Press n or j to go to the next uncovered block, b, p or k for the previous block.
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/**
* @param {string} value
* @returns {string|Number}
*/
function toNum(value) {
return (/^\d+$/.test(value)) ? Number(value) : value;
}
class CronRule {
/**
* @param {string} rule
*/
constructor(rule) {
this.items = rule?.split?.(' ', 5).map(toNum);
if (this.items?.length !== 5) {
throw new Error(`failed to parse Cron rule: ${rule}`);
}
}
get minute() {
return this.items[0];
}
set minute(value) {
this.items[0] = value;
}
get hour() {
return this.items[1];
}
set hour(value) {
this.items[1] = value;
}
get dayOfMonth() {
return this.items[2];
}
set dayOfMonth(value) {
this.items[2] = value;
}
get month() {
return this.items[3];
}
set month(value) {
this.items[3] = value;
}
get dayOfWeek() {
return this.items[4];
}
set dayOfWeek(value) {
this.items[4] = value;
}
/**
* @returns {string}
*/
toRule() {
return `${this.minute} ${this.hour} ${this.dayOfMonth} ${this.month} ${this.dayOfWeek}`;
}
/**
* @param {boolean} [strict=false]
* @returns {CronRule}
*/
// eslint-disable-next-line complexity
normalize(strict = false) {
if (typeof this.minute === 'number' && this.minute >= 60) {
if (typeof this.hour === 'number') {
this.hour += Math.trunc(this.minute / 60);
}
else if (strict) {
throw new Error(`failed to normalize ${this.toRule()}`);
}
this.minute %= 60;
}
if (typeof this.hour === 'number' && this.hour >= 24) {
if (typeof this.dayOfMonth === 'number') {
this.dayOfMonth += Math.trunc(this.hour / 24);
}
else if (typeof this.dayOfWeek === 'number') {
this.dayOfWeek += Math.trunc(this.hour / 24);
}
else if (strict) {
throw new Error(`failed to normalize ${this.toRule()}`);
}
this.hour %= 24;
}
if (typeof this.dayOfMonth === 'number' && this.dayOfMonth > 31) {
this.dayOfMonth = (this.dayOfMonth % 31) + 1;
}
if (typeof this.month === 'number' && this.month > 12) {
this.month = (this.month % 12) + 1;
}
if (typeof this.dayOfWeek === 'number' && this.dayOfWeek >= 7) {
this.dayOfWeek %= 7;
}
return this;
}
/**
* @param {CronRule} rule
* @param {boolean} strict silently discard errors
* @returns {CronRule}
*/
increment(rule, strict = false) {
for (let idx = 0; idx < this.items.length; ++idx) {
if (typeof (rule?.items?.[idx]) !== 'number') {
continue;
}
else if (typeof this.items[idx] === 'number') {
// @ts-ignore
this.items[idx] += rule.items[idx];
}
else if (strict && rule.items[idx] !== 0) {
throw new Error(`can't add ${rule?.toRule()} to ${this.toRule()}`);
}
}
this.normalize(strict);
return this;
}
}
export default CronRule;
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