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{ isFunction } from './util/isFunction';\nimport { Observer, PartialObserver } from './Observer';\nimport { Subscription } from './Subscription';\nimport { empty as emptyObserver } from './Observer';\nimport { rxSubscriber as rxSubscriberSymbol } from './symbol/rxSubscriber';\n\n/**\n * Implements the {@link Observer} interface and extends the\n * {@link Subscription} class. While the {@link Observer} is the public API for\n * consuming the values of an {@link Observable}, all Observers get converted to\n * a Subscriber, in order to provide Subscription-like capabilities such as\n * `unsubscribe`. Subscriber is a common type in RxJS, and crucial for\n * implementing operators, but it is rarely used as a public API.\n *\n * @class Subscriber<T>\n */\nexport class Subscriber<T> extends Subscription implements Observer<T> {\n\n [rxSubscriberSymbol]() { return this; }\n\n /**\n * A static factory for a Subscriber, given a (potentially partial) definition\n * of an Observer.\n * @param {function(x: ?T): void} [next] The `next` callback of an Observer.\n * @param {function(e: ?any): void} [error] The `error` callback of an\n * Observer.\n * @param {function(): void} [complete] The `complete` callback of an\n * Observer.\n * @return {Subscriber<T>} A Subscriber wrapping the (partially defined)\n * Observer represented by the given arguments.\n */\n static create<T>(next?: (x?: T) => void,\n error?: (e?: any) => void,\n complete?: () => void): Subscriber<T> {\n const subscriber = new Subscriber(next, error, complete);\n subscriber.syncErrorThrowable = false;\n return subscriber;\n }\n\n public syncErrorValue: any = null;\n public syncErrorThrown: boolean = false;\n public syncErrorThrowable: boolean = false;\n\n protected isStopped: boolean = false;\n protected destination: PartialObserver<any>; // this `any` is the escape hatch to erase extra type param (e.g. R)\n\n /**\n * @param {Observer|function(value: T): void} [destinationOrNext] A partially\n * defined Observer or a `next` callback function.\n * @param {function(e: ?any): void} [error] The `error` callback of an\n * Observer.\n * @param {function(): void} [complete] The `complete` callback of an\n * Observer.\n */\n constructor(destinationOrNext?: PartialObserver<any> | ((value: T) => void),\n error?: (e?: any) => void,\n complete?: () => void) {\n super();\n\n switch (arguments.length) {\n case 0:\n this.destination = emptyObserver;\n break;\n case 1:\n if (!destinationOrNext) {\n this.destination = emptyObserver;\n break;\n }\n if (typeof destinationOrNext === 'object') {\n // HACK(benlesh): To resolve an issue where Node users may have multiple\n // copies of rxjs in their node_modules directory.\n if (isTrustedSubscriber(destinationOrNext)) {\n const trustedSubscriber = destinationOrNext[rxSubscriberSymbol]() as Subscriber<any>;\n this.syncErrorThrowable = trustedSubscriber.syncErrorThrowable;\n this.destination = trustedSubscriber;\n trustedSubscriber.add(this);\n } else {\n this.syncErrorThrowable = true;\n this.destination = new SafeSubscriber<T>(this, <PartialObserver<any>> destinationOrNext);\n }\n break;\n }\n default:\n this.syncErrorThrowable = true;\n this.destination = new SafeSubscriber<T>(this, <((value: T) => void)> destinationOrNext, error, complete);\n break;\n }\n }\n\n /**\n * The {@link Observer} callback to receive notifications of type `next` from\n * the Observable, with a value. The Observable may call this method 0 or more\n * times.\n * @param {T} [value] The `next` value.\n * @return {void}\n */\n next(value?: T): void {\n if (!this.isStopped) {\n this._next(value);\n }\n }\n\n /**\n * The {@link Observer} callback to receive notifications of type `error` from\n * the Observable, with an attached {@link Error}. Notifies the Observer that\n * the Observable has experienced an error condition.\n * @param {any} [err] The `error` exception.\n * @return {void}\n */\n error(err?: any): void {\n if (!this.isStopped) {\n this.isStopped = true;\n this._error(err);\n }\n }\n\n /**\n * The {@link Observer} callback to receive a valueless notification of type\n * `complete` from the Observable. Notifies the Observer that the Observable\n * has finished sending push-based notifications.\n * @return {void}\n */\n complete(): void {\n if (!this.isStopped) {\n this.isStopped = true;\n this._complete();\n }\n }\n\n unsubscribe(): void {\n if (this.closed) {\n return;\n }\n this.isStopped = true;\n super.unsubscribe();\n }\n\n protected _next(value: T): void {\n this.destination.next(value);\n }\n\n protected _error(err: any): void {\n this.destination.error(err);\n this.unsubscribe();\n }\n\n protected _complete(): void {\n this.destination.complete();\n this.unsubscribe();\n }\n\n /** @deprecated internal use only */ _unsubscribeAndRecycle(): Subscriber<T> {\n const { _parent, _parents } = this;\n this._parent = null;\n this._parents = null;\n this.unsubscribe();\n this.closed = false;\n this.isStopped = false;\n this._parent = _parent;\n this._parents = _parents;\n return this;\n }\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass SafeSubscriber<T> extends Subscriber<T> {\n\n private _context: any;\n\n constructor(private _parentSubscriber: Subscriber<T>,\n observerOrNext?: PartialObserver<T> | ((value: T) => void),\n error?: (e?: any) => void,\n complete?: () => void) {\n super();\n\n let next: ((value: T) => void);\n let context: any = this;\n\n if (isFunction(observerOrNext)) {\n next = (<((value: T) => void)> observerOrNext);\n } else if (observerOrNext) {\n next = (<PartialObserver<T>> observerOrNext).next;\n error = (<PartialObserver<T>> observerOrNext).error;\n complete = (<PartialObserver<T>> observerOrNext).complete;\n if (observerOrNext !== emptyObserver) {\n context = Object.create(observerOrNext);\n if (isFunction(context.unsubscribe)) {\n this.add(<() => void> context.unsubscribe.bind(context));\n }\n context.unsubscribe = this.unsubscribe.bind(this);\n }\n }\n\n this._context = context;\n this._next = next;\n this._error = error;\n this._complete = complete;\n }\n\n next(value?: T): void {\n if (!this.isStopped && this._next) {\n const { _parentSubscriber } = this;\n if (!_parentSubscriber.syncErrorThrowable) {\n this.__tryOrUnsub(this._next, value);\n } else if (this.__tryOrSetError(_parentSubscriber, this._next, value)) {\n this.unsubscribe();\n }\n }\n }\n\n error(err?: any): void {\n if (!this.isStopped) {\n const { _parentSubscriber } = this;\n if (this._error) {\n if (!_parentSubscriber.syncErrorThrowable) {\n this.__tryOrUnsub(this._error, err);\n this.unsubscribe();\n } else {\n this.__tryOrSetError(_parentSubscriber, this._error, err);\n this.unsubscribe();\n }\n } else if (!_parentSubscriber.syncErrorThrowable) {\n this.unsubscribe();\n throw err;\n } else {\n _parentSubscriber.syncErrorValue = err;\n _parentSubscriber.syncErrorThrown = true;\n this.unsubscribe();\n }\n }\n }\n\n complete(): void {\n if (!this.isStopped) {\n const { _parentSubscriber } = this;\n if (this._complete) {\n const wrappedComplete = () => this._complete.call(this._context);\n\n if (!_parentSubscriber.syncErrorThrowable) {\n this.__tryOrUnsub(wrappedComplete);\n this.unsubscribe();\n } else {\n this.__tryOrSetError(_parentSubscriber, wrappedComplete);\n this.unsubscribe();\n }\n } else {\n this.unsubscribe();\n }\n }\n }\n\n private __tryOrUnsub(fn: Function, value?: any): void {\n try {\n fn.call(this._context, value);\n } catch (err) {\n this.unsubscribe();\n throw err;\n }\n }\n\n private __tryOrSetError(parent: Subscriber<T>, fn: Function, value?: any): boolean {\n try {\n fn.call(this._context, value);\n } catch (err) {\n parent.syncErrorValue = err;\n parent.syncErrorThrown = true;\n return true;\n }\n return false;\n }\n\n /** @deprecated internal use only */ _unsubscribe(): void {\n const { _parentSubscriber } = this;\n this._context = null;\n this._parentSubscriber = null;\n _parentSubscriber.unsubscribe();\n }\n}\n\nfunction isTrustedSubscriber(obj: any) {\n return obj instanceof Subscriber || ('syncErrorThrowable' in obj && obj[rxSubscriberSymbol]);\n}\n"]}
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