only Firefox4, E4X hack:: Namespace accessor

nsproxy.js

/*

// Example::
(function(ns){
  ns.foo = "abc";
  // => window["teramako.github.com::foo"] == "abc"
})(NS("github", "teramako.github.com"));

*/


function NS (name, uri, target) {
  if (!target)
    target = this;

  var ns = new Namespace(name, uri);
  var prefix = uri + "::";

  if (!NS[name]) {
    Object.defineProperty(NS, name, {
      value: ns,
      writable: false,
    });
  }

  function filter (keys) {
    var result = [];
    for (var i = 0, len = keys.length; i < len; i++) {
      if (keys[i].indexOf(prefix) == 0) {
        result.push(keys[i].substr(prefix.length));
      }
    }
    return result;
  }

  return Proxy.create({
    getOwnPropertyDescriptor: function (name) {
      var desc = Object.getOwnPropertyDescriptor(target, prefix + name);
      if (desc !== void(0)) { desc.configurable = true; }
      return desc;
    },
    getOwnPropertyNames: function () {
      return filter(Object.getOwnPropertyNames(target));
    },
    keys: function () {
      return filter(Object.keys(target));
    },
    defineProperty: function (name, desc) {
      Object.defineProperty(target, prefix + name, desc);
    },
    delete: function (name) {
      return delete target.ns::[name];
    },
    fix: function () {
      if (Object.isFrozen(target)) {
        return filter(Object.getOwnPropertyNames(target)).map(function(name) {
          return Object.getOwnPropertyDescriptor(target, prefix + name);
        });
      }
      return void(0);
    },
    enumerate: function () {
      return filter(Object.keys(target));
    },
    get: function(p, name) {
      return target.ns::[name];
    },
    set: function (p, name, value){
      return target.ns::[name] = value;
    },
    has: function (name) {
      return prefix + name in target;
    },
    hasOwn: function (name) {
      return target.hasOwnProperty(prefix + name);
    },
  });
}