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- {"ast":null,"code":"import { Subscriber } from '../Subscriber';\nimport { EmptyError } from '../util/EmptyError';\nexport function single(predicate) {\n return source => source.lift(new SingleOperator(predicate, source));\n}\nclass SingleOperator {\n constructor(predicate, source) {\n this.predicate = predicate;\n this.source = source;\n }\n call(subscriber, source) {\n return source.subscribe(new SingleSubscriber(subscriber, this.predicate, this.source));\n }\n}\nclass SingleSubscriber extends Subscriber {\n constructor(destination, predicate, source) {\n super(destination);\n this.predicate = predicate;\n this.source = source;\n this.seenValue = false;\n this.index = 0;\n }\n applySingleValue(value) {\n if (this.seenValue) {\n this.destination.error('Sequence contains more than one element');\n } else {\n this.seenValue = true;\n this.singleValue = value;\n }\n }\n _next(value) {\n const index = this.index++;\n if (this.predicate) {\n this.tryNext(value, index);\n } else {\n this.applySingleValue(value);\n }\n }\n tryNext(value, index) {\n try {\n if (this.predicate(value, index, this.source)) {\n this.applySingleValue(value);\n }\n } catch (err) {\n this.destination.error(err);\n }\n }\n _complete() {\n const destination = this.destination;\n if (this.index > 0) {\n destination.next(this.seenValue ? this.singleValue : undefined);\n destination.complete();\n } else {\n destination.error(new EmptyError());\n }\n }\n}\n//# sourceMappingURL=single.js.map","map":null,"metadata":{},"sourceType":"module","externalDependencies":[]}
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