Function parse_number

crates/common/src/format.rs:258–269

(text: &Wtf8)

}

fn parse_number(text: &Wtf8) -> Result<(Option<usize>, &Wtf8), FormatSpecError> {
    let num_digits: usize = get_num_digits(text);
    if num_digits == 0 {
        return Ok((None, text));
    }
    if let Some(num) = parse_usize(&text[..num_digits]) {
        Ok((Some(num), &text[num_digits..]))
    } else {
        // NOTE: this condition is different from CPython
        Err(FormatSpecError::DecimalDigitsTooMany)
    }
}

fn parse_alternate_form(text: &Wtf8) -> (bool, &Wtf8) {
    let mut chars = text.code_points();