modernized parser in EmbedAPI

examples/tutorial/embedded/TransferLoop.hs

@@ -0,0 +1,41 @@
+module Main where
+
+import GF.Embed.EmbedAPI
+import GSyntax
+
+main :: IO () 
+main = do
+  gr <- file2grammar "math.gfcm"
+  loop (translate answerTree gr)
+
+loop :: (String -> String) -> IO ()
+loop trans = do 
+  s <- getLine
+  if s == "quit" then putStrLn "bye" else do  
+    putStrLn $ trans s
+    loop trans
+
+translate :: (Tree -> Tree) -> MultiGrammar -> String -> String
+translate tr gr = unlines . map transLine . lines where
+  transLine s = case parseAllLang gr (startCat gr) s of
+    (lg,t:_):_ -> linearize gr lg (tr t)
+    _ -> "NO PARSE"
+
+answerTree :: Tree -> Tree
+answerTree = gf . answer . fg
+
+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) ----