HaRe-0.8.3.0: src/Language/Haskell/Refact/Refactoring/SwapArgs.hs
{-# LANGUAGE CPP #-}
{-# LANGUAGE ScopedTypeVariables #-}
module Language.Haskell.Refact.Refactoring.SwapArgs (swapArgs) where
import qualified Data.Generics.Aliases as SYB
import qualified GHC.SYB.Utils as SYB
import qualified Name as GHC
import qualified GHC
import qualified Language.Haskell.GhcMod as GM (Options(..))
import Language.Haskell.Refact.API
import Data.Generics.Schemes
import Language.Haskell.GHC.ExactPrint.Types
import System.Directory
-- TODO: replace args with specific parameters
swapArgs :: RefactSettings -> GM.Options -> [String] -> IO [FilePath]
swapArgs settings opts args
= do let fileName = args!!0
row = (read (args!!1)::Int)
col = (read (args!!2)::Int)
absFileName <- canonicalizePath fileName
runRefacSession settings opts (comp absFileName (row,col))
comp :: String -> SimpPos
-> RefactGhc [ApplyRefacResult]
comp fileName (row, col) = do
parseSourceFileGhc fileName
parsed <- getRefactParsed
nm <- getRefactNameMap
let name = locToNameRdrPure nm (row, col) parsed
case name of
-- (Just pn) -> do refactoredMod@(_, (_t, s)) <- applyRefac (doSwap pnt pn) (Just modInfo) fileName
(Just pn) -> do
(refactoredMod,_) <- applyRefac (doSwap pn) (RSFile fileName)
return [refactoredMod]
Nothing -> error "Incorrect identifier selected!"
--if isFunPNT pnt mod -- Add this back in ++ CMB +++
-- then do
-- rs <-if isExported pnt exps
-- then applyRefacToClientMods (doSwap pnt) fileName
-- else return []
-- writeRefactoredFiles False (r:rs)
-- else error "\nInvalid cursor position!"
-- putStrLn (showToks t)
-- writeRefactoredFiles False [refactoredMod]
-- putStrLn ("here" ++ (SYB.showData SYB.Parser 0 mod)) -- $ show [fileName, beginPos, endPos]
-- putStrLn "Completd"
doSwap :: GHC.Name -> RefactGhc ()
doSwap n1 = do
parsed <- getRefactParsed
logm $ "doSwap:parsed=" ++ SYB.showData SYB.Parser 0 parsed
nm <- getRefactNameMap
parsed' <- everywhereM (SYB.mkM (inMod nm)
`SYB.extM` (inExp nm)
`SYB.extM` (inType nm)
`SYB.extM` (inTypeDecl nm)
) parsed
-- this needs to be bottom up +++ CMB +++
putRefactParsed parsed' emptyAnns
return ()
where
-- 1. The definition is at top level...
#if __GLASGOW_HASKELL__ <= 710
inMod nm ((GHC.FunBind ln2 infixity (GHC.MG matches p m1 m2) a locals tick)::GHC.HsBind GHC.RdrName)
#else
inMod nm ((GHC.FunBind ln2 (GHC.MG (GHC.L lm matches) p m1 m2) a locals tick)::GHC.HsBind GHC.RdrName)
#endif
| GHC.nameUnique n1 == GHC.nameUnique (rdrName2NamePure nm ln2)
= do logm ("inMatch>" ++ SYB.showData SYB.Parser 0 ln2 ++ "<")
newMatches <- updateMatches matches
#if __GLASGOW_HASKELL__ <= 710
return (GHC.FunBind ln2 infixity (GHC.MG newMatches p m1 m2) a locals tick)
#else
return (GHC.FunBind ln2 (GHC.MG (GHC.L lm newMatches) p m1 m2) a locals tick)
#endif
inMod _ func = return func
-- 2. All call sites of the function...
inExp nm ((GHC.L l (GHC.HsApp (GHC.L e0 (GHC.HsApp e e1)) e2))::GHC.LHsExpr GHC.RdrName)
| cond
-- = update e2 e1 =<< update e1 e2 expr
= do
-- expr1 <- update e1 e2 expr
-- expr2 <- update e2 e1 expr1
-- return expr2
return (GHC.L l (GHC.HsApp (GHC.L e0 (GHC.HsApp e e2)) e1))
where
cond = case (expToNameRdr nm e) of
Nothing -> False
Just n2 -> GHC.nameUnique n2 == GHC.nameUnique n1
inExp _ e = return e
-- 3. Type signature...
#if __GLASGOW_HASKELL__ <= 710
inType nm (GHC.L x (GHC.TypeSig [lname] types pns)::GHC.LSig GHC.RdrName)
#else
inType nm (GHC.L x (GHC.TypeSig [lname] (GHC.HsIB ivs (GHC.HsWC wcs mwc types)))::GHC.LSig GHC.RdrName)
#endif
| GHC.nameUnique (rdrName2NamePure nm lname) == GHC.nameUnique n1
= do
logm $ "doSwap.inType"
let (t1:t2:ts) = tyFunToList types
-- t1' <- update t1 t2 t1
-- t2' <- update t2 t1 t2
let t1' = t2
let t2' = t1
#if __GLASGOW_HASKELL__ <= 710
return (GHC.L x (GHC.TypeSig [lname] (tyListToFun (t1':t2':ts)) pns))
#else
return (GHC.L x (GHC.TypeSig [lname] (GHC.HsIB ivs (GHC.HsWC wcs mwc (tyListToFun (t1':t2':ts))))))
#endif
#if __GLASGOW_HASKELL__ <= 710
inType nm (GHC.L _x (GHC.TypeSig (n:ns) _types _)::GHC.LSig GHC.RdrName)
#else
inType nm (GHC.L _x (GHC.TypeSig (n:ns) _types )::GHC.LSig GHC.RdrName)
#endif
| GHC.nameUnique n1 `elem` (map (\n' -> GHC.nameUnique (rdrName2NamePure nm n')) (n:ns))
= error "Error in swapping arguments in type signature: signature bound to muliple entities!"
inType _ ty = return ty
inTypeDecl nm (GHC.L l (GHC.SigD s)) = do
(GHC.L _ s') <- inType nm (GHC.L l s)
return (GHC.L l (GHC.SigD s'))
inTypeDecl _ x = return x
#if __GLASGOW_HASKELL__ <= 710
tyFunToList (GHC.L _ (GHC.HsForAllTy _ _ _ _ (GHC.L _ (GHC.HsFunTy t1 t2)))) = t1 : (tyFunToList t2)
#else
tyFunToList (GHC.L _ (GHC.HsForAllTy _ (GHC.L _ (GHC.HsFunTy t1 t2)))) = t1 : (tyFunToList t2)
#endif
tyFunToList (GHC.L _ (GHC.HsFunTy t1 t2)) = t1 : (tyFunToList t2)
tyFunToList t = [t]
tyListToFun [] = error "SwapArgs.tyListToFun" -- Keep the exhaustiveness checker happy
tyListToFun [t1] = t1
tyListToFun (t1:ts) = GHC.noLoc (GHC.HsFunTy t1 (tyListToFun ts))
updateMatches [] = return []
updateMatches ((GHC.L x (GHC.Match mfn pats nothing rhs)::GHC.LMatch GHC.RdrName (GHC.LHsExpr GHC.RdrName)):matches)
= case pats of
(p1:p2:ps) -> do
-- p1' <- update p1 p2 p1
-- p2' <- update p2 p1 p2
let p1' = p2
let p2' = p1
matches' <- updateMatches matches
return ((GHC.L x (GHC.Match mfn (p1':p2':ps) nothing rhs)):matches')
[p] -> return [GHC.L x (GHC.Match mfn [p] nothing rhs)]
[] -> return [GHC.L x (GHC.Match mfn [] nothing rhs)]