modernized parser in EmbedAPI

examples/tutorial/embedded/haskell/Run.hs

@@ -0,0 +1,38 @@
+module Main where
+
+import GSyntax
+import GF.Embed.EmbedAPI
+
+main :: IO () 
+main = do
+  gr <- file2grammar "math.gfcm"
+  loop gr
+
+loop :: MultiGrammar -> IO ()
+loop gr = do
+  s <- getLine
+  interpret gr s
+  loop gr
+
+interpret :: MultiGrammar -> String -> IO ()
+interpret gr s = do
+  let ltss = parseAllLang gr "Question" s
+  case ltss of
+    [] ->  putStrLn "no parse"
+    (l,t:_):_ -> putStrLn $ linearize gr l $ gf $ answer $ fg t
+
+answer :: GQuestion -> GAnswer
+answer p = case p of
+  GOdd x   -> test odd x
+  GEven x  -> test even x
+  GPrime x -> test prime x
+
+value :: GObject -> Int
+value e = case e of
+  GNumber (GInt i) -> fromInteger i
+
+test :: (Int -> Bool) -> GObject -> GAnswer
+test f x = if f (value x) then GYes else GNo
+
+prime :: Int -> Bool
+prime = (< 8) ----