An interfacing library for the ecma5 or mozilla getter and setter support - whichever is implemented

Gotten.js

var Accessors = (function($, undefined) {
  var ECMA5Support =
    Object.getOwnPropertyDescriptor instanceof Function && 
    Object.defineProperty instanceof Function && (function() {
      var o = {}, f = function() {return true};
      try {
        Object.defineProperty(o, "o", {get: f});
        return o.o && Object.getOwnPropertyDescriptor(o, "o").get === f;
      } catch(e) {
        return false;
      }
    }
  )(), MozillaModelSupport =
    Object.prototype.__defineGetter__ instanceof Function &&
    Object.prototype.__defineSetter__ instanceof Function &&
    Object.prototype.__lookupGetter__ instanceof Function &&
    Object.prototype.__lookupSetter__ instanceof Function;
  
  if(ECMA5Support || MozillaModelSupport) {
    if(MozillaModelSupport) {
      $.append = function(object, property, opts) {
        if(opts.get instanceof Function) $.getter(object, property, opts.get);
        if(opts.set instanceof Function) $.setter(object, property, opts.set);
      };
      $.getter = function(object, property, func) {
        if(func instanceof Function)
          object.__defineGetter__(property, func);
        else return object.__lookupGetter__(property);
      };
      $.setter = function(object, property, func) {
        if(func instanceof Function)
          object.__defineSetter__(property, func);
        else return object.__lookupSetter__(property);
      };
      $.retrieve = function(object, property) {
        var o = {};
        o.get = object.__lookupGetter__(property);
        o.set = object.__lookupSetter__(property);
        return o;
      };
    } else {
      $.append = function(object, property, opts) {
        var desc = object.hasOwnProperty(property)?
          Object.getOwnPropertyDescriptor(object, property):{
            configurable: true,
            enumerable: true
          };
        if(opts.get instanceof Function) desc.get = opts.get;
        if(opts.set instanceof Function) desc.set = opts.set;
        delete object[property];
        Object.defineProperty(object, property, desc);
      };
      $.getter = function(object, property, func) {
        var exists = object.hasOwnProperty(property),
            setting = func instanceof Function;
        if(!exists && !setting) return;
        var desc = exists?
          Object.getOwnPropertyDescriptor(object, property):{
            configurable: true,
            enumerable: true
          };
        if(setting) {
          desc.get = func;
          delete object[property];
          Object.defineProperty(object, property, desc);
        } else return desc.get;
      };
      $.setter = function(object, property, func) {
        var exists = object.hasOwnProperty(property),
            setting = func instanceof Function;
        if(!exists && !setting) return;
        var desc = exists?
          Object.getOwnPropertyDescriptor(object, property):{
            configurable: true,
            enumerable: true
          };
        if(setting) {
          desc.set = func;
          delete object[property];
          Object.defineProperty(object, property, desc);
        } else return desc.set;
      };
      $.retrieve = function(object, property) {
        var desc = Object.getOwnPropertyDescriptor(object, property), o = {};
        o.get = desc.get;
        o.set = desc.set;
        return o;
      };
    }    $.supported = true;
  } else $.supported = false;
  if(Object.freeze instanceof Function)
     Object.freeze($);
  return $;
})({});