JavaScriptCore-7601.1.46.3.tar.gz

[apple/javascriptcore.git] / builtins / PromiseConstructor.js

diff --git a/builtins/PromiseConstructor.js b/builtins/PromiseConstructor.js
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+++ b/builtins/PromiseConstructor.js
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+/*
+ * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 all(iterable)
+{
+    "use strict";
+
+    if (!@isObject(this))
+        throw new TypeError("|this| is not a object");
+
+    // FIXME: Fix this code when @@species well-known symbol is landed.
+    // https://bugs.webkit.org/show_bug.cgi?id=146624
+    var constructor = this;
+
+    var promiseCapability = @newPromiseCapability(constructor);
+
+    var values = [];
+    var index = 0;
+    var remainingElementsCount = 1;
+
+    function newResolveElement(index)
+    {
+        var alreadyCalled = false;
+        return function (argument)
+        {
+            if (alreadyCalled)
+                return undefined;
+            alreadyCalled = true;
+
+            @putByValDirect(values, index, argument);
+
+            --remainingElementsCount;
+            if (remainingElementsCount === 0)
+                return promiseCapability.@resolve.@call(undefined, values);
+
+            return undefined;
+        }
+    }
+
+    try {
+        for (var value of iterable) {
+            @putByValDirect(values, index, undefined);
+            var nextPromise = constructor.resolve(value);
+            var resolveElement = newResolveElement(index);
+            ++remainingElementsCount;
+            nextPromise.then(resolveElement, promiseCapability.@reject);
+            ++index;
+        }
+
+        --remainingElementsCount;
+        if (remainingElementsCount === 0)
+            promiseCapability.@resolve.@call(undefined, values);
+    } catch (error) {
+        promiseCapability.@reject.@call(undefined, error);
+    }
+
+    return promiseCapability.@promise;
+}
+
+function race(iterable)
+{
+    "use strict";
+
+    if (!@isObject(this))
+        throw new TypeError("|this| is not a object");
+
+    // FIXME: Fix this code when @@species well-known symbol is landed.
+    // https://bugs.webkit.org/show_bug.cgi?id=146624
+    var constructor = this;
+
+    var promiseCapability = @newPromiseCapability(constructor);
+
+    try {
+        for (var value of iterable) {
+            var nextPromise = constructor.resolve(value);
+            nextPromise.then(promiseCapability.@resolve, promiseCapability.@reject);
+        }
+    } catch (error) {
+        promiseCapability.@reject.@call(undefined, error);
+    }
+
+    return promiseCapability.@promise;
+}
+
+function reject(reason)
+{
+    "use strict";
+
+    if (!@isObject(this))
+        throw new TypeError("|this| is not a object");
+
+    var promiseCapability = @newPromiseCapability(this);
+
+    promiseCapability.@reject.@call(undefined, reason);
+
+    return promiseCapability.@promise;
+}
+
+function resolve(value)
+{
+    "use strict";
+
+    if (!@isObject(this))
+        throw new TypeError("|this| is not a object");
+
+    if (@isPromise(value)) {
+        var valueConstructor = value.constructor;
+        if (valueConstructor === this)
+            return value;
+    }
+
+    var promiseCapability = @newPromiseCapability(this);
+
+    promiseCapability.@resolve.@call(undefined, value);
+
+    return promiseCapability.@promise;
+}