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|
Various Unicode-related utilities.
\begin{code}
module UnicodeUtil(
stringToUtf8, intsToUtf8
) where
#include "HsVersions.h"
import Panic ( panic )
import Char ( chr, ord )
\end{code}
\begin{code}
stringToUtf8 :: String -> String
stringToUtf8 s = intsToUtf8 (map ord s)
intsToUtf8 :: [Int] -> String
intsToUtf8 [] = ""
intsToUtf8 (c:s)
| c >= 1 && c <= 0x7F = chr c : intsToUtf8 s
| c < 0 = panic ("charToUtf8 ("++show c++")")
| c <= 0x7FF = chr (0xC0 + c `div` 0x40 ) :
chr (0x80 + c `mod` 0x40) :
intsToUtf8 s
| c <= 0xFFFF = chr (0xE0 + c `div` 0x1000 ) :
chr (0x80 + c `div` 0x40 `mod` 0x40) :
chr (0x80 + c `mod` 0x40) :
intsToUtf8 s
| c <= 0x10FFFF = chr (0xF0 + c `div` 0x40000 ) :
chr (0x80 + c `div` 0x1000 `mod` 0x40) :
chr (0x80 + c `div` 0x40 `mod` 0x40) :
chr (0x80 + c `mod` 0x40) :
intsToUtf8 s
| otherwise = panic ("charToUtf8 "++show c)
\end{code}
|
