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LibJS: Add the DataView built-in object

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Idan Horowitz 2021-06-14 01:47:08 +03:00 • committed by Linus Groh
parent 5b2255291e
commit e4d267d4fb
15 changed files with 351 additions and 0 deletions
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90
Userland/Libraries/LibJS/Runtime/DataViewConstructor.cpp Normal file
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/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibJS/Runtime/DataView.h>
#include <LibJS/Runtime/DataViewConstructor.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
namespace JS {
DataViewConstructor::DataViewConstructor(GlobalObject& global_object)
: NativeFunction(vm().names.DataView, *global_object.function_prototype())
{
}
void DataViewConstructor::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
NativeFunction::initialize(global_object);
// 25.3.3.1 DataView.prototype, https://tc39.es/ecma262/#sec-dataview.prototype
define_property(vm.names.prototype, global_object.data_view_prototype(), 0);
define_property(vm.names.length, Value(1), Attribute::Configurable);
}
DataViewConstructor::~DataViewConstructor()
{
}
// 25.3.2.1 DataView ( buffer [ , byteOffset [ , byteLength ] ] ), https://tc39.es/ecma262/#sec-dataview-buffer-byteoffset-bytelength
Value DataViewConstructor::call()
{
auto& vm = this->vm();
vm.throw_exception<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, vm.names.DataView);
return {};
}
// 25.3.2.1 DataView ( buffer [ , byteOffset [ , byteLength ] ] ), https://tc39.es/ecma262/#sec-dataview-buffer-byteoffset-bytelength
Value DataViewConstructor::construct(Function&)
{
auto& vm = this->vm();
auto buffer = vm.argument(0);
if (!buffer.is_object() || !is<ArrayBuffer>(buffer.as_object())) {
vm.throw_exception<TypeError>(global_object(), ErrorType::IsNotAn, buffer.to_string_without_side_effects(), vm.names.ArrayBuffer);
return {};
}
auto& array_buffer = static_cast<ArrayBuffer&>(buffer.as_object());
auto offset = vm.argument(1).to_index(global_object());
if (vm.exception())
return {};
if (array_buffer.is_detached()) {
vm.throw_exception<TypeError>(global_object(), ErrorType::DetachedArrayBuffer);
return {};
}
auto buffer_byte_length = array_buffer.byte_length();
if (offset > buffer_byte_length) {
vm.throw_exception<RangeError>(global_object(), ErrorType::DataViewOutOfRangeByteOffset, offset, buffer_byte_length);
return {};
}
size_t view_byte_length;
if (vm.argument(2).is_undefined()) {
view_byte_length = buffer_byte_length - offset;
} else {
view_byte_length = vm.argument(2).to_index(global_object());
if (vm.exception())
return {};
if (offset + view_byte_length > buffer_byte_length) {
vm.throw_exception<RangeError>(global_object(), ErrorType::InvalidLength, vm.names.DataView);
return {};
}
}
// FIXME: Use OrdinaryCreateFromConstructor(newTarget, "%DataView.prototype%")
if (array_buffer.is_detached()) {
vm.throw_exception<TypeError>(global_object(), ErrorType::DetachedArrayBuffer);
return {};
}
return DataView::create(global_object(), &array_buffer, view_byte_length, offset);
}
}