| 1 | /** PURE_IMPORTS_START tslib,_Subscriber,_util_EmptyError PURE_IMPORTS_END */
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| 2 | import * as tslib_1 from "tslib";
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| 3 | import { Subscriber } from '../Subscriber';
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| 4 | import { EmptyError } from '../util/EmptyError';
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| 5 | export function single(predicate) {
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| 6 | return function (source) { return source.lift(new SingleOperator(predicate, source)); };
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| 7 | }
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| 8 | var SingleOperator = /*@__PURE__*/ (function () {
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| 9 | function SingleOperator(predicate, source) {
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| 10 | this.predicate = predicate;
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| 11 | this.source = source;
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| 12 | }
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| 13 | SingleOperator.prototype.call = function (subscriber, source) {
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| 14 | return source.subscribe(new SingleSubscriber(subscriber, this.predicate, this.source));
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| 15 | };
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| 16 | return SingleOperator;
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| 17 | }());
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| 18 | var SingleSubscriber = /*@__PURE__*/ (function (_super) {
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| 19 | tslib_1.__extends(SingleSubscriber, _super);
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| 20 | function SingleSubscriber(destination, predicate, source) {
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| 21 | var _this = _super.call(this, destination) || this;
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| 22 | _this.predicate = predicate;
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| 23 | _this.source = source;
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| 24 | _this.seenValue = false;
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| 25 | _this.index = 0;
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| 26 | return _this;
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| 27 | }
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| 28 | SingleSubscriber.prototype.applySingleValue = function (value) {
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| 29 | if (this.seenValue) {
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| 30 | this.destination.error('Sequence contains more than one element');
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| 31 | }
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| 32 | else {
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| 33 | this.seenValue = true;
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| 34 | this.singleValue = value;
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| 35 | }
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| 36 | };
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| 37 | SingleSubscriber.prototype._next = function (value) {
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| 38 | var index = this.index++;
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| 39 | if (this.predicate) {
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| 40 | this.tryNext(value, index);
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| 41 | }
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| 42 | else {
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| 43 | this.applySingleValue(value);
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| 44 | }
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| 45 | };
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| 46 | SingleSubscriber.prototype.tryNext = function (value, index) {
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| 47 | try {
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| 48 | if (this.predicate(value, index, this.source)) {
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| 49 | this.applySingleValue(value);
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| 50 | }
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| 51 | }
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| 52 | catch (err) {
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| 53 | this.destination.error(err);
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| 54 | }
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| 55 | };
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| 56 | SingleSubscriber.prototype._complete = function () {
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| 57 | var destination = this.destination;
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| 58 | if (this.index > 0) {
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| 59 | destination.next(this.seenValue ? this.singleValue : undefined);
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| 60 | destination.complete();
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| 61 | }
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| 62 | else {
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| 63 | destination.error(new EmptyError);
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| 64 | }
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| 65 | };
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| 66 | return SingleSubscriber;
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| 67 | }(Subscriber));
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| 68 | //# sourceMappingURL=single.js.map
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