addon-sdk/source/lib/sdk/lang/weak-set.js@129ffea94266 (annotated)
addon-sdk/source/lib/sdk/lang/weak-set.js
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
| michael@0 | 1 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 2 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 3 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | module.metadata = { |
| michael@0 | 6 | "stability": "experimental" |
| michael@0 | 7 | }; |
| michael@0 | 8 | |
| michael@0 | 9 | "use strict"; |
| michael@0 | 10 | |
| michael@0 | 11 | const { Cu } = require("chrome"); |
| michael@0 | 12 | |
| michael@0 | 13 | function makeGetterFor(Type) { |
| michael@0 | 14 | let cache = new WeakMap(); |
| michael@0 | 15 | |
| michael@0 | 16 | return function getFor(target) { |
| michael@0 | 17 | if (!cache.has(target)) |
| michael@0 | 18 | cache.set(target, new Type()); |
| michael@0 | 19 | |
| michael@0 | 20 | return cache.get(target); |
| michael@0 | 21 | } |
| michael@0 | 22 | } |
| michael@0 | 23 | |
| michael@0 | 24 | let getLookupFor = makeGetterFor(WeakMap); |
| michael@0 | 25 | let getRefsFor = makeGetterFor(Set); |
| michael@0 | 26 | |
| michael@0 | 27 | function add(target, value) { |
| michael@0 | 28 | if (has(target, value)) |
| michael@0 | 29 | return; |
| michael@0 | 30 | |
| michael@0 | 31 | getLookupFor(target).set(value, true); |
| michael@0 | 32 | getRefsFor(target).add(Cu.getWeakReference(value)); |
| michael@0 | 33 | } |
| michael@0 | 34 | exports.add = add; |
| michael@0 | 35 | |
| michael@0 | 36 | function remove(target, value) { |
| michael@0 | 37 | getLookupFor(target).delete(value); |
| michael@0 | 38 | } |
| michael@0 | 39 | exports.remove = remove; |
| michael@0 | 40 | |
| michael@0 | 41 | function has(target, value) { |
| michael@0 | 42 | return getLookupFor(target).has(value); |
| michael@0 | 43 | } |
| michael@0 | 44 | exports.has = has; |
| michael@0 | 45 | |
| michael@0 | 46 | function clear(target) { |
| michael@0 | 47 | getLookupFor(target).clear(); |
| michael@0 | 48 | getRefsFor(target).clear(); |
| michael@0 | 49 | } |
| michael@0 | 50 | exports.clear = clear; |
| michael@0 | 51 | |
| michael@0 | 52 | function iterator(target) { |
| michael@0 | 53 | let refs = getRefsFor(target); |
| michael@0 | 54 | |
| michael@0 | 55 | for (let ref of refs) { |
| michael@0 | 56 | let value = ref.get(); |
| michael@0 | 57 | |
| michael@0 | 58 | // If `value` is already gc'ed, it would be `null`. |
| michael@0 | 59 | // The `has` function is using a WeakMap as lookup table, so passing `null` |
| michael@0 | 60 | // would raise an exception because WeakMap accepts as value only non-null |
| michael@0 | 61 | // object. |
| michael@0 | 62 | // Plus, if `value` is already gc'ed, we do not have to take it in account |
| michael@0 | 63 | // during the iteration, and remove it from the references. |
| michael@0 | 64 | if (value !== null && has(target, value)) |
| michael@0 | 65 | yield value; |
| michael@0 | 66 | else |
| michael@0 | 67 | refs.delete(ref); |
| michael@0 | 68 | } |
| michael@0 | 69 | } |
| michael@0 | 70 | exports.iterator = iterator; |
