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KeyLike,
Linkable,
StateChange,
StateMetadata,
StateObserver,
StateObserverList,
StatePublicTracker,
StateTracker,
} from './types.js';
import { captureStack } from './exception.js';
import { getDevTool } from './dev.js';
import { META_REGISTRY } from './registry.js';
import { shortId } from './utils/index.js';
import { isFunction } from '@beerush/utils';
import { ANCHOR_SETTINGS } from './constant.js';
let currentObserver: StateObserver | undefined = undefined;
let currentRestorer: (() => void) | undefined = undefined;
/**
* Sets the current observer context for state tracking.
* This function is used internally to manage the observer stack during state derivation.
*
* @param observer - The observer to set as the current context
* @returns A cleanup function that restores the previous observer context
*/
export function setObserver(observer: StateObserver) {
// Make sure it handles duplicate observer such as when evaluated in React's strict mode.
if (currentObserver === observer) return currentRestorer as () => void;
let restored = false;
const prevObserver = currentObserver;
const prevRestorer = currentRestorer;
currentObserver = observer;
currentRestorer = () => {
if (!restored) {
restored = true;
currentObserver = prevObserver;
currentRestorer = prevRestorer;
}
};
return currentRestorer;
}
/**
* Gets the current observer context.
*
* @returns The current observer or undefined if none is set
*/
export function getObserver(): StateObserver | undefined {
return currentObserver;
}
/**
* Creates a new observer instance for tracking state changes.
* An observer manages subscriptions and provides lifecycle hooks for state tracking.
*
* @param onChange - Callback function that will be called when state changes occur
* @param onTrack - Callback function that will be called when a new state is tracked
* @returns A new observer instance with states management, onChange handler, onDestroy hook, and cleanup functionality
*/
export function createObserver(
onChange: (event: StateChange) => void,
onTrack?: (state: Linkable, key: KeyLike) => void
): StateObserver {
let observedSize = 0;
const states = new WeakMap();
const destroyers = new Set<() => void>();
const track = ((state, key) => {
const keys = states.get(state) as Set<KeyLike>;
if (keys.has(key)) {
return true;
} else {
keys.add(key);
if (isFunction(onTrack)) {
onTrack(state, key);
}
}
return false;
}) satisfies StateTracker;
const destroy = () => {
for (const fn of destroyers) {
if (typeof fn === 'function') {
fn();
}
}
destroyers.clear();
};
const assign = ((init, observers) => {
if (!observers.has(observer)) {
observers.add(observer);
destroyers.add(() => {
states.delete(init);
observers.delete(observer);
getDevTool()?.onUntrack?.(META_REGISTRY.get(init) as StateMetadata, observer);
});
}
if (!states.has(init)) {
states.set(init, new Set());
if (ANCHOR_SETTINGS.safeObservation) {
observedSize += 1;
if (observedSize >= ANCHOR_SETTINGS.safeObservationThreshold) {
const error = new Error('Observation limit exceeded.');
captureStack.violation.general(
'Unsafe observation detected:',
`Attempted to observe too many (${observedSize}) states within a single observer.`,
error,
[
`We always recommend keeping observations small.`,
`- It's likely you are trying to perform an extensive read operation such as JSON.stringify during the observation phase.`,
`- Use the optimized reader utility such as "anchor.read" to perform an extensive operation while maintain immutability.`,
],
assign
);
}
}
}
return (key) => track(init, key);
}) satisfies StateObserver['assign'];
const run = <R>(fn: () => R): R => {
return withinObserver(fn, observer);
};
const observer = {
id: shortId(),
get states() {
return states;
},
get onChange() {
return onChange;
},
get destroy() {
return destroy;
},
get assign() {
return assign;
},
get run() {
return run;
},
};
return observer;
}
/**
* Executes a function within a specific observer context.
* This function temporarily sets the provided observer as the current context,
* executes the provided function, and then restores the previous observer context.
* It's useful for running code that should be tracked by a specific observer.
*
* @template R - The type of the return value of the function.
* @param {() => R} fn - The function to execute within the observer context
* @param {StateObserver} observer - The observer to set as the current context
*/
export function withinObserver<R>(fn: () => R, observer: StateObserver): R;
export function withinObserver<R>(observer: StateObserver, fn: () => R): R;
export function withinObserver<R>(observerOrFn: StateObserver | (() => R), fnOrObserver: (() => R) | StateObserver): R {
if (isFunction(observerOrFn)) return withinObserver(fnOrObserver as StateObserver, observerOrFn);
const restore = setObserver(observerOrFn);
let result: R | undefined = undefined;
if (typeof fnOrObserver === 'function') {
try {
result = fnOrObserver();
} catch (error) {
captureStack.error.external('Unable to execute the within observer function', error as Error, withinObserver);
}
} else {
const error = new Error('Invalid argument.');
captureStack.error.argument('The given argument is not a function', error, withinObserver);
}
restore?.();
return result as R;
}
/**
* Executes a function outside any observer context.
* This function temporarily removes the current observer context,
* executes the provided function, and then restores the previous observer context.
* It's useful for running code that shouldn't be tracked by the reactive system.
*
* @param fn - The function to execute outside of observer context
*/
export function outsideObserver<R>(fn: () => R): R {
const restore = setObserver(undefined as never);
let result: R | undefined = undefined;
if (typeof fn === 'function') {
try {
result = fn();
} catch (error) {
captureStack.error.external(
'Unable to execute the outside of observer function',
error as Error,
outsideObserver
);
}
} else {
const error = new Error('Invalid argument.');
captureStack.error.argument('The given argument is not a function', error, outsideObserver);
}
restore?.();
return result as R;
}
let currentTracker: StatePublicTracker | undefined;
let currentTrackerRestore: (() => void) | undefined;
/**
* Sets the current tracker function for state observation.
* This function manages the tracker stack, allowing for nested tracker contexts.
* If the same tracker is already set, it returns the existing restore function.
*
* A tracker is meant for library author to implement global tracking, which
* then they control how they track the state.
*
* @param tracker - The tracker function to set as current
* @returns A restore function that reverts to the previous tracker when called
*/
export function setTracker(tracker: StatePublicTracker) {
if (currentTracker === tracker) return currentTrackerRestore;
let restored = false;
const prevTracker = currentTracker;
currentTracker = tracker;
currentTrackerRestore = () => {
if (!restored) {
currentTracker = prevTracker;
restored = true;
}
};
return currentTrackerRestore;
}
/**
* Gets the current tracker function for state observation.
* This function returns the currently active tracker, which is used to monitor
* state changes and dependencies during reactive computations.
*
* @returns The current tracker function or undefined if no tracker is set
*/
export function getTracker(): StatePublicTracker | undefined {
return currentTracker;
}
/**
* Tracks a state change by invoking the current tracker function if one is set.
* This function is used internally by the reactive system to notify observers
* about state changes and their dependencies.
*
* @param init - The initial state value that is being tracked
* @param observers - A collection of observers that are watching this state
* @param key - The key or property identifier for the state change
*/
export function track(init: Linkable, observers: StateObserverList, key: KeyLike) {
if (typeof currentTracker !== 'function') return;
currentTracker(init, observers, key);
}
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