X-Git-Url: http://git.cielonegro.org/gitweb.cgi?a=blobdiff_plain;f=Network%2FHTTP%2FLucu%2FUtils.hs;h=dbc65ac17ad8a52f553af26e5506a33df9aab137;hb=3177a876bea6b8a2c34f51cc96c98c2cbb1e4aa9;hp=5dc1584683b5b23082cc3ae63cbd57ad293fe2e2;hpb=854f6d1709d468f7e1bf0db2dcd2d30de6bd5f5e;p=Lucu.git

diff --git a/Network/HTTP/Lucu/Utils.hs b/Network/HTTP/Lucu/Utils.hs
index 5dc1584..dbc65ac 100644
--- a/Network/HTTP/Lucu/Utils.hs
+++ b/Network/HTTP/Lucu/Utils.hs
@@ -1,52 +1,84 @@
+{-# 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      -- (a -> Bool) -> [a] -> [[a]]
-    , joinWith     -- [a] -> [[a]] -> [a]
-    , trim         -- (a -> Bool) -> [a] -> [a]
-    , noCaseEq     -- String -> String -> Bool
-    , isWhiteSpace -- Char -> Bool
-    , quoteStr     -- String -> String
+    ( splitBy
+    , joinWith
+    , trim
+    , isWhiteSpace
+    , quoteStr
+    , parseWWWFormURLEncoded
     )
     where
-
-import Control.Monad.Trans
-import Data.Char
-import Data.List
-import Foreign
-import Foreign.C
+import Control.Monad
+import Data.List     hiding (last)
 import Network.URI
+import Prelude       hiding (last)
+import Prelude.Unicode
 
-
+-- |> splitBy (== ':') "ab:c:def"
+--  > ==> ["ab", "c", "def"]
 splitBy :: (a -> Bool) -> [a] -> [[a]]
-splitBy isSeparator src
-    = 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
-    = foldr (++) [] $ intersperse separator xs
-
+joinWith = (join .) . intersperse
 
+-- |> trim (== '_') "__ab_c__def___"
+--  > ==> "ab_c__def"
 trim :: (a -> Bool) -> [a] -> [a]
-trim p = trimTail . trimHead
+trim !p = trimTail . trimHead
     where
       trimHead = dropWhile p
       trimTail = reverse . trimHead . reverse
 
-
-noCaseEq :: String -> String -> Bool
-noCaseEq a b
-    = (map toLower a) == (map toLower b)
-
-
+-- |@'isWhiteSpace' c@ is 'Prelude.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 = concat (["\""] ++ map quote str ++ ["\""])
     where
       quote :: Char -> String
       quote '"' = "\\\""
-      quote c   = [c]
\ No newline at end of file
+      quote c   = [c]
+
+
+-- |> parseWWWFormURLEncoded "aaa=bbb&ccc=ddd"
+--  > ==> [("aaa", "bbb"), ("ccc", "ddd")]
+parseWWWFormURLEncoded ∷ String → [(String, String)]
+parseWWWFormURLEncoded src
+    | null src  = []
+    | otherwise = do pairStr ← splitBy (\ c → c ≡ ';' ∨ c ≡ '&') src
+                     let (key, value) = break (≡ '=') pairStr
+                     return ( unescape key
+                            , unescape $ case value of
+                                           ('=':val) → val
+                                           val       → val
+                            )
+    where
+      unescape ∷ String → String
+      unescape = unEscapeString ∘ map plusToSpace
+
+      plusToSpace ∷ Char → Char
+      plusToSpace '+' = ' '
+      plusToSpace c   = c