The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/addon-sdk/source/lib/sdk/ui/id.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,27 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +'use strict';
     1.8 +
     1.9 +module.metadata = {
    1.10 +  'stability': 'experimental'
    1.11 +};
    1.12 +
    1.13 +const method = require('../../method/core');
    1.14 +const { uuid } = require('../util/uuid');
    1.15 +
    1.16 +// NOTE: use lang/functional memoize when it is updated to use WeakMap
    1.17 +function memoize(f) {
    1.18 +  const memo = new WeakMap();
    1.19 +
    1.20 +  return function memoizer(o) {
    1.21 +    let key = o;
    1.22 +    if (!memo.has(key))
    1.23 +      memo.set(key, f.apply(this, arguments));
    1.24 +    return memo.get(key);
    1.25 +  };
    1.26 +}
    1.27 +
    1.28 +let identify = method('identify');
    1.29 +identify.define(Object, memoize(function() { return uuid(); }));
    1.30 +exports.identify = identify;