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LibJS: Add spec comments to instance_of()

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Linus Groh 2022-12-10 00:09:44 +00:00
parent d74ce90e74
commit 0b35c24c9c
1 changed files with 19 additions and 10 deletions
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29
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -2019,18 +2019,27 @@ ThrowCompletionOr<Value> in(VM& vm, Value lhs, Value rhs)
}
// 13.10.2 InstanceofOperator ( V, target ), https://tc39.es/ecma262/#sec-instanceofoperator
ThrowCompletionOr<Value> instance_of(VM& vm, Value lhs, Value rhs)
ThrowCompletionOr<Value> instance_of(VM& vm, Value value, Value target)
{
if (!rhs.is_object())
return vm.throw_completion<TypeError>(ErrorType::NotAnObject, rhs.to_string_without_side_effects());
auto has_instance_method = TRY(rhs.get_method(vm, *vm.well_known_symbol_has_instance()));
if (has_instance_method) {
auto has_instance_result = TRY(call(vm, *has_instance_method, rhs, lhs));
return Value(has_instance_result.to_boolean());
// 1. If target is not an Object, throw a TypeError exception.
if (!target.is_object())
return vm.throw_completion<TypeError>(ErrorType::NotAnObject, target.to_string_without_side_effects());
// 2. Let instOfHandler be ? GetMethod(target, @@hasInstance).
auto* instance_of_handler = TRY(target.get_method(vm, *vm.well_known_symbol_has_instance()));
// 3. If instOfHandler is not undefined, then
if (instance_of_handler) {
// a. Return ToBoolean(? Call(instOfHandler, target, « V »)).
return Value(TRY(call(vm, *instance_of_handler, target, value)).to_boolean());
}
if (!rhs.is_function())
return vm.throw_completion<TypeError>(ErrorType::NotAFunction, rhs.to_string_without_side_effects());
return TRY(ordinary_has_instance(vm, lhs, rhs));
// 4. If IsCallable(target) is false, throw a TypeError exception.
if (!target.is_function())
return vm.throw_completion<TypeError>(ErrorType::NotAFunction, target.to_string_without_side_effects());
// 5. Return ? OrdinaryHasInstance(target, V).
return ordinary_has_instance(vm, target, value);
}
// 7.3.22 OrdinaryHasInstance ( C, O ), https://tc39.es/ecma262/#sec-ordinaryhasinstance