forked from GitHub/gf-core
19 lines
613 B
Haskell
19 lines
613 B
Haskell
module URLEncoding where
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import Data.Bits (shiftL, (.|.))
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import Data.Char (chr,digitToInt,isHexDigit)
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urlDecodeUnicode :: String -> String
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urlDecodeUnicode [] = ""
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urlDecodeUnicode ('%':'u':x1:x2:x3:x4:s)
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| all isHexDigit [x1,x2,x3,x4] =
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chr ( digitToInt x1 `shiftL` 12
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.|. digitToInt x2 `shiftL` 8
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.|. digitToInt x3 `shiftL` 4
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.|. digitToInt x4) : urlDecodeUnicode s
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urlDecodeUnicode ('%':x1:x2:s) | isHexDigit x1 && isHexDigit x2 =
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chr ( digitToInt x1 `shiftL` 4
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.|. digitToInt x2) : urlDecodeUnicode s
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urlDecodeUnicode (c:s) = c : urlDecodeUnicode s
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