From 9b64af120d24e1620c528e0a04fc434a2ea39943 Mon Sep 17 00:00:00 2001
From: TJ Miller <sixlive@users.noreply.github.com>
Date: Wed, 20 May 2020 11:01:26 -0400
Subject: [PATCH] Adds support for parsedown extra (#10)

---
 README.md                             | 10 +++++++
 composer.json                         |  3 +-
 src/ParsedownHighlightExtra.php       | 42 +++++++++++++++++++++++++++
 tests/ParsedownExtraHighlightTest.php | 29 ++++++++++++++++++
 4 files changed, 83 insertions(+), 1 deletion(-)
 create mode 100644 src/ParsedownHighlightExtra.php
 create mode 100644 tests/ParsedownExtraHighlightTest.php

diff --git a/README.md b/README.md
index 35c288b..e7c16de 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,16 @@ $parsedown->text(file_get_contents(__DIR__.'/README.md'));
 <pre><code class="language-asldfh">put 'WHOOP!'</code></pre>
 ```
 
+### Using Parsedown Extra
+**Note: This requires version [0.8.0-beta-1](https://github.com/erusev/parsedown-extra/releases/tag/0.8.0-beta-1)**
+
+```php
+$parsedown = new \sixlive\ParsedownHighlightExtra;
+
+$parsedown->text(file_get_contents(__DIR__.'/README.md'));
+```
+
+
 ## Testing
 
 ``` bash
diff --git a/composer.json b/composer.json
index b1f47db..75150a8 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,8 @@
     "require": {
         "php": "^7.1|7.2",
         "erusev/parsedown": "1.8.0-beta-5",
-        "scrivo/highlight.php": "^9.14"
+        "scrivo/highlight.php": "^9.14",
+        "erusev/parsedown-extra": "0.8.0-beta-1"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^2.10",
diff --git a/src/ParsedownHighlightExtra.php b/src/ParsedownHighlightExtra.php
new file mode 100644
index 0000000..5b46d46
--- /dev/null
+++ b/src/ParsedownHighlightExtra.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace sixlive;
+
+use ParsedownExtra;
+use DomainException;
+use Highlight\Highlighter;
+
+class ParsedownHighlightExtra extends ParsedownExtra
+{
+    protected $highlighter;
+
+    public function __construct()
+    {
+        $this->highlighter = new Highlighter;
+    }
+
+    protected function blockFencedCodeComplete($block)
+    {
+        if (! isset($block['element']['element']['attributes'])) {
+            return $block;
+        }
+
+        $code = $block['element']['element']['text'];
+        $languageClass = $block['element']['element']['attributes']['class'];
+        $language = explode('-', $languageClass);
+
+        try {
+            $highlighted = $this->highlighter->highlight($language[1], $code);
+            $block['element']['element']['attributes']['class'] = vsprintf('%s hljs %s', [
+                $languageClass,
+                $highlighted->language,
+            ]);
+            $block['element']['element']['rawHtml'] = $highlighted->value;
+            unset($block['element']['element']['text']);
+        } catch (DomainException $e) {
+            //
+        }
+
+        return $block;
+    }
+}
diff --git a/tests/ParsedownExtraHighlightTest.php b/tests/ParsedownExtraHighlightTest.php
new file mode 100644
index 0000000..175c765
--- /dev/null
+++ b/tests/ParsedownExtraHighlightTest.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Tests;
+
+use PHPUnit\Framework\TestCase;
+use sixlive\ParsedownHighlightExtra;
+
+class ParsedownExtraHighlightTest extends TestCase
+{
+    /** @test */
+    public function code_is_rendered()
+    {
+        $parsedown = new ParsedownHighlightExtra;
+
+        $renderedMarkdown = $parsedown->text(file_get_contents(__DIR__.'/Support/test.md'));
+
+        $this->assertContains("<pre><code class=\"language-php hljs php\"><span class=\"hljs-meta\">&lt;?php</span>\n\n<span class=\"hljs-keyword\">echo</span> <span class=\"hljs-string\">'foo'</span>;</code></pre>", $renderedMarkdown);
+    }
+
+    /** @test */
+    public function language_errors_are_swallowd()
+    {
+        $parsedown = new ParsedownHighlightExtra;
+
+        $renderedMarkdown = $parsedown->text(file_get_contents(__DIR__.'/Support/test.md'));
+
+        $this->assertContains("<pre><code class=\"language-asldfh\">put 'WHOOP!'</code></pre>", $renderedMarkdown);
+    }
+}