GraphQL\Validator\Rules\AbstractQuerySecurity::collectFieldASTsAndDefs PHP Method

    protected function collectFieldASTsAndDefs(ValidationContext $context, $parentType, SelectionSetNode $selectionSet, \ArrayObject $visitedFragmentNames = null, \ArrayObject $astAndDefs = null)
    {
        $_visitedFragmentNames = $visitedFragmentNames ?: new \ArrayObject();
        $_astAndDefs = $astAndDefs ?: new \ArrayObject();
        foreach ($selectionSet->selections as $selection) {
            switch ($selection->kind) {
                case NodeKind::FIELD:
                    /* @var FieldNode $selection */
                    $fieldName = $selection->name->value;
                    $fieldDef = null;
                    if ($parentType && method_exists($parentType, 'getFields')) {
                        $tmp = $parentType->getFields();
                        $schemaMetaFieldDef = Introspection::schemaMetaFieldDef();
                        $typeMetaFieldDef = Introspection::typeMetaFieldDef();
                        $typeNameMetaFieldDef = Introspection::typeNameMetaFieldDef();
                        if ($fieldName === $schemaMetaFieldDef->name && $context->getSchema()->getQueryType() === $parentType) {
                            $fieldDef = $schemaMetaFieldDef;
                        } elseif ($fieldName === $typeMetaFieldDef->name && $context->getSchema()->getQueryType() === $parentType) {
                            $fieldDef = $typeMetaFieldDef;
                        } elseif ($fieldName === $typeNameMetaFieldDef->name) {
                            $fieldDef = $typeNameMetaFieldDef;
                        } elseif (isset($tmp[$fieldName])) {
                            $fieldDef = $tmp[$fieldName];
                        }
                    }
                    $responseName = $this->getFieldName($selection);
                    if (!isset($_astAndDefs[$responseName])) {
                        $_astAndDefs[$responseName] = new \ArrayObject();
                    }
                    // create field context
                    $_astAndDefs[$responseName][] = [$selection, $fieldDef];
                    break;
                case NodeKind::INLINE_FRAGMENT:
                    /* @var InlineFragmentNode $selection */
                    $_astAndDefs = $this->collectFieldASTsAndDefs($context, TypeInfo::typeFromAST($context->getSchema(), $selection->typeCondition), $selection->selectionSet, $_visitedFragmentNames, $_astAndDefs);
                    break;
                case NodeKind::FRAGMENT_SPREAD:
                    /* @var FragmentSpreadNode $selection */
                    $fragName = $selection->name->value;
                    if (empty($_visitedFragmentNames[$fragName])) {
                        $_visitedFragmentNames[$fragName] = true;
                        $fragment = $context->getFragment($fragName);
                        if ($fragment) {
                            $_astAndDefs = $this->collectFieldASTsAndDefs($context, TypeInfo::typeFromAST($context->getSchema(), $fragment->typeCondition), $fragment->selectionSet, $_visitedFragmentNames, $_astAndDefs);
                        }
                    }
                    break;
            }
        }
        return $_astAndDefs;
    }