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83 lines
2.7 KiB
Haskell
83 lines
2.7 KiB
Haskell
----------------------------------------------------------------------
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-- |
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-- Module : GrammarToTransfer
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-- Maintainer : Björn Bringert
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-- Stability : (stable)
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-- Portability : (portable)
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--
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-- > CVS $Date: 2005/06/17 12:39:07 $
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-- > CVS $Author: bringert $
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-- > CVS $Revision: 1.8 $
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--
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-- Creates a data type definition in the transfer language
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-- for an abstract module.
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-----------------------------------------------------------------------------
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module GF.API.GrammarToTransfer (grammar2transfer) where
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import qualified GF.Canon.GFC as GFC
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import qualified GF.Grammar.Abstract as A
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import GF.Grammar.Macros
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import GF.Infra.Modules
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import GF.Data.Operations
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import Transfer.Core.Abs as C
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import Transfer.Core.Print
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-- | the main function
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grammar2transfer :: GFC.CanonGrammar -> String
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grammar2transfer gr = printTree $ C.Module [cats2cat cat tree cats, funs2tree cat tree funs]
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where
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cat = C.CIdent "Cat" -- FIXME
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tree = C.CIdent "Tree" -- FIXME
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defs = concat [tree2list (jments m) | im@(_,ModMod m) <- modules gr, isModAbs m]
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-- get category name and context
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cats = [(cat, c) | (cat,GFC.AbsCat c _) <- defs]
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-- get function name and type
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funs = [(fun, typ) | (fun,GFC.AbsFun typ _) <- defs]
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name = ifNull "UnknownModule" (symid . last) [n | (n,ModMod m) <- modules gr, isModAbs m]
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-- | Create a declaration of the type of categories given a list
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-- of category names and their contexts.
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cats2cat :: CIdent -- ^ the name of the Cat type
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-> CIdent -- ^ the name of the Tree type
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-> [(A.Ident,A.Context)] -> Decl
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cats2cat cat tree = C.DataDecl cat C.EType . map (uncurry catCons)
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where
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catCons i c = C.ConsDecl (id2id i) (addTree tree $ catConsType c)
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catConsType = foldr pi (C.EVar cat)
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pi (i,x) t = C.EPi (id2pv i) (term2exp x) t
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funs2tree :: CIdent -- ^ the name of the Cat type
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-> CIdent -- ^ the name of the Tree type
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-> [(A.Ident,A.Type)] -> Decl
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funs2tree cat tree =
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C.DataDecl tree (C.EPi C.PVWild (EVar cat) C.EType) . map (uncurry funCons)
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where
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funCons i t = C.ConsDecl (id2id i) (addTree tree $ term2exp t)
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term2exp :: A.Term -> C.Exp
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term2exp t = case t of
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A.Vr i -> C.EVar (id2id i)
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A.App t1 t2 -> C.EApp (term2exp t1) (term2exp t2)
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A.Abs i t1 -> C.EAbs (id2pv i) (term2exp t1)
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A.Prod i t1 t2 -> C.EPi (id2pv i) (term2exp t1) (term2exp t2)
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A.Q m i -> C.EVar (id2id i)
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_ -> error $ "term2exp: can't handle " ++ show t
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id2id :: A.Ident -> C.CIdent
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id2id = CIdent . symid
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id2pv :: A.Ident -> PatternVariable
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id2pv = C.PVVar . id2id
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-- FIXME: I think this is not general enoguh.
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addTree :: CIdent -> C.Exp -> C.Exp
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addTree tree x = case x of
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C.EPi i t e -> C.EPi i (addTree tree t) (addTree tree e)
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e -> C.EApp (C.EVar tree) e |