Update:Remove node-cron dependency

server/libs/nodeCron/convert-expression/index.js

@@ -0,0 +1,69 @@
+'use strict';
+
+// SOURCE: https://github.com/node-cron/node-cron
+// LICENSE: https://github.com/node-cron/node-cron/blob/master/LICENSE.md
+
+const monthNamesConversion = require('./month-names-conversion');
+const weekDayNamesConversion = require('./week-day-names-conversion');
+const convertAsterisksToRanges = require('./asterisk-to-range-conversion');
+const convertRanges = require('./range-conversion');
+const convertSteps = require('./step-values-conversion');
+
+module.exports = (() => {
+
+    function appendSeccondExpression(expressions) {
+        if (expressions.length === 5) {
+            return ['0'].concat(expressions);
+        }
+        return expressions;
+    }
+
+    function removeSpaces(str) {
+        return str.replace(/\s{2,}/g, ' ').trim();
+    }
+
+    // Function that takes care of normalization.
+    function normalizeIntegers(expressions) {
+        for (let i = 0; i < expressions.length; i++) {
+            const numbers = expressions[i].split(',');
+            for (let j = 0; j < numbers.length; j++) {
+                numbers[j] = parseInt(numbers[j]);
+            }
+            expressions[i] = numbers;
+        }
+        return expressions;
+    }
+
+    /*
+   * The node-cron core allows only numbers (including multiple numbers e.g 1,2).
+   * This module is going to translate the month names, week day names and ranges
+   * to integers relatives.
+   *
+   * Month names example:
+   *  - expression 0 1 1 January,Sep *
+   *  - Will be translated to 0 1 1 1,9 *
+   *
+   * Week day names example:
+   *  - expression 0 1 1 2 Monday,Sat
+   *  - Will be translated to 0 1 1 1,5 *
+   *
+   * Ranges example:
+   *  - expression 1-5 * * * *
+   *  - Will be translated to 1,2,3,4,5 * * * *
+   */
+    function interprete(expression) {
+        let expressions = removeSpaces(expression).split(' ');
+        expressions = appendSeccondExpression(expressions);
+        expressions[4] = monthNamesConversion(expressions[4]);
+        expressions[5] = weekDayNamesConversion(expressions[5]);
+        expressions = convertAsterisksToRanges(expressions);
+        expressions = convertRanges(expressions);
+        expressions = convertSteps(expressions);
+
+        expressions = normalizeIntegers(expressions);
+
+        return expressions.join(' ');
+    }
+
+    return interprete;
+})();