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module Abs where
import Parser.AbsSchmim
import Data.Map.Lazy
type Env = Map Ident Val
data Val
= VNum Integer
| VAbs Ident Type Env Exp
| VTr
| VFl
| VVrnt Ident Val Type
| VTpl [Val]
| VNil Type
| VCons Val Val
deriving (Eq, Ord, Read)
instance Show Val where
show (VNum n) = show n
show (VAbs x t _ _) = "#(lambda " ++ (show x) ++ " : " ++ (show t) ++ ")"
show (VTr) = "true"
show (VFl) = "false"
show (VVrnt (Ident l) v _) = "<" ++ l ++ " " ++ (show v) ++ ">"
show (VTpl vs) = "{" ++ (show' vs) ++ "}"
show (VNil t) = "nil"
show (VCons v1 v2) = "(cons " ++ (show v1) ++ " " ++ (show v2) ++ ")"
show' = cleanup . Prelude.foldl (\s v -> s ++ (show v) ++ ", ") ""
where cleanup [] = ""
cleanup l = init $ init l
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