refactor: simplify transformers implementation by adding specific Platform (#314)

Similar to #312

Author: chr-hertel

src/Bridge/TransformersPHP/Handler.php

@@ -0,0 +1,42 @@
+<?php
+
+declare(strict_types=1);
+
+namespace PhpLlm\LlmChain\Bridge\TransformersPHP;
+
+use Codewithkyrian\Transformers\Pipelines\Task;
+use PhpLlm\LlmChain\Exception\InvalidArgumentException;
+use PhpLlm\LlmChain\Model\Model;
+use PhpLlm\LlmChain\Model\Response\ResponseInterface;
+use PhpLlm\LlmChain\Model\Response\StructuredResponse;
+use PhpLlm\LlmChain\Model\Response\TextResponse;
+use PhpLlm\LlmChain\PlatformInterface;
+
+use function Codewithkyrian\Transformers\Pipelines\pipeline;
+
+final class Platform implements PlatformInterface
+{
+    public function request(Model $model, object|array|string $input, array $options = []): ResponseInterface
+    {
+        if (null === $task = $options['task'] ?? null) {
+            throw new InvalidArgumentException('The task option is required.');
+        }
+
+        $pipeline = pipeline(
+            $options['task'],
+            $model->getName(),
+            $options['quantized'] ?? true,
+            $options['config'] ?? null,
+            $options['cacheDir'] ?? null,
+            $options['revision'] ?? 'main',
+            $options['modelFilename'] ?? null,
+        );
+
+        $data = $pipeline($input);
+
+        return match ($task) {
+            Task::Text2TextGeneration => new TextResponse($data[0]['generated_text']),
+            default => new StructuredResponse($data),
+        };
+    }
+}

src/Bridge/TransformersPHP/PipelineResponse.php

@@ -6,7 +6,6 @@
 
 use Codewithkyrian\Transformers\Transformers;
 use PhpLlm\LlmChain\Exception\RuntimeException;
-use PhpLlm\LlmChain\Platform;
 
 final readonly class PlatformFactory
 {
@@ -16,6 +15,6 @@ public static function create(): Platform
             throw new RuntimeException('TransformersPHP is not installed. Please install it using "composer require codewithkyrian/transformers".');
         }
 
-        return new Platform([$handler = new Handler()], [$handler]);
+        return new Platform();
     }
 }