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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\Backend\Linker; |
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use GraphQL\Contracts\TypeSystem\Type\NamedTypeInterface; |
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use Phplrt\Contracts\Ast\NodeInterface; |
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use Phplrt\Source\Exception\NotAccessibleException; |
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use Phplrt\Visitor\Visitor; |
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use Railt\SDL\Backend\Context; |
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use Railt\SDL\Backend\Context\CompiledTypeContext; |
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use Railt\SDL\Exception\TypeNotFoundException; |
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use Railt\SDL\Frontend\Ast\Executable\DirectiveNode; |
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use Railt\SDL\Frontend\Ast\Type\NamedDirectiveNode; |
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use Railt\SDL\Frontend\Ast\Type\NamedTypeNode; |
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/** |
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* Class LinkerVisitor |
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*/ |
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class LinkerVisitor extends Visitor |
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{ |
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/** |
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* @var string |
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*/ |
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private const ERROR_TYPE_NOT_FOUND = 'Type "%s" not found or could not be loaded'; |
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/** |
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* @var string |
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*/ |
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private const ERROR_DIRECTIVE_NOT_FOUND = 'Directive "@%s" not found or could not be loaded'; |
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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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* LinkerVisitor constructor. |
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* |
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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(Context $context, LinkerInterface $linker) |
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{ |
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$this->context = $context; |
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$this->linker = $linker; |
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} |
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/** |
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* @param NodeInterface $node |
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* @return mixed|void|null |
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*/ |
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public function leave(NodeInterface $node) |
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{ |
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if ($node instanceof NamedTypeNode) { |
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$this->assertTypeExists($node); |
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} |
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if ($node instanceof DirectiveNode) { |
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$this->assertDirectiveExists($node->name); |
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} |
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} |
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/** |
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* @param NamedTypeNode $name |
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* @return void |
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*/ |
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private function assertTypeExists(NamedTypeNode $name): void |
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{ |
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$context = $this->context->getType($name->name->value); |
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if ($context === null) { |
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$this->loadOr($name->name->value, function () use ($name): void { |
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throw $this->typeNotFound($name); |
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}); |
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} |
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} |
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/** |
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* @param string $type |
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* @param \Closure $otherwise |
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* @return void |
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*/ |
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private function loadOr(string $type, \Closure $otherwise): void |
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{ |
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foreach ($this->linker->getAutoloaders() as $autoloader) { |
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$result = $autoloader($type); |
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switch (true) { |
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case $result instanceof NamedTypeInterface: |
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$this->context->addType(new CompiledTypeContext($result)); |
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return; |
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} |
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} |
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$otherwise(); |
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} |
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/** |
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* @param NamedTypeNode $name |
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* @return TypeNotFoundException |
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* @throws NotAccessibleException |
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* @throws \RuntimeException |
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*/ |
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private function typeNotFound(NamedTypeNode $name): TypeNotFoundException |
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{ |
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$error = \sprintf(self::ERROR_TYPE_NOT_FOUND, $name->name->value); |
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return new TypeNotFoundException($error, $name); |
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} |
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/** |
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* @param NamedDirectiveNode $name |
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* @return void |
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*/ |
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private function assertDirectiveExists(NamedDirectiveNode $name): void |
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{ |
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$context = $this->context->getDirective($name->name->value); |
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if ($context === null) { |
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$this->loadOr('@' . $name->name->value, function () use ($name): void { |
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throw $this->directiveNotFound($name); |
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}); |
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} |
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} |
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/** |
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* @param NamedDirectiveNode $name |
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* @return TypeNotFoundException |
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* @throws NotAccessibleException |
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* @throws \RuntimeException |
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*/ |
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private function directiveNotFound(NamedDirectiveNode $name): TypeNotFoundException |
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{ |
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$error = \sprintf(self::ERROR_DIRECTIVE_NOT_FOUND, $name->name->value); |
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return new TypeNotFoundException($error, $name); |
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} |
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} |
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railt /
sdl
