cqfn/eo

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2016-2024 Objectionary.com
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

/*
 * @checkstyle PackageNameCheck (4 lines)
 * @checkstyle TrailingCommentCheck (3 lines)
 */
package EOorg.EOeolang.EOfs; // NOPMD

import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.PathMatcher;
import java.nio.file.Paths;
import java.util.stream.Stream;
import org.eolang.AtVoid;
import org.eolang.Atom;
import org.eolang.Attr;
import org.eolang.Data;
import org.eolang.Dataized;
import org.eolang.PhDefault;
import org.eolang.Phi;
import org.eolang.XmirObject;

/**
 * Dir.walk.
 *
 * @since 0.40
 * @checkstyle TypeNameCheck (100 lines)
 */
@XmirObject(oname = "dir.walk")
@SuppressWarnings("PMD.AvoidDollarSigns")
public final class EOdir$EOwalk extends PhDefault implements Atom {
    /**
     * Ctor.
     */
    @SuppressWarnings("PMD.ConstructorOnlyInitializesOrCallOtherConstructors")
    public EOdir$EOwalk() {
        this.add("glob", new AtVoid("glob"));
    }

    @Override
    public Phi lambda() throws Exception {
        final Path path = Paths.get(
            new Dataized(
                this.take(Attr.RHO).take("file").take("path")
            ).asString()
        ).toAbsolutePath();
        final String glob = new Dataized(
            this.take("glob")
        ).asString();
        final PathMatcher matcher = FileSystems.getDefault().getPathMatcher(
            String.format("glob:%s", glob)
        );
        try (Stream<Path> paths = Files.walk(path)) {
            return new Data.ToPhi(
                paths
                    .map(p -> p.toAbsolutePath().toString())
                    .map(p -> p.substring(p.indexOf(path.toString())))
                    .filter(p -> matcher.matches(Paths.get(p)))
                    .map(
                        p -> {
                            final Phi file = Phi.Φ.take("org.eolang.fs.file").copy();
                            file.put(0, new ToPhi(p));
                            return file;
                        }
                    )
                    .toArray(Phi[]::new)
            );
        }
    }
}