Added InputTypeFilterIterator class

src/Input/InputTypeFilterIterator.php

@@ -0,0 +1,39 @@
+<?php
+
+declare(strict_types=1);
+
+namespace pointybeard\Helpers\Cli\Input;
+
+class InputTypeFilterIterator extends \FilterIterator {
+
+    private $types;
+    private $mode;
+
+    public const FILTER_INCLUDE = 0x0001;
+    public const FILTER_EXCLUDE = 0x0002;
+
+    public function __construct(\Iterator $iterator, array $types=[], int $mode=self::FILTER_INCLUDE)
+    {
+        parent::__construct($iterator);
+
+        $this->types = array_map('strtolower', $types);
+        $this->mode = $mode;
+
+    }
+    public function accept()
+    {
+        $input = $this->getInnerIterator()->current();
+
+        switch($this->mode) {
+            case self::FILTER_EXCLUDE:
+                return !in_array($input->getType(), $this->types);
+                break;
+
+            case self::FILTER_INCLUDE:
+            default:
+                return in_array($input->getType(), $this->types);
+                break;
+
+        }
+    }
+}