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Haskell: mkTextEncoding: Handling illegal characters

‘mkTextEncoding’ takes a string and convert it into IO TextEncoding.

Prelude System.IO> :t mkTextEncoding
mkTextEncoding :: String -> IO TextEncoding

import System.IO

main =
putStrLn "Enter file name (Including full path) to write"
fileName getLine
fileHandle Openfile Filename WriteMode
endocoding mkTextEncoding "UTF-32LE"
hSetEncoding fileHandle endocoding

hPutStrLn fileHandle "我愛PTR"

hClose fileHandle

fileHandle openFile fileName ReadMode
hSetEncoding fileHandle endocoding
info hGetContents fileHandle

putStrLn info

$ runghc FileUtil.hs
Enter file name (Including full path) to write

When you open ‘temp.txt’ file in editor, you can see following information.

1162 0000 1b61 0000 5000 0000 5400 0000
5200 0000 0a00 0000

mkTextEncoding provides special notation to handle Illegal characters.

Ignores all illegal input sequences. e.g. UTF-8//IGNORE, will cause all Illegal Sequences on input to be ignored, and on output will drop all Code Points that have no representation in the target encoding.
Choose a replacement character for illegal sequences or code points.
Will use a PEP383-style escape mechanism to represent any invalid bytes in the input as Unicode codepoints. Upon output, these special codepoints are detected and turned back into the corresponding original byte.

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Haskell: mkTextEncoding: Handling illegal characters


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