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<?php declare(strict_types=1);
/*
* This file is part of sebastian/recursion-context.
*
* (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;
use const PHP_INT_MAX;
use const PHP_INT_MIN;
use function array_key_exists;
use function array_pop;
use function array_slice;
use function count;
use function is_array;
use function is_object;
use function random_int;
use function spl_object_hash;
use SplObjectStorage;
/**
* 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 = [];
$this->objects = new SplObjectStorage;
}
/**
* @codeCoverageIgnore
*/
public function __destruct()
{
foreach ($this->arrays as &$array) {
if (is_array($array)) {
array_pop($array);
array_pop($array);
}
}
}
/**
* Adds a value to the context.
*
* @param array|object $value the value to add
*
* @throws InvalidArgumentException Thrown if $value is not an array or object
*
* @return bool|int|string the ID of the stored value, either as a string or integer
*
* @psalm-template T
* @psalm-param T $value
* @param-out T $value
*/
public function add(&$value)
{
if (is_array($value)) {
return $this->addArray($value);
}
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
*
* @throws InvalidArgumentException Thrown if $value is not an array or object
*
* @return false|int|string the string or integer ID of the stored value if it has already been seen, or false if the value is not stored
*
* @psalm-template T
* @psalm-param T $value
* @param-out T $value
*/
public function contains(&$value)
{
if (is_array($value)) {
return $this->containsArray($value);
}
if (is_object($value)) {
return $this->containsObject($value);
}
throw new InvalidArgumentException(
'Only arrays and objects are supported'
);
}
/**
* @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 (!array_key_exists(PHP_INT_MAX, $array) && !array_key_exists(PHP_INT_MAX - 1, $array)) {
$array[] = $key;
$array[] = $this->objects;
} else { /* cover the improbable case too */
/* Note that array_slice (used in containsArray) will return the
* last two values added *not necessarily* the highest integer
* keys in the array, so the order of these writes to $array
* is important, but the actual keys used is not. */
do {
$key = random_int(PHP_INT_MIN, PHP_INT_MAX);
} while (array_key_exists($key, $array));
$array[$key] = $key;
do {
$key = random_int(PHP_INT_MIN, PHP_INT_MAX);
} while (array_key_exists($key, $array));
$array[$key] = $this->objects;
}
return $key;
}
/**
* @param object $object
*/
private function addObject($object): string
{
if (!$this->objects->contains($object)) {
$this->objects->attach($object);
}
return spl_object_hash($object);
}
/**
* @return false|int
*/
private function containsArray(array &$array)
{
$end = array_slice($array, -2);
return isset($end[1]) && $end[1] === $this->objects ? $end[0] : false;
}
/**
* @param object $value
*
* @return false|string
*/
private function containsObject($value)
{
if ($this->objects->contains($value)) {
return spl_object_hash($value);
}
return false;
}
}
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