Fix: Error when using paths with non-ASCII characters for file watching on Unix/MacOS

Author: FlorianKroiss

org.eclipse.lsp4e.test/src/org/eclipse/lsp4e/test/edit/LSPEclipseUtilsTest.java

@@ -332,7 +332,6 @@ public void testUNCwindowsURI() {
     public void testToUri_WindowsUNC() {
         File unc = new File("\\\\localhost\\c$\\Windows");
         URI uri = LSPEclipseUtils.toUri(unc);
-        System.err.println(uri.toString());
         assertTrue(uri.toString().startsWith("file://localhost/c$/Windows"));
 
 		File uncWithSpaces = new File("\\\\server-name\\shared folder\\dir with space");
@@ -342,6 +341,14 @@ public void testToUri_WindowsUNC() {
 		// Ensure there is an authority and no malformed quadruple slashes
 		assertFalse(uriWithSpaces.toString().startsWith("file:////"));
 	}
+    
+	@Test
+	void testFileUriWithNonAsciiPath() throws Exception {
+		// File name contains a German Eszett and a Japanese Kana
+		String fileName = "foo ßア";
+		IFile targetFile = project.getFile(fileName);
+		assertEquals(fileName, Paths.get(LSPEclipseUtils.toUri(targetFile)).getFileName().toString());
+	}
 
 	@Test
 	public void testToWorkspaceFolder() {

org.eclipse.lsp4e.test/src/org/eclipse/lsp4e/test/files/FileSystemWatcherManagerTest.java

@@ -12,13 +12,15 @@
  *******************************************************************************/
 package org.eclipse.lsp4e.test.files;
 
-import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import java.net.URI;
 import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.List;
 
+import org.eclipse.lsp4e.LSPEclipseUtils;
 import org.eclipse.lsp4e.internal.files.FileSystemWatcherManager;
 import org.eclipse.lsp4j.FileSystemWatcher;
 import org.eclipse.lsp4j.WatchKind;
@@ -128,6 +130,15 @@ void watcherKindFiltering() {
 		assertNoMatchFile(deleteUri, WatchKind.Change);
 		assertMatchFile(deleteUri, WatchKind.Delete);
 	}
+	
+	@Test
+	void nonAsciiFile() {
+		registerWatchers("watcher-kind", List.of(
+				new FileSystemWatcher(Either.forLeft("*.txt"), null)));
+		// We use LSPEclipseUtils.toUri because this is also used to create the URI to check
+		URI createUri = LSPEclipseUtils.toUri(projectDir.resolve("fooß.txt").toFile());
+		assertMatchFile(createUri, WatchKind.Create);
+	}
 
 	@Test
 	void globMatchingSimple() {

org.eclipse.lsp4e/src/org/eclipse/lsp4e/LSPEclipseUtils.java

@@ -31,7 +31,6 @@
 import java.io.OutputStream;
 import java.lang.reflect.Method;
 import java.net.URI;
-import java.net.URISyntaxException;
 import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -1345,21 +1344,8 @@ public static URI toUri(IPath absolutePath) {
 	}
 
 	public static URI toUri(File file) {
-		// URI scheme specified by language server protocol and LSP
-		try {
-			final var path = file.getAbsoluteFile().toURI().getPath();
-			if (path.startsWith("//")) { // UNC path like //localhost/c$/Windows/ //$NON-NLS-1$
-				// split: authority = "localhost", absPath = "/c$/Windows/"
-				final int slash = path.indexOf('/', 2);
-				final String authority = slash > 2 ? path.substring(2, slash) : path.substring(2);
-				final String absPath = slash > 2 ? path.substring(slash) : "/"; //$NON-NLS-1$
-				return new URI(FILE_SCHEME, authority, absPath, null);
-			}
-			return new URI(FILE_SCHEME, "", path, null); //$NON-NLS-1$
-		} catch (URISyntaxException e) {
-			LanguageServerPlugin.logError(e);
-			return file.getAbsoluteFile().toURI();
-		}
+		// Perform one round-trip to make sure all non-ASCII characters are properly encoded.
+		return URI.create((file.toPath().toUri()).toASCIIString());
 	}
 
 	public static @Nullable IFile getFile(@Nullable IDocument document) {