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This project contains a parser for the Checker Framework's stub files: https://checkerframework.org/manual/#stub . It is a fork of the JavaParser project.
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/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2024 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.utils;

import static java.nio.file.FileVisitResult.*;

import com.github.javaparser.ParserConfiguration;
import java.io.IOException;
import java.nio.file.*;
import java.nio.file.attribute.BasicFileAttributes;

/**
 * A brute force {@link CollectionStrategy} for discovering a project structure.
 * It will search through the given project root path for Java files,
 * look at their package declarations, and figure out the root directories for those files.
 * No project definition files like pom.xml or build.gradle are used.
 * This strategy is crude, but can work for many cases.
 * Note that any build artifacts will also be detected: jar files in target directories and so on.
 * Note that if your project has a module-info.java file, ensure that you have set the language level to at least 9.
 */
public class ParserCollectionStrategy implements CollectionStrategy {

    private final ParserConfiguration parserConfiguration;

    public ParserCollectionStrategy() {
        this(new ParserConfiguration());
    }

    public ParserCollectionStrategy(ParserConfiguration parserConfiguration) {
        this.parserConfiguration = parserConfiguration;
    }

    @Override
    public ParserConfiguration getParserConfiguration() {
        return parserConfiguration;
    }

    @Override
    public ProjectRoot collect(Path path) {
        ProjectRoot projectRoot = new ProjectRoot(path, parserConfiguration);
        try {
            Files.walkFileTree(path, new SimpleFileVisitor() {

                Path current_root;

                final PathMatcher javaMatcher = getPathMatcher("glob:**.java");

                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) {
                    if ("module-info.java".equals(file.getFileName().toString())) {
                        // module-info.java is useless for finding the source root, since it can be placed within any
                        // directory.
                        return CONTINUE;
                    }
                    if (javaMatcher.matches(file)) {
                        current_root = getRoot(file).orElse(null);
                        if (current_root != null) {
                            return SKIP_SIBLINGS;
                        }
                    }
                    return CONTINUE;
                }

                @Override
                public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) throws IOException {
                    if (Files.isHidden(dir) || (current_root != null && dir.startsWith(current_root))) {
                        return SKIP_SUBTREE;
                    }
                    return CONTINUE;
                }

                @Override
                public FileVisitResult postVisitDirectory(Path dir, IOException e) throws IOException {
                    if (current_root != null && Files.isSameFile(dir, current_root)) {
                        projectRoot.addSourceRoot(dir);
                        current_root = null;
                    }
                    return CONTINUE;
                }
            });
        } catch (IOException e) {
            Log.error(e, "Unable to walk %s", () -> path);
        }
        return projectRoot;
    }
}