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ANTLR grammar and Java logic used to traverse the generated abstract syntax trees related to Arden-syntax Medical Logic Modules (MLMs)

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/*
 * Copyright 2015 The University of Vermont and State
 * Agricultural College, Vermont Oxford Network, and The University
 * of Vermont Medical Center.  All rights reserved.
 *
 * Written by Matthew B. Storer 
 *
 * This file is part of Arden Parser.
 *
 * Arden Parser is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Arden Parser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Arden Parser.  If not, see .
 */

package edu.uvm.ccts.jmethodsig;

import edu.uvm.ccts.common.exceptions.antlr.AntlrException;
import edu.uvm.ccts.jmethodsig.antlr.JMethodSigParser;
import org.antlr.v4.runtime.*;
import org.antlr.v4.runtime.misc.NotNull;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Created by mstorer on 11/20/13.
 */
public class BailJMethodSigParser extends JMethodSigParser {
    private static final Log log = LogFactory.getLog(JMethodSigParser.class);

    public BailJMethodSigParser(TokenStream input) {
        super(input);
        setErrorHandler(new JMethodSigParserErrorHandler());
    }

    public static final class JMethodSigParserErrorHandler extends DefaultErrorStrategy {
        @Override
        public void recover(Parser recognizer, RecognitionException e) {
            String message = "failed to parse Java method signature.  offending token: " + e.getOffendingToken().toString();
            throw new AntlrException(AntlrException.Type.PARSER, message, e);
        }

        @Override
        public Token recoverInline(Parser recognizer) throws RecognitionException {
            InputMismatchException e = new InputMismatchException(recognizer);
            String message = "failed to parse Java method signature.  offending token: " + e.getOffendingToken().toString();
            throw new AntlrException(AntlrException.Type.PARSER, message, e);
        }

        @Override
        public void reportError(Parser recognizer, RecognitionException e) {
            if (log.isDebugEnabled()) {
                super.reportError(recognizer, e);
            }
        }

        @Override
        public void sync(Parser recognizer) { }

        @Override
        protected void reportNoViableAlternative(@NotNull Parser recognizer, @NotNull NoViableAltException e) {
            log.debug("no viable alternative for token " + buildTokenInfo(e.getOffendingToken()));
        }

        @Override
        protected void reportInputMismatch(@NotNull Parser recognizer, @NotNull InputMismatchException e) {
            log.debug("input mismatch for token " + buildTokenInfo(e.getOffendingToken()));
        }

        @Override
        protected void reportFailedPredicate(@NotNull Parser recognizer, @NotNull FailedPredicateException e) {
            log.debug("failed predicate for token " + buildTokenInfo(e.getOffendingToken()));
        }

        private String buildTokenInfo(Token t) {
            return "'" + t.getText() + "' at (" + t.getLine() + ":" + t.getCharPositionInLine() + ")";
        }
    }
}