Adds support for parsedown extra (sixlive#10)

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

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",

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;
+    }
+}

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);
+    }
+}