X-Git-Url: http://git.cielonegro.org/gitweb.cgi?p=Lucu.git;a=blobdiff_plain;f=Network%2FHTTP%2FLucu%2FParser.hs;h=cc12cd73733b636ce3270e8518d137ade2eb3266;hp=80d7707f441ace9da97882f19d1e022d45a0bded;hb=7b3c7c2c5be4fc05ee03008aa0af56fab798e1bb;hpb=47206637d664f163316dc9bb20983440ae4b138f

diff --git a/Network/HTTP/Lucu/Parser.hs b/Network/HTTP/Lucu/Parser.hs
index 80d7707..cc12cd7 100644
--- a/Network/HTTP/Lucu/Parser.hs
+++ b/Network/HTTP/Lucu/Parser.hs
@@ -49,18 +49,24 @@ module Network.HTTP.Lucu.Parser
     )
     where
 
-import           Control.Monad.State
+import           Control.Monad.State.Strict
 import qualified Data.ByteString.Lazy.Char8 as B
 import           Data.ByteString.Lazy.Char8 (ByteString)
 
+
 -- |@Parser a@ is obviously a parser which parses and returns @a@.
 newtype Parser a = Parser {
       runParser :: State ParserState (ParserResult a)
     }
 
-type ParserState = (ByteString, IsEOFFatal)
 
-type IsEOFFatal = Bool
+data ParserState
+    = PST {
+        pstInput      :: ByteString
+      , pstIsEOFFatal :: !Bool
+      }
+    deriving (Eq, Show)
+
 
 data ParserResult a = Success !a
                     | IllegalInput -- 受理出來ない入力があった
@@ -70,14 +76,13 @@ data ParserResult a = Success !a
 
 --  (>>=) :: Parser a -> (a -> Parser b) -> Parser b
 instance Monad Parser where
-    p >>= f = Parser $! do saved@(_, isEOFFatal) <- get -- 失敗した時の爲に状態を保存
+    p >>= f = Parser $! do saved <- get -- 失敗した時の爲に状態を保存
                            result <- runParser p
                            case result of
-                             Success a    -> a `seq` runParser (f a)
+                             Success a    -> runParser (f a)
                              IllegalInput -> do put saved -- 状態を復歸
                                                 return IllegalInput
-                             ReachedEOF   -> do unless isEOFFatal
-                                                           $ put saved -- 状態を復歸
+                             ReachedEOF   -> do put saved -- 状態を復歸
                                                 return ReachedEOF
     return x = x `seq` Parser $! return $! Success x
     fail _   = Parser $! return $! IllegalInput
@@ -91,9 +96,9 @@ failP = fail undefined
 parse :: Parser a -> ByteString -> (ParserResult a, ByteString)
 parse p input -- input は lazy である必要有り。
     = p `seq`
-      let (result, (input', _)) = runState (runParser p) (input, True)
+      let (result, state') = runState (runParser p) (PST input True)
       in
-        result `seq` (result, input') -- input' も lazy である必要有り。
+        result `seq` (result, pstInput state') -- pstInput state' も lazy である必要有り。
 
 -- |@'parseStr' p str@ packs @str@ and parses it.
 parseStr :: Parser a -> String -> (ParserResult a, ByteString)
@@ -104,32 +109,32 @@ parseStr p input
 
 anyChar :: Parser Char
 anyChar = Parser $!
-          do (input, isEOFFatal) <- get
+          do state@(PST input _) <- get
              if B.null input then
                  return ReachedEOF
                else
-                 do put (B.tail input, isEOFFatal)
+                 do put $! state { pstInput = B.tail input }
                     return (Success $! B.head input)
 
 
 eof :: Parser ()
 eof = Parser $!
-      do (input, _) <- get
+      do PST input _ <- get
          if B.null input then
-             return $ Success ()
+             return $! Success ()
            else
              return IllegalInput
 
 -- |@'allowEOF' p@ makes @p@ treat reaching EOF a normal failure.
 allowEOF :: Parser a -> Parser a
 allowEOF f = f `seq`
-             Parser $! do (input, isEOFFatal) <- get
-                          put (input, False)
+             Parser $! do saved@(PST _ isEOFFatal) <- get
+                          put $! saved { pstIsEOFFatal = False }
 
                           result <- runParser f
                          
-                          (input', _) <- get
-                          put (input', isEOFFatal)
+                          state <- get
+                          put $! state { pstIsEOFFatal = isEOFFatal }
 
                           return result
 
@@ -160,13 +165,13 @@ infixr 0 <|>
 (<|>) :: Parser a -> Parser a -> Parser a
 f <|> g
     = f `seq` g `seq`
-      Parser $! do saved@(_, isEOFFatal) <- get -- 状態を保存
+      Parser $! do saved <- get -- 状態を保存
                    result <- runParser f
                    case result of
-                     Success a    -> return $ Success a
+                     Success a    -> return $! Success a
                      IllegalInput -> do put saved -- 状態を復歸
                                         runParser g
-                     ReachedEOF   -> if isEOFFatal then
+                     ReachedEOF   -> if pstIsEOFFatal saved then
                                          return ReachedEOF
                                      else
                                          do put saved