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