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import { DEV } from 'esm-env';
import {
current_component_context,
current_reaction,
new_deps,
current_effect,
current_untracked_writes,
get,
is_runes,
schedule_effect,
set_current_untracked_writes,
set_signal_status,
untrack,
increment_version,
update_effect
} from '../runtime.js';
import { equals, safe_equals } from './equality.js';
import {
CLEAN,
DERIVED,
DIRTY,
BRANCH_EFFECT,
INSPECT_EFFECT,
UNOWNED,
MAYBE_DIRTY
} from '../constants.js';
import * as e from '../errors.js';
import { derived } from './deriveds.js';
let inspect_effects = new Set();
/**
* @template V
* @param {V} v
* @returns {Source<V>}
*/
/*#__NO_SIDE_EFFECTS__*/
export function source(v) {
return {
f: 0, // TODO ideally we could skip this altogether, but it causes type errors
v,
reactions: null,
equals,
version: 0
};
}
/**
* @template V
* @param {() => V} get_value
* @returns {(value?: V) => V}
*/
export function source_link(get_value) {
var was_local = false;
var local_source = source(/** @type {V} */ (undefined));
var linked_derived = derived(() => {
var local_value = /** @type {V} */ (get(local_source));
var linked_value = get_value();
if (was_local) {
was_local = false;
return local_value;
}
return linked_value;
});
return function (/** @type {any} */ value) {
if (arguments.length > 0) {
was_local = true;
set(local_source, value);
get(linked_derived);
return value;
}
return (local_source.v = get(linked_derived));
};
}
/**
* @template V
* @param {V} initial_value
* @returns {Source<V>}
*/
/*#__NO_SIDE_EFFECTS__*/
export function mutable_source(initial_value) {
const s = source(initial_value);
s.equals = safe_equals;
// bind the signal to the component context, in case we need to
// track updates to trigger beforeUpdate/afterUpdate callbacks
if (current_component_context !== null && current_component_context.l !== null) {
(current_component_context.l.s ??= []).push(s);
}
return s;
}
/**
* @template V
* @param {Value<V>} source
* @param {V} value
*/
export function mutate(source, value) {
set(
source,
untrack(() => get(source))
);
return value;
}
/**
* @template V
* @param {Source<V>} source
* @param {V} value
* @returns {V}
*/
export function set(source, value) {
if (current_reaction !== null && is_runes() && (current_reaction.f & DERIVED) !== 0) {
e.state_unsafe_mutation();
}
if (!source.equals(value)) {
source.v = value;
source.version = increment_version();
mark_reactions(source, DIRTY);
// If the current signal is running for the first time, it won't have any
// reactions as we only allocate and assign the reactions after the signal
// has fully executed. So in the case of ensuring it registers the reaction
// properly for itself, we need to ensure the current effect actually gets
// scheduled. i.e: `$effect(() => x++)`
if (
is_runes() &&
current_effect !== null &&
(current_effect.f & CLEAN) !== 0 &&
(current_effect.f & BRANCH_EFFECT) === 0
) {
if (new_deps !== null && new_deps.includes(source)) {
set_signal_status(current_effect, DIRTY);
schedule_effect(current_effect);
} else {
if (current_untracked_writes === null) {
set_current_untracked_writes([source]);
} else {
current_untracked_writes.push(source);
}
}
}
if (DEV) {
for (const effect of inspect_effects) {
update_effect(effect);
}
inspect_effects.clear();
}
}
return value;
}
/**
* @param {Value} signal
* @param {number} status should be DIRTY or MAYBE_DIRTY
* @returns {void}
*/
function mark_reactions(signal, status) {
var reactions = signal.reactions;
if (reactions === null) return;
var runes = is_runes();
var length = reactions.length;
for (var i = 0; i < length; i++) {
var reaction = reactions[i];
var flags = reaction.f;
// Skip any effects that are already dirty
if ((flags & DIRTY) !== 0) continue;
// In legacy mode, skip the current effect to prevent infinite loops
if (!runes && reaction === current_effect) continue;
// Inspect effects need to run immediately, so that the stack trace makes sense
if (DEV && (flags & INSPECT_EFFECT) !== 0) {
inspect_effects.add(reaction);
continue;
}
set_signal_status(reaction, status);
// If the signal a) was previously clean or b) is an unowned derived, then mark it
if ((flags & (CLEAN | UNOWNED)) !== 0) {
if ((flags & DERIVED) !== 0) {
mark_reactions(/** @type {Derived} */ (reaction), MAYBE_DIRTY);
} else {
schedule_effect(/** @type {Effect} */ (reaction));
}
}
}
}
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