@reactivex/ix-es2015-cjs/asynciterable/operators/expand.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.expand = exports.ExpandAsyncIterable = void 0;
const tslib_1 = require("tslib");
const asynciterablex_js_1 = require("../asynciterablex.js");
const withabort_js_1 = require("./withabort.js");
const aborterror_js_1 = require("../../aborterror.js");
/** @ignore */
class ExpandAsyncIterable extends asynciterablex_js_1.AsyncIterableX {
    constructor(source, selector) {
        super();
        this._source = source;
        this._selector = selector;
    }
    [Symbol.asyncIterator](signal) {
        return tslib_1.__asyncGenerator(this, arguments, function* _a() {
            var _b, e_1, _c, _d;
            (0, aborterror_js_1.throwIfAborted)(signal);
            const q = [this._source];
            while (q.length > 0) {
                const src = q.shift();
                try {
                    for (var _e = true, _f = (e_1 = void 0, tslib_1.__asyncValues((0, withabort_js_1.wrapWithAbort)(src, signal))), _g; _g = yield tslib_1.__await(_f.next()), _b = _g.done, !_b; _e = true) {
                        _d = _g.value;
                        _e = false;
                        const item = _d;
                        const items = yield tslib_1.__await(this._selector(item, signal));
                        q.push(items);
                        yield yield tslib_1.__await(item);
                    }
                }
                catch (e_1_1) { e_1 = { error: e_1_1 }; }
                finally {
                    try {
                        if (!_e && !_b && (_c = _f.return)) yield tslib_1.__await(_c.call(_f));
                    }
                    finally { if (e_1) throw e_1.error; }
                }
            }
        });
    }
}
exports.ExpandAsyncIterable = ExpandAsyncIterable;
/**
 * Expands (breadth first) the async-iterable sequence by recursively applying a selector function to generate more sequences at each recursion level.
 *
 * @template TSource Source sequence element type.
 * @param {((
 *     value: TSource,
 *     signal?: AbortSignal
 *   ) => AsyncIterable<TSource> | Promise<AsyncIterable<TSource>>)} selector Selector function to retrieve the next sequence to expand.
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} An operator which returns a sequence with results
 * from the recursive expansion of the source sequence.
 */
function expand(selector) {
    return function expandOperatorFunction(source) {
        return new ExpandAsyncIterable(source, selector);
    };
}
exports.expand = expand;

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