182 lines
5.4 KiB
JavaScript
182 lines
5.4 KiB
JavaScript
import { EventEmitter } from 'events'
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import { BehaviorSubject, from } from 'rxjs'
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import { distinctUntilChanged, skip } from 'rxjs/operators'
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// ** nested object access **
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import _get from 'get-value'
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import _set from 'set-value'
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import _del from 'unset-value'
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// *********************
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import equal from 'deep-equal'
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import traverse from 'traverse'
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import isPlainObject from 'is-plain-object'
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export default class RxClass extends EventEmitter {
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constructor(opts){
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// console.log('constructor', opts)
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super(opts)
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this._rx_ = {
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event: opts._rx_.event || 'changed',
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handler: opts._rx_.handler,
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props: {},
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hooks: [],
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operators:[],
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skip: opts._rx_.skip == null ? 1 : opts._rx_.skip
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}
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}
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// if property exists it moves value to _ version and creates getter and setter and behavior subject
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rxAdd(opath,opts={}) {
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const path = this._rxFormatPath(opath)
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if (opts.traverse) {
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const self = this
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traverse(_get(this,path)).map(function () {
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if (this.isLeaf) {
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const lpath = this.path
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lpath.unshift(path)
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// console.log('leaf',lpath,this.node)
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self.rxAdd(lpath)
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// console.log(this.get())
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}
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}
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)
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return
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} // end traverse
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const value = _get(this,path)
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if (value === undefined) {
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console.log ('no current property for', path)
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_set(this,path,null)
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}
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const {parent,name} = this.rxGetObj(path,'__parent__')
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const rx = this.setPath(['_rx_.props',path],{})
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rx.value = value
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rx.obs = from(new BehaviorSubject({value:value, path:path}).pipe(
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// rx.obs = from(new ReplaySubject(1).pipe(
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skip(this._rx_.skip),
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distinctUntilChanged()
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// ,
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// takeUntil(_get(this._deleted,path))
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))
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rx.subs = {}
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this.rxSubscribe(rx,this._rx_.handler,'_default')
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this.rxSubscribe(rx,(opts.subscribe ||{}).handler,(opts.subscribe || {}).name)
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const self = this
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Object.defineProperty(parent, name, {
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configurable: true,
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enumerable: true,
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get () {return rx.value},
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set (value) {
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rx.value = value
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rx.obs.next({value:value, path:path})
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self.emit(opts.event || self._rx_.event,{value:value, path:path})
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self.emit(path,value)
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self._rx_.hooks.forEach(hook=>hook.call(self,{value:value, path:path}))
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}
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})
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}
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// if name is only passed remove
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rxHook(func,name) {
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this._rx_.hooks[name]=func
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}
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// if name is only passed remove
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rxOperator(func,name) {
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this._rx_.operators[name]=func
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}
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// pass '__new__' when getting props for new rx object
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rxGetObj(path,prop) {
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path = this._rxFormatPath(path)
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path = path.split('.')
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const name = path.pop()
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path = path.join('.')
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let parent = path ? _get(this,path) : this
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// console.log(name,path,parent)
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if (parent === null) parent = {}
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if (prop==='__parent__') return {name:name, parent:parent, parentPath:path}
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const rx = this.getPath(['_rx_.props',path,name],true)
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// console.log(path,name,'reactive object',rx)
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return prop ? (rx || {})[prop] : rx
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}
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// removes obser, subscriptions, and getter and setter and make back into plain value
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rxRemove(path,opts={}) {
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if (opts.traverse) {
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const self = this
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traverse(_get(this,path)).map(function () {
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if (this.isLeaf) {
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const lpath = this.path
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lpath.unshift(path)
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self.rxRemove(lpath)
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}
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}
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)
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this.delPath(['_rx_.props',path],true)
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return
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}
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let { parent, name, parentPath } = this.rxGetObj(path,'__parent__')
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const rxparent = this.getPath(['_rx_.props',parentPath],true)
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const rx = rxparent[name]
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if (rx && Object.getOwnPropertyDescriptor(parent, name)['get']) {
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Object.values(rx.subs).forEach(sub=>sub.unsubscribe())
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delete parent[name]
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parent[name] = rx.value
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delete rxparent[name]
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} // else console.warn(`property at '${path}' was not reative, remove aborted`)
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}
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// pass rx as object or path
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rxSubscribe(rxObj,handler,name){
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// console.log('subscription',rxObj)
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if (typeof name !== 'string') return
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rxObj = (typeof rxObj === 'string') ? this.rxGetObj(rxObj) : rxObj
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if (typeof handler==='function') rxObj.subs[name] = rxObj.obs.subscribe(handler)
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}
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_rxFormatPath(path) {
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if (path==null) return path
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if (Array.isArray(path)) {
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path = path.filter(Boolean).join('.')
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} else path = path.replace(/\/:/g, '.')
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return path
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}
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setObjPath () {return _set(...arguments)}
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getObjPath () {return _get(...arguments)}
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delObjPath () { return _del(...arguments)}
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delPath(path,confirm) {
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path = this._rxFormatPath(path)
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if (confirm) _del(this,path)
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else console.warn('must confirm to delete path',path)
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}
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getPath(path,raw){
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path = this._rxFormatPath(path)
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const value = _get(this,path)
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if (!isPlainObject(value) || raw) return value
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let obj = {}
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traverse(_get(this,path)).map(function () {
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if (this.isLeaf) {
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// let leaf = this.path // this path is immutable
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// console.log(this.path,this.node)
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// leaf = leaf.pop()
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_set(obj,this.path.join('.'),this.node)
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}
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}
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)
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return obj
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}
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setPath(path,value){
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path = this._rxFormatPath(path)
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const curValue = _get(this,path)
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if (!equal(curValue,value) || !value) {
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_set(this,path,value)
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}
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return _get(this,path)
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}
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} // end class
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