{-# LANGUAGE LambdaCase #-}
module ExtensionOrganizerTest.AnnotationParser
-- (getLocalExtensionAnnotations, getGlobalExtensionAnnotations)
where
import ExtensionOrganizerTest.Parser
import Data.List
import qualified Data.Map.Strict as SMap (Map, empty, insertWith)
import Language.Haskell.Tools.Refactor.Utils.Extensions (canonExt)
import Language.Haskell.Tools.Refactor.Builtin.ExtensionOrganizer.ExtMap
{-# ANN module "HLint: ignore Use zipWith" #-}
getGlobalExtensionAnnotations :: String -> [Extension]
getGlobalExtensionAnnotations s
| [] <- getGlobalAnnot s = []
| otherwise = parseGlobalAnnot . getGlobalAnnot $ s
-- | Parses a file, collects occurences mapped to extension formulas
-- , transform them into formulas mapped to occurences.
getLocalExtensionAnnotations :: String -> SMap.Map (LogicalRelation Extension) [Occurence Int]
getLocalExtensionAnnotations s = foldl f SMap.empty (parseFile s)
where f m (occ, exts) = foldl (g occ) m exts
g occ m' ext = SMap.insertWith (++) ext [occ] m'
parseFile :: String -> [(Occurence Int, [LogicalRelation Extension])] -- SMap.Map Extension [Int]
parseFile = concatMap (separateOccurences . parseLine) . zip [1..] . lines
-- | Separates the occurences into hints and evidence.
-- The resulting list will always contain three elements
separateOccurences :: (Int, [Occurence (LogicalRelation Extension)]) ->
[(Occurence Int, [LogicalRelation Extension])]
separateOccurences (ln, occs) = [(Evidence ln, evs'), (Hint ln, hints'), (Hint ln, mis')]
where evs = filter (\case Evidence{} -> True; _ -> False;) occs
hints = filter (\case Hint{} -> True; _ -> False;) occs
mis = filter (\case MissingInformation{} -> True; _ -> False;) occs
evs' = map fromOcc evs
hints' = map fromOcc hints
mis' = map fromOcc mis
fromOcc (Evidence x) = x
fromOcc (Hint x) = x
fromOcc (MissingInformation x) = x
parseLine :: (Int, String) -> (Int, [Occurence (LogicalRelation Extension)])
parseLine (num, line) = (num, parseLocalAnnot . getLocalAnnot $ line)
parseLocalAnnot :: String -> [Occurence (LogicalRelation Extension)]
parseLocalAnnot = map parseRelation . prepareAnnot
parseRelation :: String -> Occurence (LogicalRelation Extension)
parseRelation = execParser relation
parseGlobalAnnot :: String -> [Extension]
parseGlobalAnnot = map read . delimit (== ',')
getGlobalAnnot :: String -> String
getGlobalAnnot = getAnnot "{-@" "@-}"
getLocalAnnot :: String -> String
getLocalAnnot = getAnnot "{-*" "*-}"
getAnnot :: String -> String -> String -> String
getAnnot start end = concat . takeWhile (not . isPrefixOf end) . tail' . dropWhile (not . isPrefixOf start ) . words
where tail' [] = []
tail' xs = tail xs
delimit :: (a -> Bool) -> [a] -> [[a]]
delimit pred xs = delimit' pred xs []
delimit' :: (a -> Bool) -> [a] -> [[a]] -> [[a]]
delimit' _ [] acc = acc
delimit' pred xs acc = delimit' pred l2 (acc ++ [l1])
where (l1, l2) = break' pred xs
-- exludes the element for which the predicate is true
break' _ xs@[] = (xs, xs)
break' p (x:xs')
| p x = ([],xs')
| otherwise = let (ys,zs) = break' p xs' in (x:ys,zs)
---------
prepareAnnot :: String -> [String]
prepareAnnot = map (filter (not . isSpace)) . delimit (== ',')
crop :: String -> String
crop = dropWhile isSpace . reverse . dropWhile isSpace . reverse
relation :: Parser (Occurence (LogicalRelation Extension))
relation = Hint <$> (token "(" *> relation' <* token ")")
<|> MissingInformation <$> (token "[" *> relation' <* token "]")
<|> Evidence <$> relation'
-- | A relation parser that tries to reduce the left-hand side of operators,
-- before applíing the left-recursive rules.
-- Also the rules are a bit convoluted in order to respect the precedence
-- of the operators
relation' :: Parser (LogicalRelation Extension)
relation' = primRel
<|> (:&&:) <$> primRel <*> (token "*" *> primRel)
<|> (:||:) <$> primRel <*> (token "+" *> relation')
<|> (:||:) <$> relation' <*> (token "+" *> relation')
<|> (:&&:) <$> relation' <*> (token "*" *> relation')
<|> Not <$> (token "~" *> relation')
where primRel = (lVar . readExt) <$> word
<|> Not <$> (token "~" *> primRel)
readExt :: String -> Extension
readExt = read . canonExt