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LibJS: Implement Function.prototype.bind() according to the spec :^)

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Linus Groh 2022-02-09 19:41:23 +00:00
parent 87b9fa2636
commit 898ad7c682
4 changed files with 66 additions and 20 deletions
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34
Userland/Libraries/LibJS/Runtime/BoundFunction.cpp
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@ -11,23 +11,37 @@
namespace JS {
BoundFunction::BoundFunction(GlobalObject& global_object, FunctionObject& bound_target_function, Value bound_this, Vector<Value> bound_arguments, i32 length)
: FunctionObject(*global_object.function_prototype())
// 10.4.1.3 BoundFunctionCreate ( targetFunction, boundThis, boundArgs ), https://tc39.es/ecma262/multipage/ordinary-and-exotic-objects-behaviours.html#sec-boundfunctioncreate
ThrowCompletionOr<BoundFunction*> BoundFunction::create(GlobalObject& global_object, FunctionObject& target_function, Value bound_this, Vector<Value> bound_arguments)
{
// 1. Let proto be ? targetFunction.[[GetPrototypeOf]]().
auto* prototype = TRY(target_function.internal_get_prototype_of());
// 2. Let internalSlotsList be the list-concatenation of « [[Prototype]], [[Extensible]] » and the internal slots listed in Table 33.
// 3. Let obj be ! MakeBasicObject(internalSlotsList).
// 4. Set obj.[[Prototype]] to proto.
// 5. Set obj.[[Call]] as described in 10.4.1.1.
// 6. If IsConstructor(targetFunction) is true, then
// a. Set obj.[[Construct]] as described in 10.4.1.2.
// 7. Set obj.[[BoundTargetFunction]] to targetFunction.
// 8. Set obj.[[BoundThis]] to boundThis.
// 9. Set obj.[[BoundArguments]] to boundArgs.
auto* object = global_object.heap().allocate<BoundFunction>(global_object, global_object, target_function, bound_this, move(bound_arguments), prototype);
// 10. Return obj.
return object;
}
BoundFunction::BoundFunction(GlobalObject& global_object, FunctionObject& bound_target_function, Value bound_this, Vector<Value> bound_arguments, Object* prototype)
: FunctionObject(global_object, prototype)
, m_bound_target_function(&bound_target_function)
, m_bound_this(bound_this)
, m_bound_arguments(move(bound_arguments))
// FIXME: Non-standard and redundant, remove.
, m_name(String::formatted("bound {}", bound_target_function.name()))
, m_length(length)
{
}
void BoundFunction::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
Base::initialize(global_object);
define_direct_property(vm.names.length, Value(m_length), Attribute::Configurable);
}
BoundFunction::~BoundFunction()
{
}