Function html5ever::tendril::encoding_rs::mem::is_utf8_bidi

pub fn is_utf8_bidi(buffer: &[u8]) -> bool

Checks whether a potentially-invalid UTF-8 buffer contains code points that trigger right-to-left processing.

The check is done on a Unicode block basis without regard to assigned vs. unassigned code points in the block. Hebrew presentation forms in the Alphabetic Presentation Forms block are treated as if they formed a block on their own (i.e. it treated as right-to-left). Additionally, the four RIGHT-TO-LEFT FOO controls in General Punctuation are checked for. Control characters that are technically bidi controls but do not cause right-to-left behavior without the presence of right-to-left characters or right-to-left controls are not checked for. As a special case, U+FEFF is excluded from Arabic Presentation Forms-B.

Returns true if the input is invalid UTF-8 or the input contains an RTL character. Returns false if the input is valid UTF-8 and contains no RTL characters.