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<?php declare(strict_types=1); namespace YOOtheme\GraphQL\Validator\Rules; use YOOtheme\GraphQL\Error\Error; use YOOtheme\GraphQL\Language\AST\NameNode; use YOOtheme\GraphQL\Language\AST\NodeKind; use YOOtheme\GraphQL\Language\AST\VariableDefinitionNode; use YOOtheme\GraphQL\Validator\QueryValidationContext; class UniqueVariableNames extends ValidationRule { /** @var array<string, NameNode> */ protected array $knownVariableNames; public function getVisitor(QueryValidationContext $context): array { $this->knownVariableNames = []; return [ NodeKind::OPERATION_DEFINITION => function (): void { $this->knownVariableNames = []; }, NodeKind::VARIABLE_DEFINITION => function (VariableDefinitionNode $node) use ($context): void { $variableName = $node->variable->name->value; if (! isset($this->knownVariableNames[$variableName])) { $this->knownVariableNames[$variableName] = $node->variable->name; } else { $context->reportError(new Error( static::duplicateVariableMessage($variableName), [$this->knownVariableNames[$variableName], $node->variable->name] )); } }, ]; } public static function duplicateVariableMessage(string $variableName): string { return "There can be only one variable named \"{$variableName}\"."; } }
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