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


Generated : Mon Aug 2 08:20:01 2021 Cross-referenced by PHPXref