Function parse_nanos

arrow-cast/src/parse.rs:32–37

(digits: &[u8])

/// Parse nanoseconds from the first `N` values in digits, subtracting the offset `O`
#[inline]
fn parse_nanos<const N: usize, const O: u8>(digits: &[u8]) -> u32 {
    digits[..N]
        .iter()
        .fold(0_u32, |acc, v| acc * 10 + v.wrapping_sub(O) as u32)
        * 10_u32.pow((9 - N) as _)
}

/// Helper for parsing RFC3339 timestamps
struct TimestampParser {