@reactivex/ix-es5-esm/asynciterable/generate.js

The Interactive Extensions for JavaScript

import { __asyncGenerator, __await, __extends, __generator } from "tslib";
import { AsyncIterableX } from './asynciterablex.js';
import { throwIfAborted } from '../aborterror.js';
var GenerateAsyncIterable = /** @class */ (function (_super) {
    __extends(GenerateAsyncIterable, _super);
    function GenerateAsyncIterable(initialState, condition, iterate, resultSelector) {
        var _this = _super.call(this) || this;
        _this._initialState = initialState;
        _this._condition = condition;
        _this._iterate = iterate;
        _this._resultSelector = resultSelector;
        return _this;
    }
    GenerateAsyncIterable.prototype[Symbol.asyncIterator] = function (signal) {
        return __asyncGenerator(this, arguments, function _a() {
            var i;
            return __generator(this, function (_b) {
                switch (_b.label) {
                    case 0:
                        throwIfAborted(signal);
                        i = this._initialState;
                        _b.label = 1;
                    case 1: return [4 /*yield*/, __await(this._condition(i, signal))];
                    case 2:
                        if (!_b.sent()) return [3 /*break*/, 8];
                        return [4 /*yield*/, __await(this._resultSelector(i, signal))];
                    case 3: return [4 /*yield*/, __await.apply(void 0, [_b.sent()])];
                    case 4: return [4 /*yield*/, _b.sent()];
                    case 5:
                        _b.sent();
                        _b.label = 6;
                    case 6: return [4 /*yield*/, __await(this._iterate(i, signal))];
                    case 7:
                        i = _b.sent();
                        return [3 /*break*/, 1];
                    case 8: return [2 /*return*/];
                }
            });
        });
    };
    return GenerateAsyncIterable;
}(AsyncIterableX));
/**
 * Generates an async-iterable sequence by running a state-driven loop producing the sequence's elements.
 *
 * @template TState The type of the state used in the generator loop.
 * @template TResult The type of the elements in the produced sequence.
 * @param {TState} initialState The initial state.
 * @param {((value: TState, signal?: AbortSignal) => boolean | Promise<boolean>)} condition Condition to terminate generation (upon returning false).
 * @param {((value: TState, signal?: AbortSignal) => TState | Promise<TState>)} iterate Iteration step function.
 * @param {((value: TState, signal?: AbortSignal) => TResult | Promise<TResult>)} resultSelector Selector function for results produced in
 * the sequence.
 * @returns {AsyncIterableX<TResult>} The generated async-iterable sequence.
 */
export function generate(initialState, condition, iterate, resultSelector) {
    return new GenerateAsyncIterable(initialState, condition, iterate, resultSelector);
}

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