The attoparsec branch. It doesn't even compile for now.

[Lucu.git] / Network / HTTP / Lucu / Parser / Http.hs

diff --git a/Network/HTTP/Lucu/Parser/Http.hs b/Network/HTTP/Lucu/Parser/Http.hs
index c1b30fc208c1d6bbbb787911f642c52de7ef3288..65ba8b27ccb1ff66f52d6bd83a6b2af86f3980be 100644 (file)
--- a/Network/HTTP/Lucu/Parser/Http.hs
+++ b/Network/HTTP/Lucu/Parser/Http.hs
@@ -1,66 +1,164 @@
+{-# LANGUAGE
+    BangPatterns
+  , OverloadedStrings
+  , UnicodeSyntax
+  #-}
+-- |This is an auxiliary parser utilities for parsing things related
+-- on HTTP protocol.
+--
+-- In general you don't have to use this module directly.
 module Network.HTTP.Lucu.Parser.Http
-    ( isCtl       -- Char -> Bool
-    , isSeparator -- Char -> Bool
-    , isChar      -- Char -> Bool
-    , token       -- Parser String
-    , lws         -- Parser String
-    , text        -- Parser Char
-    , separator   -- Parser Char
-    , quotedStr   -- Parser String
-    )
-    where
-
-import qualified Data.ByteString.Lazy.Char8 as B
-import           Data.ByteString.Lazy.Char8 (ByteString)
-import           Data.List
-import           Network.HTTP.Lucu.Parser
-
-isCtl :: Char -> Bool
-isCtl c
-    | c <  '\x1f' = True
-    | c == '\x7f' = True
-    | otherwise  = False
-
-
-isSeparator :: Char -> Bool
-isSeparator c = elem c "()<>@,;:\\\"/[]?={} \t"
-
-
-isChar :: Char -> Bool
-isChar c
-    | c <= '\x7f' = True
-    | otherwise   = False
+    ( isCtl
+    , isText
+    , isSeparator
+    , isChar
+    , isToken
+    , isSPHT
 
+    , listOf
 
-token :: Parser String
-token = many1 $ satisfy (\ c -> not (isCtl c || isSeparator c))
+    , crlf
+    , sp
+    , lws
 
+    , token
+    , separators
+    , quotedStr
+    , qvalue
 
-lws :: Parser String
-lws = do s  <- option "" crlf
-         xs <- many1 (sp <|> ht)
-         return (s ++ xs)
-
-
-text :: Parser Char
-text = satisfy (\ c -> not (isCtl c))
-
-
-separator :: Parser Char
-separator = satisfy isSeparator
+    , atMost
+    )
+    where
+import Control.Applicative
+import Control.Applicative.Unicode
+import Control.Monad.Unicode
+import Data.Ascii (Ascii)
+import qualified Data.Ascii as A
+import Data.Attoparsec.Char8 as P
+import qualified Data.Attoparsec.FastSet as FS
+import qualified Data.ByteString.Char8 as BS
+import Prelude.Unicode
+
+-- |@'isCtl' c@ is 'Prelude.False' iff @0x20 <= c < 0x7F@.
+isCtl ∷ Char → Bool
+{-# INLINE isCtl #-}
+isCtl c
+    | c ≤ '\x1f' = True
+    | c > '\x7f' = True
+    | otherwise  = False
 
+-- |@'isText'@ is equivalent to @'not' '.' 'isCtl'@
+isText ∷ Char → Bool
+{-# INLINE isText #-}
+isText = (¬) ∘ isCtl
 
-quotedStr :: Parser String
-quotedStr = do char '"'
-               xs <- many (qdtext <|> quotedPair)
-               char '"'
-               return $ foldr (++) "" (["\""] ++ xs ++ ["\""])
+-- |@'isSeparator' c@ is 'Prelude.True' iff c is one of HTTP
+-- separators.
+isSeparator ∷ Char → Bool
+{-# INLINE isSeparator #-}
+isSeparator = flip FS.memberChar set
+    where
+      {-# NOINLINE set #-}
+      set = FS.charClass "()<>@,;:\\\"/[]?={}\x20\x09"
+
+-- |@'isChar' c@ is 'Prelude.True' iff @c <= 0x7f@.
+isChar ∷ Char → Bool
+{-# INLINE isChar #-}
+isChar = (≤ '\x7F')
+
+-- |@'isToken' c@ is equivalent to @not ('isCtl' c || 'isSeparator'
+-- c)@
+isToken ∷ Char → Bool
+{-# INLINE isToken #-}
+isToken !c
+    = (¬) (isCtl c ∨ isSeparator c)
+
+-- |@'listOf' p@ is similar to @'sepBy' p ('char' \',\')@ but it
+-- allows any occurrences of 'lws' before and after each tokens.
+listOf ∷ Parser a → Parser [a]
+{-# INLINEABLE listOf #-}
+listOf p
+    = try $
+      do skipMany lws
+         sepBy p $ do skipMany lws
+                      _ <- char ','
+                      skipMany lws
+
+-- |'token' is similar to @'takeWhile1' 'isToken'@
+token ∷ Parser Ascii
+{-# INLINE token #-}
+token = A.unsafeFromByteString <$> takeWhile1 isToken
+
+-- |The CRLF: 0x0D 0x0A.
+crlf ∷ Parser ()
+{-# INLINE crlf #-}
+crlf = string "\x0D\x0A" ≫ return ()
+
+-- |The SP: 0x20.
+sp ∷ Parser ()
+{-# INLINE sp #-}
+sp = char '\x20' ≫ return ()
+
+-- |HTTP LWS: crlf? (sp | ht)+
+lws ∷ Parser ()
+{-# INLINEABLE lws #-}
+lws = try $
+      do option () crlf
+         _ ← satisfy isSPHT
+         skipWhile isSPHT
+
+-- |Returns 'True' for SP and HT.
+isSPHT ∷ Char → Bool
+{-# INLINE isSPHT #-}
+isSPHT '\x20' = True
+isSPHT '\x09' = True
+isSPHT _      = False
+
+-- |@'separators'@ is similar to @'takeWhile1' 'isSeparator'@.
+separators ∷ Parser Ascii
+{-# INLINE separators #-}
+separators = A.unsafeFromByteString <$> takeWhile1 isSeparator
+
+-- |'quotedStr' accepts a string surrounded by double quotation
+-- marks. Quotes can be escaped by backslashes.
+quotedStr ∷ Parser Ascii
+{-# INLINEABLE quotedStr #-}
+quotedStr = try $
+            do _  ← char '"'
+               xs ← P.many (qdtext <|> quotedPair)
+               _  ← char '"'
+               return $ A.unsafeFromByteString $ BS.pack xs
     where
-      qdtext = char '"' >> fail ""
-               <|>
-               do c <- text
-                  return [c]
-
-      quotedPair = do q <- char '\\'
-                      c <- satisfy isChar
-                      return [q, c]
+      qdtext ∷ Parser Char
+      {-# INLINE qdtext #-}
+      qdtext = satisfy (\c → c ≢ '"' ∧ (¬) (isCtl c))
+
+      quotedPair ∷ Parser Char
+      {-# INLINE quotedPair #-}
+      quotedPair = char '\\' ≫ satisfy isChar
+
+-- |'qvalue' accepts a so-called qvalue.
+qvalue ∷ Parser Double
+{-# INLINEABLE qvalue #-}
+qvalue = do x  ← char '0'
+            xs ← option "" $
+                 do y  ← char '.'
+                    ys ← atMost 3 digit
+                    return (y:ys)
+            return $ read (x:xs)
+         <|>
+         do x  ← char '1'
+            xs ← option "" $
+                 do y  ← char '.'
+                    ys ← atMost 3 (char '0')
+                    return (y:ys)
+            return $ read (x:xs)
+
+-- |@'atMost' n v@ is like @'P.many' v@ but applies the given action
+-- at most @n@ times.
+atMost ∷ Alternative f ⇒ Int → f a → f [a]
+{-# INLINE atMost #-}
+atMost 0 _ = pure []
+atMost n v = ( (:) <$> v ⊛ atMost (n-1) v )
+             <|>
+             pure []