Difference between revisions of "UTF-8"
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(whoops, reuse the same example, why don't we) |
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[[Category:Code]] |
[[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 |
+ | 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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| + | == Example == |
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| + | This example reverses every line in a file (saving the results in the file + ".rev") |
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| + | |||
| − | do putStrLn "what is your name? " |
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| + | If we use a function from <code>System.IO.UTF8</code>, we should also hide the equivalent one from the Prelude. (Alternatively, we could import the UTF8 module qualified) |
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| − | name <- getContents |
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| + | |||
| − | putStrLn $ "hello, " ++ name ++ "!" |
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</haskell> |
</haskell> |
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| + | |||
| + | <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 f <- readFile f |
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| + | > writeFile (f ++ ".rev) $ reverseLines f |
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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 09:28, 21 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
Example
This example reverses every line in a file (saving the results in the file + ".rev")
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)
> main :: IO ()
> main =
> do args <- getArgs
> mapM_ reverseUTF8File args
> reverseUTF8File :: FilePath -> IO ()
> reverseUTF8File f =
> do f <- readFile f
> writeFile (f ++ ".rev) $ reverseLines f
> where
> reverseLines = unlines . map reverse . lines
<haskell>