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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.
// @ts-check
/// <reference path="../../core/lib.deno_core.d.ts" />
/// <reference path="../../core/internal.d.ts" />
/// <reference path="../web/internal.d.ts" />
/// <reference path="../web/lib.deno_web.d.ts" />
const core = globalThis.Deno.core;
import DOMException from "internal:deno_web/01_dom_exception.js";
const primordials = globalThis.__bootstrap.primordials;
const {
ArrayBuffer,
ArrayBufferPrototype,
ArrayBufferPrototypeGetByteLength,
ArrayBufferPrototypeSlice,
ArrayBufferIsView,
DataView,
DataViewPrototypeGetBuffer,
DataViewPrototypeGetByteLength,
DataViewPrototypeGetByteOffset,
ObjectPrototypeIsPrototypeOf,
TypedArrayPrototypeGetBuffer,
TypedArrayPrototypeGetByteOffset,
TypedArrayPrototypeGetLength,
TypedArrayPrototypeGetSymbolToStringTag,
TypeErrorPrototype,
WeakMap,
WeakMapPrototypeSet,
Int8Array,
Int16Array,
Int32Array,
BigInt64Array,
Uint8Array,
Uint8ClampedArray,
Uint16Array,
Uint32Array,
BigUint64Array,
Float32Array,
Float64Array,
} = primordials;
const objectCloneMemo = new WeakMap();
function cloneArrayBuffer(
srcBuffer,
srcByteOffset,
srcLength,
_cloneConstructor,
) {
// this function fudges the return type but SharedArrayBuffer is disabled for a while anyway
return ArrayBufferPrototypeSlice(
srcBuffer,
srcByteOffset,
srcByteOffset + srcLength,
);
}
// TODO(petamoriken): Resizable ArrayBuffer support in the future
/** Clone a value in a similar way to structured cloning. It is similar to a
* StructureDeserialize(StructuredSerialize(...)). */
function structuredClone(value) {
// Performance optimization for buffers, otherwise
// `serialize/deserialize` will allocate new buffer.
if (ObjectPrototypeIsPrototypeOf(ArrayBufferPrototype, value)) {
const cloned = cloneArrayBuffer(
value,
0,
ArrayBufferPrototypeGetByteLength(value),
ArrayBuffer,
);
WeakMapPrototypeSet(objectCloneMemo, value, cloned);
return cloned;
}
if (ArrayBufferIsView(value)) {
const tag = TypedArrayPrototypeGetSymbolToStringTag(value);
// DataView
if (tag === undefined) {
return new DataView(
structuredClone(DataViewPrototypeGetBuffer(value)),
DataViewPrototypeGetByteOffset(value),
DataViewPrototypeGetByteLength(value),
);
}
// TypedArray
let Constructor;
switch (tag) {
case "Int8Array":
Constructor = Int8Array;
break;
case "Int16Array":
Constructor = Int16Array;
break;
case "Int32Array":
Constructor = Int32Array;
break;
case "BigInt64Array":
Constructor = BigInt64Array;
break;
case "Uint8Array":
Constructor = Uint8Array;
break;
case "Uint8ClampedArray":
Constructor = Uint8ClampedArray;
break;
case "Uint16Array":
Constructor = Uint16Array;
break;
case "Uint32Array":
Constructor = Uint32Array;
break;
case "BigUint64Array":
Constructor = BigUint64Array;
break;
case "Float32Array":
Constructor = Float32Array;
break;
case "Float64Array":
Constructor = Float64Array;
break;
}
return new Constructor(
structuredClone(TypedArrayPrototypeGetBuffer(value)),
TypedArrayPrototypeGetByteOffset(value),
TypedArrayPrototypeGetLength(value),
);
}
try {
return core.deserialize(core.serialize(value));
} catch (e) {
if (ObjectPrototypeIsPrototypeOf(TypeErrorPrototype, e)) {
throw new DOMException(e.message, "DataCloneError");
}
throw e;
}
}
export { structuredClone };
|
