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extern crate advent_of_code_2017;
use advent_of_code_2017::*;
use std::str::FromStr;
use std::collections::HashMap;
use std::sync::mpsc::*;
fn main() {
let args = AdventArgs::init();
let instructions: Vec<Instruction> = args.input.iter()
.map(|line| line.parse().unwrap())
.collect();
let (sender0, receiver0) = channel();
let (sender1, receiver1) = channel();
let mut program0 = Program::new(0, instructions.clone(), sender0, receiver1, args.part == 1);
if args.part == 1 {
program0.run();
let mut answer = 0;
while let Ok(x) = receiver0.try_recv() {
answer = x;
}
println!("Last sent value: {}", answer);
} else {
let mut program1 = Program::new(1, instructions.clone(), sender1, receiver0, args.part == 1);
while !(program0.terminated && program1.terminated) && (program0.run() || program1.run()) {
}
println!("Program 0 sent {} messages", program0.sent_count);
println!("Program 1 sent {} messages", program1.sent_count);
}
}
struct Program {
instructions: Vec<Instruction>,
registers: HashMap<char, i64>,
pc: i64,
terminated: bool,
sender: Sender<i64>,
sent_count: u64,
receiver: Receiver<i64>,
part1: bool
}
impl Program {
fn new(process_id: i64, instructions: Vec<Instruction>, sender: Sender<i64>, receiver: Receiver<i64>, part1: bool) -> Program {
let mut reg = HashMap::new();
if !part1 {
reg.insert('p', process_id);
}
Program {
instructions: instructions,
registers: reg,
pc: 0,
terminated: false,
sender: sender,
sent_count: 0,
receiver: receiver,
part1: part1
}
}
fn run(&mut self) -> bool {
use Instruction::*;
let mut blocked = false;
let mut did_something = false;
while !blocked && !self.terminated {
if self.pc < 0 || self.pc as usize >= self.instructions.len() {
self.terminated = true;
}
else {
let ins = self.instructions[self.pc as usize].clone();
match ins {
Snd(x) => {
self.sent_count += 1;
self.sender.send(self.get(x)).ok();
},
Set(x, y) => {
let y_val = self.get(y);
self.set(x, y_val);
},
Add(x, y) => {
let x_val = self.get(x);
let y_val = self.get(y);
self.set(x, x_val + y_val);
},
Mul(x, y) => {
let x_val = self.get(x);
let y_val = self.get(y);
self.set(x, x_val * y_val);
},
Mod(x, y) => {
let x_val = self.get(x);
let y_val = self.get(y);
self.set(x, x_val % y_val);
},
Rcv(x) => {
if self.part1 {
blocked = self.get(x) != 0;
} else {
match self.receiver.try_recv() {
Ok(y) => {
self.set(x, y);
},
Err(_) => {
blocked = true;
return did_something;
}
}
}
},
Jgz(x, y) => {
if self.get(x) > 0 {
self.pc = self.pc + self.get(y) - 1;
}
},
}
self.pc += 1;
did_something = true;
}
}
true
}
fn get(&self, register: Data) -> i64 {
use Data::*;
match register {
Register(c) => self.registers.get(&c).cloned().unwrap_or(0),
Literal(i) => i
}
}
fn set(&mut self, register: Data, value: i64) {
use Data::*;
match register {
Register(c) => {
self.registers.insert(c, value);
},
_ => {}
}
}
}
#[derive(Debug, Clone)]
enum Instruction {
Snd(Data),
Set(Data, Data),
Add(Data, Data),
Mul(Data, Data),
Mod(Data, Data),
Rcv(Data),
Jgz(Data, Data)
}
impl FromStr for Instruction {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
use Instruction::*;
let mut str_iter = s.split_whitespace();
let ins = str_iter.next();
let x = str_iter.next().map(|x| x.parse::<Data>());
let y = str_iter.next().map(|x| x.parse::<Data>());
match (ins, x, y) {
(Some("snd"), Some(Ok(x)), _) => Ok(Snd(x)),
(Some("set"), Some(Ok(x)), Some(Ok(y))) => Ok(Set(x, y)),
(Some("add"), Some(Ok(x)), Some(Ok(y))) => Ok(Add(x, y)),
(Some("mul"), Some(Ok(x)), Some(Ok(y))) => Ok(Mul(x, y)),
(Some("mod"), Some(Ok(x)), Some(Ok(y))) => Ok(Mod(x, y)),
(Some("rcv"), Some(Ok(x)), _) => Ok(Rcv(x)),
(Some("jgz"), Some(Ok(x)), Some(Ok(y))) => Ok(Jgz(x, y)),
(_, _, _) => Err(format!("Unknown instruction {}", s))
}
}
}
#[derive(Debug, Clone, Copy)]
enum Data {
Literal(i64),
Register(char)
}
impl FromStr for Data {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
use Data::*;
match (s.parse(), s.chars().next()) {
(Ok(num), _) => Ok(Literal(num)),
(Err(_), Some(c)) => Ok(Register(c)),
(_, _) => Err(format!("Invalid data {}", s))
}
}
}
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