fn split_prefix()

in src/util.rs [579:611]

• 29 lines of code
• 6 McCabe index (conditional complexity)

    fn split_prefix(&self, s: &str) -> Option<OsString> {
        // See comments in the above implementation for what's going on here
        let mut u16s = self.encode_wide().peekable();
        let mut utf8 = s.chars();

        while let Some(&codepoint) = u16s.peek() {
            let to_match = match utf8.next() {
                Some(ch) => ch,
                None => {
                    let codepoints = u16s.collect::<Vec<_>>();
                    return Some(OsString::from_wide(&codepoints));
                }
            };

            let to_match = to_match as u32;
            let codepoint = codepoint as u32;

            if to_match < 0xd7ff {
                if to_match != codepoint {
                    return None;
                }
            } else {
                return None;
            }
            u16s.next();
        }

        if utf8.next().is_none() {
            Some(OsString::new())
        } else {
            None
        }
    }