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The core parser functionality. This may be all you need.
There is a newer version: 3.26.2
/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2023 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser 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 Lesser General Public License for more details.
 */
package com.github.javaparser;

import java.util.Comparator;
import java.util.Optional;

import static com.github.javaparser.utils.Utils.SYSTEM_EOL;
import static com.github.javaparser.utils.Utils.assertNotNull;

/**
 * A problem that was encountered during parsing.
 */
public class Problem {

    private final String message;

    private final TokenRange location;

    private final Throwable cause;

    public Problem(String message, TokenRange location, Throwable cause) {
        assertNotNull(message);
        this.message = message;
        this.location = location;
        this.cause = cause;
    }

    @Override
    public String toString() {
        final StringBuilder str = new StringBuilder(getVerboseMessage());
        if (cause != null) {
            str.append(SYSTEM_EOL).append("Problem stacktrace : ").append(SYSTEM_EOL);
            for (int i = 0; i < cause.getStackTrace().length; i++) {
                StackTraceElement ste = cause.getStackTrace()[i];
                str.append("  ").append(ste.toString());
                if (i + 1 != cause.getStackTrace().length)
                    str.append(SYSTEM_EOL);
            }
        }
        return str.toString();
    }

    /**
     * @return the message that was passed into the constructor.
     */
    public String getMessage() {
        return message;
    }

    /**
     * @return the message plus location information.
     */
    public String getVerboseMessage() {
        return getLocation().map(l -> l.getBegin().getRange().map(r -> r.begin.toString()).orElse("(line ?,col ?)") + " " + message).orElse(message);
    }

    /**
     * @return the location that was passed into the constructor.
     */
    public Optional getLocation() {
        return Optional.ofNullable(location);
    }

    /**
     * @return the cause that was passed into the constructor.
     */
    public Optional getCause() {
        return Optional.ofNullable(cause);
    }

    /**
     * Sorts problems on position.
     */
    public static Comparator PROBLEM_BY_BEGIN_POSITION = (a, b) -> {
        final Optional aBegin = a.getLocation().flatMap(l -> l.getBegin().getRange().map(r -> r.begin));
        final Optional bBegin = b.getLocation().flatMap(l -> l.getBegin().getRange().map(r -> r.begin));
        if (aBegin.isPresent() && bBegin.isPresent()) {
            return aBegin.get().compareTo(bBegin.get());
        }
        if (a.getLocation().isPresent() || b.getLocation().isPresent()) {
            if (a.getLocation().isPresent()) {
                return 1;
            }
            return -1;
        }
        return 0;
    };
}