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<?php
namespace Digia\GraphQL\Language;
use Digia\GraphQL\Error\LanguageException;
use Digia\GraphQL\Language\AST\Node\NodeInterface;
use Digia\GraphQL\Language\Writer\WriterInterface;
class Printer implements PrinterInterface
{
/**
* @var array|WriterInterface[]
*/
protected $writers;
* Printer constructor.
* @param array|WriterInterface[] $writers
public function __construct(array $writers)
foreach ($writers as $writer) {
$writer->setPrinter($this);
}
$this->writers = $writers;
* @inheritdoc
* @throws LanguageException
public function print(NodeInterface $node): string
if (($writer = $this->getWriter($node)) !== null) {
return $writer->write($node);
throw new LanguageException(sprintf('Invalid AST Node: %s', (string)$node));
* @param NodeInterface $node
* @return WriterInterface|null
protected function getWriter(NodeInterface $node): ?WriterInterface
foreach ($this->writers as $writer) {
if ($writer instanceof WriterInterface && $writer->supportsWriter($node)) {
return $writer;
return null;
digiaonline /
graphql-php
