kr.ac.korea.dbserver.parser.SQLErrorStrategy.java Source code

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Here is the source code for kr.ac.korea.dbserver.parser.SQLErrorStrategy.java

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/**
 * 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 kr.ac.korea.dbserver.parser;

import org.antlr.v4.runtime.*;
import org.antlr.v4.runtime.misc.NotNull;

public class SQLErrorStrategy extends DefaultErrorStrategy {

    @Override
    public void reportError(Parser recognizer, RecognitionException e) {
        // if we've already reported an error and have not matched a token
        // yet successfully, don't report any errors.
        if (inErrorRecoveryMode(recognizer)) {
            return; // don't report spurious errors
        }
        beginErrorCondition(recognizer);
        if (e instanceof NoViableAltException) {
            reportNoViableAltException(recognizer, (NoViableAltException) e);
        } else if (e instanceof InputMismatchException) {
            reportInputMismatchException(recognizer, (InputMismatchException) e);
        } else if (e instanceof FailedPredicateException) {
            reportFailedPredicate(recognizer, (FailedPredicateException) e);
        } else {
            recognizer.notifyErrorListeners(e.getOffendingToken(), e.getMessage(), e);
        }
    }

    protected void reportNoViableAltException(@NotNull Parser recognizer, @NotNull NoViableAltException e) {
        TokenStream tokens = recognizer.getInputStream();
        String msg;
        Token token = e.getStartToken();
        if (tokens != null) {
            if (tokens.LT(-1) != null && token.getType() == Token.EOF) {
                token = tokens.LT(-1);
            }
            msg = "syntax error at or near " + getTokenErrorDisplay(token);
        } else {
            msg = "no viable alternative at input " + escapeWSAndQuote("<unknown input>");
        }
        recognizer.notifyErrorListeners(token, msg, e);
    }

    protected void reportInputMismatchException(@NotNull Parser recognizer, @NotNull InputMismatchException e) {
        String msg = "mismatched input " + getTokenErrorDisplay(e.getOffendingToken()) + " expecting "
                + e.getExpectedTokens().toString(recognizer.getTokenNames());
        recognizer.notifyErrorListeners(e.getOffendingToken(), msg, e);
    }
}