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