org.nlpcn.es4sql.parse.ElasticSqlSelectParser Maven / Gradle / Ivy

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package org.nlpcn.es4sql.parse;

import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLSetQuantifier;
import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
import com.alibaba.druid.sql.ast.expr.SQLLiteralExpr;
import com.alibaba.druid.sql.ast.statement.*;
import com.alibaba.druid.sql.dialect.mysql.ast.*;
import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlOutFileExpr;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectGroupBy;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUnionQuery;
import com.alibaba.druid.sql.parser.ParserException;
import com.alibaba.druid.sql.parser.SQLExprParser;
import com.alibaba.druid.sql.parser.SQLSelectParser;
import com.alibaba.druid.sql.parser.Token;

/**
 * Created by allwefantasy on 8/19/16.
 */
public class ElasticSqlSelectParser extends SQLSelectParser {
    public ElasticSqlSelectParser(SQLExprParser exprParser) {
        super(exprParser);
    }

    public ElasticSqlSelectParser(String sql) {
        this(new ElasticSqlExprParser(sql));
    }

    @Override
    public SQLSelectQuery query() {
        if (lexer.token() == (Token.LPAREN)) {
            lexer.nextToken();

            SQLSelectQuery select = query();
            accept(Token.RPAREN);

            return queryRest(select);
        }

        MySqlSelectQueryBlock queryBlock = new MySqlSelectQueryBlock();

        if (lexer.token() == Token.SELECT) {
            lexer.nextToken();

            if (lexer.token() == Token.HINT) {
                this.exprParser.parseHints(queryBlock.getHints());
            }

            if (lexer.token() == Token.COMMENT) {
                lexer.nextToken();
            }

            if (lexer.token() == (Token.DISTINCT)) {
                queryBlock.setDistionOption(SQLSetQuantifier.DISTINCT);
                lexer.nextToken();
            } else if (identifierEquals("DISTINCTROW")) {
                queryBlock.setDistionOption(SQLSetQuantifier.DISTINCTROW);
                lexer.nextToken();
            } else if (lexer.token() == (Token.ALL)) {
                queryBlock.setDistionOption(SQLSetQuantifier.ALL);
                lexer.nextToken();
            }

            if (identifierEquals("HIGH_PRIORITY")) {
                queryBlock.setHignPriority(true);
                lexer.nextToken();
            }

            if (identifierEquals("STRAIGHT_JOIN")) {
                queryBlock.setStraightJoin(true);
                lexer.nextToken();
            }

            if (identifierEquals("SQL_SMALL_RESULT")) {
                queryBlock.setSmallResult(true);
                lexer.nextToken();
            }

            if (identifierEquals("SQL_BIG_RESULT")) {
                queryBlock.setBigResult(true);
                lexer.nextToken();
            }

            if (identifierEquals("SQL_BUFFER_RESULT")) {
                queryBlock.setBufferResult(true);
                lexer.nextToken();
            }

            if (identifierEquals("SQL_CACHE")) {
                queryBlock.setCache(true);
                lexer.nextToken();
            }

            if (identifierEquals("SQL_NO_CACHE")) {
                queryBlock.setCache(false);
                lexer.nextToken();
            }

            if (identifierEquals("SQL_CALC_FOUND_ROWS")) {
                queryBlock.setCalcFoundRows(true);
                lexer.nextToken();
            }

            parseSelectList(queryBlock);

            parseInto(queryBlock);
        }

        parseFrom(queryBlock);

        parseWhere(queryBlock);

        parseGroupBy(queryBlock);

        queryBlock.setOrderBy(this.exprParser.parseOrderBy());

        if (lexer.token() == Token.LIMIT) {
            queryBlock.setLimit(parseLimit());
        }

        if (lexer.token() == Token.PROCEDURE) {
            lexer.nextToken();
            throw new ParserException("TODO");
        }

        parseInto(queryBlock);

        if (lexer.token() == Token.FOR) {
            lexer.nextToken();
            accept(Token.UPDATE);

            queryBlock.setForUpdate(true);
        }

        if (lexer.token() == Token.LOCK) {
            lexer.nextToken();
            accept(Token.IN);
            acceptIdentifier("SHARE");
            acceptIdentifier("MODE");
            queryBlock.setLockInShareMode(true);
        }

        return queryRest(queryBlock);
    }

    protected void parseInto(SQLSelectQueryBlock queryBlock) {
        if (lexer.token() == (Token.INTO)) {
            lexer.nextToken();

            if (identifierEquals("OUTFILE")) {
                lexer.nextToken();

                MySqlOutFileExpr outFile = new MySqlOutFileExpr();
                outFile.setFile(expr());

                queryBlock.setInto(outFile);

                if (identifierEquals("FIELDS") || identifierEquals("COLUMNS")) {
                    lexer.nextToken();

                    if (identifierEquals("TERMINATED")) {
                        lexer.nextToken();
                        accept(Token.BY);
                    }
                    outFile.setColumnsTerminatedBy((SQLLiteralExpr) expr());

                    if (identifierEquals("OPTIONALLY")) {
                        lexer.nextToken();
                        outFile.setColumnsEnclosedOptionally(true);
                    }

                    if (identifierEquals("ENCLOSED")) {
                        lexer.nextToken();
                        accept(Token.BY);
                        outFile.setColumnsEnclosedBy((SQLLiteralExpr) expr());
                    }

                    if (identifierEquals("ESCAPED")) {
                        lexer.nextToken();
                        accept(Token.BY);
                        outFile.setColumnsEscaped((SQLLiteralExpr) expr());
                    }
                }

                if (identifierEquals("LINES")) {
                    lexer.nextToken();

                    if (identifierEquals("STARTING")) {
                        lexer.nextToken();
                        accept(Token.BY);
                        outFile.setLinesStartingBy((SQLLiteralExpr) expr());
                    } else {
                        identifierEquals("TERMINATED");
                        lexer.nextToken();
                        accept(Token.BY);
                        outFile.setLinesTerminatedBy((SQLLiteralExpr) expr());
                    }
                }
            } else {
                queryBlock.setInto(this.exprParser.name());
            }
        }
    }

    protected void parseGroupBy(SQLSelectQueryBlock queryBlock) {
        SQLSelectGroupByClause groupBy = null;

        if (lexer.token() == Token.GROUP) {
            groupBy = new SQLSelectGroupByClause();

            lexer.nextToken();
            accept(Token.BY);

            while (true) {
                groupBy.addItem(this.getExprParser().parseSelectGroupByItem());
                if (!(lexer.token() == (Token.COMMA))) {
                    break;
                }
                lexer.nextToken();
            }

            if (lexer.token() == Token.WITH) {
                lexer.nextToken();
                acceptIdentifier("ROLLUP");

                MySqlSelectGroupBy mySqlGroupBy = new MySqlSelectGroupBy();
                for (SQLExpr sqlExpr : groupBy.getItems()) {
                    mySqlGroupBy.addItem(sqlExpr);
                }
                mySqlGroupBy.setRollUp(true);

                groupBy = mySqlGroupBy;
            }
        }

        if (lexer.token() == Token.HAVING) {
            lexer.nextToken();

            if (groupBy == null) {
                groupBy = new SQLSelectGroupByClause();
            }
            groupBy.setHaving(this.exprParser.expr());
        }

        queryBlock.setGroupBy(groupBy);
    }

    protected SQLTableSource parseTableSourceRest(SQLTableSource tableSource) {
        if (identifierEquals("USING")) {
            return tableSource;
        }

        if (lexer.token() == Token.USE) {
            lexer.nextToken();
            MySqlUseIndexHint hint = new MySqlUseIndexHint();
            parseIndexHint(hint);
            tableSource.getHints().add(hint);
        }

        if (identifierEquals("IGNORE")) {
            lexer.nextToken();
            MySqlIgnoreIndexHint hint = new MySqlIgnoreIndexHint();
            parseIndexHint(hint);
            tableSource.getHints().add(hint);
        }

        if (identifierEquals("FORCE")) {
            lexer.nextToken();
            MySqlForceIndexHint hint = new MySqlForceIndexHint();
            parseIndexHint(hint);
            tableSource.getHints().add(hint);
        }

        return super.parseTableSourceRest(tableSource);
    }

    private void parseIndexHint(MySqlIndexHintImpl hint) {
        if (lexer.token() == Token.INDEX) {
            lexer.nextToken();
        } else {
            accept(Token.KEY);
        }

        if (lexer.token() == Token.FOR) {
            lexer.nextToken();

            if (lexer.token() == Token.JOIN) {
                lexer.nextToken();
                hint.setOption(MySqlIndexHint.Option.JOIN);
            } else if (lexer.token() == Token.ORDER) {
                lexer.nextToken();
                accept(Token.BY);
                hint.setOption(MySqlIndexHint.Option.ORDER_BY);
            } else {
                accept(Token.GROUP);
                accept(Token.BY);
                hint.setOption(MySqlIndexHint.Option.GROUP_BY);
            }
        }

        accept(Token.LPAREN);
        if (lexer.token() == Token.PRIMARY) {
            lexer.nextToken();
            hint.getIndexList().add(new SQLIdentifierExpr("PRIMARY"));
        } else {
            this.exprParser.names(hint.getIndexList());
        }
        accept(Token.RPAREN);
    }

    protected MySqlUnionQuery createSQLUnionQuery() {
        return new MySqlUnionQuery();
    }

    public SQLUnionQuery unionRest(SQLUnionQuery union) {
        if (lexer.token() == Token.LIMIT) {
            MySqlUnionQuery mysqlUnionQuery = (MySqlUnionQuery) union;
            mysqlUnionQuery.setLimit(parseLimit());
        }
        return super.unionRest(union);
    }

    public MySqlSelectQueryBlock.Limit parseLimit() {
        return ((ElasticSqlExprParser) this.exprParser).parseLimit();
    }

    public ElasticSqlExprParser getExprParser() {
        return (ElasticSqlExprParser) exprParser;
    }
}