Difference between revisions of "UTF-8"

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[[Category:Code]]
  
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The simplest solution seems to be to use the [http://hackage.haskell.org/cgi-bin/hackage-scripts/package/utf8-string utf8-string package] from Galois.  It
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provides a drop-in replacement for System.IO
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''What about other string encodings?''
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== Example ==
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If we use a function from System.IO.UTF8, we should also hide the equivalent one from the Prelude. (Alternatively, we could import the UTF8 module qualified)
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<haskell>
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> import System.IO.UTF8
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> import Prelude hiding (readFile, writeFile)
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> import System.Environment (getArgs)
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</haskell>
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The readFile and writeFile functions are the same as before...
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<haskell>
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> main :: IO ()
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> main =
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>  do args <- getArgs
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>    mapM_ reverseUTF8File args
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> reverseUTF8File :: FilePath -> IO ()
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> reverseUTF8File f =
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>  do c <- readFile f
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>      writeFile (f ++ ".rev") $ reverseLines c
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>  where
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>    reverseLines = unlines . map reverse . lines
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</haskell>

Latest revision as of 15:20, 6 February 2021


The simplest solution seems to be to use the utf8-string package from Galois. It provides a drop-in replacement for System.IO

What about other string encodings?

Example

If we use a function from System.IO.UTF8, we should also hide the equivalent one from the Prelude. (Alternatively, we could import the UTF8 module qualified)

> import System.IO.UTF8
> import Prelude hiding (readFile, writeFile)
> import System.Environment (getArgs)

The readFile and writeFile functions are the same as before...

> main :: IO ()
> main =
>  do args <- getArgs
>     mapM_ reverseUTF8File args

> reverseUTF8File :: FilePath -> IO ()
> reverseUTF8File f =
>   do c <- readFile f
>      writeFile (f ++ ".rev") $ reverseLines c
>   where
>     reverseLines = unlines . map reverse . lines