text: var SPLITER = /[ ,]+/;
  
  
  function Mime(){
  	
  	this.types = {};
  	this.extensions = {};
  	
  	this.defaultType = "text/plain";
  	this.defaultExtension = "txt";
  	
  	this.register("*/*", "*");
  	
  	this.register("text/html", "html htm xhtml");
  	this.register("text/plain", "txt");
  	this.register("application/javascript", "js");
  	this.register("text/css", "css");
  	this.register("text/calendar", "ics");
  	this.register("text/csv", "csv");
  	
  	this.register("image/png", "png");
  	this.register("image/jpeg", "jpeg jpg");
  	this.register("image/gif", "gif");
  	this.register("image/bmp", "bmp");
  	this.register("image/x-icon", "ico");
  	this.register("image/tiff", "tiff tif");
  	this.register("image/svg+xml", "svg");
  	
  	this.register("video/mpeg", "mpg mpeg mpe");
  	
  	this.register("application/xml", "xml");
  	this.register("application/rss+xml", "rss");
  	this.register("application/atom+xml", "atom");
  	this.register("application/x-yaml", "yaml");
  	
  	this.register("multipart/form-data", "multipart_form");
  	this.register("application/x-www-form-urlencoded", "url_encoded_form");
  	
  	this.register("application/x-font-ttf", "ttf");
  	this.register("application/x-font-truetype", "ttf");
  	this.register("application/x-font-opentype", "otf");
  	this.register("application/font-woff", "woff");
  	this.register("application/vnd.ms-fontobject", "eot");
  	
  	this.register("application/json", "map");
  	this.register("application/json", "json");
  	this.register("application/pdf", "pdf");
  	this.register("application/zip", "zip");
  }
  
  
  Mime.prototype.register = function(type, exts){
  	var types = this.types,
  		extensions = this.extensions,
  		ext,
  		i;
  	
  	exts = exts.split(SPLITER);
  	
  	for (i = exts.length; i--;) {
  		ext = exts[i];
  		if (!ext.length) continue;
  		if (!extensions[ext]) extensions[ext] = type;
  	}
  	
  	if (!types[type] && exts[0]) types[type] = exts[0];
  	
  	return this;
  };
  
  
  Mime.prototype.unregister = function(exts){
  	var types = this.types,
  		extensions = this.extensions,
  		key, i;
  	
  	exts = exts.split(SPLITER);
  	
  	for (i = exts.length; i--;) {
  		ext = exts[i];
  		if (!ext.length) continue;
  		
  		for (key in types) {
  			
  			if (types[key] === ext) types[key] = undefined;
  		}
  		
  		extensions[ext] = undefined;
  	}
  	
  	return this;
  };
  
  
  Mime.prototype.unregisterType = function(type){
  	var types = this.types,
  		extensions = this.extensions,
  		key, i;
  		
  	for (key in extensions) {
  		
  		if (extensions[key] === type) extensions[key] = undefined;
  	}
  	
  	types[type] = undefined;
  	
  	return this;
  };
  
  
  Mime.prototype.lookUpType = function(ext, fallback){
  	var type = this.extensions[ext];
  	fallback = fallback === undefined ? true : !!fallback;
  	
  	return type ? type : fallback ? this.defaultType : undefined;
  };
  
  
  Mime.prototype.lookUpExt = function(type, fallback){
  	var ext = this.types[type];
  	fallback = fallback === undefined ? true : !!fallback;
  	
  	return ext ? ext : fallback ? this.defaultExtension : undefined;
  };
  
  
  module.exports = new Mime;