59 lines
1.5 KiB
JavaScript
59 lines
1.5 KiB
JavaScript
/* 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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export function AsyncRunner(callbacks) {
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this._callbacks = callbacks;
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this._iteratorQueue = [];
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// This catches errors reported to the console, e.g., via Cu.reportError.
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Services.console.registerListener(this);
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}
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AsyncRunner.prototype = {
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appendIterator: function AR_appendIterator(iter) {
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this._iteratorQueue.push(iter);
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},
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next: function AR_next(arg) {
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if (!this._iteratorQueue.length) {
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this.destroy();
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this._callbacks.done();
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return;
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}
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try {
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var { done, value } = this._iteratorQueue[0].next(arg);
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if (done) {
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this._iteratorQueue.shift();
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this.next();
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return;
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}
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} catch (err) {
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this._callbacks.error(err);
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}
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// val is truthy => call next
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// val is an iterator => prepend it to the queue and start on it
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if (value) {
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if (typeof value != "boolean") {
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this._iteratorQueue.unshift(value);
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}
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this.next();
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}
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},
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destroy: function AR_destroy() {
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Services.console.unregisterListener(this);
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this.destroy = function AR_alreadyDestroyed() {};
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},
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observe: function AR_consoleServiceListener(msg) {
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if (
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msg instanceof Ci.nsIScriptError &&
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!(msg.flags & Ci.nsIScriptError.warningFlag)
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) {
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this._callbacks.consoleError(msg);
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}
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},
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};
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