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import { createCollectionGetter } from './collection.js';
import { getDevTool } from './dev.js';
import { ObjectMutations, OBSERVER_KEYS } from './enum.js';
import { captureStack } from './exception.js';
import { linkable } from './internal.js';
import { getObserver, track } from './observation.js';
import {
BROADCASTER_REGISTRY,
CONTROLLER_REGISTRY,
INIT_REGISTRY,
META_REGISTRY,
MUTATOR_REGISTRY,
RELATION_REGISTRY,
STATE_BUSY_LIST,
STATE_REGISTRY,
} from './registry.js';
import type {
AnchorInternalFn,
Broadcaster,
KeyLike,
Linkable,
LinkableSchema,
ModelArray,
ModelError,
ModelObject,
ObjLike,
ParseResult,
StateChange,
StateMetadata,
StateRelation,
TrapOverrides,
} from './types.js';
import { isArray } from './utils/index.js';
/**
* Creates a getter trap function for a reactive state object.
*
* This function generates a Proxy handler that intercepts property access operations
* on reactive state objects. It handles various scenarios including:
* - Circular reference detection and resolution
* - Method binding for Set and Map instances
* - Recursive state anchoring for nested objects
* - Subscription linking for reactive dependencies
* - Schema validation for strict mode compliance
*
* @template T - The type of the reactive state object
* @template S - The type of the schema associated with the state
* @param init - The initial state object to create a getter for
* @param options - Optional state references containing configuration and metadata
* @returns A getter function that handles property access with reactive behavior
* @throws {Error} When called on a non-reactive state object
*/
export function createGetter<T extends Linkable>(init: T, options?: TrapOverrides) {
const meta = META_REGISTRY.get(init) as StateMetadata;
if (!meta) {
throw new Error(`Get trap factory called on non-reactive state.`);
}
const devTool = getDevTool();
const mutator = options?.mutator ?? MUTATOR_REGISTRY.get(init)?.mutatorMap;
const { link } = RELATION_REGISTRY.get(init) as StateRelation;
const { schema, observers, subscribers, subscriptions } = meta;
const { configs } = options ?? meta;
if (init instanceof Set || init instanceof Map) {
return createCollectionGetter(init as Set<unknown>, options as never);
}
const getter = (target: ObjLike, prop: KeyLike, receiver?: unknown) => {
const observer = getObserver();
if (configs.observable) {
track(init, observers, Array.isArray(init) ? OBSERVER_KEYS.ARRAY_MUTATIONS : prop);
}
if (configs.observable && observer) {
const trackProp = observer.assign(init, observers);
const tracked = trackProp(Array.isArray(init) ? OBSERVER_KEYS.ARRAY_MUTATIONS : prop);
if (!tracked && devTool?.onTrack) {
devTool.onTrack(meta, observer, Array.isArray(init) ? OBSERVER_KEYS.ARRAY_MUTATIONS : prop);
}
}
let value = Reflect.get(target, prop, receiver) as Linkable;
// Trigger the dev tool callback if available.
devTool?.onGet?.(meta, prop);
if (value === init) {
captureStack.violation.circular(prop, getter);
return INIT_REGISTRY.get(init) as T;
}
if (STATE_REGISTRY.has(value)) {
// Unwrap the value it the init was created with Anchor's state as the value.
// This to make sure that state always points to the underlying object.
value = STATE_REGISTRY.get(value) as Linkable;
Reflect.set(target, prop, value);
}
if (INIT_REGISTRY.has(value)) {
value = INIT_REGISTRY.get(value) as Linkable;
}
// If the value is an array method, set method, or map method,
// try to get the method trap from the mutator map.
if (mutator?.has(value)) {
return mutator.get(value);
}
if (configs.recursive && !CONTROLLER_REGISTRY.has(value) && linkable(value)) {
const childSchema = (
isArray(init)
? (schema as never as ModelArray)?.unwrap?.()
: (schema as never as ModelObject)?.shape?.[prop as string]
) as LinkableSchema;
value = (anchor as AnchorInternalFn)(value as T, { ...configs, schema: childSchema }, meta.root ?? meta, meta);
}
// Link if the value is a reactive state and there is an active subscription.
// Separating this process from creation is necessary to make sure
// reading an existing state is linked properly.
if (CONTROLLER_REGISTRY.has(value) && subscribers.size && !subscriptions.has(value)) {
if (!(configs.recursive === 'flat' && Array.isArray(target))) {
link(prop, value);
}
}
return value;
};
return getter;
}
/**
* Creates a setter trap function for a reactive state object.
*
* This function generates a Proxy handler that intercepts property assignment operations
* on reactive state objects. It handles various scenarios including:
* - Schema validation for strict mode compliance
* - Circular reference detection and prevention
* - Proper linking and unlinking of nested reactive states
* - Broadcasting of state changes to subscribers
* - Immutable state protection
*
* @template T - The type of the reactive state object
* @template S - The type of the schema associated with the state
* @param init - The initial state object to create a setter for
* @param options - Optional state references containing configuration and metadata
* @returns A setter function that handles property assignment with reactive behavior
* @throws {Error} When called on a non-reactive state object
*/
export function createSetter<T extends Linkable>(init: T, options?: TrapOverrides) {
const meta = META_REGISTRY.get(init) as StateMetadata;
if (!meta) {
throw new Error(`Set trap factory called on non-reactive state.`);
}
const devTool = getDevTool();
const broadcaster = BROADCASTER_REGISTRY.get(init) as Broadcaster;
const { unlink } = RELATION_REGISTRY.get(init) as StateRelation;
const { schema, subscriptions } = meta;
const { configs } = options ?? meta;
return (target: ObjLike, prop: KeyLike, value: Linkable, receiver?: unknown) => {
// Make sure to always work with the underlying object (if exist).
if (anchor.has(value)) value = anchor.get(value);
const current = Reflect.get(target, prop, receiver) as Linkable;
if (current === value) {
return true;
}
let error: ModelError | undefined;
if (schema) {
let validation: ParseResult<unknown>;
const childSchema = (schema as never as ModelObject)?.shape?.[prop as string];
if (childSchema) {
validation = childSchema.safeParse(value);
} else {
validation = schema.safeParse({ ...init, [prop as string]: value });
}
if (validation.success) {
value = validation.data as Linkable;
} else {
broadcaster.catch(validation.error as never, {
type: ObjectMutations.SET,
keys: [prop as string],
prev: current,
value,
});
if (!configs.safeParse) {
broadcaster.broadcast(
target,
{
type: ObjectMutations.SET,
keys: [prop as string],
prev: current,
error: validation.error as never,
value,
},
meta.id
);
return !configs.strict;
} else {
error = validation.error as never;
}
}
}
Reflect.set(target, prop, value, receiver);
if (INIT_REGISTRY.has(current)) {
const state = INIT_REGISTRY.get(current) as Linkable;
if (subscriptions.has(state)) {
unlink(state);
}
}
if (!STATE_BUSY_LIST.has(target)) {
const event: StateChange = {
type: ObjectMutations.SET,
keys: [prop as string],
prev: current,
error,
value: target[prop],
};
// Make sure to broadcast to subscribers first because observers might depend on a derived state.
broadcaster.broadcast(target, event, meta.id);
broadcaster.emit(event, prop);
// Trigger the dev tool callback if available.
devTool?.onSet?.(meta, prop, value);
}
return true;
};
}
/**
* Creates a remover trap function for a reactive state object.
*
* This function generates a Proxy handler that intercepts property deletion operations
* on reactive state objects. It handles various scenarios including:
* - Schema validation for strict mode compliance (ensuring deleted properties can accept undefined)
* - Proper unlinking of nested reactive states when deleted
* - Broadcasting of deletion events to subscribers
* - Circular reference handling
*
* @template T - The type of the reactive state object
* @template S - The type of the schema associated with the state
* @param init - The initial state object to create a remover for
* @param options - Optional state references containing configuration and metadata
* @returns A remover function that handles property deletion with reactive behavior
* @throws {Error} When called on a non-reactive state object
*/
export function createRemover<T extends Linkable>(init: T, options?: TrapOverrides) {
const meta = META_REGISTRY.get(init) as StateMetadata;
if (!meta) {
throw new Error(`Delete trap factory called on non-reactive state.`);
}
const devTool = getDevTool();
const broadcaster = BROADCASTER_REGISTRY.get(init) as Broadcaster;
const { unlink } = RELATION_REGISTRY.get(init) as StateRelation;
const { schema, subscriptions } = meta;
const { configs } = options ?? meta;
return (target: ObjLike, prop: KeyLike, receiver?: unknown) => {
// Escape directly if the property doesn't exist to prevent unnecessary work.
if (!Object.getOwnPropertyDescriptor(target, prop)) return true;
const current = Reflect.get(target, prop, receiver) as Linkable;
const childSchema = (schema as never as ModelObject)?.shape?.[prop as string];
let error: ModelError | undefined;
if (childSchema) {
const result = childSchema.safeParse(undefined);
if (!result.success) {
broadcaster.catch(result.error, {
type: ObjectMutations.DELETE,
prev: current,
keys: [prop as string],
});
if (!configs.safeParse) {
broadcaster.broadcast(
init,
{
type: ObjectMutations.DELETE,
prev: current,
keys: [prop as string],
error: result.error,
},
meta.id
);
return !configs.strict;
} else {
error = result.error;
}
}
}
Reflect.deleteProperty(target, prop);
if (INIT_REGISTRY.has(current)) {
const state = INIT_REGISTRY.get(current) as Linkable;
if (subscriptions.has(state)) {
unlink(state);
}
}
if (!STATE_BUSY_LIST.has(target)) {
const event: StateChange = {
type: ObjectMutations.DELETE,
prev: current,
keys: [prop],
error,
};
// Make sure to broadcast to subscribers first because observers might depend on a derived state.
broadcaster.broadcast(target, event, meta.id);
broadcaster.emit(event, prop);
// Trigger the dev tool callback if available.
devTool?.onDelete?.(meta, prop);
}
return true;
};
}
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