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

this["wp"] = this["wp"] || {}; this["wp"]["priorityQueue"] =
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/***/ 351:
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
__webpack_require__.r(__webpack_exports__);
/* harmony export (binding) */ __webpack_require__.d(__webpack_exports__, "createQueue", function() { return createQueue; });
/**
 * 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
 */

/**
 * Priority queue instance.
 *
 * @typedef {Object} WPPriorityQueue
 *
 * @property {WPPriorityQueueAdd}   add   Add callback to queue for context.
 * @property {WPPriorityQueueFlush} flush Flush queue for context.
 */

/** @type {typeof window.requestIdleCallback|typeof window.requestAnimationFrame} */
var requestIdleCallback = window.requestIdleCallback ? window.requestIdleCallback : window.requestAnimationFrame;
/**
 * 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` and `flush` methods.
 */

var createQueue = function createQueue() {
  /** @type {WPPriorityQueueContext[]} */
  var waitingList = [];
  /** @type {WeakMap<WPPriorityQueueContext,WPPriorityQueueCallback>} */

  var elementsMap = new WeakMap();
  var isRunning = false;
  /**
   * Callback to process as much queue as time permits.
   *
   * @type {IdleRequestCallback & FrameRequestCallback}
   *
   * @param {IdleDeadline|number} deadline Idle callback deadline object, or
   *                                       animation frame timestamp.
   */

  var runWaitingList = function runWaitingList(deadline) {
    var hasTimeRemaining = typeof deadline === 'number' ? function () {
      return false;
    } : function () {
      return deadline.timeRemaining() > 0;
    };

    do {
      if (waitingList.length === 0) {
        isRunning = false;
        return;
      }

      var nextElement =
      /** @type {WPPriorityQueueContext} */
      waitingList.shift();
      var callback =
      /** @type {WPPriorityQueueCallback} */
      elementsMap.get(nextElement);
      callback();
      elementsMap.delete(nextElement);
    } while (hasTimeRemaining());

    requestIdleCallback(runWaitingList);
  };
  /**
   * Add a callback to the queue for a given context.
   *
   * @type {WPPriorityQueueAdd}
   *
   * @param {WPPriorityQueueContext}  element Context object.
   * @param {WPPriorityQueueCallback} item    Callback function.
   */


  var add = function add(element, item) {
    if (!elementsMap.has(element)) {
      waitingList.push(element);
    }

    elementsMap.set(element, item);

    if (!isRunning) {
      isRunning = true;
      requestIdleCallback(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.
   */


  var flush = function flush(element) {
    if (!elementsMap.has(element)) {
      return false;
    }

    elementsMap.delete(element);
    var index = waitingList.indexOf(element);
    waitingList.splice(index, 1);
    return true;
  };

  return {
    add: add,
    flush: flush
  };
};


/***/ })

/******/ });