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9bd39a855a
ghc-mod/Language/Haskell/GhcMod/FillSig.hs
Daniel Gröber 9bd39a855a CPP around optparse-applicative and hse conflicts
2017-01-16 21:16:32 +01:00

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{-# LANGUAGE CPP, MultiParamTypeClasses, FunctionalDependencies #-}
{-# LANGUAGE FlexibleInstances #-}
module Language.Haskell.GhcMod.FillSig (
sig
, refine
, auto
) where
import Data.Char (isSymbol)
import Data.Function (on)
import Data.Functor
import Data.List (find, nub, sortBy)
import qualified Data.Map as M
import Data.Maybe (catMaybes)
import Text.PrettyPrint (($$), text, nest)
import Prelude
import Exception (ghandle, SomeException(..))
import GHC (GhcMonad, Id, ParsedModule(..), TypecheckedModule(..), DynFlags,
SrcSpan, Type, GenLocated(L))
import qualified GHC as G
import qualified Name as G
import Outputable (PprStyle)
import qualified Type as Ty
import qualified HsBinds as Ty
import qualified Class as Ty
import qualified Var as Ty
import qualified HsPat as Ty
#if MIN_VERSION_haskell_src_exts(1,18,0)
import qualified Language.Haskell.Exts as HE
#else
import qualified Language.Haskell.Exts.Annotated as HE
#endif
import Djinn.GHC
import qualified Language.Haskell.GhcMod.Gap as Gap
import Language.Haskell.GhcMod.Convert
import Language.Haskell.GhcMod.DynFlags
import Language.Haskell.GhcMod.Monad
import Language.Haskell.GhcMod.SrcUtils
import Language.Haskell.GhcMod.Logging (gmLog)
import Language.Haskell.GhcMod.Pretty (showDoc)
import Language.Haskell.GhcMod.Doc
import Language.Haskell.GhcMod.Types
import Language.Haskell.GhcMod.FileMapping (fileModSummaryWithMapping)
#if __GLASGOW_HASKELL__ >= 710
import GHC (unLoc)
#endif
----------------------------------------------------------------
-- INTIAL CODE FROM FUNCTION OR INSTANCE SIGNATURE
----------------------------------------------------------------
-- Possible signatures we can find: function or instance
data SigInfo
= Signature SrcSpan [G.RdrName] (G.HsType G.RdrName)
| InstanceDecl SrcSpan G.Class
| TyFamDecl SrcSpan G.RdrName TyFamType {- True if closed -} [G.RdrName]
-- Signature for fallback operation via haskell-src-exts
data HESigInfo
= HESignature HE.SrcSpan [HE.Name HE.SrcSpanInfo] (HE.Type HE.SrcSpanInfo)
| HEFamSignature
HE.SrcSpan
TyFamType
(HE.Name HE.SrcSpanInfo)
[HE.Name HE.SrcSpanInfo]
data TyFamType = Closed | Open | Data
initialTyFamString :: TyFamType -> (String, String)
initialTyFamString Closed = ("instance", "")
initialTyFamString Open = ("function", "type instance ")
initialTyFamString Data = ("function", "data instance ")
-- | Create a initial body from a signature.
sig :: IOish m
=> FilePath -- ^ A target file.
-> Int -- ^ Line number.
-> Int -- ^ Column number.
-> GhcModT m String
sig file lineNo colNo =
runGmlT' [Left file] deferErrors $ ghandle fallback $ do
oopts <- outputOpts
style <- getStyle
dflag <- G.getSessionDynFlags
modSum <- fileModSummaryWithMapping file
whenFound oopts (getSignature modSum lineNo colNo) $ \s ->
case s of
Signature loc names ty ->
("function", fourInts loc, map (initialBody dflag style ty) names)
InstanceDecl loc cls ->
let body x = initialBody dflag style (G.idType x) x
in ("instance", fourInts loc, body `map` Ty.classMethods cls)
TyFamDecl loc name flavour vars ->
let (rTy, initial) = initialTyFamString flavour
body = initialFamBody dflag style name vars
in (rTy, fourInts loc, [initial ++ body])
where
fallback (SomeException _) = do
oopts <- outputOpts
-- Code cannot be parsed by ghc module
-- Fallback: try to get information via haskell-src-exts
whenFound oopts (getSignatureFromHE file lineNo colNo) $ \x -> case x of
HESignature loc names ty ->
("function", fourIntsHE loc, map (initialBody undefined undefined ty) names)
HEFamSignature loc flavour name vars ->
let (rTy, initial) = initialTyFamString flavour
in (rTy, fourIntsHE loc, [initial ++ initialFamBody undefined undefined name vars])
----------------------------------------------------------------
-- a. Code for getting the information
-- Get signature from ghc parsing and typechecking
getSignature :: GhcMonad m => G.ModSummary -> Int -> Int -> m (Maybe SigInfo)
getSignature modSum lineNo colNo = do
p@ParsedModule{pm_parsed_source = ps} <- G.parseModule modSum
-- Inspect the parse tree to find the signature
case listifyParsedSpans ps (lineNo, colNo) :: [G.LHsDecl G.RdrName] of
#if __GLASGOW_HASKELL__ >= 800
[L loc (G.SigD (Ty.TypeSig names (G.HsIB _ (G.HsWC _ _ (L _ ty)))))] ->
#elif __GLASGOW_HASKELL__ >= 710
[L loc (G.SigD (Ty.TypeSig names (L _ ty) _))] ->
#else
[L loc (G.SigD (Ty.TypeSig names (L _ ty)))] ->
#endif
-- We found a type signature
return $ Just $ Signature loc (map G.unLoc names) ty
[L _ (G.InstD _)] -> do
-- We found an instance declaration
TypecheckedModule{tm_renamed_source = Just tcs
,tm_checked_module_info = minfo} <- G.typecheckModule p
let lst = listifyRenamedSpans tcs (lineNo, colNo)
case Gap.getClass lst of
Just (clsName,loc) -> obtainClassInfo minfo clsName loc
_ -> return Nothing
#if __GLASGOW_HASKELL__ >= 800
[L loc (G.TyClD (G.FamDecl (G.FamilyDecl info (L _ name) (G.HsQTvs _ vars _) _ _)))] -> do
#elif __GLASGOW_HASKELL__ >= 708
[L loc (G.TyClD (G.FamDecl (G.FamilyDecl info (L _ name) (G.HsQTvs _ vars) _)))] -> do
#elif __GLASGOW_HASKELL__ >= 706
[L loc (G.TyClD (G.TyFamily info (L _ name) (G.HsQTvs _ vars) _))] -> do
#else
[L loc (G.TyClD (G.TyFamily info (L _ name) vars _))] -> do
#endif
#if __GLASGOW_HASKELL__ >= 708
let flavour = case info of
G.ClosedTypeFamily _ -> Closed
G.OpenTypeFamily -> Open
G.DataFamily -> Data
#else
let flavour = case info of -- Closed type families where introduced in GHC 7.8
G.TypeFamily -> Open
G.DataFamily -> Data
#endif
#if __GLASGOW_HASKELL__ >= 800
getTyFamVarName x = case x of
L _ (G.UserTyVar (G.L _ n)) -> n
L _ (G.KindedTyVar (G.L _ n) _) -> n
#elif __GLASGOW_HASKELL__ >= 710
getTyFamVarName x = case x of
L _ (G.UserTyVar n) -> n
L _ (G.KindedTyVar (G.L _ n) _) -> n
#elif __GLASGOW_HASKELL__ >= 706
getTyFamVarName x = case x of
L _ (G.UserTyVar n) -> n
L _ (G.KindedTyVar n _) -> n
#else
getTyFamVarName x = case x of -- In GHC 7.4, HsTyVarBndr's have an extra arg
L _ (G.UserTyVar n _) -> n
L _ (G.KindedTyVar n _ _) -> n
#endif
in return $ Just (TyFamDecl loc name flavour $ map getTyFamVarName vars)
_ -> return Nothing
where obtainClassInfo :: GhcMonad m => G.ModuleInfo -> G.Name -> SrcSpan -> m (Maybe SigInfo)
obtainClassInfo minfo clsName loc = do
tyThing <- G.modInfoLookupName minfo clsName
return $ do Ty.ATyCon clsCon <- tyThing -- In Maybe
cls <- G.tyConClass_maybe clsCon
return $ InstanceDecl loc cls
-- Get signature from haskell-src-exts
getSignatureFromHE :: (MonadIO m, GhcMonad m) =>
FilePath -> Int -> Int -> m (Maybe HESigInfo)
getSignatureFromHE file lineNo colNo = do
presult <- liftIO $ HE.parseFile file
return $ case presult of
HE.ParseOk (HE.Module _ _ _ _ mdecls) -> do
decl <- find (typeSigInRangeHE lineNo colNo) mdecls
case decl of
HE.TypeSig (HE.SrcSpanInfo s _) names ty ->
return $ HESignature s names ty
#if MIN_VERSION_haskell_src_exts(1,18,0)
HE.TypeFamDecl (HE.SrcSpanInfo s _) declHead _ _ ->
#else
HE.TypeFamDecl (HE.SrcSpanInfo s _) declHead _ ->
#endif
let (name, tys) = dHeadTyVars declHead in
return $ HEFamSignature s Open name (map cleanTyVarBind tys)
HE.DataFamDecl (HE.SrcSpanInfo s _) _ declHead _ ->
let (name, tys) = dHeadTyVars declHead in
return $ HEFamSignature s Open name (map cleanTyVarBind tys)
_ -> fail ""
_ -> Nothing
where cleanTyVarBind (HE.KindedVar _ n _) = n
cleanTyVarBind (HE.UnkindedVar _ n) = n
#if MIN_VERSION_haskell_src_exts(1,16,0)
dHeadTyVars :: HE.DeclHead l -> (HE.Name l, [HE.TyVarBind l])
dHeadTyVars (HE.DHead _ name) = (name, [])
dHeadTyVars (HE.DHApp _ r ty) = (++[ty]) `fmap` (dHeadTyVars r)
dHeadTyVars (HE.DHInfix _ ty name) = (name, [ty])
dHeadTyVars (HE.DHParen _ r) = dHeadTyVars r
#else
dHeadTyVars :: HE.DeclHead l -> (HE.Name l, [HE.TyVarBind l])
dHeadTyVars (HE.DHead _ n tys) = (n, tys)
#endif
----------------------------------------------------------------
-- b. Code for generating initial code
-- A list of function arguments, and whether they are functions or normal
-- arguments is built from either a function signature or an instance signature
data FnArg = FnArgFunction | FnArgNormal | FnExplicitName String
initialBody :: FnArgsInfo ty name => DynFlags -> PprStyle -> ty -> name -> String
initialBody dflag style ty name =
initialBody' (getFnName dflag style name) (getFnArgs ty)
initialBody' :: String -> [FnArg] -> String
initialBody' fname args =
initialHead fname args ++ " = " ++ n ++ "_body"
where n = if isSymbolName fname then "" else '_':fname
initialFamBody :: FnArgsInfo ty name
=> DynFlags -> PprStyle -> name -> [name] -> String
initialFamBody dflag style name args =
initialHead fnName fnArgs ++ " = ()"
where fnName = getFnName dflag style name
fnArgs = map (FnExplicitName . getFnName dflag style) args
initialHead :: String -> [FnArg] -> String
initialHead fname args =
case initialBodyArgs args infiniteVars infiniteFns of
[] -> fname
arglist -> if isSymbolName fname
then head arglist ++ " " ++ fname ++ " " ++ unwords (tail arglist)
else fname ++ " " ++ unwords arglist
initialBodyArgs :: [FnArg] -> [String] -> [String] -> [String]
initialBodyArgs [] _ _ = []
initialBodyArgs (FnArgFunction:xs) vs (f:fs) = f : initialBodyArgs xs vs fs
initialBodyArgs (FnArgNormal:xs) (v:vs) fs = v : initialBodyArgs xs vs fs
initialBodyArgs (FnExplicitName n:xs) vs fs = n : initialBodyArgs xs vs fs
initialBodyArgs _ _ _ =
error "initialBodyArgs: This should never happen" -- Lists are infinite
initialHead1 :: String -> [FnArg] -> [String] -> String
initialHead1 fname args elts =
case initialBodyArgs1 args elts of
[] -> fname
arglist
| isSymbolName fname ->
head arglist ++ " " ++ fname ++ " " ++ unwords (tail arglist)
| otherwise ->
fname ++ " " ++ unwords arglist
initialBodyArgs1 :: [FnArg] -> [String] -> [String]
initialBodyArgs1 args elts = take (length args) elts
-- Getting the initial body of function and instances differ
-- This is because for functions we only use the parsed file
-- (so the full file doesn't have to be type correct)
-- but for instances we need to get information about the class
class FnArgsInfo ty name | ty -> name, name -> ty where
getFnName :: DynFlags -> PprStyle -> name -> String
getFnArgs :: ty -> [FnArg]
instance FnArgsInfo (G.HsType G.RdrName) (G.RdrName) where
getFnName dflag style name = showOccName dflag style $ Gap.occName name
#if __GLASGOW_HASKELL__ >= 800
getFnArgs (G.HsForAllTy _ (L _ iTy))
#elif __GLASGOW_HASKELL__ >= 710
getFnArgs (G.HsForAllTy _ _ _ _ (L _ iTy))
#else
getFnArgs (G.HsForAllTy _ _ _ (L _ iTy))
#endif
= getFnArgs iTy
getFnArgs (G.HsParTy (L _ iTy)) = getFnArgs iTy
getFnArgs (G.HsFunTy (L _ lTy) (L _ rTy)) =
(if fnarg lTy then FnArgFunction else FnArgNormal):getFnArgs rTy
where fnarg ty = case ty of
#if __GLASGOW_HASKELL__ >= 800
(G.HsForAllTy _ (L _ iTy)) ->
#elif __GLASGOW_HASKELL__ >= 710
(G.HsForAllTy _ _ _ _ (L _ iTy)) ->
#else
(G.HsForAllTy _ _ _ (L _ iTy)) ->
#endif
fnarg iTy
(G.HsParTy (L _ iTy)) -> fnarg iTy
(G.HsFunTy _ _) -> True
_ -> False
getFnArgs _ = []
instance FnArgsInfo (HE.Type HE.SrcSpanInfo) (HE.Name HE.SrcSpanInfo) where
getFnName _ _ (HE.Ident _ s) = s
getFnName _ _ (HE.Symbol _ s) = s
getFnArgs (HE.TyForall _ _ _ iTy) = getFnArgs iTy
getFnArgs (HE.TyParen _ iTy) = getFnArgs iTy
getFnArgs (HE.TyFun _ lTy rTy) =
(if fnarg lTy then FnArgFunction else FnArgNormal):getFnArgs rTy
where fnarg ty = case ty of
(HE.TyForall _ _ _ iTy) -> fnarg iTy
(HE.TyParen _ iTy) -> fnarg iTy
(HE.TyFun _ _ _) -> True
_ -> False
getFnArgs _ = []
instance FnArgsInfo Type Id where
getFnName dflag style method = showOccName dflag style $ G.getOccName method
getFnArgs = getFnArgs' . Ty.dropForAlls
where getFnArgs' ty | Just (lTy,rTy) <- Ty.splitFunTy_maybe ty =
maybe (if Ty.isPredTy lTy then getFnArgs' rTy else FnArgNormal:getFnArgs' rTy)
(\_ -> FnArgFunction:getFnArgs' rTy)
$ Ty.splitFunTy_maybe lTy
getFnArgs' ty | Just (_,iTy) <- Ty.splitForAllTy_maybe ty =
getFnArgs' iTy
getFnArgs' _ = []
-- Infinite supply of variable and function variable names
infiniteVars, infiniteFns :: [String]
infiniteVars = infiniteSupply ["x","y","z","t","u","v","w"]
infiniteFns = infiniteSupply ["f","g","h"]
infiniteSupply :: [String] -> [String]
infiniteSupply initialSupply =
initialSupply ++ concatMap (\n -> map (\v -> v ++ show n) initialSupply)
([1 .. ] :: [Integer])
-- Check whether a String is a symbol name
isSymbolName :: String -> Bool
isSymbolName (c:_) = c `elem` "!#$%&*+./<=>?@\\^|-~" || isSymbol c
isSymbolName [] = error "This should never happen"
----------------------------------------------------------------
-- REWRITE A HOLE / UNDEFINED VIA A FUNCTION
----------------------------------------------------------------
refine :: IOish m
=> FilePath -- ^ A target file.
-> Int -- ^ Line number.
-> Int -- ^ Column number.
-> Expression -- ^ A Haskell expression.
-> GhcModT m String
refine file lineNo colNo (Expression expr) =
ghandle handler $
runGmlT' [Left file] deferErrors $ do
oopts <- outputOpts
style <- getStyle
dflag <- G.getSessionDynFlags
modSum <- fileModSummaryWithMapping file
p <- G.parseModule modSum
tcm@TypecheckedModule{tm_typechecked_source = tcs} <- G.typecheckModule p
ety <- G.exprType expr
whenFound oopts (findVar dflag style tcm tcs lineNo colNo) $
\(loc, name, rty, paren) ->
let eArgs = getFnArgs ety
rArgs = getFnArgs rty
diffArgs' = length eArgs - length rArgs
diffArgs = if diffArgs' < 0 then 0 else diffArgs'
iArgs = take diffArgs eArgs
txt = initialHead1 expr iArgs (infinitePrefixSupply name)
in (fourInts loc, doParen paren txt)
where
handler (SomeException ex) = do
gmLog GmException "refining" $
text "" $$ nest 4 (showDoc ex)
emptyResult =<< outputOpts
-- Look for the variable in the specified position
findVar
:: GhcMonad m
=> DynFlags
-> PprStyle
-> G.TypecheckedModule
-> G.TypecheckedSource
-> Int
-> Int
-> m (Maybe (SrcSpan, String, Type, Bool))
findVar dflag style tcm tcs lineNo colNo =
case lst of
#if __GLASGOW_HASKELL__ >= 800
e@(L _ (G.HsVar (L _ i))):others -> do
#else
e@(L _ (G.HsVar i)):others -> do
#endif
tyInfo <- Gap.getType tcm e
case tyInfo of
Just (s, typ)
| name == "undefined" || head name == '_' ->
return $ Just (s, name, typ, b)
where
name = getFnName dflag style i
-- If inside an App, we need parenthesis
b = case others of
L _ (G.HsApp (L _ a1) (L _ a2)):_ ->
isSearchedVar i a1 || isSearchedVar i a2
_ -> False
_ -> return Nothing
_ -> return Nothing
where
lst :: [G.LHsExpr Id]
lst = sortBy (cmp `on` G.getLoc) $ listifySpans tcs (lineNo, colNo)
infinitePrefixSupply :: String -> [String]
infinitePrefixSupply "undefined" = repeat "undefined"
infinitePrefixSupply p = map (\n -> p ++ "_" ++ show n) ([1 ..] :: [Integer])
doParen :: Bool -> String -> String
doParen False s = s
doParen True s = if ' ' `elem` s then '(':s ++ ")" else s
isSearchedVar :: Id -> G.HsExpr Id -> Bool
#if __GLASGOW_HASKELL__ >= 800
isSearchedVar i (G.HsVar (L _ i2)) = i == i2
#else
isSearchedVar i (G.HsVar i2) = i == i2
#endif
isSearchedVar _ _ = False
----------------------------------------------------------------
-- REFINE AUTOMATICALLY
----------------------------------------------------------------
auto :: IOish m
=> FilePath -- ^ A target file.
-> Int -- ^ Line number.
-> Int -- ^ Column number.
-> GhcModT m String
auto file lineNo colNo =
ghandle handler $ runGmlT' [Left file] deferErrors $ do
oopts <- outputOpts
style <- getStyle
dflag <- G.getSessionDynFlags
modSum <- fileModSummaryWithMapping file
p <- G.parseModule modSum
tcm@TypecheckedModule {
tm_typechecked_source = tcs
, tm_checked_module_info = minfo
} <- G.typecheckModule p
whenFound' oopts (findVar dflag style tcm tcs lineNo colNo) $ \(loc, _name, rty, paren) -> do
topLevel <- getEverythingInTopLevel minfo
let (f,pats) = getPatsForVariable tcs (lineNo,colNo)
-- Remove self function to prevent recursion, and id to trim
-- cases
filterFn (n,_) = let funName = G.getOccString n
recName = G.getOccString (G.getName f)
in funName `notElem` recName:notWantedFuns
-- Find without using other functions in top-level
localBnds = M.unions $
map (\(L _ pat) -> getBindingsForPat pat) pats
lbn = filter filterFn (M.toList localBnds)
djinnsEmpty <- djinn True (Just minfo) lbn rty (Max 10) 100000
let -- Find with the entire top-level
almostEnv = M.toList $ M.union localBnds topLevel
env = filter filterFn almostEnv
djinns <- djinn True (Just minfo) env rty (Max 10) 100000
return ( fourInts loc
, map (doParen paren) $ nub (djinnsEmpty ++ djinns))
where
handler (SomeException ex) = do
gmLog GmException "auto-refining" $
text "" $$ nest 4 (showDoc ex)
emptyResult =<< outputOpts
-- Functions we do not want in completions
notWantedFuns :: [String]
notWantedFuns = ["id", "asTypeOf", "const"]
-- Get all things defined in top-level
getEverythingInTopLevel :: GhcMonad m => G.ModuleInfo -> m (M.Map G.Name Type)
getEverythingInTopLevel m = do
let modInfo = tyThingsToInfo (G.modInfoTyThings m)
topNames = G.modInfoTopLevelScope m
case topNames of
Just topNames' -> do topThings <- mapM G.lookupGlobalName topNames'
let topThings' = catMaybes topThings
topInfo = tyThingsToInfo topThings'
return $ M.union modInfo topInfo
Nothing -> return modInfo
tyThingsToInfo :: [Ty.TyThing] -> M.Map G.Name Type
tyThingsToInfo [] = M.empty
tyThingsToInfo (G.AnId i : xs) =
M.insert (G.getName i) (Ty.varType i) (tyThingsToInfo xs)
-- Getting information about constructors is not needed
-- because they will be added by djinn-ghc when traversing types
-- #if __GLASGOW_HASKELL__ >= 708
-- tyThingToInfo (G.AConLike (G.RealDataCon con)) = return [(Ty.dataConName con, Ty.dataConUserType con)]
-- #else
-- tyThingToInfo (G.AConLike con) = return [(Ty.dataConName con, Ty.dataConUserType con)]
-- #endif
tyThingsToInfo (_:xs) = tyThingsToInfo xs
-- Find the Id of the function and the pattern where the hole is located
getPatsForVariable :: G.TypecheckedSource -> (Int,Int) -> (Id, [Ty.LPat Id])
getPatsForVariable tcs (lineNo, colNo) =
let (L _ bnd:_) = sortBy (cmp `on` G.getLoc) $
listifySpans tcs (lineNo, colNo) :: [G.LHsBind Id]
in case bnd of
G.PatBind { Ty.pat_lhs = L ploc pat } -> case pat of
Ty.ConPatIn (L _ i) _ -> (i, [L ploc pat])
_ -> (error "This should never happen", [])
G.FunBind { Ty.fun_id = L _ funId } ->
let m = sortBy (cmp `on` G.getLoc) $ listifySpans tcs (lineNo, colNo)
#if __GLASGOW_HASKELL__ >= 708
:: [G.LMatch Id (G.LHsExpr Id)]
#else
:: [G.LMatch Id]
#endif
#if __GLASGOW_HASKELL__ >= 710
(L _ (G.Match _ pats _ _):_) = m
#else
(L _ (G.Match pats _ _):_) = m
#endif
in (funId, pats)
_ -> (error "This should never happen", [])
getBindingsForPat :: Ty.Pat Id -> M.Map G.Name Type
#if __GLASGOW_HASKELL__ >= 800
getBindingsForPat (Ty.VarPat (L _ i)) = M.singleton (G.getName i) (Ty.varType i)
#else
getBindingsForPat (Ty.VarPat i) = M.singleton (G.getName i) (Ty.varType i)
#endif
getBindingsForPat (Ty.LazyPat (L _ l)) = getBindingsForPat l
getBindingsForPat (Ty.BangPat (L _ b)) = getBindingsForPat b
getBindingsForPat (Ty.AsPat (L _ a) (L _ i)) =
M.insert (G.getName a) (Ty.varType a) (getBindingsForPat i)
#if __GLASGOW_HASKELL__ >= 708
getBindingsForPat (Ty.ListPat l _ _) =
M.unions $ map (\(L _ i) -> getBindingsForPat i) l
#else
getBindingsForPat (Ty.ListPat l _) =
M.unions $ map (\(L _ i) -> getBindingsForPat i) l
#endif
getBindingsForPat (Ty.TuplePat l _ _) =
M.unions $ map (\(L _ i) -> getBindingsForPat i) l
getBindingsForPat (Ty.PArrPat l _) =
M.unions $ map (\(L _ i) -> getBindingsForPat i) l
getBindingsForPat (Ty.ViewPat _ (L _ i) _) = getBindingsForPat i
getBindingsForPat (Ty.SigPatIn (L _ i) _) = getBindingsForPat i
getBindingsForPat (Ty.SigPatOut (L _ i) _) = getBindingsForPat i
getBindingsForPat (Ty.ConPatIn (L _ i) d) =
M.insert (G.getName i) (Ty.varType i) (getBindingsForRecPat d)
getBindingsForPat (Ty.ConPatOut { Ty.pat_args = d }) = getBindingsForRecPat d
getBindingsForPat _ = M.empty
getBindingsForRecPat :: Ty.HsConPatDetails Id -> M.Map G.Name Type
#if __GLASGOW_HASKELL__ >= 800
getBindingsForRecPat (G.PrefixCon args) =
#else
getBindingsForRecPat (Ty.PrefixCon args) =
#endif
M.unions $ map (\(L _ i) -> getBindingsForPat i) args
#if __GLASGOW_HASKELL__ >= 800
getBindingsForRecPat (G.InfixCon (L _ a1) (L _ a2)) =
#else
getBindingsForRecPat (Ty.InfixCon (L _ a1) (L _ a2)) =
#endif
M.union (getBindingsForPat a1) (getBindingsForPat a2)
#if __GLASGOW_HASKELL__ >= 800
getBindingsForRecPat (G.RecCon (Ty.HsRecFields { Ty.rec_flds = fields })) =
#else
getBindingsForRecPat (Ty.RecCon (Ty.HsRecFields { Ty.rec_flds = fields })) =
#endif
getBindingsForRecFields (map unLoc' fields)
where
#if __GLASGOW_HASKELL__ >= 710
unLoc' = unLoc
#else
unLoc' = id
#endif
getBindingsForRecFields [] = M.empty
getBindingsForRecFields (Ty.HsRecField {Ty.hsRecFieldArg = (L _ a)}:fs) =
M.union (getBindingsForPat a) (getBindingsForRecFields fs)
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