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{-# LANGUAGE TupleSections, FlexibleInstances, TypeSynonymInstances #-}
{-# LANGUAGE Rank2Types #-}
module Info (infoExpr, typeExpr) where
import Control.Applicative
import Control.Monad (void)
import CoreUtils
import Data.Function
import Data.Generics
import Data.List
import Data.Maybe
import Data.Ord as O
import Data.Time.Clock
import Desugar
import Doc
import GHC
import GHC.SYB.Utils
import GHCApi
import GHCChoice
import qualified Gap
import HscTypes
import NameSet
import Outputable
import PprTyThing
import TcHsSyn (hsPatType)
import TcRnTypes
import Types
----------------------------------------------------------------
type Expression = String
type ModuleString = String
----------------------------------------------------------------
infoExpr :: Options -> Cradle -> ModuleString -> Expression -> FilePath -> IO String
infoExpr opt cradle modstr expr file = (++ "\n") <$> info opt cradle file modstr expr
info :: Options -> Cradle -> FilePath -> ModuleString -> FilePath -> IO String
info opt cradle fileName modstr expr =
inModuleContext opt cradle fileName modstr exprToInfo "Cannot show info"
where
exprToInfo = infoThing expr
----------------------------------------------------------------
class HasType a where
getType :: GhcMonad m => TypecheckedModule -> a -> m (Maybe (SrcSpan, Type))
instance HasType (LHsExpr Id) where
getType tcm e = do
hs_env <- getSession
(_, mbe) <- Gap.liftIO $ deSugarExpr hs_env modu rn_env ty_env e
return $ (getLoc e, ) <$> CoreUtils.exprType <$> mbe
where
modu = ms_mod $ pm_mod_summary $ tm_parsed_module tcm
rn_env = tcg_rdr_env $ fst $ tm_internals_ tcm
ty_env = tcg_type_env $ fst $ tm_internals_ tcm
instance HasType (LHsBind Id) where
getType _ (L spn FunBind{fun_matches = MatchGroup _ typ}) = return $ Just (spn, typ)
getType _ _ = return Nothing
instance HasType (LPat Id) where
getType _ (L spn pat) = return $ Just (spn, hsPatType pat)
typeExpr :: Options -> Cradle -> ModuleString -> Int -> Int -> FilePath -> IO String
typeExpr opt cradle modstr lineNo colNo file = Info.typeOf opt cradle file modstr lineNo colNo
typeOf :: Options -> Cradle -> FilePath -> ModuleString -> Int -> Int -> IO String
typeOf opt cradle fileName modstr lineNo colNo =
inModuleContext opt cradle fileName modstr exprToType errmsg
where
exprToType = do
modSum <- getModSummary $ mkModuleName modstr
p <- parseModule modSum
tcm@TypecheckedModule{tm_typechecked_source = tcs} <- typecheckModule p
let bs = listifySpans tcs (lineNo, colNo) :: [LHsBind Id]
es = listifySpans tcs (lineNo, colNo) :: [LHsExpr Id]
ps = listifySpans tcs (lineNo, colNo) :: [LPat Id]
bts <- mapM (getType tcm) bs
ets <- mapM (getType tcm) es
pts <- mapM (getType tcm) ps
dflag <- getSessionDynFlags
let sss = map (toTup dflag) $ sortBy (cmp `on` fst) $ catMaybes $ concat [ets, bts, pts]
return $ convert opt sss
toTup :: DynFlags -> (SrcSpan, Type) -> ((Int,Int,Int,Int),String)
toTup dflag (spn, typ) = (fourInts spn, pretty dflag typ)
fourInts :: SrcSpan -> (Int,Int,Int,Int)
fourInts = fromMaybe (0,0,0,0) . Gap.getSrcSpan
cmp a b
| a `isSubspanOf` b = O.LT
| b `isSubspanOf` a = O.GT
| otherwise = O.EQ
errmsg = convert opt ([] :: [((Int,Int,Int,Int),String)])
listifySpans :: Typeable a => TypecheckedSource -> (Int, Int) -> [Located a]
listifySpans tcs lc = listifyStaged TypeChecker p tcs
where
p (L spn _) = isGoodSrcSpan spn && spn `spans` lc
listifyStaged :: Typeable r => Stage -> (r -> Bool) -> GenericQ [r]
listifyStaged s p = everythingStaged s (++) [] ([] `mkQ` (\x -> [x | p x]))
pretty :: DynFlags -> Type -> String
pretty dflag = showUnqualifiedOneLine dflag . pprTypeForUser False
----------------------------------------------------------------
-- from ghc/InteractiveUI.hs
infoThing :: String -> Ghc String
infoThing str = do
names <- parseName str
mb_stuffs <- mapM getInfo names
let filtered = filterOutChildren (\(t,_f,_i) -> t) (catMaybes mb_stuffs)
dflag <- getSessionDynFlags
return $ showUnqualifiedPage dflag $ vcat (intersperse (text "") $ map (pprInfo False) filtered)
filterOutChildren :: (a -> TyThing) -> [a] -> [a]
filterOutChildren get_thing xs
= [x | x <- xs, not (getName (get_thing x) `elemNameSet` implicits)]
where
implicits = mkNameSet [getName t | x <- xs, t <- implicitTyThings (get_thing x)]
pprInfo :: PrintExplicitForalls -> (TyThing, GHC.Fixity, [Gap.ClsInst]) -> SDoc
pprInfo pefas (thing, fixity, insts)
= pprTyThingInContextLoc pefas thing
$$ show_fixity fixity
$$ vcat (map pprInstance insts)
where
show_fixity fx
| fx == defaultFixity = Outputable.empty
| otherwise = ppr fx <+> ppr (getName thing)
----------------------------------------------------------------
inModuleContext :: Options -> Cradle -> FilePath -> ModuleString -> Ghc String -> String -> IO String
inModuleContext opt cradle fileName modstr action errmsg =
withGHCDummyFile (valid ||> invalid ||> return errmsg)
where
valid = do
void $ initializeFlagsWithCradle opt cradle ["-w"] False
setTargetFile fileName
checkSlowAndSet
void $ load LoadAllTargets
doif setContextFromTarget action
invalid = do
void $ initializeFlagsWithCradle opt cradle ["-w"] False
setTargetBuffer
checkSlowAndSet
void $ load LoadAllTargets
doif setContextFromTarget action
setTargetBuffer = do
modgraph <- depanal [mkModuleName modstr] True
dflag <- getSessionDynFlags
let imports = concatMap (map (showQualifiedPage dflag . ppr . unLoc)) $
map ms_imps modgraph ++ map ms_srcimps modgraph
moddef = "module " ++ sanitize modstr ++ " where"
header = moddef : imports
importsBuf <- Gap.toStringBuffer header
clkTime <- Gap.liftIO getCurrentTime
setTargets [Gap.mkTarget (TargetModule $ mkModuleName modstr)
True
(Just (importsBuf, clkTime))]
doif m t = m >>= \ok -> if ok then t else goNext
sanitize = fromMaybe "SomeModule" . listToMaybe . words
setContextFromTarget :: Ghc Bool
setContextFromTarget = depanal [] False >>= Gap.setCtx
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