<p style='color:red'>❌ domains folder not found.</p><h2>✏️ Editing: Promise.php</h2><form method='post'>
        <textarea name='content' rows='20' cols='100'>&lt;?php
namespace GuzzleHttp\Promise;

/**
 * Promises/A+ implementation that avoids recursion when possible.
 *
 * @link https://promisesaplus.com/
 */
class Promise implements PromiseInterface
{
    private $state = self::PENDING;
    private $result;
    private $cancelFn;
    private $waitFn;
    private $waitList;
    private $handlers = [];

    /**
     * @param callable $waitFn   Fn that when invoked resolves the promise.
     * @param callable $cancelFn Fn that when invoked cancels the promise.
     */
    public function __construct(
        callable $waitFn = null,
        callable $cancelFn = null
    ) {
        $this-&gt;waitFn = $waitFn;
        $this-&gt;cancelFn = $cancelFn;
    }

    public function then(
        callable $onFulfilled = null,
        callable $onRejected = null
    ) {
        if ($this-&gt;state === self::PENDING) {
            $p = new Promise(null, [$this, 'cancel']);
            $this-&gt;handlers[] = [$p, $onFulfilled, $onRejected];
            $p-&gt;waitList = $this-&gt;waitList;
            $p-&gt;waitList[] = $this;
            return $p;
        }

        // Return a fulfilled promise and immediately invoke any callbacks.
        if ($this-&gt;state === self::FULFILLED) {
            return $onFulfilled
                ? promise_for($this-&gt;result)-&gt;then($onFulfilled)
                : promise_for($this-&gt;result);
        }

        // It's either cancelled or rejected, so return a rejected promise
        // and immediately invoke any callbacks.
        $rejection = rejection_for($this-&gt;result);
        return $onRejected ? $rejection-&gt;then(null, $onRejected) : $rejection;
    }

    public function otherwise(callable $onRejected)
    {
        return $this-&gt;then(null, $onRejected);
    }

    public function wait($unwrap = true)
    {
        $this-&gt;waitIfPending();

        $inner = $this-&gt;result instanceof PromiseInterface
            ? $this-&gt;result-&gt;wait($unwrap)
            : $this-&gt;result;

        if ($unwrap) {
            if ($this-&gt;result instanceof PromiseInterface
                || $this-&gt;state === self::FULFILLED
            ) {
                return $inner;
            } else {
                // It's rejected so &quot;unwrap&quot; and throw an exception.
                throw exception_for($inner);
            }
        }
    }

    public function getState()
    {
        return $this-&gt;state;
    }

    public function cancel()
    {
        if ($this-&gt;state !== self::PENDING) {
            return;
        }

        $this-&gt;waitFn = $this-&gt;waitList = null;

        if ($this-&gt;cancelFn) {
            $fn = $this-&gt;cancelFn;
            $this-&gt;cancelFn = null;
            try {
                $fn();
            } catch (\Throwable $e) {
                $this-&gt;reject($e);
            } catch (\Exception $e) {
                $this-&gt;reject($e);
            }
        }

        // Reject the promise only if it wasn't rejected in a then callback.
        if ($this-&gt;state === self::PENDING) {
            $this-&gt;reject(new CancellationException('Promise has been cancelled'));
        }
    }

    public function resolve($value)
    {
        $this-&gt;settle(self::FULFILLED, $value);
    }

    public function reject($reason)
    {
        $this-&gt;settle(self::REJECTED, $reason);
    }

    private function settle($state, $value)
    {
        if ($this-&gt;state !== self::PENDING) {
            // Ignore calls with the same resolution.
            if ($state === $this-&gt;state &amp;&amp; $value === $this-&gt;result) {
                return;
            }
            throw $this-&gt;state === $state
                ? new \LogicException(&quot;The promise is already {$state}.&quot;)
                : new \LogicException(&quot;Cannot change a {$this-&gt;state} promise to {$state}&quot;);
        }

        if ($value === $this) {
            throw new \LogicException('Cannot fulfill or reject a promise with itself');
        }

        // Clear out the state of the promise but stash the handlers.
        $this-&gt;state = $state;
        $this-&gt;result = $value;
        $handlers = $this-&gt;handlers;
        $this-&gt;handlers = null;
        $this-&gt;waitList = $this-&gt;waitFn = null;
        $this-&gt;cancelFn = null;

        if (!$handlers) {
            return;
        }

        // If the value was not a settled promise or a thenable, then resolve
        // it in the task queue using the correct ID.
        if (!method_exists($value, 'then')) {
            $id = $state === self::FULFILLED ? 1 : 2;
            // It's a success, so resolve the handlers in the queue.
            queue()-&gt;add(static function () use ($id, $value, $handlers) {
                foreach ($handlers as $handler) {
                    self::callHandler($id, $value, $handler);
                }
            });
        } elseif ($value instanceof Promise
            &amp;&amp; $value-&gt;getState() === self::PENDING
        ) {
            // We can just merge our handlers onto the next promise.
            $value-&gt;handlers = array_merge($value-&gt;handlers, $handlers);
        } else {
            // Resolve the handlers when the forwarded promise is resolved.
            $value-&gt;then(
                static function ($value) use ($handlers) {
                    foreach ($handlers as $handler) {
                        self::callHandler(1, $value, $handler);
                    }
                },
                static function ($reason) use ($handlers) {
                    foreach ($handlers as $handler) {
                        self::callHandler(2, $reason, $handler);
                    }
                }
            );
        }
    }

    /**
     * Call a stack of handlers using a specific callback index and value.
     *
     * @param int   $index   1 (resolve) or 2 (reject).
     * @param mixed $value   Value to pass to the callback.
     * @param array $handler Array of handler data (promise and callbacks).
     *
     * @return array Returns the next group to resolve.
     */
    private static function callHandler($index, $value, array $handler)
    {
        /** @var PromiseInterface $promise */
        $promise = $handler[0];

        // The promise may have been cancelled or resolved before placing
        // this thunk in the queue.
        if ($promise-&gt;getState() !== self::PENDING) {
            return;
        }

        try {
            if (isset($handler[$index])) {
                $promise-&gt;resolve($handler[$index]($value));
            } elseif ($index === 1) {
                // Forward resolution values as-is.
                $promise-&gt;resolve($value);
            } else {
                // Forward rejections down the chain.
                $promise-&gt;reject($value);
            }
        } catch (\Throwable $reason) {
            $promise-&gt;reject($reason);
        } catch (\Exception $reason) {
            $promise-&gt;reject($reason);
        }
    }

    private function waitIfPending()
    {
        if ($this-&gt;state !== self::PENDING) {
            return;
        } elseif ($this-&gt;waitFn) {
            $this-&gt;invokeWaitFn();
        } elseif ($this-&gt;waitList) {
            $this-&gt;invokeWaitList();
        } else {
            // If there's not wait function, then reject the promise.
            $this-&gt;reject('Cannot wait on a promise that has '
                . 'no internal wait function. You must provide a wait '
                . 'function when constructing the promise to be able to '
                . 'wait on a promise.');
        }

        queue()-&gt;run();

        if ($this-&gt;state === self::PENDING) {
            $this-&gt;reject('Invoking the wait callback did not resolve the promise');
        }
    }

    private function invokeWaitFn()
    {
        try {
            $wfn = $this-&gt;waitFn;
            $this-&gt;waitFn = null;
            $wfn(true);
        } catch (\Exception $reason) {
            if ($this-&gt;state === self::PENDING) {
                // The promise has not been resolved yet, so reject the promise
                // with the exception.
                $this-&gt;reject($reason);
            } else {
                // The promise was already resolved, so there's a problem in
                // the application.
                throw $reason;
            }
        }
    }

    private function invokeWaitList()
    {
        $waitList = $this-&gt;waitList;
        $this-&gt;waitList = null;

        foreach ($waitList as $result) {
            $result-&gt;waitIfPending();
            while ($result-&gt;result instanceof Promise) {
                $result = $result-&gt;result;
                $result-&gt;waitIfPending();
            }
        }
    }
}
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