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/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Checked.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/DataView.h>
#include <LibJS/Runtime/DataViewConstructor.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
namespace JS {
DataViewConstructor::DataViewConstructor(Realm& realm)
: NativeFunction(vm().names.DataView.as_string(), *realm.global_object().function_prototype())
{
}
void DataViewConstructor::initialize(Realm& realm)
{
auto& vm = this->vm();
NativeFunction::initialize(realm);
// 25.3.3.1 DataView.prototype, https://tc39.es/ecma262/#sec-dataview.prototype
define_direct_property(vm.names.prototype, realm.global_object().data_view_prototype(), 0);
define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
}
// 25.3.2.1 DataView ( buffer [ , byteOffset [ , byteLength ] ] ), https://tc39.es/ecma262/#sec-dataview-buffer-byteoffset-bytelength
ThrowCompletionOr<Value> DataViewConstructor::call()
{
auto& vm = this->vm();
return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.DataView);
}
// 25.3.2.1 DataView ( buffer [ , byteOffset [ , byteLength ] ] ), https://tc39.es/ecma262/#sec-dataview-buffer-byteoffset-bytelength
ThrowCompletionOr<Object*> DataViewConstructor::construct(FunctionObject& new_target)
{
auto& vm = this->vm();
auto& global_object = this->global_object();
auto buffer = vm.argument(0);
if (!buffer.is_object() || !is<ArrayBuffer>(buffer.as_object()))
return vm.throw_completion<TypeError>(ErrorType::IsNotAn, buffer.to_string_without_side_effects(), vm.names.ArrayBuffer);
auto& array_buffer = static_cast<ArrayBuffer&>(buffer.as_object());
auto offset = TRY(vm.argument(1).to_index(vm));
if (array_buffer.is_detached())
return vm.throw_completion<TypeError>(ErrorType::DetachedArrayBuffer);
auto buffer_byte_length = array_buffer.byte_length();
if (offset > buffer_byte_length)
return vm.throw_completion<RangeError>(ErrorType::DataViewOutOfRangeByteOffset, offset, buffer_byte_length);
size_t view_byte_length;
if (vm.argument(2).is_undefined()) {
view_byte_length = buffer_byte_length - offset;
} else {
view_byte_length = TRY(vm.argument(2).to_index(vm));
auto const checked_add = AK::make_checked(view_byte_length) + AK::make_checked(offset);
if (checked_add.has_overflow() || checked_add.value() > buffer_byte_length)
return vm.throw_completion<RangeError>(ErrorType::InvalidLength, vm.names.DataView);
}
auto* data_view = TRY(ordinary_create_from_constructor<DataView>(global_object, new_target, &GlobalObject::data_view_prototype, &array_buffer, view_byte_length, offset));
if (array_buffer.is_detached())
return vm.throw_completion<TypeError>(ErrorType::DetachedArrayBuffer);
return data_view;
}
}
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