avalon2
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an elegant efficient express mvvm framework
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<a href="../index.html">all files</a> / <a href="index.html">vmodel/</a> Computed.js
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<div class='fl pad1y space-right2'>
<span class="strong">93.22% </span>
<span class="quiet">Statements</span>
<span class='fraction'>55/59</span>
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<div class='fl pad1y space-right2'>
<span class="strong">66.67% </span>
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<span class='fraction'>12/18</span>
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<span class="strong">100% </span>
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<span class='fraction'>12/12</span>
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<div class='fl pad1y space-right2'>
<span class="strong">93.22% </span>
<span class="quiet">Lines</span>
<span class='fraction'>55/59</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { avalon } from '../seed/core'
import {
obid,
Mutation
} from './Mutation'
import {
collectDeps
} from './transaction'
function getBody(fn) {
var entire = fn.toString()
return entire.substring(entire.indexOf('{}') + 1, entire.lastIndexOf('}'))
}
//如果不存在三目,if,方法
let instability = /(\?|if\b|\(.+\))/
function __create(o) {
var __ = function() {}
__.prototype = o
return new __
}
function __extends(child, parent) {
<span class="missing-if-branch" title="else path not taken" >E</span>if (typeof parent === 'function') {
var proto = child.prototype = __create(parent.prototype);
proto.constructor = child
}
}
export var Computed = (function(_super) {
__extends(Computed, _super);
function Computed(name, options, vm) { //构造函数
_super.call(this, name, undefined, vm)
delete options.get
delete options.set
avalon.mix(this, options)
this.deps = {}
this.type = 'computed'
this.depsVersion = {}
this.isComputed = true
this.trackAndCompute()
<span class="missing-if-branch" title="else path not taken" >E</span>if (!('isStable' in this)) {
this.isStable = !instability.test(getBody(this.getter))
}
}
var cp = Computed.prototype
cp.trackAndCompute = function() {
if (this.isStable && this.depsCount > 0) {
this.getValue()
} else {
collectDeps(this, this.getValue.bind(this))
}
}
cp.getValue = function() {
return this.value = this.getter.call(this.vm)
}
cp.schedule = function() {
var observers = this.observers;
var i = observers.length;
while (i--) {
<span class="cstat-no" title="statement not covered" > var d = observers[i];</span>
<span class="cstat-no" title="statement not covered" > if (d.schedule) {</span>
<span class="cstat-no" title="statement not covered" > d.schedule()</span>
}
}
}
cp.shouldCompute = function() {
<span class="missing-if-branch" title="else path not taken" >E</span>if (this.isStable) { //如果变动因子确定,那么只比较变动因子的版本
var toComputed = false
for (var i in this.deps) {
if (this.deps[i].version !== this.depsVersion[i]) {
toComputed = true
this.deps[i].version = this.depsVersion[i]
}
}
return toComputed
}
<span class="cstat-no" title="statement not covered" > return true</span>
}
cp.set = function() {
<span class="missing-if-branch" title="else path not taken" >E</span>if (this.setter) {
avalon.transaction(this.setter, this.vm, arguments)
}
}
cp.get = function() {
//当被设置了就不稳定,当它被访问了一次就是稳定
this.collect()
if (this.shouldCompute()) {
this.trackAndCompute()
// console.log('computed 2 分支')
this.updateVersion()
// this.reportChanged()
}
//下面这一行好像没用
return this.value
}
return Computed
}(Mutation));</pre></td></tr>
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Code coverage
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