| 1 | import { AsyncIterableX } from './asynciterablex';
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| 2 | export class ExpandAsyncIterable extends AsyncIterableX {
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| 3 | constructor(source, selector) {
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| 4 | super();
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| 5 | this._source = source;
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| 6 | this._selector = selector;
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| 7 | }
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| 8 | async *[Symbol.asyncIterator]() {
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| 9 | let q = [this._source];
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| 10 | while (q.length > 0) {
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| 11 | let src = q.shift();
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| 12 | for await (let item of src) {
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| 13 | let items = await this._selector(item);
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| 14 | q.push(items);
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| 15 | yield item;
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| 16 | }
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| 17 | }
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| 18 | }
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| 19 | }
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| 20 | export function expand(source, selector) {
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| 21 | return new ExpandAsyncIterable(source, selector);
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| 22 | }
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| 23 |
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| 24 |
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