1 files changed, 69 insertions, 0 deletions
diff --git a/src/client/elm/Model/Translations.elm b/src/client/elm/Model/Translations.elm
new file mode 100644
index 0000000..bec8c9b
--- /dev/null
+++ b/src/client/elm/Model/Translations.elm
@@ -0,0 +1,69 @@
+module Model.Translations
+  ( translationsDecoder
+  , Translations
+  , Translation
+  , getMessage
+  , getParamMessage
+  ) where
+
+import Maybe exposing (withDefault)
+import Json.Decode as Json exposing ((:=))
+import String
+
+type alias Translations = List Translation
+
+translationsDecoder : Json.Decoder Translations
+translationsDecoder = Json.list translationDecoder
+
+type alias Translation =
+  { key : String
+  , message : List MessagePart
+  }
+
+getTranslation : String -> Translations -> Maybe (List MessagePart)
+getTranslation key translations =
+  translations
+    |> List.filter (\translation -> translation.key == key)
+    |> List.head
+    |> Maybe.map .message
+
+translationDecoder : Json.Decoder Translation
+translationDecoder =
+  Json.object2 Translation
+    ("key" := Json.string)
+    ("message" := Json.list partDecoder)
+
+type MessagePart =
+  Order Int
+  | Str String
+
+partDecoder : Json.Decoder MessagePart
+partDecoder =
+  ("tag" := Json.string) `Json.andThen` partDecoderWithTag
+
+partDecoderWithTag : String -> Json.Decoder MessagePart
+partDecoderWithTag tag =
+  case tag of
+    "Order" -> Json.object1 Order ("contents" := Json.int)
+    "Str" -> Json.object1 Str ("contents" := Json.string)
+
+-----
+
+getMessage : String -> Translations -> String
+getMessage = getParamMessage []
+
+getParamMessage : List String -> String -> Translations -> String
+getParamMessage values key translations =
+  getTranslation key translations
+    |> Maybe.map (\parts -> String.concat (List.map (replacePart values) parts))
+    |> withDefault key
+
+replacePart : List String -> MessagePart -> String
+replacePart values part =
+  case part of
+    Str str -> str
+    Order n ->
+      values
+        |> List.drop (n - 1)
+        |> List.head
+        |> withDefault ("{" ++ (toString n) ++ "}")