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UTF8Z.hs
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UTF8Z.hs
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{-# OPTIONS_GHC -cpp #-}
----------------------------------------------------------------------------------------------------
---- Èìåíà ôàéëîâ, õðàíÿþùèåñÿ â UTF8+\0 ïðåäñòàâëåíèè. ----
---- Èìåíà ñîðòèðóþòñÿ/ñðàâíèâàþòñÿ ñ ó÷¸òîì èëè áåç ó÷¸òà ðåãèñòðà â çàâèñèìîñòè îò òîãî, ----
---- îòêîìïèëèðîâàíà ëè ïðîãðàììà ïîä Windows èëè Unix ----
----------------------------------------------------------------------------------------------------
-- |
-- Module : UTF8Z
-- Copyright : (c) Bulat Ziganshin <Bulat.Ziganshin@gmail.com>
-- License : Public domain
--
-- Maintainer : Bulat.Ziganshin@gmail.com
-- Stability : experimental
-- Portability : GHC
--
-----------------------------------------------------------------------------
module UTF8Z where
import Data.Bits
import Data.Char
import Data.Word
import GHC.Exts
import GHC.IOBase
import GHC.Word
import Foreign.C.Types
data PackedString = PS ByteArray#
instance Eq PackedString where
a==b = a `comparePS` b == EQ
{-# INLINE (==) #-}
instance Ord PackedString where
compare = comparePS
{-# INLINE compare #-}
packString :: String -> PackedString
packString = inlinePerformIO.packStr
packStr :: String -> IO PackedString
packStr str = IO $ \s ->
case newByteArray# (utfCount str +# 1#) s of { (# s, arr #) ->
case go arr 0# str s of { s ->
case unsafeFreezeByteArray# arr s of { (# s, arr #) ->
(# s, PS arr #) } } }
where
go p i [] s# = writeWord8Array# p i (u 0) s#
go p i (x:xs) s#
| ord x<=0x07f = case writeWord8Array# p i (u (ord x)) s# of { s# ->
go p (i +# 1#) xs s# }
| ord x<=0x07ff = case writeWord8Array# p i (u (0xC0 .|. ((ord x `shiftR` 6) .&. 0x1F))) s# of { s# ->
case writeWord8Array# p (i +# 1#) (u (0x80 .|. (ord x .&. 0x3F))) s# of { s# ->
go p (i +# 2#) xs s# } }
| ord x<=0xffff = case writeWord8Array# p i (u (0xE0 .|. ((ord x `shiftR` 12) .&. 0x0F))) s# of { s# ->
case writeWord8Array# p (i +# 1#) (u (0x80 .|. ((ord x `shiftR` 6) .&. 0x3F))) s# of { s# ->
case writeWord8Array# p (i +# 2#) (u (0x80 .|. (ord x .&. 0x3F))) s# of { s# ->
go p (i +# 3#) xs s# } } }
| otherwise = case writeWord8Array# p i (u (0xF0 .|. (ord x `shiftR` 18))) s# of { s# ->
case writeWord8Array# p (i +# 1#) (u (0x80 .|. ((ord x `shiftR` 12) .&. 0x3F))) s# of { s# ->
case writeWord8Array# p (i +# 2#) (u (0x80 .|. ((ord x `shiftR` 6) .&. 0x3F))) s# of { s# ->
case writeWord8Array# p (i +# 3#) (u (0x80 .|. (ord x .&. 0x3F))) s# of { s# ->
go p (i +# 4#) xs s# } } } }
u n = case fromIntegral n of { (W8# w) -> w }
unpackPS :: PackedString -> String
unpackPS (PS ba) = unpackFoldrUtf8# ba f [] where
f ch r = C# ch : r
{-# INLINE comparePS #-}
-- Âûáåðåì ìåæäó strcmp è strcasecmp â çàâèñìîñòè îò ÎÑ
#if defined(FREEARC_WIN)
comparePS (PS x) (PS y) = case inlinePerformIO$ strcasecmp (unsafeCoerce# x) (unsafeCoerce# y) of
#else
comparePS (PS x) (PS y) = case inlinePerformIO$ strcmp (unsafeCoerce# x) (unsafeCoerce# y) of
#endif
x | x<0 -> LT
| x>0 -> GT
| otherwise -> EQ
-- C functions that compare strings either case-sensitive or case-ignoring
foreign import ccall unsafe
strcmp :: ByteArray# -> ByteArray# -> IO CInt
foreign import ccall unsafe
strcasecmp :: ByteArray# -> ByteArray# -> IO CInt
-- -----------------------------------------------------------------------------
-- Local utility functions
{-# INLINE utfCount #-}
utfCount :: String -> Int#
utfCount cs = uc 0# cs where
uc n [] = n
uc n (x:xs)
| ord x <= 0x7f = uc (n +# 1#) xs
| ord x <= 0x7ff = uc (n +# 2#) xs
| ord x <= 0xffff = uc (n +# 3#) xs
| ord x <= 0x1fffff = uc (n +# 4#) xs
| ord x <= 0x3ffffff = uc (n +# 5#) xs
| ord x <= 0x7fffffff = uc (n +# 6#) xs
| otherwise = error "invalid string"
-- | Convert Unicode characters to UTF-8.
utfList :: String -> [Word8]
utfList [] = []
utfList (x:xs)
| ord x<=0x007f = fromIntegral (ord x) : utfList xs
| ord x<=0x07ff = fromIntegral (0xC0 .|. ((ord x `shiftR` 6) .&. 0x1F)):
fromIntegral (0x80 .|. (ord x .&. 0x3F)):
utfList xs
| ord x<=0xffff = fromIntegral (0xE0 .|. ((ord x `shiftR` 12) .&. 0x0F)):
fromIntegral (0x80 .|. ((ord x `shiftR` 6) .&. 0x3F)):
fromIntegral (0x80 .|. (ord x .&. 0x3F)):
utfList xs
| otherwise = fromIntegral (0xF0 .|. (ord x `shiftR` 18)) :
fromIntegral (0x80 .|. ((ord x `shiftR` 12) .&. 0x3F)) :
fromIntegral (0x80 .|. ((ord x `shiftR` 6) .&. 0x3F)) :
fromIntegral (0x80 .|. (ord x .&. 0x3F)) :
utfList xs
{-# INLINE unpackFoldrUtf8# #-}
unpackFoldrUtf8# :: ByteArray# -> (Char# -> b -> b) -> b -> b
unpackFoldrUtf8# addr f e = unpack 0# where
unpack nh
| ch `eqChar#` '\x00'# = e
| ch `leChar#` '\x7F'# = ch `f` unpack (nh +# 1#)
| ch `leChar#` '\xDF'# =
(chr# (((ord# ch -# 0xC0#) `uncheckedIShiftL#` 6#) +#
(ord# (indexCharArray# addr (nh +# 1#)) -# 0x80#))) `f`
unpack (nh +# 2#)
| ch `leChar#` '\xEF'# =
(chr# (((ord# ch -# 0xE0#) `uncheckedIShiftL#` 12#) +#
((ord# (indexCharArray# addr (nh +# 1#)) -# 0x80#) `uncheckedIShiftL#` 6#) +#
(ord# (indexCharArray# addr (nh +# 2#)) -# 0x80#))) `f`
unpack (nh +# 3#)
| otherwise =
(chr# (((ord# ch -# 0xF0#) `uncheckedIShiftL#` 18#) +#
((ord# (indexCharArray# addr (nh +# 1#)) -# 0x80#) `uncheckedIShiftL#` 12#) +#
((ord# (indexCharArray# addr (nh +# 2#)) -# 0x80#) `uncheckedIShiftL#` 6#) +#
(ord# (indexCharArray# addr (nh +# 3#)) -# 0x80#))) `f`
unpack (nh +# 4#)
where
ch = indexCharArray# addr nh
{-# INLINE unpackFoldlUtf8# #-}
unpackFoldlUtf8# :: (a -> Char# -> a) -> a -> ByteArray# -> Int# -> a
unpackFoldlUtf8# f e addr count = unpack 0# e where
unpack nh e
| nh ==# count = e
| ch `leChar#` '\x7F'# = let n = (f e ch) in n `seq` unpack (nh +# 1#) n
| ch `leChar#` '\xDF'# =
let n = f e (chr# (((ord# ch -# 0xC0#) `uncheckedIShiftL#` 6#) +#
(ord# (indexCharArray# addr (nh +# 1#)) -# 0x80#))) in n `seq` unpack (nh +# 2#) n
| ch `leChar#` '\xEF'# =
let n = f e (chr# (((ord# ch -# 0xE0#) `uncheckedIShiftL#` 12#) +#
((ord# (indexCharArray# addr (nh +# 1#)) -# 0x80#) `uncheckedIShiftL#` 6#) +#
(ord# (indexCharArray# addr (nh +# 2#)) -# 0x80#))) in n `seq` unpack (nh +# 3#) n
| otherwise =
let n = f e (chr# (((ord# ch -# 0xF0#) `uncheckedIShiftL#` 18#) +#
((ord# (indexCharArray# addr (nh +# 1#)) -# 0x80#) `uncheckedIShiftL#` 12#) +#
((ord# (indexCharArray# addr (nh +# 2#)) -# 0x80#) `uncheckedIShiftL#` 6#) +#
(ord# (indexCharArray# addr (nh +# 3#)) -# 0x80#))) in n `seq` unpack (nh +# 4#) n
where
ch = indexCharArray# addr nh
-- Just like unsafePerformIO, but we inline it.
{-# INLINE inlinePerformIO #-}
inlinePerformIO :: IO a -> a
inlinePerformIO (IO m) = case m realWorld# of (# _, r #) -> r