com.blazebit.persistence.parser.SqlParserUtils Maven / Gradle / Ivy
/*
* Copyright 2014 - 2023 Blazebit.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.blazebit.persistence.parser;
import com.blazebit.persistence.parser.expression.SyntaxErrorException;
import org.antlr.v4.runtime.ANTLRErrorListener;
import org.antlr.v4.runtime.CharStreams;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.Parser;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;
import org.antlr.v4.runtime.atn.ATNConfigSet;
import org.antlr.v4.runtime.dfa.DFA;
import java.util.BitSet;
/**
* @author Christian Beikov
* @since 1.5.0
*/
public class SqlParserUtils {
private static final ANTLRErrorListener ERR_LISTENER = new ANTLRErrorListener() {
@Override
public void syntaxError(Recognizer recognizer, Object offendingSymbol, int line, int charPositionInLine, String msg, RecognitionException e) {
throw new SyntaxErrorException("line " + line + ":" + charPositionInLine + " " + msg);
}
@Override
public void reportAmbiguity(Parser recognizer, DFA dfa, int startIndex, int stopIndex, boolean exact, BitSet ambigAlts, ATNConfigSet configs) {
}
@Override
public void reportAttemptingFullContext(Parser recognizer, DFA dfa, int startIndex, int stopIndex, BitSet conflictingAlts, ATNConfigSet configs) {
}
@Override
public void reportContextSensitivity(Parser recognizer, DFA dfa, int startIndex, int stopIndex, int prediction, ATNConfigSet configs) {
}
};
private SqlParserUtils() {
}
public static T visitSelectStatement(CharSequence sql, SQLParserBaseVisitor visitor) {
SQLLexer lexer = new SQLLexer(CharStreams.fromString(sql.toString()));
lexer.removeErrorListeners();
lexer.addErrorListener(ERR_LISTENER);
SQLParser parser = new SQLParser(new CommonTokenStream(lexer));
parser.removeErrorListeners();
parser.addErrorListener(ERR_LISTENER);
return parser.parseSelectStatement().accept(visitor);
}
}