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

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/***/ 5033:
/***/ ((module, exports, __webpack_require__) => {

var __WEBPACK_AMD_DEFINE_FACTORY__, __WEBPACK_AMD_DEFINE_ARRAY__, __WEBPACK_AMD_DEFINE_RESULT__;(function (factory) {
	if (true) {
		!(__WEBPACK_AMD_DEFINE_ARRAY__ = [], __WEBPACK_AMD_DEFINE_FACTORY__ = (factory),
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		(__WEBPACK_AMD_DEFINE_FACTORY__.apply(exports, __WEBPACK_AMD_DEFINE_ARRAY__)) : __WEBPACK_AMD_DEFINE_FACTORY__),
		__WEBPACK_AMD_DEFINE_RESULT__ !== undefined && (module.exports = __WEBPACK_AMD_DEFINE_RESULT__));
	} else {}
}(function(){
	'use strict';
	var scheduleStart, throttleDelay, lazytimer, lazyraf;
	var root = typeof window != 'undefined' ?
		window :
		typeof __webpack_require__.g != undefined ?
			__webpack_require__.g :
			this || {};
	var requestAnimationFrame = root.cancelRequestAnimationFrame && root.requestAnimationFrame || setTimeout;
	var cancelRequestAnimationFrame = root.cancelRequestAnimationFrame || clearTimeout;
	var tasks = [];
	var runAttempts = 0;
	var isRunning = false;
	var remainingTime = 7;
	var minThrottle = 35;
	var throttle = 125;
	var index = 0;
	var taskStart = 0;
	var tasklength = 0;
	var IdleDeadline = {
		get didTimeout(){
			return false;
		},
		timeRemaining: function(){
			var timeRemaining = remainingTime - (Date.now() - taskStart);
			return timeRemaining < 0 ? 0 : timeRemaining;
		},
	};
	var setInactive = debounce(function(){
		remainingTime = 22;
		throttle = 66;
		minThrottle = 0;
	});

	function debounce(fn){
		var id, timestamp;
		var wait = 99;
		var check = function(){
			var last = (Date.now()) - timestamp;

			if (last < wait) {
				id = setTimeout(check, wait - last);
			} else {
				id = null;
				fn();
			}
		};
		return function(){
			timestamp = Date.now();
			if(!id){
				id = setTimeout(check, wait);
			}
		};
	}

	function abortRunning(){
		if(isRunning){
			if(lazyraf){
				cancelRequestAnimationFrame(lazyraf);
			}
			if(lazytimer){
				clearTimeout(lazytimer);
			}
			isRunning = false;
		}
	}

	function onInputorMutation(){
		if(throttle != 125){
			remainingTime = 7;
			throttle = 125;
			minThrottle = 35;

			if(isRunning) {
				abortRunning();
				scheduleLazy();
			}
		}
		setInactive();
	}

	function scheduleAfterRaf() {
		lazyraf = null;
		lazytimer = setTimeout(runTasks, 0);
	}

	function scheduleRaf(){
		lazytimer = null;
		requestAnimationFrame(scheduleAfterRaf);
	}

	function scheduleLazy(){

		if(isRunning){return;}
		throttleDelay = throttle - (Date.now() - taskStart);

		scheduleStart = Date.now();

		isRunning = true;

		if(minThrottle && throttleDelay < minThrottle){
			throttleDelay = minThrottle;
		}

		if(throttleDelay > 9){
			lazytimer = setTimeout(scheduleRaf, throttleDelay);
		} else {
			throttleDelay = 0;
			scheduleRaf();
		}
	}

	function runTasks(){
		var task, i, len;
		var timeThreshold = remainingTime > 9 ?
			9 :
			1
		;

		taskStart = Date.now();
		isRunning = false;

		lazytimer = null;

		if(runAttempts > 2 || taskStart - throttleDelay - 50 < scheduleStart){
			for(i = 0, len = tasks.length; i < len && IdleDeadline.timeRemaining() > timeThreshold; i++){
				task = tasks.shift();
				tasklength++;
				if(task){
					task(IdleDeadline);
				}
			}
		}

		if(tasks.length){
			scheduleLazy();
		} else {
			runAttempts = 0;
		}
	}

	function requestIdleCallbackShim(task){
		index++;
		tasks.push(task);
		scheduleLazy();
		return index;
	}

	function cancelIdleCallbackShim(id){
		var index = id - 1 - tasklength;
		if(tasks[index]){
			tasks[index] = null;
		}
	}

	if(!root.requestIdleCallback || !root.cancelIdleCallback){
		root.requestIdleCallback = requestIdleCallbackShim;
		root.cancelIdleCallback = cancelIdleCallbackShim;

		if(root.document && document.addEventListener){
			root.addEventListener('scroll', onInputorMutation, true);
			root.addEventListener('resize', onInputorMutation);

			document.addEventListener('focus', onInputorMutation, true);
			document.addEventListener('mouseover', onInputorMutation, true);
			['click', 'keypress', 'touchstart', 'mousedown'].forEach(function(name){
				document.addEventListener(name, onInputorMutation, {capture: true, passive: true});
			});

			if(root.MutationObserver){
				new MutationObserver( onInputorMutation ).observe( document.documentElement, {childList: true, subtree: true, attributes: true} );
			}
		}
	} else {
		try{
			root.requestIdleCallback(function(){}, {timeout: 0});
		} catch(e){
			(function(rIC){
				var timeRemainingProto, timeRemaining;
				root.requestIdleCallback = function(fn, timeout){
					if(timeout && typeof timeout.timeout == 'number'){
						return rIC(fn, timeout.timeout);
					}
					return rIC(fn);
				};
				if(root.IdleCallbackDeadline && (timeRemainingProto = IdleCallbackDeadline.prototype)){
					timeRemaining = Object.getOwnPropertyDescriptor(timeRemainingProto, 'timeRemaining');
					if(!timeRemaining || !timeRemaining.configurable || !timeRemaining.get){return;}
					Object.defineProperty(timeRemainingProto, 'timeRemaining', {
						value:  function(){
							return timeRemaining.get.call(this);
						},
						enumerable: true,
						configurable: true,
					});
				}
			})(root.requestIdleCallback)
		}
	}

	return {
		request: requestIdleCallbackShim,
		cancel: cancelIdleCallbackShim,
	};
}));


/***/ })

/******/ 	});
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/************************************************************************/
var __webpack_exports__ = {};
// This entry needs to be wrapped in an IIFE because it needs to be in strict mode.
(() => {
"use strict";
// ESM COMPAT FLAG
__webpack_require__.r(__webpack_exports__);

// EXPORTS
__webpack_require__.d(__webpack_exports__, {
  createQueue: () => (/* binding */ createQueue)
});

// EXTERNAL MODULE: ./node_modules/requestidlecallback/index.js
var requestidlecallback = __webpack_require__(5033);
;// ./node_modules/@wordpress/priority-queue/build-module/request-idle-callback.js
/**
 * External dependencies
 */


/**
 * @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;
}
/* harmony default export */ const request_idle_callback = (createRequestIdleCallback());

;// ./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 {WPPriorityQueueFlush} cancel Clear 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 {Map<WPPriorityQueueContext, WPPriorityQueueCallback>} */
  const waitingList = new Map();
  let isRunning = false;

  /**
   * Callback to process as much queue as time permits.
   *
   * Map Iteration follows the original insertion order. This means that here
   * we can iterate the queue and know that the first contexts which were
   * added will be run first. On the other hand, if anyone adds a new callback
   * for an existing context it will supplant the previously-set callback for
   * that context because we reassigned that map key's value.
   *
   * In the case that a callback adds a new callback to its own context then
   * the callback it adds will appear at the end of the iteration and will be
   * run only after all other existing contexts have finished executing.
   *
   * @param {IdleDeadline|number} deadline Idle callback deadline object, or
   *                                       animation frame timestamp.
   */
  const runWaitingList = deadline => {
    for (const [nextElement, callback] of waitingList) {
      waitingList.delete(nextElement);
      callback();
      if ('number' === typeof deadline || deadline.timeRemaining() <= 0) {
        break;
      }
    }
    if (waitingList.size === 0) {
      isRunning = false;
      return;
    }
    request_idle_callback(runWaitingList);
  };

  /**
   * Add a callback to the queue for a given context.
   *
   * If errors with undefined callbacks are encountered double check that
   * all of your useSelect calls have the right dependencies set correctly
   * in their second parameter. Missing dependencies can cause unexpected
   * loops and race conditions in the queue.
   *
   * @type {WPPriorityQueueAdd}
   *
   * @param {WPPriorityQueueContext}  element Context object.
   * @param {WPPriorityQueueCallback} item    Callback function.
   */
  const add = (element, item) => {
    waitingList.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 => {
    const callback = waitingList.get(element);
    if (undefined === callback) {
      return false;
    }
    waitingList.delete(element);
    callback();
    return true;
  };

  /**
   * Clears the queue for a given context, cancelling the callbacks without
   * executing them. Returns `true` if there were scheduled callbacks to cancel,
   * or `false` if there was is no queue for the given context.
   *
   * @type {WPPriorityQueueFlush}
   *
   * @param {WPPriorityQueueContext} element Context object.
   *
   * @return {boolean} Whether any callbacks got cancelled.
   */
  const cancel = element => {
    return waitingList.delete(element);
  };

  /**
   * Reset the queue without running the pending callbacks.
   *
   * @type {WPPriorityQueueReset}
   */
  const reset = () => {
    waitingList.clear();
    isRunning = false;
  };
  return {
    add,
    flush,
    cancel,
    reset
  };
};

})();

(window.wp = window.wp || {}).priorityQueue = __webpack_exports__;
/******/ })()
;