log4js-node/lib/levels.js

function Level(level, levelStr) {
    this.level = level;
    this.levelStr = levelStr;
}

/**
 * converts given String to corresponding Level
 * @param {String} sArg String value of Level OR Log4js.Level
 * @param {Log4js.Level} defaultLevel default Level, if no String representation
 * @return Level object
 * @type Log4js.Level
 */
function toLevel(sArg, defaultLevel) {

  if (sArg === null) {
	  return defaultLevel;
  }

  if (typeof sArg == "string") {
	  var s = sArg.toUpperCase();
	  if (module.exports[s]) {
	    return module.exports[s];
	  }
	  else {
	    return defaultLevel;
	  }
  }

  return toLevel(sArg.toString());

};

Level.prototype.toString = function() {
    return this.levelStr;
};

Level.prototype.isLessThanOrEqualTo = function(otherLevel) {
    if (typeof otherLevel === "string") {
        otherLevel = toLevel(otherLevel);
    }
    return this.level <= otherLevel.level;
};

Level.prototype.isGreaterThanOrEqualTo = function(otherLevel) {
    if (typeof otherLevel === "string") {
        otherLevel = toLevel(otherLevel);
    }
    return this.level >= otherLevel.level;
};

module.exports = {
    ALL: new Level(Number.MIN_VALUE, "ALL")
  , TRACE: new Level(5000, "TRACE")
  , DEBUG: new Level(10000, "DEBUG")
  , INFO: new Level(20000, "INFO")
  , WARN: new Level(30000, "WARN")
  , ERROR: new Level(40000, "ERROR")
  , FATAL: new Level(50000, "FATAL")
  , OFF: new Level(Number.MAX_VALUE, "OFF")
  , toLevel: toLevel
};