/*
* 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.lucene.expressions.js;
import java.text.ParseException;
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.LexerNoViableAltException;
import org.antlr.v4.runtime.misc.Interval;
/**
* Overrides the ANTLR 4 generated JavascriptLexer to allow for proper error handling
*/
class JavascriptErrorHandlingLexer extends JavascriptLexer {
/**
* Constructor for JavascriptErrorHandlingLexer
* @param charStream the stream for the source text
*/
public JavascriptErrorHandlingLexer(CharStream charStream) {
super(charStream);
}
/**
* Ensures the ANTLR lexer will throw an exception after the first error
* @param lnvae the lexer exception
*/
@Override
public void recover(LexerNoViableAltException lnvae) {
CharStream charStream = lnvae.getInputStream();
int startIndex = lnvae.getStartIndex();
String text = charStream.getText(Interval.of(startIndex, charStream.index()));
ParseException parseException = new ParseException("unexpected character '" + getErrorDisplay(text) + "'" +
" on line (" + _tokenStartLine + ") position (" + _tokenStartCharPositionInLine + ")", _tokenStartCharIndex);
parseException.initCause(lnvae);
throw new RuntimeException(parseException);
}
}