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https://github.com/GrammaticalFramework/gf-core.git
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84 lines
2.4 KiB
Haskell
84 lines
2.4 KiB
Haskell
module PGF.Linearize where
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import PGF.CId
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import PGF.Data
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import PGF.Macros
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import qualified Data.Map as Map
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import Data.List
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import Debug.Trace
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-- linearization and computation of concrete PGF Terms
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linearize :: PGF -> CId -> Exp -> String
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linearize pgf lang = realize . linExp pgf lang
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realize :: Term -> String
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realize trm = case trm of
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R ts -> realize (ts !! 0)
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S ss -> unwords $ map realize ss
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K t -> case t of
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KS s -> s
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KP s _ -> unwords s ---- prefix choice TODO
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W s t -> s ++ realize t
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FV ts -> realize (ts !! 0) ---- other variants TODO
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TM s -> s
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_ -> "ERROR " ++ show trm ---- debug
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linExp :: PGF -> CId -> Exp -> Term
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linExp pgf lang = lin
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where
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lin (EAbs xs e ) = case lin e of
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R ts -> R $ ts ++ (Data.List.map (kks . prCId) xs)
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TM s -> R $ (TM s) : (Data.List.map (kks . prCId) xs)
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lin (EApp fun es) = comp (map lin es) $ look fun
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lin (EStr s ) = R [kks (show s)] -- quoted
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lin (EInt i ) = R [kks (show i)]
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lin (EFloat d ) = R [kks (show d)]
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lin (EVar x ) = TM (prCId x)
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lin (EMeta i ) = TM (show i)
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comp = compute pgf lang
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look = lookLin pgf lang
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compute :: PGF -> CId -> [Term] -> Term -> Term
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compute pgf lang args = comp where
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comp trm = case trm of
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P r p -> proj (comp r) (comp p)
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W s t -> W s (comp t)
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R ts -> R $ map comp ts
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V i -> idx args i -- already computed
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F c -> comp $ look c -- not computed (if contains argvar)
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FV ts -> FV $ map comp ts
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S ts -> S $ filter (/= S []) $ map comp ts
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_ -> trm
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look = lookOper pgf lang
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idx xs i = if i > length xs - 1
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then trace
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("too large " ++ show i ++ " for\n" ++ unlines (map show xs) ++ "\n") tm0
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else xs !! i
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proj r p = case (r,p) of
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(_, FV ts) -> FV $ map (proj r) ts
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(FV ts, _ ) -> FV $ map (\t -> proj t p) ts
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(W s t, _) -> kks (s ++ getString (proj t p))
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_ -> comp $ getField r (getIndex p)
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getString t = case t of
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K (KS s) -> s
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_ -> error ("ERROR in grammar compiler: string from "++ show t) "ERR"
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getIndex t = case t of
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C i -> i
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TM _ -> 0 -- default value for parameter
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_ -> trace ("ERROR in grammar compiler: index from " ++ show t) 666
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getField t i = case t of
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R rs -> idx rs i
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TM s -> TM s
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_ -> error ("ERROR in grammar compiler: field from " ++ show t) t
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