X-Git-Url: http://git.cielonegro.org/gitweb.cgi?a=blobdiff_plain;f=Network%2FHTTP%2FLucu%2FUtils.hs;h=55acf0adc481929338a4639c7c88118f614a7e76;hb=4e41b11;hp=ec4b6727f60567613549604a1c0e209d6d2a7727;hpb=db4b61223e0d8b34079d3b190fb3e3644b0b4866;p=Lucu.git

diff --git a/Network/HTTP/Lucu/Utils.hs b/Network/HTTP/Lucu/Utils.hs
index ec4b672..55acf0a 100644
--- a/Network/HTTP/Lucu/Utils.hs
+++ b/Network/HTTP/Lucu/Utils.hs
@@ -1,74 +1,83 @@
 {-# LANGUAGE
-    BangPatterns
-  , OverloadedStrings
+    OverloadedStrings
+  , RecordWildCards
+  , TemplateHaskell
   , 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
     , quoteStr
     , parseWWWFormURLEncoded
-    , show3
+    , splitPathInfo
+    , trim
+    , liftByteString
+    , liftLazyByteString
+    , liftAscii
+    , liftCIAscii
+    , liftText
+    , liftMap
+    , liftUTCTime
     )
     where
-import Blaze.ByteString.Builder.ByteString as B
-import Blaze.Text.Int as BT
 import Control.Monad
-import Data.Ascii (Ascii, AsciiBuilder)
+import Data.Ascii (Ascii, CIAscii, AsciiBuilder)
 import qualified Data.Ascii as A
 import Data.ByteString (ByteString)
-import qualified Data.ByteString.Char8 as BS
+import qualified Data.ByteString.Char8 as Strict
+import qualified Data.ByteString.Unsafe as Strict
+import qualified Data.ByteString.Lazy.Internal as Lazy
+import Data.Char
 import Data.List hiding (last)
+import Data.Map (Map)
+import qualified Data.Map as M
 import Data.Monoid.Unicode
+import Data.Ratio
+import Data.Text (Text)
+import qualified Data.Text as T
+import Data.Time
+import Language.Haskell.TH.Lib
+import Language.Haskell.TH.Syntax
 import Network.URI
 import Prelude hiding (last)
 import Prelude.Unicode
+import System.IO.Unsafe
 
--- |> splitBy (== ':') "ab:c:def"
---  > ==> ["ab", "c", "def"]
+-- |>>> splitBy (== ':') "ab:c:def"
+-- ["ab", "c", "def"]
 splitBy ∷ (a → Bool) → [a] → [[a]]
+{-# INLINEABLE splitBy #-}
 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 ∷ Ascii → [AsciiBuilder] → AsciiBuilder
-{-# INLINEABLE joinWith #-}
-joinWith sep = flip go (∅)
-    where
-      go ∷ [AsciiBuilder] → AsciiBuilder → AsciiBuilder
-      {-# INLINE go #-}
-      go []     ab = ab
-      go (x:[]) ab = ab ⊕ x
-      go (x:xs) ab = go xs (ab ⊕ A.toAsciiBuilder sep ⊕ x)
-
--- |> quoteStr "abc"
---  > ==> "\"abc\""
+    = case break isSep src of
+        (last , []       ) → [last]
+        (first, _sep:rest) → first : splitBy isSep rest
+
+-- |>>> quoteStr "abc"
+-- "\"abc\""
 --
---  > quoteStr "ab\"c"
---  > ==> "\"ab\\\"c\""
+-- >>> quoteStr "ab\"c"
+-- "\"ab\\\"c\""
 quoteStr ∷ Ascii → AsciiBuilder
 quoteStr str = A.toAsciiBuilder "\"" ⊕
                go (A.toByteString str) (∅) ⊕
                A.toAsciiBuilder "\""
     where
-      go ∷ BS.ByteString → AsciiBuilder → AsciiBuilder
+      go ∷ Strict.ByteString → AsciiBuilder → AsciiBuilder
       go bs ab
-          = case BS.break (≡ '"') bs of
+          = case Strict.break (≡ '"') bs of
               (x, y)
-                  | BS.null y → ab ⊕ b2ab x
-                  | otherwise → go (BS.tail y) (ab ⊕ b2ab x
-                                                   ⊕ A.toAsciiBuilder "\\\"")
+                  | Strict.null y
+                      → ab ⊕ b2ab x
+                  | otherwise
+                      → go (Strict.tail y)
+                           (ab ⊕ b2ab x ⊕ A.toAsciiBuilder "\\\"")
 
-      b2ab ∷ BS.ByteString → AsciiBuilder
+      b2ab ∷ Strict.ByteString → AsciiBuilder
       b2ab = A.toAsciiBuilder ∘ A.unsafeFromByteString
 
--- |> parseWWWFormURLEncoded "aaa=bbb&ccc=ddd"
---  > ==> [("aaa", "bbb"), ("ccc", "ddd")]
+-- |>>> parseWWWFormURLEncoded "aaa=bbb&ccc=ddd"
+-- [("aaa", "bbb"), ("ccc", "ddd")]
 parseWWWFormURLEncoded ∷ Ascii → [(ByteString, ByteString)]
 parseWWWFormURLEncoded src
     -- THINKME: We could gain some performance by using attoparsec
@@ -83,19 +92,92 @@ parseWWWFormURLEncoded src
                             )
     where
       unescape ∷ String → ByteString
-      unescape = BS.pack ∘ unEscapeString ∘ map plusToSpace
+      unescape = Strict.pack ∘ unEscapeString ∘ map plusToSpace
 
       plusToSpace ∷ Char → Char
       plusToSpace '+' = ' '
       plusToSpace c   = c
 
--- |> show3 5
---  > ==> "005"
-show3 ∷ Integral n ⇒ n → AsciiBuilder
-{-# INLINEABLE show3 #-}
-show3 = A.unsafeFromBuilder ∘ go
+-- |>>> splitPathInfo "http://example.com/foo/bar"
+-- ["foo", "bar"]
+splitPathInfo ∷ URI → [ByteString]
+splitPathInfo uri
+    = let reqPathStr = uriPath uri
+          reqPath    = [unEscapeString x | x ← splitBy (≡ '/') reqPathStr, (¬) (null x)]
+      in
+        map Strict.pack reqPath
+
+-- |>>> trim "  ab c d "
+-- "ab c d"
+trim ∷ String → String
+trim = reverse ∘ f ∘ reverse ∘ f
+    where
+      f = dropWhile isSpace
+
+-- |Convert a 'ByteString' to an 'Exp' representing it as a literal.
+liftByteString ∷ ByteString → Q Exp
+liftByteString bs
+    = [| Strict.pack $(litE $ stringL $ Strict.unpack bs) |]
+
+-- |Convert a 'Lazy.ByteString' to an 'Exp' representing it as a
+-- literal.
+liftLazyByteString ∷ Lazy.ByteString → Q Exp
+liftLazyByteString = Lazy.foldrChunks f [| Lazy.Empty |]
+    where
+      f ∷ ByteString → Q Exp → Q Exp
+      f bs e = [| Lazy.Chunk $(liftByteString bs) $e |]
+
+-- |Convert an 'Ascii' to an 'Exp' representing it as a literal.
+liftAscii ∷ Ascii → Q Exp
+liftAscii a = [| A.unsafeFromByteString
+                 $ unsafePerformIO
+                 $ Strict.unsafePackAddressLen $len $ptr
+               |]
+    where
+      bs ∷ Strict.ByteString
+      bs = A.toByteString a
+
+      len, ptr ∷ Q Exp
+      len = lift $ Strict.length bs
+      ptr = litE $ stringPrimL $ Strict.unpack bs
+
+-- |Convert a 'CIAscii' to an 'Exp' representing it as a literal.
+liftCIAscii ∷ CIAscii → Q Exp
+liftCIAscii a = [| A.toCIAscii $(liftAscii $ A.fromCIAscii a) |]
+
+-- |Convert a 'Text' to an 'Exp' representing it as a literal.
+liftText ∷ Text → Q Exp
+liftText t = [| T.pack $(litE $ stringL $ T.unpack t) |]
+
+-- |Convert an arbitrary 'Map' to an 'Exp' representing it as a
+-- literal, using a given key lifter and a value lifter.
+liftMap ∷ Eq k ⇒ (k → Q Exp) → (v → Q Exp) → Map k v → Q Exp
+liftMap liftK liftV m
+    | M.null m  = [| M.empty |]
+    | otherwise = [| M.fromDistinctAscList $(liftPairs (M.toAscList m)) |]
+    where
+      liftPairs       = listE ∘ map liftPair
+      liftPair (k, v) = tupE [liftK k, liftV v]
+
+-- |Convert an 'UTCTime' to an 'Exp' representing it as a literal.
+liftUTCTime ∷ UTCTime → Q Exp
+liftUTCTime (UTCTime {..})
+    = [| UTCTime {
+           utctDay     = $(liftDay utctDay)
+         , utctDayTime = $(liftDiffTime utctDayTime)
+         }
+       |]
+
+liftDay ∷ Day → Q Exp
+liftDay (ModifiedJulianDay {..})
+    = [| ModifiedJulianDay {
+           toModifiedJulianDay = $(lift toModifiedJulianDay)
+         }
+       |]
+
+liftDiffTime ∷ DiffTime → Q Exp
+liftDiffTime dt = [| fromRational ($n % $d) ∷ DiffTime |]
     where
-      go i | i ≥ 0 ∧ i < 10   = B.fromByteString "00" ⊕ BT.digit    i
-           | i ≥ 0 ∧ i < 100  = B.fromByteString "0"  ⊕ BT.integral i
-           | i ≥ 0 ∧ i < 1000 =                         BT.integral i
-           | otherwise        = error ("show3: the integer i must satisfy 0 <= i < 1000: " ⧺ show i)
+      n, d ∷ Q Exp
+      n = lift $ numerator   $ toRational dt
+      d = lift $ denominator $ toRational dt