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-rw-r--r--js/src/builtin/Utilities.js63
1 files changed, 63 insertions, 0 deletions
diff --git a/js/src/builtin/Utilities.js b/js/src/builtin/Utilities.js
index c73bc5e7f..ec5c88336 100644
--- a/js/src/builtin/Utilities.js
+++ b/js/src/builtin/Utilities.js
@@ -229,6 +229,69 @@ function GetInternalError(msg) {
// To be used when a function is required but calling it shouldn't do anything.
function NullFunction() {}
+// Object Rest/Spread Properties proposal
+// Abstract operation: CopyDataProperties (target, source, excluded)
+function CopyDataProperties(target, source, excluded) {
+ // Step 1.
+ assert(IsObject(target), "target is an object");
+
+ // Step 2.
+ assert(IsObject(excluded), "excluded is an object");
+
+ // Steps 3, 6.
+ if (source === undefined || source === null)
+ return;
+
+ // Step 4.a.
+ source = ToObject(source);
+
+ // Step 4.b.
+ var keys = OwnPropertyKeys(source, JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS);
+
+ // Step 5.
+ for (var index = 0; index < keys.length; index++) {
+ var key = keys[index];
+
+ // We abbreviate this by calling propertyIsEnumerable which is faster
+ // and returns false for not defined properties.
+ if (!callFunction(std_Object_hasOwnProperty, key, excluded) && callFunction(std_Object_propertyIsEnumerable, source, key))
+ _DefineDataProperty(target, key, source[key]);
+ }
+
+ // Step 6 (Return).
+}
+
+// Object Rest/Spread Properties proposal
+// Abstract operation: CopyDataProperties (target, source, excluded)
+function CopyDataPropertiesUnfiltered(target, source) {
+ // Step 1.
+ assert(IsObject(target), "target is an object");
+
+ // Step 2 (Not applicable).
+
+ // Steps 3, 6.
+ if (source === undefined || source === null)
+ return;
+
+ // Step 4.a.
+ source = ToObject(source);
+
+ // Step 4.b.
+ var keys = OwnPropertyKeys(source, JSITER_OWNONLY | JSITER_HIDDEN | JSITER_SYMBOLS);
+
+ // Step 5.
+ for (var index = 0; index < keys.length; index++) {
+ var key = keys[index];
+
+ // We abbreviate this by calling propertyIsEnumerable which is faster
+ // and returns false for not defined properties.
+ if (callFunction(std_Object_propertyIsEnumerable, source, key))
+ _DefineDataProperty(target, key, source[key]);
+ }
+
+ // Step 6 (Return).
+}
+
/*************************************** Testing functions ***************************************/
function outer() {
return function inner() {