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LibJS: Implement Temporal.Calendar.prototype.mergeFields()
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@ -968,4 +968,92 @@ u8 iso_day(Object& temporal_object)
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VERIFY_NOT_REACHED();
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}
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// 12.1.45 DefaultMergeFields ( fields, additionalFields ), https://tc39.es/proposal-temporal/#sec-temporal-defaultmergefields
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Object* default_merge_fields(GlobalObject& global_object, Object& fields, Object& additional_fields)
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{
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auto& vm = global_object.vm();
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// 1. Let merged be ! OrdinaryObjectCreate(%Object.prototype%).
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auto* merged = Object::create(global_object, global_object.object_prototype());
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// 2. Let originalKeys be ? EnumerableOwnPropertyNames(fields, key).
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auto original_keys = fields.enumerable_own_property_names(Object::PropertyKind::Key);
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if (vm.exception())
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return {};
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// 3. For each element nextKey of originalKeys, do
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for (auto& next_key : original_keys) {
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// a. If nextKey is not "month" or "monthCode", then
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if (next_key.as_string().string() != vm.names.month.as_string() && next_key.as_string().string() != vm.names.monthCode.as_string()) {
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auto property_name = PropertyName::from_value(global_object, next_key);
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// i. Let propValue be ? Get(fields, nextKey).
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auto prop_value = fields.get(property_name);
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if (vm.exception())
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return {};
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// ii. If propValue is not undefined, then
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if (!prop_value.is_undefined()) {
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// 1. Perform ! CreateDataPropertyOrThrow(merged, nextKey, propValue).
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merged->create_data_property_or_throw(property_name, prop_value);
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}
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}
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}
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// 4. Let newKeys be ? EnumerableOwnPropertyNames(additionalFields, key).
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auto new_keys = additional_fields.enumerable_own_property_names(Object::PropertyKind::Key);
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if (vm.exception())
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return {};
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// IMPLEMENTATION DEFINED: This is an optimization, so we don't have to iterate new_keys three times (worst case), but only once.
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bool new_keys_contains_month_or_month_code_property = false;
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// 5. For each element nextKey of newKeys, do
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for (auto& next_key : new_keys) {
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auto property_name = PropertyName::from_value(global_object, next_key);
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// a. Let propValue be ? Get(additionalFields, nextKey).
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auto prop_value = additional_fields.get(property_name);
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if (vm.exception())
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return {};
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// b. If propValue is not undefined, then
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if (!prop_value.is_undefined()) {
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// i. Perform ! CreateDataPropertyOrThrow(merged, nextKey, propValue).
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merged->create_data_property_or_throw(property_name, prop_value);
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}
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// See comment above.
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new_keys_contains_month_or_month_code_property |= next_key.as_string().string() == vm.names.month.as_string() || next_key.as_string().string() == vm.names.monthCode.as_string();
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}
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// 6. If newKeys does not contain either "month" or "monthCode", then
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if (!new_keys_contains_month_or_month_code_property) {
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// a. Let month be ? Get(fields, "month").
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auto month = fields.get(vm.names.month);
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if (vm.exception())
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return {};
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// b. If month is not undefined, then
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if (!month.is_undefined()) {
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// i. Perform ! CreateDataPropertyOrThrow(merged, "month", month).
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merged->create_data_property_or_throw(vm.names.month, month);
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}
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// c. Let monthCode be ? Get(fields, "monthCode").
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auto month_code = fields.get(vm.names.monthCode);
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if (vm.exception())
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return {};
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// d. If monthCode is not undefined, then
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if (!month_code.is_undefined()) {
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// i. Perform ! CreateDataPropertyOrThrow(merged, "monthCode", monthCode).
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merged->create_data_property_or_throw(vm.names.monthCode, month_code);
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}
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}
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// 7. Return merged.
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return merged;
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}
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}
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