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LibJS: Implement excluded values in CopyDataProperties

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This is a change to this AO as part of the Temporal proposal.
This commit is contained in:
Shannon Booth 2024-01-04 19:52:46 +13:00 • committed by Andrew Kaster
parent a504d76b14
commit 107fa1fdb8
Notes: sideshowbarker 2024-07-17 04:10:16 +09:00
2 changed files with 13 additions and 6 deletions
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17
Userland/Libraries/LibJS/Runtime/Object.cpp
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@ -438,7 +438,8 @@ ThrowCompletionOr<MarkedVector<Value>> Object::enumerable_own_property_names(Pro
}
// 7.3.26 CopyDataProperties ( target, source, excludedItems ), https://tc39.es/ecma262/#sec-copydataproperties
ThrowCompletionOr<void> Object::copy_data_properties(VM& vm, Value source, HashTable<PropertyKey> const& seen_names)
// 14.6 CopyDataProperties ( target, source, excludedItems, excludedKeys [ , excludedValues ] ), https://tc39.es/proposal-temporal/#sec-copydataproperties
ThrowCompletionOr<void> Object::copy_data_properties(VM& vm, Value source, HashTable<PropertyKey> const& excluded_keys, HashTable<JS::Value> const& excluded_values)
{
// 1. If source is either undefined or null, return unused.
if (source.is_nullish())
@ -455,10 +456,10 @@ ThrowCompletionOr<void> Object::copy_data_properties(VM& vm, Value source, HashT
auto next_key = MUST(PropertyKey::from_value(vm, next_key_value));
// a. Let excluded be false.
// b. For each element e of excludedItems, do
// b. For each element e of excludedKeys, do
// i. If SameValue(e, nextKey) is true, then
// 1. Set excluded to true.
if (seen_names.contains(next_key))
if (excluded_keys.contains(next_key))
continue;
// c. If excluded is false, then
@ -471,8 +472,14 @@ ThrowCompletionOr<void> Object::copy_data_properties(VM& vm, Value source, HashT
// 1. Let propValue be ? Get(from, nextKey).
auto prop_value = TRY(from->get(next_key));
// 2. Perform ! CreateDataPropertyOrThrow(target, nextKey, propValue).
MUST(create_data_property_or_throw(next_key, prop_value));
// 2. If excludedValues is present, then
// a. For each element e of excludedValues, do
// i. If SameValue(e, propValue) is true, then
// i. Set excluded to true.
// 3. If excluded is false, Perform ! CreateDataPropertyOrThrow(target, nextKey, propValue).
// NOTE: HashTable traits for JS::Value uses SameValue.
if (!excluded_values.contains(prop_value))
MUST(create_data_property_or_throw(next_key, prop_value));
}
}

2
Userland/Libraries/LibJS/Runtime/Object.h
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@ -118,7 +118,7 @@ public:
ThrowCompletionOr<bool> set_integrity_level(IntegrityLevel);
ThrowCompletionOr<bool> test_integrity_level(IntegrityLevel) const;
ThrowCompletionOr<MarkedVector<Value>> enumerable_own_property_names(PropertyKind kind) const;
ThrowCompletionOr<void> copy_data_properties(VM&, Value source, HashTable<PropertyKey> const& seen_names);
ThrowCompletionOr<void> copy_data_properties(VM&, Value source, HashTable<PropertyKey> const& excluded_keys, HashTable<JS::Value> const& excluded_values = {});
PrivateElement* private_element_find(PrivateName const& name);
ThrowCompletionOr<void> private_field_add(PrivateName const& name, Value value);