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|
----------------------------------------------------------------------
-- |
-- Module : LookAbs
-- Maintainer : AR
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/04/28 16:42:48 $
-- > CVS $Author: aarne $
-- > CVS $Revision: 1.14 $
--
-- (Description of the module)
-----------------------------------------------------------------------------
module GF.Grammar.LookAbs (GFCGrammar,
lookupAbsDef,
lookupFunType,
lookupCatContext,
lookupTransfer,
isPrimitiveFun,
lookupRef,
refsForType,
funRulesOf,
hasHOAS,
allCatsOf,
allBindCatsOf,
funsForType,
funsOnType,
funsOnTypeFs,
allDefs,
lookupFunTypeSrc,
lookupCatContextSrc
) where
import GF.Data.Operations
import qualified GF.Canon.GFC as C
import GF.Grammar.Abstract
import GF.Infra.Ident
import GF.Infra.Modules
import Data.List (nub)
import Control.Monad
type GFCGrammar = C.CanonGrammar
lookupAbsDef :: GFCGrammar -> Ident -> Ident -> Err (Maybe Term)
lookupAbsDef gr m c = errIn ("looking up absdef of" +++ prt c) $ do
mi <- lookupModule gr m
case mi of
ModMod mo -> do
info <- lookupIdentInfo mo c
case info of
C.AbsFun _ t -> return $ return t
C.AnyInd _ n -> lookupAbsDef gr n c
_ -> return Nothing
_ -> Bad $ prt m +++ "is not an abstract module"
lookupFunType :: GFCGrammar -> Ident -> Ident -> Err Type
lookupFunType gr m c = errIn ("looking up funtype of" +++ prt c +++ "in module" +++ prt m) $ do
mi <- lookupModule gr m
case mi of
ModMod mo -> do
info <- lookupIdentInfo mo c
case info of
C.AbsFun t _ -> return t
C.AnyInd _ n -> lookupFunType gr n c
_ -> prtBad "cannot find type of" c
_ -> Bad $ prt m +++ "is not an abstract module"
lookupCatContext :: GFCGrammar -> Ident -> Ident -> Err Context
lookupCatContext gr m c = errIn ("looking up context of cat" +++ prt c) $ do
mi <- lookupModule gr m
case mi of
ModMod mo -> do
info <- lookupIdentInfo mo c
case info of
C.AbsCat co _ -> return co
C.AnyInd _ n -> lookupCatContext gr n c
_ -> prtBad "unknown category" c
_ -> Bad $ prt m +++ "is not an abstract module"
-- | lookup for transfer function: transfer-module-name, category name
lookupTransfer :: GFCGrammar -> Ident -> Ident -> Err Term
lookupTransfer gr m c = errIn ("looking up transfer of cat" +++ prt c) $ do
mi <- lookupModule gr m
case mi of
ModMod mo -> do
info <- lookupIdentInfo mo c
case info of
C.AbsTrans t -> return t
C.AnyInd _ n -> lookupTransfer gr n c
_ -> prtBad "cannot transfer function for" c
_ -> Bad $ prt m +++ "is not a transfer module"
-- | should be revised (20\/9\/2003)
isPrimitiveFun :: GFCGrammar -> Fun -> Bool
isPrimitiveFun gr (m,c) = case lookupAbsDef gr m c of
Ok (Just (Eqs [])) -> True -- is canonical
Ok (Just _) -> False -- has defining clauses
_ -> True -- has no definition
-- | looking up refinement terms
lookupRef :: GFCGrammar -> Binds -> Term -> Err Val
lookupRef gr binds at = case at of
Q m f -> lookupFunType gr m f >>= return . vClos
Vr i -> maybeErr ("unknown variable" +++ prt at) $ lookup i binds
EInt _ -> return valAbsInt
EFloat _ -> return valAbsFloat
K _ -> return valAbsString
_ -> prtBad "cannot refine with complex term" at ---
refsForType :: (Val -> Type -> Bool) -> GFCGrammar -> Binds -> Val -> [(Term,(Val,Bool))]
refsForType compat gr binds val =
-- bound variables --- never recursive?
[(vr i, (t,False)) | (i,t) <- binds, Ok ty <- [val2exp t], compat val ty] ++
-- integer and string literals
[(EInt i, (val,False)) | val == valAbsInt, i <- [0,1,2,5,11,1978]] ++
[(EFloat i, (val,False)) | val == valAbsFloat, i <- [3.1415926]] ++
[(K s, (val,False)) | val == valAbsString, s <- ["foo", "NN", "x"]] ++
-- functions defined in the current abstract syntax
[(qq f, (vClos t,isRecursiveType t)) | (f,t) <- funsForType compat gr val]
funRulesOf :: GFCGrammar -> [(Fun,Type)]
funRulesOf gr =
---- funRulesForLiterals ++
[((i,f),typ) | (i, ModMod m) <- modules gr,
mtype m == MTAbstract,
(f, C.AbsFun typ _) <- tree2list (jments m)]
-- testing for higher-order abstract syntax
hasHOAS :: GFCGrammar -> Bool
hasHOAS gr = any isHigherOrderType [t | (_,t) <- funRulesOf gr] where
allCatsOf :: GFCGrammar -> [(Cat,Context)]
allCatsOf gr =
[((i,c),cont) | (i, ModMod m) <- modules gr,
isModAbs m,
(c, C.AbsCat cont _) <- tree2list (jments m)]
allBindCatsOf :: GFCGrammar -> [Cat]
allBindCatsOf gr =
nub [c | (i, ModMod m) <- modules gr,
isModAbs m,
(c, C.AbsFun typ _) <- tree2list (jments m),
Ok (cont,_) <- [firstTypeForm typ],
c <- concatMap fst $ errVal [] $ mapM (catSkeleton . snd) cont
]
funsForType :: (Val -> Type -> Bool) -> GFCGrammar -> Val -> [(Fun,Type)]
funsForType compat gr val = [(fun,typ) | (fun,typ) <- funRulesOf gr,
compat val typ]
funsOnType :: (Val -> Type -> Bool) -> GFCGrammar -> Val -> [((Fun,Int),Type)]
funsOnType compat gr = funsOnTypeFs compat (funRulesOf gr)
funsOnTypeFs :: (Val -> Type -> Bool) -> [(Fun,Type)] -> Val -> [((Fun,Int),Type)]
funsOnTypeFs compat fs val = [((fun,i),typ) |
(fun,typ) <- fs,
Ok (args,_,_) <- [typeForm typ],
(i,arg) <- zip [0..] (map snd args),
compat val arg]
allDefs :: GFCGrammar -> [(Fun,Term)]
allDefs gr = [((i,c),d) | (i, ModMod m) <- modules gr,
isModAbs m,
(c, C.AbsFun _ d) <- tree2list (jments m)]
-- | this is needed at compile time
lookupFunTypeSrc :: Grammar -> Ident -> Ident -> Err Type
lookupFunTypeSrc gr m c = do
mi <- lookupModule gr m
case mi of
ModMod mo -> do
info <- lookupIdentInfo mo c
case info of
AbsFun (Yes t) _ -> return t
AnyInd _ n -> lookupFunTypeSrc gr n c
_ -> prtBad "cannot find type of" c
_ -> Bad $ prt m +++ "is not an abstract module"
-- | this is needed at compile time
lookupCatContextSrc :: Grammar -> Ident -> Ident -> Err Context
lookupCatContextSrc gr m c = do
mi <- lookupModule gr m
case mi of
ModMod mo -> do
info <- lookupIdentInfo mo c
case info of
AbsCat (Yes co) _ -> return co
AnyInd _ n -> lookupCatContextSrc gr n c
_ -> prtBad "unknown category" c
_ -> Bad $ prt m +++ "is not an abstract module"
|
