@reactivex/ix-es5-esm/asynciterable/operators/slice.js

The Interactive Extensions for JavaScript

import { __asyncGenerator, __await, __extends, __generator } from "tslib";
import { AsyncIterableX } from '../asynciterablex.js';
import { wrapWithAbort } from './withabort.js';
import { throwIfAborted } from '../../aborterror.js';
/** @ignore */
var SliceAsyncIterable = /** @class */ (function (_super) {
    __extends(SliceAsyncIterable, _super);
    function SliceAsyncIterable(source, begin, end) {
        var _this = _super.call(this) || this;
        _this._source = source;
        _this._begin = begin;
        _this._end = end;
        return _this;
    }
    SliceAsyncIterable.prototype[Symbol.asyncIterator] = function (signal) {
        return __asyncGenerator(this, arguments, function _a() {
            var source, it, begin, next, _b, end;
            return __generator(this, function (_c) {
                switch (_c.label) {
                    case 0:
                        throwIfAborted(signal);
                        source = wrapWithAbort(this._source, signal);
                        it = source[Symbol.asyncIterator]();
                        begin = this._begin;
                        _c.label = 1;
                    case 1:
                        _b = begin > 0;
                        if (!_b) return [3 /*break*/, 3];
                        return [4 /*yield*/, __await(it.next())];
                    case 2:
                        _b = !(next = _c.sent()).done;
                        _c.label = 3;
                    case 3:
                        if (!_b) return [3 /*break*/, 4];
                        begin--;
                        return [3 /*break*/, 1];
                    case 4:
                        end = this._end;
                        if (!(end > 0)) return [3 /*break*/, 9];
                        _c.label = 5;
                    case 5: return [4 /*yield*/, __await(it.next())];
                    case 6:
                        if (!!(next = _c.sent()).done) return [3 /*break*/, 9];
                        return [4 /*yield*/, __await(next.value)];
                    case 7: return [4 /*yield*/, _c.sent()];
                    case 8:
                        _c.sent();
                        if (--end === 0) {
                            return [3 /*break*/, 9];
                        }
                        return [3 /*break*/, 5];
                    case 9: return [2 /*return*/];
                }
            });
        });
    };
    return SliceAsyncIterable;
}(AsyncIterableX));
export { SliceAsyncIterable };
/**
 * Returns the elements from the source async-iterable sequence only after the function that returns a promise produces an element.
 *
 * @template TSource The type of elements in the source sequence.
 * @param {number} begin Zero-based index at which to begin extraction.
 * @param {number} [end=Infinity] Zero-based index before which to end extraction.
 * @returns {MonoTypeOperatorAsyncFunction<TSource>} An async-iterable containing the extracted elements.
 */
export function slice(begin, end) {
    if (end === void 0) { end = Infinity; }
    return function sliceOperatorFunction(source) {
        return new SliceAsyncIterable(source, begin, end);
    };
}

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