晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : /home/stando/www/wp-content/plugins/w3-total-cache/lib/Azure/GuzzleHttp/Promise/Coroutine.php
<?php
namespace GuzzleHttp\Promise;

use Exception;
use Generator;
use Throwable;

/**
 * Creates a promise that is resolved using a generator that yields values or
 * promises (somewhat similar to C#'s async keyword).
 *
 * When called, the coroutine function will start an instance of the generator
 * and returns a promise that is fulfilled with its final yielded value.
 *
 * Control is returned back to the generator when the yielded promise settles.
 * This can lead to less verbose code when doing lots of sequential async calls
 * with minimal processing in between.
 *
 *     use GuzzleHttp\Promise;
 *
 *     function createPromise($value) {
 *         return new Promise\FulfilledPromise($value);
 *     }
 *
 *     $promise = Promise\coroutine(function () {
 *         $value = (yield createPromise('a'));
 *         try {
 *             $value = (yield createPromise($value . 'b'));
 *         } catch (\Exception $e) {
 *             // The promise was rejected.
 *         }
 *         yield $value . 'c';
 *     });
 *
 *     // Outputs "abc"
 *     $promise->then(function ($v) { echo $v; });
 *
 * @param callable $generatorFn Generator function to wrap into a promise.
 *
 * @return Promise
 * @link https://github.com/petkaantonov/bluebird/blob/master/API.md#generators inspiration
 */
final class Coroutine implements PromiseInterface
{
    /**
     * @var PromiseInterface|null
     */
    private $currentPromise;

    /**
     * @var Generator
     */
    private $generator;

    /**
     * @var Promise
     */
    private $result;

    public function __construct(callable $generatorFn)
    {
        $this->generator = $generatorFn();
        $this->result = new Promise(function () {
            while (isset($this->currentPromise)) {
                $this->currentPromise->wait();
            }
        });
        $this->nextCoroutine($this->generator->current());
    }

    public function then(
        callable $onFulfilled = null,
        callable $onRejected = null
    ) {
        return $this->result->then($onFulfilled, $onRejected);
    }

    public function otherwise(callable $onRejected)
    {
        return $this->result->otherwise($onRejected);
    }

    public function wait($unwrap = true)
    {
        return $this->result->wait($unwrap);
    }

    public function getState()
    {
        return $this->result->getState();
    }

    public function resolve($value)
    {
        $this->result->resolve($value);
    }

    public function reject($reason)
    {
        $this->result->reject($reason);
    }

    public function cancel()
    {
        $this->currentPromise->cancel();
        $this->result->cancel();
    }

    private function nextCoroutine($yielded)
    {
        $this->currentPromise = promise_for($yielded)
            ->then([$this, '_handleSuccess'], [$this, '_handleFailure']);
    }

    /**
     * @internal
     */
    public function _handleSuccess($value)
    {
        unset($this->currentPromise);
        try {
            $next = $this->generator->send($value);
            if ($this->generator->valid()) {
                $this->nextCoroutine($next);
            } else {
                $this->result->resolve($value);
            }
        } catch (Exception $exception) {
            $this->result->reject($exception);
        } catch (Throwable $throwable) {
            $this->result->reject($throwable);
        }
    }

    /**
     * @internal
     */
    public function _handleFailure($reason)
    {
        unset($this->currentPromise);
        try {
            $nextYield = $this->generator->throw(exception_for($reason));
            // The throw was caught, so keep iterating on the coroutine
            $this->nextCoroutine($nextYield);
        } catch (Exception $exception) {
            $this->result->reject($exception);
        } catch (Throwable $throwable) {
            $this->result->reject($throwable);
        }
    }
}

haha - 2025