fix(core): update

ts/smarttime.classes.cronparser.ts

@@ -0,0 +1,71 @@
+import * as plugins from './smarttime.plugins';
+
+export class CronParser {
+  public cronExpression: string;
+  public get cronArray() {
+    return this.cronExpression.split(' ');
+  }
+  constructor(cronExpressionArg: string) {
+    this.cronExpression = cronExpressionArg;
+    if (this.cronArray.length < 6) {
+      throw new Error('CronParser needs second level accuracy');
+    }
+  }
+
+  private getNextPartMatch(cronPart: string, startValue: number, moduloArg: number) {
+    if (cronPart === '*') {
+      return startValue;
+    }
+    if (cronPart.includes('/')) {
+      const every = parseInt(cronPart.split('/')[1], 10);
+      const findEvenMatch = (recursionStartArg: number) => {
+        if (recursionStartArg % every === 0) {
+          return recursionStartArg;
+        } else {
+          return findEvenMatch(recursionStartArg + 1);
+        }
+      };
+      return findEvenMatch(startValue);
+    }
+    if (parseInt(cronPart, 10)) {
+      const match = parseInt(cronPart, 10);
+      return match;
+    }
+  }
+
+  public getMsToNextTimeMatch() {
+    const cronArray = this.cronArray;
+    const secondExpression = cronArray[0];
+    const minuteExpression = cronArray[1];
+    const hourExpression = cronArray[2];
+    const dayExpression = cronArray[3];
+    const monthExpression = cronArray[4];
+    const yearExpression = cronArray[5];
+
+    const currentDate = new Date();
+    const currentSecond = currentDate.getSeconds() + 1;
+    const currentMinute = currentDate.getMinutes();
+    const currentHour = currentDate.getHours();
+    const currentDay = currentDate.getDate();
+    const currentMonth = currentDate.getMonth();
+    const currentYear = currentDate.getFullYear();
+
+    const targetSecond = this.getNextPartMatch(secondExpression, currentSecond, 59);
+    const targetMinute = this.getNextPartMatch(minuteExpression, currentMinute, 59);
+    const targetHour = this.getNextPartMatch(hourExpression, currentHour, 23);
+    const targetDay = currentDay;
+    const targetMonth = currentMonth;
+    const targetYear = currentYear;
+
+    const targetDate = new Date(
+      targetYear,
+      targetMonth,
+      targetDay,
+      targetHour,
+      targetMinute,
+      targetSecond
+    );
+    const targetTime = targetDate.getTime();
+    return targetTime - Date.now();
+  }
+}