phpmyadmin / sql-parser

            } elseif ($state === 3) {

                $expr->options = OptionsArray::parse($parser, $list, static::$FIELD_OPTIONS);

                $state = 4;

            } elseif ($state === 4) {

                if (($token->type === Token::TYPE_KEYWORD) && ($token->value === 'REFERENCES')) {

                    ++$list->idx; // Skipping keyword 'REFERENCES'.

                    $expr->references = Reference::parse($parser, $list);

                } else {

                    --$list->idx;

                }

                $state = 5;

            } elseif ($state === 5) {

                if ((!empty($expr->type)) || (!empty($expr->key))) {

                    $ret[] = $expr;

                }

                continue;

            }

            if ($state === 0) {

                $ret->name = $token->value;

                $state = 1;

            } elseif ($state === 1) {

                if (($token->type === Token::TYPE_OPERATOR) && ($token->value === '(')) {

                    $ret->parameters = ArrayObj::parse($parser, $list);

                }

                break;

            }

        }

        return $ret;