GraphQL\Validator\ValidationContext::getDocument PHP Method

    function getDocument()
    {
        return $this->ast;
    }

 public function __invoke(ValidationContext $context)
 {
     // Gather all the fragment spreads ASTs for each fragment definition.
     // Importantly this does not include inline fragments.
     $definitions = $context->getDocument()->definitions;
     $spreadsInFragment = [];
     foreach ($definitions as $node) {
         if ($node instanceof FragmentDefinition) {
             $spreadsInFragment[$node->name->value] = $this->gatherSpreads($node);
         }
     }
     // Tracks spreads known to lead to cycles to ensure that cycles are not
     // redundantly reported.
     $knownToLeadToCycle = new \SplObjectStorage();
     return [Node::FRAGMENT_DEFINITION => function (FragmentDefinition $node) use($spreadsInFragment, $knownToLeadToCycle) {
         $errors = [];
         $initialName = $node->name->value;
         // Array of AST nodes used to produce meaningful errors
         $spreadPath = [];
         $this->detectCycleRecursive($initialName, $spreadsInFragment, $knownToLeadToCycle, $initialName, $spreadPath, $errors);
         if (!empty($errors)) {
             return $errors;
         }
     }];
 }