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/wp-includes/js/dist/ -> priority-queue.js (source)

   1  this["wp"] = this["wp"] || {}; this["wp"]["priorityQueue"] =
   2  /******/ (function(modules) { // webpackBootstrap
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  84  /******/     // Load entry module and return exports
  85  /******/     return __webpack_require__(__webpack_require__.s = 486);
  86  /******/ })
  87  /************************************************************************/
  88  /******/ ({
  89  
  90  /***/ 486:
  91  /***/ (function(module, __webpack_exports__, __webpack_require__) {
  92  
  93  "use strict";
  94  // ESM COMPAT FLAG
  95  __webpack_require__.r(__webpack_exports__);
  96  
  97  // EXPORTS
  98  __webpack_require__.d(__webpack_exports__, "createQueue", function() { return /* binding */ build_module_createQueue; });
  99  
 100  // CONCATENATED MODULE: ./node_modules/@wordpress/priority-queue/build-module/request-idle-callback.js
 101  /**
 102   * @typedef {( timeOrDeadline: IdleDeadline | number ) => void} Callback
 103   */
 104  
 105  /**
 106   * @return {(callback: Callback) => void} RequestIdleCallback
 107   */
 108  function createRequestIdleCallback() {
 109    if (typeof window === 'undefined') {
 110      return function (callback) {
 111        setTimeout(function () {
 112          return callback(Date.now());
 113        }, 0);
 114      };
 115    }
 116  
 117    return window.requestIdleCallback || window.requestAnimationFrame;
 118  }
 119  /* harmony default export */ var request_idle_callback = (createRequestIdleCallback());
 120  
 121  // CONCATENATED MODULE: ./node_modules/@wordpress/priority-queue/build-module/index.js
 122  /**
 123   * Internal dependencies
 124   */
 125  
 126  /**
 127   * Enqueued callback to invoke once idle time permits.
 128   *
 129   * @typedef {()=>void} WPPriorityQueueCallback
 130   */
 131  
 132  /**
 133   * An object used to associate callbacks in a particular context grouping.
 134   *
 135   * @typedef {{}} WPPriorityQueueContext
 136   */
 137  
 138  /**
 139   * Function to add callback to priority queue.
 140   *
 141   * @typedef {(element:WPPriorityQueueContext,item:WPPriorityQueueCallback)=>void} WPPriorityQueueAdd
 142   */
 143  
 144  /**
 145   * Function to flush callbacks from priority queue.
 146   *
 147   * @typedef {(element:WPPriorityQueueContext)=>boolean} WPPriorityQueueFlush
 148   */
 149  
 150  /**
 151   * Reset the queue.
 152   *
 153   * @typedef {()=>void} WPPriorityQueueReset
 154   */
 155  
 156  /**
 157   * Priority queue instance.
 158   *
 159   * @typedef {Object} WPPriorityQueue
 160   *
 161   * @property {WPPriorityQueueAdd}   add   Add callback to queue for context.
 162   * @property {WPPriorityQueueFlush} flush Flush queue for context.
 163   * @property {WPPriorityQueueReset} reset Reset queue.
 164   */
 165  
 166  /**
 167   * Creates a context-aware queue that only executes
 168   * the last task of a given context.
 169   *
 170   * @example
 171   *```js
 172   * import { createQueue } from '@wordpress/priority-queue';
 173   *
 174   * const queue = createQueue();
 175   *
 176   * // Context objects.
 177   * const ctx1 = {};
 178   * const ctx2 = {};
 179   *
 180   * // For a given context in the queue, only the last callback is executed.
 181   * queue.add( ctx1, () => console.log( 'This will be printed first' ) );
 182   * queue.add( ctx2, () => console.log( 'This won\'t be printed' ) );
 183   * queue.add( ctx2, () => console.log( 'This will be printed second' ) );
 184   *```
 185   *
 186   * @return {WPPriorityQueue} Queue object with `add`, `flush` and `reset` methods.
 187   */
 188  
 189  var build_module_createQueue = function createQueue() {
 190    /** @type {WPPriorityQueueContext[]} */
 191    var waitingList = [];
 192    /** @type {WeakMap<WPPriorityQueueContext,WPPriorityQueueCallback>} */
 193  
 194    var elementsMap = new WeakMap();
 195    var isRunning = false;
 196    /**
 197     * Callback to process as much queue as time permits.
 198     *
 199     * @param {IdleDeadline|number} deadline Idle callback deadline object, or
 200     *                                       animation frame timestamp.
 201     */
 202  
 203    var runWaitingList = function runWaitingList(deadline) {
 204      var hasTimeRemaining = typeof deadline === 'number' ? function () {
 205        return false;
 206      } : function () {
 207        return deadline.timeRemaining() > 0;
 208      };
 209  
 210      do {
 211        if (waitingList.length === 0) {
 212          isRunning = false;
 213          return;
 214        }
 215  
 216        var nextElement =
 217        /** @type {WPPriorityQueueContext} */
 218        waitingList.shift();
 219        var callback =
 220        /** @type {WPPriorityQueueCallback} */
 221        elementsMap.get(nextElement);
 222        callback();
 223        elementsMap.delete(nextElement);
 224      } while (hasTimeRemaining());
 225  
 226      request_idle_callback(runWaitingList);
 227    };
 228    /**
 229     * Add a callback to the queue for a given context.
 230     *
 231     * @type {WPPriorityQueueAdd}
 232     *
 233     * @param {WPPriorityQueueContext}  element Context object.
 234     * @param {WPPriorityQueueCallback} item    Callback function.
 235     */
 236  
 237  
 238    var add = function add(element, item) {
 239      if (!elementsMap.has(element)) {
 240        waitingList.push(element);
 241      }
 242  
 243      elementsMap.set(element, item);
 244  
 245      if (!isRunning) {
 246        isRunning = true;
 247        request_idle_callback(runWaitingList);
 248      }
 249    };
 250    /**
 251     * Flushes queue for a given context, returning true if the flush was
 252     * performed, or false if there is no queue for the given context.
 253     *
 254     * @type {WPPriorityQueueFlush}
 255     *
 256     * @param {WPPriorityQueueContext} element Context object.
 257     *
 258     * @return {boolean} Whether flush was performed.
 259     */
 260  
 261  
 262    var flush = function flush(element) {
 263      if (!elementsMap.has(element)) {
 264        return false;
 265      }
 266  
 267      var index = waitingList.indexOf(element);
 268      waitingList.splice(index, 1);
 269      var callback =
 270      /** @type {WPPriorityQueueCallback} */
 271      elementsMap.get(element);
 272      elementsMap.delete(element);
 273      callback();
 274      return true;
 275    };
 276    /**
 277     * Reset the queue without running the pending callbacks.
 278     *
 279     * @type {WPPriorityQueueReset}
 280     */
 281  
 282  
 283    var reset = function reset() {
 284      waitingList = [];
 285      elementsMap = new WeakMap();
 286      isRunning = false;
 287    };
 288  
 289    return {
 290      add: add,
 291      flush: flush,
 292      reset: reset
 293    };
 294  };
 295  
 296  
 297  /***/ })
 298  
 299  /******/ });


Generated : Tue Nov 24 08:20:02 2020 Cross-referenced by PHPXref