72 lines
2.2 KiB
TypeScript
72 lines
2.2 KiB
TypeScript
import * as plugins from './smarttime.plugins';
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export class CronParser {
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public cronExpression: string;
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public get cronArray() {
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return this.cronExpression.split(' ');
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}
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constructor(cronExpressionArg: string) {
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this.cronExpression = cronExpressionArg;
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if (this.cronArray.length < 6) {
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throw new Error('CronParser needs second level accuracy');
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}
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}
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private getNextPartMatch(cronPart: string, startValue: number, moduloArg: number) {
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if (cronPart === '*') {
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return startValue;
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}
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if (cronPart.includes('/')) {
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const every = parseInt(cronPart.split('/')[1], 10);
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const findEvenMatch = (recursionStartArg: number) => {
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if (recursionStartArg % every === 0) {
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return recursionStartArg;
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} else {
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return findEvenMatch(recursionStartArg + 1);
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}
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};
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return findEvenMatch(startValue);
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}
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if (parseInt(cronPart, 10)) {
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const match = parseInt(cronPart, 10);
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return match;
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}
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}
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public getMsToNextTimeMatch() {
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const cronArray = this.cronArray;
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const secondExpression = cronArray[0];
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const minuteExpression = cronArray[1];
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const hourExpression = cronArray[2];
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const dayExpression = cronArray[3];
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const monthExpression = cronArray[4];
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const yearExpression = cronArray[5];
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const currentDate = new Date();
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const currentSecond = currentDate.getSeconds() + 1;
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const currentMinute = currentDate.getMinutes();
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const currentHour = currentDate.getHours();
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const currentDay = currentDate.getDate();
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const currentMonth = currentDate.getMonth();
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const currentYear = currentDate.getFullYear();
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const targetSecond = this.getNextPartMatch(secondExpression, currentSecond, 59);
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const targetMinute = this.getNextPartMatch(minuteExpression, currentMinute, 59);
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const targetHour = this.getNextPartMatch(hourExpression, currentHour, 23);
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const targetDay = currentDay;
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const targetMonth = currentMonth;
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const targetYear = currentYear;
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const targetDate = new Date(
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targetYear,
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targetMonth,
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targetDay,
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targetHour,
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targetMinute,
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targetSecond
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);
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const targetTime = targetDate.getTime();
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return targetTime - Date.now();
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}
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}
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