webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 86 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/builtins/InternalPromiseConstructor.js b/Source/JavaScriptCore/builtins/InternalPromiseConstructor.js
new file mode 100644
index 000000000..d01f5f7e5
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+++ b/Source/JavaScriptCore/builtins/InternalPromiseConstructor.js
@@ -0,0 +1,86 @@
+/*
+ * Copyright (C) 2015 Apple 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:
+ * 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 internalAll(array)
+{
+    // This function is intended to be used in the JSC internals.
+    // The implementation should take care not to perform the user
+    // observable / trappable operations.
+    //
+    // 1. Don't use for-of and iterables. This function only accepts
+    //    the dense array of the promises.
+    // 2. Don't look up this.constructor / @@species. Always construct
+    //    the plain Promise object.
+
+    "use strict";
+
+    var promiseCapability = @newPromiseCapability(@InternalPromise);
+
+    var values = [];
+    var index = 0;
+    var remainingElementsCount = 0;
+
+    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 {
+        if (array.length === 0)
+            promiseCapability.@resolve.@call(@undefined, values);
+        else {
+            for (var index = 0, length = array.length; index < length; ++index) {
+                var value = array[index];
+                @putByValDirect(values, index, @undefined);
+
+                var nextPromiseCapability = @newPromiseCapability(@InternalPromise);
+                nextPromiseCapability.@resolve.@call(@undefined, value);
+                var nextPromise = nextPromiseCapability.@promise;
+
+                var resolveElement = newResolveElement(index);
+                ++remainingElementsCount;
+                nextPromise.then(resolveElement, promiseCapability.@reject);
+            }
+        }
+    } catch (error) {
+        promiseCapability.@reject.@call(@undefined, error);
+    }
+
+    return promiseCapability.@promise;
+}