+{-# LANGUAGE
+ BangPatterns
+ , UnicodeSyntax
+ #-}
-- |Utility functions used internally in the Lucu httpd. These
-- functions may be useful too for something else.
module Network.HTTP.Lucu.Utils
)
where
-import Data.Char
-import Data.List
+import Control.Monad
+import Data.List hiding (last)
import Network.URI
+import Prelude hiding (last)
-- |> splitBy (== ':') "ab:c:def"
-- > ==> ["ab", "c", "def"]
splitBy :: (a -> Bool) -> [a] -> [[a]]
-splitBy isSeparator src
- = isSeparator `seq`
- case break isSeparator src
- of (last , [] ) -> last : []
- (first, sep:rest) -> first : splitBy isSeparator rest
+splitBy isSep src
+ = case break isSep src
+ of (last , [] ) -> [last]
+ (first, _sep:rest) -> first : splitBy isSep rest
-- |> joinWith ":" ["ab", "c", "def"]
-- > ==> "ab:c:def"
joinWith :: [a] -> [[a]] -> [a]
-joinWith separator xs
- = separator `seq` xs `seq`
- foldr (++) [] $! intersperse separator xs
+joinWith = (join .) . intersperse
-- |> trim (== '_') "__ab_c__def___"
-- > ==> "ab_c__def"
trim :: (a -> Bool) -> [a] -> [a]
-trim p = p `seq` trimTail . trimHead
+trim !p = trimTail . trimHead
where
trimHead = dropWhile p
trimTail = reverse . trimHead . reverse
-- > quoteStr "ab\"c"
-- > ==> "\"ab\\\"c\""
quoteStr :: String -> String
-quoteStr str = str `seq`
- foldr (++) "" (["\""] ++ map quote str ++ ["\""])
+quoteStr !str = concat (["\""] ++ map quote str ++ ["\""])
where
quote :: Char -> String
quote '"' = "\\\""
return ( unEscapeString key
, unEscapeString $ case value of
('=':val) -> val
- "" -> ""
+ val -> val
)