micro.js

var Micro = (function() {
  var proxy = function() {};
  var wrap = function(zuper, fn) {
    return function() {
      var saved = this.zuper;
      this.zuper = zuper;
      try {
        return fn.apply(this, arguments);
      } finally {
        this.zuper = saved;
      }
    };
  };
  var classMethods = {
    extend: function(constructor) {
      var fn = wrap(this, constructor || function() {});
      proxy.prototype = this.prototype;
      fn.prototype = new proxy;
      fn.prototype.constructor = fn;
      for (var name in classMethods)
        fn[name] = classMethods[name];
      return fn;
    },
    include: function(properties) {
      var klass = this;
      for (var name in properties) {
        klass.prototype[name] = (function() {
          var zuper = klass.prototype[name];
          var value = properties[name];
          if (!zuper || typeof value != 'function')
            return value;
          return wrap(zuper, value);
        })();
      }
      return klass;
    }
  };
  var base = function() {};
  base.extend = classMethods.extend;
  return base;
})();