model for resource

examples/model/Run.hs

@@ -0,0 +1,33 @@
+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 tss = parseAll gr "Prop" s
+  case (concat tss) of
+    [] ->  putStrLn "no parse"
+    t:_ -> print $ answer $ fg t
+
+answer :: GProp -> Bool
+answer p = case p of
+  (GOdd x1) -> odd (value x1)
+  (GEven x1) -> even (value x1)
+  (GAnd x1 x2) -> answer x1 && answer x2
+
+value :: GElem -> Int
+value e = case e of
+  GZero -> 0
+