module Language.Grammars.SyntaxMacros where
import Language.AbstractSyntax.TTTAS
import Control.Arrow
import qualified UU.Parsing as UU
import Language.Grammars.SyntaxMacros.Scanner
import Language.Grammars.Grammar
import Language.Grammars.Transformations.RemoveFix
import Language.Grammars.Transformations.RemoveEmpties
import Language.Grammars.Transformations.LeftCorner
type GramTrafo = Trafo Unit (Productions TL)
type ExtGram env start nts
= GramTrafo env () (Export start nts env)
type SyntaxMacro env start nts start' nts'
= GramTrafo env (Export start nts env) (Export start' nts' env)
data Export start nts env = Export (Symbol start TNonT env) (nts env)
addNT :: GramTrafo env (ListProd TL env a) (Symbol a TNonT env)
addNT = proc p -> do
r <- newSRef -< prod p
returnA -< Nont r
addProds :: GramTrafo env
(Symbol a TNonT env, ListProd TL env a) ()
addProds = proc (nont, prds) -> do
updateFinalEnv -<
updateEnv (\ps -> PS $ (unPP prds) ++ (unPS ps)) (getRefNT nont)
closeGram :: (forall env. ExtGram env a nts)
-> Grammar a
closeGram prds = case runTrafo prds Unit () of
Result _ (Export (Nont r) _) gram
-> (leftCorner . removeEmpties . removeFix) $ Grammar r gram
extendGram :: (NTRecord (nts env), NTRecord (nts' env))
=> ExtGram env start nts
-> SyntaxMacro env start nts start' nts'
-> ExtGram env start' nts'
extendGram g sm = g >>> sm
(<++>) :: (NTRecord (nts env), NTRecord (nts' env))
=> ExtGram env start nts
-> SyntaxMacro env start nts start' nts'
-> ExtGram env start' nts'
(<++>) = extendGram
exportNTs :: NTRecord (nts env) => GramTrafo env (Export start nts env) (Export start nts env)
exportNTs = returnA
data NTCons nt v l env = NTCons (LSPair nt v TNonT env) (l env)
data NTNil env = NTNil
class NTRecord r
instance NTRecord (NTNil env)
instance (NTRecord (l env), NotDuplicated nt (l env)) => NTRecord (NTCons nt v l env)
class Fail err
data Duplicated nt
class NotDuplicated nt r
instance NotDuplicated nt (NTNil env)
instance Fail (Duplicated nt) => NotDuplicated nt (NTCons nt v l env)
instance NotDuplicated nt1 (l env) => NotDuplicated nt1 (NTCons nt2 v l env)
ntNil :: NTNil env
ntNil = NTNil
infixr 4 ^|
(^|) :: NTRecord (NTCons nt a l env) => LSPair nt a TNonT env -> l env -> NTCons nt a l env
(^|) = NTCons
class GetNT nt r v | nt r -> v where
getNT :: nt -> r -> v
data NotFound nt
instance Fail (NotFound nt) => GetNT nt (NTNil env) r where
getNT = undefined
instance GetNT nt (NTCons nt v l env) (Symbol v TNonT env) where
getNT _ (NTCons f _) = symLSPair f
instance GetNT nt1 (l env) r => GetNT nt1 (NTCons nt2 v l env) r where
getNT nont (NTCons _ l) = getNT nont l
instance GetNT nt (nts env) r => GetNT nt (Export start nts env) r where
getNT nont (Export _ nts) = getNT nont nts
getStart :: Export start nts env -> (Symbol start TNonT env)
getStart (Export start _) = start
exportList :: Symbol start TNonT env -> (NTNil env -> nts env) -> Export start nts env
exportList r l = Export r $ l ntNil
export :: (NTRecord (l env), NotDuplicated nt (l env))
=> nt -> Symbol a TNonT env
-> l env -> NTCons nt a l env
export l nont = (^|) (l ^= nont)
pInt :: UU.Parser Token Int
pChr :: UU.Parser Token Char
pCon :: UU.Parser Token String
pVar :: UU.Parser Token String
pOp :: UU.Parser Token String
pChr = head UU.<$> pChar
pInt = read UU.<$> pInteger
pCon = id UU.<$> pConid
pVar = id UU.<$> pVarid
pOp = id UU.<$> pVarsym
pTerm :: (UU.IsParser p Token)
=> String -> p DTerm
pTerm t = pKey t
newtype Const f a s = C {unC :: f a}
compile :: Grammar a -> UU.Parser Token a
compile (Grammar (start :: Ref a env) rules)
= unC (lookupEnv start result)
where result =
mapEnv
(\ (PS ps) -> C (foldr1 (UU.<|>) [ comp p | p <- ps]))
rules
comp :: forall t . Prod TL t env -> UU.Parser Token t
comp (Star x y) = comp x UU.<*> comp y
comp (FlipStar x y) = comp x UU.<**> comp y
comp (Pure x) = UU.pLow x
comp (Sym (Term t)) = pTerm t
comp (Sym (Nont n)) = unC (lookupEnv n result)
comp (Sym TermInt) = pInt
comp (Sym TermChar) = pChr
comp (Sym TermVarid) = pVar
comp (Sym TermConid) = pCon
comp (Sym TermOp) = pOp
comp (Fix _) = error "This shouldn't be happening!"
mapEnv :: (forall a . f a s -> g a s)
-> Env f s env -> Env g s env
mapEnv _ Empty = Empty
mapEnv f (Ext r v) = Ext (mapEnv f r) (f v)
type ParseMsg = UU.Message Token (Maybe Token)
data ParseResult a = Ok a
| Rep a [ParseMsg]
deriving Show
parse :: UU.Parser Token a -> [Token] -> ParseResult a
parse p input = case rparse p input of
(a,[] ) -> Ok a
(a,msgs) -> Rep a msgs
rparse :: UU.Parser Token a -> [Token] -> (a, [ParseMsg])
rparse p input = let (UU.Pair a _,msgs) = eval (UU.parse p input)
in (a,msgs)
where eval :: UU.Steps a Token (Maybe Token) -> (a, [ParseMsg])
eval (UU.OkVal v r) = let (a,msgs) = v `seq` eval r
in (v a,msgs)
eval (UU.Ok r) = eval r
eval (UU.Cost _ r) = eval r
eval (UU.StRepair _ msg r) = let (v,msgs) = eval r
in (v,msg:msgs)
eval (UU.Best _ r _) = eval r
eval (UU.NoMoreSteps v ) = (v,[])