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import {Subject} from "rxjs/Subject"; import {ReplaySubject} from "rxjs/ReplaySubject"; import 'rxjs/add/operator/map'; import 'rxjs/add/operator/filter'; import 'rxjs/add/operator/distinct'; export namespace StoRx { /** * */ export interface Store<S> { /** * create a view on the store pointing of a substate extracted by the @param mapFunction function * @param {(s: S) => T} map function to extract the substate the view will be based on * @param {(state: T, parentState: S) => S} mapReverse mapFunction function to reinject the substate in the parent state, this is used when the substate is updated * @returns {Store<T>} a view store on the substate */ mapFunction<T>(id:string, map: (s: S) => T, mapReverse: (state: T, parentState: S) => S): Store<T>; /** * create a view on the substate designed by the path * @param {string} path to the substate * @returns {Store<T>} a view store on 'path' substate */ map<T>(path: string): Store<T> /** * @returns {Observable<S>} an observable with the store state will be trigger when the state is updated */ observable(): Observable<S>; /** * trigger an action on the store that may then trigger reducer, the action will propagate to parent store * @param {A} action the action to trigger */ dispatch<A>(action: A); /** * @returns {ActionManager<S, A>} an action manager to be used to bind reducer to dispatched action */ action<A>(): ActionManager<S, A>; /** * * @param {{new() => A}} type type of action manage * @returns {ActionManager<S, A>} an action manager working on 'type' action */ actionByType<A>(type: new () => A): ActionManager<S, A>; /** * directly subscribe a reducer on an observable * @param {Observable<A>} actions the observable the reducer will subscribe * @param {(s: S, a: A) => S} reducer function */ subscribe<A>(actions: Observable<A>, reducer: (s: S, a: A) => S): void; /** * directly subscribe a reducer on an observable * @param {Observable<A>} actions the observable the reducer will subscribe * @param {(s: S, a: A) => S} reducer object */ subscribeReducer<A>(actions: Observable<A>, reducer: Reducer<S, A>): void; } /** * an action manager is a class to bind to reducer to store internal action dispatcher * it can also be use to monitor emitted action via the observable() */ export interface ActionManager<S, A> { /** * subscribe a reducer object to the action this manager handle * @param {Reducer<S, A>} reducer */ subscribeReducer(reducer: Reducer<S, A>): void; /** * subscribe a reducer function to the action this manager handle * @param {Reducer<S, A>} reducer */ subscribe(reducer: (s: S, a: A) => S): void; /** * * @returns {Observable<A>} the observable of the actions managed */ observable(): Observable<A>; /** * build a new actionManager that will handle the subset of action that pass the filter function * @param {(a: A) => boolean} filter function to filter actions * @returns {ActionManager<S, A>} the new action manage that handle the filtered actions */ filter(filter: (a: A) => boolean): ActionManager<S, A>; /** * * @returns {Store<S>} the store associated with this action manager */ getStore(): Store<S>; } export function createStore<S>(state: S): Store<S> { return new StoreImpl<S>(state); } interface Event<A> { source:string; event:A; } interface StoreDispatcher<S> extends Store<S> { /** * * @returns {Observable<A>} an observable of all the action emitted on the store */ actions<A>(): Observable<Event<A>>; dispatchWithSource<A>(action: A, source:string); /** * directly subscribe a reducer on an observable * @param {Observable<A>} actions the observable the reducer will subscribe * @param {(s: S, a: A) => S} reducer function */ subscribeEvent<A>(actions: Observable<Event<A>>, reducer: (s: S, a: A) => S): void; /** * directly subscribe a reducer on an observable * @param {Observable<A>} actions the observable the reducer will subscribe * @param {(s: S, a: A) => S} reducer object */ subscribeReducerEvent<A>(actions: Observable<Event<A>>, reducer: Reducer<S, A>): void; } class StoreUtils { public static createMapFunction<S, T>(path: string): (s: S) => T { let pathSplit: string[] = path.split("."); return s => { let current: any = s; for (let el of pathSplit) { current = current[el]; } return current; }; } public static createMapReverseFunction<S, T>(path: string): (state: T, parentState: S) => S { let pathSplit: string[] = path.split("."); return (s, p) => { let current: any = p; for (let i: number = 0; i < pathSplit.length - 1; i++) { current = current[pathSplit[i]]; } current[pathSplit[pathSplit.length - 1]] = s; return p; }; } } class StoreImpl<S> implements StoreDispatcher<S> { private stateSubject: Subject<S>; private currentState: S; private actionSubject: Subject<Event<any>>; constructor(private state: S) { this.stateSubject = new ReplaySubject(1); this.actionSubject = new Subject(); this.updateState(state); } protected updateState(state: S) { this.currentState = state; this.stateSubject.next(state); } subscribeReducer<A>(actions: Observable<A>, reducer: Reducer<S, A>): void { actions.subscribe(a => { let state: S = this.currentState; let newState: S = reducer.reduce(state, a); if (state != newState) { this.updateState(newState); } }) } subscribe<A>(actions: Observable<A>, reducer: (s: S, a: A) => S): void { this.subscribeReducer(actions, new ReducerFunction(reducer)); } subscribeEvent<A>(actions: Observable<Event<A>>, reducer: (s: S, a: A) => S): void { this.subscribe(actions.map(e=>e.event), reducer); } subscribeReducerEvent<A>(actions: Observable<Event<A>>, reducer: Reducer<S, A>): void { this.subscribeReducer(actions.map(e=>e.event), reducer); } mapFunction<T>(id:string, map: (s: S) => T, mapReverse: (state: T, parentState: S) => S): Store<T> { return new ViewStore(id, map, mapReverse, this); } map<T>(path: string): Store<T> { return new ViewStore<T, S>(path, <(s: S) => T>StoreUtils.createMapFunction(path), <(state: T, parentState: S) => S>StoreUtils.createMapReverseFunction(path), this); } public observable(): Observable<S> { return this.stateSubject; } dispatch<A>(action: A) { this.dispatchWithSource(action, ''); } dispatchWithSource<A>(action: A, source:string) { this.actionSubject.next({source:source, event:action}); } action<A>(): ActionManager<S, A> { return new ActionManagerImpl(this, this.actionSubject); } actionByType<A>(type: new () => A): ActionManager<S, A> { return new ActionManagerImpl(this, this.actionSubject.asObservable().filter(v => v.event instanceof type)); } actions<A>(): Observable<Event<A>> { return this.actionSubject; } } interface ActionManagerDispatcher<S, A> extends ActionManager<S, A> { observableEvent():Observable<Event<A>>; getStoreDispatcher():StoreDispatcher<S>; } class ActionManagerImpl<S, A> implements ActionManagerDispatcher<S, A> { constructor(private store: StoreDispatcher<S>, private obs: Observable<Event<A>>) { } subscribeReducer(reducer: Reducer<S, A>): void { this.getStoreDispatcher().subscribeReducerEvent(this.observableEvent(), reducer); } subscribe(reducer: (s: S, a: A) => S): void { this.getStoreDispatcher().subscribeEvent(this.observableEvent(), reducer); } observable(): Observable<A> { return this.obs.map(e=>e.event); } observableEvent(): Observable<Event<A>> { return this.obs; } filter(filter: (a: A) => boolean): ActionManager<S, A> { return new FilterActionManager(this, filter); } getStore(): Store<S> { return this.store; } getStoreDispatcher(): StoreDispatcher<S> { return this.store; } } class FilterActionManager<S, A> implements ActionManagerDispatcher<S, A> { constructor(private parent: ActionManagerDispatcher<S, A>, private filterFunction: (a: A) => boolean) { } subscribeReducer(reducer: Reducer<S, A>): void { this.getStoreDispatcher().subscribeReducerEvent(this.observableEvent(), reducer); } subscribe(reducer: (s: S, a: A) => S): void { this.getStoreDispatcher().subscribeEvent(this.observableEvent(), reducer); } observable(): Observable<A> { return this.parent.observable().filter(this.filterFunction); } observableEvent(): Observable<Event<A>> { return this.parent.observableEvent().filter(e=>this.filterFunction(e.event)); } filter(filter: (a: A) => boolean): ActionManager<S, A> { return new FilterActionManager(this, filter); } getStore(): Store<S> { return this.parent.getStore(); } getStoreDispatcher(): StoreDispatcher<S> { return this.parent.getStoreDispatcher(); } } class ViewStore<S, P> implements StoreDispatcher<S> { constructor(private id:string, private mapFunc: (s: P) => S, private mapReverseFunction: (state: S, parentState: P) => P, private store: StoreDispatcher<P>) { } public observable(): Observable<S> { return this.store.observable().map(this.mapFunc).distinct(); } dispatch<A>(action: A) { this.store.dispatchWithSource(action, this.id); } dispatchWithSource<A>(action: A, source: string) { this.store.dispatchWithSource(action, source); } action<A>(): ActionManager<S, A> { return new ActionManagerImpl(this, this.store.actions()); } actionByType<A>(type: new () => A): ActionManager<S, A> { return new ActionManagerImpl(this, <Observable<Event<A>>>this.store.actions().filter(v => v.event instanceof type)); } subscribe<A>(actions: Observable<A>, reducer: (s: S, a: A) => S): void { this.store.subscribeReducer(actions, new ViewReducer(this.mapFunc, this.mapReverseFunction, new ReducerFunction(reducer))); } subscribeReducer<A>(actions: Observable<A>, reducer: Reducer<S, A>): void { this.store.subscribeReducer(actions, new ViewReducer(this.mapFunc, this.mapReverseFunction, reducer)); } subscribeEvent<A>(actions: Observable<Event<A>>, reducer: (s: S, a: A) => S): void { this.store.subscribeReducerEvent(actions.filter(event=> event.source.startsWith(this.id)), new ViewReducer(this.mapFunc, this.mapReverseFunction, new ReducerFunction(reducer))); } subscribeReducerEvent<A>(actions: Observable<Event<A>>, reducer: Reducer<S, A>): void { this.store.subscribeReducerEvent(actions.filter(event=> event.source.startsWith(this.id)), new ViewReducer(this.mapFunc, this.mapReverseFunction, reducer)); } public mapFunction<T>(id:string, map: (s: S) => T, mapReverse: (state: T, parentState: S) => S): Store<T> { return new ViewStore(this.id+"."+id, map, mapReverse, this); } public map<T>(path: string): Store<T> { return new ViewStore(this.id+"."+path, StoreUtils.createMapFunction(path), StoreUtils.createMapReverseFunction(path), this); } actions<A>(): Observable<Event<A>> { return this.store.actions(); } } class ViewReducer<P, S, A> implements Reducer<P, A> { constructor(private map: (s: P) => S, private mapReverse: (state: S, parentState: P) => P, private reducer: Reducer<S, A>) { } reduce(parentState: P, a: A): P { let state: S = this.map(parentState); let reduceState: S = this.reducer.reduce(state, a); let result: P = parentState; if (state != reduceState) { result = this.mapReverse(reduceState, Object.assign({}, parentState)); } return result; } } class ReducerFunction<S, A> implements Reducer<S, A> { constructor(private reducer: (s: S, a: A) => S) { } reduce(state: S, a: A): S { return this.reducer(state, a); } } export interface Reducer<S, A> { reduce(state: S, a: A): S; } } |