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index.js
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index.js
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let tree = {}
let indexByID = {}
let indexByPath = {}
let indexCursorsByPath = {}
let indexCloneConstructors = {}
let parsedPathsCache = {}
const MAX_CHANGES = 1000
const REDO = {}
const UNDO = {}
let HISTORY_COUNTER = 0
// @todo a..zA..Z..0..99
// const alph = 'abcde'.split('')
const uniqID = new function() {
let id = +new Date
return () => id++
}
//
let eventStore = {}
function Event(){}
Event.prototype = {
e(){
const e = this._e;
return eventStore[e] || (eventStore[e] = {})
},
on(event, callback){
let events = this.e();
(events[event] || (events[event] = [])).push(callback)
},
off(event, callback){
let events = this.e();
events[event] && (
callback
? events[event].splice(events[event].indexOf(callback), 1)
: (events[event].length = 0)
)
},
emit(event /* , args... */){
let events = this.e();
if(events[event]) {
for(var i = 0; i < events[event].length; i++){
events[event][i].apply(this, Array.prototype.slice.call(arguments, 1));
}
}
},
get(){
applyPatches()
return clone(treeByPath(this._path))
}
}
//
const nextPatches = []
//
function addPatch(path, type, item) {
nextPatches.push(createPatch(path, type, item))
}
function createPatch(path, type, item) {
createRollback(path, type, item)
return REDO[HISTORY_COUNTER % MAX_CHANGES] = function(){
// createRollback(path, type, item)
if( type === 'push' ) {
const arr = treeByPath(path)
arr.push(createObj(item, path + '.' + arr.length))
emitChanges(path, 'push', item)
}
// REDO[HISTORY_COUNTER % MAX_CHANGES] = {path, type, item}
}
}
function createRollback(path, type, item) {
UNDO[++HISTORY_COUNTER % MAX_CHANGES] = function(){
if( type === 'push' ) {
const arr = treeByPath(path)
arr.pop()
// emitChanges(path, 'pop', item)
}
}
}
// @todo
// perf test .shift vs iterator + .length = 0
// perf test setTimeout vs reqanimframe?
function applyPatches( recursive ){
for(let patch; patch = nextPatches.shift(); patch());
recursive && setTimeout(applyPatches, 1)
}
function emitChanges(path, type, item){
path = parsePath(path)
while(path.length) {
selectByPath(path.join('.')).emit(type, item)
path.pop()
}
}
function createObj( obj, path ) {
const type = typeof obj
if(type === 'string') {return obj}
if(type === 'number') {return obj}
if(type === 'undefined') {return obj}
if(Array.isArray(obj)) {return obj}
if( obj && typeof obj === 'object') {
obj._id = uniqID()
path && (obj._path = path)
// @todo
// keys storage
Object.keys(obj).forEach(key => {
obj[key] = createObj(obj[key], path ? (path + '.' + key) : key)
})
indexByID[obj._id] = obj
}
return obj
}
function parsePath( path ) {
if( typeof path === 'string' ) {
return path.split('.') // parsedPathsCache[path] || (parsedPathsCache[path] = path.split('.'))
}
return path
}
// @todo
// path function
function treeByPath( path ) {
path = parsePath(path)
let result = tree
path.forEach(p => {
result = result[p]
// typeof p !== 'function'
// ? result = result[p]
// : result = result[p]
})
console.info(path, result);
return result
}
function selectByPath( _path ) {
if( indexCursorsByPath[_path] ) {
return indexCursorsByPath[_path]
}
const path = parsePath(_path)
let result = tree
path.forEach(p => {
typeof p !== 'function'
? result = result[p]
: result = result[p]
})
return indexCursorsByPath[_path] = makeCursor(result, _path)
}
function makeCursor( obj, path ){
const type = typeof obj
if(type === 'string') {return obj}
if(type === 'number') {return obj}
if(type === 'undefined') {return obj}
if(Array.isArray(obj)) {
return new BrevnoArray(obj, path)
}
if(obj && typeof obj === 'object') {
return new BrevnoObject(obj, path)
}
}
function clone(obj) {
return JSON.parse(JSON.stringify(obj))
}
function cloneInitial(obj) {
return JSON.parse(JSON.stringify(obj))
}
BrevnoArray.prototype = new Event
function BrevnoArray(arr, path) {
this._e = uniqID()
this._path = path
this.push = function(item){
addPatch(path, 'push', item)
return this
}
}
BrevnoObject.prototype = new Event
function BrevnoObject(arr, path) {
this._e = uniqID()
this._path = path
}
Brevno.prototype = new Event
function Brevno(){
applyPatches(true)
this.init = function(obj){
tree = createObj(cloneInitial(obj))
}
this.get = function(){
return clone(tree)
}
this.select = function( path ){
return selectByPath(path)
}
this.commit = applyPatches
this.computed = function(paths, get){
let computedState = {}
paths.forEach(p => {
selectByPath(p).on('update', function(){
computedState[p] = selectByPath(p).get()
})
})
}
this.undo = function(){
UNDO[(HISTORY_COUNTER--) % MAX_CHANGES]()
}
this.redo = function(){
REDO[++HISTORY_COUNTER % MAX_CHANGES]()
}
}
const state = new Brevno
const initial = {
appID : 123,
user : ({
user_id : 1,
is_admin: true,
badges : [{type: 1, label: 'best'}]
}),
items : [[1]]
}
state.init(initial)
// Events test
state.select('user.badges').on('push', function(i){log("from user.badges:", i)})
state.select('user').on('push', function(i){log("from user:", i)})
state.select('user.badges').push({type:2, label:'yeah!'})
state.commit()
// Off events
state.select('user.badges').off('push')
state.select('user').off('push')