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import {
get,
batch_inspect,
current_component_context,
untrack,
current_effect
} from './runtime.js';
import {
array_prototype,
define_property,
get_descriptor,
get_descriptors,
get_prototype_of,
is_array,
is_frozen,
object_prototype
} from './utils.js';
import { add_owner, check_ownership, strip_owner } from './dev/ownership.js';
import { mutable_source, source, set } from './reactivity/sources.js';
import { STATE_SYMBOL } from './constants.js';
import { UNINITIALIZED } from '../../constants.js';
/**
* @template T
* @param {T} value
* @param {boolean} [immutable]
* @param {Set<Function> | null} [owners]
* @returns {import('#client').ProxyStateObject<T> | T}
*/
export function proxy(value, immutable = true, owners) {
if (typeof value === 'object' && value != null && !is_frozen(value)) {
// If we have an existing proxy, return it...
if (STATE_SYMBOL in value) {
const metadata = /** @type {import('#client').ProxyMetadata<T>} */ (value[STATE_SYMBOL]);
// ...unless the proxy belonged to a different object, because
// someone copied the state symbol using `Reflect.ownKeys(...)`
if (metadata.t === value || metadata.p === value) {
if (DEV) {
// update ownership
if (owners) {
for (const owner of owners) {
add_owner(value, owner);
}
} else {
strip_owner(value);
}
}
return metadata.p;
}
}
const prototype = get_prototype_of(value);
if (prototype === object_prototype || prototype === array_prototype) {
const proxy = new Proxy(value, state_proxy_handler);
define_property(value, STATE_SYMBOL, {
value: /** @type {import('#client').ProxyMetadata} */ ({
s: new Map(),
v: source(0),
a: is_array(value),
i: immutable,
p: proxy,
t: value
}),
writable: true,
enumerable: false
});
if (DEV) {
// set ownership — either of the parent proxy's owners (if provided) or,
// when calling `$.proxy(...)`, to the current component if such there be
// @ts-expect-error
value[STATE_SYMBOL].o =
owners === undefined
? current_component_context
? // @ts-expect-error
new Set([current_component_context.function])
: null
: owners && new Set(owners);
}
return proxy;
}
}
return value;
}
/**
* @template {import('#client').ProxyStateObject} T
* @param {T} value
* @param {Map<T, Record<string | symbol, any>>} already_unwrapped
* @returns {Record<string | symbol, any>}
*/
function unwrap(value, already_unwrapped) {
if (typeof value === 'object' && value != null && STATE_SYMBOL in value) {
const unwrapped = already_unwrapped.get(value);
if (unwrapped !== undefined) {
return unwrapped;
}
if (is_array(value)) {
/** @type {Record<string | symbol, any>} */
const array = [];
already_unwrapped.set(value, array);
for (const element of value) {
array.push(unwrap(element, already_unwrapped));
}
return array;
} else {
/** @type {Record<string | symbol, any>} */
const obj = {};
const keys = Reflect.ownKeys(value);
const descriptors = get_descriptors(value);
already_unwrapped.set(value, obj);
for (const key of keys) {
if (key === STATE_SYMBOL) continue;
if (descriptors[key].get) {
define_property(obj, key, descriptors[key]);
} else {
/** @type {T} */
const property = value[key];
obj[key] = unwrap(property, already_unwrapped);
}
}
return obj;
}
}
return value;
}
/**
* @template T
* @param {T} value
* @returns {T}
*/
export function snapshot(value) {
return /** @type {T} */ (
unwrap(/** @type {import('#client').ProxyStateObject} */ (value), new Map())
);
}
/**
* @param {import('#client').Source<number>} signal
* @param {1 | -1} [d]
*/
function update_version(signal, d = 1) {
set(signal, signal.v + d);
}
/** @type {ProxyHandler<import('#client').ProxyStateObject<any>>} */
const state_proxy_handler = {
defineProperty(target, prop, descriptor) {
if (descriptor.value) {
/** @type {import('#client').ProxyMetadata} */
const metadata = target[STATE_SYMBOL];
const s = metadata.s.get(prop);
if (s !== undefined) set(s, proxy(descriptor.value, metadata.i, metadata.o));
}
return Reflect.defineProperty(target, prop, descriptor);
},
deleteProperty(target, prop) {
/** @type {import('#client').ProxyMetadata} */
const metadata = target[STATE_SYMBOL];
const s = metadata.s.get(prop);
const is_array = metadata.a;
const boolean = delete target[prop];
// If we have mutated an array directly, and the deletion
// was successful we will also need to update the length
// before updating the field or the version. This is to
// ensure any effects observing length can execute before
// effects that listen to the fields – otherwise they will
// operate an an index that no longer exists.
if (is_array && boolean) {
const ls = metadata.s.get('length');
const length = target.length - 1;
if (ls !== undefined && ls.v !== length) {
set(ls, length);
}
}
if (s !== undefined) set(s, UNINITIALIZED);
if (boolean) {
update_version(metadata.v);
}
return boolean;
},
get(target, prop, receiver) {
if (prop === STATE_SYMBOL) {
return Reflect.get(target, STATE_SYMBOL);
}
/** @type {import('#client').ProxyMetadata} */
const metadata = target[STATE_SYMBOL];
let s = metadata.s.get(prop);
// create a source, but only if it's an own property and not a prototype property
if (s === undefined && (!(prop in target) || get_descriptor(target, prop)?.writable)) {
s = (metadata.i ? source : mutable_source)(proxy(target[prop], metadata.i, metadata.o));
metadata.s.set(prop, s);
}
if (s !== undefined) {
const value = get(s);
return value === UNINITIALIZED ? undefined : value;
}
if (DEV) {
if (typeof target[prop] === 'function' && prop !== Symbol.iterator) {
return batch_inspect(target, prop, receiver);
}
}
return Reflect.get(target, prop, receiver);
},
getOwnPropertyDescriptor(target, prop) {
const descriptor = Reflect.getOwnPropertyDescriptor(target, prop);
if (descriptor && 'value' in descriptor) {
/** @type {import('#client').ProxyMetadata} */
const metadata = target[STATE_SYMBOL];
const s = metadata.s.get(prop);
if (s) {
descriptor.value = get(s);
}
}
return descriptor;
},
has(target, prop) {
if (prop === STATE_SYMBOL) {
return true;
}
/** @type {import('#client').ProxyMetadata} */
const metadata = target[STATE_SYMBOL];
const has = Reflect.has(target, prop);
let s = metadata.s.get(prop);
if (
s !== undefined ||
(current_effect !== null && (!has || get_descriptor(target, prop)?.writable))
) {
if (s === undefined) {
s = (metadata.i ? source : mutable_source)(
has ? proxy(target[prop], metadata.i, metadata.o) : UNINITIALIZED
);
metadata.s.set(prop, s);
}
const value = get(s);
if (value === UNINITIALIZED) {
return false;
}
}
return has;
},
set(target, prop, value, receiver) {
/** @type {import('#client').ProxyMetadata} */
const metadata = target[STATE_SYMBOL];
let s = metadata.s.get(prop);
// If we haven't yet created a source for this property, we need to ensure
// we do so otherwise if we read it later, then the write won't be tracked and
// the heuristics of effects will be different vs if we had read the proxied
// object property before writing to that property.
if (s === undefined) {
// the read creates a signal
untrack(() => receiver[prop]);
s = metadata.s.get(prop);
}
if (s !== undefined) {
set(s, proxy(value, metadata.i, metadata.o));
}
const is_array = metadata.a;
const not_has = !(prop in target);
if (DEV) {
// First check ownership of the object that is assigned to.
// Then, if the new object has owners, widen them with the ones from the current object.
// If it doesn't have owners that means it's ownerless, and so the assigned object should be, too.
if (metadata.o) {
check_ownership(metadata.o);
for (const owner in metadata.o) {
add_owner(value, owner);
}
} else {
strip_owner(value);
}
}
// variable.length = value -> clear all signals with index >= value
if (is_array && prop === 'length') {
for (let i = value; i < target.length; i += 1) {
const s = metadata.s.get(i + '');
if (s !== undefined) set(s, UNINITIALIZED);
}
}
// Set the new value before updating any signals so that any listeners get the new value
// @ts-ignore
target[prop] = value;
if (not_has) {
// If we have mutated an array directly, we might need to
// signal that length has also changed. Do it before updating metadata
// to ensure that iterating over the array as a result of a metadata update
// will not cause the length to be out of sync.
if (is_array) {
const ls = metadata.s.get('length');
const length = target.length;
if (ls !== undefined && ls.v !== length) {
set(ls, length);
}
}
update_version(metadata.v);
}
return true;
},
ownKeys(target) {
/** @type {import('#client').ProxyMetadata} */
const metadata = target[STATE_SYMBOL];
get(metadata.v);
return Reflect.ownKeys(target);
}
};
if (DEV) {
state_proxy_handler.setPrototypeOf = () => {
throw new Error('Cannot set prototype of $state object');
};
}
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