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82 lines
2.8 KiB
82 lines
2.8 KiB
4 years ago
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"use strict";
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var __extends = (this && this.__extends) || (function () {
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var extendStatics = function (d, b) {
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extendStatics = Object.setPrototypeOf ||
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({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
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function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; };
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return extendStatics(d, b);
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}
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return function (d, b) {
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extendStatics(d, b);
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function __() { this.constructor = d; }
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d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
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};
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})();
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Object.defineProperty(exports, "__esModule", { value: true });
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var Subscriber_1 = require("../Subscriber");
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var EmptyError_1 = require("../util/EmptyError");
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function single(predicate) {
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return function (source) { return source.lift(new SingleOperator(predicate, source)); };
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}
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exports.single = single;
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var SingleOperator = (function () {
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function SingleOperator(predicate, source) {
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this.predicate = predicate;
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this.source = source;
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}
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SingleOperator.prototype.call = function (subscriber, source) {
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return source.subscribe(new SingleSubscriber(subscriber, this.predicate, this.source));
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};
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return SingleOperator;
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}());
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var SingleSubscriber = (function (_super) {
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__extends(SingleSubscriber, _super);
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function SingleSubscriber(destination, predicate, source) {
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var _this = _super.call(this, destination) || this;
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_this.predicate = predicate;
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_this.source = source;
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_this.seenValue = false;
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_this.index = 0;
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return _this;
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}
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SingleSubscriber.prototype.applySingleValue = function (value) {
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if (this.seenValue) {
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this.destination.error('Sequence contains more than one element');
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}
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else {
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this.seenValue = true;
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this.singleValue = value;
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}
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};
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SingleSubscriber.prototype._next = function (value) {
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var index = this.index++;
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if (this.predicate) {
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this.tryNext(value, index);
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}
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else {
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this.applySingleValue(value);
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}
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};
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SingleSubscriber.prototype.tryNext = function (value, index) {
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try {
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if (this.predicate(value, index, this.source)) {
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this.applySingleValue(value);
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}
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}
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catch (err) {
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this.destination.error(err);
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}
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};
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SingleSubscriber.prototype._complete = function () {
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var destination = this.destination;
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if (this.index > 0) {
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destination.next(this.seenValue ? this.singleValue : undefined);
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destination.complete();
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}
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else {
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destination.error(new EmptyError_1.EmptyError);
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}
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};
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return SingleSubscriber;
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}(Subscriber_1.Subscriber));
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//# sourceMappingURL=single.js.map
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