year2015/
day08.rs

1use utils::prelude::*;
2
3/// Escape sequences.
4#[derive(Clone, Debug)]
5pub struct Day08<'a> {
6    input: &'a str,
7}
8
9impl<'a> Day08<'a> {
10    pub fn new(input: &'a str, _: InputType) -> Result<Self, InputError> {
11        Ok(Self { input })
12    }
13
14    #[must_use]
15    pub fn part1(&self) -> u32 {
16        self.input
17            .bytes()
18            .fold((false, 0), |(escaped, diff), b| match (escaped, b) {
19                (false, b'"') | (true, b'\\' | b'"') => (false, diff + 1),
20                (false, b'\\') => (true, diff),
21                (true, b'x') => (false, diff + 3),
22                _ => (false, diff),
23            })
24            .1
25    }
26
27    #[must_use]
28    pub fn part2(&self) -> u32 {
29        self.input
30            .bytes()
31            .fold((false, 0), |(escaped, diff), b| match (escaped, b) {
32                (false, b'"') => (false, diff + 2),
33                (false, b'\\') => (true, diff + 1),
34                (true, b'\\' | b'"') => (false, diff + 1),
35                _ => (false, diff),
36            })
37            .1
38    }
39}
40
41examples!(Day08<'_> -> (u32, u32) [
42    {file: "day08_example0.txt", part1: 12, part2: 19},
43]);
year2015/day08.rs

year2015/
day08.rs
