mermaid/src/logger.js

/**
 * #logger
 * logger = require('logger').create()
 * logger.info("blah")
 * => [2011-3-3T20:24:4.810 info (5021)] blah
 * logger.debug("boom")
 * =>
 * logger.level = Logger.levels.debug
 * logger.debug(function() { return "booom" })
 * => [2011-3-3T20:24:4.810 error (5021)] booom
 */

const LEVELS = {
    debug: 1,
    info: 2,
    warn: 3,
    error: 4,
    fatal: 5,
    default: 5
};

var defaultLevel = LEVELS.error;

// exports.setLogLevel = function (level) {
//     defaultLevel = level;
// };

function formatTime(timestamp) {
    var hh = timestamp.getUTCHours();
    var mm = timestamp.getUTCMinutes();
    var ss = timestamp.getSeconds();
    var ms = timestamp.getMilliseconds();
    // If you were building a timestamp instead of a duration, you would uncomment the following line to get 12-hour (not 24) time
    // if (hh > 12) {hh = hh % 12;}
    // These lines ensure you have two-digits
    if (hh < 10) {
        hh = '0' + hh;
    }
    if (mm < 10) {
        mm = '0' + mm;
    }
    if (ss < 10) {
        ss = '0' + ss;
    }
    if (ms < 100) {
        ms = '0' + ms;
    }
    if (ms < 10) {
        ms = '00' + ms;
    }
    // This formats your string to HH:MM:SS
    var t = hh + ':' + mm + ':' + ss + ' (' + ms + ')';
    return t;
}

function format(level) {
  const time = formatTime(new Date());
  return '%c ' + time  +' :%c' + level + ': ';
}

var debug = function(){};
var info = function(){};
var warn = function(){};
var error = function(){};
var fatal = function(){};

/**
 * logLevel , decides the amount of logging to be used.
 *    * debug: 1
 *    * info: 2
 *    * warn: 3
 *    * error: 4
 *    * fatal: 5
 */
exports.setLogLevel = function(level){
    switch(level){
        case 1:
            exports.Log.debug = window.console.debug.bind(window.console, format('DEBUG', name), 'color:grey;', 'color: green;');
        case 2:
            exports.Log.info = window.console.debug.bind(window.console, format('INFO', name), 'color:grey;', 'color: info;');
        case 3:
            exports.Log.warn  = window.console.debug.bind(window.console, format('INFO',  name), 'color:grey;', 'color: orange;');
        case 4:
            exports.Log.error  = window.console.debug.bind(window.console, format('ERROR',  name), 'color:grey;', 'color: red;');
        case 5:
            exports.Log.fatal = window.console.debug.bind(window.console, format('FATAL', name), 'color:grey;', 'color: red;');
    }
}

exports.Log = {
    debug: debug,
    info: info,
    warn: warn,
    error: error,
    fatal: fatal,
};