ix/asynciterable/generate.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.generate = void 0;
const tslib_1 = require("tslib");
const asynciterablex_js_1 = require("./asynciterablex.js");
const aborterror_js_1 = require("../aborterror.js");
class GenerateAsyncIterable extends asynciterablex_js_1.AsyncIterableX {
    constructor(initialState, condition, iterate, resultSelector) {
        super();
        this._initialState = initialState;
        this._condition = condition;
        this._iterate = iterate;
        this._resultSelector = resultSelector;
    }
    [Symbol.asyncIterator](signal) {
        return tslib_1.__asyncGenerator(this, arguments, function* _a() {
            (0, aborterror_js_1.throwIfAborted)(signal);
            for (let i = this._initialState; yield tslib_1.__await(this._condition(i, signal)); i = yield tslib_1.__await(this._iterate(i, signal))) {
                yield yield tslib_1.__await(yield tslib_1.__await(this._resultSelector(i, signal)));
            }
        });
    }
}
/**
 * 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.
 */
function generate(initialState, condition, iterate, resultSelector) {
    return new GenerateAsyncIterable(initialState, condition, iterate, resultSelector);
}
exports.generate = generate;

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