b84f8fb55b
Some of these are allocated upon initialization of the intrinsics, and some lazily, but in neither case the getters actually return a nullptr. This saves us a whole bunch of pointer dereferences (as NonnullGCPtr has an `operator T&()`), and also has the interesting side effect of forcing us to explicitly use the FunctionObject& overload of call(), as passing a NonnullGCPtr is ambigous - it could implicitly be turned into a Value _or_ a FunctionObject& (so we have to dereference manually).
105 lines
4.1 KiB
C++
105 lines
4.1 KiB
C++
/*
|
|
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#include <AK/Checked.h>
|
|
#include <AK/TypeCasts.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(realm.vm().names.DataView.as_string(), realm.intrinsics().function_prototype())
|
|
{
|
|
}
|
|
|
|
ThrowCompletionOr<void> DataViewConstructor::initialize(Realm& realm)
|
|
{
|
|
auto& vm = this->vm();
|
|
MUST_OR_THROW_OOM(NativeFunction::initialize(realm));
|
|
|
|
// 25.3.3.1 DataView.prototype, https://tc39.es/ecma262/#sec-dataview.prototype
|
|
define_direct_property(vm.names.prototype, realm.intrinsics().data_view_prototype(), 0);
|
|
|
|
define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
|
|
|
|
return {};
|
|
}
|
|
|
|
// 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();
|
|
|
|
// 1. If NewTarget is undefined, throw a TypeError exception.
|
|
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<NonnullGCPtr<Object>> DataViewConstructor::construct(FunctionObject& new_target)
|
|
{
|
|
auto& vm = this->vm();
|
|
|
|
auto buffer = vm.argument(0);
|
|
auto byte_offset = vm.argument(1);
|
|
auto byte_length = vm.argument(2);
|
|
|
|
// 2. Perform ? RequireInternalSlot(buffer, [[ArrayBufferData]]).
|
|
if (!buffer.is_object() || !is<ArrayBuffer>(buffer.as_object()))
|
|
return vm.throw_completion<TypeError>(ErrorType::IsNotAn, TRY_OR_THROW_OOM(vm, buffer.to_string_without_side_effects()), vm.names.ArrayBuffer);
|
|
|
|
auto& array_buffer = static_cast<ArrayBuffer&>(buffer.as_object());
|
|
|
|
// 3. Let offset be ? ToIndex(byteOffset).
|
|
auto offset = TRY(byte_offset.to_index(vm));
|
|
|
|
// 4. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
|
|
if (array_buffer.is_detached())
|
|
return vm.throw_completion<TypeError>(ErrorType::DetachedArrayBuffer);
|
|
|
|
// 5. Let bufferByteLength be buffer.[[ArrayBufferByteLength]].
|
|
auto buffer_byte_length = array_buffer.byte_length();
|
|
|
|
// 6. If offset > bufferByteLength, throw a RangeError exception.
|
|
if (offset > buffer_byte_length)
|
|
return vm.throw_completion<RangeError>(ErrorType::DataViewOutOfRangeByteOffset, offset, buffer_byte_length);
|
|
|
|
size_t view_byte_length;
|
|
|
|
// 7. If byteLength is undefined, then
|
|
if (byte_length.is_undefined()) {
|
|
// a. Let viewByteLength be bufferByteLength - offset.
|
|
view_byte_length = buffer_byte_length - offset;
|
|
}
|
|
// 8. Else,
|
|
else {
|
|
// a. Let viewByteLength be ? ToIndex(byteLength).
|
|
view_byte_length = TRY(byte_length.to_index(vm));
|
|
|
|
// b. If offset + viewByteLength > bufferByteLength, throw a RangeError exception.
|
|
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);
|
|
}
|
|
|
|
// 9. Let O be ? OrdinaryCreateFromConstructor(NewTarget, "%DataView.prototype%", « [[DataView]], [[ViewedArrayBuffer]], [[ByteLength]], [[ByteOffset]] »).
|
|
// 11. Set O.[[ViewedArrayBuffer]] to buffer.
|
|
// 12. Set O.[[ByteLength]] to viewByteLength.
|
|
// 13. Set O.[[ByteOffset]] to offset.
|
|
auto data_view = TRY(ordinary_create_from_constructor<DataView>(vm, new_target, &Intrinsics::data_view_prototype, &array_buffer, view_byte_length, offset));
|
|
|
|
// 10. If IsDetachedBuffer(buffer) is true, throw a TypeError exception.
|
|
if (array_buffer.is_detached())
|
|
return vm.throw_completion<TypeError>(ErrorType::DetachedArrayBuffer);
|
|
|
|
// 14. Return O.
|
|
return data_view;
|
|
}
|
|
|
|
}
|