@reactivex/ix-es5-esm
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The Interactive Extensions for JavaScript
94 lines (92 loc) • 4.08 kB
JavaScript
import { __asyncGenerator, __asyncValues, __await, __extends, __generator } from "tslib";
import { AsyncIterableX } from '../asynciterablex.js';
import { wrapWithAbort } from './withabort.js';
import { throwIfAborted } from '../../aborterror.js';
/** @ignore */
var ExpandAsyncIterable = /** @class */ (function (_super) {
__extends(ExpandAsyncIterable, _super);
function ExpandAsyncIterable(source, selector) {
var _this = _super.call(this) || this;
_this._source = source;
_this._selector = selector;
return _this;
}
ExpandAsyncIterable.prototype[Symbol.asyncIterator] = function (signal) {
return __asyncGenerator(this, arguments, function _a() {
var q, src, _b, _c, _d, item, items, e_1_1;
var _e, e_1, _f, _g;
return __generator(this, function (_h) {
switch (_h.label) {
case 0:
throwIfAborted(signal);
q = [this._source];
_h.label = 1;
case 1:
if (!(q.length > 0)) return [3 /*break*/, 17];
src = q.shift();
_h.label = 2;
case 2:
_h.trys.push([2, 10, 11, 16]);
_b = true, _c = (e_1 = void 0, __asyncValues(wrapWithAbort(src, signal)));
_h.label = 3;
case 3: return [4 /*yield*/, __await(_c.next())];
case 4:
if (!(_d = _h.sent(), _e = _d.done, !_e)) return [3 /*break*/, 9];
_g = _d.value;
_b = false;
item = _g;
return [4 /*yield*/, __await(this._selector(item, signal))];
case 5:
items = _h.sent();
q.push(items);
return [4 /*yield*/, __await(item)];
case 6: return [4 /*yield*/, _h.sent()];
case 7:
_h.sent();
_h.label = 8;
case 8:
_b = true;
return [3 /*break*/, 3];
case 9: return [3 /*break*/, 16];
case 10:
e_1_1 = _h.sent();
e_1 = { error: e_1_1 };
return [3 /*break*/, 16];
case 11:
_h.trys.push([11, , 14, 15]);
if (!(!_b && !_e && (_f = _c.return))) return [3 /*break*/, 13];
return [4 /*yield*/, __await(_f.call(_c))];
case 12:
_h.sent();
_h.label = 13;
case 13: return [3 /*break*/, 15];
case 14:
if (e_1) throw e_1.error;
return [7 /*endfinally*/];
case 15: return [7 /*endfinally*/];
case 16: return [3 /*break*/, 1];
case 17: return [2 /*return*/];
}
});
});
};
return ExpandAsyncIterable;
}(AsyncIterableX));
export { 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.
*/
export function expand(selector) {
return function expandOperatorFunction(source) {
return new ExpandAsyncIterable(source, selector);
};
}
//# sourceMappingURL=expand.js.map