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<?php declare(strict_types=1);
/*
* This file is part of sebastian/object-enumerator.
*
* (c) Sebastian Bergmann <sebastian@phpunit.de>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace SebastianBergmann\ObjectEnumerator;
use function array_merge;
use function func_get_args;
use function is_array;
use function is_object;
use SebastianBergmann\ObjectReflector\ObjectReflector;
use SebastianBergmann\RecursionContext\Context;
/**
* Traverses array structures and object graphs
* to enumerate all referenced objects.
*/
class Enumerator
{
/**
* Returns an array of all objects referenced either
* directly or indirectly by a variable.
*
* @param array|object $variable
*
* @return object[]
*/
public function enumerate($variable)
{
if (!is_array($variable) && !is_object($variable)) {
throw new InvalidArgumentException;
}
if (isset(func_get_args()[1])) {
if (!func_get_args()[1] instanceof Context) {
throw new InvalidArgumentException;
}
$processed = func_get_args()[1];
} else {
$processed = new Context;
}
$objects = [];
if ($processed->contains($variable)) {
return $objects;
}
$array = $variable;
$processed->add($variable);
if (is_array($variable)) {
foreach ($array as $element) {
if (!is_array($element) && !is_object($element)) {
continue;
}
$objects = array_merge(
$objects,
$this->enumerate($element, $processed)
);
}
} else {
$objects[] = $variable;
$reflector = new ObjectReflector;
foreach ($reflector->getAttributes($variable) as $value) {
if (!is_array($value) && !is_object($value)) {
continue;
}
$objects = array_merge(
$objects,
$this->enumerate($value, $processed)
);
}
}
return $objects;
}
}