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--------------------------------------------------------------------------------
{-# LANGUAGE PartialTypeSignatures #-}
{-# LANGUAGE PatternGuards #-}
{-# LANGUAGE TypeFamilies #-}
module Language.Haskell.Stylish.Step.Squash
( step
) where
--------------------------------------------------------------------------------
import Data.Maybe (mapMaybe)
import qualified GHC.Hs as Hs
import qualified SrcLoc as S
--------------------------------------------------------------------------------
import Language.Haskell.Stylish.Editor
import Language.Haskell.Stylish.Step
import Language.Haskell.Stylish.Util
--------------------------------------------------------------------------------
squash
:: (S.HasSrcSpan l, S.HasSrcSpan r)
=> l -> r -> Maybe (Change String)
squash left right = do
lAnn <- toRealSrcSpan $ S.getLoc left
rAnn <- toRealSrcSpan $ S.getLoc right
if S.srcSpanEndLine lAnn == S.srcSpanStartLine rAnn ||
S.srcSpanEndLine lAnn + 1 == S.srcSpanStartLine rAnn
then Just $
changeLine (S.srcSpanEndLine lAnn) $ \str ->
let (pre, post) = splitAt (S.srcSpanEndCol lAnn) str
in [trimRight pre ++ " " ++ trimLeft post]
else Nothing
--------------------------------------------------------------------------------
squashFieldDecl :: Hs.ConDeclField Hs.GhcPs -> Maybe (Change String)
squashFieldDecl (Hs.ConDeclField _ names type' _)
| null names = Nothing
| otherwise = squash (last names) type'
squashFieldDecl (Hs.XConDeclField x) = Hs.noExtCon x
--------------------------------------------------------------------------------
squashMatch :: Hs.Match Hs.GhcPs (Hs.LHsExpr Hs.GhcPs) -> Maybe (Change String)
squashMatch (Hs.Match _ (Hs.FunRhs name _ _) [] grhss) = do
body <- unguardedRhsBody grhss
squash name body
squashMatch (Hs.Match _ _ pats grhss) = do
body <- unguardedRhsBody grhss
squash (last pats) body
squashMatch (Hs.XMatch x) = Hs.noExtCon x
--------------------------------------------------------------------------------
step :: Step
step = makeStep "Squash" $ \ls (module') ->
let changes =
mapMaybe squashFieldDecl (everything module') ++
mapMaybe squashMatch (everything module') in
applyChanges changes ls
|
