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module PGF.Raw.Convert (toPGF,fromPGF) where
import PGF.CId
import PGF.Data
import PGF.Raw.Abstract
import qualified GF.Compile.GeneratePMCFG as PMCFG
import Data.Array.IArray
import qualified Data.Map as Map
import qualified Data.Set as Set
import qualified Data.IntMap as IntMap
pgfMajorVersion, pgfMinorVersion :: Integer
(pgfMajorVersion, pgfMinorVersion) = (1,0)
-- convert parsed grammar to internal PGF
toPGF :: Grammar -> PGF
toPGF (Grm [
App "pgf" (AInt v1 : AInt v2 : App a []:cs),
App "flags" gfs,
ab@(
App "abstract" [
App "fun" fs,
App "cat" cts
]),
App "concrete" ccs
]) = let pgf = PGF {
absname = mkCId a,
cncnames = [mkCId c | App c [] <- cs],
gflags = Map.fromAscList [(mkCId f,v) | App f [AStr v] <- gfs],
abstract =
let
aflags = Map.fromAscList [(mkCId f,v) | App f [AStr v] <- gfs]
lfuns = [(mkCId f,(toType typ,toExp def)) | App f [typ, def] <- fs]
funs = Map.fromAscList lfuns
lcats = [(mkCId c, Prelude.map toHypo hyps) | App c hyps <- cts]
cats = Map.fromAscList lcats
catfuns = Map.fromAscList
[(cat,[f | (f, (DTyp _ c _,_)) <- lfuns, c==cat]) | (cat,_) <- lcats]
in Abstr aflags funs cats catfuns,
concretes = Map.fromAscList [(mkCId lang, toConcr pgf ts) | App lang ts <- ccs]
}
in pgf
where
toConcr :: PGF -> [RExp] -> Concr
toConcr pgf rexp =
let cnc = foldl add (Concr {cflags = Map.empty,
lins = Map.empty,
opers = Map.empty,
lincats = Map.empty,
lindefs = Map.empty,
printnames = Map.empty,
paramlincats = Map.empty,
parser = Just (PMCFG.convertConcrete (abstract pgf) cnc)
-- This thunk will be overwritten if there is a parser
-- compiled in the PGF file. We use lazy evaluation here
-- to make sure that buildParserOnDemand is called only
-- if it is needed.
}) rexp
in cnc
where
add :: Concr -> RExp -> Concr
add cnc (App "flags" ts) = cnc { cflags = Map.fromAscList [(mkCId f,v) | App f [AStr v] <- ts] }
add cnc (App "lin" ts) = cnc { lins = mkTermMap ts }
add cnc (App "oper" ts) = cnc { opers = mkTermMap ts }
add cnc (App "lincat" ts) = cnc { lincats = mkTermMap ts }
add cnc (App "lindef" ts) = cnc { lindefs = mkTermMap ts }
add cnc (App "printname" ts) = cnc { printnames = mkTermMap ts }
add cnc (App "param" ts) = cnc { paramlincats = mkTermMap ts }
add cnc (App "parser" ts) = cnc { parser = Just (toPInfo ts) }
toPInfo :: [RExp] -> ParserInfo
toPInfo [App "functions" fs, App "sequences" ss, App "productions" ps,App "startcats" cs] =
ParserInfo { functions = functions
, sequences = seqs
, productions = productions
, startCats = cats
}
where
functions = mkArray (map toFFun fs)
seqs = mkArray (map toFSeq ss)
productions = IntMap.fromList (map toProductionSet ps)
cats = Map.fromList [(mkCId c, (map expToInt xs)) | App c xs <- cs]
toFFun :: RExp -> FFun
toFFun (App f [App "P" ts,App "R" ls]) = FFun fun prof lins
where
fun = mkCId f
prof = map toProfile ts
lins = mkArray [fromIntegral seqid | AInt seqid <- ls]
toProfile :: RExp -> Profile
toProfile AMet = []
toProfile (App "_A" [t]) = [expToInt t]
toProfile (App "_U" ts) = [expToInt t | App "_A" [t] <- ts]
toFSeq :: RExp -> FSeq
toFSeq (App "seq" ss) = mkArray [toSymbol s | s <- ss]
toProductionSet :: RExp -> (FCat,Set.Set Production)
toProductionSet (App "td" (rt : xs)) = (expToInt rt, Set.fromList (map toProduction xs))
where
toProduction (App "A" (ruleid : at)) = FApply (expToInt ruleid) (map expToInt at)
toProduction (App "C" [fcat]) = FCoerce (expToInt fcat)
toSymbol :: RExp -> FSymbol
toSymbol (App "P" [n,l]) = FSymCat (expToInt n) (expToInt l)
toSymbol (App "KP" (d:alts)) = FSymTok (toKP d alts)
toSymbol (AStr t) = FSymTok (KS t)
toType :: RExp -> Type
toType e = case e of
App cat [App "H" hypos, App "X" exps] ->
DTyp (map toHypo hypos) (mkCId cat) (map toExp exps)
_ -> error $ "type " ++ show e
toHypo :: RExp -> Hypo
toHypo e = case e of
App x [typ] -> Hyp (mkCId x) (toType typ)
_ -> error $ "hypo " ++ show e
toExp :: RExp -> Expr
toExp e = case e of
App "Abs" [App x [], exp] -> EAbs (mkCId x) (toExp exp)
App "App" [e1,e2] -> EApp (toExp e1) (toExp e2)
App "Eq" eqs -> EEq [Equ (map toExp ps) (toExp v) | App "E" (v:ps) <- eqs]
App "Var" [App i []] -> EVar (mkCId i)
AMet -> EMeta 0
AInt i -> ELit (LInt i)
AFlt i -> ELit (LFlt i)
AStr i -> ELit (LStr i)
_ -> error $ "exp " ++ show e
toTerm :: RExp -> Term
toTerm e = case e of
App "R" es -> R (map toTerm es)
App "S" es -> S (map toTerm es)
App "FV" es -> FV (map toTerm es)
App "P" [e,v] -> P (toTerm e) (toTerm v)
App "W" [AStr s,v] -> W s (toTerm v)
App "A" [AInt i] -> V (fromInteger i)
App f [] -> F (mkCId f)
AInt i -> C (fromInteger i)
AMet -> TM "?"
App "KP" (d:alts) -> K (toKP d alts)
AStr s -> K (KS s)
_ -> error $ "term " ++ show e
toKP d alts = KP (toStr d) (map toAlt alts)
where
toStr (App "S" vs) = [v | AStr v <- vs]
toAlt (App "A" [x,y]) = Alt (toStr x) (toStr y)
------------------------------
--- from internal to parser --
------------------------------
fromPGF :: PGF -> Grammar
fromPGF pgf = Grm [
App "pgf" (AInt pgfMajorVersion:AInt pgfMinorVersion
: App (prCId (absname pgf)) [] : map (flip App [] . prCId) (cncnames pgf)),
App "flags" [App (prCId f) [AStr v] | (f,v) <- Map.toList (gflags pgf `Map.union` aflags apgf)],
App "abstract" [
App "fun" [App (prCId f) [fromType t,fromExp d] | (f,(t,d)) <- Map.toList (funs apgf)],
App "cat" [App (prCId f) (map fromHypo hs) | (f,hs) <- Map.toList (cats apgf)]
],
App "concrete" [App (prCId lang) (fromConcrete c) | (lang,c) <- Map.toList (concretes pgf)]
]
where
apgf = abstract pgf
fromConcrete cnc = [
App "flags" [App (prCId f) [AStr v] | (f,v) <- Map.toList (cflags cnc)],
App "lin" [App (prCId f) [fromTerm v] | (f,v) <- Map.toList (lins cnc)],
App "oper" [App (prCId f) [fromTerm v] | (f,v) <- Map.toList (opers cnc)],
App "lincat" [App (prCId f) [fromTerm v] | (f,v) <- Map.toList (lincats cnc)],
App "lindef" [App (prCId f) [fromTerm v] | (f,v) <- Map.toList (lindefs cnc)],
App "printname" [App (prCId f) [fromTerm v] | (f,v) <- Map.toList (printnames cnc)],
App "param" [App (prCId f) [fromTerm v] | (f,v) <- Map.toList (paramlincats cnc)]
] ++ maybe [] (\p -> [fromPInfo p]) (parser cnc)
fromType :: Type -> RExp
fromType e = case e of
DTyp hypos cat exps ->
App (prCId cat) [
App "H" (map fromHypo hypos),
App "X" (map fromExp exps)]
fromHypo :: Hypo -> RExp
fromHypo e = case e of
Hyp x typ -> App (prCId x) [fromType typ]
fromExp :: Expr -> RExp
fromExp e = case e of
EAbs x exp -> App "Abs" [App (prCId x) [], fromExp exp]
EApp e1 e2 -> App "App" [fromExp e1, fromExp e2]
EVar x -> App "Var" [App (prCId x) []]
ELit (LStr s) -> AStr s
ELit (LFlt d) -> AFlt d
ELit (LInt i) -> AInt (toInteger i)
EMeta _ -> AMet ----
EEq eqs -> App "Eq" [App "E" (map fromExp (v:ps)) | Equ ps v <- eqs]
fromTerm :: Term -> RExp
fromTerm e = case e of
R es -> App "R" (map fromTerm es)
S es -> App "S" (map fromTerm es)
FV es -> App "FV" (map fromTerm es)
P e v -> App "P" [fromTerm e, fromTerm v]
W s v -> App "W" [AStr s, fromTerm v]
C i -> AInt (toInteger i)
TM _ -> AMet
F f -> App (prCId f) []
V i -> App "A" [AInt (toInteger i)]
K t -> fromTokn t
fromTokn :: Tokn -> RExp
fromTokn (KS s) = AStr s
fromTokn (KP d vs) = App "KP" (str d : [App "A" [str v, str x] | Alt v x <- vs])
where
str v = App "S" (map AStr v)
-- ** Parsing info
fromPInfo :: ParserInfo -> RExp
fromPInfo p = App "parser" [
App "functions" [fromFFun fun | fun <- elems (functions p)],
App "sequences" [fromFSeq seq | seq <- elems (sequences p)],
App "productions" [fromProductionSet xs | xs <- IntMap.toList (productions p)],
App "startcats" [App (prCId f) (map intToExp xs) | (f,xs) <- Map.toList (startCats p)]
]
fromFFun :: FFun -> RExp
fromFFun (FFun fun prof lins) = App (prCId fun) [App "P" (map fromProfile prof), App "R" [intToExp seqid | seqid <- elems lins]]
where
fromProfile :: Profile -> RExp
fromProfile [] = AMet
fromProfile [x] = daughter x
fromProfile args = App "_U" (map daughter args)
daughter n = App "_A" [intToExp n]
fromSymbol :: FSymbol -> RExp
fromSymbol (FSymCat n l) = App "P" [intToExp n, intToExp l]
fromSymbol (FSymTok t) = fromTokn t
fromFSeq :: FSeq -> RExp
fromFSeq seq = App "seq" [fromSymbol s | s <- elems seq]
fromProductionSet :: (FCat,Set.Set Production) -> RExp
fromProductionSet (cat,xs) = App "td" (intToExp cat : map fromPassive (Set.toList xs))
where
fromPassive (FApply ruleid args) = App "A" (intToExp ruleid : map intToExp args)
fromPassive (FCoerce fcat) = App "C" [intToExp fcat]
-- ** Utilities
mkTermMap :: [RExp] -> Map.Map CId Term
mkTermMap ts = Map.fromAscList [(mkCId f,toTerm v) | App f [v] <- ts]
mkArray :: IArray a e => [e] -> a Int e
mkArray xs = listArray (0, length xs - 1) xs
expToInt :: Integral a => RExp -> a
expToInt (App "neg" [AInt i]) = fromIntegral (negate i)
expToInt (AInt i) = fromIntegral i
expToStr :: RExp -> String
expToStr (AStr s) = s
intToExp :: Integral a => a -> RExp
intToExp x | x < 0 = App "neg" [AInt (fromIntegral (negate x))]
| otherwise = AInt (fromIntegral x)
|
