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import { ARRAY_MUTATION_KEYS, ARRAY_MUTATIONS, COLLECTION_MUTATION_KEYS } from './constant.js';
import { type ArrayMutations, BatchMutations, MapMutations, ObjectMutations, SetMutations } from './enum.js';
import { assign } from './helper.js';
import { INIT_GATEWAY_REGISTRY, STATE_REGISTRY } from './registry.js';
import type {
ArrayMutation,
ArrayMutator,
KeyLike,
Linkable,
MapMutator,
SetMutator,
StateChange,
StateGateway,
} from './types.js';
/**
* Replays a state change event on the given state.
*
* This function takes a state object and a state change event, then applies
* the change described in the event to the state. It handles various types
* of mutations including object property sets/deletes, map operations,
* set operations, array mutations, and batch assignments.
*
* The function uses a gateway system to perform the actual mutations,
* ensuring that the appropriate mutator methods are called based on
* the type of the target object (plain object, Map, Set, or Array).
*
* @template T - The type of the state object
* @param state - The state object to apply the change to
* @param event - The state change event to replay
*
* @internal
*/
export function replay<T>(state: T, event: StateChange) {
const init = STATE_REGISTRY.get(state as Linkable);
const { type, prev, value } = event;
const { key, target } = getEventTarget(init, event);
const gateway = INIT_GATEWAY_REGISTRY.get(target as Linkable) as StateGateway;
if (type === ObjectMutations.SET) {
gateway.setter(target, key, value, target);
} else if (type === MapMutations.SET) {
(gateway.mutator as MapMutator<unknown, unknown>).set(key, value);
} else if (type === SetMutations.ADD) {
(gateway.mutator as SetMutator<unknown>).add(value);
} else if (type === ObjectMutations.DELETE) {
gateway.remover(target, key, target);
} else if (type === MapMutations.DELETE || type === SetMutations.DELETE) {
if (target instanceof Map) {
(gateway.mutator as MapMutator<unknown, unknown>).delete(key);
} else if (target instanceof Set) {
(gateway.mutator as SetMutator<unknown>).delete(prev);
}
} else if (type === BatchMutations.ASSIGN) {
assign(anchor.find(target) as never, value as never);
} else if (type === MapMutations.CLEAR || type === SetMutations.CLEAR) {
if (target instanceof Map) {
(gateway.mutator as MapMutator<unknown, unknown>).clear();
} else if (target instanceof Set) {
(gateway.mutator as SetMutator<unknown>).clear();
}
} else if (ARRAY_MUTATIONS.includes(type as ArrayMutations)) {
((gateway.mutator as ArrayMutator<unknown>)[type as ArrayMutation] as (...args: unknown[]) => unknown)(
...(value as unknown[])
);
}
}
/**
* Reverts a state change event on the given state.
*
* This function takes a state object and a state change event, then undoes
* the change described in the event to revert the state back to its previous
* state. It handles various types of mutations including object property
* sets/deletes, map operations, set operations, array mutations, and batch assignments.
*
* The function uses a gateway system to perform the actual mutations,
* ensuring that the appropriate mutator methods are called based on
* the type of the target object (plain object, Map, Set, or Array).
*
* @template T - The type of the state object
* @param state - The state object to revert the change on
* @param event - The state change event to revert
*/
export function rollback<T>(state: T, event: StateChange) {
const init = STATE_REGISTRY.get(state as Linkable) as Linkable;
const { type, prev } = event;
const { key, target } = getEventTarget(init, event);
const gateway = INIT_GATEWAY_REGISTRY.get(target as Linkable) as StateGateway;
if (type === ObjectMutations.SET) {
if (typeof prev === 'undefined') {
gateway.remover(target, key, target);
} else {
gateway.setter(target, key, prev, target);
}
// target[key as never] = prev as never;
} else if (type === MapMutations.SET) {
if (typeof prev === 'undefined') {
// target.delete(key);
(gateway.mutator as MapMutator<unknown, unknown>).delete(key);
} else {
// target.set(key, prev);
(gateway.mutator as MapMutator<unknown, unknown>).set(key, prev);
}
} else if (type === SetMutations.ADD) {
(gateway.mutator as SetMutator<unknown>).delete(event.value);
// (target[key as never] as Set<unknown>).delete(event.value);
} else if (type === ObjectMutations.DELETE) {
// (target as ObjLike)[key] = prev;
gateway?.setter(target, key, prev, target);
} else if (type === MapMutations.DELETE || type === SetMutations.DELETE) {
if (target instanceof Map) {
// target.set(key, prev);
(gateway.mutator as MapMutator<unknown, unknown>).set(key, prev);
} else if (target instanceof Set) {
// (target[key as never] as Set<unknown>).add(prev);
(gateway.mutator as SetMutator<unknown>).add(prev);
}
} else if (type === BatchMutations.ASSIGN) {
// assign(target as never, prev as never);
assign(anchor.find(target) as never, prev as never);
} else if (type === MapMutations.CLEAR || type === SetMutations.CLEAR) {
if (target instanceof Map) {
for (const [key, value] of prev as [[unknown, unknown]]) {
// target.set(key as never, value);
(gateway.mutator as MapMutator<unknown, unknown>).set(key, value);
}
} else if (target instanceof Set) {
for (const value of prev as [unknown]) {
// target.add(value);
(gateway.mutator as SetMutator<unknown>).add(value);
}
}
} else if (ARRAY_MUTATIONS.includes(type as never)) {
const items = target as unknown[];
if (type === 'shift') {
// items.unshift(prev);
(gateway.mutator as ArrayMutator<unknown>).unshift(prev);
} else if (type === 'pop') {
// items.push(prev);
(gateway.mutator as ArrayMutator<unknown>).push(prev);
} else if (type === 'push') {
const initItems = (anchor.get as (item: unknown, silent: boolean) => unknown[])(items, true);
for (const item of event.value as unknown[]) {
const index = initItems.indexOf(item);
if (index >= 0) {
// items.splice(index, 1);
(gateway.mutator as ArrayMutator<unknown>).splice(index, 1);
}
}
} else if (type === 'unshift') {
// items.shift();
(gateway.mutator as ArrayMutator<unknown>).shift();
} else {
// items.splice(0, items.length, ...(prev as unknown[]));
(gateway.mutator as ArrayMutator<unknown>).splice(0, items.length, ...(prev as unknown[]));
}
}
}
/**
* Retrieves the target object and key for a nested property access.
*
* This function is used internally by the history management system to
* locate the specific object and property that was modified. It takes
* a state object and a path of keys, then traverses the object hierarchy
* to find the parent object and the final key.
*
* @template T - The type of the state object
* @param state - The root state object to traverse
* @param event - The state change event containing information about the modified property
* @returns An object containing the final key and its parent target object
*
* @internal
*/
export function getEventTarget<T>(state: T, event: StateChange) {
if (!event.keys.length) {
return { key: '', target: state as Linkable };
}
const parentKeys = [...event.keys];
const key = parentKeys.pop() as KeyLike;
if (!parentKeys.length) {
if (
(ARRAY_MUTATION_KEYS.has(event.type as ArrayMutations) ||
COLLECTION_MUTATION_KEYS.has(event.type as SetMutations)) &&
event.type !== MapMutations.SET &&
event.type !== MapMutations.DELETE
) {
return { key: '', target: getValue(state, key) as Linkable };
}
return { key, target: state as Linkable };
}
const target = parentKeys.reduce((parent, key) => {
return getValue(parent, key) as T;
}, state) as Linkable;
return { key, target };
}
/**
* Retrieves a value from a target object using a specified key.
*
* This function is used internally by the history management system to
* access values in various data structures including Maps and plain objects.
* It provides a unified interface for value retrieval regardless of the
* underlying data structure.
*
* @template T - The type of the target object
* @param target - The target object from which to retrieve the value
* @param key - The key used to access the value
* @returns The value associated with the key, or undefined if not found
*
* @internal
*/
function getValue<T>(target: T, key: KeyLike) {
if (target instanceof Map) {
return target.get(key);
}
return (target as Record<KeyLike, unknown>)[key];
}
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