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<?php
namespace Illuminate\Routing;
use ReflectionMethod;
use ReflectionParameter;
use Illuminate\Support\Arr;
use ReflectionFunctionAbstract;
trait RouteDependencyResolverTrait
{
/**
* Resolve the object method's type-hinted dependencies.
*
* @param array $parameters
* @param object $instance
* @param string $method
* @return array
*/
protected function resolveClassMethodDependencies(array $parameters, $instance, $method)
{
if (! method_exists($instance, $method)) {
return $parameters;
}
return $this->resolveMethodDependencies(
$parameters, new ReflectionMethod($instance, $method)
);
}
/**
* Resolve the given method's type-hinted dependencies.
*
* @param array $parameters
* @param \ReflectionFunctionAbstract $reflector
* @return array
*/
public function resolveMethodDependencies(array $parameters, ReflectionFunctionAbstract $reflector)
{
$instanceCount = 0;
$values = array_values($parameters);
foreach ($reflector->getParameters() as $key => $parameter) {
$instance = $this->transformDependency(
$parameter, $parameters
);
if (! is_null($instance)) {
$instanceCount++;
$this->spliceIntoParameters($parameters, $key, $instance);
} elseif (! isset($values[$key - $instanceCount]) &&
$parameter->isDefaultValueAvailable()) {
$this->spliceIntoParameters($parameters, $key, $parameter->getDefaultValue());
}
}
return $parameters;
}
/**
* Attempt to transform the given parameter into a class instance.
*
* @param \ReflectionParameter $parameter
* @param array $parameters
* @return mixed
*/
protected function transformDependency(ReflectionParameter $parameter, $parameters)
{
$class = $parameter->getClass();
// If the parameter has a type-hinted class, we will check to see if it is already in
// the list of parameters. If it is we will just skip it as it is probably a model
// binding and we do not want to mess with those; otherwise, we resolve it here.
if ($class && ! $this->alreadyInParameters($class->name, $parameters)) {
return $parameter->isDefaultValueAvailable()
? $parameter->getDefaultValue()
: $this->container->make($class->name);
}
}
/**
* Determine if an object of the given class is in a list of parameters.
*
* @param string $class
* @param array $parameters
* @return bool
*/
protected function alreadyInParameters($class, array $parameters)
{
return ! is_null(Arr::first($parameters, function ($value) use ($class) {
return $value instanceof $class;
}));
}
/**
* Splice the given value into the parameter list.
*
* @param array $parameters
* @param string $offset
* @param mixed $value
* @return void
*/
protected function spliceIntoParameters(array &$parameters, $offset, $value)
{
array_splice(
$parameters, $offset, 0, [$value]
);
}
}