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module GF.Command.PPrTree (pTree, prExp, tree2exp) 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 -> tree (AS s) []
TFloat d -> tree (AF 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
tapp (AS i) [] = TStr i
tapp (AF i) [] = TFloat i
tapp (AM i) [] = TId (Ident "?") ----
i4i (CId s) = Ident s
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