add @CommandArgument annotation

* add @CommandArgument and relevant event changes

* fix unknown bug

* remove relative constant for CommandArgument

src/ZM/Event/EventMapIterator.php

@@ -0,0 +1,61 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ZM\Event;
+
+use Iterator;
+use ReturnTypeWillChange;
+
+class EventMapIterator implements Iterator
+{
+    private $offset = 0;
+
+    private $class;
+
+    private $method;
+
+    private $event_name;
+
+    public function __construct($class, $method, $event_name)
+    {
+        $this->class = $class;
+        $this->method = $method;
+        $this->event_name = $event_name;
+        $this->nextToValid();
+    }
+
+    public function current()
+    {
+        return EventManager::$event_map[$this->class][$this->method][$this->offset];
+    }
+
+    public function next(): void
+    {
+        ++$this->offset;
+        $this->nextToValid();
+    }
+
+    #[ReturnTypeWillChange]
+    public function key()
+    {
+        return $this->offset;
+    }
+
+    public function valid(): bool
+    {
+        return isset(EventManager::$event_map[$this->class][$this->method][$this->offset]);
+    }
+
+    public function rewind(): void
+    {
+        $this->offset = 0;
+    }
+
+    private function nextToValid()
+    {
+        while ($this->valid() && !is_a($this->current(), $this->event_name, true)) {
+            ++$this->offset;
+        }
+    }
+}