this interval?', not 'how many days long is this interval?'
* @param {string} [unit='milliseconds'] - the unit of time to count.
* @param {Object} opts - options
* @param {boolean} [opts.useLocaleWeeks=false] - If true, use weeks based on the locale, i.e. use the locale-dependent start of the week; this operation will always use the locale of the start DateTime
* @return {number}
*/
count(unit = "milliseconds", opts) {
if (!this.isValid) return NaN;
const start = this.start.startOf(unit, opts);
let end;
if (opts?.useLocaleWeeks) {
end = this.end.reconfigure({ locale: start.locale });
} else {
end = this.end;
}
end = end.startOf(unit, opts);
return Math.floor(end.diff(start, unit).get(unit)) + (end.valueOf() !== this.end.valueOf());
}
/**
* Returns whether this Interval's start and end are both in the same unit of time
* @param {string} unit - the unit of time to check sameness on
* @return {boolean}
*/
hasSame(unit) {
return this.isValid ? this.isEmpty() || this.e.minus(1).hasSame(this.s, unit) : false;
}
/**
* Return whether this Interval has the same start and end DateTimes.
* @return {boolean}
*/
isEmpty() {
return this.s.valueOf() === this.e.valueOf();
}
/**
* Return whether this Interval's start is after the specified DateTime.
* @param {DateTime} dateTime
* @return {boolean}
*/
isAfter(dateTime) {
if (!this.isValid) return false;
return this.s > dateTime;
}
/**
* Return whether this Interval's end is before the specified DateTime.
* @param {DateTime} dateTime
* @return {boolean}
*/
isBefore(dateTime) {
if (!this.isValid) return false;
return this.e <= dateTime;
}
/**
* Return whether this Interval contains the specified DateTime.
* @param {DateTime} dateTime
* @return {boolean}
*/
contains(dateTime) {
if (!this.isValid) return false;
return this.s <= dateTime && this.e > dateTime;
}
/**
* "Sets" the start and/or end dates. Returns a newly-constructed Interval.
* @param {Object} values - the values to set
* @param {DateTime} values.start - the starting DateTime
* @param {DateTime} values.end - the ending DateTime
* @return {Interval}
*/
set({ start, end } = {}) {
if (!this.isValid) return this;
return Interval.fromDateTimes(start || this.s, end || this.e);
}
/**
* Split this Interval at each of the specified DateTimes
* @param {...DateTime} dateTimes - the unit of time to count.
* @return {Array}
*/
splitAt(...dateTimes) {
if (!this.isValid) return [];
const sorted = dateTimes
.map(friendlyDateTime)
.filter((d) => this.contains(d))
.sort((a, b) => a.toMillis() - b.toMillis()),
results = [];
let { s } = this,
i = 0;
while (s < this.e) {
const added = sorted[i] || this.e,
next = +added > +this.e ? this.e : added;
results.push(Interval.fromDateTimes(s, next));
s = next;
i += 1;
}
return results;
}
/**
* Split this Interval into smaller Intervals, each of the specified length.
* Left over time is grouped into a smaller interval
* @param {Duration|Object|number} duration - The length of each resulting interval.
* @return {Array}
*/
splitBy(duration) {
const dur = Duration.fromDurationLike(duration);
if (!this.isValid || !dur.isValid || dur.as("milliseconds") === 0) {
return [];
}
let { s } = this,
idx = 1,
next;
const results = [];
while (s < this.e) {
const added = this.start.plus(dur.mapUnits((x) => x * idx));
next = +added > +this.e ? this.e : added;
results.push(Interval.fromDateTimes(s, next));
s = next;
idx += 1;
}
return results;
}
/**
* Split this Interval into the specified number of smaller intervals.
* @param {number} numberOfParts - The number of Intervals to divide the Interval into.
* @return {Array}
*/
divideEqually(numberOfParts) {
if (!this.isValid) return [];
return this.splitBy(this.length() / numberOfParts).slice(0, numberOfParts);
}
/**
* Return whether this Interval overlaps with the specified Interval
* @param {Interval} other
* @return {boolean}
*/
overlaps(other) {
return this.e > other.s && this.s < other.e;
}
/**
* Return whether this Interval's end is adjacent to the specified Interval's start.
* @param {Interval} other
* @return {boolean}
*/
abutsStart(other) {
if (!this.isValid) return false;
return +this.e === +other.s;
}
/**
* Return whether this Interval's start is adjacent to the specified Interval's end.
* @param {Interval} other
* @return {boolean}
*/
abutsEnd(other) {
if (!this.isValid) return false;
return +other.e === +this.s;
}
/**
* Return whether this Interval engulfs the start and end of the specified Interval.
* @param {Interval} other
* @return {boolean}
*/
engulfs(other) {
if (!this.isValid) return false;
return this.s <= other.s && this.e >= other.e;
}
/**
* Return whether this Interval has the same start and end as the specified Interval.
* @param {Interval} other
* @return {boolean}
*/
equals(other) {
if (!this.isValid || !other.isValid) {
return false;
}
return this.s.equals(other.s) && this.e.equals(other.e);
}
/**
* Return an Interval representing the intersection of this Interval and the specified Interval.
* Specifically, the resulting Interval has the maximum start time and the minimum end time of the two Intervals.
* Returns null if the intersection is empty, meaning, the intervals don't intersect.
* @param {Interval} other
* @return {Interval}
*/
intersection(other) {
if (!this.isValid) return this;
const s = this.s > other.s ? this.s : other.s,
e = this.e < other.e ? this.e : other.e;
if (s >= e) {
return null;
} else {
return Interval.fromDateTimes(s, e);
}
}
/**
* Return an Interval representing the union of this Interval and the specified Interval.
* Specifically, the resulting Interval has the minimum start time and the maximum end time of the two Intervals.
* @param {Interval} other
* @return {Interval}
*/
union(other) {
if (!this.isValid) return this;
const s = this.s < other.s ? this.s : other.s,
e = this.e > other.e ? this.e : other.e;
return Interval.fromDateTimes(s, e);
}
/**
* Merge an array of Intervals into a equivalent minimal set of Intervals.
* Combines overlapping and adjacent Intervals.
* @param {Array} intervals
* @return {Array}
*/
static merge(intervals) {
const [found, final] = intervals
.sort((a, b) => a.s - b.s)
.reduce(
([sofar, current], item) => {
if (!current) {
return [sofar, item];
} else if (current.overlaps(item) || current.abutsStart(item)) {
return [sofar, current.union(item)];
} else {
return [sofar.concat([current]), item];
}
},
[[], null]
);
if (final) {
found.push(final);
}
return found;
}
/**
* Return an array of Intervals representing the spans of time that only appear in one of the specified Intervals.
* @param {Array} intervals
* @return {Array}
*/
static xor(intervals) {
let start = null,
currentCount = 0;
const results = [],
ends = intervals.map((i) => [
{ time: i.s, type: "s" },
{ time: i.e, type: "e" },
]),
flattened = Array.prototype.concat(...ends),
arr = flattened.sort((a, b) => a.time - b.time);
for (const i of arr) {
currentCount += i.type === "s" ? 1 : -1;
if (currentCount === 1) {
start = i.time;
} else {
if (start && +start !== +i.time) {
results.push(Interval.fromDateTimes(start, i.time));
}
start = null;
}
}
return Interval.merge(results);
}
/**
* Return an Interval representing the span of time in this Interval that doesn't overlap with any of the specified Intervals.
* @param {...Interval} intervals
* @return {Array}
*/
difference(...intervals) {
return Interval.xor([this].concat(intervals))
.map((i) => this.intersection(i))
.filter((i) => i && !i.isEmpty());
}
/**
* Returns a string representation of this Interval appropriate for debugging.
* @return {string}
*/
toString() {
if (!this.isValid) return INVALID;
return `[${this.s.toISO()} – ${this.e.toISO()})`;
}
/**
* Returns a string representation of this Interval appropriate for the REPL.
* @return {string}
*/
[Symbol.for("nodejs.util.inspect.custom")]() {
if (this.isValid) {
return `Interval { start: ${this.s.toISO()}, end: ${this.e.toISO()} }`;
} else {
return `Interval { Invalid, reason: ${this.invalidReason} }`;
}
}
/**
* Returns a localized string representing this Interval. Accepts the same options as the
* Intl.DateTimeFormat constructor and any presets defined by Luxon, such as
* {@link DateTime.DATE_FULL} or {@link DateTime.TIME_SIMPLE}. The exact behavior of this method
* is browser-specific, but in general it will return an appropriate representation of the
* Interval in the assigned locale. Defaults to the system's locale if no locale has been
* specified.
* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/DateTimeFormat
* @param {Object} [formatOpts=DateTime.DATE_SHORT] - Either a DateTime preset or
* Intl.DateTimeFormat constructor options.
* @param {Object} opts - Options to override the configuration of the start DateTime.
* @example Interval.fromISO('2022-11-07T09:00Z/2022-11-08T09:00Z').toLocaleString(); //=> 11/7/2022 – 11/8/2022
* @example Interval.fromISO('2022-11-07T09:00Z/2022-11-08T09:00Z').toLocaleString(DateTime.DATE_FULL); //=> November 7 – 8, 2022
* @example Interval.fromISO('2022-11-07T09:00Z/2022-11-08T09:00Z').toLocaleString(DateTime.DATE_FULL, { locale: 'fr-FR' }); //=> 7–8 novembre 2022
* @example Interval.fromISO('2022-11-07T17:00Z/2022-11-07T19:00Z').toLocaleString(DateTime.TIME_SIMPLE); //=> 6:00 – 8:00 PM
* @example Interval.fromISO('2022-11-07T17:00Z/2022-11-07T19:00Z').toLocaleString({ weekday: 'short', month: 'short', day: '2-digit', hour: '2-digit', minute: '2-digit' }); //=> Mon, Nov 07, 6:00 – 8:00 p
* @return {string}
*/
toLocaleString(formatOpts = Formats.DATE_SHORT, opts = {}) {
return this.isValid
? Formatter.create(this.s.loc.clone(opts), formatOpts).formatInterval(this)
: INVALID;
}
/**
* Returns an ISO 8601-compliant string representation of this Interval.
* @see https://en.wikipedia.org/wiki/ISO_8601#Time_intervals
* @param {Object} opts - The same options as {@link DateTime#toISO}
* @return {string}
*/
toISO(opts) {
if (!this.isValid) return INVALID;
return `${this.s.toISO(opts)}/${this.e.toISO(opts)}`;
}
/**
* Returns an ISO 8601-compliant string representation of date of this Interval.
* The time components are ignored.
* @see https://en.wikipedia.org/wiki/ISO_8601#Time_intervals
* @return {string}
*/
toISODate() {
if (!this.isValid) return INVALID;
return `${this.s.toISODate()}/${this.e.toISODate()}`;
}
/**
* Returns an ISO 8601-compliant string representation of time of this Interval.
* The date components are ignored.
* @see https://en.wikipedia.org/wiki/ISO_8601#Time_intervals
* @param {Object} opts - The same options as {@link DateTime#toISO}
* @return {string}
*/
toISOTime(opts) {
if (!this.isValid) return INVALID;
return `${this.s.toISOTime(opts)}/${this.e.toISOTime(opts)}`;
}
/**
* Returns a string representation of this Interval formatted according to the specified format
* string. **You may not want this.** See {@link Interval#toLocaleString} for a more flexible
* formatting tool.
* @param {string} dateFormat - The format string. This string formats the start and end time.
* See {@link DateTime#toFormat} for details.
* @param {Object} opts - Options.
* @param {string} [opts.separator = ' – '] - A separator to place between the start and end
* representations.
* @return {string}
*/
toFormat(dateFormat, { separator = " – " } = {}) {
if (!this.isValid) return INVALID;
return `${this.s.toFormat(dateFormat)}${separator}${this.e.toFormat(dateFormat)}`;
}
/**
* Return a Duration representing the time spanned by this interval.
* @param {string|string[]} [unit=['milliseconds']] - the unit or units (such as 'hours' or 'days') to include in the duration.
* @param {Object} opts - options that affect the creation of the Duration
* @param {string} [opts.conversionAccuracy='casual'] - the conversion system to use
* @example Interval.fromDateTimes(dt1, dt2).toDuration().toObject() //=> { milliseconds: 88489257 }
* @example Interval.fromDateTimes(dt1, dt2).toDuration('days').toObject() //=> { days: 1.0241812152777778 }
* @example Interval.fromDateTimes(dt1, dt2).toDuration(['hours', 'minutes']).toObject() //=> { hours: 24, minutes: 34.82095 }
* @example Interval.fromDateTimes(dt1, dt2).toDuration(['hours', 'minutes', 'seconds']).toObject() //=> { hours: 24, minutes: 34, seconds: 49.257 }
* @example Interval.fromDateTimes(dt1, dt2).toDuration('seconds').toObject() //=> { seconds: 88489.257 }
* @return {Duration}
*/
toDuration(unit, opts) {
if (!this.isValid) {
return Duration.invalid(this.invalidReason);
}
return this.e.diff(this.s, unit, opts);
}
/**
* Run mapFn on the interval start and end, returning a new Interval from the resulting DateTimes
* @param {function} mapFn
* @return {Interval}
* @example Interval.fromDateTimes(dt1, dt2).mapEndpoints(endpoint => endpoint.toUTC())
* @example Interval.fromDateTimes(dt1, dt2).mapEndpoints(endpoint => endpoint.plus({ hours: 2 }))
*/
mapEndpoints(mapFn) {
return Interval.fromDateTimes(mapFn(this.s), mapFn(this.e));
}
}