module Text.Regex.Do.Trim where
import Text.Regex.Do.Type.Do
import Data.Char(isSpace)
import qualified Data.ByteString as B
import Text.Regex.Do.Convert
import Text.Regex.Do.Pcre.Ascii.Replace
import Text.Regex.Do.Type.MatchHint
import Text.Regex.Do.Type.Regex
import Text.Regex.Do.Pcre.Option
class Trim a where
trim::a -> a
instance Trim B.ByteString where
trim bs1 = replace rx2 repl1 (All bs1)
where repl1 = Replacement B.empty
rx1 = "(^[\\s\\t]+)|([\\s\\t]+$)"
rx2 = let p1 = Pattern $ toByteString rx1
in makeRegexOpt p1 [Blank] []
instance Trim String where
trim = f . f
where f = reverse . dropWhile isSpace