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import { run_all } from './utils.js';
import { current_component, set_current_component } from './lifecycle.js';
export const dirty_components = [];
export const intros = { enabled: false };
export const binding_callbacks = [];
let render_callbacks = [];
const flush_callbacks = [];
const resolved_promise = /* @__PURE__ */ Promise.resolve();
let update_scheduled = false;
/** @returns {void} */
export function schedule_update() {
if (!update_scheduled) {
update_scheduled = true;
resolved_promise.then(flush);
}
}
/** @returns {Promise<void>} */
export function tick() {
schedule_update();
return resolved_promise;
}
/** @returns {void} */
export function add_render_callback(fn) {
render_callbacks.push(fn);
}
/** @returns {void} */
export function add_flush_callback(fn) {
flush_callbacks.push(fn);
}
// flush() calls callbacks in this order:
// 1. All beforeUpdate callbacks, in order: parents before children
// 2. All bind:this callbacks, in reverse order: children before parents.
// 3. All afterUpdate callbacks, in order: parents before children. EXCEPT
// for afterUpdates called during the initial onMount, which are called in
// reverse order: children before parents.
// Since callbacks might update component values, which could trigger another
// call to flush(), the following steps guard against this:
// 1. During beforeUpdate, any updated components will be added to the
// dirty_components array and will cause a reentrant call to flush(). Because
// the flush index is kept outside the function, the reentrant call will pick
// up where the earlier call left off and go through all dirty components. The
// current_component value is saved and restored so that the reentrant call will
// not interfere with the "parent" flush() call.
// 2. bind:this callbacks cannot trigger new flush() calls.
// 3. During afterUpdate, any updated components will NOT have their afterUpdate
// callback called a second time; the seen_callbacks set, outside the flush()
// function, guarantees this behavior.
const seen_callbacks = new Set();
let flushidx = 0; // Do *not* move this inside the flush() function
/** @returns {void} */
export function flush() {
// Do not reenter flush while dirty components are updated, as this can
// result in an infinite loop. Instead, let the inner flush handle it.
// Reentrancy is ok afterwards for bindings etc.
if (flushidx !== 0) {
return;
}
const saved_component = current_component;
do {
// first, call beforeUpdate functions
// and update components
try {
while (flushidx < dirty_components.length) {
const component = dirty_components[flushidx];
flushidx++;
set_current_component(component);
update(component.$$);
}
} catch (e) {
// reset dirty state to not end up in a deadlocked state and then rethrow
dirty_components.length = 0;
flushidx = 0;
throw e;
}
set_current_component(null);
dirty_components.length = 0;
flushidx = 0;
while (binding_callbacks.length) binding_callbacks.pop()();
// then, once components are updated, call
// afterUpdate functions. This may cause
// subsequent updates...
for (let i = 0; i < render_callbacks.length; i += 1) {
const callback = render_callbacks[i];
if (!seen_callbacks.has(callback)) {
// ...so guard against infinite loops
seen_callbacks.add(callback);
callback();
}
}
render_callbacks.length = 0;
} while (dirty_components.length);
while (flush_callbacks.length) {
flush_callbacks.pop()();
}
update_scheduled = false;
seen_callbacks.clear();
set_current_component(saved_component);
}
/** @returns {void} */
function update($$) {
if ($$.fragment !== null) {
$$.update();
run_all($$.before_update);
const dirty = $$.dirty;
$$.dirty = [-1];
$$.fragment && $$.fragment.p($$.ctx, dirty);
$$.after_update.forEach(add_render_callback);
}
}
/**
* Useful for example to execute remaining `afterUpdate` callbacks before executing `destroy`.
* @param {Function[]} fns
* @returns {void}
*/
export function flush_render_callbacks(fns) {
const filtered = [];
const targets = [];
render_callbacks.forEach((c) => (fns.indexOf(c) === -1 ? filtered.push(c) : targets.push(c)));
targets.forEach((c) => c());
render_callbacks = filtered;
}
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