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Unified Diff: Source/core/dom/PromiseResolver.js

Issue 16838012: [ABANDONED] Implement Promises. (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master
Patch Set: Created 7 years, 6 months ago
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Index: Source/core/dom/PromiseResolver.js
diff --git a/Source/core/dom/PromiseResolver.js b/Source/core/dom/PromiseResolver.js
new file mode 100644
index 0000000000000000000000000000000000000000..a68c78cc0f74da17ce7d78179e799c0bffedbf7b
--- /dev/null
+++ b/Source/core/dom/PromiseResolver.js
@@ -0,0 +1,126 @@
+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+(function(postTask) {
+ function fulfill(value, synchronous)
+ {
+ if (this.promise === undefined || this.promise.state !== 'pending') {
abarth-chromium 2013/06/14 05:07:08 Do you mean "promise" in this ?
+ return;
+ }
+ this.promise.state = 'fulfilled';
+ this.promise.result = value;
+ var fulfillCallbacks = this.promise.fulfillCallbacks;
+ this.promise.fulfillCallbacks = [];
+ this.promise.rejectCallbacks = [];
+ // Detach the associated information. We don't need it from now on.
+ this.promise = undefined;
abarth-chromium 2013/06/14 05:07:08 Should we call "delete this.promise" instead?
+
+ if (synchronous) {
+ for (var i = 0; i < fulfillCallbacks.length; ++i) {
+ fulfillCallbacks[i](value);
+ }
+ } else {
+ for (var i = 0; i < fulfillCallbacks.length; ++i) {
+ postTask(fulfillCallbacks[i].bind(undefined, value));
+ }
+ }
+ }
+
+ function resolve(value, synchronous)
+ {
+ if (this.promise === undefined || this.promise.state !== 'pending') {
+ return;
+ }
+ var then = null;
+ if (typeof value === 'object') {
+ try {
+ then = value.then;
+ } catch (e) {
+ this.reject(e, synchronous);
+ return;
+ }
+ }
+ if (typeof then === 'function') {
+ try {
+ var self = this;
+ then.call(value, function(value) {
+ self.resolve(value, true);
+ }, function(value) {
+ self.reject(value, true);
+ });
+ } catch (e) {
+ this.reject(e, synchronous);
+ }
+ return;
+ }
+ this.fulfill(value, synchronous);
+ }
+
+ function reject(value, synchronous)
+ {
+ if (this.promise === undefined || this.promise.state !== 'pending') {
+ return;
+ }
+ this.promise.state = 'rejected';
+ this.promise.result = value;
+ var rejectCallbacks = this.promise.rejectCallbacks;
+ this.promise.fulfillCallbacks = [];
+ this.promise.rejectCallbacks = [];
+ // Detach the associated information. We don't need it from now on.
+ this.promise = undefined;
+
+ if (synchronous) {
+ for (var i = 0; i < rejectCallbacks.length; ++i) {
+ rejectCallbacks[i](value);
+ }
+ } else {
+ for (var i = 0; i < rejectCallbacks.length; ++i) {
+ postTask(rejectCallbacks[i].bind(undefined, value));
+ }
+ }
+ }
+
+ /**
+ * PromiseResolver constructor.
+ * @param promiseAssociated promise associated information
+ */
+ function $PromiseResolver(promiseAssociated)
+ {
+ this.promise = promiseAssociated;
+ }
+
+ $PromiseResolver.prototype = {
+ fulfill: fulfill,
+ resolve: resolve,
+ reject: reject
+ };
+
+ return Object.freeze($PromiseResolver);
+});

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