<?php namespace GraphQL\Validator\Rules; use GraphQL\Error\Error; use GraphQL\Language\AST\NodeKind; use GraphQL\Language\AST\OperationDefinitionNode; use GraphQL\Language\AST\VariableDefinitionNode; use GraphQL\Validator\ValidationContext; /** * Class NoUndefinedVariables * * A GraphQL operation is only valid if all variables encountered, both directly * and via fragment spreads, are defined by that operation. * * @package GraphQL\Validator\Rules */ class NoUndefinedVariables extends AbstractValidationRule { static function undefinedVarMessage($varName, $opName = null) { return $opName ? "Variable \"$$varName\" is not defined by operation \"$opName\"." : "Variable \"$$varName\" is not defined."; } public function getVisitor(ValidationContext $context) { $variableNameDefined = []; return [ NodeKind::OPERATION_DEFINITION => [ 'enter' => function() use (&$variableNameDefined) { $variableNameDefined = []; }, 'leave' => function(OperationDefinitionNode $operation) use (&$variableNameDefined, $context) { $usages = $context->getRecursiveVariableUsages($operation); foreach ($usages as $usage) { $node = $usage['node']; $varName = $node->name->value; if (empty($variableNameDefined[$varName])) { $context->reportError(new Error( self::undefinedVarMessage( $varName, $operation->name ? $operation->name->value : null ), [ $node, $operation ] )); } } } ], NodeKind::VARIABLE_DEFINITION => function(VariableDefinitionNode $def) use (&$variableNameDefined) { $variableNameDefined[$def->variable->name->value] = true; } ]; } }