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69 lines
2.3 KiB
JavaScript
69 lines
2.3 KiB
JavaScript
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/** PURE_IMPORTS_START tslib,_Subscriber,_util_EmptyError PURE_IMPORTS_END */
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import * as tslib_1 from "tslib";
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import { Subscriber } from '../Subscriber';
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import { EmptyError } from '../util/EmptyError';
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export 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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var SingleOperator = /*@__PURE__*/ (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 = /*@__PURE__*/ (function (_super) {
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tslib_1.__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);
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}
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};
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return SingleSubscriber;
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}(Subscriber));
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//# sourceMappingURL=single.js.map
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