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using nio dir walking api #178

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Merged
merged 1 commit into from
Nov 15, 2025
+18 −23
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using nio dir walking api #178

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41 changes: 18 additions & 23 deletions antlr4-formatter/src/main/java/com/khubla/antlr4formatter/Antlr4Formatter.java
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,8 @@
import java.nio.charset.*;
import java.nio.file.*;
import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.antlr.parser.antlr4.*;
import org.antlr.parser.antlr4.ANTLRv4Parser.*;
Expand Down Expand Up @@ -63,9 +65,8 @@ public static String format(String string) throws Antlr4FormatterException {
}
}

public static void formatDirectory(String inputDirOption) throws Antlr4FormatterException {
List<String> files = new ArrayList<>();
files = listFilesFromDirectory(inputDirOption, files, ".g4");
public static void formatDirectory(final String inputDirOption) throws Antlr4FormatterException {
final List<String> files = listFilesFromDirectory(inputDirOption, ".g4");
for (final String filename : files) {
final File file = new File(filename);
formatSingleFile(file, file);
Expand Down Expand Up @@ -107,26 +108,20 @@ public static void formatSingleFile(String inputFilename, String outputFilename)
formatSingleFile(inputFile, outputFile);
}

private static List<String> listFilesFromDirectory(String dir, List<String> files, String filter) {
final File file = new File(dir);
final String[] list = file.list();
if (null != list) {
for (final String s : list) {
final String fileName = dir + (dir.endsWith("/") ? "" : "/") + s;
final File f2 = new File(fileName);
if (!f2.isHidden()) {
if (f2.isDirectory()) {
listFilesFromDirectory(fileName + "/", files, filter);
} else {
if (fileName.endsWith(filter)) {
files.add(fileName);
}
}
}
}
}
return files;
}
private static List<String> listFilesFromDirectory(final String dir, final String filter) {
try (Stream<Path> stream = Files.walk(Path.of(dir))) {
return stream.filter(p -> {
try {
return Files.isRegularFile(p) && !Files.isHidden(p) && p.toString().endsWith(filter);
} catch (IOException e) {
throw new RuntimeException(e);
}
}).map(p -> p.toString()).collect(Collectors.toList());
} catch (IOException ioe) {
LOG.error("Could not list files from directory {}", ioe.getMessage());
return Collections.emptyList();
}
}

private Antlr4Formatter() {
}
Expand Down