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vendor/symfony/twig-bridge/NodeVisitor/Scope.php

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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);
+    }
+}