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|
module Library.Object (
Object(..),
objNum,
objName,
objList,
objTyOp,
objType,
objConst,
objVar,
objTerm,
objThm,
List,
makeSubst
) where
import Data.Maybe
import Data.List
import Library.TypeVar
import Library.Term
import Library.Theorem
data Object = ObjNum Number
| ObjName Name
| ObjList List
| ObjTyOp TypeOp
| ObjType Type
| ObjConst Const
| ObjVar Var
| ObjTerm Term
| ObjThm Theorem deriving (Eq, Ord)
type List = [Object]
instance Show Object where
show (ObjNum a) = show a
show (ObjName a) = show a
show (ObjList a) = show a
show (ObjTyOp a) = show a
show (ObjType a) = show a
show (ObjConst a) = show a
show (ObjVar a) = show a
show (ObjTerm a) = show a
show (ObjThm a) = show a
makeSubst :: [Object] -> Maybe Substitution
makeSubst l =
let list = (map (mapMaybe objList)) . (mapMaybe objList) $ l
f g h x = (g . head $ x, h . last $ x)
check = f (map (f objName objType)) (map (f objVar objTerm)) list
g = all (\x -> (isJust . fst $ x) && (isJust . snd $ x))
h x = (fromJust . fst $ x, fromJust . snd $ x)
in if ((g . fst $ check) && (g . snd $ check))
then Just (map h (fst check), map h (snd check))
else Nothing
objNum :: Object -> Maybe Number
objNum obj =
case (obj) of
(ObjNum n) -> Just n
(_) -> Nothing
objName :: Object -> Maybe Name
objName obj =
case (obj) of
(ObjName n) -> Just n
(_) -> Nothing
objList :: Object -> Maybe List
objList obj =
case (obj) of
(ObjList l) -> Just l
(_) -> Nothing
objTyOp :: Object -> Maybe TypeOp
objTyOp obj =
case (obj) of
(ObjTyOp tyop) -> Just tyop
(_) -> Nothing
objType :: Object -> Maybe Type
objType obj =
case (obj) of
(ObjType ty) -> Just ty
(_) -> Nothing
objConst :: Object -> Maybe Const
objConst obj =
case (obj) of
(ObjConst c) -> Just c
(_) -> Nothing
objVar :: Object -> Maybe Var
objVar obj =
case (obj) of
(ObjVar var) -> Just var
(_) -> Nothing
objTerm :: Object -> Maybe Term
objTerm obj =
case (obj) of
(ObjTerm term) -> Just term
(_) -> Nothing
objThm :: Object -> Maybe Theorem
objThm obj =
case (obj) of
(ObjThm thm) -> Just thm
(_) -> Nothing
|
