Opal-Estate-Pro/node_modules/rxjs/operators/bufferToggle.js.map
2019-09-13 11:27:52 +07:00

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Starts\n * collecting only when `opening` emits, and calls the `closingSelector`\n * function to get an Observable that tells when to close the buffer.</span>\n *\n * <img src=\"./img/bufferToggle.png\" width=\"100%\">\n *\n * Buffers values from the source by opening the buffer via signals from an\n * Observable provided to `openings`, and closing and sending the buffers when\n * a Subscribable or Promise returned by the `closingSelector` function emits.\n *\n * @example <caption>Every other second, emit the click events from the next 500ms</caption>\n * var clicks = Rx.Observable.fromEvent(document, 'click');\n * var openings = Rx.Observable.interval(1000);\n * var buffered = clicks.bufferToggle(openings, i =>\n * i % 2 ? Rx.Observable.interval(500) : Rx.Observable.empty()\n * );\n * buffered.subscribe(x => console.log(x));\n *\n * @see {@link buffer}\n * @see {@link bufferCount}\n * @see {@link bufferTime}\n * @see {@link bufferWhen}\n * @see {@link windowToggle}\n *\n * @param {SubscribableOrPromise<O>} openings A Subscribable or Promise of notifications to start new\n * buffers.\n * @param {function(value: O): SubscribableOrPromise} closingSelector A function that takes\n * the value emitted by the `openings` observable and returns a Subscribable or Promise,\n * which, when it emits, signals that the associated buffer should be emitted\n * and cleared.\n * @return {Observable<T[]>} An observable of arrays of buffered values.\n * @method bufferToggle\n * @owner Observable\n */\nexport function bufferToggle<T, O>(\n openings: SubscribableOrPromise<O>,\n closingSelector: (value: O) => SubscribableOrPromise<any>\n): OperatorFunction<T, T[]> {\n return function bufferToggleOperatorFunction(source: Observable<T>) {\n return source.lift(new BufferToggleOperator<T, O>(openings, closingSelector));\n };\n}\n\nclass BufferToggleOperator<T, O> implements Operator<T, T[]> {\n\n constructor(private openings: SubscribableOrPromise<O>,\n private closingSelector: (value: O) => SubscribableOrPromise<any>) {\n }\n\n call(subscriber: Subscriber<T[]>, source: any): any {\n return source.subscribe(new BufferToggleSubscriber(subscriber, this.openings, this.closingSelector));\n }\n}\n\ninterface BufferContext<T> {\n buffer: T[];\n subscription: Subscription;\n}\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @ignore\n * @extends {Ignored}\n */\nclass BufferToggleSubscriber<T, O> extends OuterSubscriber<T, O> {\n private contexts: Array<BufferContext<T>> = [];\n\n constructor(destination: Subscriber<T[]>,\n private openings: SubscribableOrPromise<O>,\n private closingSelector: (value: O) => SubscribableOrPromise<any> | void) {\n super(destination);\n this.add(subscribeToResult(this, openings));\n }\n\n protected _next(value: T): void {\n const contexts = this.contexts;\n const len = contexts.length;\n for (let i = 0; i < len; i++) {\n contexts[i].buffer.push(value);\n }\n }\n\n protected _error(err: any): void {\n const contexts = this.contexts;\n while (contexts.length > 0) {\n const context = contexts.shift();\n context.subscription.unsubscribe();\n context.buffer = null;\n context.subscription = null;\n }\n this.contexts = null;\n super._error(err);\n }\n\n protected _complete(): void {\n const contexts = this.contexts;\n while (contexts.length > 0) {\n const context = contexts.shift();\n this.destination.next(context.buffer);\n context.subscription.unsubscribe();\n context.buffer = null;\n context.subscription = null;\n }\n this.contexts = null;\n super._complete();\n }\n\n notifyNext(outerValue: any, innerValue: O,\n outerIndex: number, innerIndex: number,\n innerSub: InnerSubscriber<T, O>): void {\n outerValue ? this.closeBuffer(outerValue) : this.openBuffer(innerValue);\n }\n\n notifyComplete(innerSub: InnerSubscriber<T, O>): void {\n this.closeBuffer((<any> innerSub).context);\n }\n\n private openBuffer(value: O): void {\n try {\n const closingSelector = this.closingSelector;\n const closingNotifier = closingSelector.call(this, value);\n if (closingNotifier) {\n this.trySubscribe(closingNotifier);\n }\n } catch (err) {\n this._error(err);\n }\n }\n\n private closeBuffer(context: BufferContext<T>): void {\n const contexts = this.contexts;\n\n if (contexts && context) {\n const { buffer, subscription } = context;\n this.destination.next(buffer);\n contexts.splice(contexts.indexOf(context), 1);\n this.remove(subscription);\n subscription.unsubscribe();\n }\n }\n\n private trySubscribe(closingNotifier: any): void {\n const contexts = this.contexts;\n\n const buffer: Array<T> = [];\n const subscription = new Subscription();\n const context = { buffer, subscription };\n contexts.push(context);\n\n const innerSubscription = subscribeToResult(this, closingNotifier, <any>context);\n\n if (!innerSubscription || innerSubscription.closed) {\n this.closeBuffer(context);\n } else {\n (<any> innerSubscription).context = context;\n\n this.add(innerSubscription);\n subscription.add(innerSubscription);\n }\n }\n}\n"]}