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| /**
* ------------------------------------------------------------
* avalon2.2.6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, config } from '../seed/core'
import { voidTag } from "./voidTag"
import { validateDOMNesting } from "./validateDOMNesting"
var specalTag = { xmp: 1, style: 1, script: 1, noscript: 1, textarea: 1, '#comment': 1, template: 1 }
var hiddenTag = { style: 1, script: 1, noscript: 1, template: 1 }
var rcontent = /\S/ //判定里面有没有内容
var rsp = /\s/
export function fromString(str) {
return from(str)
}
avalon.lexer = fromString
var strCache = new Cache(100)
function from(str) {
var cacheKey = str
var cached = strCache.get(cacheKey)
if (cached) {
return avalon.mix(true, [], cached)
}
var ret = parse(str, false)
strCache.put(cacheKey, avalon.mix(true, [], ret))
return ret
}
/**
*
*
* @param {any} string
* @param {any} getOne 只返回一个节点
* @returns
*/
function parse(string, getOne) {
getOne = (getOne === void 666 || getOne === true)
var ret = lexer(string, getOne)
Iif (getOne) {
return typeof ret[0] === 'string' ? ret[1] : ret[0]
}
return ret
}
function lexer(string, getOne) {
var tokens = []
var breakIndex = 9990
var stack = []
var origString = string
var origLength = string.length
stack.last = function() {
return stack[stack.length - 1]
}
var ret = []
function addNode(node) {
var p = stack.last()
if (p && p.children) {
p.children.push(node)
} else {
ret.push(node)
}
}
var lastNode
do {
Iif (--breakIndex === 0) {
break
}
var arr = getCloseTag(string)
if (arr) { //处理关闭标签
string = string.replace(arr[0], '')
const node = stack.pop()
Iif (!node) {
throw '是不是有属性值没有用引号括起'
}
//处理下面两种特殊情况：
//1. option会自动移除元素节点，将它们的nodeValue组成新的文本节点
//2. table会将没有被thead, tbody, tfoot包起来的tr或文本节点，收集到一个新的tbody元素中
if (node.nodeName === 'option') {
node.children = [{
nodeName: '#text',
nodeValue: getText(node)
}]
} else if (node.nodeName === 'table') {
insertTbody(node.children)
}
lastNode = null
Iif (getOne && ret.length === 1 && !stack.length) {
return [origString.slice(0, origLength - string.length), ret[0]]
}
continue
}
var arr = getOpenTag(string)
if (arr) {
string = string.replace(arr[0], '')
var node = arr[1]
addNode(node)
var selfClose = !!(node.isVoidTag || specalTag[node.nodeName])
if (!selfClose) { //放到这里可以添加孩子
stack.push(node)
}
Iif (getOne && selfClose && !stack.length) {
return [origString.slice(0, origLength - string.length), node]
}
lastNode = node
continue
}
var text = ''
do {
//处理<div><<<<<<div>的情况
const index = string.indexOf('<')
Iif (index === 0) {
text += string.slice(0, 1)
string = string.slice(1)
} else {
break
}
} while (string.length);
//处理<div>{aaa}</div>,<div>xxx{aaa}xxx</div>,<div>xxx</div>{aaa}sss的情况
const index = string.indexOf('<') //判定它后面是否存在标签
if (index === -1) {
text = string
string = ''
} else {
const openIndex = string.indexOf(config.openTag)
if (openIndex !== -1 && openIndex < index) {
if (openIndex !== 0) {
text += string.slice(0, openIndex)
}
var dirString = string.slice(openIndex)
var textDir = parseTextDir(dirString)
text += textDir
string = dirString.slice(textDir.length)
} else {
text += string.slice(0, index)
string = string.slice(index)
}
}
var mayNode = addText(lastNode, text, addNode)
if (mayNode) {
lastNode = mayNode
}
} while (string.length);
return ret
}
function addText(lastNode, text, addNode) {
if (rcontent.test(text)) {
if (lastNode && lastNode.nodeName === '#text') {
lastNode.nodeValue += text
return lastNode
} else {
lastNode = {
nodeName: '#text',
nodeValue: text
}
addNode(lastNode)
return lastNode
}
}
}
function parseTextDir(string) {
var closeTag = config.closeTag
var openTag = config.openTag
var closeTagFirst = closeTag.charAt(0)
var closeTagLength = closeTag.length
var state = 'code',
quote,
escape
for (var i = openTag.length, n = string.length; i < n; i++) {
var c = string.charAt(i)
switch (state) {
case 'code':
if (c === '"' || c === "'") {
state = 'string'
quote = c
} else if (c === closeTagFirst) { //如果遇到}
Eif (string.substr(i, closeTagLength) === closeTag) {
return string.slice(0, i + closeTagLength)
}
}
break
case 'string':
Iif (c === '\\' && /"'/.test(string.charAt(i + 1))) {
escape = !escape
}
if (c === quote && !escape) {
state = 'code'
}
break
}
}
throw '找不到界定符' + closeTag
}
var rtbody = /^(tbody|thead|tfoot)$/
function insertTbody(nodes) {
var tbody = false
for (var i = 0, n = nodes.length; i < n; i++) {
var node = nodes[i]
if (rtbody.test(node.nodeName)) {
tbody = false
continue
}
if (node.nodeName === 'tr') {
if (tbody) {
nodes.splice(i, 1)
tbody.children.push(node)
n--
i--
} else {
tbody = {
nodeName: 'tbody',
props: {},
children: [node]
}
nodes.splice(i, 1, tbody)
}
} else {
if (tbody) {
nodes.splice(i, 1)
tbody.children.push(node)
n--
i--
}
}
}
}
//<div>{{<div/>}}</div>
function getCloseTag(string) {
if (string.indexOf("</") === 0) {
var match = string.match(/\<\/(\w+[^\s\/\>]*)>/);
Eif (match) {
var tag = match[1]
string = string.slice(3 + tag.length)
return [match[0], {
nodeName: tag
}]
}
}
return null
}
var ropenTag = /\<(\w[^\s\/\>]*)/
function getOpenTag(string) {
if (string.indexOf("<") === 0) {
var i = string.indexOf('<!--') //处理注释节点
if (i === 0) {
var l = string.indexOf('-->')
Iif (l === -1) {
thow('注释节点没有闭合 ' + string.slice(0, 100))
}
var node = {
nodeName: '#comment',
nodeValue: string.slice(4, l)
}
return [string.slice(0, l + 3), node]
}
var match = string.match(ropenTag) //处理元素节点
Eif (match) {
var leftContent = match[0],
tag = match[1]
var node = {
nodeName: tag,
props: {},
children: []
}
string = string.replace(leftContent, '') //去掉标签名(rightContent)
try {
var arr = getAttrs(string) //处理属性
} catch (e) {}
Eif (arr) {
node.props = arr[1]
string = string.replace(arr[0], '')
leftContent += arr[0]
}
if (string.charAt(0) === '>') { //处理开标签的边界符
leftContent += '>'
string = string.slice(1)
if (voidTag[node.nodeName]) {
node.isVoidTag = true
}
} else Eif (string.slice(0, 2) === '/>') { //处理开标签的边界符
leftContent += '/>'
string = string.slice(2)
node.isVoidTag = true
}
if (!node.isVoidTag && specalTag[tag]) { //如果是script, style, xmp等元素
var closeTag = '</' + tag + '>'
var j = string.indexOf(closeTag)
var nodeValue = string.slice(0, j)
leftContent += nodeValue + closeTag
node.children.push({
nodeName: '#text',
nodeValue: nodeValue
})
if (tag === 'textarea') {
node.props.type = tag
node.props.value = nodeValue
}
}
return [leftContent, node]
}
}
}
function getText(node) {
var ret = ''
node.children.forEach(function(el) {
if (el.nodeName === '#text') {
ret += el.nodeValue
} else Eif (el.children && !hiddenTag[el.nodeName]) {
ret += getText(el)
}
})
return ret
}
function getAttrs(string) {
var state = 'AttrName',
attrName = '',
attrValue = '',
quote,
escape,
props = {}
for (var i = 0, n = string.length; i < n; i++) {
var c = string.charAt(i)
switch (state) {
case 'AttrName':
if (c === '/' && string.charAt(i + 1) === '>' || c === '>') {
Iif (attrName)
props[attrName] = attrName
return [string.slice(0, i), props]
}
if (rsp.test(c)) {
Iif (attrName) {
state = 'AttrEqual'
}
} else if (c === '=') {
Iif (!attrName) {
throw '必须指定属性名'
}
state = 'AttrQuote'
} else {
attrName += c
}
break
case 'AttrEqual':
if (c === '=') {
state = 'AttrQuote'
} else if (rcontent.test(c)) {
props[attrName] = attrName
attrName = c
state = 'AttrName'
}
break
case 'AttrQuote':
Eif (c === '"' || c === "'") {
quote = c
state = 'AttrValue'
escape = false
}
break
case 'AttrValue':
Iif (c === '\\' && /"'/.test(string.charAt(i + 1))) {
escape = !escape
}
if (c === '\n') {
break;
}
if (c !== quote) {
attrValue += c
} else Eif (c === quote && !escape) {
props[attrName] = attrValue
attrName = attrValue = ''
state = 'AttrName'
}
break
}
}
throw '必须关闭标签'
} |