org.ehrbase.aql.compiler.AqlErrorHandler Maven / Gradle / Ivy

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/*
 * Copyright (c) 2019 vitasystems GmbH and Hannover Medical School.
 *
 * This file is part of project EHRbase
 *
 * Licensed 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
 *
 *     https://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.ehrbase.aql.compiler;

import java.util.BitSet;
import org.antlr.v4.runtime.*;
import org.antlr.v4.runtime.atn.ATNConfigSet;
import org.antlr.v4.runtime.dfa.DFA;
import org.antlr.v4.runtime.misc.ParseCancellationException;
import org.ehrbase.aql.compiler.recovery.RecoverArchetypeId;

/**
 * Utility class to handle specific errors during parsing

 * Allows to return more meaningful messages during AQL parsing
 * Created by christian on 4/15/2016.
 */
public class AqlErrorHandler extends BaseErrorListener {

    public static final AqlErrorHandler INSTANCE = new AqlErrorHandler();
    public static final boolean REPORT_SYNTAX_ERRORS = true;

    @Override
    public void syntaxError(
            Recognizer recognizer,
            Object offendingSymbol,
            int line,
            int charPositionInLine,
            String msg,
            RecognitionException e) {
        if (!REPORT_SYNTAX_ERRORS) {
            return;
        }

        String sourceName = recognizer.getInputStream().getSourceName();
        if (!sourceName.isEmpty()) {
            sourceName = String.format("%s:%d:%d: ", sourceName, line, charPositionInLine);
        }

        if (e != null && new RecoverArchetypeId().isRecoverableArchetypeId(e.getCtx(), offendingSymbol)) {
            return; // ignore since it will be 'fixed' by the recognizer
        }

        throw new ParseCancellationException(
                "AQL Parse exception: " + (sourceName.isEmpty() ? "source:" + sourceName : "") + "line " + line
                        + ": char " + charPositionInLine + " " + msg);
    }

    @Override
    public void reportAmbiguity(
            Parser recognizer,
            DFA dfa,
            int startIndex,
            int stopIndex,
            boolean exact,
            BitSet ambigAlts,
            ATNConfigSet configs) {

        //        System.out.println("Ambiguous");
    }
}