Internalize emitter implementation

This has a few benefits
- no longer need to shiv the difference between Component's emitter
  & Browserify's emitter (node version)
- no longer need to hack around Browserify's static require parsing
- able to drop methods not used in Vue
- able to add custom callback context control, as mentioned in #130

Author: yyx990803

.travis.yml

@@ -5,9 +5,7 @@ branches:
   only:
   - master
 before_install:
-- npm install -g grunt-cli component phantomjs casperjs
-before_script:
-- component install
+- npm install -g grunt-cli phantomjs casperjs
 env:
   global:
   - secure: Ce9jxsESszOnGyj3A6wILO5W412El9iD/HCHiFgbr8/cSXa4Yt0ZOEZysZeyaBX6IFUCjHtQPLasVgCxijDHrhi7/drmyCE+ksruk/6LJWn9C46PZK6nI+N04iYA2TRnocFllhGbyttpbpxY04smCmGWqXwLppu9nb+VIDkKGmE=

CONTRIBUTING.md

@@ -33,12 +33,12 @@ var a = superLongConditionalStatement
 
 ## Development Setup
 
-You will need [Node](http://nodejs.org), [Grunt](http://gruntjs.com), [Component](https://github.com/component/component), [PhantomJS](http://phantomjs.org) and [CasperJS](http://casperjs.org).
+You will need [Node](http://nodejs.org), [Grunt](http://gruntjs.com), [PhantomJS](http://phantomjs.org) and [CasperJS](http://casperjs.org).
 
 ``` bash
-# in case you don't already have them:
-# npm install -g grunt-cli component
-$ npm install && component install
+# in case you don't already it:
+# npm install -g grunt-cli
+$ npm install
 ```
 
 To watch and auto-build `dist/vue.js` during development:

component.json

@@ -30,8 +30,5 @@
         "src/directives/with.js",
         "src/directives/html.js",
         "src/directives/style.js"
-    ],
-    "dependencies": {
-        "component/emitter": "*"
-    }
+    ]
 }

src/compiler.js

@@ -57,6 +57,7 @@ function Compiler (vm, options) {
     compiler.computed = []
     compiler.childCompilers = []
     compiler.emitter = new Emitter()
+    compiler.emitter._ctx = vm
 
     // set inenumerable VM properties
     def(vm, '$', makeHash())

src/emitter.js

@@ -1,20 +1,73 @@
-// shiv to make this work for Component, Browserify and Node at the same time.
-var Emitter,
-    componentEmitter = 'emitter'
-
-try {
-    // Requiring without a string literal will make browserify
-    // unable to parse the dependency, thus preventing it from
-    // stopping the compilation after a failed lookup.
-    Emitter = require(componentEmitter)
-} catch (e) {
-    Emitter = require('events').EventEmitter
-    Emitter.prototype.off = function () {
-        var method = arguments.length > 1
-            ? this.removeListener
-            : this.removeAllListeners
-        return method.apply(this, arguments)
+function Emitter () {}
+
+var EmitterProto = Emitter.prototype,
+    slice = [].slice
+
+EmitterProto.on = function(event, fn){
+    this._cbs = this._cbs || {}
+    ;(this._cbs[event] = this._cbs[event] || [])
+        .push(fn)
+    return this
+}
+
+Emitter.prototype.once = function(event, fn){
+    var self = this
+    this._cbs = this._cbs || {}
+
+    function on() {
+        self.off(event, on)
+        fn.apply(this, arguments)
+    }
+
+    on.fn = fn
+    this.on(event, on)
+    return this
+}
+
+Emitter.prototype.off = function(event, fn){
+    this._cbs = this._cbs || {}
+
+    // all
+    if (!arguments.length) {
+        this._cbs = {}
+        return this
     }
+
+    // specific event
+    var callbacks = this._cbs[event]
+    if (!callbacks) return this
+
+    // remove all handlers
+    if (arguments.length === 1) {
+        delete this._cbs[event]
+        return this
+    }
+
+    // remove specific handler
+    var cb
+    for (var i = 0; i < callbacks.length; i++) {
+        cb = callbacks[i]
+        if (cb === fn || cb.fn === fn) {
+            callbacks.splice(i, 1)
+            break
+        }
+    }
+    return this
+}
+
+Emitter.prototype.emit = function(event){
+    this._cbs = this._cbs || {}
+    var args = slice.call(arguments, 1),
+        callbacks = this._cbs[event]
+
+    if (callbacks) {
+        callbacks = callbacks.slice(0)
+        for (var i = 0, len = callbacks.length; i < len; i++) {
+            callbacks[i].apply(this._ctx || this, args)
+        }
+    }
+
+    return this
 }
 
 module.exports = Emitter

test/unit/specs/observer.js

@@ -1,7 +1,7 @@
 describe('UNIT: Observer', function () {
 
     var Observer = require('vue/src/observer'),
-        Emitter  = require('emitter')
+        Emitter  = require('vue/src/emitter')
 
     describe('Observing Object', function () {