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--------------------------------------------------------------------------------
module Language.Haskell.Stylish.Step.Cases
( step
) where
--------------------------------------------------------------------------------
import Data.Data (Data)
import Data.Maybe (maybeToList)
import qualified Language.Haskell.Exts.Annotated as H
--------------------------------------------------------------------------------
import Language.Haskell.Stylish.Align
import Language.Haskell.Stylish.Editor
import Language.Haskell.Stylish.Step
import Language.Haskell.Stylish.Util
--------------------------------------------------------------------------------
cases :: Data l => H.Module l -> [[H.Alt l]]
cases modu = [alts | H.Case _ _ alts <- everything modu]
--------------------------------------------------------------------------------
altToAlignable :: H.Alt l -> Maybe (Alignable l)
altToAlignable (H.Alt _ _ _ (Just _)) = Nothing
altToAlignable (H.Alt ann pat rhs Nothing) = Just $ Alignable
{ aContainer = ann
, aLeft = H.ann pat
, aRight = H.ann rhs
, aRightLead = length "-> "
}
--------------------------------------------------------------------------------
tlpats :: Data l => H.Module l -> [[H.Match l]]
tlpats modu = [matches | H.FunBind _ matches <- everything modu]
--------------------------------------------------------------------------------
matchToAlignable :: H.Match l -> Maybe (Alignable l)
matchToAlignable (H.InfixMatch _ _ _ _ _ _) = Nothing
matchToAlignable (H.Match _ _ [] _ _) = Nothing
matchToAlignable (H.Match _ _ _ _ (Just _)) = Nothing
matchToAlignable (H.Match ann name pats rhs Nothing) = Just $ Alignable
{ aContainer = ann
, aLeft = last (H.ann name : map H.ann pats)
, aRight = H.ann rhs
, aRightLead = length "= "
}
--------------------------------------------------------------------------------
step :: Int -> Step
step maxColumns = makeStep "Cases" $ \ls (module', _) ->
let module'' = fmap H.srcInfoSpan module'
changes search toAlign =
[ change_
| case_ <- search module''
, aligns <- maybeToList (mapM toAlign case_)
, change_ <- align maxColumns aligns
] in
applyChanges
(changes cases altToAlignable ++ changes tlpats matchToAlignable)
ls
|
