compile language DB to AnyRefMap, for runtime speed

modules/i18n/src/main/JsDump.scala

@@ -69,12 +69,15 @@ object JsDump {
     }
   }
 
-  def dbToObject(ref: I18nDb.Ref, lang: Lang): JsObject = JsObject {
+  val emptyMessages: MessageMap = scala.collection.mutable.AnyRefMap.empty
+
+  def dbToObject(ref: I18nDb.Ref, lang: Lang): JsObject =
     I18nDb(ref).get(defaultLang) ?? { defaultMsgs =>
-      val msgs = ~I18nDb(ref).get(lang)
-      defaultMsgs.flatMap {
-        case (k, v) => translatedJs(k, msgs get k getOrElse v, lang)
+      JsObject {
+        val msgs = I18nDb(ref).get(lang) | emptyMessages
+        defaultMsgs.flatMap {
+          case (k, v) => translatedJs(k, msgs get k getOrElse v, lang)
+        }
       }
     }
-  }
 }

modules/i18n/src/main/package.scala

@@ -6,7 +6,12 @@ package object i18n extends PackageObject with WithPlay {
 
   type Count = Int
   type MessageKey = String
-  private[i18n]type Messages = Map[Lang, Map[MessageKey, Translation]]
+
+  /* of course we don't need/use the mutability
+   * it's just that AnyRefMap is the fastest scala hashmap implementation
+   */
+  private[i18n]type MessageMap = scala.collection.mutable.AnyRefMap[MessageKey, Translation]
+  private[i18n]type Messages = Map[Lang, MessageMap]
 
   private[i18n] def logger = lila.log("i18n")
 

project/MessageCompiler.scala

@@ -56,7 +56,7 @@ import play.api.i18n.Lang
 // format: OFF
 private[i18n] object Registry {
 
-  def load = Map[Lang, Map[MessageKey, Translation]]($content)
+  def load = Map[Lang, scala.collection.mutable.AnyRefMap[MessageKey, Translation]]($content)
 }
 """
     }
@@ -96,7 +96,7 @@ import I18nQuantity._
 // format: OFF
 private object `$locale` {
 
-  def load = Map[MessageKey, Translation](\n${content mkString ",\n"})
+  def load = scala.collection.mutable.AnyRefMap[MessageKey, Translation](\n${content mkString ",\n"})
 }
 """
   }