ix/asynciterable/concat.mjs

The Interactive Extensions for JavaScript

import { __asyncGenerator, __asyncValues, __await } from "tslib";
import { AsyncIterableX } from './asynciterablex.mjs';
import { wrapWithAbort } from './operators/withabort.mjs';
import { throwIfAborted } from '../aborterror.mjs';
/** @ignore */
export class ConcatAsyncIterable extends AsyncIterableX {
    constructor(source) {
        super();
        this._source = source;
    }
    [Symbol.asyncIterator](signal) {
        return __asyncGenerator(this, arguments, function* _a() {
            var _b, e_1, _c, _d;
            throwIfAborted(signal);
            for (const outer of this._source) {
                try {
                    for (var _e = true, _f = (e_1 = void 0, __asyncValues(wrapWithAbort(outer, signal))), _g; _g = yield __await(_f.next()), _b = _g.done, !_b; _e = true) {
                        _d = _g.value;
                        _e = false;
                        const item = _d;
                        yield yield __await(item);
                    }
                }
                catch (e_1_1) { e_1 = { error: e_1_1 }; }
                finally {
                    try {
                        if (!_e && !_b && (_c = _f.return)) yield __await(_c.call(_f));
                    }
                    finally { if (e_1) throw e_1.error; }
                }
            }
        });
    }
}
export function _concatAll(source) {
    return new ConcatAsyncIterable(source);
}
/**
 * Concatenates all async-iterable sequences in the given sequences, as long as the previous async-iterable
 * sequence terminated successfully.
 *
 * @template T The type of the elements in the sequences.
 * @param {...AsyncIterable<T>[]} args The async-iterable sources.
 * @returns {AsyncIterableX<T>} An async-iterable sequence that contains the elements of each given sequence, in sequential order.
 */
export function concat(...args) {
    return new ConcatAsyncIterable(args);
}

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