Difference between revisions of "UTF-8"
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(question - what about other string encodings?) |
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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 |
+ | 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 |
| + | 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.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> |
<haskell> |
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| + | > main :: IO () |
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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 putStrLn "what is your name? " |
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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> |
</haskell> |
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Revision as of 02:22, 22 July 2008
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