Rakka.Utils

[Rakka.git] / Rakka / Utils.hs

diff --git a/Rakka/Utils.hs b/Rakka/Utils.hs
index 9eb667c115971c10d816f0176e8d9bda2b4a1632..e89fee08c381e21c66bdd498556442915a64e047 100644 (file)
--- a/Rakka/Utils.hs
+++ b/Rakka/Utils.hs
@@ -1,43 +1,133 @@
+{-# LANGUAGE
+    Arrows
+  , UnicodeSyntax
+  #-}
 module Rakka.Utils
     ( yesOrNo
+    , trueOrFalse
     , parseYesOrNo
     , maybeA
     , deleteIfEmpty
     , chomp
+    , guessMIMEType
+    , mkQueryString
     )
     where
+import Control.Arrow
+import Control.Arrow.ArrowList
+import Data.Ascii (Ascii)
+import qualified Data.Ascii as A
+import qualified Data.ByteString as BS
+import qualified Data.ByteString.Char8 as C8
+import qualified Data.ByteString.Unsafe as BS
+import qualified Data.ByteString.Lazy as LS
+import Data.Char
+import qualified Data.Text as T
+import Data.Text.Encoding
+import Magic
+import Network.HTTP.Lucu
+import Network.URI
+import Numeric
+import Prelude.Unicode
+import System.IO.Unsafe
 
-import           Control.Arrow
-import           Control.Arrow.ArrowList
-
-
-yesOrNo :: Bool -> String
+yesOrNo ∷ Bool → String
 yesOrNo True  = "yes"
 yesOrNo False = "no"
 
+trueOrFalse ∷ Bool → String
+trueOrFalse True  = "true"
+trueOrFalse False = "false"
 
-parseYesOrNo :: ArrowChoice a => a String Bool
+parseYesOrNo ∷ ArrowChoice a ⇒ a String Bool
 parseYesOrNo 
-    = proc str -> do case str of
-                       "yes" -> returnA -< True
-                       "no"  -> returnA -< False
-                       _     -> returnA -< error ("Expected yes or no: " ++ str)
+    = proc str → do case str of
+                       "yes" → returnA ⤙ True
+                       "no"  → returnA ⤙ False
+                       _     → returnA ⤙ error ("Expected yes or no: " ⧺ str)
 
-
-maybeA :: (ArrowList a, ArrowChoice a) => a b c -> a b (Maybe c)
+maybeA ∷ (ArrowList a, ArrowChoice a) ⇒ a b c → a b (Maybe c)
 maybeA a = listA a
            >>>
-           proc xs -> case xs of
-                        []    -> returnA -< Nothing
-                        (x:_) -> returnA -< Just x
-
+           proc xs → case xs of
+                        []    → returnA ⤙ Nothing
+                        (x:_) → returnA ⤙ Just x
 
-deleteIfEmpty :: (ArrowList a, ArrowChoice a) => a String String
+deleteIfEmpty ∷ (ArrowList a, ArrowChoice a) ⇒ a String String
 deleteIfEmpty
-    = proc str -> do case str of
-                       "" -> none    -< ()
-                       _  -> returnA -< str
+    = proc str → do case str of
+                       "" → none    ⤙ ()
+                       _  → returnA ⤙ str
+
+chomp ∷ String → String
+{-# INLINE chomp #-}
+chomp = reverse . snd . break (≢ '\n') . reverse
+
+guessMIMEType ∷ LS.ByteString → MIMEType
+{-# INLINEABLE guessMIMEType #-}
+guessMIMEType = read
+                ∘ unsafePerformIO
+                ∘ flip BS.unsafeUseAsCStringLen (magicCString magic)
+                ∘ BS.concat
+                ∘ LS.toChunks
+    where
+      magic ∷ Magic
+      {-# NOINLINE magic #-}
+      magic = unsafePerformIO
+              $ do m ← magicOpen [MagicMime]
+                   magicLoadDefault m
+                   return m
+
+{-
+isSafeChar ∷ Char → Bool
+{-# INLINEABLE isSafeChar #-}
+isSafeChar c
+    | c ≡ '/'           = True
+    | isReserved c      = False
+    | c > ' ' ∧ c ≤ '~' = True
+    | otherwise         = False
+-}
+
+mkQueryString ∷ [(T.Text, T.Text)] → Ascii
+{-# INLINEABLE mkQueryString #-}
+mkQueryString = A.unsafeFromByteString
+                ∘ BS.intercalate (C8.singleton ';')
+                ∘ map encodePair
+    where
+      encodePair ∷ (T.Text, T.Text) → BS.ByteString
+      {-# INLINE encodePair #-}
+      encodePair (k, v)
+          = BS.intercalate (C8.singleton '=') [encodeText k, encodeText v]
+
+      encodeText ∷ T.Text → BS.ByteString
+      {-# INLINE encodeText #-}
+      encodeText = toURLEncoded ∘ encodeUtf8
+
+toURLEncoded ∷ BS.ByteString → BS.ByteString
+{-# INLINEABLE toURLEncoded #-}
+toURLEncoded = C8.concatMap go
+    where
+      go ∷ Char → BS.ByteString
+      {-# INLINE go #-}
+      go c | c ≡ ' '        = C8.singleton '+'
+           | isReserved   c = urlEncode c
+           | isUnreserved c = C8.singleton c
+           | otherwise      = urlEncode c
+
+      urlEncode ∷ Char → BS.ByteString
+      {-# INLINE urlEncode #-}
+      urlEncode c = C8.pack ('%':toHex (ord c))
 
+      toHex ∷ Int → String
+      {-# INLINE toHex #-}
+      toHex n
+          = case showIntAtBase 16 toChrHex n "" of
+              []  → "00"
+              [c] → ['0', c]
+              cs  → cs
 
-chomp :: String -> String
-chomp = reverse . snd . break (/= '\n') . reverse
+      toChrHex ∷ Int → Char
+      {-# INLINE toChrHex #-}
+      toChrHex d
+          | d < 10    = chr (ord '0' + fromIntegral  d    )
+          | otherwise = chr (ord 'A' + fromIntegral (d-10))