Full refactor of State (now Observable)
* Renamed to Observable * Updated skooma.js to match the API
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2 changed files with 234 additions and 204 deletions
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@ -1,11 +1,28 @@
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/** @type FinalizationRegistry<AbortController> */
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const abortRegistry = new FinalizationRegistry(controller => controller.abort())
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/** @param {String} string */
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const camelToKebab = string => string.replace(/([a-z])([A-Z])/g, (_, a, b) => `${a}-${b.toLowerCase()}`)
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/** @param {String} string */
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const kebabToCamel = string => string.replace(/([a-z])-([a-z])/g, (_, a, b) => a+b.toUpperCase())
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export class ChangeEvent extends Event {
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const identity = object=>object
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const target = Symbol("Proxy Target")
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/* Custom Event Classes */
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export class SynchronousChangeEvent extends Event {
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constructor(change) {
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super('synchronous', {cancelable: true})
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this.change = change
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}
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}
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export class MultiChangeEvent extends Event {
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#final
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#values
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constructor(...changes) {
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super('change')
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this.changes = changes
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@ -40,27 +57,43 @@ export class ChangeEvent extends Event {
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}
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}
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export class SimpleState extends EventTarget {
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export class ValueChangeEvent extends MultiChangeEvent {
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get value() {
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return this.final.value
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}
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}
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/* Observable Classes */
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export class Observable extends EventTarget {
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#synchronous
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/** @type Array<{name:string, from, to}> */
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#queue
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#nested = new Map()
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#weakRef = new WeakRef(this)
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#abortController = new AbortController
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constructor({synchronous, methods}={}) {
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#ref = new WeakRef(this)
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get ref() { return this.#ref }
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observable = true
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constructor({synchronous}={}) {
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super()
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if (this.constructor === Observable) {
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throw new TypeError("Cannot instantiate abstract class")
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}
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this.#synchronous = !!synchronous
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abortRegistry.register(this, this.#abortController)
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// Try running a "<name>Changed" method for every changed property
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// Can be disabled to maybe squeeze out some performance
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if (methods ?? true) {
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this.addEventListener("change", ({final}) => {
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final.forEach((value, prop) => {
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if (`${prop}Changed` in this) this[`${prop}Changed`](value)
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})
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this.proxy = new Proxy(this.constructor.prototype.proxy, {
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get: (target, prop) => target.call(this, prop)
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})
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}
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proxy(prop, {get, set, ...options}={}) {
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const proxy = new ProxiedObservableValue(this, prop, options)
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if (get) proxy.get = get
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if (set) proxy.set = set
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return proxy
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}
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subscribe(prop, callback) {
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@ -74,152 +107,150 @@ export class SimpleState extends EventTarget {
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return () => controller.abort()
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}
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get() { return this.value }
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set(value) { this.value = value }
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emit(property, from, to, options={}) {
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const change = {property, from, to, ...options}
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enqueue(property, from, to, mutation=false) {
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const change = {property, from, to, mutation}
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if (!this.dispatchEvent(new SynchronousChangeEvent(change))) return false
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if (!this.synchronous) {
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if (!this.#queue) {
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this.#queue = []
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queueMicrotask(() => {
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this.dispatchEvent(new ChangeEvent(...this.#queue))
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this.emit(...this.#queue)
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this.#queue = undefined
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})
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}
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this.#queue.push(change)
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} else {
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this.dispatchEvent(new ChangeEvent([change]))
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this.emit(change)
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}
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return true
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}
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adopt(prop, state) {
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let handlers = this.#nested.get(state)
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if (!handlers) {
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// Actual adoption
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handlers = new Map()
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this.#nested.set(state, handlers)
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}
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const ref = this.#weakRef
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const handler = () => ref.deref()?.emit(prop, state, state, {state: true})
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handlers.set(prop, handler)
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state.addEventListener("change", handler, {signal: this.ignal})
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}
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disown(prop, state) {
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const handlers = this.#nested.get(state)
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const handler = handlers.get(prop)
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state.removeEventListener("change", handler)
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handlers.delete(prop)
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if (handlers.size == 0) {
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this.#nested.delete(state)
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}
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emit() {
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throw new TypeError(`${this.constructor.name} did not define an 'emit' method`)
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}
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get signal() { return this.#abortController.signal }
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get synchronous() { return this.#synchronous }
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}
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export class State extends SimpleState {
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#target
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export class ObservableObject extends Observable {
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#shallow
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static isState(object) { return SimpleState.prototype.isPrototypeOf(object) }
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constructor(target={}, {shallow, ...options}={}) {
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super(options)
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this.#shallow = !!shallow
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this.#target = target
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this[target] = target
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this.values = new Proxy(target, {
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set: (_target, prop, value) => {
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const old = this.get(prop)
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if (old !== value) {
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this.emit(prop, old, value)
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if (this.#shallow) {
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if (State.isState(old)) this.disown(prop, old)
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if (State.isState(value)) this.adopt(prop, value)
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}
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this.set(prop, value)
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}
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set: (target, prop, value) => {
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const old = target[prop]
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if (old === value) {
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return true
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} else {
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if (this.enqueue(prop, old, value)) {
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if (!this.#shallow) {
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if (old instanceof Observable) this.disown(prop, old)
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if (value instanceof Observable) this.adopt(prop, value)
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}
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target[prop] = value
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return true
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} else {
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return false
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}
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}
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},
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get: (_target, prop) => this.get(prop),
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get: (target, prop) => target[prop],
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})
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}
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forward(property="value", methods) {
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return new ForwardState(this, property, methods)
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proxy(prop, {get, set, ...options}={}) {
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const proxy = new ProxiedObservableValue(this, prop, {values: this.values, ...options})
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if (get) proxy.get = get
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if (set) proxy.set = set
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return proxy
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}
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set(prop, value) {
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if (arguments.length === 1) return this.set("value", prop)
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this.#target[prop] = value
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emit(...changes) {
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this.dispatchEvent(new MultiChangeEvent(...changes))
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}
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get(prop="value") {
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return this.#target[prop]
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/** @type Map<Observable, Map<String, Function>> */
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#nested = new Map()
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adopt(prop, observable) {
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let handlers = this.#nested.get(observable)
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if (!handlers) {
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// Actual adoption
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handlers = new Map()
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this.#nested.set(observable, handlers)
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}
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const ref = this.ref
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const handler = () => ref.deref()?.emit(prop, observable, observable, {observable: true})
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handlers.set(prop, handler)
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observable.addEventListener("change", handler, {signal: this.signal})
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}
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set value(value) { this.set(value) }
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get value() { return this.get() }
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disown(prop, observable) {
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const handlers = this.#nested.get(observable)
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const handler = handlers.get(prop)
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observable.removeEventListener("change", handler)
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handlers.delete(prop)
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if (handlers.size == 0) {
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this.#nested.delete(observable)
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}
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}
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}
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export class ForwardState extends SimpleState {
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#backend
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#property
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#methods
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export class ObservableValue extends Observable {
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#value
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constructor(backend, property, methods = {}) {
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super()
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this.#methods = methods
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this.#backend = backend
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this.#property = property
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const ref = new WeakRef(this)
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const abortController = new AbortController()
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abortRegistry.register(this, abortController)
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backend.addEventListener("change", event => {
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const state = ref.deref()
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if (state) {
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let relevantChanges = event.changes
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.filter(({property: name}) => name === property)
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const get = methods.get
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if (methods.get) {
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relevantChanges = relevantChanges.map(
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({from, to}) => ({property: "value", from: get(from), to: get(to)})
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)
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} else {
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relevantChanges = relevantChanges.map(
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({from, to}) => ({property: "value", from, to})
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)
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}
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if (relevantChanges.length > 0)
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state.dispatchEvent(new ChangeEvent(...relevantChanges))
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} else {
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abortController.abort()
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}
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}, {signal: abortController.signal})
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}
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get value() {
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const methods = this.#methods
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if (methods.get) {
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return methods.get(this.#backend.values[this.#property])
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} else {
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return this.#backend.values[this.#property]
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}
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constructor(value, options) {
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super(options)
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this.#value = value
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}
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get value() { return this.#value }
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set value(value) {
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const methods = this.#methods
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if (methods.set) {
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this.#backend.values[this.#property] = methods.set(value)
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} else {
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this.#backend.values[this.#property] = value
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if (this.enqueue("value", this.#value, value)) {
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this.#value = value
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}
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}
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emit(...changes) {
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this.dispatchEvent(new ValueChangeEvent(...changes))
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}
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}
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class ProxiedObservableValue extends ObservableValue {
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#backend
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#values
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#prop
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constructor(backend, prop, {values=backend, ...options}={}) {
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super(options)
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this.#backend = backend
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this.#values = values
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this.#prop = prop
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const ref = this.ref
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backend.addEventListener("synchronous", event => {
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const {property, from, to, ...rest} = event.change
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if (property == this.#prop) {
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ref.deref()?.enqueue({
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property,
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from: this.get(from),
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to: this.get(to),
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...rest
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})
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}
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}, { signal: this.signal })
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}
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get = identity
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set = identity
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get value() { return this.get(this.#values[this.#prop]) }
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set value(value) { this.#values[this.#prop] = this.set(value) }
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}
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const attributeObserver = new MutationObserver(mutations => {
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@ -242,7 +273,8 @@ export const component = (name, generator, methods) => {
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const Element = class extends HTMLElement{
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constructor() {
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super()
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this.state = new State(Object.fromEntries([...this.attributes].map(attribute => [kebabToCamel(attribute.name), attribute.value])))
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const target = Object.fromEntries([...this.attributes].map(attribute => [kebabToCamel(attribute.name), attribute.value]))
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this.state = new ObservableObject(target)
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this.state.addEventListener("change", event => {
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for (const {property, to: value} of event.changes) {
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const kebabName = camelToKebab(property)
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@ -251,7 +283,8 @@ export const component = (name, generator, methods) => {
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}
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})
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attributeObserver.observe(this, {attributes: true})
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this.replaceChildren(generator.call(this, this.state))
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const content = generator.call(this, this.state)
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if (content) this.replaceChildren(content)
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}
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}
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if (methods) {
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@ -261,7 +294,7 @@ export const component = (name, generator, methods) => {
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return Element;
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}
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class ComposedState extends SimpleState {
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class ObservableComposition extends ObservableValue {
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#func
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#states
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@ -276,9 +309,8 @@ class ComposedState extends SimpleState {
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const ref = new WeakRef(this)
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states.forEach(state => {
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state.addEventListener("change", event => {
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const value = event.final.get("value")
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if (value) ref.deref()?.scheduleUpdate()
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state.addEventListener("change", () => {
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ref.deref()?.scheduleUpdate()
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}, {signal: abortController.signal})
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})
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@ -295,26 +327,24 @@ class ComposedState extends SimpleState {
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this.#microtaskQueued = false
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this.update()
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})
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}
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this.#microtaskQueued = true
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}
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}
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}
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update() {
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const value = this.#func(...this.#states.map(state => state.value))
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const change = {property: "value", from: this.value, to: value}
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this.value = value
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this.dispatchEvent(new ChangeEvent(change))
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this.emit(change)
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}
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}
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export const compose = func => (...states) => new ComposedState(func, {synchronous: false}, ...states)
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const eventName = "mutation"
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export const compose = func => (...states) => new ObservableComposition(func, {}, ...states)
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class MutationEvent extends Event {
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constructor() {
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super(eventName, {bubbles: true})
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super("mutation", {bubbles: true})
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}
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}
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@ -324,24 +354,24 @@ const mutationObserver = new MutationObserver(mutations => {
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}
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})
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export class DOMState extends SimpleState {
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#target
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export class ObservableElement extends Observable {
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#getValue
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#equal
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#old
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#value
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#changedValue = false
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constructor(target, options) {
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constructor(target, {get, equal, ...options}={}) {
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super(options)
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this.#target = target
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this.#getValue = options.get ?? (target => target.value)
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this.#equal = options.equal ?? ((a, b) => a===b)
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this[target] = target
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this.#old = this.#getValue(target)
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this.#getValue = get ?? (target => target.value)
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this.#equal = equal ?? ((a, b) => a===b)
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this.#value = this.#getValue(target)
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const controller = new AbortController()
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target.addEventListener(eventName, event=>{this.update(event)}, {signal: controller.signal})
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target.addEventListener("mutation", event => { this.update(event) }, {signal: controller.signal})
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abortRegistry.register(this, controller)
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mutationObserver.observe(target, {
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@ -352,22 +382,22 @@ export class DOMState extends SimpleState {
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})
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}
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get value() { return this.#old }
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get value() { return this.#value }
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update() {
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const current = this.#getValue(this.#target)
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const current = this.#getValue(this[target])
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if (this.#equal(this.#old, current)) return
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if (this.#equal(this.#value, current)) return
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this.#old = current
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this.#value = current
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if (this.synchronous) {
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this.dispatchEvent(new ChangeEvent(["value", current]))
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this.dispatchEvent(new MultiChangeEvent(["value", current]))
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} else {
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if (!this.#changedValue) {
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queueMicrotask(() => {
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this.#changedValue = false
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this.dispatchEvent(new ChangeEvent(["value", this.#changedValue]))
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this.dispatchEvent(new MultiChangeEvent(["value", this.#changedValue]))
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})
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this.#changedValue = current
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}
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@ -396,5 +426,3 @@ export class MapStorage extends Storage {
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this.#map.clear()
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}
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}
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export default State
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120
skooma.js
120
skooma.js
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@ -24,51 +24,6 @@ const insertStyles = (rule, styles) => {
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rule.setProperty(snakeToCSS(key), value.toString())
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}
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const processAttribute = (attribute) => {
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if (typeof attribute == "string" || typeof attribute == "number")
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return attribute
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else if (attribute && "join" in attribute)
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return attribute.join(" ")
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else
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return JSON.stringify(attribute)
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}
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const defined = (value, fallback) => typeof value != "undefined" ? value : fallback
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const getCustom = args => args.reduce(
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(current, argument) => Array.isArray(argument)
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? defined(getCustom(argument), current)
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: (argument && typeof argument == "object")
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? defined(argument.is, current)
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: current
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,undefined
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)
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export const isObservable = object => object
|
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&& typeof object == "object"
|
||||
&& !(object instanceof HTMLElement)
|
||||
&& object.subscribe
|
||||
|
||||
const toChild = arg => {
|
||||
if (typeof arg == "string" || typeof arg == "number")
|
||||
return document.createTextNode(arg)
|
||||
else if (arg instanceof HTMLElement)
|
||||
return arg
|
||||
else if (isObservable(arg))
|
||||
return reactiveChild(arg)
|
||||
}
|
||||
|
||||
const reactiveChild = observable => {
|
||||
let ref
|
||||
const abort = observable.subscribe(value => {
|
||||
if (ref && !ref.deref()) return abort()
|
||||
const child = toChild(value) ?? document.createComment("Placeholder for reactive content")
|
||||
untilDeathDoThemPart(child, observable)
|
||||
if (ref) ref.deref().replaceWith(child)
|
||||
ref = new WeakRef(child)
|
||||
})
|
||||
return ref.deref()
|
||||
}
|
||||
|
||||
const specialAttributes = {
|
||||
value: {
|
||||
get() { return this.value },
|
||||
|
|
@ -95,6 +50,47 @@ const specialAttributes = {
|
|||
}
|
||||
}
|
||||
|
||||
const processAttribute = (attribute) => {
|
||||
if (typeof attribute == "string" || typeof attribute == "number")
|
||||
return attribute
|
||||
else if (attribute && "join" in attribute)
|
||||
return attribute.join(" ")
|
||||
else
|
||||
return JSON.stringify(attribute)
|
||||
}
|
||||
|
||||
const defined = (value, fallback) => typeof value != "undefined" ? value : fallback
|
||||
const getCustom = args => args.reduce(
|
||||
(current, argument) => Array.isArray(argument)
|
||||
? defined(getCustom(argument), current)
|
||||
: (argument && typeof argument == "object")
|
||||
? defined(argument.is, current)
|
||||
: current
|
||||
,undefined
|
||||
)
|
||||
|
||||
export const isObservable = object => object && object.observable
|
||||
|
||||
const toElement = arg => {
|
||||
if (typeof arg == "string" || typeof arg == "number")
|
||||
return document.createTextNode(arg)
|
||||
else if (arg instanceof HTMLElement)
|
||||
return arg
|
||||
else if (isObservable(arg))
|
||||
return reactiveElement(arg)
|
||||
}
|
||||
|
||||
export const reactiveElement = observable => {
|
||||
const element = toElement(observable.value)
|
||||
untilDeathDoThemPart(element, observable)
|
||||
const ref = new WeakRef(element)
|
||||
observable.addEventListener("change", () => {
|
||||
const next = reactiveElement(observable)
|
||||
ref.deref()?.replaceWith(next)
|
||||
}, {once: true})
|
||||
return element
|
||||
}
|
||||
|
||||
const setAttribute = (element, attribute, value, cleanupSignal) => {
|
||||
const special = specialAttributes[attribute]
|
||||
if (isObservable(value))
|
||||
|
|
@ -114,19 +110,20 @@ const setAttribute = (element, attribute, value, cleanupSignal) => {
|
|||
|
||||
// (Two-way) binding between an attribute and a state container
|
||||
const setReactiveAttribute = (element, attribute, observable) => {
|
||||
untilDeathDoThemPart(element, observable)
|
||||
const multiAbort = new MultiAbortController()
|
||||
let old
|
||||
observable.subscribe(value => {
|
||||
old = value
|
||||
|
||||
observable.addEventListener("change", () => {
|
||||
multiAbort.abort()
|
||||
setAttribute(element, attribute, value, multiAbort.signal)
|
||||
setAttribute(element, attribute, observable.value, multiAbort.signal)
|
||||
})
|
||||
setAttribute(element, attribute, observable.value, multiAbort.signal)
|
||||
|
||||
const special = specialAttributes[attribute]
|
||||
if (special?.hook && observable.set) {
|
||||
if (special.hook) {
|
||||
untilDeathDoThemPart(element, observable)
|
||||
special.hook.call(element, () => {
|
||||
const value = special.get.call(element, attribute)
|
||||
if (value != old) observable.set(value)
|
||||
const current = special.get.call(element, attribute)
|
||||
if (current != observable.value) observable.value = current
|
||||
})
|
||||
}
|
||||
}
|
||||
|
|
@ -137,7 +134,7 @@ const processArgs = (element, ...args) => {
|
|||
if (arg instanceof Array) {
|
||||
processArgs(element, ...arg)
|
||||
} else {
|
||||
const child = toChild(arg)
|
||||
const child = toElement(arg)
|
||||
if (child)
|
||||
element.append(child)
|
||||
else if (arg === undefined || arg == null)
|
||||
|
|
@ -185,18 +182,23 @@ export const handle = fn => event => { event.preventDefault(); return fn(event)
|
|||
export const fragment = (...elements) => {
|
||||
const fragment = new DocumentFragment()
|
||||
for (const element of elements)
|
||||
fragment.append(element)
|
||||
fragment.append(toElement(element))
|
||||
return fragment
|
||||
}
|
||||
|
||||
// Turns a template literal into document fragment.
|
||||
// Strings are returned as text nodes.
|
||||
// Elements are inserted in between.
|
||||
/**
|
||||
Turns a template literal into document fragment.
|
||||
Strings are returned as text nodes.
|
||||
Elements are inserted in between.
|
||||
@param {Array<String>} literals
|
||||
@param {Array<any>} items
|
||||
@return {DocumentFragment}
|
||||
*/
|
||||
const textFromTemplate = (literals, items) => {
|
||||
const fragment = new DocumentFragment()
|
||||
for (const key in items) {
|
||||
fragment.append(document.createTextNode(literals[key]))
|
||||
fragment.append(items[key])
|
||||
fragment.append(toElement(items[key]))
|
||||
}
|
||||
fragment.append(document.createTextNode(literals.at(-1)))
|
||||
return fragment
|
||||
|
|
|
|||
Loading…
Reference in a new issue