/**
 * 对解析树进行遍历获取出select的 相关属性
 *
 * 1、获取所有字段,表,命名空间
 * 2、
 *
 */
import { StatementNode, NodeType, CurrorPosition } from '../parser/ast';
interface ReadyStatementClause {
    type: 'clause';
    start: number;
    stmno: number;
    position?: CurrorPosition;
    clause: string;
}
interface ReadyStatementBase {
    clause?: string;
    stmno: number;
    text: string;
    type: NodeType;
    start: number;
    position?: CurrorPosition;
}
interface ReadyStatementTableColumn extends ReadyStatementBase {
    as: string;
    namespace?: ReadyStatementBase;
}
interface ReadyStatementColumn extends ReadyStatementTableColumn {
    table: ReadyStatementBase;
}
/**
 *
 * 光标定位
 * 1、光标位于关键字后面:
 *    1.1、如果是select关键字: 推字段/表/
 *    1.2、如果是from 关键字后面
 *
 */
interface PositionClause {
    clause: string;
    grammar: string;
    place?: string;
    position: CurrorPosition;
    start: number;
    type: 'keyword' | 'parenthesis' | 'property_access' | '';
    target: any;
    stmno: number;
}
interface ReadyStatement {
    stmno: number;
    position: PositionClause;
    functions: any[];
    clause: ReadyStatementClause[];
    namespaces: ReadyStatementBase[];
    tables: ReadyStatementTableColumn[];
    columns: ReadyStatementColumn[];
}
declare class SelectStatementReader {
    private noColumnTypeMap;
    private pushStatement;
    private markPosition;
    private markCommaPosition;
    /**
     * 遍历语法树children
     * @param clause
     * @param result
     * @param stmno
     * @param clauseType
     * @param as
     */
    private walkStatementChildren;
    /**
     *
     * @param clause
     * @param result
     * @param stmno
     * @param clauseType
     * @param as
     */
    private walkDealPropertyIdentifier;
    private walkStatementWhere;
    /**
     * 遍历字段或则表子句
     * @param clause
     * @param result
     * @param stmno
     * @param clauseType
     */
    private walkColumnTableClause;
    private groupStatementByComma;
    private walkSelectStatement;
    private walkStatementSelectWhere;
    /**
     * 简单判断是否是where子句
     * @param statement
     */
    private isWhereStatement;
    /**
     *
     * @param statements
     * @param result
     */
    private walkStatement;
    private readSelectStatement;
    /**
     * 读取表字段信息,获取格式如下
     * {
     *   // 所有命名空间
     *   namespaces: [],
     *   // 所有表
     *   tables: [],
     *   // 所有字段
     *   fields: []
     * }
     *
     * @param ast
     */
    readStatement(asts: StatementNode[]): ReadyStatement;
}
declare const _default: SelectStatementReader;
export default _default;