ix/asynciterable/operators/repeat.mjs

The Interactive Extensions for JavaScript

import { __asyncGenerator, __asyncValues, __await } from "tslib";
import { AsyncIterableX } from '../asynciterablex.mjs';
import { wrapWithAbort } from './withabort.mjs';
import { throwIfAborted } from '../../aborterror.mjs';
/** @ignore */
export class RepeatAsyncIterable extends AsyncIterableX {
    constructor(source, count) {
        super();
        this._source = source;
        this._count = count;
    }
    [Symbol.asyncIterator](signal) {
        return __asyncGenerator(this, arguments, function* _a() {
            var _b, e_1, _c, _d, _e, e_2, _f, _g;
            throwIfAborted(signal);
            if (this._count === -1) {
                while (1) {
                    try {
                        for (var _h = true, _j = (e_1 = void 0, __asyncValues(wrapWithAbort(this._source, signal))), _k; _k = yield __await(_j.next()), _b = _k.done, !_b; _h = true) {
                            _d = _k.value;
                            _h = false;
                            const item = _d;
                            yield yield __await(item);
                        }
                    }
                    catch (e_1_1) { e_1 = { error: e_1_1 }; }
                    finally {
                        try {
                            if (!_h && !_b && (_c = _j.return)) yield __await(_c.call(_j));
                        }
                        finally { if (e_1) throw e_1.error; }
                    }
                }
            }
            else {
                for (let i = 0; i < this._count; i++) {
                    try {
                        for (var _l = true, _m = (e_2 = void 0, __asyncValues(wrapWithAbort(this._source, signal))), _o; _o = yield __await(_m.next()), _e = _o.done, !_e; _l = true) {
                            _g = _o.value;
                            _l = false;
                            const item = _g;
                            yield yield __await(item);
                        }
                    }
                    catch (e_2_1) { e_2 = { error: e_2_1 }; }
                    finally {
                        try {
                            if (!_l && !_e && (_f = _m.return)) yield __await(_f.call(_m));
                        }
                        finally { if (e_2) throw e_2.error; }
                    }
                }
            }
        });
    }
}
/**
 * Repeats the async-enumerable sequence a specified number of times.
 *
 * @template TSource The type of the elements in the source sequence.
 * @param {number} [count=-1] Number of times to repeat the sequence. If not specified, the sequence repeats indefinitely.
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} The async-iterable sequence producing the elements of the given sequence repeatedly.
 */
export function repeat(count = -1) {
    return function repeatOperatorFunction(source) {
        return new RepeatAsyncIterable(source, count);
    };
}

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