import { toArray } from '../util/index'
let uid = 0
/**
* A dep is an observable that can have multiple
* directives subscribing to it.
*
* @constructor
*/
export default function Dep () {
this.id = uid++
this.subs = []
}
// the current target watcher being evaluated.
// this is globally unique because there could be only one
// watcher being evaluated at any time.
Dep.target = null
/**
* Add a directive subscriber.
*
* @param {Directive} sub
*/
Dep.prototype.addSub = function (sub) {
this.subs.push(sub)
}
/**
* Remove a directive subscriber.
*
* @param {Directive} sub
*/
Dep.prototype.removeSub = function (sub) {
this.subs.$remove(sub)
}
/**
* Add self as a dependency to the target watcher.
*/
Dep.prototype.depend = function () {
Dep.target.addDep(this)
}
/**
* Notify all subscribers of a new value.
*/
Dep.prototype.notify = function () {
// stablize the subscriber list first
var subs = toArray(this.subs)
for (var i = 0, l = subs.length; i < l; i++) {
subs[i].update()
}
}
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