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;
+    }
+}