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LibJS: Implement the GetMethod() abstract operation as a Value method

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This was a standalone function previously (get_method()), but instead of
passing a Value to it, we can just make it a method.

Also add spec step comments and fix the receiver value by using GetV().
This commit is contained in:
Linus Groh 2021-06-26 19:24:35 +01:00
parent 31f5797e89
commit 337ad6d15c
8 changed files with 48 additions and 41 deletions
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30
Userland/Libraries/LibJS/Runtime/Value.cpp
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@ -413,7 +413,7 @@ Value Value::to_primitive(GlobalObject& global_object, PreferredType preferred_t
};
if (is_object()) {
auto& vm = global_object.vm();
auto to_primitive_method = get_method(global_object, *this, *vm.well_known_symbol_to_primitive());
auto to_primitive_method = get_method(global_object, *vm.well_known_symbol_to_primitive());
if (vm.exception())
return {};
if (to_primitive_method) {
@ -805,6 +805,32 @@ Value Value::get(GlobalObject& global_object, PropertyName const& property_name)
return object->get(property_name, *this);
}
// 7.3.10 GetMethod ( V, P ), https://tc39.es/ecma262/#sec-getmethod
Function* Value::get_method(GlobalObject& global_object, PropertyName const& property_name) const
{
auto& vm = global_object.vm();
// 1. Assert: IsPropertyKey(P) is true.
// 2. Let func be ? GetV(V, P).
auto function = get(global_object, property_name).value_or(js_undefined());
if (vm.exception())
return nullptr;
// 3. If func is either undefined or null, return undefined.
if (function.is_nullish())
return nullptr;
// 4. If IsCallable(func) is false, throw a TypeError exception.
if (!function.is_function()) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotAFunction, function.to_string_without_side_effects());
return nullptr;
}
// 5. Return func.
return &function.as_function();
}
// 13.10 Relational Operators, https://tc39.es/ecma262/#sec-relational-operators
Value greater_than(GlobalObject& global_object, Value lhs, Value rhs)
{
@ -1204,7 +1230,7 @@ Value instance_of(GlobalObject& global_object, Value lhs, Value rhs)
vm.throw_exception<TypeError>(global_object, ErrorType::NotAnObject, rhs.to_string_without_side_effects());
return {};
}
auto has_instance_method = get_method(global_object, Value(&rhs.as_object()), *vm.well_known_symbol_has_instance());
auto has_instance_method = rhs.get_method(global_object, *vm.well_known_symbol_has_instance());
if (vm.exception())
return {};
if (has_instance_method) {