Initial Drupal 11 with DDEV setup

vendor/mck89/peast/lib/Peast/Syntax/EventsEmitter.php

@@ -0,0 +1,62 @@
+<?php
+/**
+ * This file is part of the Peast package
+ *
+ * (c) Marco Marchiò <marco.mm89@gmail.com>
+ *
+ * For the full copyright and license information refer to the LICENSE file
+ * distributed with this source code
+ */
+namespace Peast\Syntax;
+
+/**
+ * Events emitter class. An instance of this class is used by Parser and Scanner
+ * to emit events and attach listeners to them
+ * 
+ * @author Marco Marchiò <marco.mm89@gmail.com>
+ */
+class EventsEmitter
+{
+    /**
+     * Events registry array
+     *
+     * @var array
+     */
+    protected $eventsRegistry = array();
+    
+    /**
+     * Attaches a listener function to the given event
+     * 
+     * @param string    $event      Event name
+     * @param callable  $listener   Listener function
+     * 
+     * @return $this
+     */
+    public function addListener($event, $listener)
+    {
+        if (!isset($this->eventsRegistry[$event])) {
+            $this->eventsRegistry[$event] = array();
+        }
+        $this->eventsRegistry[$event][] = $listener;
+        return $this;
+    }
+    
+    /**
+     * Fires an event
+     * 
+     * @param string    $event  Event name
+     * @param array     $args   Arguments to pass to functions attached to the
+     *                          event
+     * 
+     * @return $this
+     */
+    public function fire($event, $args = array())
+    {
+        if (isset($this->eventsRegistry[$event])) {
+            foreach ($this->eventsRegistry[$event] as $listener) {
+                call_user_func_array($listener, $args);
+            }
+        }
+        return $this;
+    }
+}