Feat: first work for rsx vscode ext

packages/vscode-ext/server/src/server.ts

@@ -0,0 +1,48 @@
+/* --------------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ * ------------------------------------------------------------------------------------------ */
+
+import { getLanguageService } from 'vscode-html-languageservice';
+import { createConnection, InitializeParams, ProposedFeatures, TextDocuments, TextDocumentSyncKind } from 'vscode-languageserver';
+import { TextDocument } from 'vscode-languageserver-textdocument';
+
+// Create a connection for the server. The connection uses Node's IPC as a transport.
+// Also include all preview / proposed LSP features.
+let connection = createConnection(ProposedFeatures.all);
+
+// Create a simple text document manager. The text document manager
+// supports full document sync only
+let documents: TextDocuments<TextDocument> = new TextDocuments(TextDocument);
+
+const htmlLanguageService = getLanguageService();
+
+connection.onInitialize((_params: InitializeParams) => {
+	return {
+		capabilities: {
+			textDocumentSync: TextDocumentSyncKind.Full,
+			// Tell the client that the server supports code completion
+			completionProvider: {
+				resolveProvider: false
+			}
+		}
+	};
+});
+
+connection.onInitialized(() => { });
+
+connection.onCompletion(async (textDocumentPosition, token) => {
+	const document = documents.get(textDocumentPosition.textDocument.uri);
+	if (!document) {
+		return null;
+	}
+
+	return htmlLanguageService.doComplete(
+		document,
+		textDocumentPosition.position,
+		htmlLanguageService.parseHTMLDocument(document)
+	);
+});
+
+documents.listen(connection);
+connection.listen();