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// Copyright 2023 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
namespace collections {
// https://tc39.es/proposal-set-methods/#sec-set.prototype.union
transitioning javascript builtin SetPrototypeUnion(
js-implicit context: NativeContext, receiver: JSAny)(other: JSAny): JSSet {
const methodName: constexpr string = 'Set.prototype.union';
const fastIteratorResultMap = GetIteratorResultMap();
// 1. Let O be the this value.
// 2. Perform ? RequireInternalSlot(O, [[SetData]]).
const o = Cast<JSSet>(receiver) otherwise
ThrowTypeError(
MessageTemplate::kIncompatibleMethodReceiver, methodName, receiver);
// 3. Let otherRec be ? GetSetRecord(other).
let otherRec = GetSetRecord(other, methodName);
const table = Cast<OrderedHashSet>(o.table) otherwise unreachable;
// 5. Let resultSetData be a copy of O.[[SetData]].
let resultSetData = Cast<OrderedHashSet>(CloneFixedArray(
table, ExtractFixedArrayFlag::kFixedArrays)) otherwise unreachable;
try {
typeswitch (other) {
case (otherSet: JSSetWithNoCustomIteration): {
CheckSetRecordHasJSSetMethods(otherRec) otherwise SlowPath;
const otherTable =
Cast<OrderedHashSet>(otherSet.table) otherwise unreachable;
let otherIterator =
collections::NewUnmodifiedOrderedHashSetIterator(otherTable);
while (true) {
const nextValue = otherIterator.Next() otherwise Done;
resultSetData = AddToSetTable(resultSetData, nextValue, methodName);
}
}
case (otherMap: JSMapWithNoCustomIteration): {
CheckSetRecordHasJSMapMethods(otherRec) otherwise SlowPath;
const otherTable =
Cast<OrderedHashMap>(otherMap.table) otherwise unreachable;
let otherIterator =
collections::NewUnmodifiedOrderedHashMapIterator(otherTable);
while (true) {
const nextValue = otherIterator.Next() otherwise Done;
resultSetData =
AddToSetTable(resultSetData, nextValue.key, methodName);
}
}
case (JSAny): {
goto SlowPath;
}
}
} label SlowPath {
// 4. Let keysIter be ? GetKeysIterator(otherRec).
let keysIter =
GetKeysIterator(otherRec.object, UnsafeCast<Callable>(otherRec.keys));
// 6. Let next be true.
let nextRecord: JSReceiver;
// 7. Repeat, while next is not false,
while (true) {
// a. Set next to ? IteratorStep(keysIter).
nextRecord = iterator::IteratorStep(keysIter, fastIteratorResultMap)
otherwise Done;
// b. If next is not false, then
// i. Let nextValue be ? IteratorValue(next).
const nextValue =
iterator::IteratorValue(nextRecord, fastIteratorResultMap);
// ii. If nextValue is -0𝔽, set nextValue to +0𝔽.
// iii. If SetDataHas(resultSetData, nextValue) is false, then
// 1. Append nextValue to resultSetData.
resultSetData = AddToSetTable(resultSetData, nextValue, methodName);
}
} label Done {
// 8. Let result be
// OrdinaryObjectCreate(%Set.prototype%, « [[SetData]]»).
// 9. Set result.[[SetData]] to resultSetData.
// 10. Return result.
return new JSSet{
map: *NativeContextSlot(ContextSlot::JS_SET_MAP_INDEX),
properties_or_hash: kEmptyFixedArray,
elements: kEmptyFixedArray,
table: resultSetData
};
}
unreachable;
}
}
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