56 lines
1.4 KiB
PHP
56 lines
1.4 KiB
PHP
<?php
|
|
|
|
namespace Illuminate\Support\Traits;
|
|
|
|
use Closure;
|
|
use Illuminate\Support\Reflector;
|
|
use ReflectionFunction;
|
|
use RuntimeException;
|
|
|
|
trait ReflectsClosures
|
|
{
|
|
/**
|
|
* Get the class names / types of the parameters of the given Closure.
|
|
*
|
|
* @param \Closure $closure
|
|
* @return array
|
|
*
|
|
* @throws \ReflectionException
|
|
*/
|
|
protected function closureParameterTypes(Closure $closure)
|
|
{
|
|
$reflection = new ReflectionFunction($closure);
|
|
|
|
return collect($reflection->getParameters())->mapWithKeys(function ($parameter) {
|
|
if ($parameter->isVariadic()) {
|
|
return [$parameter->getName() => null];
|
|
}
|
|
|
|
return [$parameter->getName() => Reflector::getParameterClassName($parameter)];
|
|
})->all();
|
|
}
|
|
|
|
/**
|
|
* Get the class name of the first parameter of the given Closure.
|
|
*
|
|
* @param \Closure $closure
|
|
* @return string
|
|
*
|
|
* @throws \ReflectionException|\RuntimeException
|
|
*/
|
|
protected function firstClosureParameterType(Closure $closure)
|
|
{
|
|
$types = array_values($this->closureParameterTypes($closure));
|
|
|
|
if (! $types) {
|
|
throw new RuntimeException('The given Closure has no parameters.');
|
|
}
|
|
|
|
if ($types[0] === null) {
|
|
throw new RuntimeException('The first parameter of the given Closure is missing a type hint.');
|
|
}
|
|
|
|
return $types[0];
|
|
}
|
|
}
|