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<?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;
}
];
}
}