eagle-core/eagle-query/eagle-antlr/src/main/java/org/apache/eagle/query/parser/EagleANTLRErrorStrategy.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.eagle.query.parser;

import org.antlr.v4.runtime.*;

public class EagleANTLRErrorStrategy extends DefaultErrorStrategy {
	/** Instead of recovering from exception {@code e}, re-throw it wrapped
	 *  in a {@link org.antlr.v4.runtime.misc.ParseCancellationException} so it is not caught by the
	 *  rule function catches.  Use {@link Exception#getCause()} to get the
	 *  original {@link org.antlr.v4.runtime.RecognitionException}.
	 */
	@Override
	public void recover(Parser recognizer, RecognitionException e) {
		for (ParserRuleContext context = recognizer.getContext(); context != null; context = context.getParent()) {
			context.exception = e;
		}
		super.recover(recognizer,e);
	}

	/** Make sure we don't attempt to recover inline; if the parser
	 *  successfully recovers, it won't throw an exception.
	 */
	@Override
	public Token recoverInline(Parser recognizer)
			throws RecognitionException
	{
		InputMismatchException e = new InputMismatchException(recognizer);
		for (ParserRuleContext context = recognizer.getContext(); context != null; context = context.getParent()) {
			context.exception = e;
		}
		return super.recoverInline(recognizer);
	}
}