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import { DEV } from 'esm-env';
import {
component_context,
active_reaction,
new_deps,
active_effect,
untracked_writes,
get,
is_runes,
schedule_effect,
set_untracked_writes,
set_signal_status,
untrack,
increment_version,
update_effect,
derived_sources,
set_derived_sources,
check_dirtiness,
set_is_flushing_effect,
is_flushing_effect
} from '../runtime.js';
import { equals, safe_equals } from './equality.js';
import {
CLEAN,
DERIVED,
DIRTY,
BRANCH_EFFECT,
INSPECT_EFFECT,
UNOWNED,
MAYBE_DIRTY,
BLOCK_EFFECT
} from '../constants.js';
import * as e from '../errors.js';
export let inspect_effects = new Set();
/**
* @param {Set<any>} v
*/
export function set_inspect_effects(v) {
inspect_effects = v;
}
/**
* @template V
* @param {V} v
* @returns {Source<V>}
*/
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} v
*/
export function state(v) {
return push_derived_source(source(v));
}
/**
* @template V
* @param {V} initial_value
* @param {boolean} [immutable]
* @returns {Source<V>}
*/
/*#__NO_SIDE_EFFECTS__*/
export function mutable_source(initial_value, immutable = false) {
const s = source(initial_value);
if (!immutable) {
s.equals = safe_equals;
}
// bind the signal to the component context, in case we need to
// track updates to trigger beforeUpdate/afterUpdate callbacks
if (component_context !== null && component_context.l !== null) {
(component_context.l.s ??= []).push(s);
}
return s;
}
/**
* @template V
* @param {V} v
* @param {boolean} [immutable]
* @returns {Source<V>}
*/
export function mutable_state(v, immutable = false) {
return push_derived_source(mutable_source(v, immutable));
}
/**
* @template V
* @param {Source<V>} source
*/
/*#__NO_SIDE_EFFECTS__*/
function push_derived_source(source) {
if (active_reaction !== null && (active_reaction.f & DERIVED) !== 0) {
if (derived_sources === null) {
set_derived_sources([source]);
} else {
derived_sources.push(source);
}
}
return source;
}
/**
* @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 (
active_reaction !== null &&
is_runes() &&
(active_reaction.f & (DERIVED | BLOCK_EFFECT)) !== 0 &&
// If the source was created locally within the current derived, then
// we allow the mutation.
(derived_sources === null || !derived_sources.includes(source))
) {
e.state_unsafe_mutation();
}
return internal_set(source, value);
}
/**
* @template V
* @param {Source<V>} source
* @param {V} value
* @returns {V}
*/
export function internal_set(source, value) {
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() &&
active_effect !== null &&
(active_effect.f & CLEAN) !== 0 &&
(active_effect.f & BRANCH_EFFECT) === 0
) {
if (new_deps !== null && new_deps.includes(source)) {
set_signal_status(active_effect, DIRTY);
schedule_effect(active_effect);
} else {
if (untracked_writes === null) {
set_untracked_writes([source]);
} else {
untracked_writes.push(source);
}
}
}
if (DEV && inspect_effects.size > 0) {
const inspects = Array.from(inspect_effects);
var previously_flushing_effect = is_flushing_effect;
set_is_flushing_effect(true);
try {
for (const effect of inspects) {
// Mark clean inspect-effects as maybe dirty and then check their dirtiness
// instead of just updating the effects - this way we avoid overfiring.
if ((effect.f & CLEAN) !== 0) {
set_signal_status(effect, MAYBE_DIRTY);
}
if (check_dirtiness(effect)) {
update_effect(effect);
}
}
} finally {
set_is_flushing_effect(previously_flushing_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 === active_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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