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605 lines
19 KiB
TypeScript
605 lines
19 KiB
TypeScript
// Loaded from https://unpkg.com/luxon@1.25.0/src/interval.js
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import DateTime, { friendlyDateTime } from "./datetime.js";
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import Duration, { friendlyDuration } from "./duration.js";
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import Settings from "./settings.js";
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import { InvalidArgumentError, InvalidIntervalError } from "./errors.js";
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import Invalid from "./impl/invalid.js";
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const INVALID = "Invalid Interval";
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// checks if the start is equal to or before the end
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function validateStartEnd(start, end) {
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if (!start || !start.isValid) {
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return Interval.invalid("missing or invalid start");
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} else if (!end || !end.isValid) {
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return Interval.invalid("missing or invalid end");
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} else if (end < start) {
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return Interval.invalid(
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"end before start",
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`The end of an interval must be after its start, but you had start=${start.toISO()} and end=${end.toISO()}`
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);
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} else {
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return null;
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}
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}
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/**
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* 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.
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*
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* Here is a brief overview of the most commonly used methods and getters in Interval:
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*
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* * **Creation** To create an Interval, use {@link fromDateTimes}, {@link after}, {@link before}, or {@link fromISO}.
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* * **Accessors** Use {@link start} and {@link end} to get the start and end.
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* * **Interrogation** To analyze the Interval, use {@link count}, {@link length}, {@link hasSame}, {@link contains}, {@link isAfter}, or {@link isBefore}.
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* * **Transformation** To create other Intervals out of this one, use {@link set}, {@link splitAt}, {@link splitBy}, {@link divideEqually}, {@link merge}, {@link xor}, {@link union}, {@link intersection}, or {@link difference}.
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* * **Comparison** To compare this Interval to another one, use {@link equals}, {@link overlaps}, {@link abutsStart}, {@link abutsEnd}, {@link engulfs}.
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* * **Output** To convert the Interval into other representations, see {@link toString}, {@link toISO}, {@link toISODate}, {@link toISOTime}, {@link toFormat}, and {@link toDuration}.
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*/
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export default class Interval {
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/**
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* @private
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*/
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constructor(config) {
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/**
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* @access private
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*/
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this.s = config.start;
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/**
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* @access private
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*/
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this.e = config.end;
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/**
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* @access private
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*/
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this.invalid = config.invalid || null;
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/**
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* @access private
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*/
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this.isLuxonInterval = true;
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}
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/**
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* Create an invalid Interval.
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* @param {string} reason - simple string of why this Interval is invalid. Should not contain parameters or anything else data-dependent
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* @param {string} [explanation=null] - longer explanation, may include parameters and other useful debugging information
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* @return {Interval}
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*/
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static invalid(reason, explanation = null) {
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if (!reason) {
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throw new InvalidArgumentError("need to specify a reason the Interval is invalid");
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}
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const invalid = reason instanceof Invalid ? reason : new Invalid(reason, explanation);
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if (Settings.throwOnInvalid) {
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throw new InvalidIntervalError(invalid);
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} else {
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return new Interval({ invalid });
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}
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}
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/**
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* Create an Interval from a start DateTime and an end DateTime. Inclusive of the start but not the end.
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* @param {DateTime|Date|Object} start
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* @param {DateTime|Date|Object} end
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* @return {Interval}
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*/
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static fromDateTimes(start, end) {
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const builtStart = friendlyDateTime(start),
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builtEnd = friendlyDateTime(end);
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const validateError = validateStartEnd(builtStart, builtEnd);
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if (validateError == null) {
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return new Interval({
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start: builtStart,
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end: builtEnd
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});
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} else {
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return validateError;
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}
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}
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/**
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* Create an Interval from a start DateTime and a Duration to extend to.
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* @param {DateTime|Date|Object} start
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* @param {Duration|Object|number} duration - the length of the Interval.
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* @return {Interval}
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*/
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static after(start, duration) {
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const dur = friendlyDuration(duration),
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dt = friendlyDateTime(start);
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return Interval.fromDateTimes(dt, dt.plus(dur));
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}
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/**
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* Create an Interval from an end DateTime and a Duration to extend backwards to.
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* @param {DateTime|Date|Object} end
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* @param {Duration|Object|number} duration - the length of the Interval.
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* @return {Interval}
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*/
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static before(end, duration) {
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const dur = friendlyDuration(duration),
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dt = friendlyDateTime(end);
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return Interval.fromDateTimes(dt.minus(dur), dt);
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}
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/**
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* Create an Interval from an ISO 8601 string.
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* Accepts `<start>/<end>`, `<start>/<duration>`, and `<duration>/<end>` formats.
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* @param {string} text - the ISO string to parse
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* @param {Object} [opts] - options to pass {@link DateTime.fromISO} and optionally {@link Duration.fromISO}
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* @see https://en.wikipedia.org/wiki/ISO_8601#Time_intervals
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* @return {Interval}
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*/
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static fromISO(text, opts) {
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const [s, e] = (text || "").split("/", 2);
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if (s && e) {
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let start, startIsValid;
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try {
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start = DateTime.fromISO(s, opts);
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startIsValid = start.isValid;
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} catch (e) {
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startIsValid = false;
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}
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let end, endIsValid;
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try {
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end = DateTime.fromISO(e, opts);
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endIsValid = end.isValid;
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} catch (e) {
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endIsValid = false;
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}
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if (startIsValid && endIsValid) {
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return Interval.fromDateTimes(start, end);
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}
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if (startIsValid) {
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const dur = Duration.fromISO(e, opts);
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if (dur.isValid) {
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return Interval.after(start, dur);
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}
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} else if (endIsValid) {
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const dur = Duration.fromISO(s, opts);
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if (dur.isValid) {
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return Interval.before(end, dur);
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}
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}
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}
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return Interval.invalid("unparsable", `the input "${text}" can't be parsed as ISO 8601`);
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}
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/**
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* Check if an object is an Interval. Works across context boundaries
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* @param {object} o
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* @return {boolean}
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*/
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static isInterval(o) {
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return (o && o.isLuxonInterval) || false;
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}
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/**
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* Returns the start of the Interval
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* @type {DateTime}
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*/
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get start() {
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return this.isValid ? this.s : null;
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}
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/**
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* Returns the end of the Interval
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* @type {DateTime}
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*/
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get end() {
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return this.isValid ? this.e : null;
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}
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/**
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* Returns whether this Interval's end is at least its start, meaning that the Interval isn't 'backwards'.
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* @type {boolean}
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*/
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get isValid() {
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return this.invalidReason === null;
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}
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/**
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* Returns an error code if this Interval is invalid, or null if the Interval is valid
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* @type {string}
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*/
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get invalidReason() {
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return this.invalid ? this.invalid.reason : null;
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}
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/**
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* Returns an explanation of why this Interval became invalid, or null if the Interval is valid
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* @type {string}
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*/
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get invalidExplanation() {
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return this.invalid ? this.invalid.explanation : null;
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}
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/**
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* Returns the length of the Interval in the specified unit.
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* @param {string} unit - the unit (such as 'hours' or 'days') to return the length in.
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* @return {number}
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*/
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length(unit = "milliseconds") {
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return this.isValid ? this.toDuration(...[unit]).get(unit) : NaN;
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}
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/**
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* Returns the count of minutes, hours, days, months, or years included in the Interval, even in part.
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* Unlike {@link length} this counts sections of the calendar, not periods of time, e.g. specifying 'day'
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* asks 'what dates are included in this interval?', not 'how many days long is this interval?'
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* @param {string} [unit='milliseconds'] - the unit of time to count.
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* @return {number}
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*/
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count(unit = "milliseconds") {
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if (!this.isValid) return NaN;
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const start = this.start.startOf(unit),
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end = this.end.startOf(unit);
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return Math.floor(end.diff(start, unit).get(unit)) + 1;
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}
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/**
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* Returns whether this Interval's start and end are both in the same unit of time
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* @param {string} unit - the unit of time to check sameness on
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* @return {boolean}
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*/
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hasSame(unit) {
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return this.isValid ? this.isEmpty() || this.e.minus(1).hasSame(this.s, unit) : false;
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}
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/**
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* Return whether this Interval has the same start and end DateTimes.
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* @return {boolean}
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*/
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isEmpty() {
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return this.s.valueOf() === this.e.valueOf();
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}
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/**
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* Return whether this Interval's start is after the specified DateTime.
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* @param {DateTime} dateTime
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* @return {boolean}
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*/
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isAfter(dateTime) {
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if (!this.isValid) return false;
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return this.s > dateTime;
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}
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/**
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* Return whether this Interval's end is before the specified DateTime.
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* @param {DateTime} dateTime
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* @return {boolean}
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*/
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isBefore(dateTime) {
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if (!this.isValid) return false;
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return this.e <= dateTime;
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}
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/**
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* Return whether this Interval contains the specified DateTime.
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* @param {DateTime} dateTime
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* @return {boolean}
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*/
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contains(dateTime) {
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if (!this.isValid) return false;
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return this.s <= dateTime && this.e > dateTime;
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}
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/**
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* "Sets" the start and/or end dates. Returns a newly-constructed Interval.
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* @param {Object} values - the values to set
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* @param {DateTime} values.start - the starting DateTime
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* @param {DateTime} values.end - the ending DateTime
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* @return {Interval}
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*/
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set({ start, end } = {}) {
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if (!this.isValid) return this;
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return Interval.fromDateTimes(start || this.s, end || this.e);
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}
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/**
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* Split this Interval at each of the specified DateTimes
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* @param {...[DateTime]} dateTimes - the unit of time to count.
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* @return {[Interval]}
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*/
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splitAt(...dateTimes) {
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if (!this.isValid) return [];
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const sorted = dateTimes
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.map(friendlyDateTime)
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.filter(d => this.contains(d))
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.sort(),
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results = [];
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let { s } = this,
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i = 0;
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while (s < this.e) {
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const added = sorted[i] || this.e,
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next = +added > +this.e ? this.e : added;
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results.push(Interval.fromDateTimes(s, next));
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s = next;
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i += 1;
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}
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return results;
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}
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/**
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* Split this Interval into smaller Intervals, each of the specified length.
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* Left over time is grouped into a smaller interval
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* @param {Duration|Object|number} duration - The length of each resulting interval.
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* @return {[Interval]}
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*/
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splitBy(duration) {
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const dur = friendlyDuration(duration);
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if (!this.isValid || !dur.isValid || dur.as("milliseconds") === 0) {
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return [];
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}
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let { s } = this,
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added,
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next;
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const results = [];
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while (s < this.e) {
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added = s.plus(dur);
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next = +added > +this.e ? this.e : added;
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results.push(Interval.fromDateTimes(s, next));
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s = next;
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}
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return results;
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}
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/**
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* Split this Interval into the specified number of smaller intervals.
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* @param {number} numberOfParts - The number of Intervals to divide the Interval into.
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* @return {[Interval]}
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*/
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divideEqually(numberOfParts) {
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if (!this.isValid) return [];
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return this.splitBy(this.length() / numberOfParts).slice(0, numberOfParts);
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}
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/**
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* Return whether this Interval overlaps with the specified Interval
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* @param {Interval} other
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* @return {boolean}
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*/
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overlaps(other) {
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return this.e > other.s && this.s < other.e;
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}
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/**
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* Return whether this Interval's end is adjacent to the specified Interval's start.
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* @param {Interval} other
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* @return {boolean}
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*/
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abutsStart(other) {
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if (!this.isValid) return false;
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return +this.e === +other.s;
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}
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/**
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* Return whether this Interval's start is adjacent to the specified Interval's end.
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* @param {Interval} other
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* @return {boolean}
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*/
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abutsEnd(other) {
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if (!this.isValid) return false;
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return +other.e === +this.s;
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}
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/**
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* Return whether this Interval engulfs the start and end of the specified Interval.
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* @param {Interval} other
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* @return {boolean}
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*/
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engulfs(other) {
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if (!this.isValid) return false;
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return this.s <= other.s && this.e >= other.e;
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}
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/**
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* Return whether this Interval has the same start and end as the specified Interval.
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* @param {Interval} other
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* @return {boolean}
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*/
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equals(other) {
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if (!this.isValid || !other.isValid) {
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return false;
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}
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return this.s.equals(other.s) && this.e.equals(other.e);
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}
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/**
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* Return an Interval representing the intersection of this Interval and the specified Interval.
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* Specifically, the resulting Interval has the maximum start time and the minimum end time of the two Intervals.
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* Returns null if the intersection is empty, meaning, the intervals don't intersect.
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* @param {Interval} other
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* @return {Interval}
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*/
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intersection(other) {
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if (!this.isValid) return this;
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const s = this.s > other.s ? this.s : other.s,
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e = this.e < other.e ? this.e : other.e;
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if (s > e) {
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return null;
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} else {
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return Interval.fromDateTimes(s, e);
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}
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}
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/**
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* Return an Interval representing the union of this Interval and the specified Interval.
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* Specifically, the resulting Interval has the minimum start time and the maximum end time of the two Intervals.
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* @param {Interval} other
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* @return {Interval}
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*/
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union(other) {
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if (!this.isValid) return this;
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const s = this.s < other.s ? this.s : other.s,
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e = this.e > other.e ? this.e : other.e;
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return Interval.fromDateTimes(s, e);
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}
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/**
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* Merge an array of Intervals into a equivalent minimal set of Intervals.
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* Combines overlapping and adjacent Intervals.
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* @param {[Interval]} intervals
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* @return {[Interval]}
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*/
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static merge(intervals) {
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const [found, final] = intervals.sort((a, b) => a.s - b.s).reduce(
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([sofar, current], item) => {
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if (!current) {
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return [sofar, item];
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} else if (current.overlaps(item) || current.abutsStart(item)) {
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return [sofar, current.union(item)];
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} else {
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return [sofar.concat([current]), item];
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}
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},
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[[], null]
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);
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if (final) {
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found.push(final);
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}
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return found;
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}
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/**
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* Return an array of Intervals representing the spans of time that only appear in one of the specified Intervals.
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* @param {[Interval]} intervals
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* @return {[Interval]}
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*/
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static xor(intervals) {
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let start = null,
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currentCount = 0;
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const results = [],
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ends = intervals.map(i => [{ time: i.s, type: "s" }, { time: i.e, type: "e" }]),
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flattened = Array.prototype.concat(...ends),
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arr = flattened.sort((a, b) => a.time - b.time);
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for (const i of arr) {
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currentCount += i.type === "s" ? 1 : -1;
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if (currentCount === 1) {
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start = i.time;
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} else {
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if (start && +start !== +i.time) {
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results.push(Interval.fromDateTimes(start, i.time));
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}
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start = null;
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}
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}
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return Interval.merge(results);
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}
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/**
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* Return an Interval representing the span of time in this Interval that doesn't overlap with any of the specified Intervals.
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* @param {...Interval} intervals
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* @return {[Interval]}
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*/
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difference(...intervals) {
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return Interval.xor([this].concat(intervals))
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.map(i => this.intersection(i))
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.filter(i => i && !i.isEmpty());
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}
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/**
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* Returns a string representation of this Interval appropriate for debugging.
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* @return {string}
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*/
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toString() {
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if (!this.isValid) return INVALID;
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return `[${this.s.toISO()} – ${this.e.toISO()})`;
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}
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/**
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* Returns an ISO 8601-compliant string representation of this Interval.
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* @see https://en.wikipedia.org/wiki/ISO_8601#Time_intervals
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* @param {Object} opts - The same options as {@link DateTime.toISO}
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* @return {string}
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*/
|
||
toISO(opts) {
|
||
if (!this.isValid) return INVALID;
|
||
return `${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)}/${this.e.toISOTime(opts)}`;
|
||
}
|
||
|
||
/**
|
||
* Returns a string representation of this Interval formatted according to the specified format string.
|
||
* @param {string} dateFormat - the format string. This string formats the start and end time. See {@link DateTime.toFormat} for details.
|
||
* @param {Object} opts - options
|
||
* @param {string} [opts.separator = ' – '] - a separator to place between the start and end representations
|
||
* @return {string}
|
||
*/
|
||
toFormat(dateFormat, { separator = " – " } = {}) {
|
||
if (!this.isValid) return INVALID;
|
||
return `${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));
|
||
}
|
||
}
|