module Language.Haskell.Liquid.Bare.Spec (
makeClasses
, makeQualifiers
, makeHints
, makeLVar
, makeLazy
, makeHIMeas
, makeTExpr
, makeTargetVars
, makeAssertSpec
, makeAssumeSpec
, makeDefaultMethods
, makeIAliases
, makeInvariants
, makeSpecDictionaries
) where
import TyCon
import Var
import Control.Applicative ((<$>))
import Control.Monad.State
import Data.Maybe
import Data.Monoid
import qualified Data.List as L
import qualified Data.HashSet as S
import qualified Data.HashMap.Strict as M
import Language.Fixpoint.Misc (concatMapM, group, mapFst, snd3)
import Language.Fixpoint.Names (dropModuleNames, dropSym, isPrefixOfSym, qualifySymbol, symbolString, takeModuleNames)
import Language.Fixpoint.Types (Qualifier(..), symbol)
import Language.Haskell.Liquid.Dictionaries
import Language.Haskell.Liquid.GhcMisc (getSourcePos, showPpr, symbolTyVar)
import Language.Haskell.Liquid.Misc (addFst3, fourth4)
import Language.Haskell.Liquid.RefType (generalize, rVar, symbolRTyVar)
import Language.Haskell.Liquid.Types
import qualified Language.Haskell.Liquid.Measure as Ms
import Language.Haskell.Liquid.Bare.Check (checkDefAsserts)
import Language.Haskell.Liquid.Bare.Env
import Language.Haskell.Liquid.Bare.Existential
import Language.Haskell.Liquid.Bare.Lookup
import Language.Haskell.Liquid.Bare.Misc (joinVar)
import Language.Haskell.Liquid.Bare.OfType
import Language.Haskell.Liquid.Bare.Resolve
import Language.Haskell.Liquid.Bare.SymSort
makeClasses cfg vs (mod, spec) = inModule mod $ mapM mkClass $ Ms.classes spec
where
unClass = snd . bkClass . fourth4 . bkUniv
mkClass (RClass c ss as ms)
= do let l = loc c
tc <- lookupGhcTyCon c
ss' <- mapM (mkSpecType l) ss
let (dc:_) = tyConDataCons tc
let αs = map symbolRTyVar as
let as' = [rVar $ symbolTyVar a | a <- as ]
let ms' = [ (s, rFun "" (RApp c (flip RVar mempty <$> as) [] mempty) t) | (s, t) <- ms]
vts <- makeSpec cfg vs ms'
let sts = [(val s, unClass $ val t) | (s, _) <- ms
| (_, _, t) <- vts]
let t = rCls tc as'
let dcp = DataConP l αs [] [] ss' (reverse sts) t
return ((dc,dcp),vts)
makeQualifiers (mod,spec) = inModule mod mkQuals
where
mkQuals = mapM (\q -> resolve (q_pos q) q) $ Ms.qualifiers spec
makeHints vs spec = varSymbols id vs $ Ms.decr spec
makeLVar vs spec = fmap fst <$> (varSymbols id vs $ [(v, ()) | v <- Ms.lvars spec])
makeLazy vs spec = fmap fst <$> (varSymbols id vs $ [(v, ()) | v <- S.toList $ Ms.lazy spec])
makeHIMeas vs spec = fmap (uncurry $ flip Loc) <$> (varSymbols id vs $ [(v, loc v) | v <- (S.toList $ Ms.hmeas spec) ++ (S.toList $ Ms.inlines spec)])
makeTExpr vs spec = varSymbols id vs $ Ms.termexprs spec
varSymbols :: ([Var] -> [Var]) -> [Var] -> [(LocSymbol, a)] -> BareM [(Var, a)]
varSymbols f vs = concatMapM go
where lvs = M.map L.sort $ group [(sym v, locVar v) | v <- vs]
sym = dropModuleNames . symbol . showPpr
locVar v = (getSourcePos v, v)
go (s, ns) = case M.lookup (val s) lvs of
Just lvs -> return ((, ns) <$> varsAfter f s lvs)
Nothing -> ((:[]).(,ns)) <$> lookupGhcVar s
varsAfter f s lvs
| eqList (fst <$> lvs) = f (snd <$> lvs)
| otherwise = map snd $ takeEqLoc $ dropLeLoc lvs
where
takeEqLoc xs@((l, _):_) = L.takeWhile ((l==) . fst) xs
takeEqLoc [] = []
dropLeLoc = L.dropWhile ((loc s >) . fst)
eqList [] = True
eqList (x:xs) = all (==x) xs
makeTargetVars :: ModName -> [Var] -> [String] -> BareM [Var]
makeTargetVars name vs ss
= do env <- gets hscEnv
ns <- liftIO $ concatMapM (lookupName env name . dummyLoc . prefix) ss
return $ filter ((`elem` ns) . varName) vs
where
prefix s = qualifySymbol (symbol name) (symbol s)
makeAssertSpec cmod cfg vs lvs (mod,spec)
| cmod == mod
= makeLocalSpec cfg cmod vs lvs (grepClassAsserts (Ms.rinstance spec)) (Ms.sigs spec ++ Ms.localSigs spec)
| otherwise
= inModule mod $ makeSpec cfg vs $ Ms.sigs spec
makeAssumeSpec cmod cfg vs lvs (mod,spec)
| cmod == mod
= makeLocalSpec cfg cmod vs lvs [] $ Ms.asmSigs spec
| otherwise
= inModule mod $ makeSpec cfg vs $ Ms.asmSigs spec
grepClassAsserts = concatMap go
where
go = map goOne . risigs
goOne = mapFst (fmap (symbol . (".$c" ++ ) . symbolString))
makeDefaultMethods :: [Var] -> [(ModName,Var,Located SpecType)]
-> [(ModName,Var,Located SpecType)]
makeDefaultMethods defVs sigs
= [ (m,dmv,t)
| dmv <- defVs
, let dm = symbol $ showPpr dmv
, "$dm" `isPrefixOfSym` (dropModuleNames dm)
, let mod = takeModuleNames dm
, let method = qualifySymbol mod $ dropSym 3 (dropModuleNames dm)
, let mb = L.find ((method `isPrefixOfSym`) . symbol . snd3) sigs
, isJust mb
, let Just (m,_,t) = mb
]
makeLocalSpec :: Config -> ModName -> [Var] -> [Var] -> [(LocSymbol, BareType)] -> [(LocSymbol, BareType)]
-> BareM [(ModName, Var, Located SpecType)]
makeLocalSpec cfg mod vs lvs cbs xbs
= do env <- get
vbs1 <- fmap expand3 <$> varSymbols fchoose lvs (dupSnd <$> xbs1)
unless (noCheckUnknown cfg) $ checkDefAsserts env vbs1 xbs1
vts1 <- map (addFst3 mod) <$> mapM mkVarSpec vbs1
vts2 <- makeSpec cfg vs xbs2
return $ vts1 ++ vts2
where
xbs1 = xbs1' ++ cbs
(xbs1', xbs2) = L.partition (modElem mod . fst) xbs
dupSnd (x, y) = (dropMod x, (x, y))
expand3 (x, (y, w)) = (x, y, w)
dropMod = fmap (dropModuleNames . symbol)
fchoose ls = maybe ls (:[]) $ L.find (`elem` vs) ls
modElem n x = (takeModuleNames $ val x) == (symbol n)
makeSpec :: Config -> [Var] -> [(LocSymbol, BareType)]
-> BareM [(ModName, Var, Located SpecType)]
makeSpec cfg vs xbs
= do vbs <- map (joinVar vs) <$> lookupIds xbs
env@(BE { modName = mod}) <- get
unless (noCheckUnknown cfg) $ checkDefAsserts env vbs xbs
map (addFst3 mod) <$> mapM mkVarSpec vbs
lookupIds = mapM lookup
where
lookup (s, t) = (,s,t) <$> lookupGhcVar s
mkVarSpec :: (Var, LocSymbol, BareType) -> BareM (Var, Located SpecType)
mkVarSpec (v, Loc l _, b) = tx <$> mkSpecType l b
where
tx = (v,) . Loc l . generalize
makeIAliases (mod, spec)
= inModule mod $ makeIAliases' $ Ms.ialiases spec
makeIAliases' :: [(Located BareType, Located BareType)] -> BareM [(Located SpecType, Located SpecType)]
makeIAliases' ts = mapM mkIA ts
where
mkIA (t1, t2) = liftM2 (,) (mkI t1) (mkI t2)
mkI (Loc l t) = (Loc l) . generalize <$> mkSpecType l t
makeInvariants (mod,spec)
= inModule mod $ makeInvariants' $ Ms.invariants spec
makeInvariants' :: [Located BareType] -> BareM [Located SpecType]
makeInvariants' ts = mapM mkI ts
where
mkI (Loc l t) = (Loc l) . generalize <$> mkSpecType l t
makeSpecDictionaries embs vars specs sp
= do ds <- (dfromList . concat) <$> mapM (makeSpecDictionary embs vars) specs
return $ sp {dicts = ds}
makeSpecDictionary embs vars (_, spec)
= mapM (makeSpecDictionaryOne embs vars) (Ms.rinstance spec)
makeSpecDictionaryOne embs vars (RI x t xts)
= do t' <- mkTy t
tyi <- gets tcEnv
ts' <- (map (txRefSort tyi embs . txExpToBind)) <$> mapM mkTy' ts
let (d, dts) = makeDictionary $ RI x t' $ zip xs ts'
let v = lookupName d
return (v, dts)
where
mkTy t = mkSpecType (loc x) t
mkTy' t = generalize <$> mkTy t
(xs, ts) = unzip xts
lookupName x
= case filter ((==x) . fst) ((\x -> (dropModuleNames $ symbol $ show x, x)) <$> vars) of
[(_, x)] -> x
_ -> head vars