% (c) The University of Glasgow, 1997-2006
%
\begin{code}
-{-# OPTIONS -w #-}
--- The above warning supression flag is a temporary kludge.
--- While working on this module you are encouraged to remove it and fix
--- any warnings in the module. See
--- http://hackage.haskell.org/trac/ghc/wiki/Commentary/CodingStyle#Warnings
--- for details
-
{-
FastString: A compact, hash-consed, representation of character strings.
Comparison is O(1), and you can get a Unique from them.
import Encoding
import FastTypes
import FastFunctions
+import Panic
import Foreign
import Foreign.C
import GHC.Exts
+import System.IO
import System.IO.Unsafe ( unsafePerformIO )
-import Control.Monad.ST ( stToIO )
import Data.IORef ( IORef, newIORef, readIORef, writeIORef )
-import System.IO ( hPutBuf )
import Data.Maybe ( isJust )
+#if !defined(__GLASGOW_HASKELL__)
import Data.Char ( ord )
+#endif
-import GHC.ST
import GHC.IOBase ( IO(..) )
import GHC.Ptr ( Ptr(..) )
mkFastStringBytes :: Ptr Word8 -> Int -> FastString
mkFastStringBytes ptr len = unsafePerformIO $ do
- ft@(FastStringTable uid tbl#) <- readIORef string_table
+ ft@(FastStringTable uid _) <- readIORef string_table
let
h = hashStr ptr len
add_it ls = do
mkZFastStringBytes :: Ptr Word8 -> Int -> FastString
mkZFastStringBytes ptr len = unsafePerformIO $ do
- ft@(FastStringTable uid tbl#) <- readIORef string_table
+ ft@(FastStringTable uid _) <- readIORef string_table
let
h = hashStr ptr len
add_it ls = do
-- the bytes if the string is new to the table.
mkFastStringForeignPtr :: Ptr Word8 -> ForeignPtr Word8 -> Int -> IO FastString
mkFastStringForeignPtr ptr fp len = do
- ft@(FastStringTable uid tbl#) <- readIORef string_table
+ ft@(FastStringTable uid _) <- readIORef string_table
-- _trace ("hashed: "++show (I# h)) $
let
h = hashStr ptr len
mkZFastStringForeignPtr :: Ptr Word8 -> ForeignPtr Word8 -> Int -> IO FastString
mkZFastStringForeignPtr ptr fp len = do
- ft@(FastStringTable uid tbl#) <- readIORef string_table
+ ft@(FastStringTable uid _) <- readIORef string_table
-- _trace ("hashed: "++show (I# h)) $
let
h = hashStr ptr len
pokeCAString (castPtr ptr) str
mkZFastStringForeignPtr ptr buf l
+bucket_match :: [FastString] -> Int -> Ptr Word8 -> IO (Maybe FastString)
bucket_match [] _ _ = return Nothing
bucket_match (v@(FastString _ l _ buf _):ls) len ptr
| len == l = do
| otherwise =
bucket_match ls len ptr
+mkNewFastString :: Int -> Ptr Word8 -> ForeignPtr Word8 -> Int
+ -> IO FastString
mkNewFastString uid ptr fp len = do
ref <- newIORef Nothing
n_chars <- countUTF8Chars ptr len
return (FastString uid len n_chars fp (UTF8Encoded ref))
-mkNewZFastString uid ptr fp len = do
+mkNewZFastString :: Int -> Ptr Word8 -> ForeignPtr Word8 -> Int
+ -> IO FastString
+mkNewZFastString uid _ fp len = do
return (FastString uid len len fp ZEncoded)
-
+copyNewFastString :: Int -> Ptr Word8 -> Int -> IO FastString
copyNewFastString uid ptr len = do
fp <- copyBytesToForeignPtr ptr len
ref <- newIORef Nothing
n_chars <- countUTF8Chars ptr len
return (FastString uid len n_chars fp (UTF8Encoded ref))
+copyNewZFastString :: Int -> Ptr Word8 -> Int -> IO FastString
copyNewZFastString uid ptr len = do
fp <- copyBytesToForeignPtr ptr len
return (FastString uid len len fp ZEncoded)
-
+copyBytesToForeignPtr :: Ptr Word8 -> Int -> IO (ForeignPtr Word8)
copyBytesToForeignPtr ptr len = do
fp <- mallocForeignPtrBytes len
withForeignPtr fp $ \ptr' -> copyBytes ptr' ptr len
-- | Returns 'True' if this 'FastString' is not Z-encoded but already has
-- a Z-encoding cached (used in producing stats).
hasZEncoding :: FastString -> Bool
-hasZEncoding fs@(FastString uid n_bytes _ fp enc) =
+hasZEncoding (FastString _ _ _ _ enc) =
case enc of
ZEncoded -> False
UTF8Encoded ref ->
UTF8Encoded _ -> utf8DecodeString ptr n_bytes
bytesFS :: FastString -> [Word8]
-bytesFS (FastString _ n_bytes _ buf enc) =
+bytesFS (FastString _ n_bytes _ buf _) =
inlinePerformIO $ withForeignPtr buf $ \ptr ->
peekArray n_bytes ptr
-- memoized.
--
zEncodeFS :: FastString -> FastString
-zEncodeFS fs@(FastString uid n_bytes _ fp enc) =
+zEncodeFS fs@(FastString _ _ _ _ enc) =
case enc of
ZEncoded -> fs
UTF8Encoded ref ->
concatFS ls = mkFastString (Prelude.concat (map unpackFS ls)) -- ToDo: do better
headFS :: FastString -> Char
-headFS (FastString _ n_bytes _ buf enc) =
+headFS (FastString _ 0 _ _ _) = panic "headFS: Empty FastString"
+headFS (FastString _ _ _ buf enc) =
inlinePerformIO $ withForeignPtr buf $ \ptr -> do
case enc of
ZEncoded -> do
return (fst (utf8DecodeChar ptr))
tailFS :: FastString -> FastString
+tailFS (FastString _ 0 _ _ _) = panic "tailFS: Empty FastString"
tailFS (FastString _ n_bytes _ buf enc) =
inlinePerformIO $ withForeignPtr buf $ \ptr -> do
case enc of
uniqueOfFS :: FastString -> FastInt
uniqueOfFS (FastString u _ _ _ _) = iUnbox u
+nilFS :: FastString
nilFS = mkFastString ""
-- -----------------------------------------------------------------------------
-- |Outputs a 'FastString' with /no decoding at all/, that is, you
-- get the actual bytes in the 'FastString' written to the 'Handle'.
+hPutFS :: Handle -> FastString -> IO ()
hPutFS handle (FastString _ len _ fp _)
| len == 0 = return ()
| otherwise = do withForeignPtr fp $ \ptr -> hPutBuf handle ptr len
#if defined(__GLASGOW_HASKELL__)
mkLitString# :: Addr# -> LitString
mkLitString# a# = Ptr a#
-#endif
-
+#else
--can/should we use FastTypes here?
--Is this likely to be memory-preserving if only used on constant strings?
--should we inline it? If lucky, that would make a CAF that wouldn't
loop 0 s
return p
)
+#endif
unpackLitString :: LitString -> String
unpackLitString p_ = case pUnbox p_ of
pokeCAString :: Ptr CChar -> String -> IO ()
pokeCAString ptr str =
let
- go [] n = return ()
+ go [] _ = return ()
go (c:cs) n = do pokeElemOff ptr n (castCharToCChar c); go cs (n+1)
in
go str 0
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