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<?php |
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/** |
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* This file is part of Railt package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Railt\SDL; |
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use GraphQL\Contracts\TypeSystem\SchemaInterface; |
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use Phplrt\Visitor\Traverser; |
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use Railt\SDL\Backend\Context; |
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use Railt\SDL\Backend\Linker\LinkerInterface; |
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use Railt\SDL\Backend\Linker\LinkerVisitor; |
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use Railt\SDL\Backend\TypeBuilderVisitor; |
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use Railt\SDL\Frontend\Ast\Node; |
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use Railt\SDL\Spec\Executor; |
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use Railt\SDL\Spec\SpecificationInterface; |
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use Railt\TypeSystem\Exception\TypeUniquenessException; |
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use Railt\TypeSystem\Schema; |
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/** |
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* Class Backend |
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*/ |
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class Backend |
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{ |
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/** |
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* @var Executor |
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*/ |
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private Executor $spec; |
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/** |
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* @var Context |
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*/ |
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private Context $context; |
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/** |
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* @var LinkerInterface |
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*/ |
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private LinkerInterface $linker; |
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/** |
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* Backend constructor. |
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* |
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* @param SpecificationInterface $spec |
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* @param Context $context |
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* @param LinkerInterface $linker |
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*/ |
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public function __construct(SpecificationInterface $spec, Context $context, LinkerInterface $linker) |
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{ |
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$this->spec = new Executor($spec); |
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$this->context = $context; |
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$this->linker = $linker; |
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} |
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/** |
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* @param iterable|Node[] $ast |
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* @param array $variables |
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* @return SchemaInterface |
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* @throws \Throwable |
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*/ |
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public function run(iterable $ast, array $variables = []): SchemaInterface |
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{ |
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$schema = new Schema(); |
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$ast = $this->adoptSpecification($ast); |
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$ast = $this->buildTypes($ast, $schema); |
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$this->linkTypes($ast); |
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return $this->moveData($this->context, $schema, $variables); |
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} |
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/** |
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* @param iterable|Node[] $ast |
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* @return iterable|Node[] |
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*/ |
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private function adoptSpecification(iterable $ast): iterable |
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{ |
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return $this->spec->execute($ast); |
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} |
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/** |
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* @param iterable $ast |
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* @param Schema $schema |
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* @return iterable |
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*/ |
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private function buildTypes(iterable $ast, Schema $schema): iterable |
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{ |
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$traverser = new Traverser([ |
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new TypeBuilderVisitor($this->context, $schema), |
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]); |
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return $traverser->traverse($ast); |
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} |
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/** |
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* @param iterable $ast |
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* @return iterable |
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*/ |
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private function linkTypes(iterable $ast): iterable |
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{ |
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$traverser = new Traverser([ |
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new LinkerVisitor($this->context, $this->linker), |
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]); |
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return $traverser->traverse($ast); |
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} |
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/** |
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* @param Context $context |
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* @param Schema $schema |
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* @param array $variables |
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* @return Schema |
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* @throws TypeUniquenessException |
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* @throws \InvalidArgumentException |
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* @throws \Throwable |
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*/ |
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private function moveData(Context $context, Schema $schema, array $variables): Schema |
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{ |
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foreach ($this->context->getTypes() as $type) { |
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$schema->addType($type->resolve($variables)); |
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} |
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foreach ($this->context->getDirectives() as $type) { |
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$schema->addDirective($type->resolve($variables)); |
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} |
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$schema->setQueryType($context->getQuery()); |
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$schema->setMutationType($context->getMutation()); |
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$schema->setSubscriptionType($context->getSubscription()); |
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return $schema; |
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} |
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} |
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railt /
sdl
