From 393db492948a16f246790b88a38a1235cb167659 Mon Sep 17 00:00:00 2001
From: Igor Scheller <igor.scheller@igorshp.de>
Date: Fri, 21 Dec 2018 23:11:44 +0100
Subject: [PATCH] Renderer: Added twig extension for markdown rendering

---
 src/Renderer/Twig/Extensions/Markdown.php     | 43 ++++++++++++++++++
 src/Renderer/TwigServiceProvider.php          |  2 +
 .../Renderer/Twig/Extensions/MarkdownTest.php | 44 +++++++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100644 src/Renderer/Twig/Extensions/Markdown.php
 create mode 100644 tests/Unit/Renderer/Twig/Extensions/MarkdownTest.php

diff --git a/src/Renderer/Twig/Extensions/Markdown.php b/src/Renderer/Twig/Extensions/Markdown.php
new file mode 100644
index 00000000..293efe91
--- /dev/null
+++ b/src/Renderer/Twig/Extensions/Markdown.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Engelsystem\Renderer\Twig\Extensions;
+
+use Parsedown;
+use Twig_Extension as TwigExtension;
+use Twig_Filter as TwigFilter;
+
+class Markdown extends TwigExtension
+{
+    /** @var Parsedown */
+    protected $renderer;
+
+    /**
+     * @param Parsedown $renderer
+     */
+    public function __construct(Parsedown $renderer)
+    {
+        $this->renderer = $renderer;
+    }
+
+    /**
+     * @return array
+     */
+    public function getFilters(): array
+    {
+        $options = ['is_safe' => ['html']];
+
+        return [
+            new TwigFilter('markdown', [$this, 'render'], $options),
+            new TwigFilter('md', [$this, 'render'], $options),
+        ];
+    }
+
+    /**
+     * @param string $text
+     * @return string
+     */
+    public function render($text): string
+    {
+        return $this->renderer->text(htmlspecialchars($text));
+    }
+}
diff --git a/src/Renderer/TwigServiceProvider.php b/src/Renderer/TwigServiceProvider.php
index d7b6bd09..6cd885fd 100644
--- a/src/Renderer/TwigServiceProvider.php
+++ b/src/Renderer/TwigServiceProvider.php
@@ -10,6 +10,7 @@ use Engelsystem\Renderer\Twig\Extensions\Config;
 use Engelsystem\Renderer\Twig\Extensions\Csrf;
 use Engelsystem\Renderer\Twig\Extensions\Globals;
 use Engelsystem\Renderer\Twig\Extensions\Legacy;
+use Engelsystem\Renderer\Twig\Extensions\Markdown;
 use Engelsystem\Renderer\Twig\Extensions\Session;
 use Engelsystem\Renderer\Twig\Extensions\Translation;
 use Engelsystem\Renderer\Twig\Extensions\Url;
@@ -28,6 +29,7 @@ class TwigServiceProvider extends ServiceProvider
         'globals'        => Globals::class,
         'session'        => Session::class,
         'legacy'         => Legacy::class,
+        'markdown'       => Markdown::class,
         'translation'    => Translation::class,
         'url'            => Url::class,
     ];
diff --git a/tests/Unit/Renderer/Twig/Extensions/MarkdownTest.php b/tests/Unit/Renderer/Twig/Extensions/MarkdownTest.php
new file mode 100644
index 00000000..fd98c7cd
--- /dev/null
+++ b/tests/Unit/Renderer/Twig/Extensions/MarkdownTest.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace Engelsystem\Test\Unit\Renderer\Twig\Extensions;
+
+use Engelsystem\Renderer\Twig\Extensions\Markdown;
+use Parsedown;
+use PHPUnit\Framework\MockObject\MockObject;
+
+class MarkdownTest extends ExtensionTest
+{
+    /**
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Markdown::getFilters
+     */
+    public function testGeFilters()
+    {
+        /** @var Parsedown|MockObject $renderer */
+        $renderer = $this->createMock(Parsedown::class);
+
+        $extension = new Markdown($renderer);
+        $filters = $extension->getFilters();
+
+        $this->assertExtensionExists('markdown', [$extension, 'render'], $filters);
+        $this->assertExtensionExists('md', [$extension, 'render'], $filters);
+    }
+
+    /**
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Markdown::__construct
+     * @covers \Engelsystem\Renderer\Twig\Extensions\Markdown::render
+     */
+    public function testRender()
+    {
+        /** @var Parsedown|MockObject $renderer */
+        $renderer = $this->createMock(Parsedown::class);
+
+        $return = '<p>Lorem <em>&quot;Ipsum&quot;</em></p>';
+        $renderer->expects($this->once())
+            ->method('text')
+            ->with('Lorem *&quot;Ipsum&quot;*')
+            ->willReturn($return);
+
+        $extension = new Markdown($renderer);
+        $this->assertEquals($return, $extension->render('Lorem *"Ipsum"*'));
+    }
+}