/**
* Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
*
* 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.linkedin.pinot.pql.parsers;
import com.linkedin.pinot.common.request.BrokerRequest;
import com.linkedin.pinot.common.request.transform.TransformExpressionTree;
import com.linkedin.pinot.pql.parsers.pql2.ast.AstNode;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.BailErrorStrategy;
import org.antlr.v4.runtime.BaseErrorListener;
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CommonToken;
import org.antlr.v4.runtime.CommonTokenFactory;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;
import org.antlr.v4.runtime.TokenStream;
import org.antlr.v4.runtime.UnbufferedTokenStream;
import org.antlr.v4.runtime.misc.NotNull;
import org.antlr.v4.runtime.misc.Nullable;
import org.antlr.v4.runtime.tree.ParseTree;
import org.antlr.v4.runtime.tree.ParseTreeWalker;
import org.apache.commons.lang3.exception.ExceptionUtils;
/**
* PQL 2 compiler.
*/
public class Pql2Compiler implements AbstractCompiler {
private static class ErrorListener extends BaseErrorListener {
@Override
public void syntaxError(@NotNull Recognizer<?, ?> recognizer, @Nullable Object offendingSymbol, int line,
int charPositionInLine, @NotNull String msg, @Nullable RecognitionException e) {
throw new Pql2CompilationException(msg, offendingSymbol, line, charPositionInLine, e);
}
}
private static final ErrorListener ERROR_LISTENER = new ErrorListener();
@Override
public BrokerRequest compileToBrokerRequest(String expression) throws Pql2CompilationException {
try {
//
CharStream charStream = new ANTLRInputStream(expression);
PQL2Lexer lexer = new PQL2Lexer(charStream);
lexer.setTokenFactory(new CommonTokenFactory(true));
lexer.removeErrorListeners();
lexer.addErrorListener(ERROR_LISTENER);
TokenStream tokenStream = new UnbufferedTokenStream<CommonToken>(lexer);
PQL2Parser parser = new PQL2Parser(tokenStream);
parser.setErrorHandler(new BailErrorStrategy());
parser.removeErrorListeners();
parser.addErrorListener(ERROR_LISTENER);
// Parse
ParseTree parseTree = parser.root();
ParseTreeWalker walker = new ParseTreeWalker();
Pql2AstListener listener = new Pql2AstListener(expression);
walker.walk(listener, parseTree);
AstNode rootNode = listener.getRootNode();
BrokerRequest brokerRequest = new BrokerRequest();
rootNode.updateBrokerRequest(brokerRequest);
return brokerRequest;
} catch (Pql2CompilationException e) {
throw e;
} catch (Exception e) {
throw new Pql2CompilationException(ExceptionUtils.getStackTrace(e));
}
}
@Override
public TransformExpressionTree compileToExpressionTree(String expression) {
CharStream charStream = new ANTLRInputStream(expression);
PQL2Lexer lexer = new PQL2Lexer(charStream);
lexer.setTokenFactory(new CommonTokenFactory(true));
TokenStream tokenStream = new UnbufferedTokenStream<CommonToken>(lexer);
PQL2Parser parser = new PQL2Parser(tokenStream);
parser.setErrorHandler(new BailErrorStrategy());
// Parse
ParseTree parseTree = parser.expression();
ParseTreeWalker walker = new ParseTreeWalker();
Pql2AstListener listener = new Pql2AstListener(expression);
walker.walk(listener, parseTree);
final AstNode rootNode = listener.getRootNode();
return TransformExpressionTree.buildTree(rootNode);
}
}