webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 114 insertions, 0 deletions

diff --git a/Source/JavaScriptCore/builtins/ArrayConstructor.js b/Source/JavaScriptCore/builtins/ArrayConstructor.js
new file mode 100644
index 000000000..73add1a70
--- /dev/null
+++ b/Source/JavaScriptCore/builtins/ArrayConstructor.js
@@ -0,0 +1,114 @@
+/*
+ * Copyright (C) 2015, 2016 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 of(/* items... */)
+{
+    "use strict";
+
+    var length = arguments.length;
+    var array = @isConstructor(this) ? new this(length) : @newArrayWithSize(length);
+    for (var k = 0; k < length; ++k)
+        @putByValDirect(array, k, arguments[k]);
+    array.length = length;
+    return array;
+}
+
+function from(items /*, mapFn, thisArg */)
+{
+    "use strict";
+
+    var thisObj = this;
+
+    var mapFn = @argument(1);
+
+    var thisArg;
+
+    if (mapFn !== @undefined) {
+        if (typeof mapFn !== "function")
+            @throwTypeError("Array.from requires that the second argument, when provided, be a function");
+
+        thisArg = @argument(2);
+    }
+
+    if (items == null)
+        @throwTypeError("Array.from requires an array-like object - not null or undefined");
+
+    var iteratorMethod = items.@iteratorSymbol;
+    if (iteratorMethod != null) {
+        if (typeof iteratorMethod !== "function")
+            @throwTypeError("Array.from requires that the property of the first argument, items[Symbol.iterator], when exists, be a function");
+
+        var result = @isConstructor(thisObj) ? new thisObj() : [];
+
+        var k = 0;
+        var iterator = iteratorMethod.@call(items);
+
+        // Since for-of loop once more looks up the @@iterator property of a given iterable,
+        // it could be observable if the user defines a getter for @@iterator.
+        // To avoid this situation, we define a wrapper object that @@iterator just returns a given iterator.
+        var wrapper = {}
+        wrapper.@iteratorSymbol = function() { return iterator; };
+
+        for (var value of wrapper) {
+            if (mapFn)
+                @putByValDirect(result, k, thisArg === @undefined ? mapFn(value, k) : mapFn.@call(thisArg, value, k));
+            else
+                @putByValDirect(result, k, value);
+            k += 1;
+        }
+
+        result.length = k;
+        return result;
+    }
+
+    var arrayLike = @Object(items);
+    var arrayLikeLength = @toLength(arrayLike.length);
+
+    var result = @isConstructor(thisObj) ? new thisObj(arrayLikeLength) : @newArrayWithSize(arrayLikeLength);
+
+    var k = 0;
+    while (k < arrayLikeLength) {
+        var value = arrayLike[k];
+        if (mapFn)
+            @putByValDirect(result, k, thisArg === @undefined ? mapFn(value, k) : mapFn.@call(thisArg, value, k));
+        else
+            @putByValDirect(result, k, value);
+        k += 1;
+    }
+
+    result.length = arrayLikeLength;
+    return result;
+}
+
+function isArray(array)
+{
+    "use strict";
+
+    if (@isJSArray(array) || @isDerivedArray(array))
+        return true;
+    if (!@isProxyObject(array))
+        return false;
+    return @isArraySlow(array);
+}