, joinWith
, trim
, noCaseEq
+ , noCaseEq'
, isWhiteSpace
, quoteStr
, parseWWWFormURLEncoded
)
where
-import Control.Monad.Trans
import Data.Char
import Data.List
-import Foreign
-import Foreign.C
import Network.URI
-- |> splitBy (== ':') "ab:c:def"
-- > ==> ["ab", "c", "def"]
splitBy :: (a -> Bool) -> [a] -> [[a]]
splitBy isSeparator src
- = case break isSeparator src
+ = isSeparator `seq`
+ case break isSeparator src
of (last , [] ) -> last : []
(first, sep:rest) -> first : splitBy isSeparator rest
-- > ==> "ab:c:def"
joinWith :: [a] -> [[a]] -> [a]
joinWith separator xs
- = foldr (++) [] $ intersperse separator xs
+ = separator `seq` xs `seq`
+ foldr (++) [] $! intersperse separator xs
-- |> trim (== '_') "__ab_c__def___"
-- > ==> "ab_c__def"
trim :: (a -> Bool) -> [a] -> [a]
-trim p = trimTail . trimHead
+trim p = p `seq` trimTail . trimHead
where
trimHead = dropWhile p
trimTail = reverse . trimHead . reverse
-- |@'noCaseEq' a b@ is equivalent to @(map toLower a) == (map toLower
--- b)@
+-- 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 :: Char -> Bool
-isWhiteSpace = flip elem " \t\r\n"
+isWhiteSpace ' ' = True
+isWhiteSpace '\t' = True
+isWhiteSpace '\r' = True
+isWhiteSpace '\n' = True
+isWhiteSpace _ = False
+{-# INLINE isWhiteSpace #-}
-- |> quoteStr "abc"
-- > ==> "\"abc\""
-- > quoteStr "ab\"c"
-- > ==> "\"ab\\\"c\""
quoteStr :: String -> String
-quoteStr str = foldr (++) "" (["\""] ++ map quote str ++ ["\""])
+quoteStr str = str `seq`
+ foldr (++) "" (["\""] ++ map quote str ++ ["\""])
where
quote :: Char -> String
quote '"' = "\\\""
parseWWWFormURLEncoded src
| src == "" = []
| otherwise = do pairStr <- splitBy (\ c -> c == ';' || c == '&') src
- let pair = break (== '=') pairStr
- return ( unEscapeString $ fst pair
- , unEscapeString $ snd pair
+ let (key, value) = break (== '=') pairStr
+ return ( unEscapeString key
+ , unEscapeString $ case value of
+ ('=':val) -> val
+ "" -> ""
)