package com.alibaba.druid.sql.dialect.postgresql.parser;
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.statement.SQLExprTableSource;
import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGSelectQueryBlock;
import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGSelectQueryBlock.IntoOption;
import com.alibaba.druid.sql.parser.Lexer;
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;
public class PGSelectParser extends SQLSelectParser {
public PGSelectParser(Lexer lexer){
super(lexer);
}
public PGSelectParser(String sql) throws ParserException{
this(new PGLexer(sql));
this.lexer.nextToken();
}
protected SQLExprParser createExprParser() {
return new PGExprParser(lexer);
}
@Override
public SQLSelectQuery query() throws ParserException {
PGSelectQueryBlock queryBlock = new PGSelectQueryBlock();
if (lexer.token() == Token.SELECT) {
lexer.nextToken();
if (lexer.token() == Token.DISTINCT) {
queryBlock.setDistionOption(SQLSetQuantifier.DISTINCT);
lexer.nextToken();
if (lexer.token() == Token.ON) {
lexer.nextToken();
for (;;) {
SQLExpr expr = this.createExprParser().expr();
queryBlock.getDistinctOn().add(expr);
if (lexer.token() == Token.COMMA) {
lexer.nextToken();
continue;
} else {
break;
}
}
}
} else if (lexer.token() == Token.ALL) {
queryBlock.setDistionOption(SQLSetQuantifier.ALL);
lexer.nextToken();
}
parseSelectList(queryBlock);
if (lexer.token() == Token.INTO) {
lexer.nextToken();
if (lexer.token() == Token.TEMPORARY) {
lexer.nextToken();
queryBlock.setIntoOption(IntoOption.TEMPORARY);
} else if (lexer.token() == Token.TEMP) {
lexer.nextToken();
queryBlock.setIntoOption(IntoOption.TEMP);
} else if (lexer.token() == Token.UNLOGGED) {
lexer.nextToken();
queryBlock.setIntoOption(IntoOption.UNLOGGED);
}
if (lexer.token() == Token.TABLE) {
lexer.nextToken();
}
SQLExpr name = this.createExprParser().name();
queryBlock.setInto(new SQLExprTableSource(name));
}
}
parseFrom(queryBlock);
parseWhere(queryBlock);
parseGroupBy(queryBlock);
if (lexer.token() == Token.WINDOW) {
lexer.nextToken();
PGSelectQueryBlock.WindowClause window = new PGSelectQueryBlock.WindowClause();
window.setName(this.expr());
accept(Token.AS);
for (;;) {
SQLExpr expr = this.createExprParser().expr();
window.getDefinition().add(expr);
if (lexer.token() == Token.COMMA) {
lexer.nextToken();
continue;
} else {
break;
}
}
queryBlock.setWindow(window);
}
queryBlock.setOrderBy(this.createExprParser().parseOrderBy());
if (lexer.token() == Token.LIMIT) {
lexer.nextToken();
if (lexer.token() == Token.ALL) {
queryBlock.setLimit(new SQLIdentifierExpr("ALL"));
lexer.nextToken();
} else {
SQLExpr limit = expr();
queryBlock.setLimit(limit);
}
}
if (lexer.token() == Token.OFFSET) {
lexer.nextToken();
SQLExpr offset = expr();
queryBlock.setOffset(offset);
if (lexer.token() == Token.ROW || lexer.token() == Token.ROWS) {
lexer.nextToken();
} else {
//TODO
//throw new ParserException("expect 'ROW' or 'ROWS'");
}
}
if (lexer.token() == Token.FETCH) {
lexer.nextToken();
PGSelectQueryBlock.FetchClause fetch = new PGSelectQueryBlock.FetchClause();
if (lexer.token() == Token.FIRST) {
fetch.setOption(PGSelectQueryBlock.FetchClause.Option.FIRST);
} else if (lexer.token() == Token.NEXT) {
fetch.setOption(PGSelectQueryBlock.FetchClause.Option.NEXT);
} else {
throw new ParserException("expect 'FIRST' or 'NEXT'");
}
SQLExpr count = expr();
fetch.setCount(count);
if (lexer.token() == Token.ROW || lexer.token() == Token.ROWS) {
lexer.nextToken();
} else {
throw new ParserException("expect 'ROW' or 'ROWS'");
}
if (lexer.token() == Token.ONLY) {
lexer.nextToken();
} else {
throw new ParserException("expect 'ONLY'");
}
queryBlock.setFetch(fetch);
}
if (lexer.token() == Token.FOR) {
lexer.nextToken();
PGSelectQueryBlock.ForClause forClause = new PGSelectQueryBlock.ForClause();
if (lexer.token() == Token.UPDATE) {
forClause.setOption(PGSelectQueryBlock.ForClause.Option.UPDATE);
} else if (lexer.token() == Token.SHARE) {
forClause.setOption(PGSelectQueryBlock.ForClause.Option.SHARE);
} else {
throw new ParserException("expect 'FIRST' or 'NEXT'");
}
accept(Token.OF);
for (;;) {
SQLExpr expr = this.createExprParser().expr();
forClause.getOf().add(expr);
if (lexer.token() == Token.COMMA) {
lexer.nextToken();
continue;
} else {
break;
}
}
if (lexer.token() == Token.NOWAIT) {
lexer.nextToken();
forClause.setNoWait(true);
}
queryBlock.setForClause(forClause);
}
return queryRest(queryBlock);
}
}