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|
{-# LANGUAGE Trustworthy #-}
{-# LANGUAGE NoImplicitPrelude
, BangPatterns
, NondecreasingIndentation
#-}
{-# OPTIONS_GHC -funbox-strict-fields #-}
-----------------------------------------------------------------------------
-- |
-- Module : GHC.IO.Encoding.Latin1
-- Copyright : (c) The University of Glasgow, 2009
-- License : see libraries/base/LICENSE
--
-- Maintainer : libraries@haskell.org
-- Stability : internal
-- Portability : non-portable
--
-- Single-byte encodings that map directly to Unicode code points.
--
-- Portions Copyright : (c) Tom Harper 2008-2009,
-- (c) Bryan O'Sullivan 2009,
-- (c) Duncan Coutts 2009
--
-----------------------------------------------------------------------------
module GHC.IO.Encoding.Latin1 (
latin1, mkLatin1,
latin1_checked, mkLatin1_checked,
ascii, mkAscii,
latin1_decode,
ascii_decode,
latin1_encode,
latin1_checked_encode,
ascii_encode,
) where
import GHC.Base
import GHC.Real
import GHC.Num
-- import GHC.IO
import GHC.IO.Buffer
import GHC.IO.Encoding.Failure
import GHC.IO.Encoding.Types
-- -----------------------------------------------------------------------------
-- Latin1
latin1 :: TextEncoding
latin1 = mkLatin1 ErrorOnCodingFailure
-- | @since 4.4.0.0
mkLatin1 :: CodingFailureMode -> TextEncoding
mkLatin1 cfm = TextEncoding { textEncodingName = "ISO8859-1",
mkTextDecoder = latin1_DF cfm,
mkTextEncoder = latin1_EF cfm }
latin1_DF :: CodingFailureMode -> IO (TextDecoder ())
latin1_DF cfm =
return (BufferCodec {
encode = latin1_decode,
recover = recoverDecode cfm,
close = return (),
getState = return (),
setState = const $ return ()
})
latin1_EF :: CodingFailureMode -> IO (TextEncoder ())
latin1_EF cfm =
return (BufferCodec {
encode = latin1_encode,
recover = recoverEncode cfm,
close = return (),
getState = return (),
setState = const $ return ()
})
latin1_checked :: TextEncoding
latin1_checked = mkLatin1_checked ErrorOnCodingFailure
-- | @since 4.4.0.0
mkLatin1_checked :: CodingFailureMode -> TextEncoding
mkLatin1_checked cfm = TextEncoding { textEncodingName = "ISO8859-1(checked)",
mkTextDecoder = latin1_DF cfm,
mkTextEncoder = latin1_checked_EF cfm }
latin1_checked_EF :: CodingFailureMode -> IO (TextEncoder ())
latin1_checked_EF cfm =
return (BufferCodec {
encode = latin1_checked_encode,
recover = recoverEncode cfm,
close = return (),
getState = return (),
setState = const $ return ()
})
-- -----------------------------------------------------------------------------
-- ASCII
-- | @since 4.9.0.0
ascii :: TextEncoding
ascii = mkAscii ErrorOnCodingFailure
-- | @since 4.9.0.0
mkAscii :: CodingFailureMode -> TextEncoding
mkAscii cfm = TextEncoding { textEncodingName = "ASCII",
mkTextDecoder = ascii_DF cfm,
mkTextEncoder = ascii_EF cfm }
ascii_DF :: CodingFailureMode -> IO (TextDecoder ())
ascii_DF cfm =
return (BufferCodec {
encode = ascii_decode,
recover = recoverDecode cfm,
close = return (),
getState = return (),
setState = const $ return ()
})
ascii_EF :: CodingFailureMode -> IO (TextEncoder ())
ascii_EF cfm =
return (BufferCodec {
encode = ascii_encode,
recover = recoverEncode cfm,
close = return (),
getState = return (),
setState = const $ return ()
})
-- -----------------------------------------------------------------------------
-- The actual decoders and encoders
-- TODO: Eliminate code duplication between the checked and unchecked
-- versions of the decoder or encoder (but don't change the Core!)
latin1_decode :: DecodeBuffer
latin1_decode
input@Buffer{ bufRaw=iraw, bufL=ir0, bufR=iw, bufSize=_ }
output@Buffer{ bufRaw=oraw, bufL=_, bufR=ow0, bufSize=os }
= let
loop !ir !ow
| ow >= os = done OutputUnderflow ir ow
| ir >= iw = done InputUnderflow ir ow
| otherwise = do
c0 <- readWord8Buf iraw ir
ow' <- writeCharBuf oraw ow (unsafeChr (fromIntegral c0))
loop (ir+1) ow'
-- lambda-lifted, to avoid thunks being built in the inner-loop:
done why !ir !ow = return (why,
if ir == iw then input{ bufL=0, bufR=0 }
else input{ bufL=ir },
output{ bufR=ow })
in
loop ir0 ow0
ascii_decode :: DecodeBuffer
ascii_decode
input@Buffer{ bufRaw=iraw, bufL=ir0, bufR=iw, bufSize=_ }
output@Buffer{ bufRaw=oraw, bufL=_, bufR=ow0, bufSize=os }
= let
loop !ir !ow
| ow >= os = done OutputUnderflow ir ow
| ir >= iw = done InputUnderflow ir ow
| otherwise = do
c0 <- readWord8Buf iraw ir
if c0 > 0x7f then invalid else do
ow' <- writeCharBuf oraw ow (unsafeChr (fromIntegral c0))
loop (ir+1) ow'
where
invalid = done InvalidSequence ir ow
-- lambda-lifted, to avoid thunks being built in the inner-loop:
done why !ir !ow = return (why,
if ir == iw then input{ bufL=0, bufR=0 }
else input{ bufL=ir },
output{ bufR=ow })
in
loop ir0 ow0
latin1_encode :: EncodeBuffer
latin1_encode
input@Buffer{ bufRaw=iraw, bufL=ir0, bufR=iw, bufSize=_ }
output@Buffer{ bufRaw=oraw, bufL=_, bufR=ow0, bufSize=os }
= let
done why !ir !ow = return (why,
if ir == iw then input{ bufL=0, bufR=0 }
else input{ bufL=ir },
output{ bufR=ow })
loop !ir !ow
| ow >= os = done OutputUnderflow ir ow
| ir >= iw = done InputUnderflow ir ow
| otherwise = do
(c,ir') <- readCharBuf iraw ir
writeWord8Buf oraw ow (fromIntegral (ord c))
loop ir' (ow+1)
in
loop ir0 ow0
latin1_checked_encode :: EncodeBuffer
latin1_checked_encode input output
= single_byte_checked_encode 0xff input output
ascii_encode :: EncodeBuffer
ascii_encode input output
= single_byte_checked_encode 0x7f input output
single_byte_checked_encode :: Int -> EncodeBuffer
single_byte_checked_encode max_legal_char
input@Buffer{ bufRaw=iraw, bufL=ir0, bufR=iw, bufSize=_ }
output@Buffer{ bufRaw=oraw, bufL=_, bufR=ow0, bufSize=os }
= let
done why !ir !ow = return (why,
if ir == iw then input{ bufL=0, bufR=0 }
else input{ bufL=ir },
output{ bufR=ow })
loop !ir !ow
| ow >= os = done OutputUnderflow ir ow
| ir >= iw = done InputUnderflow ir ow
| otherwise = do
(c,ir') <- readCharBuf iraw ir
if ord c > max_legal_char then invalid else do
writeWord8Buf oraw ow (fromIntegral (ord c))
loop ir' (ow+1)
where
invalid = done InvalidSequence ir ow
in
loop ir0 ow0
{-# INLINE single_byte_checked_encode #-}
|
