WordPress/wp-includes/js/dist/priority-queue.js

296 lines
8.7 KiB
JavaScript

this["wp"] = this["wp"] || {}; this["wp"]["priorityQueue"] =
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/***/ "XPKI":
/***/ (function(module, __webpack_exports__, __webpack_require__) {
"use strict";
// ESM COMPAT FLAG
__webpack_require__.r(__webpack_exports__);
// EXPORTS
__webpack_require__.d(__webpack_exports__, "createQueue", function() { return /* binding */ createQueue; });
// CONCATENATED MODULE: ./node_modules/@wordpress/priority-queue/build-module/request-idle-callback.js
/**
* @typedef {( timeOrDeadline: IdleDeadline | number ) => void} Callback
*/
/**
* @return {(callback: Callback) => void} RequestIdleCallback
*/
function createRequestIdleCallback() {
if (typeof window === 'undefined') {
return callback => {
setTimeout(() => callback(Date.now()), 0);
};
}
return window.requestIdleCallback || window.requestAnimationFrame;
}
/* harmony default export */ var request_idle_callback = (createRequestIdleCallback());
// CONCATENATED MODULE: ./node_modules/@wordpress/priority-queue/build-module/index.js
/**
* Internal dependencies
*/
/**
* Enqueued callback to invoke once idle time permits.
*
* @typedef {()=>void} WPPriorityQueueCallback
*/
/**
* An object used to associate callbacks in a particular context grouping.
*
* @typedef {{}} WPPriorityQueueContext
*/
/**
* Function to add callback to priority queue.
*
* @typedef {(element:WPPriorityQueueContext,item:WPPriorityQueueCallback)=>void} WPPriorityQueueAdd
*/
/**
* Function to flush callbacks from priority queue.
*
* @typedef {(element:WPPriorityQueueContext)=>boolean} WPPriorityQueueFlush
*/
/**
* Reset the queue.
*
* @typedef {()=>void} WPPriorityQueueReset
*/
/**
* Priority queue instance.
*
* @typedef {Object} WPPriorityQueue
*
* @property {WPPriorityQueueAdd} add Add callback to queue for context.
* @property {WPPriorityQueueFlush} flush Flush queue for context.
* @property {WPPriorityQueueReset} reset Reset queue.
*/
/**
* Creates a context-aware queue that only executes
* the last task of a given context.
*
* @example
*```js
* import { createQueue } from '@wordpress/priority-queue';
*
* const queue = createQueue();
*
* // Context objects.
* const ctx1 = {};
* const ctx2 = {};
*
* // For a given context in the queue, only the last callback is executed.
* queue.add( ctx1, () => console.log( 'This will be printed first' ) );
* queue.add( ctx2, () => console.log( 'This won\'t be printed' ) );
* queue.add( ctx2, () => console.log( 'This will be printed second' ) );
*```
*
* @return {WPPriorityQueue} Queue object with `add`, `flush` and `reset` methods.
*/
const createQueue = () => {
/** @type {WPPriorityQueueContext[]} */
let waitingList = [];
/** @type {WeakMap<WPPriorityQueueContext,WPPriorityQueueCallback>} */
let elementsMap = new WeakMap();
let isRunning = false;
/**
* Callback to process as much queue as time permits.
*
* @param {IdleDeadline|number} deadline Idle callback deadline object, or
* animation frame timestamp.
*/
const runWaitingList = deadline => {
const hasTimeRemaining = typeof deadline === 'number' ? () => false : () => deadline.timeRemaining() > 0;
do {
if (waitingList.length === 0) {
isRunning = false;
return;
}
const nextElement =
/** @type {WPPriorityQueueContext} */
waitingList.shift();
const callback =
/** @type {WPPriorityQueueCallback} */
elementsMap.get(nextElement); // If errors with undefined callbacks are encountered double check that all of your useSelect calls
// have all dependecies set correctly in second parameter. Missing dependencies can cause unexpected
// loops and race conditions in the queue.
callback();
elementsMap.delete(nextElement);
} while (hasTimeRemaining());
request_idle_callback(runWaitingList);
};
/**
* Add a callback to the queue for a given context.
*
* @type {WPPriorityQueueAdd}
*
* @param {WPPriorityQueueContext} element Context object.
* @param {WPPriorityQueueCallback} item Callback function.
*/
const add = (element, item) => {
if (!elementsMap.has(element)) {
waitingList.push(element);
}
elementsMap.set(element, item);
if (!isRunning) {
isRunning = true;
request_idle_callback(runWaitingList);
}
};
/**
* Flushes queue for a given context, returning true if the flush was
* performed, or false if there is no queue for the given context.
*
* @type {WPPriorityQueueFlush}
*
* @param {WPPriorityQueueContext} element Context object.
*
* @return {boolean} Whether flush was performed.
*/
const flush = element => {
if (!elementsMap.has(element)) {
return false;
}
const index = waitingList.indexOf(element);
waitingList.splice(index, 1);
const callback =
/** @type {WPPriorityQueueCallback} */
elementsMap.get(element);
elementsMap.delete(element);
callback();
return true;
};
/**
* Reset the queue without running the pending callbacks.
*
* @type {WPPriorityQueueReset}
*/
const reset = () => {
waitingList = [];
elementsMap = new WeakMap();
isRunning = false;
};
return {
add,
flush,
reset
};
};
/***/ })
/******/ });