Merge pull request #1 from tusharmath/develop

Develop

Author: tusharmath

README.md

@@ -0,0 +1,30 @@
+# Observable Air
+
+[![Build Status](https://travis-ci.org/tusharmath/rwc.svg?branch=master)](https://travis-ci.org/tusharmath/observable-air)
+[![npm](https://img.shields.io/npm/v/observable-air.svg)](https://www.npmjs.com/package/observable-air)
+[![Coverage Status](https://coveralls.io/repos/github/tusharmath/observable-air/badge.svg)](https://coveralls.io/github/tusharmath/observable-air)
+
+A light weight and performance focused implementation of [Observables].
+Other mainstream (no pun intended) alternatives —
+
+[Observables]: https://github.com/tc39/proposal-observable
+
+- [most]
+- [rxjs]
+- [kefir]
+- [bacon]
+- [highland]
+- [zen observable]
+
+[most]:           https://github.com/cujojs/most
+[rxjs]:           https://github.com/ReactiveX/rxjs
+[kefir]:          https://rpominov.github.io/kefir/
+[bacon]:          https://baconjs.github.io/
+[highland]:       http://highlandjs.org/
+[zen observable]: https://github.com/zenparsing/zen-observable
+ 
+ ### Key Features
+ 
+  1. **Ultra high performance**  
+  2. **Small footprint**
+  3. **Ease of testability** 

package.json

@@ -3,24 +3,31 @@
   "description": "Observables for the calorie conscious",
   "main": "src/Observable",
   "scripts": {
-    "test": "ava",
-    "lint": "tslint ./src/**.ts",
-    "hydra": "node --trace-hydrogen --trace-phase=Z --trace-deopt --code-comments --hydrogen-track-positions --redirect-code-traces --redirect-code-traces-to=code.asm chore/benchmark.js",
-    "rfc": "node chore/rfc",
     "benchmark": "date >> benchmark.md && node chore/benchmark >> benchmark.md",
+    "cleanup": "rm -rf ./src/**/*.js && rm -rf ./src/**/*.map",
+    "coverage": "nyc npm test && nyc report --reporter=text-lcov | coveralls",
+    "hydra": "node --trace-hydrogen --trace-phase=Z --trace-deopt --code-comments --hydrogen-track-positions --redirect-code-traces --redirect-code-traces-to=code.asm chore/benchmark.js",
+    "lint": "tslint ./src/**.ts",
     "postinstall": "tsc",
-    "semantic-release": "semantic-release pre && npm publish && semantic-release post"
+    "rfc": "node chore/rfc",
+    "semantic-release": "semantic-release pre && npm publish && semantic-release post",
+    "test": "ava"
   },
   "author": "",
   "license": "ISC",
   "devDependencies": {
     "ava": "^0.16.0",
     "benchmark": "^2.1.1",
+    "coveralls": "^2.11.14",
     "cz-conventional-changelog": "^1.2.0",
     "es-observable-tests": "^0.3.0",
+    "ghooks": "^1.3.2",
+    "nyc": "^8.3.1",
     "semantic-release": "^4.3.5",
+    "tslint": "^3.15.1",
     "tslint-microsoft-contrib": "^2.0.12",
-    "typescript": "^2.0.3"
+    "typescript": "^2.0.3",
+    "validate-commit-msg": "^2.8.2"
   },
   "repository": {
     "type": "git",
@@ -29,6 +36,13 @@
   "config": {
     "commitizen": {
       "path": "./node_modules/cz-conventional-changelog"
+    },
+    "ghooks": {
+      "pre-commit": "npm run lint",
+      "commit-msg": "validate-commit-msg",
+      "pre-push": "npm test",
+      "post-merge": "npm install",
+      "post-rewrite": "npm install"
     }
   }
 }

src/Observable.ts

@@ -12,8 +12,15 @@ import {Subscription, CompositeSubscription} from './Subscription';
 import {SubscriptionObserver} from './SubscriptionObserver';
 import {SafeExecutor} from './lib/SafeExecutor';
 import {Safety} from './types/ISafeValue';
+import {ISubscriptionObserver} from './types/core/ISubscriptionObserver';
 
 
+function startObserver <T> (observer: IObserver<T>,
+                            subscription: CompositeSubscription) {
+  if (observer.start)
+    observer.start(subscription)
+}
+
 export class Observable<T> implements IObservable<T> {
   constructor (private func: ISubscriberFunction<T>) {
   }
@@ -27,21 +34,18 @@ export class Observable<T> implements IObservable<T> {
     })
   }
 
-  safelyExecuteFunc (observer: IObserver<T>, cSub: CompositeSubscription) {
-    const r = SafeExecutor(() => {
-      cSub.add(Subscription.from(this.func(SubscriptionObserver.from(observer))))
-    })
-    if (r.type === Safety.error && observer.error) {
-      observer.error(r.value as Error)
-    }
+  private safelyExecuteFunc (observer: ISubscriptionObserver<T>, cSub: CompositeSubscription) {
+    const r = SafeExecutor(() => cSub.add(Subscription.from(this.func(observer))))
+    if (r.type === Safety.error) observer.error(r.value as Error)
   }
 
-  subscribe (observer: IObserver<T>, scheduler: IScheduler = new DefaultScheduler()): ISubscription {
-    if (typeof observer !== 'object') throw new TypeError('Observer should be of object type')
+  subscribe (observer: IObserver<T> | ((t: T) => void), scheduler: IScheduler = new DefaultScheduler()): ISubscription {
+    const subObserver = SubscriptionObserver.from(observer)
     const subscription = new CompositeSubscription()
-    const task = () => this.safelyExecuteFunc(observer, subscription);
+    const task = () => this.safelyExecuteFunc(subObserver, subscription);
     subscription.add(scheduler.scheduleNow(task))
-    if (observer.start) observer.start(subscription)
+    startObserver(observer as IObserver<T>, subscription);
     return subscription
   }
+
 }

src/SubscriptionObserver.ts

@@ -5,42 +5,45 @@
 import {ISubscriptionObserver} from './types/core/ISubscriptionObserver';
 import {IObserver} from './types/core/IObserver';
 
-export class SubscriptionObserverStub <T> implements ISubscriptionObserver<T> {
-  closed: boolean;
-
-  next (val: T): void {
-  }
-
-  error (err: Error): void {
-  }
-
-  complete (): void {
-  }
+export function noop () {
+}
+export function defaultOnError (err: Error) {
+  throw err
 }
 
+
 export class SubscriptionObserver<T> implements ISubscriptionObserver<T> {
   closed: boolean;
 
-  constructor (private sink: IObserver<T>) {
+  constructor (private onNext: (val: T) => void,
+               private onError: (err: Error) => void,
+               private onComplete: () => void) {
     this.closed = false
   }
 
   next (val: T): void {
-    this.sink.next(val)
+    this.onNext(val)
   }
 
   error (err: Error): void {
-    this.sink.error(err)
+    this.onError(err)
   }
 
   complete (): void {
-    this.sink.complete()
+    this.onComplete()
     this.closed = true
   }
 
-  static from<T> (observer: IObserver<T>) {
-    if (!observer.next || !observer.complete || !observer.error)
-      return new SubscriptionObserverStub()
-    return new SubscriptionObserver(observer)
+  static from<T> (observer: IObserver<T> | ((t: T) => void)): ISubscriptionObserver<T> {
+    const type = typeof observer
+    if (type !== 'object' && type !== 'function') throw new TypeError()
+    if (observer instanceof SubscriptionObserver) return observer
+    if (typeof observer === 'function')
+      return new SubscriptionObserver(observer, defaultOnError, noop)
+    return new SubscriptionObserver(
+      observer.next ? (t: T) => observer.next(t) : noop,
+      observer.error ? (t: Error) => observer.error(t) : defaultOnError,
+      observer.complete ? () => observer.complete() : noop
+    )
   }
 }

src/testing/TestObservable.ts

@@ -16,6 +16,6 @@ export class TestObservable<T> implements IObservable<T> {
   }
 
   subscribe (observer: IObserver<T>, scheduler: IScheduler): ISubscription {
-    return Subscription.from(this.func(new SubscriptionObserver(observer)))
+    return Subscription.from(this.func(SubscriptionObserver.from(observer)))
   }
 }