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{ Observable } from '../Observable';\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nimport { IScheduler } from '../Scheduler';\nimport { Action } from '../scheduler/Action';\nimport { tryCatch } from '../util/tryCatch';\nimport { errorObject } from '../util/errorObject';\nimport { AsyncSubject } from '../AsyncSubject';\n\n/**\n * We need this JSDoc comment for affecting ESDoc.\n * @extends {Ignored}\n * @hide true\n */\nexport class BoundNodeCallbackObservable<T> extends Observable<T> {\n subject: AsyncSubject<T>;\n\n /* tslint:disable:max-line-length */\n static create<R>(callbackFunc: (callback: (err: any, result: R) => any) => any, selector?: void, scheduler?: IScheduler): () => Observable<R>;\n static create<T, R>(callbackFunc: (v1: T, callback: (err: any, result: R) => any) => any, selector?: void, scheduler?: IScheduler): (v1: T) => Observable<R>;\n static create<T, T2, R>(callbackFunc: (v1: T, v2: T2, callback: (err: any, result: R) => any) => any, selector?: void, scheduler?: IScheduler): (v1: T, v2: T2) => Observable<R>;\n static create<T, T2, T3, R>(callbackFunc: (v1: T, v2: T2, v3: T3, callback: (err: any, result: R) => any) => any, selector?: void, scheduler?: IScheduler): (v1: T, v2: T2, v3: T3) => Observable<R>;\n static create<T, T2, T3, T4, R>(callbackFunc: (v1: T, v2: T2, v3: T3, v4: T4, callback: (err: any, result: R) => any) => any, selector?: void, scheduler?: IScheduler): (v1: T, v2: T2, v3: T3, v4: T4) => Observable<R>;\n static create<T, T2, T3, T4, T5, R>(callbackFunc: (v1: T, v2: T2, v3: T3, v4: T4, v5: T5, callback: (err: any, result: R) => any) => any, selector?: void, scheduler?: IScheduler): (v1: T, v2: T2, v3: T3, v4: T4, v5: T5) => Observable<R>;\n static create<T, T2, T3, T4, T5, T6, R>(callbackFunc: (v1: T, v2: T2, v3: T3, v4: T4, v5: T5, v6: T6, callback: (err: any, result: R) => any) => any, selector?: void, scheduler?: IScheduler): (v1: T, v2: T2, v3: T3, v4: T4, v5: T5, v6: T6) => Observable<R>;\n static create<T>(callbackFunc: Function, selector?: void, scheduler?: IScheduler): (...args: any[]) => Observable<T>;\n static create<T>(callbackFunc: Function, selector?: (...args: any[]) => T, scheduler?: IScheduler): (...args: any[]) => Observable<T>;\n /* tslint:enable:max-line-length */\n\n /**\n * Converts a Node.js-style callback API to a function that returns an\n * Observable.\n *\n * <span class=\"informal\">It's just like {@link bindCallback}, but the\n * callback is expected to be of type `callback(error, result)`.</span>\n *\n * `bindNodeCallback` is not an operator because its input and output are not\n * Observables. The input is a function `func` with some parameters, but the\n * last parameter must be a callback function that `func` calls when it is\n * done. The callback function is expected to follow Node.js conventions,\n * where the first argument to the callback is an error object, signaling\n * whether call was successful. If that object is passed to callback, it means\n * something went wrong.\n *\n * The output of `bindNodeCallback` is a function that takes the same\n * parameters as `func`, except the last one (the callback). When the output\n * function is called with arguments, it will return an Observable.\n * If `func` calls its callback with error parameter present, Observable will\n * error with that value as well. If error parameter is not passed, Observable will emit\n * second parameter. If there are more parameters (third and so on),\n * Observable will emit an array with all arguments, except first error argument.\n *\n * Optionally `bindNodeCallback` accepts selector function, which allows you to\n * make resulting Observable emit value computed by selector, instead of regular\n * callback arguments. It works similarly to {@link bindCallback} selector, but\n * Node.js-style error argument will never be passed to that function.\n *\n * Note that `func` will not be called at the same time output function is,\n * but rather whenever resulting Observable is subscribed. By default call to\n * `func` will happen synchronously after subscription, but that can be changed\n * with proper {@link Scheduler} provided as optional third parameter. Scheduler\n * can also control when values from callback will be emitted by Observable.\n * To find out more, check out documentation for {@link bindCallback}, where\n * Scheduler works exactly the same.\n *\n * As in {@link bindCallback}, context (`this` property) of input function will be set to context\n * of returned function, when it is called.\n *\n * After Observable emits value, it will complete immediately. This means\n * even if `func` calls callback again, values from second and consecutive\n * calls will never appear on the stream. If you need to handle functions\n * that call callbacks multiple times, check out {@link fromEvent} or\n * {@link fromEventPattern} instead.\n *\n * Note that `bindNodeCallback` can be used in non-Node.js environments as well.\n * \"Node.js-style\" callbacks are just a convention, so if you write for\n * browsers or any other environment and API you use implements that callback style,\n * `bindNodeCallback` can be safely used on that API functions as well.\n *\n * Remember that Error object passed to callback does not have to be an instance\n * of JavaScript built-in `Error` object. In fact, it does not even have to an object.\n * Error parameter of callback function is interpreted as \"present\", when value\n * of that parameter is truthy. It could be, for example, non-zero number, non-empty\n * string or boolean `true`. In all of these cases resulting Observable would error\n * with that value. This means usually regular style callbacks will fail very often when\n * `bindNodeCallback` is used. If your Observable errors much more often then you\n * would expect, check if callback really is called in Node.js-style and, if not,\n * switch to {@link bindCallback} instead.\n *\n * Note that even if error parameter is technically present in callback, but its value\n * is falsy, it still won't appear in array emitted by Observable or in selector function.\n *\n *\n * @example <caption>Read a file from the filesystem and get the data as an Observable</caption>\n * import * as fs from 'fs';\n * var readFileAsObservable = Rx.Observable.bindNodeCallback(fs.readFile);\n * var result = readFileAsObservable('./roadNames.txt', 'utf8');\n * result.subscribe(x => console.log(x), e => console.error(e));\n *\n *\n * @example <caption>Use on function calling callback with multiple arguments</caption>\n * someFunction((err, a, b) => {\n * console.log(err); // null\n * console.log(a); // 5\n * console.log(b); // \"some string\"\n * });\n * var boundSomeFunction = Rx.Observable.bindNodeCallback(someFunction);\n * boundSomeFunction()\n * .subscribe(value => {\n * console.log(value); // [5, \"some string\"]\n * });\n *\n *\n * @example <caption>Use with selector function</caption>\n * someFunction((err, a, b) => {\n * console.log(err); // undefined\n * console.log(a); // \"abc\"\n * console.log(b); // \"DEF\"\n * });\n * var boundSomeFunction = Rx.Observable.bindNodeCallback(someFunction, (a, b) => a + b);\n * boundSomeFunction()\n * .subscribe(value => {\n * console.log(value); // \"abcDEF\"\n * });\n *\n *\n * @example <caption>Use on function calling callback in regular style</caption>\n * someFunction(a => {\n * console.log(a); // 5\n * });\n * var boundSomeFunction = Rx.Observable.bindNodeCallback(someFunction);\n * boundSomeFunction()\n * .subscribe(\n * value => {} // never gets called\n * err => console.log(err) // 5\n *);\n *\n *\n * @see {@link bindCallback}\n * @see {@link from}\n * @see {@link fromPromise}\n *\n * @param {function} func Function with a Node.js-style callback as the last parameter.\n * @param {function} [selector] A function which takes the arguments from the\n * callback and maps those to a value to emit on the output Observable.\n * @param {Scheduler} [scheduler] The scheduler on which to schedule the\n * callbacks.\n * @return {function(...params: *): Observable} A function which returns the\n * Observable that delivers the same values the Node.js callback would\n * deliver.\n * @static true\n * @name bindNodeCallback\n * @owner Observable\n */\n static create<T>(func: Function,\n selector: Function | void = undefined,\n scheduler?: IScheduler): (...args: any[]) => Observable<T> {\n return function(this: any, ...args: any[]): Observable<T> {\n return new BoundNodeCallbackObservable<T>(func, <any>selector, args, this, scheduler);\n };\n }\n\n constructor(private callbackFunc: Function,\n private selector: Function,\n private args: any[],\n private context: any,\n public scheduler: IScheduler) {\n super();\n }\n\n /** @deprecated internal use only */ _subscribe(subscriber: Subscriber<T | T[]>): Subscription {\n const callbackFunc = this.callbackFunc;\n const args = this.args;\n const scheduler = this.scheduler;\n let subject = this.subject;\n\n if (!scheduler) {\n if (!subject) {\n subject = this.subject = new AsyncSubject<T>();\n const handler = function handlerFn(this: any, ...innerArgs: any[]) {\n const source = (<any>handlerFn).source;\n const { selector, subject } = source;\n const err = innerArgs.shift();\n\n if (err) {\n subject.error(err);\n } else if (selector) {\n const result = tryCatch(selector).apply(this, innerArgs);\n if (result === errorObject) {\n subject.error(errorObject.e);\n } else {\n subject.next(result);\n subject.complete();\n }\n } else {\n subject.next(innerArgs.length <= 1 ? innerArgs[0] : innerArgs);\n subject.complete();\n }\n };\n // use named function instance to avoid closure.\n (<any>handler).source = this;\n\n const result = tryCatch(callbackFunc).apply(this.context, args.concat(handler));\n if (result === errorObject) {\n subject.error(errorObject.e);\n }\n }\n return subject.subscribe(subscriber);\n } else {\n return scheduler.schedule(dispatch, 0, { source: this, subscriber, context: this.context });\n }\n }\n}\n\ninterface DispatchState<T> {\n source: BoundNodeCallbackObservable<T>;\n subscriber: Subscriber<T>;\n context: any;\n}\n\nfunction dispatch<T>(this: Action<DispatchState<T>>, state: DispatchState<T>) {\n const self = (<Subscription> this);\n const { source, subscriber, context } = state;\n // XXX: cast to `any` to access to the private field in `source`.\n const { callbackFunc, args, scheduler } = source as any;\n let subject = source.subject;\n\n if (!subject) {\n subject = source.subject = new AsyncSubject<T>();\n\n const handler = function handlerFn(this: any, ...innerArgs: any[]) {\n const source = (<any>handlerFn).source;\n const { selector, subject } = source;\n const err = innerArgs.shift();\n\n if (err) {\n self.add(scheduler.schedule(dispatchError, 0, { err, subject }));\n } else if (selector) {\n const result = tryCatch(selector).apply(this, innerArgs);\n if (result === errorObject) {\n self.add(scheduler.schedule(dispatchError, 0, { err: errorObject.e, subject }));\n } else {\n self.add(scheduler.schedule(dispatchNext, 0, { value: result, subject }));\n }\n } else {\n const value = innerArgs.length <= 1 ? innerArgs[0] : innerArgs;\n self.add(scheduler.schedule(dispatchNext, 0, { value, subject }));\n }\n };\n // use named function to pass values in without closure\n (<any>handler).source = source;\n\n const result = tryCatch(callbackFunc).apply(context, args.concat(handler));\n if (result === errorObject) {\n self.add(scheduler.schedule(dispatchError, 0, { err: errorObject.e, subject }));\n }\n }\n\n self.add(subject.subscribe(subscriber));\n}\n\ninterface DispatchNextArg<T> {\n subject: AsyncSubject<T>;\n value: T;\n}\nfunction dispatchNext<T>(arg: DispatchNextArg<T>) {\n const { value, subject } = arg;\n subject.next(value);\n subject.complete();\n}\n\ninterface DispatchErrorArg<T> {\n subject: AsyncSubject<T>;\n err: any;\n}\nfunction dispatchError<T>(arg: DispatchErrorArg<T>) {\n const { err, subject } = arg;\n subject.error(err);\n}\n"]}
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