ghc-mod/Language/Haskell/GhcMod/FillSig.hs

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{-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies, FlexibleInstances, CPP #-}
module Language.Haskell.GhcMod.FillSig (
sig
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, refine
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, auto
) where
import Data.Char (isSymbol)
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import Data.Function (on)
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import Data.List (find, nub, sortBy)
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import qualified Data.Map as M
import Data.Maybe (isJust, catMaybes)
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 qualified Language.Haskell.GhcMod.Gap as Gap
import Language.Haskell.GhcMod.Convert
import Language.Haskell.GhcMod.Monad
import Language.Haskell.GhcMod.SrcUtils
import Language.Haskell.GhcMod.Types
import CoreMonad (liftIO)
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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
import qualified Language.Haskell.Exts.Annotated as HE
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import Djinn.GHC
----------------------------------------------------------------
-- 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 = ghandle handler body
where
body = inModuleContext file $ \dflag style -> do
opt <- options
modSum <- Gap.fileModSummary file
whenFound opt (getSignature modSum lineNo colNo) $ \s -> case s of
Signature loc names ty ->
("function", fourInts loc, map (initialBody dflag style ty) names)
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InstanceDecl loc cls ->
("instance", fourInts loc, map (\x -> initialBody dflag style (G.idType x) x)
(Ty.classMethods cls))
TyFamDecl loc name flavour vars ->
let (rTy, initial) = initialTyFamString flavour
in (rTy, fourInts loc, [initial ++ initialFamBody dflag style name vars])
handler (SomeException _) = do
opt <- options
-- Code cannot be parsed by ghc module
-- Fallback: try to get information via haskell-src-exts
whenFound opt (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
[L loc (G.SigD (Ty.TypeSig names (L _ ty)))] ->
-- 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
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Just (clsName,loc) -> obtainClassInfo minfo clsName loc
_ -> return Nothing
#if __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
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#if __GLASGOW_HASKELL__ >= 706
getTyFamVarName = \x -> case x of
L _ (G.UserTyVar n) -> n
L _ (G.KindedTyVar n _) -> n
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#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 :: 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
HE.TypeFamDecl (HE.SrcSpanInfo s _) (HE.DHead _ name tys) _ ->
return $ HEFamSignature s Open name (map cleanTyVarBind tys)
HE.DataFamDecl (HE.SrcSpanInfo s _) _ (HE.DHead _ name tys) _ ->
return $ HEFamSignature s Open name (map cleanTyVarBind tys)
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_ -> fail ""
_ -> Nothing
where cleanTyVarBind (HE.KindedVar _ n _) = n
cleanTyVarBind (HE.UnkindedVar _ n) = n
----------------------------------------------------------------
-- 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
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initialBody' fname args = initialHead fname args ++ " = "
++ (if isSymbolName fname then "" else '_':fname) ++ "_body"
initialFamBody :: FnArgsInfo ty name => DynFlags -> PprStyle -> name -> [name] -> String
initialFamBody dflag style name args = initialHead (getFnName dflag style name)
(map (\arg -> FnExplicitName (getFnName dflag style arg)) args)
++ " = ()"
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initialHead :: String -> [FnArg] -> String
initialHead fname args =
case initialBodyArgs args infiniteVars infiniteFns of
[] -> fname
arglist -> if isSymbolName fname
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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 "This should never happen" -- Lists are infinite
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initialHead1 :: String -> [FnArg] -> [String] -> String
initialHead1 fname args elts =
case initialBodyArgs1 args elts of
[] -> fname
arglist -> if isSymbolName fname
then head arglist ++ " " ++ fname ++ " " ++ unwords (tail arglist)
else 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
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getFnName dflag style name = showOccName dflag style $ Gap.occName name
getFnArgs (G.HsForAllTy _ _ _ (L _ iTy)) = 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
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where fnarg ty = case ty of
(G.HsForAllTy _ _ _ (L _ iTy)) -> 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
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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"
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----------------------------------------------------------------
-- REWRITE A HOLE / UNDEFINED VIA A FUNCTION
----------------------------------------------------------------
refine :: IOish m
=> FilePath -- ^ A target file.
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-> Int -- ^ Line number.
-> Int -- ^ Column number.
-> Expression -- ^ A Haskell expression.
-> GhcModT m String
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refine file lineNo colNo expr = ghandle handler body
where
body = inModuleContext file $ \dflag style -> do
opt <- options
modSum <- Gap.fileModSummary file
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p <- G.parseModule modSum
tcm@TypecheckedModule{tm_typechecked_source = tcs} <- G.typecheckModule p
ety <- G.exprType expr
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whenFound opt (findVar dflag style tcm tcs lineNo colNo) $ \(loc, name, rty, paren) ->
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let eArgs = getFnArgs ety
rArgs = getFnArgs rty
diffArgs' = length eArgs - length rArgs
diffArgs = if diffArgs' < 0 then 0 else diffArgs'
iArgs = take diffArgs eArgs
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text = initialHead1 expr iArgs (infinitePrefixSupply name)
in (fourInts loc, doParen paren text)
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handler (SomeException _) = emptyResult =<< options
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-- Look for the variable in the specified position
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findVar :: GhcMonad m => DynFlags -> PprStyle
-> G.TypecheckedModule -> G.TypecheckedSource
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-> Int -> Int -> m (Maybe (SrcSpan, String, Type, Bool))
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findVar dflag style tcm tcs lineNo colNo =
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let lst = sortBy (cmp `on` G.getLoc) $ listifySpans tcs (lineNo, colNo) :: [G.LHsExpr Id]
in case lst of
e@(L _ (G.HsVar i)):others ->
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do tyInfo <- Gap.getType tcm e
let name = getFnName dflag style i
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if (name == "undefined" || head name == '_') && isJust tyInfo
then let Just (s,t) = tyInfo
b = case others of -- If inside an App, we need parenthesis
[] -> False
(L _ (G.HsApp (L _ a1) (L _ a2))):_ ->
isSearchedVar i a1 || isSearchedVar i a2
_ -> False
in return $ Just (s, name, t, b)
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else return Nothing
_ -> return Nothing
infinitePrefixSupply :: String -> [String]
infinitePrefixSupply "undefined" = repeat "undefined"
infinitePrefixSupply p = map (\n -> p ++ "_" ++ show n) ([1 ..] :: [Integer])
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doParen :: Bool -> String -> String
doParen False s = s
doParen True s = if ' ' `elem` s then '(':s ++ ")" else s
isSearchedVar :: Id -> G.HsExpr Id -> Bool
isSearchedVar i (G.HsVar i2) = i == i2
isSearchedVar _ _ = False
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----------------------------------------------------------------
-- REFINE AUTOMATICALLY
----------------------------------------------------------------
auto :: IOish m
=> FilePath -- ^ A target file.
-> Int -- ^ Line number.
-> Int -- ^ Column number.
-> GhcModT m String
auto file lineNo colNo = ghandle handler body
where
body = inModuleContext file $ \dflag style -> do
opt <- options
modSum <- Gap.fileModSummary file
p <- G.parseModule modSum
tcm@TypecheckedModule{tm_typechecked_source = tcs
,tm_checked_module_info = minfo} <- G.typecheckModule p
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whenFound' opt (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 not $ funName `elem` 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))
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handler (SomeException _) = emptyResult =<< options
-- 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])
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_ -> (error "This should never happen", [])
G.FunBind { Ty.fun_id = L _ funId } ->
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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
(L _ (G.Match pats _ _):_) = m
in (funId, pats)
_ -> (error "This should never happen", [])
getBindingsForPat :: Ty.Pat Id -> M.Map G.Name Type
getBindingsForPat (Ty.VarPat i) = M.singleton (G.getName i) (Ty.varType i)
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)
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#if __GLASGOW_HASKELL__ >= 708
getBindingsForPat (Ty.ListPat l _ _) = M.unions $ map (\(L _ i) -> getBindingsForPat i) l
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#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
getBindingsForRecPat (Ty.PrefixCon args) = M.unions $ map (\(L _ i) -> getBindingsForPat i) args
getBindingsForRecPat (Ty.InfixCon (L _ a1) (L _ a2)) = M.union (getBindingsForPat a1) (getBindingsForPat a2)
getBindingsForRecPat (Ty.RecCon (Ty.HsRecFields { Ty.rec_flds = fields })) = getBindingsForRecFields fields
where getBindingsForRecFields [] = M.empty
getBindingsForRecFields (Ty.HsRecField { Ty.hsRecFieldArg = (L _ a) } : fs) =
M.union (getBindingsForPat a) (getBindingsForRecFields fs)