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use std::io::{BufRead};
pub fn ascii_to_u64(s: & [u8]) -> u64 {
#[cfg(debug_assertions)]
{
assert!(s.into_iter().all(|& c| c.is_ascii_digit()), "Not an ASCII base-10 number");
}
// SAFETY: AoC is ASCII-only.
unsafe { std::str::from_utf8_unchecked(s) }.parse().unwrap()
}
pub fn is_all_ascii_ws<'a, I: IntoIterator<Item = &'a u8>>(s: I) -> bool {
s.into_iter().all(|& c| c.is_ascii_whitespace())
}
pub fn read_helper<'a, 'b, R: BufRead>(r: &'a mut R, buf: &'b mut Vec<u8>, token: u8) -> std::io::Result<usize> {
buf.clear();
let num_bytes = r.read_until(token, buf)?;
if buf.last() == Some(& token) { buf.pop(); }
Ok(num_bytes)
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub enum Direction {
L, R
}
impl TryFrom<u8> for Direction {
type Error = &'static str;
fn try_from(c: u8) -> Result<Self, Self::Error> {
match c {
b'L' => Ok(Self::L),
b'R' => Ok(Self::R),
_ => Err("ASCII character not a valid direction")
}
}
}
pub type Node = [u8; 3];
#[cfg(test)]
mod tests {
use super::*;
}
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