ix/asynciterable/operators/takeuntil.js

The Interactive Extensions for JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.takeUntil = exports.TakeUntilAsyncIterable = 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");
const safeRace_js_1 = require("../../util/safeRace.js");
const DONE_PROMISE_VALUE = undefined;
/** @ignore */
class TakeUntilAsyncIterable extends asynciterablex_js_1.AsyncIterableX {
    constructor(source, other) {
        super();
        this._source = source;
        this._other = other;
    }
    [Symbol.asyncIterator](signal) {
        return tslib_1.__asyncGenerator(this, arguments, function* _a() {
            (0, aborterror_js_1.throwIfAborted)(signal);
            const donePromise = this._other(signal).then(() => DONE_PROMISE_VALUE);
            const itemsAsyncIterator = (0, withabort_js_1.wrapWithAbort)(this._source, signal)[Symbol.asyncIterator]();
            for (;;) {
                const itemPromise = itemsAsyncIterator.next();
                const result = yield tslib_1.__await((0, safeRace_js_1.safeRace)([donePromise, itemPromise]));
                if (result === DONE_PROMISE_VALUE || result.done) {
                    break;
                }
                yield yield tslib_1.__await(result.value);
            }
        });
    }
}
exports.TakeUntilAsyncIterable = TakeUntilAsyncIterable;
/**
 * Returns the elements from the source async-iterable sequence until the other function
 * that returns a promise produces an element.
 *
 * @template TSource The type of the elements in the source sequence.
 * @param {(signal?: AbortSignal) => Promise<any>} other A function that terminates the propagation of
 * elements in the source sequence.
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} An async-iterable sequence containing the elements of the
 * source sequence up to the point the other function which returns a promise interrupted further propagation.
 */
function takeUntil(other) {
    return function takeUntilOperatorFunction(source) {
        return new TakeUntilAsyncIterable(source, other);
    };
}
exports.takeUntil = takeUntil;

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