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
};

let 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;
}


class Log {
    constructor(level) {
        this.level = level;
    }

    log(str, level) {
        let logLevel = this.level;
        if(typeof logLevel === 'undefined'){
            logLevel = defaultLevel;
        }
        if (logLevel <= level) {
            if (typeof console !== 'undefined') { //eslint-disable-line no-console
                if (typeof console.log !== 'undefined') { //eslint-disable-line no-console
                    return console.log('[' + formatTime(new Date()) + '] ' + str); //eslint-disable-line no-console
                }
            }
        }
    }

    trace(str) {
        this.log(str, LEVELS.trace);
    }

    debug(str) {
        this.log(str, LEVELS.debug);
    }

    info(str) {
        this.log(str, LEVELS.info);
    }

    warn(str) {
        this.log(str, LEVELS.warn);
    }

    error(str) {
        this.log(str, LEVELS.error);
    }
}

exports.Log = Log;