Verzeichnisstruktur phpBB-3.2.0
- Veröffentlicht
- 06.01.2017
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Scope.php
001 <?php
002
003 /*
004 * This file is part of the Symfony package.
005 *
006 * (c) Fabien Potencier <fabien@symfony.com>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace Symfony\Bridge\Twig\NodeVisitor;
013
014 /**
015 * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
016 */
017 class Scope
018 {
019 /**
020 * @var Scope|null
021 */
022 private $parent;
023
024 /**
025 * @var array
026 */
027 private $data = array();
028
029 /**
030 * @var bool
031 */
032 private $left = false;
033
034 /**
035 * @param Scope $parent
036 */
037 public function __construct(Scope $parent = null)
038 {
039 $this->parent = $parent;
040 }
041
042 /**
043 * Opens a new child scope.
044 *
045 * @return Scope
046 */
047 public function enter()
048 {
049 return new self($this);
050 }
051
052 /**
053 * Closes current scope and returns parent one.
054 *
055 * @return Scope|null
056 */
057 public function leave()
058 {
059 $this->left = true;
060
061 return $this->parent;
062 }
063
064 /**
065 * Stores data into current scope.
066 *
067 * @param string $key
068 * @param mixed $value
069 *
070 * @return Scope Current scope
071 *
072 * @throws \LogicException
073 */
074 public function set($key, $value)
075 {
076 if ($this->left) {
077 throw new \LogicException('Left scope is not mutable.');
078 }
079
080 $this->data[$key] = $value;
081
082 return $this;
083 }
084
085 /**
086 * Tests if a data is visible from current scope.
087 *
088 * @param string $key
089 *
090 * @return bool
091 */
092 public function has($key)
093 {
094 if (array_key_exists($key, $this->data)) {
095 return true;
096 }
097
098 if (null === $this->parent) {
099 return false;
100 }
101
102 return $this->parent->has($key);
103 }
104
105 /**
106 * Returns data visible from current scope.
107 *
108 * @param string $key
109 * @param mixed $default
110 *
111 * @return mixed
112 */
113 public function get($key, $default = null)
114 {
115 if (array_key_exists($key, $this->data)) {
116 return $this->data[$key];
117 }
118
119 if (null === $this->parent) {
120 return $default;
121 }
122
123 return $this->parent->get($key, $default);
124 }
125 }
126