command language and gfcc term parser in bnfc

src/GF/Command/PPrTree.hs

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+module GF.Command.PPrTree (pTree, prExp) where
+
+import GF.GFCC.AbsGFCC
+import GF.GFCC.Macros
+import qualified GF.Command.ParGFShell as P
+import GF.Command.PrintGFShell
+import GF.Command.AbsGFShell
+import GF.Command.ErrM
+
+pTree :: String -> Exp
+pTree s = case P.pTree (P.myLexer s) of
+  Ok t -> tree2exp t
+  Bad s -> error s
+
+tree2exp t = case t of
+  TApp f ts -> tree (AC (i2i f)) (map tree2exp ts)  
+  TAbs xs t -> DTr (map i2i xs ++ ys) f ts where DTr ys f ts = tree2exp t 
+  TId c     -> tree (AC (i2i c)) [] 
+  TInt i    -> tree (AI i) []
+--  TStr s
+--  TFloat d -> 
+ where
+   i2i (Ident s) = CId s
+
+prExp :: Exp -> String
+prExp = printTree . exp2tree
+
+exp2tree (DTr xs at ts) = tabs (map i4i xs) (tapp at (map exp2tree ts)) 
+  where
+    tabs [] t = t
+    tabs ys t = TAbs ys t
+    tapp (AC f) [] = TId (i4i f)
+    tapp (AC f) vs = TApp (i4i f) vs
+    tapp (AI i) [] = TInt i
+    i4i (CId s) = Ident s