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lib.js
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lib.js
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const { diff } = require('./util')
const { ADD, DELETE, OPERAT_MAP } = require('./const')
class TimeStampManager {
constructor (timeStamp = 0) {
this.timeStamp = timeStamp
}
getTimeStamp () {
this.timeStamp++
return this.timeStamp
}
setTimeStamp (timeStamp) {
this.timeStamp = timeStamp
}
updateTimeStamp (newTimeStamp) {
if (newTimeStamp > this.timeStamp) this.timeStamp = newTimeStamp
}
}
class IdManager {
constructor () {
this.id = 0
}
getId () {
this.id++
return this.id
}
}
class Id {
constructor (uid, timeStamp) {
this.uid = uid
this.timeStamp = timeStamp
}
bigger (id) {
if (this.timeStamp > id.timeStamp) return true
if (this.timeStamp === id.timeStamp && this.uid > id.uid) return true
return false
}
small (id) {
return !this.bigger(id)
}
equal (id) {
return id.uid === this.uid && id.timeStamp === this.timeStamp
}
toString () {
return `U${this.uid}@T${this.timeStamp}`
}
toJSON () {
const { uid, timeStamp } = this
return { uid, timeStamp }
}
}
const loadId = function (idInfo) {
if (idInfo === null) return null
const { uid, timeStamp } = idInfo
return new Id(uid, timeStamp)
}
const loadActionsInfo = function (actionsInfo) {
return JSON.parse(actionsInfo).map(action => {
const id = loadId(action.id)
const preId = loadId(action.preId)
const { operat, value } = action
return new Action(preId, id, operat, value)
})
}
class Action {
constructor (preId, id, operat, value) {
this.preId = preId
this.id = id
this.operat = operat
this.value = value
}
toString () {
return `${this.id.toString()}\t ${OPERAT_MAP[this.operat]}\t ${this.preId.toString()}\t ${this.value}`
}
toJSON () {
const { preId, id, operat, value } = this
return {
operat,
preId,
value,
id
}
}
}
class Word {
constructor (id, value, preId, operat) {
this.id = id
this.isDelete = false
this.preId = preId
this.operat = operat
this.value = value
}
delete () {
this.isDelete = true
}
}
class Info {
constructor (operat, chars) {
this.operat = operat
this.chars = chars
}
}
class Node {
constructor (word) {
this.word = word
this.nextNode = []
}
addNext (node) {
if (!this.hasNext(node)) {
this.nextNode.push(node)
this.nextNode = this.nextNode.sort((a, b) => a.word.id.bigger(b.word.id) ? 1 : -1)
return true
}
return false
}
toJSON () {
const { id, preId, operat, value } = this.word
return {
id,
preId,
operat,
value
}
}
hasNext (node) {
for (const n of this.nextNode) {
if (n.word.id.equal(node.word.id)) return true
}
return false
}
getNodeByposition (position) {
if (position <= 0) {
return this.word.id
}
for (let n of this.nextNode) {
if (!n.word.isDelete) {
position = position - 1
}
const re = n.getNodeByposition(position)
if (re !== null) return re
}
return null
}
getStr () {
const str = this.word.isDelete ? '' : this.word.value
if (this.nextNode.length === 0) {
return str
}
return str + this.nextNode.map(n => n.getStr()).join('')
}
}
class State {
constructor (timeStamp, uid) {
this.timeStampManager = new TimeStampManager(timeStamp)
this.uid = uid
this.nodes = new Map()
const id = new Id(0, 0)
const word = new Word(id, '', id, ADD)
this.tree = new Node(word)
this.nodes.set(id.toString(), this.tree)
}
createId () {
return new Id(this.uid, this.timeStampManager.getTimeStamp())
}
addOldActins (oldActions) {
const actions = []
let preId = null
for (let oldAction of oldActions) {
for (let info of oldAction.infos) {
let i = 0
const chars = info.chars.split('')
if (info.operat === DELETE) {
i = chars.length - 1
chars.reverse()
}
for (let char of chars) {
preId = this.getPreId(oldAction.position + i)
if (info.operat === DELETE) {
i--
} else {
i++
}
const id = this.createId()
const action = new Action(preId, id, info.operat, char)
this.addAction(action)
actions.push(action)
}
}
}
return actions
}
update (newStr) {
const oldStr = this.toString()
const oldActions = diff(oldStr, newStr)
this.addOldActins(oldActions)
return this.toString()
}
toString () {
return this.tree.getStr()
}
getPreId (position) {
return this.tree.getNodeByposition(position)
}
addAction (action) {
if (this.nodes.get(action.id.toString())) {
return
}
console.log(action.toString())
const node = this.nodes.get(action.preId.toString())
switch (action.operat) {
case ADD:
const id = action.id
const word = new Word(action.id, action.value, action.preId, action.operat)
const newNode = new Node(word)
this.nodes.set(id.toString(), newNode)
node.addNext(newNode)
break
case DELETE:
node.word.delete()
break
default:
}
this.timeStampManager.updateTimeStamp(action.id.timeStamp)
}
}
module.exports = {
loadActionsInfo,
TimeStampManager,
IdManager,
Action,
State,
Info,
Id
}