/usr/lib/thunderbird-addons/extensions/{a62ef8ec-5fdc-40c2-873c-223b8a6925cc}/modules/shim/Promise.jsm is in xul-ext-gdata-provider 1:52.7.0+build1-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
var EXPORTED_SYMBOLS = ["Promise"];
var STATUS_PENDING = 0;
var STATUS_RESOLVED = 1;
var STATUS_REJECTED = 2;
function log(msg) {
// Enable this to debug promises
//dump("PROMISES: " + msg + "\n");
}
var PromiseWalker = {
handlers: [],
completePromise: function(aPromise, aStatus, aValue) {
if (aPromise._status != STATUS_PENDING) {
return;
}
if (aStatus == STATUS_RESOLVED && aValue &&
typeof(aValue.then) == "function") {
aValue.then(this.completePromise.bind(this, aPromise, STATUS_RESOLVED),
this.completePromise.bind(this, aPromise, STATUS_REJECTED));
return;
}
aPromise._status = aStatus;
aPromise._value = aValue;
if (aPromise._handlers.length > 0) {
this.schedulePromise(aPromise);
} else if (aStatus == STATUS_REJECTED) {
log("Pending error: " + aValue);
}
},
scheduleWalkerLoop: function() {
this.walkerLoopScheduled = true;
let thread = Components.classes["@mozilla.org/thread-manager;1"]
.getService(Components.interfaces.nsIThreadManager)
.currentThread;
thread.dispatch({
run: function() {
PromiseWalker.walkerLoop();
}
}, Components.interfaces.nsIEventTarget.DISPATCH_NORMAL);
},
schedulePromise: function (aPromise) {
for each (let handler in aPromise._handlers) {
this.handlers.push(handler);
}
aPromise._handlers.length = 0;
if (!this.walkerLoopScheduled) {
this.scheduleWalkerLoop();
}
},
walkerLoopScheduled: false,
walkerLoop: function() {
if (this.handlers.length > 1) {
this.scheduleWalkerLoop();
} else {
this.walkerLoopScheduled = false;
}
while (this.handlers.length > 0) {
this.handlers.shift().process();
}
}
};
PromiseWalker.walkerLoop = PromiseWalker.walkerLoop.bind(PromiseWalker);
function Handler(aThisPromise, aOnResolve, aOnReject) {
this.thisPromise = aThisPromise;
this.onResolve = aOnResolve;
this.onReject = aOnReject;
this.nextPromise = new Promise(function() {});
}
Handler.prototype = {
process: function() {
let nextStatus = this.thisPromise._status;
let nextValue = this.thisPromise._value;
try {
if (nextStatus == STATUS_RESOLVED) {
if (typeof(this.onResolve) == "function") {
nextValue = this.onResolve.call(undefined, nextValue);
}
} else if (typeof(this.onReject) == "function") {
nextValue = this.onReject.call(undefined, nextValue);
nextStatus = STATUS_RESOLVED;
}
} catch (ex) {
// Enable this to get promise debugging
log("EXCEPTION: " + ex + "\n" + ex.stack + ex.printStackTrace);
nextStatus = STATUS_REJECTED;
nextValue = ex;
}
PromiseWalker.completePromise(this.nextPromise, nextStatus, nextValue);
}
};
function Deferred() {
this.promise = new Promise(function(aResolve, aReject) {
this.resolve = aResolve;
this.reject = aReject;
}.bind(this));
}
function Promise(executor) {
this._handlers = [];
let resolve = PromiseWalker.completePromise.bind(PromiseWalker, this, STATUS_RESOLVED);
let reject = PromiseWalker.completePromise.bind(PromiseWalker, this, STATUS_REJECTED);
try {
executor.call(undefined, resolve, reject);
} catch (ex) {
reject(ex);
}
}
Promise.prototype = {
_status: STATUS_PENDING,
_value: undefined,
then: function(aOnResolve, aOnReject) {
let handler = new Handler(this, aOnResolve, aOnReject);
this._handlers.push(handler);
if (this._status != STATUS_PENDING) {
PromiseWalker.schedulePromise(this);
}
return handler.nextPromise;
},
catch: function(onreject) {
return this.then(undefined, onReject);
}
};
Promise.defer = function() {
return new Deferred();
};
Promise.resolve = function(aValue) {
if (aValue instanceof Promise) {
return aValue;
}
return new Promise(function(aResolve) { return aResolve(aValue); });
};
Promise.reject = function(aReason) {
return new Promise(function(_, aReject) { return aReject(aReason); });
}
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