fix(language-server): cannot restore uri from untitled document fileName

packages/language-server/browser.ts

@@ -1,8 +1,8 @@
 import { FileType } from '@volar/language-service';
 import * as vscode from 'vscode-languageserver/browser';
-import { URI } from 'vscode-uri';
 import httpSchemaRequestHandler from './lib/schemaRequestHandlers/http';
 import { createServerBase } from './lib/server';
+import { fileNameToUri, uriToFileName } from './lib/uri';
 import { FsReadDirectoryRequest, FsReadFileRequest, FsStatRequest } from './protocol';
 
 export * from 'vscode-languageserver/browser';
@@ -99,27 +99,3 @@ export function createServer(connection: vscode.Connection) {
 		},
 	}));
 }
-
-function uriToFileName(uri: string) {
-	const parsed = URI.parse(uri);
-	if (parsed.scheme === '__invalid__') {
-		return parsed.path;
-	}
-	return `/${parsed.scheme}${parsed.authority ? '@' + parsed.authority : ''}${parsed.path}`;
-}
-
-function fileNameToUri(fileName: string) {
-	const parts = fileName.split('/');
-	if (parts.length <= 1) {
-		return URI.from({
-			scheme: '__invalid__',
-			path: fileName,
-		}).toString();
-	}
-	const firstParts = parts[1].split('@');
-	return URI.from({
-		scheme: firstParts[0],
-		authority: firstParts.length > 1 ? firstParts[1] : undefined,
-		path: '/' + parts.slice(2).join('/'),
-	}).toString();
-}

packages/language-server/lib/uri.ts

@@ -0,0 +1,21 @@
+import { URI } from 'vscode-uri';
+
+export function uriToFileName(uri: string) {
+	const parsed = URI.parse(uri);
+	if (parsed.scheme === 'file') {
+		return parsed.fsPath.replace(/\\/g, '/');
+	}
+	return `${parsed.scheme}@@${parsed.authority}@@${parsed.path}`;
+}
+
+export function fileNameToUri(fileName: string) {
+	if (fileName.includes('@@')) {
+		const parts = fileName.split('@@');
+		return URI.from({
+			scheme: parts[0],
+			authority: parts[1],
+			path: parts[2],
+		}).toString();
+	}
+	return URI.file(fileName).toString();
+}

packages/language-server/node.ts

@@ -1,20 +1,16 @@
 import { FileSystem, FileType } from '@volar/language-service';
 import * as fs from 'fs';
 import * as vscode from 'vscode-languageserver/node';
-import { URI } from 'vscode-uri';
 import httpSchemaRequestHandler from './lib/schemaRequestHandlers/http';
 import { createServerBase } from './lib/server';
 import type { InitializationOptions } from './lib/types';
+import { fileNameToUri, uriToFileName } from './lib/uri';
 
 export * from 'vscode-languageserver/node';
 export * from './index';
 export * from './lib/project/simpleProjectProvider';
 export * from './lib/project/typescriptProjectProvider';
 
-export const uriToFileName = (uri: string) => URI.parse(uri).fsPath.replace(/\\/g, '/');
-
-export const fileNameToUri = (fileName: string) => URI.file(fileName).toString();
-
 export function createFs(options: InitializationOptions): FileSystem {
 	return {
 		stat(uri) {

packages/language-server/tests/uri.spec.ts

@@ -0,0 +1,21 @@
+import { describe, expect, test } from 'vitest';
+import { URI } from 'vscode-uri';
+import { fileNameToUri, uriToFileName } from '../lib/uri';
+
+describe('URI', () => {
+
+	test('recoverable', () => {
+
+		const cases = [
+			'file:///a/b/c',
+			'test://test/test.html',
+			'file:///c:/a/b/c',
+			'file:///C:/a/b/c',
+			'untitled:Untitled-1',
+		];
+
+		for (const uri of cases) {
+			expect(fileNameToUri(uriToFileName(uri))).toBe(URI.parse(uri).toString());
+		}
+	});
+});