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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Badge.h>
#include <AK/Function.h>
#include <AK/Optional.h>
#include <LibJS/Runtime/Completion.h>
#include <LibJS/Runtime/FunctionObject.h>
#include <LibJS/Runtime/PropertyKey.h>
namespace JS {
class NativeFunction : public FunctionObject {
JS_OBJECT(NativeFunction, FunctionObject);
public:
static NativeFunction* create(Realm&, Function<ThrowCompletionOr<Value>(VM&, GlobalObject&)> behaviour, i32 length, PropertyKey const& name, Optional<Realm*> = {}, Optional<Object*> prototype = {}, Optional<StringView> const& prefix = {});
static NativeFunction* create(Realm&, FlyString const& name, Function<ThrowCompletionOr<Value>(VM&, GlobalObject&)>);
NativeFunction(Function<ThrowCompletionOr<Value>(VM&, GlobalObject&)>, Object* prototype, Realm& realm);
NativeFunction(FlyString name, Function<ThrowCompletionOr<Value>(VM&, GlobalObject&)>, Object& prototype);
virtual void initialize(Realm&) override { }
virtual ~NativeFunction() override = default;
virtual ThrowCompletionOr<Value> internal_call(Value this_argument, MarkedVector<Value> arguments_list) override;
virtual ThrowCompletionOr<Object*> internal_construct(MarkedVector<Value> arguments_list, FunctionObject& new_target) override;
// Used for [[Call]] / [[Construct]]'s "...result of evaluating F in a manner that conforms to the specification of F".
// Needs to be overridden by all NativeFunctions without an m_native_function.
virtual ThrowCompletionOr<Value> call();
virtual ThrowCompletionOr<Object*> construct(FunctionObject& new_target);
virtual FlyString const& name() const override { return m_name; };
virtual bool is_strict_mode() const override;
virtual bool has_constructor() const override { return false; }
virtual Realm* realm() const override { return m_realm; }
Optional<FlyString> const& initial_name() const { return m_initial_name; }
void set_initial_name(Badge<FunctionObject>, FlyString initial_name) { m_initial_name = move(initial_name); }
protected:
NativeFunction(FlyString name, Object& prototype);
explicit NativeFunction(Object& prototype);
private:
virtual bool is_native_function() const final { return true; }
FlyString m_name;
Optional<FlyString> m_initial_name; // [[InitialName]]
Function<ThrowCompletionOr<Value>(VM&, GlobalObject&)> m_native_function;
Realm* m_realm { nullptr };
};
template<>
inline bool Object::fast_is<NativeFunction>() const { return is_native_function(); }
}
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