com.basho.contact.ContactErrorListener.java Source code

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Here is the source code for com.basho.contact.ContactErrorListener.java

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/*
 * -------------------------------------------------------------------
 * Contact: a language and interactive shell for Riak
 *
 * Copyright (c) 2013 Dave Parfitt
 *
 * This file is provided 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 com.basho.contact;

import org.antlr.v4.runtime.*;

public class ContactErrorListener extends BaseErrorListener {

    RuntimeContext runtimeCtx;

    public ContactErrorListener(RuntimeContext runtimeCtx) {
        this.runtimeCtx = runtimeCtx;
    }

    @Override
    public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line, int charPositionInLine,
            String msg, RecognitionException e) {
        //System.err.println("line " + line + ":" + charPositionInLine + " " + msg);
        underlineError(recognizer, (Token) offendingSymbol, line, charPositionInLine);
        runtimeCtx.setParseError(true);
        throw new RuntimeException("Syntax error at line " + line + " character " + charPositionInLine);
    }

    protected void underlineError(Recognizer recognizer, Token offendingToken, int line, int charPositionInLine) {
        CommonTokenStream tokens = (CommonTokenStream) recognizer.getInputStream();
        String input = tokens.getTokenSource().getInputStream().toString();
        String lines[] = input.split("\n");
        String errorLine = lines[line - 1];
        System.err.println(errorLine);
        for (int i = 0; i < charPositionInLine; i++)
            System.err.print(" ");
        int start = offendingToken.getStartIndex();
        int stop = offendingToken.getStopIndex();
        if (start >= 0 && stop >= 0) {
            for (int i = start; i <= stop; i++)
                System.err.print("^");
        }
        System.err.println();
    }

}