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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;
}
}