From 9d2318d828ce28c53d43d86e704401a7e7f0471b Mon Sep 17 00:00:00 2001
From: Oliver Vogel <oliver@olivervogel.com>
Date: Fri, 11 Feb 2022 19:33:29 +0100
Subject: [PATCH] Added ModifierStack class

---
 src/ModifierStack.php      | 28 ++++++++++++++++++++++++++++
 tests/ModiferStackTest.php | 25 +++++++++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 src/ModifierStack.php
 create mode 100644 tests/ModiferStackTest.php

diff --git a/src/ModifierStack.php b/src/ModifierStack.php
new file mode 100644
index 00000000..13eac80a
--- /dev/null
+++ b/src/ModifierStack.php
@@ -0,0 +1,28 @@
+<?php
+
+namespace Intervention\Image;
+
+use Intervention\Image\Interfaces\ImageInterface;
+use Intervention\Image\Interfaces\ModifierInterface;
+
+class ModifierStack implements ModifierInterface
+{
+    public function __construct(protected array $modifiers)
+    {
+        //
+    }
+
+    public function apply(ImageInterface $image): ImageInterface
+    {
+        foreach ($this->modifiers as $modifier) {
+            $modifier->apply($image);
+        }
+    }
+
+    public function push(ModifierInterface $modifier): self
+    {
+        $this->modifiers[] = $modifier;
+
+        return $this;
+    }
+}
diff --git a/tests/ModiferStackTest.php b/tests/ModiferStackTest.php
new file mode 100644
index 00000000..8577d3c1
--- /dev/null
+++ b/tests/ModiferStackTest.php
@@ -0,0 +1,25 @@
+<?php
+
+namespace Intervention\Image\Tests;
+
+use Intervention\Image\Drivers\Gd\Modifiers\GreyscaleModifier;
+use Intervention\Image\ModifierStack;
+
+/**
+ * @covers \Intervention\Image\ModifierStack
+ */
+class ModifierStackTest extends TestCase
+{
+    public function testConstructor(): void
+    {
+        $stack = new ModifierStack([]);
+        $this->assertInstanceOf(ModifierStack::class, $stack);
+    }
+
+    public function testPush(): void
+    {
+        $stack = new ModifierStack([]);
+        $result = $stack->push(new GreyscaleModifier());
+        $this->assertInstanceOf(ModifierStack::class, $result);
+    }
+}