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|
----------------------------------------------------------------------
-- |
-- Module : AppPredefined
-- Maintainer : AR
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/10/06 14:21:34 $
-- > CVS $Author: aarne $
-- > CVS $Revision: 1.13 $
--
-- Predefined function type signatures and definitions.
-----------------------------------------------------------------------------
module GF.Compile.Compute.AppPredefined (
isInPredefined, typPredefined, arrityPredefined, predefModInfo, appPredefined
) where
import GF.Infra.Ident
import GF.Infra.Modules
import GF.Infra.Option
import GF.Data.Operations
import GF.Grammar
import GF.Grammar.Predef
import qualified Data.Map as Map
import qualified Data.ByteString.Char8 as BS
import Text.PrettyPrint
import Data.Char (isUpper,toUpper,toLower)
-- predefined function type signatures and definitions. AR 12/3/2003.
isInPredefined :: Ident -> Bool
isInPredefined f = Map.member f primitives
typPredefined :: Ident -> Maybe Type
typPredefined f = case Map.lookup f primitives of
Just (ResOper (Just (L _ ty)) _) -> Just ty
Just (ResParam _ _) -> Just typePType
Just (ResValue (L _ ty)) -> Just ty
_ -> Nothing
arrityPredefined :: Ident -> Maybe Int
arrityPredefined f = do ty <- typPredefined f
let (ctxt,_) = typeFormCnc ty
return (length ctxt)
predefModInfo :: SourceModInfo
predefModInfo = ModInfo MTResource MSComplete noOptions [] Nothing [] [] primitives
primitives = Map.fromList
[ (cErrorType, ResOper (Just (noLoc typeType)) Nothing)
, (cInt , ResOper (Just (noLoc typePType)) Nothing)
, (cFloat , ResOper (Just (noLoc typePType)) Nothing)
, (cInts , fun [typeInt] typePType)
, (cPBool , ResParam (Just [noLoc (cPTrue,[]),noLoc (cPFalse,[])]) (Just [QC (cPredef,cPTrue), QC (cPredef,cPFalse)]))
, (cPTrue , ResValue (noLoc typePBool))
, (cPFalse , ResValue (noLoc typePBool))
, (cError , fun [typeStr] typeError) -- non-can. of empty set
, (cLength , fun [typeTok] typeInt)
, (cDrop , fun [typeInt,typeTok] typeTok)
, (cTake , fun [typeInt,typeTok] typeTok)
, (cTk , fun [typeInt,typeTok] typeTok)
, (cDp , fun [typeInt,typeTok] typeTok)
, (cEqInt , fun [typeInt,typeInt] typePBool)
, (cLessInt , fun [typeInt,typeInt] typePBool)
, (cPlus , fun [typeInt,typeInt] typeInt)
, (cEqStr , fun [typeTok,typeTok] typePBool)
, (cOccur , fun [typeTok,typeTok] typePBool)
, (cOccurs , fun [typeTok,typeTok] typePBool)
, (cToUpper , fun [typeTok] typeTok)
, (cToLower , fun [typeTok] typeTok)
, (cIsUpper , fun [typeTok] typePBool)
---- "read" ->
, (cRead , ResOper (Just (noLoc (mkProd -- (P : Type) -> Tok -> P
[(Explicit,varP,typePType),(Explicit,identW,typeStr)] (Vr varP) []))) Nothing)
, (cShow , ResOper (Just (noLoc (mkProd -- (P : PType) -> P -> Tok
[(Explicit,varP,typePType),(Explicit,identW,Vr varP)] typeStr []))) Nothing)
, (cToStr , ResOper (Just (noLoc (mkProd -- (L : Type) -> L -> Str
[(Explicit,varL,typeType),(Explicit,identW,Vr varL)] typeStr []))) Nothing)
, (cMapStr , ResOper (Just (noLoc (mkProd -- (L : Type) -> (Str -> Str) -> L -> L
[(Explicit,varL,typeType),(Explicit,identW,mkFunType [typeStr] typeStr),(Explicit,identW,Vr varL)] (Vr varL) []))) Nothing)
]
where
fun from to = oper (mkFunType from to)
oper ty = ResOper (Just (noLoc ty)) Nothing
noLoc = L (0,0)
varL :: Ident
varL = identC (BS.pack "L")
varP :: Ident
varP = identC (BS.pack "P")
appPredefined :: Term -> Err (Term,Bool)
appPredefined t = case t of
App f x0 -> do
(x,_) <- appPredefined x0
case f of
-- one-place functions
Q (mod,f) | mod == cPredef ->
case x of
(K s) | f == cLength -> retb $ EInt $ length s
(K s) | f == cIsUpper -> retb $ if (all isUpper s) then predefTrue else predefFalse
(K s) | f == cToUpper -> retb $ K $ map toUpper s
(K s) | f == cToLower -> retb $ K $ map toLower s
(K s) | f == cError -> retb $ Error s
_ -> retb t
-- two-place functions
App (Q (mod,f)) z0 | mod == cPredef -> do
(z,_) <- appPredefined z0
case (norm z, norm x) of
(EInt i, K s) | f == cDrop -> retb $ K (drop i s)
(EInt i, K s) | f == cTake -> retb $ K (take i s)
(EInt i, K s) | f == cTk -> retb $ K (take (max 0 (length s - i)) s)
(EInt i, K s) | f == cDp -> retb $ K (drop (max 0 (length s - i)) s)
(K s, K t) | f == cEqStr -> retb $ if s == t then predefTrue else predefFalse
(K s, K t) | f == cOccur -> retb $ if substring s t then predefTrue else predefFalse
(K s, K t) | f == cOccurs -> retb $ if any (flip elem t) s then predefTrue else predefFalse
(EInt i, EInt j) | f == cEqInt -> retb $ if i==j then predefTrue else predefFalse
(EInt i, EInt j) | f == cLessInt -> retb $ if i<j then predefTrue else predefFalse
(EInt i, EInt j) | f == cPlus -> retb $ EInt $ i+j
(_, t) | f == cShow -> retb $ foldr C Empty $ map K $ words $ render (ppTerm Unqualified 0 t)
(_, K s) | f == cRead -> retb $ Cn (identC (BS.pack s)) --- because of K, only works for atomic tags
(_, t) | f == cToStr -> trm2str t >>= retb
_ -> retb t ---- prtBad "cannot compute predefined" t
-- three-place functions
App (App (Q (mod,f)) z0) y0 | mod == cPredef -> do
(y,_) <- appPredefined y0
(z,_) <- appPredefined z0
case (z, y, x) of
(ty,op,t) | f == cMapStr -> retf $ mapStr ty op t
_ -> retb t ---- prtBad "cannot compute predefined" t
_ -> retb t ---- prtBad "cannot compute predefined" t
_ -> retb t
---- should really check the absence of arg variables
where
retb t = return (retc t,True) -- no further computing needed
retf t = return (retc t,False) -- must be computed further
retc t = case t of
K [] -> t
K s -> foldr1 C (map K (words s))
_ -> t
norm t = case t of
Empty -> K []
C u v -> case (norm u,norm v) of
(K x,K y) -> K (x +++ y)
_ -> t
_ -> t
-- read makes variables into constants
predefTrue = QC (cPredef,cPTrue)
predefFalse = QC (cPredef,cPFalse)
substring :: String -> String -> Bool
substring s t = case (s,t) of
(c:cs, d:ds) -> (c == d && substring cs ds) || substring s ds
([],_) -> True
_ -> False
trm2str :: Term -> Err Term
trm2str t = case t of
R ((_,(_,s)):_) -> trm2str s
T _ ((_,s):_) -> trm2str s
V _ (s:_) -> trm2str s
C _ _ -> return $ t
K _ -> return $ t
S c _ -> trm2str c
Empty -> return $ t
_ -> Bad (render (text "cannot get Str from term" <+> ppTerm Unqualified 0 t))
-- simultaneous recursion on type and term: type arg is essential!
-- But simplify the task by assuming records are type-annotated
-- (this has been done in type checking)
mapStr :: Type -> Term -> Term -> Term
mapStr ty f t = case (ty,t) of
_ | elem ty [typeStr,typeTok] -> App f t
(_, R ts) -> R [(l,mapField v) | (l,v) <- ts]
(Table a b,T ti cs) -> T ti [(p,mapStr b f v) | (p,v) <- cs]
_ -> t
where
mapField (mty,te) = case mty of
Just ty -> (mty,mapStr ty f te)
_ -> (mty,te)
|
