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{ Observable } from '../Observable';\nimport { Subscriber } from '../Subscriber';\nimport { Subscription } from '../Subscription';\nimport { IScheduler } from '../Scheduler';\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 BoundCallbackObservable<T> extends Observable<T> {\n subject: AsyncSubject<T>;\n\n /* tslint:disable:max-line-length */\n static create(callbackFunc: (callback: () => any) => any, selector?: void, scheduler?: IScheduler): () => Observable<void>;\n static create<R>(callbackFunc: (callback: (result: R) => any) => any, selector?: void, scheduler?: IScheduler): () => Observable<R>;\n static create<T, R>(callbackFunc: (v1: T, callback: (result: R) => any) => any, selector?: void, scheduler?: IScheduler): (v1: T) => Observable<R>;\n static create<T, T2, R>(callbackFunc: (v1: T, v2: T2, callback: (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: (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: (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: (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: (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<R>(callbackFunc: (callback: (...args: any[]) => any) => any, selector: (...args: any[]) => R, scheduler?: IScheduler): () => Observable<R>;\n static create<T, R>(callbackFunc: (v1: T, callback: (...args: any[]) => any) => any, selector: (...args: any[]) => R, scheduler?: IScheduler): (v1: T) => Observable<R>;\n static create<T, T2, R>(callbackFunc: (v1: T, v2: T2, callback: (...args: any[]) => any) => any, selector: (...args: any[]) => R, scheduler?: IScheduler): (v1: T, v2: T2) => Observable<R>;\n static create<T, T2, T3, R>(callbackFunc: (v1: T, v2: T2, v3: T3, callback: (...args: any[]) => any) => any, selector: (...args: any[]) => R, 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: (...args: any[]) => any) => any, selector: (...args: any[]) => R, 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: (...args: any[]) => any) => any, selector: (...args: any[]) => R, 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: (...args: any[]) => any) => any, selector: (...args: any[]) => R, 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 callback API to a function that returns an Observable.\n *\n * <span class=\"informal\">Give it a function `f` of type `f(x, callback)` and\n * it will return a function `g` that when called as `g(x)` will output an\n * Observable.</span>\n *\n * `bindCallback` is not an operator because its input and output are not\n * Observables. The input is a function `func` with some parameters, the\n * last parameter must be a callback function that `func` calls when it is\n * done.\n *\n * The output of `bindCallback` is a function that takes the same parameters\n * as `func`, except the last one (the callback). When the output function\n * is called with arguments it will return an Observable. If function `func`\n * calls its callback with one argument the Observable will emit that value.\n * If on the other hand the callback is called with multiple values the resulting\n * Observable will emit an array with said values as arguments.\n *\n * It is very important to remember that input function `func` is not called\n * when the output function is, but rather when the Observable returned by the output\n * function is subscribed. This means if `func` makes an AJAX request, that request\n * will be made every time someone subscribes to the resulting Observable, but not before.\n *\n * Optionally, a selector function can be passed to `bindObservable`. The selector function\n * takes the same arguments as the callback and returns the value that will be emitted by the Observable.\n * Even though by default multiple arguments passed to callback appear in the stream as an array\n * the selector function will be called with arguments directly, just as the callback would.\n * This means you can imagine the default selector (when one is not provided explicitly)\n * as a function that aggregates all its arguments into an array, or simply returns first argument\n * if there is only one.\n *\n * The last optional parameter - {@link Scheduler} - can be used to control when the call\n * to `func` happens after someone subscribes to Observable, as well as when results\n * passed to callback will be emitted. By default, the subscription to an Observable calls `func`\n * synchronously, but using `Scheduler.async` as the last parameter will defer the call to `func`,\n * just like wrapping the call in `setTimeout` with a timeout of `0` would. If you use the async Scheduler\n * and call `subscribe` on the output Observable all function calls that are currently executing\n * will end before `func` is invoked.\n *\n * By default results passed to the callback are emitted immediately after `func` invokes the callback.\n * In particular, if the callback is called synchronously the subscription of the resulting Observable\n * will call the `next` function synchronously as well. If you want to defer that call,\n * you may use `Scheduler.async` just as before. This means that by using `Scheduler.async` you can\n * ensure that `func` always calls its callback asynchronously, thus avoiding terrifying Zalgo.\n *\n * Note that the Observable created by the output function will always emit a single value\n * and then complete immediately. If `func` calls the callback multiple times, values from subsequent\n * calls will not appear in the stream. If you need to listen for multiple calls,\n * you probably want to use {@link fromEvent} or {@link fromEventPattern} instead.\n *\n * If `func` depends on some context (`this` property) and is not already bound the context of `func`\n * will be the context that the output function has at call time. In particular, if `func`\n * is called as a method of some objec and if `func` is not already bound, in order to preserve the context\n * it is recommended that the context of the output function is set to that object as well.\n *\n * If the input function calls its callback in the \"node style\" (i.e. first argument to callback is\n * optional error parameter signaling whether the call failed or not), {@link bindNodeCallback}\n * provides convenient error handling and probably is a better choice.\n * `bindCallback` will treat such functions the same as any other and error parameters\n * (whether passed or not) will always be interpreted as regular callback argument.\n *\n *\n * @example <caption>Convert jQuery's getJSON to an Observable API</caption>\n * // Suppose we have jQuery.getJSON('/my/url', callback)\n * var getJSONAsObservable = Rx.Observable.bindCallback(jQuery.getJSON);\n * var result = getJSONAsObservable('/my/url');\n * result.subscribe(x => console.log(x), e => console.error(e));\n *\n *\n * @example <caption>Receive an array of arguments passed to a callback</caption>\n * someFunction((a, b, c) => {\n * console.log(a); // 5\n * console.log(b); // 'some string'\n * console.log(c); // {someProperty: 'someValue'}\n * });\n *\n * const boundSomeFunction = Rx.Observable.bindCallback(someFunction);\n * boundSomeFunction().subscribe(values => {\n * console.log(values) // [5, 'some string', {someProperty: 'someValue'}]\n * });\n *\n *\n * @example <caption>Use bindCallback with a selector function</caption>\n * someFunction((a, b, c) => {\n * console.log(a); // 'a'\n * console.log(b); // 'b'\n * console.log(c); // 'c'\n * });\n *\n * const boundSomeFunction = Rx.Observable.bindCallback(someFunction, (a, b, c) => a + b + c);\n * boundSomeFunction().subscribe(value => {\n * console.log(value) // 'abc'\n * });\n *\n *\n * @example <caption>Compare behaviour with and without async Scheduler</caption>\n * function iCallMyCallbackSynchronously(cb) {\n * cb();\n * }\n *\n * const boundSyncFn = Rx.Observable.bindCallback(iCallMyCallbackSynchronously);\n * const boundAsyncFn = Rx.Observable.bindCallback(iCallMyCallbackSynchronously, null, Rx.Scheduler.async);\n *\n * boundSyncFn().subscribe(() => console.log('I was sync!'));\n * boundAsyncFn().subscribe(() => console.log('I was async!'));\n * console.log('This happened...');\n *\n * // Logs:\n * // I was sync!\n * // This happened...\n * // I was async!\n *\n *\n * @example <caption>Use bindCallback on an object method</caption>\n * const boundMethod = Rx.Observable.bindCallback(someObject.methodWithCallback);\n * boundMethod.call(someObject) // make sure methodWithCallback has access to someObject\n * .subscribe(subscriber);\n *\n *\n * @see {@link bindNodeCallback}\n * @see {@link from}\n * @see {@link fromPromise}\n *\n * @param {function} func A function with a callback as the last parameter.\n * @param {function} [selector] A function which takes the arguments from the\n * callback and maps them to a value that is emitted 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 callback would deliver.\n * @static true\n * @name bindCallback\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 BoundCallbackObservable<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 private 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 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(BoundCallbackObservable.dispatch, 0, { source: this, subscriber, context: this.context });\n }\n }\n\n static dispatch<T>(state: { source: BoundCallbackObservable<T>, subscriber: Subscriber<T>, context: any }) {\n const self = (<Subscription><any>this);\n const { source, subscriber, context } = state;\n const { callbackFunc, args, scheduler } = source;\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 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 subject.error(errorObject.e);\n }\n }\n\n self.add(subject.subscribe(subscriber));\n }\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"]} |