Added language server for HTML and CSS

.gitignore

@@ -1,2 +1,6 @@
 *.vsix
-local/
+local/
+out
+node_modules
+client/server
+.vscode-test

.vscode/launch.json

@@ -13,6 +13,14 @@
             "args": [
                 "--extensionDevelopmentPath=${workspaceFolder}"
             ]
-        }
+        },
+        {
+			"type": "node",
+			"request": "attach",
+			"name": "Attach to Server",
+			"port": 6009,
+			"restart": true,
+			"outFiles": ["${workspaceRoot}/server/out/**/*.js"]
+		},
     ]
 }

client/package.json

@@ -0,0 +1,22 @@
+{
+	"name": "lsp-sample-client",
+	"description": "VSCode part of a language server",
+	"author": "Microsoft Corporation",
+	"license": "MIT",
+	"version": "0.0.1",
+	"publisher": "vscode",
+	"repository": {
+		"type": "git",
+		"url": "https://github.com/Microsoft/vscode-extension-samples"
+	},
+	"engines": {
+		"vscode": "^1.43.0"
+	},
+	"dependencies": {
+		"vscode-languageclient": "^6.1.3"
+	},
+	"devDependencies": {
+		"@types/node": "^12.12.0",
+		"@types/vscode": "^1.43.0"
+	}
+}

client/src/extension.ts

@@ -0,0 +1,61 @@
+/* --------------------------------------------------------------------------------------------
+ * Copyright (c) Microsoft Corporation. All rights reserved.
+ * Licensed under the MIT License. See License.txt in the project root for license information.
+ * ------------------------------------------------------------------------------------------ */
+
+import * as path from 'path';
+import { ExtensionContext } from 'vscode';
+
+import {
+	LanguageClient,
+	LanguageClientOptions,
+	ServerOptions,
+	TransportKind
+} from 'vscode-languageclient';
+
+let client: LanguageClient;
+
+export function activate(context: ExtensionContext) {
+	// The server is implemented in node
+	let serverModule = context.asAbsolutePath(
+		path.join('server', 'out', 'server.js')
+	);
+	// The debug options for the server
+	// --inspect=6009: runs the server in Node's Inspector mode so VS Code can attach to the server for debugging
+	let debugOptions = { execArgv: ['--nolazy', '--inspect=6009'] };
+
+	// If the extension is launched in debug mode then the debug server options are used
+	// Otherwise the run options are used
+	let serverOptions: ServerOptions = {
+		run: { module: serverModule, transport: TransportKind.ipc },
+		debug: {
+			module: serverModule,
+			transport: TransportKind.ipc,
+			options: debugOptions
+		}
+	};
+
+	// Options to control the language client
+	let clientOptions: LanguageClientOptions = {
+		// Register the server for plain text documents
+		documentSelector: [{ scheme: 'file', language: 'abell' }]
+	};
+
+	// Create the language client and start the client.
+	client = new LanguageClient(
+		'languageServerExample',
+		'Language Server Example',
+		serverOptions,
+		clientOptions
+	);
+
+	// Start the client. This will also launch the server
+	client.start();
+}
+
+export function deactivate(): Thenable<void> | undefined {
+	if (!client) {
+		return undefined;
+	}
+	return client.stop();
+}

client/tsconfig.json

@@ -0,0 +1,12 @@
+{
+	"compilerOptions": {
+		"module": "commonjs",
+		"target": "es2019",
+		"lib": ["ES2019"],
+		"outDir": "out",
+		"rootDir": "src",
+		"sourceMap": true
+	},
+	"include": ["src"],
+	"exclude": ["node_modules", ".vscode-test"]
+}