org.elasticsearch.painless.ParserErrorStrategy.java Source code

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Here is the source code for org.elasticsearch.painless.ParserErrorStrategy.java

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/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.painless;

import org.antlr.v4.runtime.DefaultErrorStrategy;
import org.antlr.v4.runtime.InputMismatchException;
import org.antlr.v4.runtime.NoViableAltException;
import org.antlr.v4.runtime.Parser;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Token;

import java.text.ParseException;

class ParserErrorStrategy extends DefaultErrorStrategy {
    @Override
    public void recover(Parser recognizer, RecognitionException re) {
        Token token = re.getOffendingToken();
        String message;

        if (token == null) {
            message = "Error: no parse token found.";
        } else if (re instanceof InputMismatchException) {
            message = "Error[" + token.getLine() + ":" + token.getCharPositionInLine() + "]:"
                    + " unexpected token [" + getTokenErrorDisplay(token) + "]" + " was expecting one of ["
                    + re.getExpectedTokens().toString(recognizer.getVocabulary()) + "].";
        } else if (re instanceof NoViableAltException) {
            if (token.getType() == PainlessParser.EOF) {
                message = "Error: unexpected end of script.";
            } else {
                message = "Error[" + token.getLine() + ":" + token.getCharPositionInLine() + "]:"
                        + "invalid sequence of tokens near [" + getTokenErrorDisplay(token) + "].";
            }
        } else {
            message = "Error[" + token.getLine() + ":" + token.getCharPositionInLine() + "]:"
                    + " unexpected token near [" + getTokenErrorDisplay(token) + "].";
        }

        ParseException parseException = new ParseException(message, token == null ? -1 : token.getStartIndex());
        parseException.initCause(re);

        throw new RuntimeException(parseException);
    }

    @Override
    public Token recoverInline(Parser recognizer) throws RecognitionException {
        Token token = recognizer.getCurrentToken();
        String message = "Error[" + token.getLine() + ":" + token.getCharPositionInLine() + "]:"
                + " unexpected token [" + getTokenErrorDisplay(token) + "]" + " was expecting one of ["
                + recognizer.getExpectedTokens().toString(recognizer.getVocabulary()) + "].";
        ParseException parseException = new ParseException(message, token.getStartIndex());
        throw new RuntimeException(parseException);
    }

    @Override
    public void sync(Parser recognizer) {
    }
}