Implement snip loader for twig, allowing extends and includes

src/Service/SnipParser/Twig/SnipLoader.php

@@ -0,0 +1,56 @@
+<?php
+
+namespace App\Service\SnipParser\Twig;
+
+use App\Entity\Snip;
+use App\Repository\SnipRepository;
+use App\Service\SnipContent\SnipContentService;
+use Twig\Error\LoaderError;
+use Twig\Loader\LoaderInterface;
+use Twig\Source;
+
+class SnipLoader implements LoaderInterface
+{
+    public function __construct(
+        private readonly SnipRepository     $repository,
+        private readonly SnipContentService $contentService,
+    ) {}
+
+    public function getSourceContext(string $name): Source
+    {
+        return new Source($this->contentService->getActiveText($this->getFromKey($name)), $name);
+    }
+
+    public function getCacheKey(string $name): string
+    {
+        return $this->getFromKey($name)->getActiveVersion()->getId();
+    }
+
+    public function isFresh(string $name, int $time): bool
+    {
+        $this->getFromKey($name);
+
+        return true;
+    }
+
+    public function exists(string $name)
+    {
+        try {
+            $this->getFromKey($name);
+        } catch (LoaderError) {
+            return false;
+        }
+
+        return true;
+    }
+
+    private function getFromKey(string $key): Snip
+    {
+        $snip = $this->repository->find($key);
+        if (!$snip) {
+            throw new LoaderError(\sprintf('Template "%s" is not defined.', $key));
+        }
+
+        return $snip;
+    }
+}

src/Service/SnipParser/Twig/TwigParser.php

@@ -5,9 +5,14 @@ namespace App\Service\SnipParser\Twig;
 use App\Service\SnipParser\AbstractParser;
 use Twig\Environment;
 use Twig\Loader\ArrayLoader;
+use Twig\Loader\ChainLoader;
 
 class TwigParser extends AbstractParser
 {
+    public function __construct(
+        private readonly SnipLoader $snipLoader,
+    ) {}
+
     public static function getName(): string
     {
         return 'twig';
@@ -16,12 +21,15 @@ class TwigParser extends AbstractParser
     public function parseView(string $content): string
     {
         try {
-            $arrayLoader = new ArrayLoader([
+            $loader = new ChainLoader([
+                new ArrayLoader([
                     'index' => $content,
+                ]),
+                $this->snipLoader,
             ]);
-            $twig = new Environment($arrayLoader);
+            $twig = new Environment($loader);
             return $twig->render('index');
-        }catch (\Exception $exception) {
+        } catch (\Exception $exception) {
             return sprintf('<pre><code class="hljs">%s</code></pre>', htmlspecialchars($exception->getMessage()));
         }
     }