git.r.bdr.sh - rbdr/cologne/blob - lib/cologne/formatter/simple.js

   1 'use strict';
   2
   3 let LogUtilities = require('../log_utilities');
   4
   5 /**
   6  * Simple formatter. Outputs a predefined format:
   7  * `[{{_timestamp}}][{{_levelString}}] {{_from}}: {{message}}`;
   8  *
   9  * @memberof Cologne.Formatter
  10  * @implements Cologne.IFormatter
  11  * @class Simple
  12  */
  13 let SimpleFormatter = class SimpleFormatter {
  14
  15   constructor (config) {
  16
  17     /**
  18      * Flag that tells us whether or not to use ANSI color. Defaults to
  19      * false.
  20      *
  21      * @name colorize
  22      * @instance
  23      * @memberof Cologne.Formatter.Simple
  24      * @type Boolean
  25      * @default false
  26      */
  27     this.colorize = false;
  28
  29     Object.assign(this, config || {});
  30   }
  31
  32   /**
  33    * Main entry point, it will read the incoming log object and convert
  34    * it to the output string.
  35    *
  36    * @function format
  37    * @instance
  38    * @memberof Cologne.Formatter.Simple
  39    * @param {Cologne.tCologneLog} logObjet the log to format
  40    * @return {String} the formatted object
  41    */
  42   format (logObject) {
  43     let date, levelString;
  44
  45     date = new Date(logObject._timestamp);
  46     date = date.toISOString();
  47     levelString = this._colorize(logObject._levelString, logObject._level);
  48
  49     return `[${date}][${levelString}] ${logObject._from}: ${logObject.message}`;
  50   }
  51
  52   _colorize (levelString, level) {
  53     let escapeCode, color, reset;
  54
  55     if (!this.colorize) {
  56       return levelString;
  57     }
  58
  59     escapeCode = String.fromCharCode(27);
  60     color = escapeCode + LogUtilities.getAnsiCode(LogUtilities.getLevelAnsi(level));
  61     reset = escapeCode + LogUtilities.getAnsiCode('reset');
  62
  63     return color + levelString + reset;
  64   }
  65 };
  66
  67 module.exports = SimpleFormatter;