Allow code in-lining instead of everything

Create snip content parser

src/Service/SnipParser/Pipeline.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Service\SnipParser;
+
+use App\Service\SnipParser\Stages\HtmlEscapeStage;
+use App\Service\SnipParser\Stages\ReplaceBlocksStage;
+use League\Pipeline\PipelineBuilder;
+
+class Pipeline
+{
+    public function parse(string $payload): string
+    {
+        $builder = new PipelineBuilder();
+        $pipeline = $builder
+            ->add(new HtmlEscapeStage())
+            ->add(new ReplaceBlocksStage('<pre><code>', '</code></pre>', '```'))
+            ->build();
+
+        return $pipeline->process($payload);
+    }
+}

src/Service/SnipParser/Stages/HtmlEscapeStage.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Service\SnipParser\Stages;
+
+use League\Pipeline\StageInterface;
+
+class HtmlEscapeStage implements StageInterface
+{
+    public function __invoke(mixed $payload): string
+    {
+        return htmlspecialchars($payload, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
+    }
+}

src/Service/SnipParser/Stages/ReplaceBlocksStage.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Service\SnipParser\Stages;
+
+use InvalidArgumentException;
+use League\Pipeline\StageInterface;
+
+class ReplaceBlocksStage implements StageInterface
+{
+    public function __construct(
+        public readonly string $openTag = '<pre><code>',
+        public readonly string $closeTag = '</code></pre>',
+        public readonly string $delimiter = '```'
+    ) {}
+
+    public function __invoke(mixed $payload): string
+    {
+        if (!is_string($payload)) {
+            throw new InvalidArgumentException('The payload must be a string.');
+        }
+
+        return $this->replaceCodeBlocks($payload);
+    }
+
+    private function replaceCodeBlocks(string $text): string
+    {
+        $pattern = sprintf('/%s(.+?)%s/s', preg_quote($this->delimiter), preg_quote($this->delimiter));
+
+        return preg_replace_callback($pattern, function ($matches) {
+            return $this->openTag . trim($matches[1]) . $this->closeTag;
+        }, $text);
+    }
+}