filter

Overview ¶

Package filter implements a transform.Transformer that performs the Unicode code point filtering preprocessing step defined in CSS Syntax Module Level 3, section 3.3:

"To filter code points from a stream of (unfiltered) code points input:

"Replace any U+000D CARRIAGE RETURN (CR) code points, U+000C FORM FEED (FF) code points, or pairs of U+000D CARRIAGE RETURN (CR) followed by U+000A LINE FEED (LF) in input by a single U+000A LINE FEED (LF) code point.

"Replace any U+0000 NULL or surrogate code points in input with U+FFFD REPLACEMENT CHARACTER (�)."