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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); } else if (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); } else if (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; } $this->arrays[] = &$array; return count($this->arrays) - 1; } /** * @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) { $keys = array_keys($this->arrays, $array, true); $hash = '_Key_' . microtime(true); foreach ($keys as $key) { $this->arrays[$key][$hash] = $hash; if (isset($array[$hash]) && $array[$hash] === $hash) { unset($this->arrays[$key][$hash]); return $key; } unset($this->arrays[$key][$hash]); } return false; } /** * @param object $value * @return string|false */ private function containsObject($value) { if ($this->objects->contains($value)) { return spl_object_hash($value); } return false; } }