1. /**
  2.  * Represents a given version string in a comparable manor.
  3.  *
  4.  * @class
  5.  * @author Frank Villasenor
  6.  * @param strVersion dbVersion as a string. 1.0.0 or 1.0.0.1
  7.  * @constructor
  8.  */
  9. function dbVersion(strVersion) {
  10.   this.original = strVersion;
  11.   const parsed = strVersion.match(/(\d+)\.(\d+)\.(\d+)\.*(\d*)/);
  12.   this.debug = require('debug')('db-migration:dbVersion');
  14.   this.parsed = Object.freeze({
  15.     major: parseInt(parsed[1]),
  16.     minor: parseInt(parsed[2]),
  17.     revision: parseInt(parsed[3]),
  18.     build: parseInt(parsed[4] || 0)
  19.   });
  20.   this.debug("parsed", this.parsed);
  21. }
  23. /**
  24.  * Compares me against another dbVersion instance.
  25.  * Equal: 0
  26.  * this newer: 1
  27.  * other newer: -1
  28.  * @param other The other instance to compare against.
  29.  * @returns {number} 0=Equals; 1=this newer; -1=other newer
  30.  */
  31. dbVersion.prototype.compare = function (other) {
  32.   this.debug('other', other);
  33.   if (typeof other !== 'object' && typeof other.parsed !== 'object') throw "Invalid input";
  35.   try {
  36.     const weAreEqual = (this.parsed.major == other.parsed.major) &&
  37.       (this.parsed.minor == other.parsed.minor) &&
  38.       (this.parsed.revision == other.parsed.revision) &&
  39.       (this.parsed.build == other.parsed.build);
  41.     if (weAreEqual) return 0;
  42.     if (this.amNewer(other)) return 1;
  43.     return -1;
  44.   } catch (er) {
  45.     this.debug("Error in compare", er, parsed_version, other);
  46.     throw er;
  47.   }
  48. };
  50. /**
  51.  * Is this instance newer (greater) than the given 'other' instance
  52.  * @param other
  53.  * @returns {boolean}
  54.  */
  55. dbVersion.prototype.amNewer = function (other) {
  56.   return (this.parsed.major > other.parsed.major) ||
  57.     (this.parsed.minor > other.parsed.minor) ||
  58.     (this.parsed.revision > other.parsed.revision) ||
  59.     (this.parsed.build > other.parsed.build);
  61.   //need to handle build
  62. };
  65. module.exports = dbVersion;