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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);
}
}
}