+{-# 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
( splitBy
, joinWith
, trim
- , noCaseEq
- , noCaseEq'
, isWhiteSpace
, quoteStr
, parseWWWFormURLEncoded
)
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"]
+-- |> 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
--- |@'noCaseEq' a b@ is equivalent to @(map toLower a) == (map toLower
--- b)@. See 'noCaseEq''.
-noCaseEq :: String -> String -> Bool
-noCaseEq a b
- = (map toLower a) == (map toLower b)
-{-# INLINE noCaseEq #-}
-
--- |@'noCaseEq'' a b@ is a variant of 'noCaseEq' which first checks
--- the length of two strings to avoid possibly unnecessary comparison.
-noCaseEq' :: String -> String -> Bool
-noCaseEq' a b
- | length a /= length b = False
- | otherwise = noCaseEq a b
-{-# INLINE noCaseEq' #-}
-
--- |@'isWhiteSpace' c@ is True iff c is one of SP, HT, CR and LF.
+-- |@'isWhiteSpace' c@ is 'Prelude.True' iff c is one of SP, HT, CR
+-- and LF.
isWhiteSpace :: Char -> Bool
isWhiteSpace ' ' = True
isWhiteSpace '\t' = True
-- > 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
)