Data.Attoparsec.FastSet

Fast set membership tests for Word8 and 8-bit Char values. The set representation is unboxed for efficiency. For sets of fewer than 32 elements, we test for membership using a binary search. For larger sets, we use a lookup table.

Data type

data FastSet

Instances

Eq FastSet

Ord FastSet

Show FastSet

Construction

fromList :: [Word8] -> FastSet

set :: ByteString -> FastSet

Create a set.

Lookup

memberChar :: Char -> FastSet -> Bool

Check the set for membership. Only works with 8-bit characters: characters above code point 255 will give wrong answers.

memberWord8 :: Word8 -> FastSet -> Bool

Check the set for membership.

Debugging

fromSet :: FastSet -> ByteString

Handy interface

charClass :: String -> FastSet