fix code block

Author: nikophil

_build/src/KernelFactory.php

@@ -17,6 +17,7 @@ public static function createKernel(): Kernel
         $configuration = new Configuration();
         $configuration->setCustomTemplateDirs([__DIR__.'/Templates']);
         $configuration->setCacheDir(__DIR__.'/../var/cache');
+        $configuration->addFormat(new SymfonyFormat($configuration->getTemplateRenderer()));
 
         return new Kernel(
             $configuration,

_build/src/Nodes/CodeNode.php renamed to _build/src/Nodes/SfCodeNode.php

@@ -5,7 +5,7 @@
 use Doctrine\RST\Nodes\CodeNode as Base;
 use Highlight\Highlighter;
 
-class CodeNode extends Base
+class SfCodeNode extends Base
 {
     private const LANGUAGES_MAPPING = [
         'php'             => 'php',

_build/src/Renderers/CodeNodeRenderer.php

@@ -0,0 +1,89 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SymfonyDocs\Renderers;
+
+use Doctrine\RST\Nodes\CodeNode;
+use Doctrine\RST\Renderers\NodeRenderer;
+use Doctrine\RST\Templates\TemplateRenderer;
+use Highlight\Highlighter;
+
+class CodeNodeRenderer implements NodeRenderer
+{
+    private const LANGUAGES_MAPPING = [
+        'html+twig'       => 'twig',
+        'jinja'           => 'twig',
+        'html+php'        => 'html',
+        'php-annotations' => 'php',
+        'terminal'        => 'bash',
+        'rst'             => 'markdown',
+        'php-standalone'  => 'php',
+        'php-symfony'     => 'php',
+        'varnish4'        => 'c',
+        'varnish3'        => 'c',
+    ];
+
+    /** @var CodeNode */
+    private $codeNode;
+
+    /** @var TemplateRenderer */
+    private $templateRenderer;
+
+    public function __construct(CodeNode $codeNode, TemplateRenderer $templateRenderer)
+    {
+        $this->codeNode         = $codeNode;
+        $this->templateRenderer = $templateRenderer;
+    }
+
+    public function render(): string
+    {
+        $value = $this->codeNode->getValue();
+
+        if ($this->codeNode->isRaw()) {
+            return $value;
+        }
+
+        $lines = $this->getLines($value);
+        $code  = implode("\n", $lines);
+
+        $lineNumbers = "";
+        for ($i = 1; $i <= \count($lines); $i++) {
+            $lineNumbers .= str_pad((string) $i, 2, ' ', STR_PAD_LEFT)."\n";
+        }
+
+        $language = $this->codeNode->getLanguage() ?? 'php';
+
+        if ('text' !== $language) {
+            $highLighter = new Highlighter();
+            $code        = $highLighter->highlight(self::LANGUAGES_MAPPING[$language] ?? $language, $code)->value;
+        }
+
+        return $this->templateRenderer->render(
+            'code.html.twig',
+            [
+                'language'        => $language,
+                'languageMapping' => self::LANGUAGES_MAPPING[$language] ?? $language,
+                'code'            => $code,
+                'lineNumbers'     => rtrim($lineNumbers),
+            ]
+        );
+    }
+
+    private function getLines(string $code): array
+    {
+        $lines         = preg_split('/\r\n|\r|\n/', $code);
+        $reversedLines = array_reverse($lines);
+
+        // trim empty lines at the end of the code
+        foreach ($reversedLines as $key => $line) {
+            if (trim($line) !== '') {
+                break;
+            }
+
+            unset($reversedLines[$key]);
+        }
+
+        return array_reverse($reversedLines);
+    }
+}

_build/src/SymfonyFormat.php

@@ -0,0 +1,43 @@
+<?php declare(strict_types=1);
+
+namespace SymfonyDocs;
+
+use Doctrine\RST\HTML\HTMLFormat;
+use Doctrine\RST\Nodes\CodeNode;
+use Doctrine\RST\Renderers\CallableNodeRendererFactory;
+use Doctrine\RST\Renderers\NodeRendererFactory;
+use Doctrine\RST\Templates\TemplateRenderer;
+
+/**
+ * Class SymfonyFormat
+ */
+final class SymfonyFormat extends HTMLFormat
+{
+    /** @var TemplateRenderer */
+    protected $templateRenderer;
+
+    public function __construct(TemplateRenderer $templateRenderer)
+    {
+        parent::__construct($templateRenderer);
+        $this->templateRenderer = $templateRenderer;
+    }
+
+    /**
+     * @return NodeRendererFactory[]
+     */
+    public function getNodeRendererFactories(): array
+    {
+        $nodeRendererFactories =  parent::getNodeRendererFactories();
+
+        $nodeRendererFactories[CodeNode::class] = new CallableNodeRendererFactory(
+            function (CodeNode $node) {
+                return new Renderers\CodeNodeRenderer(
+                    $node,
+                    $this->templateRenderer
+                );
+            }
+        );
+
+        return $nodeRendererFactories;
+    }
+}

_build/src/Templates/default/html/code.html.twig

@@ -0,0 +1,19 @@
+<div class="literal-block notranslate">
+    <div class="highlight-{{ language }}">
+        <table class="highlighttable">
+            <tr>
+                <td class="linenos">
+                    <div class="linenodiv">
+                        <pre>{{ lineNumbers }}</pre>
+                    </div>
+                </td>
+                <td class="code">
+                    <div class="highlight">
+                        <pre class="hljs {{ languageMapping }}">{{ code|raw }}</pre>
+                    </div>
+                </td>
+            </tr>
+        </table>
+    </div>
+</div>
+