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https://github.com/LadybirdBrowser/ladybird.git
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f3117d46dc
This is a continuation of the previous five commits. A first big step into the direction of no longer having to pass a realm (or currently, a global object) trough layers upon layers of AOs! Unlike the create() APIs we can safely assume that this is only ever called when a running execution context and therefore current realm exists. If not, you can always manually allocate the Error and put it in a Completion :^) In the spec, throw exceptions implicitly use the current realm's intrinsics as well: https://tc39.es/ecma262/#sec-throw-an-exception
78 lines
3 KiB
C++
78 lines
3 KiB
C++
/*
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Checked.h>
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/DataView.h>
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#include <LibJS/Runtime/DataViewConstructor.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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namespace JS {
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DataViewConstructor::DataViewConstructor(Realm& realm)
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: NativeFunction(vm().names.DataView.as_string(), *realm.global_object().function_prototype())
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{
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}
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void DataViewConstructor::initialize(Realm& realm)
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{
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auto& vm = this->vm();
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NativeFunction::initialize(realm);
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// 25.3.3.1 DataView.prototype, https://tc39.es/ecma262/#sec-dataview.prototype
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define_direct_property(vm.names.prototype, realm.global_object().data_view_prototype(), 0);
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define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
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}
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// 25.3.2.1 DataView ( buffer [ , byteOffset [ , byteLength ] ] ), https://tc39.es/ecma262/#sec-dataview-buffer-byteoffset-bytelength
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ThrowCompletionOr<Value> DataViewConstructor::call()
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{
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auto& vm = this->vm();
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return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.DataView);
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}
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// 25.3.2.1 DataView ( buffer [ , byteOffset [ , byteLength ] ] ), https://tc39.es/ecma262/#sec-dataview-buffer-byteoffset-bytelength
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ThrowCompletionOr<Object*> DataViewConstructor::construct(FunctionObject& new_target)
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{
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auto& vm = this->vm();
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auto& global_object = this->global_object();
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auto buffer = vm.argument(0);
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if (!buffer.is_object() || !is<ArrayBuffer>(buffer.as_object()))
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return vm.throw_completion<TypeError>(ErrorType::IsNotAn, buffer.to_string_without_side_effects(), vm.names.ArrayBuffer);
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auto& array_buffer = static_cast<ArrayBuffer&>(buffer.as_object());
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auto offset = TRY(vm.argument(1).to_index(global_object));
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if (array_buffer.is_detached())
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return vm.throw_completion<TypeError>(ErrorType::DetachedArrayBuffer);
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auto buffer_byte_length = array_buffer.byte_length();
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if (offset > buffer_byte_length)
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return vm.throw_completion<RangeError>(ErrorType::DataViewOutOfRangeByteOffset, offset, buffer_byte_length);
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size_t view_byte_length;
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if (vm.argument(2).is_undefined()) {
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view_byte_length = buffer_byte_length - offset;
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} else {
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view_byte_length = TRY(vm.argument(2).to_index(global_object));
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auto const checked_add = AK::make_checked(view_byte_length) + AK::make_checked(offset);
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if (checked_add.has_overflow() || checked_add.value() > buffer_byte_length)
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return vm.throw_completion<RangeError>(ErrorType::InvalidLength, vm.names.DataView);
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}
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auto* data_view = TRY(ordinary_create_from_constructor<DataView>(global_object, new_target, &GlobalObject::data_view_prototype, &array_buffer, view_byte_length, offset));
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if (array_buffer.is_detached())
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return vm.throw_completion<TypeError>(ErrorType::DetachedArrayBuffer);
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return data_view;
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}
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}
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