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">vtree/</a> fromString.js
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<div class='fl pad1y space-right2'>
<span class="strong">96.35% </span>
<span class="quiet">Statements</span>
<span class='fraction'>132/137</span>
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<span class="strong">87.88% </span>
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<span class='fraction'>58/66</span>
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<span class="strong">100% </span>
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<span class='fraction'>14/14</span>
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<span class="strong">96.35% </span>
<span class="quiet">Lines</span>
<span class='fraction'>132/137</span>
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<div class='fl pad1y'>
<span class="strong">2 statements, 2 branches</span>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* ------------------------------------------------------------
* avalon2.1.1的新式lexer
* 将字符串变成一个虚拟DOM树,方便以后进一步变成模板函数
* 此阶段只会生成VElement,VText,VComment
* ------------------------------------------------------------
*/
import { avalon, Cache } from '../seed/core'
import { clearString, stringPool, fill, rfill } from "./clearString"
import { voidTag } from "./voidTag"
import { orphanTag } from "./orphanTag"
import { makeOrphan } from "./makeOrphan"
import { makeTbody } from "./makeTbody"
import { validateDOMNesting } from "./validateDOMNesting"
function nomalString(str) {
return avalon.unescapeHTML(str.replace(rfill, fill))
}
//https://github.com/rviscomi/trunk8/blob/master/trunk8.js
var ropenTag = /^<([-A-Za-z0-9_]+)\s*([^>]*?)(\/?)>/
var rendTag = /^<\/([^>]+)>/
var rtagStart = /[\!\/a-z]/i //闭标签的第一个字符,开标签的第一个英文,注释节点的!
var rlineSp = /\\n\s*/g
var rattrs = /([^=\s]+)(?:\s*=\s*(\S+))?/
var rcontent = /\S/ //判定里面有没有内容
export function fromString(str) {
return from(str)
}
avalon.lexer = fromString
var strCache = new Cache(100)
function AST() {}
AST.prototype = {
init(str) {
this.ret = []
var stack = []
stack.last = function() {
return stack[stack.length - 1]
}
this.stack = stack
this.str = str
},
gen() {
var breakIndex = 999999
do {
this.tryGenText()
this.tryGenComment()
this.tryGenOpenTag()
this.tryGenCloseTag()
var node = this.node
this.node = 0
<span class="missing-if-branch" title="if path not taken" >I</span>if (!node || --breakIndex === 0) {
<span class="cstat-no" title="statement not covered" > break</span>
}
if (node.end) {
if (node.nodeName === 'table') {
makeTbody(node.children)
}
delete node.end
}
} while (this.str.length);
return this.ret
},
fixPos: function(str, i) {
var tryCount = str.length - i
while (tryCount--) {
if (!rtagStart.test(str.charAt(i + 1))) {
i = str.indexOf('<', i + 1)
} else {
break
}
}
<span class="missing-if-branch" title="if path not taken" >I</span>if (tryCount === 0) {
<span class="cstat-no" title="statement not covered" > i = str.length</span>
}
return i
},
tryGenText() {
var str = this.str
if (str.charAt(0) !== '<') { //处理文本节点
var i = str.indexOf('<')
if (i === -1) {
i = str.length
} else if (!rtagStart.test(str.charAt(i + 1))) {
//处理`内容2 {{ (idx1 < < < 1 ? 'red' : 'blue' ) + a }} ` 的情况
i = this.fixPos(str, i)
}
var nodeValue = str.slice(0, i).replace(rfill, fill)
this.str = str.slice(i)
this.node = {
nodeName: '#text',
nodeValue: nodeValue
}
if (rcontent.test(nodeValue)) {
this.tryGenChildren() //不收集空白节点
}
}
},
tryGenComment() {
if (!this.node) {
var str = this.str
var i = str.indexOf('<!--') //处理注释节点
/* istanbul ignore if*/
if (i === 0) {
var l = str.indexOf('-->')
<span class="skip-if-branch" title="if path not taken" >I</span>if (l === -1) {
<span class="cstat-skip" title="statement not covered" > avalon.error('注释节点没有闭合' + str)</span>
}
var nodeValue = str.slice(4, l).replace(rfill, fill)
this.str = str.slice(l + 3)
this.node = {
nodeName: '#comment',
nodeValue: nodeValue
}
this.tryGenChildren()
}
}
},
tryGenOpenTag() {
if (!this.node) {
var str = this.str
var match = str.match(ropenTag) //处理元素节点开始部分
if (match) {
var nodeName = match[1]
var props = {}
if (/^[A-Z]/.test(nodeName) && avalon.components[nodeName]) {
props.is = nodeName
}
nodeName = nodeName.toLowerCase()
var isVoidTag = !!voidTag[nodeName] || match[3] === '\/'
var node = this.node = {
nodeName: nodeName,
props: {},
children: [],
isVoidTag: isVoidTag
}
var attrs = match[2]
if (attrs) {
this.genProps(attrs, node.props)
}
this.tryGenChildren()
str = str.slice(match[0].length)
if (isVoidTag) {
node.end = true
} else {
this.stack.push(node)
if (orphanTag[nodeName] || nodeName === 'option') {
var index = str.indexOf('</' + nodeName + '>')
var innerHTML = str.slice(0, index).trim()
str = str.slice(index)
makeOrphan(node, nodeName, nomalString(innerHTML))
}
}
this.str = str
}
}
},
tryGenCloseTag() {
if (!this.node) {
var str = this.str
var match = str.match(rendTag) //处理元素节点结束部分
<span class="missing-if-branch" title="else path not taken" >E</span>if (match) {
var nodeName = match[1].toLowerCase()
var last = this.stack.last()
/* istanbul ignore if*/
<span class="skip-if-branch" title="if path not taken" >I</span>if (!last) {
<span class="cstat-skip" title="statement not covered" > avalon.error(match[0] + '前面缺少<' + nodeName + '>')</span>
/* istanbul ignore else*/
} else <span class="missing-if-branch" title="if path not taken" >I</span>if (last.nodeName !== nodeName) {
<span class="cstat-no" title="statement not covered" > var errMsg = last.nodeName + '没有闭合,请注意属性的引号'</span>
<span class="cstat-no" title="statement not covered" > avalon.warn(errMsg)</span>
<span class="cstat-no" title="statement not covered" > avalon.error(errMsg)</span>
}
var node = this.stack.pop()
node.end = true
this.node = node
this.str = str.slice(match[0].length)
}
}
},
tryGenChildren() {
var node = this.node
var p = this.stack.last()
if (p) {
validateDOMNesting(p, node)
p.children.push(node)
} else {
this.ret.push(node)
}
},
genProps(attrs, props) {
while (attrs) {
var arr = rattrs.exec(attrs)
if (arr) {
var name = arr[1]
var value = arr[2] || <span class="branch-1 cbranch-no" title="branch not covered" >''</span>
attrs = attrs.replace(arr[0], '')
<span class="missing-if-branch" title="else path not taken" >E</span>if (value) {
//https://github.com/RubyLouvre/avalon/issues/1844
<span class="missing-if-branch" title="else path not taken" >E</span>if (value.indexOf('??') === 0) {
value = nomalString(value).
replace(rlineSp, '').
slice(1, -1)
}
}
<span class="missing-if-branch" title="else path not taken" >E</span>if (!(name in props)) {
props[name] = value
}
} else {
break
}
}
}
}
var vdomAst = new AST()
function from(str) {
var cacheKey = str
var cached = strCache.get(cacheKey)
if (cached) {
return avalon.mix(true, [], cached)
}
stringPool.map = {}
str = clearString(str)
vdomAst.init(str)
var ret = vdomAst.gen()
strCache.put(cacheKey, avalon.mix(true, [], ret))
return ret
}</pre></td></tr>
</table></pre>
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