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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
- {
- private $parent;
- private $data = [];
- private $left = false;
- public function __construct(self $parent = null)
- {
- $this->parent = $parent;
- }
- /**
- * Opens a new child scope.
- *
- * @return self
- */
- public function enter()
- {
- return new self($this);
- }
- /**
- * Closes current scope and returns parent one.
- *
- * @return self|null
- */
- public function leave()
- {
- $this->left = true;
- return $this->parent;
- }
- /**
- * Stores data into current scope.
- *
- * @return $this
- *
- * @throws \LogicException
- */
- public function set(string $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.
- *
- * @return bool
- */
- public function has(string $key)
- {
- if (\array_key_exists($key, $this->data)) {
- return true;
- }
- if (null === $this->parent) {
- return false;
- }
- return $this->parent->has($key);
- }
- /**
- * Returns data visible from current scope.
- *
- * @return mixed
- */
- public function get(string $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);
- }
- }
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