--- /dev/null
+"use strict";
+module.exports = function (Promise, apiRejection, tryConvertToPromise,
+ createContext, INTERNAL, debug) {
+ var util = require("./util");
+ var TypeError = require("./errors").TypeError;
+ var inherits = require("./util").inherits;
+ var errorObj = util.errorObj;
+ var tryCatch = util.tryCatch;
+
+ function thrower(e) {
+ setTimeout(function(){throw e;}, 0);
+ }
+
+ function castPreservingDisposable(thenable) {
+ var maybePromise = tryConvertToPromise(thenable);
+ if (maybePromise !== thenable &&
+ typeof thenable._isDisposable === "function" &&
+ typeof thenable._getDisposer === "function" &&
+ thenable._isDisposable()) {
+ maybePromise._setDisposable(thenable._getDisposer());
+ }
+ return maybePromise;
+ }
+ function dispose(resources, inspection) {
+ var i = 0;
+ var len = resources.length;
+ var ret = new Promise(INTERNAL);
+ function iterator() {
+ if (i >= len) return ret._fulfill();
+ var maybePromise = castPreservingDisposable(resources[i++]);
+ if (maybePromise instanceof Promise &&
+ maybePromise._isDisposable()) {
+ try {
+ maybePromise = tryConvertToPromise(
+ maybePromise._getDisposer().tryDispose(inspection),
+ resources.promise);
+ } catch (e) {
+ return thrower(e);
+ }
+ if (maybePromise instanceof Promise) {
+ return maybePromise._then(iterator, thrower,
+ null, null, null);
+ }
+ }
+ iterator();
+ }
+ iterator();
+ return ret;
+ }
+
+ function Disposer(data, promise, context) {
+ this._data = data;
+ this._promise = promise;
+ this._context = context;
+ }
+
+ Disposer.prototype.data = function () {
+ return this._data;
+ };
+
+ Disposer.prototype.promise = function () {
+ return this._promise;
+ };
+
+ Disposer.prototype.resource = function () {
+ if (this.promise().isFulfilled()) {
+ return this.promise().value();
+ }
+ return null;
+ };
+
+ Disposer.prototype.tryDispose = function(inspection) {
+ var resource = this.resource();
+ var context = this._context;
+ if (context !== undefined) context._pushContext();
+ var ret = resource !== null
+ ? this.doDispose(resource, inspection) : null;
+ if (context !== undefined) context._popContext();
+ this._promise._unsetDisposable();
+ this._data = null;
+ return ret;
+ };
+
+ Disposer.isDisposer = function (d) {
+ return (d != null &&
+ typeof d.resource === "function" &&
+ typeof d.tryDispose === "function");
+ };
+
+ function FunctionDisposer(fn, promise, context) {
+ this.constructor$(fn, promise, context);
+ }
+ inherits(FunctionDisposer, Disposer);
+
+ FunctionDisposer.prototype.doDispose = function (resource, inspection) {
+ var fn = this.data();
+ return fn.call(resource, resource, inspection);
+ };
+
+ function maybeUnwrapDisposer(value) {
+ if (Disposer.isDisposer(value)) {
+ this.resources[this.index]._setDisposable(value);
+ return value.promise();
+ }
+ return value;
+ }
+
+ function ResourceList(length) {
+ this.length = length;
+ this.promise = null;
+ this[length-1] = null;
+ }
+
+ ResourceList.prototype._resultCancelled = function() {
+ var len = this.length;
+ for (var i = 0; i < len; ++i) {
+ var item = this[i];
+ if (item instanceof Promise) {
+ item.cancel();
+ }
+ }
+ };
+
+ Promise.using = function () {
+ var len = arguments.length;
+ if (len < 2) return apiRejection(
+ "you must pass at least 2 arguments to Promise.using");
+ var fn = arguments[len - 1];
+ if (typeof fn !== "function") {
+ return apiRejection("expecting a function but got " + util.classString(fn));
+ }
+ var input;
+ var spreadArgs = true;
+ if (len === 2 && Array.isArray(arguments[0])) {
+ input = arguments[0];
+ len = input.length;
+ spreadArgs = false;
+ } else {
+ input = arguments;
+ len--;
+ }
+ var resources = new ResourceList(len);
+ for (var i = 0; i < len; ++i) {
+ var resource = input[i];
+ if (Disposer.isDisposer(resource)) {
+ var disposer = resource;
+ resource = resource.promise();
+ resource._setDisposable(disposer);
+ } else {
+ var maybePromise = tryConvertToPromise(resource);
+ if (maybePromise instanceof Promise) {
+ resource =
+ maybePromise._then(maybeUnwrapDisposer, null, null, {
+ resources: resources,
+ index: i
+ }, undefined);
+ }
+ }
+ resources[i] = resource;
+ }
+
+ var reflectedResources = new Array(resources.length);
+ for (var i = 0; i < reflectedResources.length; ++i) {
+ reflectedResources[i] = Promise.resolve(resources[i]).reflect();
+ }
+
+ var resultPromise = Promise.all(reflectedResources)
+ .then(function(inspections) {
+ for (var i = 0; i < inspections.length; ++i) {
+ var inspection = inspections[i];
+ if (inspection.isRejected()) {
+ errorObj.e = inspection.error();
+ return errorObj;
+ } else if (!inspection.isFulfilled()) {
+ resultPromise.cancel();
+ return;
+ }
+ inspections[i] = inspection.value();
+ }
+ promise._pushContext();
+
+ fn = tryCatch(fn);
+ var ret = spreadArgs
+ ? fn.apply(undefined, inspections) : fn(inspections);
+ var promiseCreated = promise._popContext();
+ debug.checkForgottenReturns(
+ ret, promiseCreated, "Promise.using", promise);
+ return ret;
+ });
+
+ var promise = resultPromise.lastly(function() {
+ var inspection = new Promise.PromiseInspection(resultPromise);
+ return dispose(resources, inspection);
+ });
+ resources.promise = promise;
+ promise._setOnCancel(resources);
+ return promise;
+ };
+
+ Promise.prototype._setDisposable = function (disposer) {
+ this._bitField = this._bitField | 131072;
+ this._disposer = disposer;
+ };
+
+ Promise.prototype._isDisposable = function () {
+ return (this._bitField & 131072) > 0;
+ };
+
+ Promise.prototype._getDisposer = function () {
+ return this._disposer;
+ };
+
+ Promise.prototype._unsetDisposable = function () {
+ this._bitField = this._bitField & (~131072);
+ this._disposer = undefined;
+ };
+
+ Promise.prototype.disposer = function (fn) {
+ if (typeof fn === "function") {
+ return new FunctionDisposer(fn, this, createContext());
+ }
+ throw new TypeError();
+ };
+
+};
projects / yaffs-website / blobdiff