avalon2
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an elegant efficient express mvvm framework
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<title>Code coverage report for directives/for.js</title>
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<h1>
<a href="../index.html">all files</a> / <a href="index.html">directives/</a> for.js
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<div class='fl pad1y space-right2'>
<span class="strong">97.35% </span>
<span class="quiet">Statements</span>
<span class='fraction'>184/189</span>
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<div class='fl pad1y space-right2'>
<span class="strong">89.47% </span>
<span class="quiet">Branches</span>
<span class='fraction'>68/76</span>
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<div class='fl pad1y space-right2'>
<span class="strong">92.86% </span>
<span class="quiet">Functions</span>
<span class='fraction'>26/28</span>
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<div class='fl pad1y space-right2'>
<span class="strong">97.35% </span>
<span class="quiet">Lines</span>
<span class='fraction'>184/189</span>
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<div class='fl pad1y'>
<span class="strong">1 statement, 2 branches</span>
<span class="quiet">Ignored</span>
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<div class='status-line high'></div>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { avalon, createFragment, platform, isObject, ap } from '../seed/core'
import { VFragment } from '../vdom/VFragment'
import { addScope, makeHandle } from '../parser/index'
var rforAs = /\s+as\s+([$\w]+)/
var rident = /^[$a-zA-Z_][$a-zA-Z0-9_]*$/
var rinvalid = /^(null|undefined|NaN|window|this|\$index|\$id)$/
var rargs = /[$\w_]+/g
avalon.directive('for', {
delay: true,
priority: 3,
beforeInit: function() {
var str = this.expr,
asName
str = str.replace(rforAs, function(a, b) {
/* istanbul ignore if */
if (!rident.test(b) || rinvalid.test(b)) {
avalon.error('alias ' + b + ' is invalid --- must be a valid JS identifier which is not a reserved name.')
} else {
asName = b
}
return ''
})
var arr = str.split(' in ')
var kv = arr[0].match(rargs)
if (kv.length === 1) { //确保avalon._each的回调有三个参数
kv.unshift('$key')
}
this.expr = arr[1]
this.keyName = kv[0]
this.valName = kv[1]
this.signature = avalon.makeHashCode('for')
if (asName) {
this.asName = asName
}
delete this.param
},
init: function() {
var cb = this.userCb
if (typeof cb === 'string' && cb) {
var arr = addScope(cb, 'for')
var body = makeHandle(arr[0])
this.userCb = new Function('$event', 'var __vmodel__ = this\nreturn ' + body)
}
this.node.forDir = this //暴露给component/index.js中的resetParentChildren方法使用
this.fragment = ['<div>', this.fragment, '<!--', this.signature, '--></div>'].join('')
this.cache = {}
},
diff: function(newVal, oldVal) {
/* istanbul ignore if */
<span class="skip-if-branch" title="if path not taken" >I</span>if (this.updating) {
<span class="cstat-skip" title="statement not covered" > return</span>
}
this.updating = true
var traceIds = createFragments(this, newVal)
if (this.oldTrackIds === void 0)
return true
<span class="missing-if-branch" title="else path not taken" >E</span>if (this.oldTrackIds !== traceIds) {
this.oldTrackIds = traceIds
return true
}
},
update: function() {
if (!this.preFragments) {
this.fragments = this.fragments || []
mountList(this)
} else {
diffList(this)
updateList(this)
}
if (this.userCb) {
this.userCb.call(this.vm, {
type: 'rendered',
target: this.begin.dom,
signature: this.signature
})
}
delete this.updating
},
beforeDispose: function() {
this.fragments.forEach(function(el) {
el.dispose()
})
}
})
function getTraceKey(item) {
var type = typeof item
return item && type === 'object' ? item.$hashcode : type + ':' + item
}
//创建一组fragment的虚拟DOM
function createFragments(instance, obj) {
if (isObject(obj)) {
var array = Array.isArray(obj)
var ids = []
var fragments = [],
i = 0
instance.isArray = array
if (instance.fragments) {
instance.preFragments = instance.fragments
avalon.each(obj, function(key, value) {
var k = array ? getTraceKey(value) : <span class="branch-1 cbranch-no" title="branch not covered" >key</span>
fragments.push({
key: k,
val: value,
index: i++
})
ids.push(k)
})
instance.fragments = fragments
} else {
avalon.each(obj, function(key, value) {
var k = array ? getTraceKey(value) : key
fragments.push(new VFragment([], k, value, i++))
ids.push(k)
})
instance.fragments = fragments
}
return ids.join(';;')
} else {
return NaN
}
}
function mountList(instance) {
var args = instance.fragments.map(function(fragment, index) {
FragmentDecorator(fragment, instance, index)
saveInCache(instance.cache, fragment)
return fragment
})
var list = instance.parentChildren
var i = list.indexOf(instance.begin)
list.splice.apply(list, [i + 1, 0].concat(args))
}
function diffList(instance) {
var cache = instance.cache
var newCache = {}
var fuzzy = []
var list = instance.preFragments
list.forEach(function(el) {
el._dispose = true
})
instance.fragments.forEach(function(c, index) {
var fragment = isInCache(cache, c.key)
//取出之前的文档碎片
if (fragment) {
delete fragment._dispose
fragment.oldIndex = fragment.index
fragment.index = index // 相当于 c.index
resetVM(fragment.vm, instance.keyName)
fragment.vm[instance.keyName] = instance.isArray ? index : <span class="branch-1 cbranch-no" title="branch not covered" >fragment.key</span>
saveInCache(newCache, fragment)
} else {
//如果找不到就进行模糊搜索
fuzzy.push(c)
}
})
fuzzy.forEach(function(c) {
var fragment = fuzzyMatchCache(cache, c.key)
if (fragment) { //重复利用
fragment.oldIndex = fragment.index
fragment.key = c.key
var val = fragment.val = c.val
var index = fragment.index = c.index
fragment.vm[instance.valName] = val
fragment.vm[instance.keyName] = instance.isArray ? index : <span class="branch-1 cbranch-no" title="branch not covered" >fragment.key</span>
delete fragment._dispose
} else {
c = new VFragment([], c.key, c.val, c.index)
fragment = FragmentDecorator(c, instance, c.index)
list.push(fragment)
}
saveInCache(newCache, fragment)
})
instance.fragments = list
list.sort(function(a, b) {
return a.index - b.index
})
instance.cache = newCache
}
<span class="fstat-no" title="function not covered" >function updateItemVm(vm, top) {</span>
<span class="cstat-no" title="statement not covered" > for (var i in top) {</span>
<span class="cstat-no" title="statement not covered" > if (top.hasOwnProperty(i)) {</span>
<span class="cstat-no" title="statement not covered" > vm[i] = top[i]</span>
}
}
}
function resetVM(vm, a, b) {
vm.$accessors[a].value = NaN
}
function updateList(instance) {
var before = instance.begin.dom
var parent = before.parentNode
var list = instance.fragments
var end = instance.end.dom
for (var i = 0, item; item = list[i]; i++) {
if (item._dispose) {
list.splice(i, 1)
i--
item.dispose()
continue
}
if (item.oldIndex !== item.index) {
var f = item.toFragment()
var isEnd = before.nextSibling === null
parent.insertBefore(f, before.nextSibling);
<span class="missing-if-branch" title="if path not taken" >I</span>if (isEnd && <span class="branch-1 cbranch-no" title="branch not covered" >!parent.contains(end))</span> {
<span class="cstat-no" title="statement not covered" > parent.insertBefore(end, before.nextSibling)</span>
}
}
before = item.split
}
var ch = instance.parentChildren
var startIndex = ch.indexOf(instance.begin)
var endIndex = ch.indexOf(instance.end)
list.splice.apply(ch, [startIndex + 1, endIndex - startIndex].concat(list))
}
/**
*
* @param {type} fragment
* @param {type} this
* @param {type} index
* @returns { key, val, index, oldIndex, this, dom, split, vm}
*/
function FragmentDecorator(fragment, instance, index) {
var data = {}
data[instance.keyName] = instance.isArray ? index : fragment.key
data[instance.valName] = fragment.val
if (instance.asName) {
data[instance.asName] = instance.value
}
var vm = fragment.vm = platform.itemFactory(instance.vm, {
data: data
})
if (instance.isArray) {
vm.$watch(instance.valName, function(a) {
if (instance.value && instance.value.set) {
instance.value.set(vm[instance.keyName], a)
}
})
} else {
vm.$watch(instance.valName, <span class="fstat-no" title="function not covered" >function(a) {</span>
<span class="cstat-no" title="statement not covered" > instance.value[fragment.key] = a</span>
})
}
fragment.index = index
fragment.innerRender = avalon.scan(instance.fragment, vm, function() {
var oldRoot = this.root
ap.push.apply(fragment.children, oldRoot.children)
this.root = fragment
})
return fragment
}
// 新位置: 旧位置
function isInCache(cache, id) {
var c = cache[id]
if (c) {
var arr = c.arr
/* istanbul ignore if*/
if (arr) {
var r = arr.pop()
<span class="skip-if-branch" title="else path not taken" >E</span>if (!arr.length) {
c.arr = 0
}
return r
}
delete cache[id]
return c
}
}
//[1,1,1] number1 number1_ number1__
function saveInCache(cache, component) {
var trackId = component.key
if (!cache[trackId]) {
cache[trackId] = component
} else {
var c = cache[trackId]
var arr = c.arr || (c.arr = [])
arr.push(component)
}
}
var rfuzzy = /^(string|number|boolean)/
var rkfuzzy = /^_*(string|number|boolean)/
function fuzzyMatchCache(cache) {
var key
for (var id in cache) {
var key = id
break
}
if (key) {
return isInCache(cache, key)
}
}</pre></td></tr>
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