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