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<?php declare(strict_types=1); namespace YOOtheme\GraphQL\Validator\Rules; use YOOtheme\GraphQL\Error\Error; use YOOtheme\GraphQL\Language\AST\NodeKind; use YOOtheme\GraphQL\Language\AST\OperationDefinitionNode; use YOOtheme\GraphQL\Language\AST\VariableDefinitionNode; use YOOtheme\GraphQL\Validator\QueryValidationContext; class NoUnusedVariables extends ValidationRule { /** @var array<int, VariableDefinitionNode> */ protected array $variableDefs; public function getVisitor(QueryValidationContext $context): array { $this->variableDefs = []; return [ NodeKind::OPERATION_DEFINITION => [ 'enter' => function (): void { $this->variableDefs = []; }, 'leave' => function (OperationDefinitionNode $operation) use ($context): void { $variableNameUsed = []; $usages = $context->getRecursiveVariableUsages($operation); $opName = $operation->name !== null ? $operation->name->value : null; foreach ($usages as $usage) { $node = $usage['node']; $variableNameUsed[$node->name->value] = true; } foreach ($this->variableDefs as $variableDef) { $variableName = $variableDef->variable->name->value; if (! isset($variableNameUsed[$variableName])) { $context->reportError(new Error( static::unusedVariableMessage($variableName, $opName), [$variableDef] )); } } }, ], NodeKind::VARIABLE_DEFINITION => function ($def): void { $this->variableDefs[] = $def; }, ]; } public static function unusedVariableMessage(string $varName, ?string $opName = null): string { return $opName !== null ? "Variable \"\${$varName}\" is never used in operation \"{$opName}\"." : "Variable \"\${$varName}\" is never used."; } }
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