1 |
|
2 | import { asyncIterToStream } from 'whatwg-stream-to-async-iter';
|
3 | export const isIterable = (x) => x != null && typeof x === 'object' && Symbol.iterator in x;
|
4 | export const isAsyncIterable = (x) => x != null && typeof x === 'object' && Symbol.asyncIterator in x;
|
5 | const isPromiseLike = (x) => x != null && typeof x === 'object' && 'then' in x && typeof x.then === 'function';
|
6 | const isToJSON = (x) => x != null && typeof x === 'object' && 'toJSON' in x;
|
7 | const safeAdd = (seen, value) => {
|
8 | if (seen.has(value))
|
9 | throw TypeError('Converting circular structure to JSON');
|
10 | seen.add(value);
|
11 | };
|
12 | const check = (v) => {
|
13 | if (v === undefined)
|
14 | return false;
|
15 | const type = typeof v;
|
16 | return type !== 'function' && type !== 'symbol';
|
17 | };
|
18 |
|
19 |
|
20 |
|
21 |
|
22 |
|
23 |
|
24 | export async function* jsonStringifyGenerator(value, seen = new WeakSet()) {
|
25 | if (isAsyncIterable(value)) {
|
26 | yield '[';
|
27 | safeAdd(seen, value);
|
28 | let first = true;
|
29 | for await (const v of value) {
|
30 | if (!first)
|
31 | yield ',';
|
32 | else
|
33 | first = false;
|
34 | yield* jsonStringifyGenerator(v, seen);
|
35 | }
|
36 | seen.delete(value);
|
37 | yield ']';
|
38 | }
|
39 | else if (isPromiseLike(value)) {
|
40 | const v = await value;
|
41 | if (check(v)) {
|
42 | safeAdd(seen, value);
|
43 | yield* jsonStringifyGenerator(v, seen);
|
44 | seen.delete(value);
|
45 | }
|
46 | }
|
47 | else if (isToJSON(value)) {
|
48 | const v = JSON.stringify(value);
|
49 | if (check(v))
|
50 | yield v;
|
51 | }
|
52 | else if (Array.isArray(value)) {
|
53 | yield '[';
|
54 | safeAdd(seen, value);
|
55 | let first = true;
|
56 | for (const v of value) {
|
57 | if (!first)
|
58 | yield ',';
|
59 | else
|
60 | first = false;
|
61 | yield* jsonStringifyGenerator(v, seen);
|
62 | }
|
63 | seen.delete(value);
|
64 | yield ']';
|
65 | }
|
66 | else if (value != null && typeof value === 'object') {
|
67 | yield '{';
|
68 | safeAdd(seen, value);
|
69 | let first = true;
|
70 | for (const [k, v] of Object.entries(value)) {
|
71 | if (check(v)) {
|
72 | const generator = jsonStringifyGenerator(v, seen);
|
73 | const peek = await generator.next();
|
74 | if (check(peek.value)) {
|
75 | if (!first)
|
76 | yield ',';
|
77 | else
|
78 | first = false;
|
79 | yield `${JSON.stringify(k)}:`;
|
80 | yield peek.value;
|
81 | yield* generator;
|
82 | }
|
83 | }
|
84 | }
|
85 | seen.delete(value);
|
86 | yield '}';
|
87 | }
|
88 | else {
|
89 | yield check(value) ? JSON.stringify(value) : 'null';
|
90 | }
|
91 | }
|
92 |
|
93 |
|
94 |
|
95 | export function jsonStringifyStream(value) {
|
96 | return asyncIterToStream(jsonStringifyGenerator(value));
|
97 | }
|
98 | export class JSONStringifyReadable extends ReadableStream {
|
99 | constructor(value) {
|
100 | let iterator;
|
101 | super({
|
102 | start() {
|
103 | iterator = jsonStringifyGenerator(value)[Symbol.asyncIterator]();
|
104 | },
|
105 | async pull(controller) {
|
106 |
|
107 | const { value, done } = await iterator.next();
|
108 | if (!done)
|
109 | controller.enqueue(value);
|
110 | else
|
111 | controller.close();
|
112 | },
|
113 | async cancel(reason) {
|
114 | var _a;
|
115 | try {
|
116 | await ((_a = iterator.throw) === null || _a === void 0 ? void 0 : _a.call(iterator, reason));
|
117 | }
|
118 | catch { }
|
119 | },
|
120 | });
|
121 | }
|
122 | }
|
123 |
|
\ | No newline at end of file |