136 lines
4.6 KiB
Haskell
136 lines
4.6 KiB
Haskell
{-# LANGUAGE CPP, FlexibleInstances, FlexibleContexts #-}
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module Language.Haskell.GhcMod.Convert (convert, convert', emptyResult, whenFound, whenFound') where
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import Language.Haskell.GhcMod.Monad
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import Language.Haskell.GhcMod.Types
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import Control.Applicative ((<$>))
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type Builder = String -> String
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-- |
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--
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-- >>> replace '"' "\\\"" "foo\"bar" ""
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-- "foo\\\"bar"
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replace :: Char -> String -> String -> Builder
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replace _ _ [] = id
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replace c cs (x:xs)
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| x == c = (cs ++) . replace c cs xs
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| otherwise = (x :) . replace c cs xs
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inter :: Char -> [Builder] -> Builder
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inter _ [] = id
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inter c bs = foldr1 (\x y -> x . (c:) . y) bs
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convert' :: (ToString a, IOish m) => a -> GhcModT m String
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convert' x = flip convert x <$> options
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convert :: ToString a => Options -> a -> String
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convert opt@Options { outputStyle = LispStyle } x = toLisp opt x "\n"
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convert opt@Options { outputStyle = PlainStyle } x
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| str == "\n" = ""
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| otherwise = str
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where
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str = toPlain opt x "\n"
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class ToString a where
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toLisp :: Options -> a -> Builder
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toPlain :: Options -> a -> Builder
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lineSep :: Options -> String
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lineSep opt = interpret lsep
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where
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interpret s = read $ "\"" ++ s ++ "\""
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LineSeparator lsep = lineSeparator opt
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-- |
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--
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-- >>> toLisp defaultOptions "fo\"o" ""
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-- "\"fo\\\"o\""
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-- >>> toPlain defaultOptions "foo" ""
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-- "foo"
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instance ToString String where
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toLisp opt = quote opt
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toPlain opt = replace '\n' (lineSep opt)
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-- |
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--
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-- >>> toLisp defaultOptions ["foo", "bar", "ba\"z"] ""
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-- "(\"foo\" \"bar\" \"ba\\\"z\")"
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-- >>> toPlain defaultOptions ["foo", "bar", "baz"] ""
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-- "foo\nbar\nbaz"
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instance ToString [String] where
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toLisp opt = toSexp1 opt
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toPlain opt = inter '\n' . map (toPlain opt)
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-- |
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--
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-- >>> let inp = [((1,2,3,4),"foo"),((5,6,7,8),"bar")] :: [((Int,Int,Int,Int),String)]
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-- >>> toLisp defaultOptions inp ""
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-- "((1 2 3 4 \"foo\") (5 6 7 8 \"bar\"))"
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-- >>> toPlain defaultOptions inp ""
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-- "1 2 3 4 \"foo\"\n5 6 7 8 \"bar\""
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instance ToString [((Int,Int,Int,Int),String)] where
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toLisp opt = toSexp2 . map toS
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where
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toS x = ('(' :) . tupToString opt x . (')' :)
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toPlain opt = inter '\n' . map (tupToString opt)
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instance ToString ((Int,Int,Int,Int),String) where
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toLisp opt x = ('(' :) . tupToString opt x . (')' :)
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toPlain opt x = tupToString opt x
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instance ToString ((Int,Int,Int,Int),[String]) where
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toLisp opt (x,s) = ('(' :) . fourIntsToString opt x .
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(' ' :) . toLisp opt s . (')' :)
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toPlain opt (x,s) = fourIntsToString opt x . ('\n' :) . toPlain opt s
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instance ToString (String, (Int,Int,Int,Int),[String]) where
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toLisp opt (s,x,y) = toSexp2 [toLisp opt s, ('(' :) . fourIntsToString opt x . (')' :), toLisp opt y]
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toPlain opt (s,x,y) = inter '\n' [toPlain opt s, fourIntsToString opt x, toPlain opt y]
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toSexp1 :: Options -> [String] -> Builder
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toSexp1 opt ss = ('(' :) . inter ' ' (map (quote opt) ss) . (')' :)
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toSexp2 :: [Builder] -> Builder
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toSexp2 ss = ('(' :) . inter ' ' ss . (')' :)
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fourIntsToString :: Options -> (Int,Int,Int,Int) -> Builder
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fourIntsToString _ (a,b,c,d) = (show a ++) . (' ' :)
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. (show b ++) . (' ' :)
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. (show c ++) . (' ' :)
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. (show d ++)
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tupToString :: Options -> ((Int,Int,Int,Int),String) -> Builder
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tupToString opt ((a,b,c,d),s) = (show a ++) . (' ' :)
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. (show b ++) . (' ' :)
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. (show c ++) . (' ' :)
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. (show d ++) . (' ' :)
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. quote opt s -- fixme: quote is not necessary
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quote :: Options -> String -> Builder
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quote opt str = ("\"" ++) . (quote' str ++) . ("\"" ++)
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where
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lsep = lineSep opt
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quote' [] = []
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quote' (x:xs)
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| x == '\n' = lsep ++ quote' xs
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| x == '\\' = "\\\\" ++ quote' xs
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| x == '"' = "\\\"" ++ quote' xs
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| otherwise = x : quote' xs
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----------------------------------------------------------------
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-- Empty result to be returned when no info can be gathered
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emptyResult :: Monad m => Options -> m String
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emptyResult opt = return $ convert opt ([] :: [String])
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-- Return an emptyResult when Nothing
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whenFound :: (Monad m, ToString b) => Options -> m (Maybe a) -> (a -> b) -> m String
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whenFound opt from f = maybe (emptyResult opt) (return . convert opt . f) =<< from
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-- Return an emptyResult when Nothing, inside a monad
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whenFound' :: (Monad m, ToString b) => Options -> m (Maybe a) -> (a -> m b) -> m String
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whenFound' opt from f = maybe (emptyResult opt) (\x -> do y <- f x ; return (convert opt y)) =<< from
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