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<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Bridge\Twig\NodeVisitor;
/**
* @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
*/
class Scope
{
/**
* @var Scope|null
*/
private $parent;
/**
* @var Scope[]
*/
private $children;
/**
* @var array
*/
private $data = array();
/**
* @var boolean
*/
private $left = false;
/**
* @param Scope $parent
*/
public function __construct(Scope $parent = null)
{
$this->parent = $parent;
}
/**
* Opens a new child scope.
*
* @return Scope
*/
public function enter()
{
$child = new self($this);
$this->children[] = $child;
return $child;
}
/**
* Closes current scope and returns parent one.
*
* @return Scope|null
*/
public function leave()
{
$this->left = true;
return $this->parent;
}
/**
* Stores data into current scope.
*
* @param string $key
* @param mixed $value
*
* @throws \LogicException
*
* @return Scope Current scope
*/
public function set($key, $value)
{
if ($this->left) {
throw new \LogicException('Left scope is not mutable.');
}
$this->data[$key] = $value;
return $this;
}
/**
* Tests if a data is visible from current scope.
*
* @param string $key
*
* @return boolean
*/
public function has($key)
{
if (array_key_exists($key, $this->data)) {
return true;
}
if (null === $this->parent) {
return false;
}
return $this->parent->has($key);
}
/**
* Returns data visible from current scope.
*
* @param string $key
* @param mixed $default
*
* @return mixed
*/
public function get($key, $default = null)
{
if (array_key_exists($key, $this->data)) {
return $this->data[$key];
}
if (null === $this->parent) {
return $default;
}
return $this->parent->get($key, $default);
}
}