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ðŸ“ ..
ðŸ“„ AggregateException.php(422 B)
ðŸ“„ CancellationException.php(218 B)
ðŸ“„ Coroutine.php(4.08 KB)
ðŸ“„ Create.php(1.97 KB)
ðŸ“„ Each.php(2.61 KB)
ðŸ“„ EachPromise.php(7.42 KB)
ðŸ“„ FulfilledPromise.php(2 KB)
ðŸ“„ Is.php(950 B)
ðŸ“„ Promise.php(8.76 KB)
ðŸ“„ PromiseInterface.php(2.77 KB)
ðŸ“„ PromisorInterface.php(258 B)
ðŸ“„ RejectedPromise.php(2.22 KB)
ðŸ“„ RejectionException.php(1.22 KB)
ðŸ“„ TaskQueue.php(1.98 KB)
ðŸ“„ TaskQueueInterface.php(459 B)
ðŸ“„ Utils.php(8.2 KB)

Editing: Coroutine.php

<?php

declare(strict_types=1);

namespace Depicter\GuzzleHttp\Promise;

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::of method 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 Depicter\GuzzleHttp\Promise;
 *
 *     function createPromise($value) {
 *         return new Promise\FulfilledPromise($value);
 *     }
 *
 *     $promise = Promise\Coroutine::of(function () {
 *         $value = (yield createPromise('a'));
 *         try {
 *             $value = (yield createPromise($value . 'b'));
 *         } catch (\Throwable $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
 *
 * @see 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();
        $this->result = new Promise(function (): void {
            while (isset($this->currentPromise)) {
                $this->currentPromise->wait();
            }
        });
        try {
            $this->nextCoroutine($this->generator->current());
        } catch (Throwable $throwable) {
            $this->result->reject($throwable);
        }
    }

/**
     * Create a new coroutine.
     */
    public static function of(callable $generatorFn): self
    {
        return new self($generatorFn);
    }

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

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

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

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

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

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

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

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

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

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

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