forked from GitHub/gf-core
146 lines
5.8 KiB
Haskell
146 lines
5.8 KiB
Haskell
----------------------------------------------------------------------
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-- |
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-- Maintainer : PL
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-- Stability : (stable)
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-- Portability : (portable)
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--
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-- > CVS $Date: 2005/04/14 11:42:05 $
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-- > CVS $Author: peb $
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-- > CVS $Revision: 1.3 $
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--
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-- Converting GFC to SimpleGFC
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--
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-- the conversion might fail if the GFC grammar has dependent or higher-order types
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-----------------------------------------------------------------------------
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module GF.Conversion.GFCtoSimple
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(convertGrammar) where
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import qualified AbsGFC as A
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import qualified Ident as I
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import GF.Formalism.GCFG
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import GF.Formalism.SimpleGFC
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import GF.Conversion.Types
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import GFC (CanonGrammar)
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import MkGFC (grammar2canon)
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import qualified Look (lookupLin, allParamValues, lookupLincat)
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import qualified CMacros (defLinType)
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import Operations (err, errVal)
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--import qualified Modules as M
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import GF.System.Tracing
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import GF.Infra.Print
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----------------------------------------------------------------------
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type Env = (CanonGrammar, I.Ident)
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convertGrammar :: Env -> SGrammar
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convertGrammar gram = trace2 "converting language" (show (snd gram)) $
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tracePrt "#simpleGFC rules" (show . length) $
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[ convertAbsFun gram fun typing |
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A.Mod (A.MTAbs modname) _ _ _ defs <- modules,
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A.AbsDFun fun typing _ <- defs ]
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where A.Gr modules = grammar2canon (fst gram)
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convertAbsFun :: Env -> I.Ident -> A.Exp -> SRule
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convertAbsFun gram fun typing = Rule abs cnc
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where abs = convertAbstract [] fun typing
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cnc = convertConcrete gram abs
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----------------------------------------------------------------------
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-- abstract definitions
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convertAbstract :: [SDecl] -> Fun -> A.Exp -> Abstract SDecl Name
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convertAbstract env fun (A.EProd x a b)
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= convertAbstract (convertType x' [] a : env) fun b
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where x' = if x==I.identC "h_" then anyVar else x
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convertAbstract env fun a
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= Abs (convertType anyVar [] a) (reverse env) name
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where name = Name fun [ Unify [n] | n <- [0 .. length env-1] ]
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convertType :: Var -> [TTerm] -> A.Exp -> SDecl
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convertType x args (A.EApp a b) = convertType x (convertExp [] b : args) a
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convertType x args (A.EAtom at) = Decl x (convertCat at) args
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convertType x args exp = error $ "convertType: " ++ prt exp
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convertExp :: [TTerm] -> A.Exp -> TTerm
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convertExp args (A.EAtom at) = convertAtom args at
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convertExp args (A.EApp a b) = convertExp (convertExp [] b : args) a
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convertExp args exp = error $ "convertExp: " ++ prt exp
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convertAtom :: [TTerm] -> A.Atom -> TTerm
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convertAtom args (A.AC con) = con :@ reverse args
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convertAtom [] (A.AV var) = TVar var
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convertAtom args atom = error $ "convertAtom: " ++ prt args ++ " " ++ prt atom
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convertCat :: A.Atom -> SCat
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convertCat (A.AC (A.CIQ _ cat)) = cat
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convertCat atom = error $ "convertCat: " ++ show atom
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----------------------------------------------------------------------
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-- concrete definitions
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convertConcrete :: Env -> Abstract SDecl Name -> Concrete SLinType (Maybe STerm)
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convertConcrete gram (Abs decl args name) = Cnc ltyp largs term
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where term = fmap (convertTerm gram) $ lookupLin gram $ name2fun name
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ltyp : largs = map (convertCType gram . lookupCType gram) (decl : args)
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convertCType :: Env -> A.CType -> SLinType
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convertCType gram (A.RecType rec)
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= RecT [ (lbl, convertCType gram ctype) | A.Lbg lbl ctype <- rec ]
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convertCType gram (A.Table ptype vtype)
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= TblT (convertCType gram ptype) (convertCType gram vtype)
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convertCType gram ct@(A.Cn con) = ConT con $ map (convertTerm gram) $ groundTerms gram ct
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convertCType gram (A.TStr) = StrT
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convertCType gram (A.TInts n) = error "convertCType: cannot handle 'TInts' constructor"
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convertTerm :: Env -> A.Term -> STerm
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convertTerm gram (A.Arg arg) = convertArgVar arg
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convertTerm gram (A.Con con terms) = con :^ map (convertTerm gram) terms
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convertTerm gram (A.LI var) = Var var
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convertTerm gram (A.R rec) = Rec [ (lbl, convertTerm gram term) | A.Ass lbl term <- rec ]
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convertTerm gram (A.P term lbl) = convertTerm gram term +. lbl
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convertTerm gram (A.V ctype terms) = Tbl [ (convertTerm gram pat, convertTerm gram term) |
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(pat, term) <- zip (groundTerms gram ctype) terms ]
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convertTerm gram (A.T ctype tbl) = Tbl [ (convertPatt pat, convertTerm gram term) |
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A.Cas pats term <- tbl, pat <- pats ]
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convertTerm gram (A.S term sel) = convertTerm gram term +! convertTerm gram sel
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convertTerm gram (A.C term1 term2) = convertTerm gram term1 ?++ convertTerm gram term2
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convertTerm gram (A.FV terms) = variants (map (convertTerm gram) terms)
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-- 'pre' tokens are converted to variants (over-generating):
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convertTerm gram (A.K (A.KP [s] vs))
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= variants $ Token s : [ Token v | A.Var [v] _ <- vs ]
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convertTerm gram (A.K (A.KP _ _)) = error "convertTerm: don't know how to handle string lists in 'pre' tokens"
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convertTerm gram (A.K (A.KS tok)) = Token tok
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convertTerm gram (A.E) = Empty
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convertTerm gram (A.I con) = error "convertTerm: cannot handle 'I' constructor"
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convertTerm gram (A.EInt int) = error "convertTerm: cannot handle 'EInt' constructor"
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convertArgVar :: A.ArgVar -> STerm
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convertArgVar (A.A cat nr) = Arg (fromInteger nr) cat emptyPath
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convertArgVar (A.AB cat bindings nr) = Arg (fromInteger nr) cat emptyPath
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convertPatt (A.PC con pats) = con :^ map convertPatt pats
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convertPatt (A.PV x) = Var x
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convertPatt (A.PW) = Wildcard
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convertPatt (A.PR rec) = Rec [ (lbl, convertPatt pat) | A.PAss lbl pat <- rec ]
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convertPatt (A.PI n) = error "convertPatt: cannot handle 'PI' constructor"
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----------------------------------------------------------------------
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lookupLin :: Env -> Fun -> Maybe A.Term
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lookupLin gram fun = err fail Just $
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Look.lookupLin (fst gram) (A.CIQ (snd gram) fun)
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lookupCType :: Env -> SDecl -> A.CType
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lookupCType env decl
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= errVal CMacros.defLinType $
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Look.lookupLincat (fst env) (A.CIQ (snd env) (decl2cat decl))
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groundTerms :: Env -> A.CType -> [A.Term]
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groundTerms gram ctype = err error id $
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Look.allParamValues (fst gram) ctype
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