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<?php
namespace Illuminate\View\Engines;
use Closure;
use InvalidArgumentException;
class EngineResolver
{
/**
* The array of engine resolvers.
*
* @var array
*/
protected $resolvers = [];
/**
* The resolved engine instances.
*
* @var array
*/
protected $resolved = [];
/**
* Register a new engine resolver.
*
* The engine string typically corresponds to a file extension.
*
* @param string $engine
* @param \Closure $resolver
* @return void
*/
public function register($engine, Closure $resolver)
{
unset($this->resolved[$engine]);
$this->resolvers[$engine] = $resolver;
}
/**
* Resolve an engine instance by name.
*
* @param string $engine
* @return \Illuminate\Contracts\View\Engine
*
* @throws \InvalidArgumentException
*/
public function resolve($engine)
{
if (isset($this->resolved[$engine])) {
return $this->resolved[$engine];
}
if (isset($this->resolvers[$engine])) {
return $this->resolved[$engine] = call_user_func($this->resolvers[$engine]);
}
throw new InvalidArgumentException("Engine [{$engine}] not found.");
}
}
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