1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#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(GlobalObject& global_object)
: NativeFunction(vm().names.DataView.as_string(), *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_direct_property(vm.names.prototype, global_object.data_view_prototype(), 0);
define_direct_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
ThrowCompletionOr<Value> DataViewConstructor::call()
{
auto& vm = this->vm();
return vm.throw_completion<TypeError>(global_object(), 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>(global_object, 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(global_object));
if (array_buffer.is_detached())
return vm.throw_completion<TypeError>(global_object, ErrorType::DetachedArrayBuffer);
auto buffer_byte_length = array_buffer.byte_length();
if (offset > buffer_byte_length)
return vm.throw_completion<RangeError>(global_object, 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(global_object));
if (offset + view_byte_length > buffer_byte_length)
return vm.throw_completion<RangeError>(global_object, 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>(global_object, ErrorType::DetachedArrayBuffer);
return data_view;
}
}
|
