public function __invoke(ValidationContext $context)
{
$fragmentDefs = [];
$spreadsWithinOperation = [];
$fragAdjacencies = new \stdClass();
$spreadNames = new \stdClass();
return [Node::OPERATION_DEFINITION => function () use(&$spreadNames, &$spreadsWithinOperation) {
$spreadNames = new \stdClass();
$spreadsWithinOperation[] = $spreadNames;
}, Node::FRAGMENT_DEFINITION => function (FragmentDefinition $def) use(&$fragmentDefs, &$spreadNames, &$fragAdjacencies) {
$fragmentDefs[] = $def;
$spreadNames = new \stdClass();
$fragAdjacencies->{$def->name->value} = $spreadNames;
}, Node::FRAGMENT_SPREAD => function (FragmentSpread $spread) use(&$spreadNames) {
$spreadNames->{$spread->name->value} = true;
}, Node::DOCUMENT => ['leave' => function () use(&$fragAdjacencies, &$spreadsWithinOperation, &$fragmentDefs) {
$fragmentNameUsed = [];
foreach ($spreadsWithinOperation as $spreads) {
$this->reduceSpreadFragments($spreads, $fragmentNameUsed, $fragAdjacencies);
}
$errors = [];
foreach ($fragmentDefs as $def) {
if (empty($fragmentNameUsed[$def->name->value])) {
$errors[] = new Error(Messages::unusedFragMessage($def->name->value), [$def]);
}
}
return !empty($errors) ? $errors : null;
}]];
}
private function unusedFrag($fragName, $line, $column)
{
return new FormattedError(Messages::unusedFragMessage($fragName), [new SourceLocation($line, $column)]);
}
