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import { DEV } from 'esm-env';
import { get, current_component_context, untrack, current_effect } from './runtime.js';
import {
array_prototype,
define_property,
get_descriptor,
get_prototype_of,
is_array,
is_frozen,
object_prototype
} from '../shared/utils.js';
import { check_ownership, widen_ownership } from './dev/ownership.js';
import { source, set } from './reactivity/sources.js';
import { STATE_FROZEN_SYMBOL, STATE_SYMBOL } from './constants.js';
import { UNINITIALIZED } from '../../constants.js';
import * as e from './errors.js';
/**
* @template T
* @param {T} value
* @param {ProxyMetadata | null} [parent]
* @param {Source<T>} [prev] dev mode only
* @returns {ProxyStateObject<T> | T}
*/
export function proxy(value, parent = null, prev) {
if (
typeof value === 'object' &&
value != null &&
!is_frozen(value) &&
!(STATE_FROZEN_SYMBOL in value)
) {
// If we have an existing proxy, return it...
if (STATE_SYMBOL in value) {
const metadata = /** @type {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) {
// Since original parent relationship gets lost, we need to copy over ancestor owners
// into current metadata. The object might still exist on both, so we need to widen it.
widen_ownership(metadata, metadata);
metadata.parent = parent;
}
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 {ProxyMetadata} */ ({
s: new Map(),
v: source(0),
a: is_array(value),
p: proxy,
t: value
}),
writable: true,
enumerable: false
});
if (DEV) {
// @ts-expect-error
value[STATE_SYMBOL].parent = parent;
if (prev) {
// Reuse owners from previous state; necessary because reassignment is not guaranteed to have correct component context.
// If no previous proxy exists we play it safe and assume ownerless state
// @ts-expect-error
const prev_owners = prev?.v?.[STATE_SYMBOL]?.owners;
// @ts-expect-error
value[STATE_SYMBOL].owners = prev_owners ? new Set(prev_owners) : null;
} else {
// @ts-expect-error
value[STATE_SYMBOL].owners =
parent === null
? current_component_context !== null
? new Set([current_component_context.function])
: null
: new Set();
}
}
return proxy;
}
}
return value;
}
/**
* @param {Source<number>} signal
* @param {1 | -1} [d]
*/
function update_version(signal, d = 1) {
set(signal, signal.v + d);
}
/** @type {ProxyHandler<ProxyStateObject<any>>} */
const state_proxy_handler = {
defineProperty(target, prop, descriptor) {
if (descriptor.value) {
/** @type {ProxyMetadata} */
const metadata = target[STATE_SYMBOL];
const s = metadata.s.get(prop);
if (s !== undefined) set(s, proxy(descriptor.value, metadata));
}
return Reflect.defineProperty(target, prop, descriptor);
},
deleteProperty(target, prop) {
/** @type {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 {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 = source(proxy(target[prop], metadata));
metadata.s.set(prop, s);
}
if (s !== undefined) {
const value = get(s);
return value === UNINITIALIZED ? undefined : value;
}
return Reflect.get(target, prop, receiver);
},
getOwnPropertyDescriptor(target, prop) {
const descriptor = Reflect.getOwnPropertyDescriptor(target, prop);
if (descriptor && 'value' in descriptor) {
/** @type {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 {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 = source(has ? proxy(target[prop], metadata) : UNINITIALIZED);
metadata.s.set(prop, s);
}
const value = get(s);
if (value === UNINITIALIZED) {
return false;
}
}
return has;
},
set(target, prop, value, receiver) {
/** @type {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));
}
const is_array = metadata.a;
const not_has = !(prop in target);
if (DEV) {
/** @type {ProxyMetadata | undefined} */
const prop_metadata = value?.[STATE_SYMBOL];
if (prop_metadata && prop_metadata?.parent !== metadata) {
widen_ownership(metadata, prop_metadata);
}
check_ownership(metadata);
}
// 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);
}
}
var descriptor = Reflect.getOwnPropertyDescriptor(target, prop);
// Set the new value before updating any signals so that any listeners get the new value
if (descriptor?.set) {
descriptor.set.call(receiver, value);
} else {
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 {ProxyMetadata} */
const metadata = target[STATE_SYMBOL];
get(metadata.v);
return Reflect.ownKeys(target);
}
};
if (DEV) {
state_proxy_handler.setPrototypeOf = () => {
e.state_prototype_fixed();
};
}
/**
* @param {any} value
*/
export function get_proxied_value(value) {
if (value !== null && typeof value === 'object' && STATE_SYMBOL in value) {
var metadata = value[STATE_SYMBOL];
if (metadata) {
return metadata.p;
}
}
return value;
}
/**
* @param {any} a
* @param {any} b
*/
export function is(a, b) {
return Object.is(get_proxied_value(a), get_proxied_value(b));
}
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