Method capitalize

crates/vm/src/builtins/str.rs:731–763

(&self)

    #[pymethod]
    fn capitalize(&self) -> Wtf8Buf {
        match self.as_str_kind() {
            PyKindStr::Ascii(s) => {
                let mut s = s.to_owned();
                if let [first, rest @ ..] = s.as_mut_slice() {
                    first.make_ascii_uppercase();
                    ascii::AsciiStr::make_ascii_lowercase(rest.into());
                }
                s.into()
            }
            PyKindStr::Utf8(s) => {
                let mut chars = s.chars();
                let mut out = String::with_capacity(s.len());
                if let Some(c) = chars.next() {
                    out.extend(c.to_titlecase());
                    out.push_str(&chars.as_str().to_lowercase());
                }
                out.into()
            }
            PyKindStr::Wtf8(s) => {
                let mut out = Wtf8Buf::with_capacity(s.len());
                let mut chars = s.code_points();
                if let Some(ch) = chars.next() {
                    match ch.to_char() {
                        Some(ch) => out.extend(ch.to_titlecase()),
                        None => out.push(ch),
                    }
                    out.push_wtf8(&chars.as_wtf8().to_lowercase());
                }
                out
            }
        }
    }

    #[pymethod]
    fn split(zelf: &Py<Self>, args: SplitArgs, vm: &VirtualMachine) -> PyResult<Vec<PyObjectRef>> {