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

/**
 * A simple queue with optional priority.
 */
export class Queue {
  /**
   * Queue data.
   */
  _queue_ = [];

  /**
   * Queue constructor.
   */
  constructor() {}

  /**
   * 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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