module Language.Haskell.Tools.Refactor.ListOperations where
import Control.Reference
import Control.Applicative
import Control.Monad.IO.Class
import Data.List (findIndices)
import Language.Haskell.Tools.AST
import Language.Haskell.Tools.AST.Rewrite (AnnList)
import Language.Haskell.Tools.Transform
import Language.Haskell.Tools.Refactor.RefactorBase
import Language.Haskell.Tools.Refactor.ChangeAST
import SrcLoc
filterList :: SourceInfoTraversal e => (Ann e dom SrcTemplateStage -> Bool) -> AnnList e dom -> AnnList e dom
filterList pred = filterListIndexed (const pred)
filterListIndexed :: SourceInfoTraversal e => (Int -> Ann e dom SrcTemplateStage -> Bool) -> AnnList e dom -> AnnList e dom
filterListIndexed pred (AnnListG (NodeInfo sema src) elems)
= AnnListG (NodeInfo sema (srcTmpIndented .- fmap filterIndents $ srcTmpSeparators .- filterSeparators $ src)) filteredElems
where elementsKept = findIndices (uncurry pred) (zip [0..] elems)
filteredElems = sublist elementsKept elems
filterIndents = sublist elementsKept
filterSeparators = take (length elementsKept 1) . sublist elementsKept
filterListSt :: SourceInfoTraversal e => (Ann e dom SrcTemplateStage -> Bool) -> AnnList e dom -> LocalRefactor dom (AnnList e dom)
filterListSt pred = filterListIndexedSt (const pred)
filterListIndexedSt :: SourceInfoTraversal e => (Int -> Ann e dom SrcTemplateStage -> Bool) -> AnnList e dom -> LocalRefactor dom (AnnList e dom)
filterListIndexedSt pred (AnnListG (NodeInfo sema src) elems)
= do mapM_ removeChild removedElems
mapM_ removeSeparator removedSeparators
return $ AnnListG (NodeInfo sema (srcTmpIndented .- fmap filterIndents $ srcTmpSeparators .- filterSeparators $ src)) filteredElems
where elementsKept = findIndices (uncurry pred) (zip [0..] elems)
filteredElems = sublist elementsKept elems
removedSeparators :: [([SourceTemplateTextElem], SrcSpan)]
removedSeparators = notSublist elementsKept (src ^. srcTmpSeparators) ++ lastSepRemoved
lastSepRemoved = if (length elems 1) `notElem` elementsKept
then take 1 (reverse (sublist elementsKept $ src ^. srcTmpSeparators)) else []
removedElems = notSublist elementsKept elems
filterIndents = sublist elementsKept
filterSeparators = take (length elementsKept 1) . sublist elementsKept
sublist :: [Int] -> [a] -> [a]
sublist indices = map snd . filter ((`elem` indices) . fst) . zip [0..]
notSublist :: [Int] -> [a] -> [a]
notSublist indices = map snd . filter ((`notElem` indices) . fst) . zip [0..]
insertWhere :: Bool -> Ann e dom SrcTemplateStage -> (Maybe (Ann e dom SrcTemplateStage) -> Bool)
-> (Maybe (Ann e dom SrcTemplateStage) -> Bool) -> AnnList e dom
-> AnnList e dom
insertWhere indented e before after al
= let index = insertIndex before after (al ^? annList)
in case index of
Nothing -> al
Just ind -> annListElems .- insertAt ind e
$ (if isEmptyAnnList then id else annListAnnot&sourceInfo .- setIndented ind . addDefaultSeparator ind)
$ al
where setIndented i = srcTmpIndented .- fmap (insertAt i indented)
addDefaultSeparator i al = srcTmpSeparators .- insertAt i ([NormalText $ al ^. srcTmpDefaultSeparator], noSrcSpan) $ al
insertAt n e ls = let (bef,aft) = splitAt n ls in bef ++ [e] ++ aft
isEmptyAnnList = (null :: [x] -> Bool) $ (al ^? annList)
insertIndex :: (Maybe (Ann e dom SrcTemplateStage) -> Bool) -> (Maybe (Ann e dom SrcTemplateStage) -> Bool) -> [Ann e dom SrcTemplateStage] -> Maybe Int
insertIndex before after []
| before Nothing && after Nothing = Just 0
| otherwise = Nothing
insertIndex before after list@(first:_)
| before Nothing && after (Just first) = Just 0
| otherwise = (+1) <$> insertIndex' before after list
where insertIndex' before after (curr:rest@(next:_))
| before (Just curr) && after (Just next) = Just 0
| otherwise = (+1) <$> insertIndex' before after rest
insertIndex' before after (curr:[])
| before (Just curr) && after Nothing = Just 0
| otherwise = Nothing
insertIndex' before after []
| before Nothing && after Nothing = Just 0
| otherwise = Nothing
zipWithSeparators :: AnnList e dom -> [(([SourceTemplateTextElem], SrcSpan), Ann e dom SrcTemplateStage)]
zipWithSeparators (AnnListG (NodeInfo _ src) elems)
| [] <- src ^. srcTmpSeparators
= zip (([], noSrcSpan) : repeat ([NormalText $ src ^. srcTmpDefaultSeparator], noSrcSpan)) elems
| otherwise
= zip (([], noSrcSpan) : seps ++ repeat (_2 .= noSrcSpan $ last seps)) elems
where seps = src ^. srcTmpSeparators