108 lines
3.9 KiB
Haskell
108 lines
3.9 KiB
Haskell
{-# LANGUAGE ExistentialQuantification #-}
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module Data.Encoding
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(Encoding(..)
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,EncodingException(..)
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,DecodingException(..)
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,recode
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,recodeLazy
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,DynEncoding()
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,encodingFromString
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)
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where
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import Data.ByteString (ByteString)
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import qualified Data.ByteString.Lazy as Lazy (ByteString)
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import Data.Typeable
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import Data.Encoding.Base
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import Data.Encoding.ASCII
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import Data.Encoding.UTF8
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import Data.Encoding.UTF16
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import Data.Encoding.UTF32
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import Data.Encoding.ISO88591
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import Data.Encoding.ISO88592
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import Data.Encoding.ISO88593
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import Data.Encoding.ISO88594
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import Data.Encoding.ISO88595
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import Data.Encoding.ISO88596
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import Data.Encoding.ISO88597
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import Data.Encoding.ISO88598
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import Data.Encoding.ISO88599
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import Data.Encoding.ISO885910
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import Data.Encoding.ISO885911
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import Data.Encoding.ISO885913
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import Data.Encoding.ISO885914
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import Data.Encoding.ISO885915
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import Data.Encoding.ISO885916
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import Data.Encoding.CP1250
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import Data.Encoding.CP1251
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import Data.Encoding.CP1252
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import Data.Encoding.CP1253
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import Data.Encoding.CP1254
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import Data.Encoding.CP1255
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import Data.Encoding.CP1256
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import Data.Encoding.CP1257
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import Data.Encoding.CP1258
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import Data.Encoding.KOI8R
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import Data.Encoding.GB18030
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-- | An untyped encoding. Used in 'System.IO.Encoding.getSystemEncoding'.
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data DynEncoding = forall t. (Encoding t,Show t,Typeable t,Eq t)
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=> DynEncoding t
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instance Encoding DynEncoding where
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encode (DynEncoding enc) = encode enc
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encodeLazy (DynEncoding enc) = encodeLazy enc
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encodable (DynEncoding enc) = encodable enc
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decode (DynEncoding enc) = decode enc
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decodeLazy (DynEncoding enc) = decodeLazy enc
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decodable (DynEncoding enc) = decodable enc
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instance Show DynEncoding where
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show (DynEncoding enc) = "DynEncoding "++show enc
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instance Eq DynEncoding where
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(DynEncoding enc1) == (DynEncoding enc2) = case cast enc2 of
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Nothing -> False
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Just renc2 -> enc1 == renc2
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-- | This decodes a string from one encoding and encodes it into another.
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recode :: (Encoding from,Encoding to) => from -> to -> ByteString -> ByteString
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recode enc_f enc_t bs = encode enc_t (decode enc_f bs)
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recodeLazy :: (Encoding from,Encoding to) => from -> to -> Lazy.ByteString -> Lazy.ByteString
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recodeLazy enc_f enc_t bs = encodeLazy enc_t (decodeLazy enc_f bs)
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-- | Takes the name of an encoding and creates a dynamic encoding from it.
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encodingFromString :: String -> DynEncoding
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encodingFromString "ASCII" = DynEncoding ASCII
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encodingFromString "UTF-8" = DynEncoding UTF8
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encodingFromString "UTF-16" = DynEncoding UTF16
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encodingFromString "UTF-32" = DynEncoding UTF32
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encodingFromString "KOI8-R" = DynEncoding KOI8R
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encodingFromString "ISO-8859-1" = DynEncoding ISO88591
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encodingFromString "ISO-8859-2" = DynEncoding ISO88592
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encodingFromString "ISO-8859-3" = DynEncoding ISO88593
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encodingFromString "ISO-8859-4" = DynEncoding ISO88594
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encodingFromString "ISO-8859-5" = DynEncoding ISO88595
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encodingFromString "ISO-8859-6" = DynEncoding ISO88596
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encodingFromString "ISO-8859-7" = DynEncoding ISO88597
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encodingFromString "ISO-8859-8" = DynEncoding ISO88598
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encodingFromString "ISO-8859-9" = DynEncoding ISO88599
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encodingFromString "ISO-8859-10"= DynEncoding ISO885910
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encodingFromString "ISO-8859-11"= DynEncoding ISO885911
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encodingFromString "ISO-8859-13"= DynEncoding ISO885913
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encodingFromString "ISO-8859-14"= DynEncoding ISO885914
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encodingFromString "ISO-8859-15"= DynEncoding ISO885915
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encodingFromString "ISO-8859-16"= DynEncoding ISO885916
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encodingFromString "CP1250" = DynEncoding CP1250
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encodingFromString "CP1251" = DynEncoding CP1251
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encodingFromString "CP1252" = DynEncoding CP1252
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encodingFromString "CP1253" = DynEncoding CP1253
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encodingFromString "CP1254" = DynEncoding CP1254
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encodingFromString "CP1255" = DynEncoding CP1255
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encodingFromString "CP1256" = DynEncoding CP1256
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encodingFromString "CP1257" = DynEncoding CP1257
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encodingFromString "CP1258" = DynEncoding CP1258
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encodingFromString "GB18030" = DynEncoding GB18030
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encodingFromString str = error $ "Unknown encoding: "++show str
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