{-# 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
+ , splitPathInfo
+ , trim
+ , liftByteString
+ , liftLazyByteString
+ , liftAscii
+ , liftCIAscii
+ , liftText
+ , liftMap
+ , liftUTCTime
)
where
import Control.Monad
-import Data.Ascii (Ascii, AsciiBuilder)
+import Data.Ascii (Ascii, CIAscii, AsciiBuilder)
import qualified Data.Ascii as A
-import qualified Data.ByteString.Char8 as BS
+import Data.ByteString (ByteString)
+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 ∷ String → [(String, String)]
+-- |>>> parseWWWFormURLEncoded "aaa=bbb&ccc=ddd"
+-- [("aaa", "bbb"), ("ccc", "ddd")]
+parseWWWFormURLEncoded ∷ Ascii → [(ByteString, ByteString)]
parseWWWFormURLEncoded src
- | null src = []
- | otherwise = do pairStr ← splitBy (\ c → c ≡ ';' ∨ c ≡ '&') src
+ -- THINKME: We could gain some performance by using attoparsec
+ -- here.
+ | src ≡ "" = []
+ | otherwise = do pairStr ← splitBy (\ c → c ≡ ';' ∨ c ≡ '&') (A.toString src)
let (key, value) = break (≡ '=') pairStr
return ( unescape key
, unescape $ case value of
val → val
)
where
- unescape ∷ String → String
- unescape = unEscapeString ∘ map plusToSpace
+ unescape ∷ String → ByteString
+ unescape = Strict.pack ∘ unEscapeString ∘ map plusToSpace
plusToSpace ∷ Char → Char
plusToSpace '+' = ' '
plusToSpace c = c
+
+-- |>>> 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
+ n, d ∷ Q Exp
+ n = lift $ numerator $ toRational dt
+ d = lift $ denominator $ toRational dt
projects / Lucu.git / blobdiff