@shockpkg/swf-projector/lib/queue.mjs

import _defineProperty from "@babel/runtime/helpers/defineProperty";

/**
 * A simple queue with optional priority.
 */
export class Queue extends Object {
  /**
   * Queue data.
   */
  constructor() {
    super();

    _defineProperty(this, "_queue_", []);
  }
  /**
   * Get size of queue.
   *
   * @returns Total callbacks in queue.
   */


  get size() {
    return this._queue_.length;
  }
  /**
   * Clear queue.
   */


  clear() {
    this._queue_ = [];
  }
  /**
   * Enqueue callback.
   *
   * @param handler Callback function.
   * @param priority Callback priority.
   */


  push(handler, priority = 0) {
    const queue = this._queue_;
    let index = 0;

    for (let i = queue.length; i--;) {
      if (queue[i].priority < priority) {
        index = i + 1;
        break;
      }
    }

    queue.splice(index, 0, {
      priority,
      handler
    });
  }
  /**
   * Pop callback off queue.
   *
   * @returns Callback function or null if empty.
   */


  pop() {
    const entry = this._queue_.pop();

    return entry ? entry.handler : null;
  }
  /**
   * Shift callback off queue.
   *
   * @returns Callback function or null if empty.
   */


  shift() {
    const entry = this._queue_.shift();

    return entry ? entry.handler : null;
  }
  /**
   * Run queue.
   */


  async run() {
    for (;;) {
      const entry = this.pop();

      if (!entry) {
        break;
      } // eslint-disable-next-line no-await-in-loop


      await entry();
    }
  }

}
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