/usr/share/php/React/Promise/Promise.php is in php-react-promise 2.1.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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namespace React\Promise;
class Promise implements CancellablePromiseInterface
{
private $canceller;
private $result;
private $handlers = [];
private $progressHandlers = [];
private $requiredCancelRequests = 0;
private $cancelRequests = 0;
public function __construct(callable $resolver, callable $canceller = null)
{
$this->canceller = $canceller;
$this->call($resolver);
}
public function then(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
{
if (null !== $this->result) {
return $this->result->then($onFulfilled, $onRejected, $onProgress);
}
if (null === $this->canceller) {
return new static($this->resolver($onFulfilled, $onRejected, $onProgress));
}
$this->requiredCancelRequests++;
return new static($this->resolver($onFulfilled, $onRejected, $onProgress), function ($resolve, $reject, $progress) {
if (++$this->cancelRequests < $this->requiredCancelRequests) {
return;
}
$this->cancel();
});
}
public function cancel()
{
if (null === $this->canceller || null !== $this->result) {
return;
}
$this->call($this->canceller);
}
private function resolver(callable $onFulfilled = null, callable $onRejected = null, callable $onProgress = null)
{
return function ($resolve, $reject, $progress) use ($onFulfilled, $onRejected, $onProgress) {
if ($onProgress) {
$progressHandler = function ($update) use ($progress, $onProgress) {
try {
$progress($onProgress($update));
} catch (\Exception $e) {
$progress($e);
}
};
} else {
$progressHandler = $progress;
}
$this->handlers[] = function (PromiseInterface $promise) use ($onFulfilled, $onRejected, $resolve, $reject, $progressHandler) {
$promise
->then($onFulfilled, $onRejected)
->then($resolve, $reject, $progressHandler);
};
$this->progressHandlers[] = $progressHandler;
};
}
private function resolve($value = null)
{
if (null !== $this->result) {
return;
}
$this->settle(resolve($value));
}
private function reject($reason = null)
{
if (null !== $this->result) {
return;
}
$this->settle(reject($reason));
}
private function progress($update = null)
{
if (null !== $this->result) {
return;
}
foreach ($this->progressHandlers as $handler) {
$handler($update);
}
}
private function settle(PromiseInterface $result)
{
foreach ($this->handlers as $handler) {
$handler($result);
}
$this->progressHandlers = $this->handlers = [];
$this->result = $result;
}
private function call(callable $callback)
{
try {
$callback(
function ($value = null) {
$this->resolve($value);
},
function ($reason = null) {
$this->reject($reason);
},
function ($update = null) {
$this->progress($update);
}
);
} catch (\Exception $e) {
$this->reject($e);
}
}
}
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