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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\Validator\ValidationContext;
class NoUnusedVariables extends AbstractValidationRule
{
static function unusedVariableMessage($varName, $opName = null)
{
return $opName
? "Variable \"$$varName\" is never used in operation \"$opName\"."
: "Variable \"$$varName\" is never used.";
}
public $variableDefs;
public function getVisitor(ValidationContext $context)
{
$this->variableDefs = [];
return [
NodeKind::OPERATION_DEFINITION => [
'enter' => function() {
$this->variableDefs = [];
},
'leave' => function(OperationDefinitionNode $operation) use ($context) {
$variableNameUsed = [];
$usages = $context->getRecursiveVariableUsages($operation);
$opName = $operation->name ? $operation->name->value : null;
foreach ($usages as $usage) {
$node = $usage['node'];
$variableNameUsed[$node->name->value] = true;
}
foreach ($this->variableDefs as $variableDef) {
$variableName = $variableDef->variable->name->value;
if (empty($variableNameUsed[$variableName])) {
$context->reportError(new Error(
self::unusedVariableMessage($variableName, $opName),
[$variableDef]
));
}
}
}
],
NodeKind::VARIABLE_DEFINITION => function($def) {
$this->variableDefs[] = $def;
}
];
}
}