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4d6a633bba
The -*- file variable lines -*- establish per-file settings that Emacs will pick up. This patch makes the following changes to those lines (and touches nothing else): - Never set the buffer's mode. Years ago, Emacs did not have a good JavaScript mode, so it made sense to use Java or C++ mode in .js files. However, Emacs has had js-mode for years now; it's perfectly serviceable, and is available and enabled by default in all major Emacs packagings. Selecting a mode in the -*- file variable line -*- is almost always the wrong thing to do anyway. It overrides Emacs's default choice, which is (now) reasonable; and even worse, it overrides settings the user might have made in their '.emacs' file for that file extension. It's only useful when there's something specific about that particular file that makes a particular mode appropriate. - Correctly propagate settings that establish the correct indentation level for this file: c-basic-offset and js2-basic-offset should be js-indent-level. Whatever value they're given should be preserved; different parts of our tree use different indentation styles. - We don't use tabs in Mozilla JS code. Always set indent-tabs-mode: nil. Remove tab-width: settings, at least in files that don't contain tab characters. - Remove js2-mode settings that belong in the user's .emacs file, like js2-skip-preprocessor-directives.
81 lines
2.5 KiB
JavaScript
81 lines
2.5 KiB
JavaScript
// -*- indent-tabs-mode: nil; js-indent-level: 2 -*-
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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this.EXPORTED_SYMBOLS = ["sendOrderedBroadcast"];
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const { classes: Cc, interfaces: Ci, utils: Cu } = Components;
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// For adding observers.
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Cu.import("resource://gre/modules/Services.jsm");
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Cu.import("resource://gre/modules/Messaging.jsm");
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let _callbackId = 1;
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/**
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* Send an ordered broadcast to Java.
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*
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* Internally calls Context.sendOrderedBroadcast.
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*
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* action {String} should be a string with a qualified name (like
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* org.mozilla.gecko.action) that will be broadcast.
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*
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* token {Object} is a piece of arbitrary data that will be given as
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* a parameter to the callback (possibly null).
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*
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* callback {function} should accept three arguments: the data
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* returned from Java as an Object; the specified token; and the
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* specified action.
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*
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* permission {String} is an optional string with an Android permission
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* that packages must have to respond to the ordered broadcast. A null
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* value allows any package to respond. If the parameter is omitted (or
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* {undefined}), then the intent is restricted to the current package.
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*/
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function sendOrderedBroadcast(action, token, callback, permission) {
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let callbackId = _callbackId++;
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let responseEvent = "OrderedBroadcast:Response:" + callbackId;
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let observer = {
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callbackId: callbackId,
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callback: callback,
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observe: function observe(subject, topic, data) {
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if (topic != responseEvent) {
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return;
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}
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// Unregister observer as soon as possible.
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Services.obs.removeObserver(observer, responseEvent);
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let msg = JSON.parse(data);
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if (!msg.action || !msg.token || !msg.token.callbackId)
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return;
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let theToken = msg.token.data;
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let theAction = msg.action;
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let theData = msg.data ? JSON.parse(msg.data) : null;
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let theCallback = this.callback;
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if (!theCallback)
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return;
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// This is called from within a notified observer, so we don't
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// need to take special pains to catch exceptions.
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theCallback(theData, theToken, theAction);
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},
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};
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Services.obs.addObserver(observer, responseEvent, false);
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sendMessageToJava({
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type: "OrderedBroadcast:Send",
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action: action,
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responseEvent: responseEvent,
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token: { callbackId: callbackId, data: token || null },
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permission: permission,
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});
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};
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