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<?php namespace Illuminate\Support\Traits; use Closure; use Illuminate\Support\Collection; use Illuminate\Support\Reflector; use ReflectionFunction; use ReflectionIntersectionType; use ReflectionUnionType; use RuntimeException; trait ReflectsClosures { /** * Get the class name of the first parameter of the given Closure. * * @param \Closure $closure * @return string * * @throws \ReflectionException * @throws \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]; } /** * Get the class names of the first parameter of the given Closure, including union types. * * @param \Closure $closure * @return array * * @throws \ReflectionException * @throws \RuntimeException */ protected function firstClosureParameterTypes(Closure $closure) { $reflection = new ReflectionFunction($closure); $types = (new Collection($reflection->getParameters())) ->mapWithKeys(function ($parameter) { if ($parameter->isVariadic()) { return [$parameter->getName() => null]; } return [$parameter->getName() => Reflector::getParameterClassNames($parameter)]; }) ->filter() ->values() ->all(); if (empty($types)) { throw new RuntimeException('The given Closure has no parameters.'); } if (isset($types[0]) && empty($types[0])) { throw new RuntimeException('The first parameter of the given Closure is missing a type hint.'); } return $types[0]; } /** * 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 (new Collection($reflection->getParameters())) ->mapWithKeys(function ($parameter) { if ($parameter->isVariadic()) { return [$parameter->getName() => null]; } return [$parameter->getName() => Reflector::getParameterClassName($parameter)]; }) ->all(); } /** * Get the class names / types of the return type of the given Closure. * * @param \Closure $closure * @return list<class-string> * * @throws \ReflectionException */ protected function closureReturnTypes(Closure $closure) { $reflection = new ReflectionFunction($closure); if ($reflection->getReturnType() === null || $reflection->getReturnType() instanceof ReflectionIntersectionType) { return []; } $types = $reflection->getReturnType() instanceof ReflectionUnionType ? $reflection->getReturnType()->getTypes() : [$reflection->getReturnType()]; return (new Collection($types)) ->reject(fn ($type) => $type->isBuiltin()) ->reject(fn ($type) => in_array($type->getName(), ['static', 'self'])) ->map(fn ($type) => $type->getName()) ->values() ->all(); } }
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