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<?php
/*
 * This file is part of the Recursion Context package.
 *
 * (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\RecursionContext;

/**
 * A context containing previously processed arrays and objects
 * when recursively processing a value.
 */
final class Context
{
    /**
     * @var array[]
     */
    private $arrays;

/**
     * @var \SplObjectStorage
     */
    private $objects;

/**
     * Initialises the context
     */
    public function __construct()
    {
        $this->arrays  = array();
        $this->objects = new \SplObjectStorage;
    }

/**
     * Adds a value to the context.
     *
     * @param array|object $value The value to add.
     *
     * @return int|string The ID of the stored value, either as a string or integer.
     *
     * @throws InvalidArgumentException Thrown if $value is not an array or object
     */
    public function add(&$value)
    {
        if (is_array($value)) {
            return $this->addArray($value);
        } elseif (is_object($value)) {
            return $this->addObject($value);
        }

throw new InvalidArgumentException(
            'Only arrays and objects are supported'
        );
    }

/**
     * Checks if the given value exists within the context.
     *
     * @param array|object $value The value to check.
     *
     * @return int|string|false The string or integer ID of the stored value if it has already been seen, or false if the value is not stored.
     *
     * @throws InvalidArgumentException Thrown if $value is not an array or object
     */
    public function contains(&$value)
    {
        if (is_array($value)) {
            return $this->containsArray($value);
        } elseif (is_object($value)) {
            return $this->containsObject($value);
        }

throw new InvalidArgumentException(
            'Only arrays and objects are supported'
        );
    }

/**
     * @param array $array
     *
     * @return bool|int
     */
    private function addArray(array &$array)
    {
        $key = $this->containsArray($array);

if ($key !== false) {
            return $key;
        }

$key            = count($this->arrays);
        $this->arrays[] = &$array;

if (!isset($array[PHP_INT_MAX]) && !isset($array[PHP_INT_MAX - 1])) {
            $array[] = $key;
            $array[] = $this->objects;
        } else { /* cover the improbable case too */
            do {
                $key = random_int(PHP_INT_MIN, PHP_INT_MAX);
            } while (isset($array[$key]));

$array[$key] = $key;

do {
                $key = random_int(PHP_INT_MIN, PHP_INT_MAX);
            } while (isset($array[$key]));

$array[$key] = $this->objects;
        }

return $key;
    }

/**
     * @param object $object
     *
     * @return string
     */
    private function addObject($object)
    {
        if (!$this->objects->contains($object)) {
            $this->objects->attach($object);
        }

return spl_object_hash($object);
    }

/**
     * @param array $array
     *
     * @return int|false
     */
    private function containsArray(array &$array)
    {
        $end = array_slice($array, -2);

return isset($end[1]) && $end[1] === $this->objects ? $end[0] : false;
    }

/**
     * @param object $value
     *
     * @return string|false
     */
    private function containsObject($value)
    {
        if ($this->objects->contains($value)) {
            return spl_object_hash($value);
        }

return false;
    }

public function __destruct()
    {
        foreach ($this->arrays as &$array) {
            if (is_array($array)) {
                array_pop($array);
                array_pop($array);
            }
        }
    }
}

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