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advent-of-code/2016/rust/src/day_07.rs

114 lines
2.7 KiB

use errors::*;
pub fn solve(input: &str) -> Result<String> {
Ok(input.lines()
.map(|x| IP7::new(x))
.filter(IP7::supports_ssl)
.count()
.to_string())
}
pub struct IP7 {
supernets: Vec<String>,
hypernets: Vec<String>,
}
impl IP7 {
fn new(s: &str) -> Self {
let mut current = String::new();
let mut supernets = Vec::new();
let mut hypernets = Vec::new();
for c in s.chars() {
match c {
'[' => {
supernets.push(current);
current = String::new();
}
']' => {
hypernets.push(current);
current = String::new();
}
c => current.push(c),
}
}
supernets.push(current);
IP7 {
supernets: supernets,
hypernets: hypernets,
}
}
pub fn supports_tls(&self) -> bool {
self.supernets.iter().any(|x| Self::abba(x)) &&
self.hypernets.iter().all(|x| !Self::abba(x))
}
fn supports_ssl(&self) -> bool {
let abas: Vec<String> =
self.supernets.iter().flat_map(|x| {
Self::abas(x).iter().map(|aba| {
let mut c = aba.chars();
let a = c.next().unwrap();
let b = c.next().unwrap();
format!("{}{}{}", b, a, b)
}).collect::<Vec<_>>()
}).collect();
self.hypernets.iter().any(|x| abas.iter().any(|y| x.contains(y)))
}
fn abba(s: &str) -> bool {
let v: Vec<_> = s.chars().collect();
v.windows(4).any(|w| (w[0] != w[1]) && (w[0] == w[3]) && (w[1] == w[2]))
}
fn abas(s: &str) -> Vec<String> {
let v: Vec<_> = s.chars().collect();
v.windows(3)
.filter(|w| (w[0] != w[1]) && (w[0] == w[2]))
.map(|w| w.iter().cloned().collect())
.collect()
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_new() {
let ip = IP7::new("abba[mnop]qrst");
assert_eq!(ip.supernets, vec!["abba".to_string(), "qrst".to_string()]);
assert_eq!(ip.hypernets, vec!["mnop".to_string()]);
}
#[test]
fn test_abba() {
assert!(IP7::abba("abba"));
assert!(!IP7::abba("abcd"));
}
#[test]
fn test_supports_tls() {
assert_eq!(IP7::new("abba[mnop]qrst").supports_tls(), true);
assert_eq!(IP7::new("abcd[bddb]xyyx").supports_tls(), false);
assert_eq!(IP7::new("aaaa[qwer]tyui").supports_tls(), false);
assert_eq!(IP7::new("ioxxoj[asdfgh]zxcvbn").supports_tls(), true);
}
#[test]
fn test_abas() {
assert_eq!(IP7::abas("zazbz"),
vec!["zaz".to_string(), "zbz".to_string()]);
}
#[test]
fn test_supports_ssl() {
assert!(IP7::new("aba[bab]xyz").supports_ssl());
assert!(!IP7::new("xyx[xyx]xyx").supports_ssl());
assert!(IP7::new("aaa[kek]eke").supports_ssl());
assert!(IP7::new("zazbz[bzb]cdb").supports_ssl());
}
}