haskellattoparsec

Skipping whitespace excluding newlines in attoparsec

Attoparsec provides the function skipSpace.

This function consumes all whitespace available.

How can I implement a function skipSpaceNoNewline that skips any whitespace except \n and \r\n?

Note: This question intentionally shows no research effort as it was answered Q&A-Style.

Solution

  • You can combine skipWhile and isEndOfLine (which matches both \n and \r\n).

    Using a lambda function, you can combine them to a skipWhile predicate that skips any whitespace except newlines.

    skipSpaceNoNewline = skipWhile (\x -> isSpace_w8 x && not (isEndOfLine x))