Initial import from local backup (Documents-Playground/pakerpale)

node_modules/node-cron/src/convert-expression/index.js

@@ -0,0 +1,66 @@
+'use strict';
+
+var monthNamesConversion = require('./month-names-conversion');
+var weekDayNamesConversion = require('./week-day-names-conversion');
+var convertAsterisksToRanges = require('./asterisk-to-range-conversion');
+var convertRanges = require('./range-conversion');
+var 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 (var i=0; i < expressions.length; i++){
+      var numbers = expressions[i].split(',');
+      for (var 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){
+    var 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;
+})();