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* Reactive State Management System for Coherent.js
* Provides computed properties, watchers, and reactive updates
*/
import { globalErrorHandler, StateError } from '../utils/error-handler.js';
/**
* Observable wrapper for tracking state changes
*/
export class Observable {
constructor(value, options = {}) {
this._value = value;
this._observers = new Set();
this._computedDependents = new Set();
this._options = {
deep: options.deep !== false,
immediate: options.immediate !== false,
...options
};
}
get value() {
// Track dependency for computed properties
if (Observable._currentComputed) {
this._computedDependents.add(Observable._currentComputed);
}
return this._value;
}
set value(newValue) {
if (this._value === newValue && !this._options.deep) {
return;
}
const oldValue = this._value;
this._value = newValue;
// Notify observers
this._observers.forEach(observer => {
try {
observer(newValue, oldValue);
} catch (error) {
globalErrorHandler.handle(error, {
type: 'watcher-error',
context: { newValue, oldValue }
});
}
});
// Update computed dependents
this._computedDependents.forEach(computed => {
computed._invalidate();
});
}
watch(callback, options = {}) {
if (typeof callback !== 'function') {
throw new StateError('Watch callback must be a function');
}
const observer = (newValue, oldValue) => {
callback(newValue, oldValue, () => this.unwatch(observer));
};
this._observers.add(observer);
// Call immediately if requested
if (options.immediate !== false) {
observer(this._value, undefined);
}
// Return unwatch function
return () => this.unwatch(observer);
}
unwatch(observer) {
this._observers.delete(observer);
}
unwatchAll() {
this._observers.clear();
this._computedDependents.clear();
}
}
/**
* Computed property implementation
*/
class Computed extends Observable {
constructor(getter, options = {}) {
super(undefined, options);
this._getter = getter;
this._cached = false;
this._dirty = true;
if (typeof getter !== 'function') {
throw new StateError('Computed getter must be a function');
}
}
get value() {
if (this._dirty || !this._cached) {
this._compute();
}
return this._value;
}
set value(newValue) {
throw new StateError('Cannot set value on computed property');
}
_compute() {
const prevComputed = Observable._currentComputed;
Observable._currentComputed = this;
try {
const newValue = this._getter();
if (newValue !== this._value) {
const oldValue = this._value;
this._value = newValue;
// Notify observers
this._observers.forEach(observer => {
observer(newValue, oldValue);
});
}
this._cached = true;
this._dirty = false;
} catch (error) {
globalErrorHandler.handle(error, {
type: 'computed-error',
context: { getter: this._getter.toString() }
});
} finally {
Observable._currentComputed = prevComputed;
}
}
_invalidate() {
this._dirty = true;
this._computedDependents.forEach(computed => {
computed._invalidate();
});
}
}
// Static property for tracking current computed
Observable._currentComputed = null;
/**
* Reactive state container with advanced features
*/
export class ReactiveState {
constructor(initialState = {}, options = {}) {
this._state = new Map();
this._computed = new Map();
this._watchers = new Map();
this._middleware = [];
this._history = [];
this._options = {
enableHistory: options.enableHistory !== false,
maxHistorySize: options.maxHistorySize || 50,
enableMiddleware: options.enableMiddleware !== false,
deep: options.deep !== false,
...options
};
// Initialize state
Object.entries(initialState).forEach(([key, value]) => {
this.set(key, value);
});
}
/**
* Get reactive state value
*/
get(key) {
const observable = this._state.get(key);
return observable ? observable.value : undefined;
}
/**
* Set reactive state value
*/
set(key, value, options = {}) {
const config = { ...this._options, ...options };
// Run middleware
if (config.enableMiddleware) {
const middlewareResult = this._runMiddleware('set', { key, value, oldValue: this.get(key) });
if (middlewareResult.cancelled) {
return false;
}
value = middlewareResult.value !== undefined ? middlewareResult.value : value;
}
// Get or create observable
let observable = this._state.get(key);
if (!observable) {
observable = new Observable(value, config);
this._state.set(key, observable);
} else {
// Record history
if (config.enableHistory) {
this._addToHistory('set', key, observable.value, value);
}
observable.value = value;
}
return true;
}
/**
* Check if state has a key
*/
has(key) {
return this._state.has(key);
}
/**
* Delete state key
*/
delete(key) {
const observable = this._state.get(key);
if (observable) {
// Record history
if (this._options.enableHistory) {
this._addToHistory('delete', key, observable.value, undefined);
}
observable.unwatchAll();
this._state.delete(key);
return true;
}
return false;
}
/**
* Clear all state
*/
clear() {
// Record history
if (this._options.enableHistory) {
this._addToHistory('clear', null, this.toObject(), {});
}
// Cleanup observables
for (const observable of this._state.values()) {
observable.unwatchAll();
}
this._state.clear();
this._computed.clear();
this._watchers.clear();
}
/**
* Create computed property
*/
computed(key, getter, options = {}) {
if (typeof getter !== 'function') {
throw new StateError(`Computed property '${key}' getter must be a function`);
}
const computed = new Computed(getter, { ...this._options, ...options });
this._computed.set(key, computed);
return computed;
}
/**
* Get computed property value
*/
getComputed(key) {
const computed = this._computed.get(key);
return computed ? computed.value : undefined;
}
/**
* Watch state changes
*/
watch(key, callback, options = {}) {
if (typeof key === 'function') {
// Watch computed expression
return this._watchComputed(key, callback, options);
}
const observable = this._state.get(key);
if (!observable) {
throw new StateError(`Cannot watch undefined state key: ${key}`);
}
const unwatch = observable.watch(callback, options);
// Store watcher for cleanup
if (!this._watchers.has(key)) {
this._watchers.set(key, new Set());
}
this._watchers.get(key).add(unwatch);
return unwatch;
}
/**
* Watch computed expression
*/
_watchComputed(expression, callback, options = {}) {
const computed = new Computed(expression, options);
const unwatch = computed.watch(callback, options);
return unwatch;
}
/**
* Batch state updates
*/
batch(updates) {
if (typeof updates === 'function') {
// Batch function updates
const oldEnableHistory = this._options.enableHistory;
this._options.enableHistory = false;
try {
const result = updates(this);
// Record batch in history
if (oldEnableHistory) {
this._addToHistory('batch', null, null, this.toObject());
}
return result;
} finally {
this._options.enableHistory = oldEnableHistory;
}
} else if (typeof updates === 'object') {
// Batch object updates
return this.batch(() => {
Object.entries(updates).forEach(([key, value]) => {
this.set(key, value);
});
});
}
}
/**
* Subscribe to multiple state changes
*/
subscribe(keys, callback, options = {}) {
if (!Array.isArray(keys)) {
keys = [keys];
}
const unwatchers = keys.map(key => {
return this.watch(key, (newValue, oldValue) => {
callback({
key,
newValue,
oldValue,
state: this.toObject()
});
}, options);
});
// Return unsubscribe function
return () => {
unwatchers.forEach(unwatch => unwatch());
};
}
/**
* Add middleware for state changes
*/
use(middleware) {
if (typeof middleware !== 'function') {
throw new StateError('Middleware must be a function');
}
this._middleware.push(middleware);
}
/**
* Run middleware chain
*/
_runMiddleware(action, context) {
let result = { ...context, cancelled: false };
for (const middleware of this._middleware) {
try {
const middlewareResult = middleware(action, result);
if (middlewareResult) {
result = { ...result, ...middlewareResult };
if (result.cancelled) {
break;
}
}
} catch (error) {
globalErrorHandler.handle(error, {
type: 'middleware-error',
context: { action, middleware: middleware.toString() }
});
}
}
return result;
}
/**
* Add action to history
*/
_addToHistory(action, key, oldValue, newValue) {
if (!this._options.enableHistory) return;
this._history.unshift({
action,
key,
oldValue,
newValue,
timestamp: Date.now()
});
// Limit history size
if (this._history.length > this._options.maxHistorySize) {
this._history = this._history.slice(0, this._options.maxHistorySize);
}
}
/**
* Get state history
*/
getHistory(limit = 10) {
return this._history.slice(0, limit);
}
/**
* Undo last action
*/
undo() {
const lastAction = this._history.shift();
if (!lastAction) return false;
const { action, key, oldValue } = lastAction;
// Temporarily disable history
const oldEnableHistory = this._options.enableHistory;
this._options.enableHistory = false;
try {
switch (action) {
case 'set':
if (oldValue === undefined) {
this.delete(key);
} else {
this.set(key, oldValue);
}
break;
case 'delete':
this.set(key, oldValue);
break;
case 'clear':
this.clear();
Object.entries(oldValue || {}).forEach(([k, v]) => {
this.set(k, v);
});
break;
}
return true;
} finally {
this._options.enableHistory = oldEnableHistory;
}
}
/**
* Convert state to plain object
*/
toObject() {
const result = {};
for (const [key, observable] of this._state.entries()) {
result[key] = observable.value;
}
return result;
}
/**
* Convert computed properties to object
*/
getComputedValues() {
const result = {};
for (const [key, computed] of this._computed.entries()) {
result[key] = computed.value;
}
return result;
}
/**
* Get state statistics
*/
getStats() {
return {
stateKeys: this._state.size,
computedKeys: this._computed.size,
watcherKeys: this._watchers.size,
historyLength: this._history.length,
middlewareCount: this._middleware.length
};
}
/**
* Cleanup and destroy
*/
destroy() {
// Clear all watchers
for (const observable of this._state.values()) {
observable.unwatchAll();
}
for (const computed of this._computed.values()) {
computed.unwatchAll();
}
// Clear collections
this._state.clear();
this._computed.clear();
this._watchers.clear();
this._middleware.length = 0;
this._history.length = 0;
}
}
/**
* Create reactive state store
*/
export function createReactiveState(initialState, options = {}) {
return new ReactiveState(initialState, options);
}
/**
* Create observable value
*/
export function observable(value, options = {}) {
return new Observable(value, options);
}
/**
* Create computed property
*/
export function computed(getter, options = {}) {
return new Computed(getter, options);
}
/**
* Utility functions for common state patterns
*/
export const stateUtils = {
/**
* Create a toggle state
*/
toggle(initialValue = false) {
const obs = observable(initialValue);
obs.toggle = () => {
obs.value = !obs.value;
};
return obs;
},
/**
* Create a counter state
*/
counter(initialValue = 0) {
const obs = observable(initialValue);
obs.increment = (by = 1) => {
obs.value += by;
};
obs.decrement = (by = 1) => {
obs.value -= by;
};
obs.reset = () => {
obs.value = initialValue;
};
return obs;
},
/**
* Create an array state with utilities
*/
array(initialArray = []) {
const obs = observable([...initialArray]);
obs.push = (...items) => {
obs.value = [...obs.value, ...items];
};
obs.pop = () => {
const newArray = [...obs.value];
const result = newArray.pop();
obs.value = newArray;
return result;
};
obs.filter = (predicate) => {
obs.value = obs.value.filter(predicate);
};
obs.clear = () => {
obs.value = [];
};
return obs;
},
/**
* Create object state with deep reactivity
*/
object(initialObject = {}) {
const state = createReactiveState(initialObject, { deep: true });
return state;
}
};
export default ReactiveState; |