Enable syntax language server (#1329)

Signed-off-by: Jinbo Wang <jinbwan@microsoft.com>

Author: testforstephen

.vscode/launch.json

@@ -41,6 +41,35 @@
 			},
 			"preLaunchTask": "npm: watch"
 		},
+		{
+			"name": "Launch Extension - SyntaxLS Client",
+			"type": "extensionHost",
+			"request": "launch",
+			"runtimeExecutable": "${execPath}",
+			"args": ["--extensionDevelopmentPath=${workspaceRoot}" ],
+			"stopOnEntry": false,
+			"sourceMaps": true,
+			"outFiles": [ "${workspaceRoot}/dist/**/*.js" ],
+			"env": {
+				"SYNTAXLS_CLIENT_PORT": "5037"
+			},
+			"preLaunchTask": "npm: watch"
+		},
+		{
+			"name": "Launch Extension - Hybrid Clients",
+			"type": "extensionHost",
+			"request": "launch",
+			"runtimeExecutable": "${execPath}",
+			"args": ["--extensionDevelopmentPath=${workspaceRoot}" ],
+			"stopOnEntry": false,
+			"sourceMaps": true,
+			"outFiles": [ "${workspaceRoot}/dist/**/*.js" ],
+			"env": {
+				"JDTLS_CLIENT_PORT": "5036",
+				"SYNTAXLS_CLIENT_PORT": "5037"
+			},
+			"preLaunchTask": "npm: watch"
+		},
 		{
 			"name": "Launch Tests",
 			"type": "extensionHost",

package.json

@@ -500,6 +500,22 @@
           "default": [],
           "description": "Java Execution Environments -> Runtimes.",
           "scope": "machine"
+        },
+        "java.server.launchMode": {
+          "type": "string",
+          "enum": [
+            "Standard",
+            "LightWeight",
+            "Hybrid"
+          ],
+          "enumDescriptions": [
+            "Provides full features such as intellisense, refactoring, building, Maven/Gradle support etc.",
+            "Starts a syntax server with lower start-up cost. Only provides syntax features such as outline, navigation, javadoc, syntax errors.",
+            "Provides full features with better responsiveness. It starts a standard language server and a secondary syntax server. The syntax server provides syntax features until the standard server is ready."
+          ],
+          "description": "The launch mode for the Java extension",
+          "default": "Hybrid",
+          "scope": "window"
         }
       }
     },