toolkit/components/contentprefs/tests/unit_cps2/AsyncRunner.jsm@6474c204b198 (annotated)
toolkit/components/contentprefs/tests/unit_cps2/AsyncRunner.jsm
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| 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 file, |
| michael@0 | 3 | * You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 4 | |
| michael@0 | 5 | let EXPORTED_SYMBOLS = [ |
| michael@0 | 6 | "AsyncRunner", |
| michael@0 | 7 | ]; |
| michael@0 | 8 | |
| michael@0 | 9 | const { interfaces: Ci, classes: Cc } = Components; |
| michael@0 | 10 | |
| michael@0 | 11 | function AsyncRunner(callbacks) { |
| michael@0 | 12 | this._callbacks = callbacks; |
| michael@0 | 13 | this._iteratorQueue = []; |
| michael@0 | 14 | |
| michael@0 | 15 | // This catches errors reported to the console, e.g., via Cu.reportError. |
| michael@0 | 16 | Cc["@mozilla.org/consoleservice;1"]. |
| michael@0 | 17 | getService(Ci.nsIConsoleService). |
| michael@0 | 18 | registerListener(this); |
| michael@0 | 19 | } |
| michael@0 | 20 | |
| michael@0 | 21 | AsyncRunner.prototype = { |
| michael@0 | 22 | |
| michael@0 | 23 | appendIterator: function AR_appendIterator(iter) { |
| michael@0 | 24 | this._iteratorQueue.push(iter); |
| michael@0 | 25 | }, |
| michael@0 | 26 | |
| michael@0 | 27 | next: function AR_next(/* ... */) { |
| michael@0 | 28 | if (!this._iteratorQueue.length) { |
| michael@0 | 29 | this.destroy(); |
| michael@0 | 30 | this._callbacks.done(); |
| michael@0 | 31 | return; |
| michael@0 | 32 | } |
| michael@0 | 33 | |
| michael@0 | 34 | // send() discards all arguments after the first, so there's no choice here |
| michael@0 | 35 | // but to send only one argument to the yielder. |
| michael@0 | 36 | let args = [arguments.length <= 1 ? arguments[0] : Array.slice(arguments)]; |
| michael@0 | 37 | try { |
| michael@0 | 38 | var val = this._iteratorQueue[0].send.apply(this._iteratorQueue[0], args); |
| michael@0 | 39 | } |
| michael@0 | 40 | catch (err if err instanceof StopIteration) { |
| michael@0 | 41 | this._iteratorQueue.shift(); |
| michael@0 | 42 | this.next(); |
| michael@0 | 43 | return; |
| michael@0 | 44 | } |
| michael@0 | 45 | catch (err) { |
| michael@0 | 46 | this._callbacks.error(err); |
| michael@0 | 47 | } |
| michael@0 | 48 | |
| michael@0 | 49 | // val is truthy => call next |
| michael@0 | 50 | // val is an iterator => prepend it to the queue and start on it |
| michael@0 | 51 | if (val) { |
| michael@0 | 52 | if (typeof(val) != "boolean") |
| michael@0 | 53 | this._iteratorQueue.unshift(val); |
| michael@0 | 54 | this.next(); |
| michael@0 | 55 | } |
| michael@0 | 56 | }, |
| michael@0 | 57 | |
| michael@0 | 58 | destroy: function AR_destroy() { |
| michael@0 | 59 | Cc["@mozilla.org/consoleservice;1"]. |
| michael@0 | 60 | getService(Ci.nsIConsoleService). |
| michael@0 | 61 | unregisterListener(this); |
| michael@0 | 62 | this.destroy = function AR_alreadyDestroyed() {}; |
| michael@0 | 63 | }, |
| michael@0 | 64 | |
| michael@0 | 65 | observe: function AR_consoleServiceListener(msg) { |
| michael@0 | 66 | if (msg instanceof Ci.nsIScriptError && |
| michael@0 | 67 | !(msg.flags & Ci.nsIScriptError.warningFlag)) |
| michael@0 | 68 | { |
| michael@0 | 69 | this._callbacks.consoleError(msg); |
| michael@0 | 70 | } |
| michael@0 | 71 | }, |
| michael@0 | 72 | }; |
