| 1: | <?php |
| 2: | |
| 3: | declare(strict_types=1); |
| 4: | |
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| 9: | |
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| 12: | |
| 13: | |
| 14: | namespace Nexus\Mcp\Server\Prompt; |
| 15: | |
| 16: | use Nexus\Mcp\Core\Schema\ContentBlock\TextContent; |
| 17: | use Nexus\Mcp\Core\Schema\Enum\Role; |
| 18: | use Nexus\Mcp\Core\Schema\Prompt\PromptMessage; |
| 19: | use Nexus\Mcp\Core\Schema\Result\GetPromptResult; |
| 20: | use Nexus\Mcp\Core\Schema\Result\InputRequiredResult; |
| 21: | use Nexus\Mcp\Server\Discovery\ArgumentBinder; |
| 22: | use Nexus\Mcp\Server\Exception\UnsupportedReturnValueException; |
| 23: | use Nexus\Mcp\Server\ServerContext; |
| 24: | |
| 25: | |
| 26: | |
| 27: | |
| 28: | final readonly class ReflectedPromptRenderer implements PromptRendererInterface |
| 29: | { |
| 30: | public function __construct( |
| 31: | private object $handler, |
| 32: | private \ReflectionMethod $method, |
| 33: | private ArgumentBinder $binder = new ArgumentBinder(), |
| 34: | ) { |
| 35: | } |
| 36: | |
| 37: | #[\Override] |
| 38: | public function render(?array $arguments, ServerContext $context): GetPromptResult|InputRequiredResult |
| 39: | { |
| 40: | $bound = $this->binder->bind($this->method, $arguments ?? [], $context); |
| 41: | |
| 42: | return $this->adapt($this->method->invokeArgs($this->handler, $bound)); |
| 43: | } |
| 44: | |
| 45: | private function adapt(mixed $result): GetPromptResult|InputRequiredResult |
| 46: | { |
| 47: | if ($result instanceof GetPromptResult || $result instanceof InputRequiredResult) { |
| 48: | return $result; |
| 49: | } |
| 50: | |
| 51: | if (\is_string($result)) { |
| 52: | return new GetPromptResult(messages: [ |
| 53: | new PromptMessage(role: Role::User, content: new TextContent(text: $result)), |
| 54: | ]); |
| 55: | } |
| 56: | |
| 57: | if ($result instanceof PromptMessage) { |
| 58: | return new GetPromptResult(messages: [$result]); |
| 59: | } |
| 60: | |
| 61: | if (\is_array($result)) { |
| 62: | return new GetPromptResult(messages: $this->buildMessageList($result)); |
| 63: | } |
| 64: | |
| 65: | throw $this->buildUnsupportedError($this->method, $result); |
| 66: | } |
| 67: | |
| 68: | |
| 69: | |
| 70: | |
| 71: | |
| 72: | |
| 73: | private function buildMessageList(array $result): array |
| 74: | { |
| 75: | $messages = array_filter($result, static fn(mixed $item): bool => $item instanceof PromptMessage); |
| 76: | |
| 77: | if (! array_is_list($result) || [] === $result || \count($messages) !== \count($result)) { |
| 78: | throw $this->buildUnsupportedError($this->method, $result); |
| 79: | } |
| 80: | |
| 81: | return array_values($messages); |
| 82: | } |
| 83: | |
| 84: | private function buildUnsupportedError(\ReflectionMethod $method, mixed $result): UnsupportedReturnValueException |
| 85: | { |
| 86: | return new UnsupportedReturnValueException( |
| 87: | $method->getDeclaringClass()->getName(), |
| 88: | $method->getName(), |
| 89: | \sprintf('a %s, a string, or prompt messages', GetPromptResult::class), |
| 90: | $result, |
| 91: | ); |
| 92: | } |
| 93: | } |
| 94: | |