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LibJS: Add spec comments to ArrayBufferConstructor

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This commit is contained in:
Linus Groh 2023-01-27 21:25:31 +00:00
parent 039cd353f1
commit eefb73add2
Notes: sideshowbarker 2024-07-17 16:42:19 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/eefb73add2
Pull-request: https://github.com/SerenityOS/serenity/pull/17209
1 changed files with 14 additions and 1 deletions
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15
Userland/Libraries/LibJS/Runtime/ArrayBufferConstructor.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2020-2022, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2020-2023, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -40,6 +40,8 @@ void ArrayBufferConstructor::initialize(Realm& realm)
ThrowCompletionOr<Value> ArrayBufferConstructor::call()
{
auto& vm = this->vm();
// 1. If NewTarget is undefined, throw a TypeError exception.
return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.ArrayBuffer);
}
@ -47,6 +49,8 @@ ThrowCompletionOr<Value> ArrayBufferConstructor::call()
ThrowCompletionOr<NonnullGCPtr<Object>> ArrayBufferConstructor::construct(FunctionObject& new_target)
{
auto& vm = this->vm();
// 2. Let byteLength be ? ToIndex(length).
auto byte_length_or_error = vm.argument(0).to_index(vm);
if (byte_length_or_error.is_error()) {
@ -57,6 +61,8 @@ ThrowCompletionOr<NonnullGCPtr<Object>> ArrayBufferConstructor::construct(Functi
}
return error;
}
// 3. Return ? AllocateArrayBuffer(NewTarget, byteLength).
return *TRY(allocate_array_buffer(vm, new_target, byte_length_or_error.release_value()));
}
@ -64,18 +70,25 @@ ThrowCompletionOr<NonnullGCPtr<Object>> ArrayBufferConstructor::construct(Functi
JS_DEFINE_NATIVE_FUNCTION(ArrayBufferConstructor::is_view)
{
auto arg = vm.argument(0);
// 1. If arg is not an Object, return false.
if (!arg.is_object())
return Value(false);
// 2. If arg has a [[ViewedArrayBuffer]] internal slot, return true.
if (arg.as_object().is_typed_array())
return Value(true);
if (is<DataView>(arg.as_object()))
return Value(true);
// 3. Return false.
return Value(false);
}
// 25.1.4.3 get ArrayBuffer [ @@species ], https://tc39.es/ecma262/#sec-get-arraybuffer-@@species
JS_DEFINE_NATIVE_FUNCTION(ArrayBufferConstructor::symbol_species_getter)
{
// 1. Return the this value.
return vm.this_value();
}