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|
{-# LANGUAGE PatternGuards #-}
----------------------------------------------------------------------
-- |
-- Module : Lookup
-- Maintainer : AR
-- Stability : (stable)
-- Portability : (portable)
--
-- > CVS $Date: 2005/10/27 13:21:53 $
-- > CVS $Author: aarne $
-- > CVS $Revision: 1.15 $
--
-- Lookup in source (concrete and resource) when compiling.
--
-- lookup in resource and concrete in compiling; for abstract, use 'Look'
-----------------------------------------------------------------------------
module GF.Grammar.Lookup (
lookupIdent,
lookupIdentInfo,
lookupOrigInfo,
allOrigInfos,
lookupResDef,
lookupResType,
lookupOverload,
lookupParamValues,
allParamValues,
lookupAbsDef,
lookupLincat,
lookupFunType,
lookupCatContext
) where
import GF.Data.Operations
import GF.Infra.Ident
import GF.Infra.Modules
import GF.Grammar.Macros
import GF.Grammar.Grammar
import GF.Grammar.Printer
import GF.Grammar.Predef
import GF.Grammar.Lockfield
import Data.List (nub,sortBy)
import Control.Monad
import Text.PrettyPrint
-- whether lock fields are added in reuse
lock c = lockRecType c -- return
unlock c = unlockRecord c -- return
-- to look up a constant etc in a search tree --- why here? AR 29/5/2008
lookupIdent :: Ident -> BinTree Ident b -> Err b
lookupIdent c t =
case lookupTree showIdent c t of
Ok v -> return v
Bad _ -> Bad ("unknown identifier" +++ showIdent c)
lookupIdentInfo :: ModInfo Ident a -> Ident -> Err a
lookupIdentInfo mo i = lookupIdent i (jments mo)
lookupResDef :: SourceGrammar -> Ident -> Ident -> Err Term
lookupResDef gr m c
| isPredefCat c = lock c defLinType
| otherwise = look m c
where
look m c = do
mo <- lookupModule gr m
info <- lookupIdentInfo mo c
case info of
ResOper _ (Just t) -> return t
ResOper _ Nothing -> return (Q m c)
CncCat (Just ty) _ _ -> lock c ty
CncCat _ _ _ -> lock c defLinType
CncFun (Just (cat,_,_)) (Just tr) _ -> unlock cat tr
CncFun _ (Just tr) _ -> return tr
AnyInd _ n -> look n c
ResParam _ _ -> return (QC m c)
ResValue _ -> return (QC m c)
_ -> Bad $ render (ppIdent c <+> text "is not defined in resource" <+> ppIdent m)
lookupResType :: SourceGrammar -> Ident -> Ident -> Err Type
lookupResType gr m c = do
mo <- lookupModule gr m
info <- lookupIdentInfo mo c
case info of
ResOper (Just t) _ -> return t
-- used in reused concrete
CncCat _ _ _ -> return typeType
CncFun (Just (cat,cont,val)) _ _ -> do
val' <- lock cat val
return $ mkProd cont val' []
AnyInd _ n -> lookupResType gr n c
ResParam _ _ -> return typePType
ResValue t -> return t
_ -> Bad $ render (ppIdent c <+> text "has no type defined in resource" <+> ppIdent m)
lookupOverload :: SourceGrammar -> Ident -> Ident -> Err [([Type],(Type,Term))]
lookupOverload gr m c = do
mo <- lookupModule gr m
info <- lookupIdentInfo mo c
case info of
ResOverload os tysts -> do
tss <- mapM (\x -> lookupOverload gr x c) os
return $ [let (args,val) = typeFormCnc ty in (map (\(b,x,t) -> t) args,(val,tr)) |
(ty,tr) <- tysts] ++
concat tss
AnyInd _ n -> lookupOverload gr n c
_ -> Bad $ render (ppIdent c <+> text "is not an overloaded operation")
-- | returns the original 'Info' and the module where it was found
lookupOrigInfo :: SourceGrammar -> Ident -> Ident -> Err (Ident,Info)
lookupOrigInfo gr m c = do
mo <- lookupModule gr m
info <- lookupIdentInfo mo c
case info of
AnyInd _ n -> lookupOrigInfo gr n c
i -> return (m,i)
allOrigInfos :: SourceGrammar -> Ident -> [(Ident,Info)]
allOrigInfos gr m = errVal [] $ do
mo <- lookupModule gr m
return [(c,i) | (c,_) <- tree2list (jments mo), Ok (_,i) <- [look c]]
where
look = lookupOrigInfo gr m
lookupParamValues :: SourceGrammar -> Ident -> Ident -> Err [Term]
lookupParamValues gr m c = do
(_,info) <- lookupOrigInfo gr m c
case info of
ResParam _ (Just pvs) -> return pvs
_ -> Bad $ render (ppIdent c <+> text "has no parameter values defined in resource" <+> ppIdent m)
allParamValues :: SourceGrammar -> Type -> Err [Term]
allParamValues cnc ptyp = case ptyp of
_ | Just n <- isTypeInts ptyp -> return [EInt i | i <- [0..n]]
QC p c -> lookupParamValues cnc p c
Q p c -> lookupResDef cnc p c >>= allParamValues cnc
RecType r -> do
let (ls,tys) = unzip $ sortByFst r
tss <- mapM (allParamValues cnc) tys
return [R (zipAssign ls ts) | ts <- combinations tss]
_ -> Bad (render (text "cannot find parameter values for" <+> ppTerm Unqualified 0 ptyp))
where
-- to normalize records and record types
sortByFst = sortBy (\ x y -> compare (fst x) (fst y))
lookupAbsDef :: SourceGrammar -> Ident -> Ident -> Err (Maybe Int,Maybe [Equation])
lookupAbsDef gr m c = errIn (render (text "looking up absdef of" <+> ppIdent c)) $ do
mo <- lookupModule gr m
info <- lookupIdentInfo mo c
case info of
AbsFun _ a d -> return (a,d)
AnyInd _ n -> lookupAbsDef gr n c
_ -> return (Nothing,Nothing)
lookupLincat :: SourceGrammar -> Ident -> Ident -> Err Type
lookupLincat gr m c | isPredefCat c = return defLinType --- ad hoc; not needed?
lookupLincat gr m c = do
mo <- lookupModule gr m
info <- lookupIdentInfo mo c
case info of
CncCat (Just t) _ _ -> return t
AnyInd _ n -> lookupLincat gr n c
_ -> Bad (render (ppIdent c <+> text "has no linearization type in" <+> ppIdent m))
-- | this is needed at compile time
lookupFunType :: SourceGrammar -> Ident -> Ident -> Err Type
lookupFunType gr m c = do
mo <- lookupModule gr m
info <- lookupIdentInfo mo c
case info of
AbsFun (Just t) _ _ -> return t
AnyInd _ n -> lookupFunType gr n c
_ -> Bad (render (text "cannot find type of" <+> ppIdent c))
-- | this is needed at compile time
lookupCatContext :: SourceGrammar -> Ident -> Ident -> Err Context
lookupCatContext gr m c = do
mo <- lookupModule gr m
info <- lookupIdentInfo mo c
case info of
AbsCat (Just co) _ -> return co
AnyInd _ n -> lookupCatContext gr n c
_ -> Bad (render (text "unknown category" <+> ppIdent c))
|
