| /** PURE_IMPORTS_START tslib,_Subscriber,_util_EmptyError PURE_IMPORTS_END */ |
| import * as tslib_1 from "tslib"; |
| import { Subscriber } from '../Subscriber'; |
| import { EmptyError } from '../util/EmptyError'; |
| export function single(predicate) { |
| return function (source) { return source.lift(new SingleOperator(predicate, source)); }; |
| } |
| var SingleOperator = /*@__PURE__*/ (function () { |
| function SingleOperator(predicate, source) { |
| this.predicate = predicate; |
| this.source = source; |
| } |
| SingleOperator.prototype.call = function (subscriber, source) { |
| return source.subscribe(new SingleSubscriber(subscriber, this.predicate, this.source)); |
| }; |
| return SingleOperator; |
| }()); |
| var SingleSubscriber = /*@__PURE__*/ (function (_super) { |
| tslib_1.__extends(SingleSubscriber, _super); |
| function SingleSubscriber(destination, predicate, source) { |
| var _this = _super.call(this, destination) || this; |
| _this.predicate = predicate; |
| _this.source = source; |
| _this.seenValue = false; |
| _this.index = 0; |
| return _this; |
| } |
| SingleSubscriber.prototype.applySingleValue = function (value) { |
| if (this.seenValue) { |
| this.destination.error('Sequence contains more than one element'); |
| } |
| else { |
| this.seenValue = true; |
| this.singleValue = value; |
| } |
| }; |
| SingleSubscriber.prototype._next = function (value) { |
| var index = this.index++; |
| if (this.predicate) { |
| this.tryNext(value, index); |
| } |
| else { |
| this.applySingleValue(value); |
| } |
| }; |
| SingleSubscriber.prototype.tryNext = function (value, index) { |
| try { |
| if (this.predicate(value, index, this.source)) { |
| this.applySingleValue(value); |
| } |
| } |
| catch (err) { |
| this.destination.error(err); |
| } |
| }; |
| SingleSubscriber.prototype._complete = function () { |
| var destination = this.destination; |
| if (this.index > 0) { |
| destination.next(this.seenValue ? this.singleValue : undefined); |
| destination.complete(); |
| } |
| else { |
| destination.error(new EmptyError); |
| } |
| }; |
| return SingleSubscriber; |
| }(Subscriber)); |
| //# sourceMappingURL=single.js.map |
