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Directory >> /home/whitjouh/public_html/core/vendor/guzzlehttp/promises/src/

File / Folder	Size	Action
.	-
AggregateException.php	0.403KB	edt ren
CancellationException.php	0.204KB	edt ren
Coroutine.php	4.063KB	edt ren
Create.php	1.964KB	edt ren
Each.php	2.597KB	edt ren
EachPromise.php	7.415KB	edt ren
FulfilledPromise.php	1.995KB	edt ren
Is.php	0.919KB	edt ren
Promise.php	8.747KB	edt ren
PromiseInterface.php	2.757KB	edt ren
PromisorInterface.php	0.243KB	edt ren
RejectedPromise.php	2.213KB	edt ren
RejectionException.php	1.211KB	edt ren
TaskQueue.php	1.967KB	edt ren
TaskQueueInterface.php	0.439KB	edt ren
Utils.php	8.18KB	edt ren

<?php

declare(strict_types=1);

namespace 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 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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