Fix syntax in LanguageServer

Author: odersky

language-server/src/dotty/tools/languageserver/DottyLanguageServer.scala

@@ -65,7 +65,7 @@ class DottyLanguageServer extends LanguageServer
   private[this] var myDependentProjects: mutable.Map[ProjectConfig, mutable.Set[ProjectConfig]] = _
 
   def drivers: Map[ProjectConfig, InteractiveDriver] = thisServer.synchronized {
-    if myDrivers == null
+    if myDrivers == null then
       assert(rootUri != null, "`drivers` cannot be called before `initialize`")
       val configFile = new File(new URI(rootUri + '/' + IDE_CONFIG_FILE))
       val configs: List[ProjectConfig] = (new ObjectMapper).readValue(configFile, classOf[Array[ProjectConfig]]).toList
@@ -102,12 +102,12 @@ class DottyLanguageServer extends LanguageServer
     System.gc()
     for ((_, driver, opened) <- driverConfigs; (uri, source) <- opened)
       driver.run(uri, source)
-    if Memory.isCritical()
+    if Memory.isCritical() then
       println(s"WARNING: Insufficient memory to run Scala language server on these projects.")
   }
 
   private def checkMemory() =
-    if Memory.isCritical()
+    if Memory.isCritical() then
       CompletableFutures.computeAsync { _ => restart() }
 
   /** The configuration of the project that owns `uri`. */
@@ -149,7 +149,7 @@ class DottyLanguageServer extends LanguageServer
 
   /** A mapping from project `p` to the set of projects that transitively depend on `p`. */
   def dependentProjects: Map[ProjectConfig, Set[ProjectConfig]] = thisServer.synchronized {
-    if myDependentProjects == null
+    if myDependentProjects == null then
       val idToConfig = drivers.keys.map(k => k.id -> k).toMap
       val allProjects = drivers.keySet
 
@@ -192,7 +192,7 @@ class DottyLanguageServer extends LanguageServer
             throw ex
         }
       }
-      if synchronize
+      if synchronize then
         thisServer.synchronized { computation() }
       else
         computation()
@@ -829,15 +829,15 @@ object DottyLanguageServer {
     def completionItemKind(sym: Symbol)(implicit ctx: Context): lsp4j.CompletionItemKind = {
       import lsp4j.{CompletionItemKind => CIK}
 
-      if sym.is(Package) || sym.is(Module)
+      if sym.is(Package) || sym.is(Module) then
         CIK.Module // No CompletionItemKind.Package (https://github.com/Microsoft/language-server-protocol/issues/155)
-      else if sym.isConstructor
+      else if sym.isConstructor then
         CIK.Constructor
-      else if sym.isClass
+      else if sym.isClass then
         CIK.Class
-      else if sym.is(Mutable)
+      else if sym.is(Mutable) then
         CIK.Variable
-      else if sym.is(Method)
+      else if sym.is(Method) then
         CIK.Method
       else
         CIK.Field