Youshido\GraphQL\Execution\Processor::prepareArgumentValue PHP Method

    private function prepareArgumentValue($argumentValue, AbstractType $argumentType, Request $request)
    {
        switch ($argumentType->getKind()) {
            case TypeMap::KIND_LIST:
                /** @var $argumentType AbstractListType */
                $result = [];
                if ($argumentValue instanceof AstInputList || is_array($argumentValue)) {
                    $list = is_array($argumentValue) ? $argumentValue : $argumentValue->getValue();
                    foreach ($list as $item) {
                        $result[] = $this->prepareArgumentValue($item, $argumentType->getItemType()->getNullableType(), $request);
                    }
                } else {
                    if ($argumentValue instanceof VariableReference) {
                        return $this->getVariableReferenceArgumentValue($argumentValue, $argumentType, $request);
                    }
                }
                return $result;
            case TypeMap::KIND_INPUT_OBJECT:
                /** @var $argumentType AbstractInputObjectType */
                $result = [];
                if ($argumentValue instanceof AstInputObject) {
                    foreach ($argumentType->getFields() as $field) {
                        /** @var $field Field */
                        if ($field->getConfig()->has('default')) {
                            $result[$field->getName()] = $field->getConfig()->get('default');
                        }
                    }
                    foreach ($argumentValue->getValue() as $key => $item) {
                        if ($argumentType->hasField($key)) {
                            $result[$key] = $this->prepareArgumentValue($item, $argumentType->getField($key)->getType()->getNullableType(), $request);
                        } else {
                            $result[$key] = $item;
                        }
                    }
                } else {
                    if ($argumentValue instanceof VariableReference) {
                        return $this->getVariableReferenceArgumentValue($argumentValue, $argumentType, $request);
                    }
                }
                return $result;
            case TypeMap::KIND_SCALAR:
            case TypeMap::KIND_ENUM:
                /** @var $argumentValue AstLiteral|VariableReference */
                if ($argumentValue instanceof VariableReference) {
                    return $this->getVariableReferenceArgumentValue($argumentValue, $argumentType, $request);
                } else {
                    if ($argumentValue instanceof AstLiteral) {
                        return $argumentValue->getValue();
                    } else {
                        return $argumentValue;
                    }
                }
        }
        throw new ResolveException('Argument type not supported');
    }