JavaScriptCore-7601.1.46.3.tar.gz

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

diff --git a/builtins/ObjectConstructor.js b/builtins/ObjectConstructor.js
new file mode 100644 (file)
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--- /dev/null
+++ b/builtins/ObjectConstructor.js
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2015 Jordan Harband. 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 assign(target/*[*/, /*...*/sources/*] */) {
+    "use strict";
+
+    if (target == null)
+        throw new @TypeError("can't convert " + target + " to object");
+
+    var objTarget = @Object(target);
+    var s, nextSource, from, i, keys, nextKey, desc;
+    for (s = 1; s < arguments.length; ++s) {
+        nextSource = arguments[s];
+        if (nextSource != null) {
+            from = @Object(nextSource);
+            // TODO: replace @objectKeys + @objectGetOwnPropertySymbols with single @OwnPropertyKeys c++ operation
+            keys = @objectKeys(from);
+            for (i = 0; i < keys.length; ++i) {
+                nextKey = keys[i];
+                desc = @objectGetOwnPropertyDescriptor(from, nextKey);
+                if (typeof desc !== "undefined" && desc.enumerable) {
+                    objTarget[nextKey] = from[nextKey];
+                }
+            }
+            keys = @objectGetOwnPropertySymbols(from);
+            for (i = 0; i < keys.length; ++i) {
+                nextKey = keys[i];
+                desc = @objectGetOwnPropertyDescriptor(from, nextKey);
+                if (typeof desc !== "undefined" && desc.enumerable) {
+                    objTarget[nextKey] = from[nextKey];
+                }
+            }
+        }
+    }
+    return objTarget;
+}