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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
*/
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Completion.h>
#include <LibJS/Runtime/FunctionObject.h>
namespace JS {
FunctionObject::FunctionObject(GlobalObject& global_object, Object* prototype)
: Object(global_object, prototype)
{
}
FunctionObject::FunctionObject(Object& prototype)
: Object(prototype)
{
}
// 10.2.9 SetFunctionName ( F, name [ , prefix ] ), https://tc39.es/ecma262/#sec-setfunctionname
void FunctionObject::set_function_name(Variant<PropertyKey, PrivateName> const& name_arg, Optional<StringView> const& prefix)
{
auto& vm = this->vm();
// 1. Assert: F is an extensible object that does not have a "name" own property.
VERIFY(m_is_extensible);
VERIFY(!storage_has(vm.names.name));
String name;
// 2. If Type(name) is Symbol, then
if (auto const* property_key = name_arg.get_pointer<PropertyKey>(); property_key && property_key->is_symbol()) {
// a. Let description be name's [[Description]] value.
auto const& description = property_key->as_symbol()->raw_description();
// b. If description is undefined, set name to the empty String.
if (!description.has_value())
name = String::empty();
// c. Else, set name to the string-concatenation of "[", description, and "]".
else
name = String::formatted("[{}]", *description);
}
// 3. Else if name is a Private Name, then
else if (auto const* private_name = name_arg.get_pointer<PrivateName>()) {
// a. Set name to name.[[Description]].
name = private_name->description;
}
// NOTE: This is necessary as we use a different parameter name.
else {
name = name_arg.get<PropertyKey>().to_string();
}
// 4. If F has an [[InitialName]] internal slot, then
if (is<NativeFunction>(this)) {
// a. Set F.[[InitialName]] to name.
static_cast<NativeFunction&>(*this).set_initial_name({}, name);
}
// 5. If prefix is present, then
if (prefix.has_value()) {
// a. Set name to the string-concatenation of prefix, the code unit 0x0020 (SPACE), and name.
name = String::formatted("{} {}", *prefix, name);
// b. If F has an [[InitialName]] internal slot, then
if (is<NativeFunction>(this)) {
// i. Optionally, set F.[[InitialName]] to name.
static_cast<NativeFunction&>(*this).set_initial_name({}, name);
}
}
// 6. Perform ! DefinePropertyOrThrow(F, "name", PropertyDescriptor { [[Value]]: name, [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
MUST(define_property_or_throw(vm.names.name, PropertyDescriptor { .value = js_string(vm, move(name)), .writable = false, .enumerable = false, .configurable = true }));
// 7. Return unused.
}
// 10.2.10 SetFunctionLength ( F, length ), https://tc39.es/ecma262/#sec-setfunctionlength
void FunctionObject::set_function_length(double length)
{
auto& vm = this->vm();
// "length (a non-negative integer or +∞)"
VERIFY(trunc(length) == length || __builtin_isinf_sign(length) == 1);
// 1. Assert: F is an extensible object that does not have a "length" own property.
VERIFY(m_is_extensible);
VERIFY(!storage_has(vm.names.length));
// 2. Perform ! DefinePropertyOrThrow(F, "length", PropertyDescriptor { [[Value]]: 𝔽(length), [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true }).
MUST(define_property_or_throw(vm.names.length, PropertyDescriptor { .value = Value { length }, .writable = false, .enumerable = false, .configurable = true }));
// 3. Return unused.
}
}
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