Implement Icinga\Util\Enumerate

library/Icinga/Util/Enumerate.php

@@ -0,0 +1,62 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+// {{{ICINGA_LICENSE_HEADER}}}
+
+namespace Icinga\Util;
+
+use Iterator;
+
+/**
+ * Class Enumerate
+ *
+ * @see https://docs.python.org/2/library/functions.html#enumerate
+ *
+ * @package Icinga\Util
+ */
+class Enumerate implements Iterator
+{
+    /**
+     * @var Iterator
+     */
+    protected $iterator;
+
+    /**
+     * @var int
+     */
+    protected $key;
+
+    /**
+     * @param Iterator $iterator
+     */
+    public function __construct(Iterator $iterator)
+    {
+        $this->iterator = $iterator;
+    }
+
+    public function rewind()
+    {
+        $this->iterator->rewind();
+        $this->key = 0;
+    }
+
+    public function next()
+    {
+        $this->iterator->next();
+        ++$this->key;
+    }
+
+    public function valid()
+    {
+        return $this->iterator->valid();
+    }
+
+    public function current()
+    {
+        return $this->iterator->current();
+    }
+
+    public function key()
+    {
+        return $this->key;
+    }
+}