/**
* Resolve toResolve into a closure that that the router can dispatch.
*
* If toResolve is of the format 'class:method', then try to extract 'class'
* from the container otherwise instantiate it and then dispatch 'method'.
*
* @param mixed $toResolve
*
* @return callable
*
* @throws RuntimeException if the callable does not exist
* @throws RuntimeException if the callable is not resolvable
*/
public function resolve($toResolve)
{
$resolved = $toResolve;
if (!is_callable($toResolve) && is_string($toResolve)) {
// check for slim callable as "class:method"
$callablePattern = '!^([^\\:]+)\\:([a-zA-Z_\\x7f-\\xff][a-zA-Z0-9_\\x7f-\\xff]*)$!';
if (preg_match($callablePattern, $toResolve, $matches)) {
$class = $matches[1];
$method = $matches[2];
if ($this->container->has($class)) {
$resolved = [$this->container->get($class), $method];
} else {
if (!class_exists($class)) {
throw new RuntimeException(sprintf('Callable %s does not exist', $class));
}
$resolved = [$this->container->newInstance($class), $method];
}
} else {
// check if string is something in the DIC that's callable or is a class name which
// has an __invoke() method
$class = $toResolve;
if ($this->container->has($class)) {
$resolved = $this->container->get($class);
} else {
if (!class_exists($class)) {
throw new RuntimeException(sprintf('Callable %s does not exist', $class));
}
$resolved = $this->container->newInstance($class);
}
}
}
if (!is_callable($resolved)) {
throw new RuntimeException(sprintf('%s is not resolvable', $toResolve));
}
return $resolved;
}